/mandos/trunk : revision 237.4.130

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* "browse_callback", and parts of "main".

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*

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* Everything else is

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*

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* This program is free software: you can redistribute it and/or

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* modify it under the terms of the GNU General Public License as

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* published by the Free Software Foundation, either version 3 of the

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* License, or (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful, but

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*

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* This file is part of Mandos.

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*

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* Mandos is free software: you can redistribute it and/or modify it

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* under the terms of the GNU General Public License as published by

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* the Free Software Foundation, either version 3 of the License, or

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* (at your option) any later version.

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*

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* Mandos is distributed in the hope that it will be useful, but

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* General Public License for more details.

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*

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* You should have received a copy of the GNU General Public License

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* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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*

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* Contact the authors at <mandos@fukt.bsnet.se>.

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* Contact the authors at <mandos@recompile.se>.

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*/

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/* Needed by GPGME, specifically gpgme_data_seek() */

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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#include <stdio.h> /* fprintf(), stderr, fwrite(),

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stdout, ferror(), remove() */

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#include <stdint.h> /* uint16_t, uint32_t */

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stdout, ferror() */

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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

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#include <stddef.h> /* NULL, size_t, ssize_t */

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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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strtof(), abort() */

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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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#include <string.h> /* strcmp(), strlen(), strerror(),

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asprintf(), strncpy(), strsignal()

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*/

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#include <sys/ioctl.h> /* ioctl */

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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#include <sys/stat.h> /* open() */

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#include <sys/stat.h> /* open(), S_ISREG */

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#include <sys/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect() */

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#include <fcntl.h> /* open() */

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inet_pton(), connect(),

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getnameinfo() */

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#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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*/

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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

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strtoimax() */

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#include <assert.h> /* assert() */

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#include <errno.h> /* perror(), errno */

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#include <time.h> /* nanosleep(), time() */

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#include <errno.h> /* perror(), errno, EINTR, EINVAL,

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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program_invocation_short_name */

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#include <time.h> /* nanosleep(), time(), sleep() */

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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

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getuid(), getgid(), seteuid(),

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setgid(), pause() */

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#include <arpa/inet.h> /* inet_pton(), htons */

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setgid(), pause(), _exit(),

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unlinkat() */

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#include <arpa/inet.h> /* inet_pton(), htons() */

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#include <iso646.h> /* not, or, and */

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#include <argp.h> /* struct argp_option, error_t, struct

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argp_state, struct argp,

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raise() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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WEXITSTATUS(), WTERMSIG() */

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#include <grp.h> /* setgroups() */

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#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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#include <sys/klog.h> /* klogctl() */

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gnutls_*

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init_gnutls_session(),

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GNUTLS_* */

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#if GNUTLS_VERSION_NUMBER < 0x030600

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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#elif GNUTLS_VERSION_NUMBER >= 0x030606

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#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,

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GNUTLS_PKCS_PLAIN,

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GNUTLS_PKCS_NULL_PASSWORD */

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#endif

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/* GPGME */

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#include <gpgme.h> /* All GPGME types, constants and

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#define PATHDIR "/conf/conf.d/mandos"

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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#define TLS_PRIVKEY "tls-privkey.pem"

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#define TLS_PUBKEY "tls-pubkey.pem"

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#define HOOKDIR "/lib/mandos/network-hooks.d"

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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const char *argp_program_version = "mandos-client " VERSION;

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

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const char *argp_program_bug_address = "<mandos@recompile.se>";

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static const char sys_class_net[] = "/sys/class/net";

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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/* Doubly linked list that need to be circularly linked when used */

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typedef struct server{

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const char *ip;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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/* Used for passing in values through the Avahi callback functions */

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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gnutls_dh_params_t dh_params;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global context so signal handler can reach it*/

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mandos_context mc = { .simple_poll = NULL, .server = NULL,

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP" };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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fprintf(stderr, "Mandos plugin %s: ",

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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__attribute__((format (gnu_printf, 2, 3), nonnull))

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int fprintf_plus(FILE *stream, const char *format, ...){

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va_list ap;

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va_start (ap, format);

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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

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program_invocation_short_name));

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return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

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}

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/*

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* Make additional room in "buffer" for at least BUFFER_SIZE more

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* bytes. "buffer_capacity" is how much is currently allocated,

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

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if(buffer == NULL){

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char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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/* Add server to set of servers to retry periodically */

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__attribute__((nonnull, warn_unused_result))

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bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

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int af, server **current_server){

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int ret;

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server *new_server = malloc(sizeof(server));

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if(new_server == NULL){

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perror_plus("malloc");

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return false;

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}

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*new_server = (server){ .ip = strdup(ip),

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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free(new_server);

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return false;

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}

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ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

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if(ret == -1){

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perror_plus("clock_gettime");

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#ifdef __GNUC__

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#pragma GCC diagnostic push

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#pragma GCC diagnostic ignored "-Wcast-qual"

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#endif

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free((char *)(new_server->ip));

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#ifdef __GNUC__

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#pragma GCC diagnostic pop

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#endif

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free(new_server);

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return false;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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} else {

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/* Place the new server last in the list */

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new_server->next = *current_server;

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new_server->prev = (*current_server)->prev;

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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/* Set effective uid to 0, return errno */

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__attribute__((warn_unused_result))

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int raise_privileges(void){

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int old_errno = errno;

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int ret = 0;

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if(seteuid(0) == -1){

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ret = errno;

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}

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errno = old_errno;

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return ret;

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}

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/* Set effective and real user ID to 0. Return errno. */

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__attribute__((warn_unused_result))

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int raise_privileges_permanently(void){

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int old_errno = errno;

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int ret = raise_privileges();

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if(ret != 0){

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errno = old_errno;

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return ret;

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}

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if(setuid(0) == -1){

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ret = errno;

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}

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errno = old_errno;

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return ret;

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}

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/* Set effective user ID to unprivileged saved user ID */

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__attribute__((warn_unused_result))

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int lower_privileges(void){

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int old_errno = errno;

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int ret = 0;

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if(seteuid(uid) == -1){

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ret = errno;

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}

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errno = old_errno;

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return ret;

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}

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/* Lower privileges permanently */

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__attribute__((warn_unused_result))

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int lower_privileges_permanently(void){

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int old_errno = errno;

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int ret = 0;

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if(setuid(uid) == -1){

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ret = errno;

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}

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errno = old_errno;

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return ret;

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}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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345

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/*

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* Helper function to insert pub and seckey to the engine keyring.

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*/

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bool import_key(const char *filename){

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bool import_key(const char * const filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

183

353

184

354

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

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if(fd == -1){

186

perror("open");

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perror_plus("open");

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return false;

188

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}

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/* Workaround for systems without a real-time clock; see also

361

Debian bug #894495: <https://bugs.debian.org/894495> */

362

do {

363

{

364

time_t currtime = time(NULL);

365

if(currtime != (time_t)-1){

366

struct tm tm;

367

if(gmtime_r(&currtime, &tm) == NULL) {

368

perror_plus("gmtime_r");

369

break;

370

}

371

if(tm.tm_year != 70 or tm.tm_mon != 0){

372

break;

373

}

374

if(debug){

375

fprintf_plus(stderr, "System clock is January 1970");

376

}

377

} else {

378

if(debug){

379

fprintf_plus(stderr, "System clock is invalid");

380

}

381

}

382

}

383

struct stat keystat;

384

ret = fstat(fd, &keystat);

385

if(ret != 0){

386

perror_plus("fstat");

387

break;

388

}

389

ret = raise_privileges();

390

if(ret != 0){

391

errno = ret;

392

perror_plus("Failed to raise privileges");

393

break;

394

}

395

if(debug){

396

fprintf_plus(stderr,

397

"Setting system clock to key file mtime");

398

}

399

time_t keytime = keystat.st_mtim.tv_sec;

400

if(stime(&keytime) != 0){

401

perror_plus("stime");

402

}

403

ret = lower_privileges();

404

if(ret != 0){

405

errno = ret;

406

perror_plus("Failed to lower privileges");

407

}

408

} while(false);

409

190

410

rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

411

if(rc != GPG_ERR_NO_ERROR){

192

fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

193

gpgme_strsource(rc), gpgme_strerror(rc));

412

fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

194

414

return false;

195

415

}

196

416

197

rc = gpgme_op_import(mc.ctx, pgp_data);

417

rc = gpgme_op_import(mc->ctx, pgp_data);

198

418

if(rc != GPG_ERR_NO_ERROR){

199

fprintf(stderr, "bad gpgme_op_import: %s: %s\n",

200

gpgme_strsource(rc), gpgme_strerror(rc));

419

fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",

420

gpgme_strsource(rc), gpgme_strerror(rc));

201

421

return false;

202

422

}

423

{

424

gpgme_import_result_t import_result

425

= gpgme_op_import_result(mc->ctx);

426

if((import_result->imported < 1

427

or import_result->not_imported > 0)

428

and import_result->unchanged == 0){

429

fprintf_plus(stderr, "bad gpgme_op_import_results:\n");

430

fprintf_plus(stderr,

431

"The total number of considered keys: %d\n",

432

import_result->considered);

433

fprintf_plus(stderr,

434

"The number of keys without user ID: %d\n",

435

import_result->no_user_id);

436

fprintf_plus(stderr,

437

"The total number of imported keys: %d\n",

438

import_result->imported);

439

fprintf_plus(stderr, "The number of imported RSA keys: %d\n",

440

import_result->imported_rsa);

441

fprintf_plus(stderr, "The number of unchanged keys: %d\n",

442

import_result->unchanged);

443

fprintf_plus(stderr, "The number of new user IDs: %d\n",

444

import_result->new_user_ids);

445

fprintf_plus(stderr, "The number of new sub keys: %d\n",

446

import_result->new_sub_keys);

447

fprintf_plus(stderr, "The number of new signatures: %d\n",

448

import_result->new_signatures);

449

fprintf_plus(stderr, "The number of new revocations: %d\n",

450

import_result->new_revocations);

451

fprintf_plus(stderr,

452

"The total number of secret keys read: %d\n",

453

import_result->secret_read);

454

fprintf_plus(stderr,

455

"The number of imported secret keys: %d\n",

456

import_result->secret_imported);

457

fprintf_plus(stderr,

458

"The number of unchanged secret keys: %d\n",

459

import_result->secret_unchanged);

460

fprintf_plus(stderr, "The number of keys not imported: %d\n",

461

import_result->not_imported);

462

for(gpgme_import_status_t import_status

463

= import_result->imports;

464

import_status != NULL;

465

import_status = import_status->next){

466

fprintf_plus(stderr, "Import status for key: %s\n",

467

import_status->fpr);

468

if(import_status->result != GPG_ERR_NO_ERROR){

469

fprintf_plus(stderr, "Import result: %s: %s\n",

470

gpgme_strsource(import_status->result),

471

gpgme_strerror(import_status->result));

472

}

473

fprintf_plus(stderr, "Key status:\n");

474

fprintf_plus(stderr,

475

import_status->status & GPGME_IMPORT_NEW

476

? "The key was new.\n"

477

: "The key was not new.\n");

478

fprintf_plus(stderr,

479

import_status->status & GPGME_IMPORT_UID

480

? "The key contained new user IDs.\n"

481

: "The key did not contain new user IDs.\n");

482

fprintf_plus(stderr,

483

import_status->status & GPGME_IMPORT_SIG

484

? "The key contained new signatures.\n"

485

: "The key did not contain new signatures.\n");

486

fprintf_plus(stderr,

487

import_status->status & GPGME_IMPORT_SUBKEY

488

? "The key contained new sub keys.\n"

489

: "The key did not contain new sub keys.\n");

490

fprintf_plus(stderr,

491

import_status->status & GPGME_IMPORT_SECRET

492

? "The key contained a secret key.\n"

493

: "The key did not contain a secret key.\n");

494

}

495

return false;

496

}

497

}

203

498

204

ret = (int)TEMP_FAILURE_RETRY(close(fd));

499

ret = close(fd);

205

500

if(ret == -1){

206

perror("close");

501

perror_plus("close");

207

502

}

208

503

gpgme_data_release(pgp_data);

209

504

return true;

210

505

}

211

506

212

507

if(debug){

213

fprintf(stderr, "Initializing GPGME\n");

508

fprintf_plus(stderr, "Initializing GPGME\n");

214

509

}

215

510

216

511

/* Init GPGME */

217

512

gpgme_check_version(NULL);

218

513

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

514

if(rc != GPG_ERR_NO_ERROR){

220

fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",

221

gpgme_strsource(rc), gpgme_strerror(rc));

515

fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",

516

gpgme_strsource(rc), gpgme_strerror(rc));

222

517

return false;

223

518

}

224

519

225

/* Set GPGME home directory for the OpenPGP engine only */

520

/* Set GPGME home directory for the OpenPGP engine only */

226

521

rc = gpgme_get_engine_info(&engine_info);

227

522

if(rc != GPG_ERR_NO_ERROR){

228

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

229

gpgme_strsource(rc), gpgme_strerror(rc));

523

fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",

524

gpgme_strsource(rc), gpgme_strerror(rc));

230

525

return false;

231

526

}

232

527

while(engine_info != NULL){

238

533

engine_info = engine_info->next;

239

534

}

240

535

if(engine_info == NULL){

241

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

536

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

537

tempdir);

242

538

return false;

243

539

}

244

540

245

541

/* Create new GPGME "context" */

246

rc = gpgme_new(&(mc.ctx));

542

rc = gpgme_new(&(mc->ctx));

247

543

if(rc != GPG_ERR_NO_ERROR){

248

fprintf(stderr, "bad gpgme_new: %s: %s\n",

249

gpgme_strsource(rc), gpgme_strerror(rc));

544

fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",

545

gpgme_strsource(rc), gpgme_strerror(rc));

250

546

return false;

251

547

}

252

548

261

557

* Decrypt OpenPGP data.

262

558

* Returns -1 on error

263

559

*/

560

__attribute__((nonnull, warn_unused_result))

264

561

static ssize_t pgp_packet_decrypt(const char *cryptotext,

265

562

size_t crypto_size,

266

char **plaintext){

563

char **plaintext,

564

mandos_context *mc){

267

565

gpgme_data_t dh_crypto, dh_plain;

268

566

gpgme_error_t rc;

269

567

ssize_t ret;

271

569

ssize_t plaintext_length = 0;

272

570

273

571

if(debug){

274

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

572

fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");

275

573

}

276

574

277

575

/* Create new GPGME data buffer from memory cryptotext */

278

576

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

577

0);

280

578

if(rc != GPG_ERR_NO_ERROR){

281

fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

282

gpgme_strsource(rc), gpgme_strerror(rc));

579

fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

580

gpgme_strsource(rc), gpgme_strerror(rc));

283

581

return -1;

284

582

}

285

583

286

584

/* Create new empty GPGME data buffer for the plaintext */

287

585

rc = gpgme_data_new(&dh_plain);

288

586

if(rc != GPG_ERR_NO_ERROR){

289

fprintf(stderr, "bad gpgme_data_new: %s: %s\n",

290

gpgme_strsource(rc), gpgme_strerror(rc));

587

fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",

588

gpgme_strsource(rc), gpgme_strerror(rc));

291

589

gpgme_data_release(dh_crypto);

292

590

return -1;

293

591

}

294

592

295

593

/* Decrypt data from the cryptotext data buffer to the plaintext

296

594

data buffer */

297

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

595

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

298

596

if(rc != GPG_ERR_NO_ERROR){

299

fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",

300

gpgme_strsource(rc), gpgme_strerror(rc));

597

fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",

598

gpgme_strsource(rc), gpgme_strerror(rc));

301

599

plaintext_length = -1;

302

600

if(debug){

303

601

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

602

result = gpgme_op_decrypt_result(mc->ctx);

305

603

if(result == NULL){

306

fprintf(stderr, "gpgme_op_decrypt_result failed\n");

604

fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");

307

605

} else {

308

fprintf(stderr, "Unsupported algorithm: %s\n",

309

result->unsupported_algorithm);

310

fprintf(stderr, "Wrong key usage: %u\n",

311

result->wrong_key_usage);

606

if(result->unsupported_algorithm != NULL) {

607

fprintf_plus(stderr, "Unsupported algorithm: %s\n",

608

result->unsupported_algorithm);

609

}

610

fprintf_plus(stderr, "Wrong key usage: %s\n",

611

result->wrong_key_usage ? "Yes" : "No");

312

612

if(result->file_name != NULL){

313

fprintf(stderr, "File name: %s\n", result->file_name);

613

fprintf_plus(stderr, "File name: %s\n", result->file_name);

314

614

}

315

gpgme_recipient_t recipient;

316

recipient = result->recipients;

317

while(recipient != NULL){

318

fprintf(stderr, "Public key algorithm: %s\n",

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

321

fprintf(stderr, "Secret key available: %s\n",

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

324

recipient = recipient->next;

615

616

for(gpgme_recipient_t r = result->recipients; r != NULL;

617

r = r->next){

618

fprintf_plus(stderr, "Public key algorithm: %s\n",

619

gpgme_pubkey_algo_name(r->pubkey_algo));

620

fprintf_plus(stderr, "Key ID: %s\n", r->keyid);

621

fprintf_plus(stderr, "Secret key available: %s\n",

622

r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");

325

623

}

326

624

}

327

625

}

329

627

}

330

628

331

629

if(debug){

332

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

630

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

333

631

}

334

632

335

633

/* Seek back to the beginning of the GPGME plaintext data buffer */

336

634

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

337

perror("gpgme_data_seek");

635

perror_plus("gpgme_data_seek");

338

636

plaintext_length = -1;

339

637

goto decrypt_end;

340

638

}

342

640

*plaintext = NULL;

343

641

while(true){

344

642

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

643

(size_t)plaintext_length,

644

plaintext_capacity);

347

645

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

646

perror_plus("incbuffer");

647

plaintext_length = -1;

648

goto decrypt_end;

351

649

}

352

650

353

651

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

656

break;

359

657

}

360

658

if(ret < 0){

361

perror("gpgme_data_read");

659

perror_plus("gpgme_data_read");

362

660

plaintext_length = -1;

363

661

goto decrypt_end;

364

662

}

366

664

}

367

665

368

666

if(debug){

369

fprintf(stderr, "Decrypted password is: ");

667

fprintf_plus(stderr, "Decrypted password is: ");

370

668

for(ssize_t i = 0; i < plaintext_length; i++){

371

669

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

372

670

}

383

681

return plaintext_length;

384

682

}

385

683

386

static const char * safer_gnutls_strerror(int value){

387

const char *ret = gnutls_strerror(value); /* Spurious warning from

388

-Wunreachable-code */

389

if(ret == NULL)

390

ret = "(unknown)";

391

return ret;

684

__attribute__((warn_unused_result, const))

685

static const char *safe_string(const char *str){

686

if(str == NULL)

687

return "(unknown)";

688

return str;

689

}

690

691

__attribute__((warn_unused_result))

692

static const char *safer_gnutls_strerror(int value){

693

const char *ret = gnutls_strerror(value);

694

return safe_string(ret);

392

695

}

393

696

394

697

/* GnuTLS log function callback */

698

__attribute__((nonnull))

395

699

static void debuggnutls(__attribute__((unused)) int level,

396

700

const char* string){

397

fprintf(stderr, "GnuTLS: %s", string);

701

fprintf_plus(stderr, "GnuTLS: %s", string);

398

702

}

399

703

704

__attribute__((nonnull(1, 2, 4), warn_unused_result))

400

705

static int init_gnutls_global(const char *pubkeyfilename,

401

const char *seckeyfilename){

706

const char *seckeyfilename,

707

const char *dhparamsfilename,

708

mandos_context *mc){

402

709

int ret;

403

710

404

711

if(debug){

405

fprintf(stderr, "Initializing GnuTLS\n");

406

}

407

408

ret = gnutls_global_init();

409

if(ret != GNUTLS_E_SUCCESS){

410

fprintf(stderr, "GnuTLS global_init: %s\n",

411

safer_gnutls_strerror(ret));

412

return -1;

712

fprintf_plus(stderr, "Initializing GnuTLS\n");

413

713

}

414

714

415

715

if(debug){

421

721

}

422

722

423

723

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

724

ret = gnutls_certificate_allocate_credentials(&mc->cred);

425

725

if(ret != GNUTLS_E_SUCCESS){

426

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

431

gnutls_global_deinit();

726

fprintf_plus(stderr, "GnuTLS memory error: %s\n",

727

safer_gnutls_strerror(ret));

432

728

return -1;

433

729

}

434

730

435

731

if(debug){

436

fprintf(stderr, "Attempting to use OpenPGP public key %s and"

437

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

438

seckeyfilename);

732

fprintf_plus(stderr, "Attempting to use public key %s and"

733

" private key %s as GnuTLS credentials\n",

734

pubkeyfilename,

735

seckeyfilename);

439

736

}

440

737

738

#if GNUTLS_VERSION_NUMBER >= 0x030606

739

ret = gnutls_certificate_set_rawpk_key_file

740

(mc->cred, pubkeyfilename, seckeyfilename,

741

GNUTLS_X509_FMT_PEM, /* format */

742

NULL, /* pass */

743

/* key_usage */

744

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

745

NULL, /* names */

746

0, /* names_length */

747

/* privkey_flags */

748

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

749

0); /* pkcs11_flags */

750

#elif GNUTLS_VERSION_NUMBER < 0x030600

441

751

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

752

(mc->cred, pubkeyfilename, seckeyfilename,

443

753

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

756

#endif

444

757

if(ret != GNUTLS_E_SUCCESS){

445

fprintf(stderr,

446

"Error[%d] while reading the OpenPGP key pair ('%s',"

447

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

448

fprintf(stderr, "The GnuTLS error is: %s\n",

449

safer_gnutls_strerror(ret));

758

fprintf_plus(stderr,

759

"Error[%d] while reading the key pair ('%s',"

760

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

761

fprintf_plus(stderr, "The GnuTLS error is: %s\n",

762

safer_gnutls_strerror(ret));

450

763

goto globalfail;

451

764

}

452

765

453

766

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

455

if(ret != GNUTLS_E_SUCCESS){

456

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

457

" %s\n", safer_gnutls_strerror(ret));

458

goto globalfail;

459

}

460

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

461

if(ret != GNUTLS_E_SUCCESS){

462

fprintf(stderr, "Error in GnuTLS prime generation: %s\n",

463

safer_gnutls_strerror(ret));

464

goto globalfail;

465

}

466

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

767

ret = gnutls_dh_params_init(&mc->dh_params);

768

if(ret != GNUTLS_E_SUCCESS){

769

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

770

" initialization: %s\n",

771

safer_gnutls_strerror(ret));

772

goto globalfail;

773

}

774

/* If a Diffie-Hellman parameters file was given, try to use it */

775

if(dhparamsfilename != NULL){

776

gnutls_datum_t params = { .data = NULL, .size = 0 };

777

do {

778

int dhpfile = open(dhparamsfilename, O_RDONLY);

779

if(dhpfile == -1){

780

perror_plus("open");

781

dhparamsfilename = NULL;

782

break;

783

}

784

size_t params_capacity = 0;

785

while(true){

786

params_capacity = incbuffer((char **)&params.data,

787

(size_t)params.size,

788

(size_t)params_capacity);

789

if(params_capacity == 0){

790

perror_plus("incbuffer");

791

free(params.data);

792

params.data = NULL;

793

dhparamsfilename = NULL;

794

break;

795

}

796

ssize_t bytes_read = read(dhpfile,

797

params.data + params.size,

798

BUFFER_SIZE);

799

/* EOF */

800

if(bytes_read == 0){

801

break;

802

}

803

/* check bytes_read for failure */

804

if(bytes_read < 0){

805

perror_plus("read");

806

free(params.data);

807

params.data = NULL;

808

dhparamsfilename = NULL;

809

break;

810

}

811

params.size += (unsigned int)bytes_read;

812

}

813

ret = close(dhpfile);

814

if(ret == -1){

815

perror_plus("close");

816

}

817

if(params.data == NULL){

818

dhparamsfilename = NULL;

819

}

820

if(dhparamsfilename == NULL){

821

break;

822

}

823

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

824

GNUTLS_X509_FMT_PEM);

825

if(ret != GNUTLS_E_SUCCESS){

826

fprintf_plus(stderr, "Failed to parse DH parameters in file"

827

" \"%s\": %s\n", dhparamsfilename,

828

safer_gnutls_strerror(ret));

829

dhparamsfilename = NULL;

830

}

831

free(params.data);

832

} while(false);

833

}

834

if(dhparamsfilename == NULL){

835

if(mc->dh_bits == 0){

836

#if GNUTLS_VERSION_NUMBER < 0x030600

837

/* Find out the optimal number of DH bits */

838

/* Try to read the private key file */

839

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

840

do {

841

int secfile = open(seckeyfilename, O_RDONLY);

842

if(secfile == -1){

843

perror_plus("open");

844

break;

845

}

846

size_t buffer_capacity = 0;

847

while(true){

848

buffer_capacity = incbuffer((char **)&buffer.data,

849

(size_t)buffer.size,

850

(size_t)buffer_capacity);

851

if(buffer_capacity == 0){

852

perror_plus("incbuffer");

853

free(buffer.data);

854

buffer.data = NULL;

855

break;

856

}

857

ssize_t bytes_read = read(secfile,

858

buffer.data + buffer.size,

859

BUFFER_SIZE);

860

/* EOF */

861

if(bytes_read == 0){

862

break;

863

}

864

/* check bytes_read for failure */

865

if(bytes_read < 0){

866

perror_plus("read");

867

free(buffer.data);

868

buffer.data = NULL;

869

break;

870

}

871

buffer.size += (unsigned int)bytes_read;

872

}

873

close(secfile);

874

} while(false);

875

/* If successful, use buffer to parse private key */

876

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

877

if(buffer.data != NULL){

878

{

879

gnutls_openpgp_privkey_t privkey = NULL;

880

ret = gnutls_openpgp_privkey_init(&privkey);

881

if(ret != GNUTLS_E_SUCCESS){

882

fprintf_plus(stderr, "Error initializing OpenPGP key"

883

" structure: %s",

884

safer_gnutls_strerror(ret));

885

free(buffer.data);

886

buffer.data = NULL;

887

} else {

888

ret = gnutls_openpgp_privkey_import

889

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

890

if(ret != GNUTLS_E_SUCCESS){

891

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

892

safer_gnutls_strerror(ret));

893

privkey = NULL;

894

}

895

free(buffer.data);

896

buffer.data = NULL;

897

if(privkey != NULL){

898

/* Use private key to suggest an appropriate

899

sec_param */

900

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

901

gnutls_openpgp_privkey_deinit(privkey);

902

if(debug){

903

fprintf_plus(stderr, "This OpenPGP key implies using"

904

" a GnuTLS security parameter \"%s\".\n",

905

safe_string(gnutls_sec_param_get_name

906

(sec_param)));

907

}

908

}

909

}

910

}

911

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

912

/* Err on the side of caution */

913

sec_param = GNUTLS_SEC_PARAM_ULTRA;

914

if(debug){

915

fprintf_plus(stderr, "Falling back to security parameter"

916

" \"%s\"\n",

917

safe_string(gnutls_sec_param_get_name

918

(sec_param)));

919

}

920

}

921

}

922

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

923

if(uret != 0){

924

mc->dh_bits = uret;

925

if(debug){

926

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

927

" implies %u DH bits; using that.\n",

928

safe_string(gnutls_sec_param_get_name

929

(sec_param)),

930

mc->dh_bits);

931

}

932

} else {

933

fprintf_plus(stderr, "Failed to get implied number of DH"

934

" bits for security parameter \"%s\"): %s\n",

935

safe_string(gnutls_sec_param_get_name

936

(sec_param)),

937

safer_gnutls_strerror(ret));

938

goto globalfail;

939

}

940

#endif

941

} else { /* dh_bits != 0 */

942

if(debug){

943

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

944

mc->dh_bits);

945

}

946

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

947

if(ret != GNUTLS_E_SUCCESS){

948

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

949

" bits): %s\n", mc->dh_bits,

950

safer_gnutls_strerror(ret));

951

goto globalfail;

952

}

953

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

954

}

955

}

468

956

469

957

return 0;

470

958

471

959

globalfail:

472

960

473

gnutls_certificate_free_credentials(mc.cred);

474

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

961

gnutls_certificate_free_credentials(mc->cred);

962

gnutls_dh_params_deinit(mc->dh_params);

476

963

return -1;

477

964

}

478

965

479

static int init_gnutls_session(gnutls_session_t *session){

966

__attribute__((nonnull, warn_unused_result))

967

static int init_gnutls_session(gnutls_session_t *session,

968

mandos_context *mc){

480

969

int ret;

481

970

/* GnuTLS session creation */

482

971

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

972

ret = gnutls_init(session, (GNUTLS_SERVER

973

#if GNUTLS_VERSION_NUMBER >= 0x030506

974

| GNUTLS_NO_TICKETS

975

#endif

976

#if GNUTLS_VERSION_NUMBER >= 0x030606

977

| GNUTLS_ENABLE_RAWPK

978

#endif

979

));

484

980

if(quit_now){

485

981

return -1;

486

982

}

487

983

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

488

984

if(ret != GNUTLS_E_SUCCESS){

489

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

490

safer_gnutls_strerror(ret));

985

fprintf_plus(stderr,

986

"Error in GnuTLS session initialization: %s\n",

987

safer_gnutls_strerror(ret));

491

988

}

492

989

493

990

{

494

991

const char *err;

495

992

do {

496

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

993

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

497

994

if(quit_now){

498

995

gnutls_deinit(*session);

499

996

return -1;

500

997

}

501

998

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

502

999

if(ret != GNUTLS_E_SUCCESS){

503

fprintf(stderr, "Syntax error at: %s\n", err);

504

fprintf(stderr, "GnuTLS error: %s\n",

505

safer_gnutls_strerror(ret));

1000

fprintf_plus(stderr, "Syntax error at: %s\n", err);

1001

fprintf_plus(stderr, "GnuTLS error: %s\n",

1002

safer_gnutls_strerror(ret));

506

1003

gnutls_deinit(*session);

507

1004

return -1;

508

1005

}

510

1007

511

1008

do {

512

1009

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

1010

mc->cred);

514

1011

if(quit_now){

515

1012

gnutls_deinit(*session);

516

1013

return -1;

517

1014

}

518

1015

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

519

1016

if(ret != GNUTLS_E_SUCCESS){

520

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

521

safer_gnutls_strerror(ret));

1017

fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",

1018

safer_gnutls_strerror(ret));

522

1019

gnutls_deinit(*session);

523

1020

return -1;

524

1021

}

526

1023

/* ignore client certificate if any. */

527

1024

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

1025

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

531

1026

return 0;

532

1027

}

533

1028

535

1030

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

536

1031

__attribute__((unused)) const char *txt){}

537

1032

1033

/* Helper function to add_local_route() and delete_local_route() */

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool add_delete_local_route(const bool add,

1036

const char *address,

1037

AvahiIfIndex if_index){

1038

int ret;

1039

char helper[] = "mandos-client-iprouteadddel";

1040

char add_arg[] = "add";

1041

char delete_arg[] = "delete";

1042

char debug_flag[] = "--debug";

1043

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

1044

if(pluginhelperdir == NULL){

1045

if(debug){

1046

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

1047

" variable not set; cannot run helper\n");

1048

}

1049

return false;

1050

}

1051

1052

char interface[IF_NAMESIZE];

1053

if(if_indextoname((unsigned int)if_index, interface) == NULL){

1054

perror_plus("if_indextoname");

1055

return false;

1056

}

1057

1058

int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));

1059

if(devnull == -1){

1060

perror_plus("open(\"/dev/null\", O_RDONLY)");

1061

return false;

1062

}

1063

pid_t pid = fork();

1064

if(pid == 0){

1065

/* Child */

1066

/* Raise privileges */

1067

errno = raise_privileges_permanently();

1068

if(errno != 0){

1069

perror_plus("Failed to raise privileges");

1070

/* _exit(EX_NOPERM); */

1071

} else {

1072

/* Set group */

1073

errno = 0;

1074

ret = setgid(0);

1075

if(ret == -1){

1076

perror_plus("setgid");

1077

close(devnull);

1078

_exit(EX_NOPERM);

1079

}

1080

/* Reset supplementary groups */

1081

errno = 0;

1082

ret = setgroups(0, NULL);

1083

if(ret == -1){

1084

perror_plus("setgroups");

1085

close(devnull);

1086

_exit(EX_NOPERM);

1087

}

1088

}

1089

ret = dup2(devnull, STDIN_FILENO);

1090

if(ret == -1){

1091

perror_plus("dup2(devnull, STDIN_FILENO)");

1092

close(devnull);

1093

_exit(EX_OSERR);

1094

}

1095

ret = close(devnull);

1096

if(ret == -1){

1097

perror_plus("close");

1098

}

1099

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1100

if(ret == -1){

1101

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1102

_exit(EX_OSERR);

1103

}

1104

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

1105

O_RDONLY

1106

| O_DIRECTORY

1107

| O_PATH

1108

| O_CLOEXEC));

1109

if(helperdir_fd == -1){

1110

perror_plus("open");

1111

_exit(EX_UNAVAILABLE);

1112

}

1113

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

1114

helper, O_RDONLY));

1115

if(helper_fd == -1){

1116

perror_plus("openat");

1117

close(helperdir_fd);

1118

_exit(EX_UNAVAILABLE);

1119

}

1120

close(helperdir_fd);

1121

#ifdef __GNUC__

1122

#pragma GCC diagnostic push

1123

#pragma GCC diagnostic ignored "-Wcast-qual"

1124

#endif

1125

if(fexecve(helper_fd, (char *const [])

1126

{ helper, add ? add_arg : delete_arg, (char *)address,

1127

interface, debug ? debug_flag : NULL, NULL },

1128

environ) == -1){

1129

#ifdef __GNUC__

1130

#pragma GCC diagnostic pop

1131

#endif

1132

perror_plus("fexecve");

1133

_exit(EXIT_FAILURE);

1134

}

1135

}

1136

if(pid == -1){

1137

perror_plus("fork");

1138

close(devnull);

1139

return false;

1140

}

1141

ret = close(devnull);

1142

if(ret == -1){

1143

perror_plus("close");

1144

}

1145

int status;

1146

pid_t pret = -1;

1147

errno = 0;

1148

do {

1149

pret = waitpid(pid, &status, 0);

1150

if(pret == -1 and errno == EINTR and quit_now){

1151

int errno_raising = 0;

1152

if((errno = raise_privileges()) != 0){

1153

errno_raising = errno;

1154

perror_plus("Failed to raise privileges in order to"

1155

" kill helper program");

1156

}

1157

if(kill(pid, SIGTERM) == -1){

1158

perror_plus("kill");

1159

}

1160

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

1161

perror_plus("Failed to lower privileges after killing"

1162

" helper program");

1163

}

1164

return false;

1165

}

1166

} while(pret == -1 and errno == EINTR);

1167

if(pret == -1){

1168

perror_plus("waitpid");

1169

return false;

1170

}

1171

if(WIFEXITED(status)){

1172

if(WEXITSTATUS(status) != 0){

1173

fprintf_plus(stderr, "Error: iprouteadddel exited"

1174

" with status %d\n", WEXITSTATUS(status));

1175

return false;

1176

}

1177

return true;

1178

}

1179

if(WIFSIGNALED(status)){

1180

fprintf_plus(stderr, "Error: iprouteadddel died by"

1181

" signal %d\n", WTERMSIG(status));

1182

return false;

1183

}

1184

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1185

return false;

1186

}

1187

1188

__attribute__((nonnull, warn_unused_result))

1189

static bool add_local_route(const char *address,

1190

AvahiIfIndex if_index){

1191

if(debug){

1192

fprintf_plus(stderr, "Adding route to %s\n", address);

1193

}

1194

return add_delete_local_route(true, address, if_index);

1195

}

1196

1197

__attribute__((nonnull, warn_unused_result))

1198

static bool delete_local_route(const char *address,

1199

AvahiIfIndex if_index){

1200

if(debug){

1201

fprintf_plus(stderr, "Removing route to %s\n", address);

1202

}

1203

return add_delete_local_route(false, address, if_index);

1204

}

1205

538

1206

/* Called when a Mandos server is found */

539

static int start_mandos_communication(const char *ip, uint16_t port,

1207

__attribute__((nonnull, warn_unused_result))

1208

static int start_mandos_communication(const char *ip, in_port_t port,

540

1209

AvahiIfIndex if_index,

541

int af){

1210

int af, mandos_context *mc){

542

1211

int ret, tcp_sd = -1;

543

1212

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

1213

struct sockaddr_storage to;

548

1214

char *buffer = NULL;

549

1215

char *decrypted_buffer = NULL;

550

1216

size_t buffer_length = 0;

553

1219

int retval = -1;

554

1220

gnutls_session_t session;

555

1221

int pf; /* Protocol family */

1222

bool route_added = false;

556

1223

557

1224

errno = 0;

558

1225

569

1236

pf = PF_INET;

570

1237

break;

571

1238

default:

572

fprintf(stderr, "Bad address family: %d\n", af);

1239

fprintf_plus(stderr, "Bad address family: %d\n", af);

573

1240

errno = EINVAL;

574

1241

return -1;

575

1242

}

576

1243

577

ret = init_gnutls_session(&session);

1244

/* If the interface is specified and we have a list of interfaces */

1245

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

1246

/* Check if the interface is one of the interfaces we are using */

1247

bool match = false;

1248

{

1249

char *interface = NULL;

1250

while((interface = argz_next(mc->interfaces,

1251

mc->interfaces_size,

1252

interface))){

1253

if(if_nametoindex(interface) == (unsigned int)if_index){

1254

match = true;

1255

break;

1256

}

1257

}

1258

}

1259

if(not match){

1260

/* This interface does not match any in the list, so we don't

1261

connect to the server */

1262

if(debug){

1263

char interface[IF_NAMESIZE];

1264

if(if_indextoname((unsigned int)if_index, interface) == NULL){

1265

perror_plus("if_indextoname");

1266

} else {

1267

fprintf_plus(stderr, "Skipping server on non-used interface"

1268

" \"%s\"\n",

1269

if_indextoname((unsigned int)if_index,

1270

interface));

1271

}

1272

}

1273

return -1;

1274

}

1275

}

1276

1277

ret = init_gnutls_session(&session, mc);

578

1278

if(ret != 0){

579

1279

return -1;

580

1280

}

581

1281

582

1282

if(debug){

583

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

584

"\n", ip, port);

1283

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

1284

PRIuMAX "\n", ip, (uintmax_t)port);

585

1285

}

586

1286

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

1287

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

588

1288

if(tcp_sd < 0){

589

1289

int e = errno;

590

perror("socket");

1290

perror_plus("socket");

591

1291

errno = e;

592

1292

goto mandos_end;

593

1293

}

597

1297

goto mandos_end;

598

1298

}

599

1299

600

memset(&to, 0, sizeof(to));

601

1300

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

ret = inet_pton(af, ip, &to.in6.sin6_addr);

1301

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1302

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1303

ret = inet_pton(af, ip, &to6->sin6_addr);

604

1304

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

ret = inet_pton(af, ip, &to.in.sin_addr);

1305

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1306

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1307

ret = inet_pton(af, ip, &to4->sin_addr);

607

1308

}

608

1309

if(ret < 0 ){

609

1310

int e = errno;

610

perror("inet_pton");

1311

perror_plus("inet_pton");

611

1312

errno = e;

612

1313

goto mandos_end;

613

1314

}

614

1315

if(ret == 0){

615

1316

int e = errno;

616

fprintf(stderr, "Bad address: %s\n", ip);

1317

fprintf_plus(stderr, "Bad address: %s\n", ip);

617

1318

errno = e;

618

1319

goto mandos_end;

619

1320

}

620

1321

if(af == AF_INET6){

621

to.in6.sin6_port = htons(port); /* Spurious warnings from

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

627

-Wunreachable-code*/

1322

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

1323

if(IN6_IS_ADDR_LINKLOCAL

1324

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

628

1325

if(if_index == AVAHI_IF_UNSPEC){

629

fprintf(stderr, "An IPv6 link-local address is incomplete"

630

" without a network interface\n");

1326

fprintf_plus(stderr, "An IPv6 link-local address is"

1327

" incomplete without a network interface\n");

631

1328

errno = EINVAL;

632

1329

goto mandos_end;

633

1330

}

634

1331

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

1332

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

636

1333

}

637

1334

} else {

638

to.in.sin_port = htons(port); /* Spurious warnings from

639

-Wconversion and

640

-Wunreachable-code */

1335

((struct sockaddr_in *)&to)->sin_port = htons(port);

641

1336

}

642

1337

643

1338

if(quit_now){

649

1344

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

650

1345

char interface[IF_NAMESIZE];

651

1346

if(if_indextoname((unsigned int)if_index, interface) == NULL){

652

perror("if_indextoname");

1347

perror_plus("if_indextoname");

653

1348

} else {

654

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

655

ip, interface, port);

1349

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

1350

"\n", ip, interface, (uintmax_t)port);

656

1351

}

657

1352

} else {

658

fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,

659

port);

1353

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

1354

ip, (uintmax_t)port);

660

1355

}

661

1356

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

1357

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

if(af == AF_INET6){

665

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

666

sizeof(addrstr));

667

} else {

668

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

669

sizeof(addrstr));

670

}

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

if(strcmp(addrstr, ip) != 0){

675

fprintf(stderr, "Canonical address form: %s\n", addrstr);

676

}

677

}

678

}

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

if(af == AF_INET6){

686

ret = connect(tcp_sd, &to.in6, sizeof(to));

687

} else {

688

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

689

}

690

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

1358

if(af == AF_INET6){

1359

ret = getnameinfo((struct sockaddr *)&to,

1360

sizeof(struct sockaddr_in6),

1361

addrstr, sizeof(addrstr), NULL, 0,

1362

NI_NUMERICHOST);

1363

} else {

1364

ret = getnameinfo((struct sockaddr *)&to,

1365

sizeof(struct sockaddr_in),

1366

addrstr, sizeof(addrstr), NULL, 0,

1367

NI_NUMERICHOST);

1368

}

1369

if(ret == EAI_SYSTEM){

1370

perror_plus("getnameinfo");

1371

} else if(ret != 0) {

1372

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

1373

} else if(strcmp(addrstr, ip) != 0){

1374

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

1375

}

1376

}

1377

1378

if(quit_now){

1379

errno = EINTR;

1380

goto mandos_end;

1381

}

1382

1383

while(true){

1384

if(af == AF_INET6){

1385

ret = connect(tcp_sd, (struct sockaddr *)&to,

1386

sizeof(struct sockaddr_in6));

1387

} else {

1388

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

1389

sizeof(struct sockaddr_in));

1390

}

1391

if(ret < 0){

1392

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1393

and if_index != AVAHI_IF_UNSPEC

1394

and connect_to == NULL

1395

and not route_added and

1396

((af == AF_INET6 and not

1397

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1398

&to)->sin6_addr)))

1399

or (af == AF_INET and

1400

/* Not a a IPv4LL address */

1401

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1402

& 0xFFFF0000L) != 0xA9FE0000L))){

1403

/* Work around Avahi bug - Avahi does not announce link-local

1404

addresses if it has a global address, so local hosts with

1405

*only* a link-local address (e.g. Mandos clients) cannot

1406

connect to a Mandos server announced by Avahi on a server

1407

host with a global address. Work around this by retrying

1408

with an explicit route added with the server's address.

1409

1410

Avahi bug reference:

1411

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1412

https://bugs.debian.org/587961

1413

*/

1414

if(debug){

1415

fprintf_plus(stderr, "Mandos server unreachable, trying"

1416

" direct route\n");

1417

}

1418

int e = errno;

1419

route_added = add_local_route(ip, if_index);

1420

if(route_added){

1421

continue;

1422

}

1423

errno = e;

1424

}

1425

if(errno != ECONNREFUSED or debug){

1426

int e = errno;

1427

perror_plus("connect");

1428

errno = e;

1429

}

1430

goto mandos_end;

1431

}

1432

1433

if(quit_now){

1434

errno = EINTR;

1435

goto mandos_end;

1436

}

1437

break;

700

1438

}

701

1439

702

1440

const char *out = mandos_protocol_version;

704

1442

while(true){

705

1443

size_t out_size = strlen(out);

706

1444

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

707

out_size - written));

1445

out_size - written));

708

1446

if(ret == -1){

709

1447

int e = errno;

710

perror("write");

1448

perror_plus("write");

711

1449

errno = e;

712

1450

goto mandos_end;

713

1451

}

730

1468

}

731

1469

732

1470

if(debug){

733

fprintf(stderr, "Establishing TLS session with %s\n", ip);

1471

fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);

734

1472

}

735

1473

736

1474

if(quit_now){

738

1476

goto mandos_end;

739

1477

}

740

1478

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1479

/* This casting via intptr_t is to eliminate warning about casting

1480

an int to a pointer type. This is exactly how the GnuTLS Guile

1481

function "set-session-transport-fd!" does it. */

1482

gnutls_transport_set_ptr(session,

1483

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

1484

743

1485

if(quit_now){

744

1486

errno = EINTR;

755

1497

756

1498

if(ret != GNUTLS_E_SUCCESS){

757

1499

if(debug){

758

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

1500

fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");

759

1501

gnutls_perror(ret);

760

1502

}

761

1503

errno = EPROTO;

765

1507

/* Read OpenPGP packet that contains the wanted password */

766

1508

767

1509

if(debug){

768

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

769

ip);

1510

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1511

" %s\n", ip);

770

1512

}

771

1513

772

1514

while(true){

777

1519

}

778

1520

779

1521

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

1522

buffer_capacity);

781

1523

if(buffer_capacity == 0){

782

1524

int e = errno;

783

perror("incbuffer");

1525

perror_plus("incbuffer");

784

1526

errno = e;

785

1527

goto mandos_end;

786

1528

}

810

1552

}

811

1553

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

812

1554

if(ret < 0){

813

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

1555

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

1556

"***\n");

814

1557

gnutls_perror(ret);

815

1558

errno = EPROTO;

816

1559

goto mandos_end;

817

1560

}

818

1561

break;

819

1562

default:

820

fprintf(stderr, "Unknown error while reading data from"

821

" encrypted session with Mandos server\n");

1563

fprintf_plus(stderr, "Unknown error while reading data from"

1564

" encrypted session with Mandos server\n");

822

1565

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

1566

errno = EIO;

824

1567

goto mandos_end;

829

1572

}

830

1573

831

1574

if(debug){

832

fprintf(stderr, "Closing TLS session\n");

1575

fprintf_plus(stderr, "Closing TLS session\n");

833

1576

}

834

1577

835

1578

if(quit_now){

847

1590

848

1591

if(buffer_length > 0){

849

1592

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1593

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1594

&decrypted_buffer, mc);

853

1595

if(decrypted_buffer_size >= 0){

854

1596

1597

clearerr(stdout);

855

1598

written = 0;

856

1599

while(written < (size_t) decrypted_buffer_size){

857

1600

if(quit_now){

865

1608

if(ret == 0 and ferror(stdout)){

866

1609

int e = errno;

867

1610

if(debug){

868

fprintf(stderr, "Error writing encrypted data: %s\n",

869

strerror(errno));

1611

fprintf_plus(stderr, "Error writing encrypted data: %s\n",

1612

strerror(errno));

870

1613

}

871

1614

errno = e;

872

1615

goto mandos_end;

873

1616

}

874

1617

written += (size_t)ret;

875

1618

}

1619

ret = fflush(stdout);

1620

if(ret != 0){

1621

int e = errno;

1622

if(debug){

1623

fprintf_plus(stderr, "Error writing encrypted data: %s\n",

1624

strerror(errno));

1625

}

1626

errno = e;

1627

goto mandos_end;

1628

}

876

1629

retval = 0;

877

1630

}

878

1631

}

881

1634

882

1635

mandos_end:

883

1636

{

1637

if(route_added){

1638

if(not delete_local_route(ip, if_index)){

1639

fprintf_plus(stderr, "Failed to delete local route to %s on"

1640

" interface %d", ip, if_index);

1641

}

1642

}

884

1643

int e = errno;

885

1644

free(decrypted_buffer);

886

1645

free(buffer);

887

1646

if(tcp_sd >= 0){

888

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

1647

ret = close(tcp_sd);

889

1648

}

890

1649

if(ret == -1){

891

1650

if(e == 0){

892

1651

e = errno;

893

1652

}

894

perror("close");

1653

perror_plus("close");

895

1654

}

896

1655

gnutls_deinit(session);

1656

errno = e;

897

1657

if(quit_now){

898

e = EINTR;

1658

errno = EINTR;

899

1659

retval = -1;

900

1660

}

901

errno = e;

902

1661

}

903

1662

return retval;

904

1663

}

916

1675

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1676

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1677

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1678

void *mc){

1679

if(r == NULL){

1680

return;

1681

}

921

1682

922

1683

/* Called whenever a service has been resolved successfully or

923

1684

timed out */

924

1685

925

1686

if(quit_now){

1687

avahi_s_service_resolver_free(r);

926

1688

return;

927

1689

}

928

1690

929

1691

switch(event){

930

1692

default:

931

1693

case AVAHI_RESOLVER_FAILURE:

932

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

933

" of type '%s' in domain '%s': %s\n", name, type, domain,

934

avahi_strerror(avahi_server_errno(mc.server)));

1694

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1695

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1696

domain,

1697

avahi_strerror(avahi_server_errno

1698

(((mandos_context*)mc)->server)));

935

1699

break;

936

1700

937

1701

case AVAHI_RESOLVER_FOUND:

939

1703

char ip[AVAHI_ADDRESS_STR_MAX];

940

1704

avahi_address_snprint(ip, sizeof(ip), address);

941

1705

if(debug){

942

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

943

PRIdMAX ") on port %" PRIu16 "\n", name, host_name,

944

ip, (intmax_t)interface, port);

1706

fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"

1707

PRIdMAX ") on port %" PRIu16 "\n", name,

1708

host_name, ip, (intmax_t)interface, port);

945

1709

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1710

int ret = start_mandos_communication(ip, (in_port_t)port,

1711

interface,

1712

avahi_proto_to_af(proto),

1713

mc);

948

1714

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1715

avahi_simple_poll_quit(simple_poll);

1716

} else {

1717

if(not add_server(ip, (in_port_t)port, interface,

1718

avahi_proto_to_af(proto),

1719

&((mandos_context*)mc)->current_server)){

1720

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1721

" list\n", name);

1722

}

950

1723

}

951

1724

}

952

1725

}

962

1735

const char *domain,

963

1736

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1737

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1738

void *mc){

1739

if(b == NULL){

1740

return;

1741

}

967

1742

968

1743

/* Called whenever a new services becomes available on the LAN or

969

1744

is removed from the LAN */

976

1751

default:

977

1752

case AVAHI_BROWSER_FAILURE:

978

1753

979

fprintf(stderr, "(Avahi browser) %s\n",

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1754

fprintf_plus(stderr, "(Avahi browser) %s\n",

1755

avahi_strerror(avahi_server_errno

1756

(((mandos_context*)mc)->server)));

1757

avahi_simple_poll_quit(simple_poll);

982

1758

return;

983

1759

984

1760

case AVAHI_BROWSER_NEW:

987

1763

the callback function is called the Avahi server will free the

988

1764

resolver for us. */

989

1765

990

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

994

name, avahi_strerror(avahi_server_errno(mc.server)));

1766

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1767

interface, protocol, name, type,

1768

domain, protocol, 0,

1769

resolve_callback, mc) == NULL)

1770

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1771

" %s\n", name,

1772

avahi_strerror(avahi_server_errno

1773

(((mandos_context*)mc)->server)));

995

1774

break;

996

1775

997

1776

case AVAHI_BROWSER_REMOVE:

1000

1779

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1780

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1781

if(debug){

1003

fprintf(stderr, "No Mandos server found, still searching...\n");

1782

fprintf_plus(stderr, "No Mandos server found, still"

1783

" searching...\n");

1004

1784

}

1005

1785

break;

1006

1786

}

1007

1787

}

1008

1788

1009

/* stop main loop after sigterm has been called */

1789

/* Signal handler that stops main loop after SIGTERM */

1010

1790

static void handle_sigterm(int sig){

1011

1791

if(quit_now){

1012

1792

return;

1014

1794

quit_now = 1;

1015

1795

signal_received = sig;

1016

1796

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1797

/* set main loop to exit */

1798

if(simple_poll != NULL){

1799

avahi_simple_poll_quit(simple_poll);

1800

}

1801

errno = old_errno;

1802

}

1803

1804

__attribute__((nonnull, warn_unused_result))

1805

bool get_flags(const char *ifname, struct ifreq *ifr){

1806

int ret;

1807

int old_errno;

1808

1809

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1810

if(s < 0){

1811

old_errno = errno;

1812

perror_plus("socket");

1813

errno = old_errno;

1814

return false;

1815

}

1816

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1817

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1818

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1819

if(ret == -1){

1820

if(debug){

1821

old_errno = errno;

1822

perror_plus("ioctl SIOCGIFFLAGS");

1823

errno = old_errno;

1824

}

1825

if((close(s) == -1) and debug){

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1829

}

1830

return false;

1831

}

1832

if((close(s) == -1) and debug){

1833

old_errno = errno;

1834

perror_plus("close");

1835

errno = old_errno;

1836

}

1837

return true;

1838

}

1839

1840

__attribute__((nonnull, warn_unused_result))

1841

bool good_flags(const char *ifname, const struct ifreq *ifr){

1842

1843

/* Reject the loopback device */

1844

if(ifr->ifr_flags & IFF_LOOPBACK){

1845

if(debug){

1846

fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",

1847

ifname);

1848

}

1849

return false;

1850

}

1851

/* Accept point-to-point devices only if connect_to is specified */

1852

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1853

if(debug){

1854

fprintf_plus(stderr, "Accepting point-to-point interface"

1855

" \"%s\"\n", ifname);

1856

}

1857

return true;

1858

}

1859

/* Otherwise, reject non-broadcast-capable devices */

1860

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1861

if(debug){

1862

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1863

" \"%s\"\n", ifname);

1864

}

1865

return false;

1866

}

1867

/* Reject non-ARP interfaces (including dummy interfaces) */

1868

if(ifr->ifr_flags & IFF_NOARP){

1869

if(debug){

1870

fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",

1871

ifname);

1872

}

1873

return false;

1874

}

1875

1876

/* Accept this device */

1877

if(debug){

1878

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1879

}

1880

return true;

1881

}

1882

1883

/*

1884

* This function determines if a directory entry in /sys/class/net

1885

* corresponds to an acceptable network device.

1886

* (This function is passed to scandir(3) as a filter function.)

1887

*/

1888

__attribute__((nonnull, warn_unused_result))

1889

int good_interface(const struct dirent *if_entry){

1890

if(if_entry->d_name[0] == '.'){

1891

return 0;

1892

}

1893

1894

struct ifreq ifr;

1895

if(not get_flags(if_entry->d_name, &ifr)){

1896

if(debug){

1897

fprintf_plus(stderr, "Failed to get flags for interface "

1898

"\"%s\"\n", if_entry->d_name);

1899

}

1900

return 0;

1901

}

1902

1903

if(not good_flags(if_entry->d_name, &ifr)){

1904

return 0;

1905

}

1906

return 1;

1907

}

1908

1909

/*

1910

* This function determines if a network interface is up.

1911

*/

1912

__attribute__((nonnull, warn_unused_result))

1913

bool interface_is_up(const char *interface){

1914

struct ifreq ifr;

1915

if(not get_flags(interface, &ifr)){

1916

if(debug){

1917

fprintf_plus(stderr, "Failed to get flags for interface "

1918

"\"%s\"\n", interface);

1919

}

1920

return false;

1921

}

1922

1923

return (bool)(ifr.ifr_flags & IFF_UP);

1924

}

1925

1926

/*

1927

* This function determines if a network interface is running

1928

*/

1929

__attribute__((nonnull, warn_unused_result))

1930

bool interface_is_running(const char *interface){

1931

struct ifreq ifr;

1932

if(not get_flags(interface, &ifr)){

1933

if(debug){

1934

fprintf_plus(stderr, "Failed to get flags for interface "

1935

"\"%s\"\n", interface);

1936

}

1937

return false;

1938

}

1939

1940

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1941

}

1942

1943

__attribute__((nonnull, pure, warn_unused_result))

1944

int notdotentries(const struct dirent *direntry){

1945

/* Skip "." and ".." */

1946

if(direntry->d_name[0] == '.'

1947

and (direntry->d_name[1] == '\0'

1948

or (direntry->d_name[1] == '.'

1949

and direntry->d_name[2] == '\0'))){

1950

return 0;

1951

}

1952

return 1;

1953

}

1954

1955

/* Is this directory entry a runnable program? */

1956

__attribute__((nonnull, warn_unused_result))

1957

int runnable_hook(const struct dirent *direntry){

1958

int ret;

1959

size_t sret;

1960

struct stat st;

1961

1962

if((direntry->d_name)[0] == '\0'){

1963

/* Empty name? */

1964

return 0;

1965

}

1966

1967

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1968

"abcdefghijklmnopqrstuvwxyz"

1969

"0123456789"

1970

"_.-");

1971

if((direntry->d_name)[sret] != '\0'){

1972

/* Contains non-allowed characters */

1973

if(debug){

1974

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1975

direntry->d_name);

1976

}

1977

return 0;

1978

}

1979

1980

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1981

if(ret == -1){

1982

if(debug){

1983

perror_plus("Could not stat hook");

1984

}

1985

return 0;

1986

}

1987

if(not (S_ISREG(st.st_mode))){

1988

/* Not a regular file */

1989

if(debug){

1990

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1991

direntry->d_name);

1992

}

1993

return 0;

1994

}

1995

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1996

/* Not executable */

1997

if(debug){

1998

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1999

direntry->d_name);

2000

}

2001

return 0;

2002

}

2003

if(debug){

2004

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

2005

direntry->d_name);

2006

}

2007

return 1;

2008

}

2009

2010

__attribute__((nonnull, warn_unused_result))

2011

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

2012

mandos_context *mc){

2013

int ret;

2014

struct timespec now;

2015

struct timespec waited_time;

2016

intmax_t block_time;

2017

2018

while(true){

2019

if(mc->current_server == NULL){

2020

if(debug){

2021

fprintf_plus(stderr, "Wait until first server is found."

2022

" No timeout!\n");

2023

}

2024

ret = avahi_simple_poll_iterate(s, -1);

2025

} else {

2026

if(debug){

2027

fprintf_plus(stderr, "Check current_server if we should run"

2028

" it, or wait\n");

2029

}

2030

/* the current time */

2031

ret = clock_gettime(CLOCK_MONOTONIC, &now);

2032

if(ret == -1){

2033

perror_plus("clock_gettime");

2034

return -1;

2035

}

2036

/* Calculating in ms how long time between now and server

2037

who we visted longest time ago. Now - last seen. */

2038

waited_time.tv_sec = (now.tv_sec

2039

- mc->current_server->last_seen.tv_sec);

2040

waited_time.tv_nsec = (now.tv_nsec

2041

- mc->current_server->last_seen.tv_nsec);

2042

/* total time is 10s/10,000ms.

2043

Converting to s from ms by dividing by 1,000,

2044

and ns to ms by dividing by 1,000,000. */

2045

block_time = ((retry_interval

2046

- ((intmax_t)waited_time.tv_sec * 1000))

2047

- ((intmax_t)waited_time.tv_nsec / 1000000));

2048

2049

if(debug){

2050

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

2051

block_time);

2052

}

2053

2054

if(block_time <= 0){

2055

ret = start_mandos_communication(mc->current_server->ip,

2056

mc->current_server->port,

2057

mc->current_server->if_index,

2058

mc->current_server->af, mc);

2059

if(ret == 0){

2060

avahi_simple_poll_quit(s);

2061

return 0;

2062

}

2063

ret = clock_gettime(CLOCK_MONOTONIC,

2064

&mc->current_server->last_seen);

2065

if(ret == -1){

2066

perror_plus("clock_gettime");

2067

return -1;

2068

}

2069

mc->current_server = mc->current_server->next;

2070

block_time = 0; /* Call avahi to find new Mandos

2071

servers, but don't block */

2072

}

2073

2074

ret = avahi_simple_poll_iterate(s, (int)block_time);

2075

}

2076

if(ret != 0){

2077

if(ret > 0 or errno != EINTR){

2078

return (ret != 1) ? ret : 0;

2079

}

2080

}

2081

}

2082

}

2083

2084

__attribute__((nonnull))

2085

void run_network_hooks(const char *mode, const char *interface,

2086

const float delay){

2087

struct dirent **direntries = NULL;

2088

if(hookdir_fd == -1){

2089

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2090

| O_CLOEXEC);

2091

if(hookdir_fd == -1){

2092

if(errno == ENOENT){

2093

if(debug){

2094

fprintf_plus(stderr, "Network hook directory \"%s\" not"

2095

" found\n", hookdir);

2096

}

2097

} else {

2098

perror_plus("open");

2099

}

2100

return;

2101

}

2102

}

2103

int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));

2104

if(devnull == -1){

2105

perror_plus("open(\"/dev/null\", O_RDONLY)");

2106

return;

2107

}

2108

int numhooks = scandirat(hookdir_fd, ".", &direntries,

2109

runnable_hook, alphasort);

2110

if(numhooks == -1){

2111

perror_plus("scandir");

2112

close(devnull);

2113

return;

2114

}

2115

struct dirent *direntry;

2116

int ret;

2117

for(int i = 0; i < numhooks; i++){

2118

direntry = direntries[i];

2119

if(debug){

2120

fprintf_plus(stderr, "Running network hook \"%s\"\n",

2121

direntry->d_name);

2122

}

2123

pid_t hook_pid = fork();

2124

if(hook_pid == 0){

2125

/* Child */

2126

/* Raise privileges */

2127

errno = raise_privileges_permanently();

2128

if(errno != 0){

2129

perror_plus("Failed to raise privileges");

2130

_exit(EX_NOPERM);

2131

}

2132

/* Set group */

2133

errno = 0;

2134

ret = setgid(0);

2135

if(ret == -1){

2136

perror_plus("setgid");

2137

_exit(EX_NOPERM);

2138

}

2139

/* Reset supplementary groups */

2140

errno = 0;

2141

ret = setgroups(0, NULL);

2142

if(ret == -1){

2143

perror_plus("setgroups");

2144

_exit(EX_NOPERM);

2145

}

2146

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

2147

if(ret == -1){

2148

perror_plus("setenv");

2149

_exit(EX_OSERR);

2150

}

2151

ret = setenv("DEVICE", interface, 1);

2152

if(ret == -1){

2153

perror_plus("setenv");

2154

_exit(EX_OSERR);

2155

}

2156

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

2157

if(ret == -1){

2158

perror_plus("setenv");

2159

_exit(EX_OSERR);

2160

}

2161

ret = setenv("MODE", mode, 1);

2162

if(ret == -1){

2163

perror_plus("setenv");

2164

_exit(EX_OSERR);

2165

}

2166

char *delaystring;

2167

ret = asprintf(&delaystring, "%f", (double)delay);

2168

if(ret == -1){

2169

perror_plus("asprintf");

2170

_exit(EX_OSERR);

2171

}

2172

ret = setenv("DELAY", delaystring, 1);

2173

if(ret == -1){

2174

free(delaystring);

2175

perror_plus("setenv");

2176

_exit(EX_OSERR);

2177

}

2178

free(delaystring);

2179

if(connect_to != NULL){

2180

ret = setenv("CONNECT", connect_to, 1);

2181

if(ret == -1){

2182

perror_plus("setenv");

2183

_exit(EX_OSERR);

2184

}

2185

}

2186

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2187

direntry->d_name,

2188

O_RDONLY));

2189

if(hook_fd == -1){

2190

perror_plus("openat");

2191

_exit(EXIT_FAILURE);

2192

}

2193

if(close(hookdir_fd) == -1){

2194

perror_plus("close");

2195

_exit(EXIT_FAILURE);

2196

}

2197

ret = dup2(devnull, STDIN_FILENO);

2198

if(ret == -1){

2199

perror_plus("dup2(devnull, STDIN_FILENO)");

2200

_exit(EX_OSERR);

2201

}

2202

ret = close(devnull);

2203

if(ret == -1){

2204

perror_plus("close");

2205

_exit(EX_OSERR);

2206

}

2207

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2208

if(ret == -1){

2209

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

2210

_exit(EX_OSERR);

2211

}

2212

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2213

environ) == -1){

2214

perror_plus("fexecve");

2215

_exit(EXIT_FAILURE);

2216

}

2217

} else {

2218

if(hook_pid == -1){

2219

perror_plus("fork");

2220

free(direntry);

2221

continue;

2222

}

2223

int status;

2224

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

2225

perror_plus("waitpid");

2226

free(direntry);

2227

continue;

2228

}

2229

if(WIFEXITED(status)){

2230

if(WEXITSTATUS(status) != 0){

2231

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

2232

" with status %d\n", direntry->d_name,

2233

WEXITSTATUS(status));

2234

free(direntry);

2235

continue;

2236

}

2237

} else if(WIFSIGNALED(status)){

2238

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

2239

" signal %d\n", direntry->d_name,

2240

WTERMSIG(status));

2241

free(direntry);

2242

continue;

2243

} else {

2244

fprintf_plus(stderr, "Warning: network hook \"%s\""

2245

" crashed\n", direntry->d_name);

2246

free(direntry);

2247

continue;

2248

}

2249

}

2250

if(debug){

2251

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

2252

direntry->d_name);

2253

}

2254

free(direntry);

2255

}

2256

free(direntries);

2257

if(close(hookdir_fd) == -1){

2258

perror_plus("close");

2259

} else {

2260

hookdir_fd = -1;

2261

}

2262

close(devnull);

2263

}

2264

2265

__attribute__((nonnull, warn_unused_result))

2266

int bring_up_interface(const char *const interface,

2267

const float delay){

2268

int old_errno = errno;

2269

int ret;

2270

struct ifreq network;

2271

unsigned int if_index = if_nametoindex(interface);

2272

if(if_index == 0){

2273

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2274

errno = old_errno;

2275

return ENXIO;

2276

}

2277

2278

if(quit_now){

2279

errno = old_errno;

2280

return EINTR;

2281

}

2282

2283

if(not interface_is_up(interface)){

2284

int ret_errno = 0;

2285

int ioctl_errno = 0;

2286

if(not get_flags(interface, &network)){

2287

ret_errno = errno;

2288

fprintf_plus(stderr, "Failed to get flags for interface "

2289

"\"%s\"\n", interface);

2290

errno = old_errno;

2291

return ret_errno;

2292

}

2293

network.ifr_flags |= IFF_UP; /* set flag */

2294

2295

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

2296

if(sd == -1){

2297

ret_errno = errno;

2298

perror_plus("socket");

2299

errno = old_errno;

2300

return ret_errno;

2301

}

2302

2303

if(quit_now){

2304

ret = close(sd);

2305

if(ret == -1){

2306

perror_plus("close");

2307

}

2308

errno = old_errno;

2309

return EINTR;

2310

}

2311

2312

if(debug){

2313

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

2314

interface);

2315

}

2316

2317

/* Raise privileges */

2318

ret_errno = raise_privileges();

2319

if(ret_errno != 0){

2320

errno = ret_errno;

2321

perror_plus("Failed to raise privileges");

2322

}

2323

2324

#ifdef __linux__

2325

int ret_linux;

2326

bool restore_loglevel = false;

2327

if(ret_errno == 0){

2328

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2329

messages about the network interface to mess up the prompt */

2330

ret_linux = klogctl(8, NULL, 5);

2331

if(ret_linux == -1){

2332

perror_plus("klogctl");

2333

} else {

2334

restore_loglevel = true;

2335

}

2336

}

2337

#endif /* __linux__ */

2338

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2339

ioctl_errno = errno;

2340

#ifdef __linux__

2341

if(restore_loglevel){

2342

ret_linux = klogctl(7, NULL, 0);

2343

if(ret_linux == -1){

2344

perror_plus("klogctl");

2345

}

2346

}

2347

#endif /* __linux__ */

2348

2349

/* If raise_privileges() succeeded above */

2350

if(ret_errno == 0){

2351

/* Lower privileges */

2352

ret_errno = lower_privileges();

2353

if(ret_errno != 0){

2354

errno = ret_errno;

2355

perror_plus("Failed to lower privileges");

2356

}

2357

}

2358

2359

/* Close the socket */

2360

ret = close(sd);

2361

if(ret == -1){

2362

perror_plus("close");

2363

}

2364

2365

if(ret_setflags == -1){

2366

errno = ioctl_errno;

2367

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2368

errno = old_errno;

2369

return ioctl_errno;

2370

}

2371

} else if(debug){

2372

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

2373

interface);

2374

}

2375

2376

/* Sleep checking until interface is running.

2377

Check every 0.25s, up to total time of delay */

2378

for(int i = 0; i < delay * 4; i++){

2379

if(interface_is_running(interface)){

2380

break;

2381

}

2382

struct timespec sleeptime = { .tv_nsec = 250000000 };

2383

ret = nanosleep(&sleeptime, NULL);

2384

if(ret == -1 and errno != EINTR){

2385

perror_plus("nanosleep");

2386

}

2387

}

2388

2389

errno = old_errno;

2390

return 0;

2391

}

2392

2393

__attribute__((nonnull, warn_unused_result))

2394

int take_down_interface(const char *const interface){

2395

int old_errno = errno;

2396

struct ifreq network;

2397

unsigned int if_index = if_nametoindex(interface);

2398

if(if_index == 0){

2399

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2400

errno = old_errno;

2401

return ENXIO;

2402

}

2403

if(interface_is_up(interface)){

2404

int ret_errno = 0;

2405

int ioctl_errno = 0;

2406

if(not get_flags(interface, &network) and debug){

2407

ret_errno = errno;

2408

fprintf_plus(stderr, "Failed to get flags for interface "

2409

"\"%s\"\n", interface);

2410

errno = old_errno;

2411

return ret_errno;

2412

}

2413

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2414

2415

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

2416

if(sd == -1){

2417

ret_errno = errno;

2418

perror_plus("socket");

2419

errno = old_errno;

2420

return ret_errno;

2421

}

2422

2423

if(debug){

2424

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

2425

interface);

2426

}

2427

2428

/* Raise privileges */

2429

ret_errno = raise_privileges();

2430

if(ret_errno != 0){

2431

errno = ret_errno;

2432

perror_plus("Failed to raise privileges");

2433

}

2434

2435

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2436

ioctl_errno = errno;

2437

2438

/* If raise_privileges() succeeded above */

2439

if(ret_errno == 0){

2440

/* Lower privileges */

2441

ret_errno = lower_privileges();

2442

if(ret_errno != 0){

2443

errno = ret_errno;

2444

perror_plus("Failed to lower privileges");

2445

}

2446

}

2447

2448

/* Close the socket */

2449

int ret = close(sd);

2450

if(ret == -1){

2451

perror_plus("close");

2452

}

2453

2454

if(ret_setflags == -1){

2455

errno = ioctl_errno;

2456

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2457

errno = old_errno;

2458

return ioctl_errno;

2459

}

2460

} else if(debug){

2461

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

2462

interface);

2463

}

2464

2465

errno = old_errno;

2466

return 0;

1021

2467

}

1022

2468

1023

2469

int main(int argc, char *argv[]){

2470

mandos_context mc = { .server = NULL, .dh_bits = 0,

2471

#if GNUTLS_VERSION_NUMBER >= 0x030606

2472

.priority = "SECURE128:!CTYPE-X.509"

2473

":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"

2474

":%PROFILE_ULTRA",

2475

#elif GNUTLS_VERSION_NUMBER < 0x030600

2476

.priority = "SECURE256:!CTYPE-X.509"

2477

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2478

#else

2479

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

2480

#endif

2481

.current_server = NULL, .interfaces = NULL,

2482

.interfaces_size = 0 };

1024

2483

AvahiSServiceBrowser *sb = NULL;

1025

int error;

2484

error_t ret_errno;

1026

2485

int ret;

1027

2486

intmax_t tmpmax;

1028

2487

char *tmp;

1029

2488

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

char tempdir[] = "/tmp/mandosXXXXXX";

1038

bool tempdir_created = false;

2489

char *interfaces_to_take_down = NULL;

2490

size_t interfaces_to_take_down_size = 0;

2491

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

2492

char old_tempdir[] = "/tmp/mandosXXXXXX";

2493

char *tempdir = NULL;

1039

2494

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

2495

const char *seckey = PATHDIR "/" SECKEY;

1041

2496

const char *pubkey = PATHDIR "/" PUBKEY;

2497

#if GNUTLS_VERSION_NUMBER >= 0x030606

2498

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2499

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2500

#endif

2501

const char *dh_params_file = NULL;

2502

char *interfaces_hooks = NULL;

1042

2503

1043

2504

bool gnutls_initialized = false;

1044

2505

bool gpgme_initialized = false;

1045

2506

float delay = 2.5f;

2507

double retry_interval = 10; /* 10s between trying a server and

2508

retrying the same server again */

1046

2509

1047

2510

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

2511

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

2517

errno = 0;

1055

2518

ret = setgid(gid);

1056

2519

if(ret == -1){

1057

perror("setgid");

2520

perror_plus("setgid");

1058

2521

}

1059

2522

1060

2523

/* Lower user privileges (temporarily) */

1061

2524

errno = 0;

1062

2525

ret = seteuid(uid);

1063

2526

if(ret == -1){

1064

perror("seteuid");

2527

perror_plus("seteuid");

1065

2528

}

1066

2529

1067

2530

if(quit_now){

1088

2551

{ .name = "pubkey", .key = 'p',

1089

2552

.arg = "FILE",

1090

2553

.doc = "OpenPGP public key file base name",

1091

.group = 2 },

2554

.group = 1 },

2555

{ .name = "tls-privkey", .key = 't',

2556

.arg = "FILE",

2557

#if GNUTLS_VERSION_NUMBER >= 0x030606

2558

.doc = "TLS private key file base name",

2559

#else

2560

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2561

#endif

2562

.group = 1 },

2563

{ .name = "tls-pubkey", .key = 'T',

2564

.arg = "FILE",

2565

#if GNUTLS_VERSION_NUMBER >= 0x030606

2566

.doc = "TLS public key file base name",

2567

#else

2568

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2569

#endif

2570

.group = 1 },

1092

2571

{ .name = "dh-bits", .key = 129,

1093

2572

.arg = "BITS",

1094

2573

.doc = "Bit length of the prime number used in the"

1095

2574

" Diffie-Hellman key exchange",

1096

2575

.group = 2 },

2576

{ .name = "dh-params", .key = 134,

2577

.arg = "FILE",

2578

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2579

" for the Diffie-Hellman key exchange",

2580

.group = 2 },

1097

2581

{ .name = "priority", .key = 130,

1098

2582

.arg = "STRING",

1099

2583

.doc = "GnuTLS priority string for the TLS handshake",

1102

2586

.arg = "SECONDS",

1103

2587

.doc = "Maximum delay to wait for interface startup",

1104

2588

.group = 2 },

2589

{ .name = "retry", .key = 132,

2590

.arg = "SECONDS",

2591

.doc = "Retry interval used when denied by the Mandos server",

2592

.group = 2 },

2593

{ .name = "network-hook-dir", .key = 133,

2594

.arg = "DIR",

2595

.doc = "Directory where network hooks are located",

2596

.group = 2 },

1105

2597

/*

1106

2598

* These reproduce what we would get without ARGP_NO_HELP

1107

2599

*/

1125

2617

connect_to = arg;

1126

2618

break;

1127

2619

case 'i': /* --interface */

1128

interface = arg;

2620

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

2621

arg, (int)',');

2622

if(ret_errno != 0){

2623

argp_error(state, "%s", strerror(ret_errno));

2624

}

1129

2625

break;

1130

2626

case 's': /* --seckey */

1131

2627

seckey = arg;

1133

2629

case 'p': /* --pubkey */

1134

2630

pubkey = arg;

1135

2631

break;

2632

case 't': /* --tls-privkey */

2633

#if GNUTLS_VERSION_NUMBER >= 0x030606

2634

tls_privkey = arg;

2635

#endif

2636

break;

2637

case 'T': /* --tls-pubkey */

2638

#if GNUTLS_VERSION_NUMBER >= 0x030606

2639

tls_pubkey = arg;

2640

#endif

2641

break;

1136

2642

case 129: /* --dh-bits */

1137

2643

errno = 0;

1138

2644

tmpmax = strtoimax(arg, &tmp, 10);

1142

2648

}

1143

2649

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1144

2650

break;

2651

case 134: /* --dh-params */

2652

dh_params_file = arg;

2653

break;

1145

2654

case 130: /* --priority */

1146

2655

mc.priority = arg;

1147

2656

break;

1151

2660

if(errno != 0 or tmp == arg or *tmp != '\0'){

1152

2661

argp_error(state, "Bad delay");

1153

2662

}

2663

case 132: /* --retry */

2664

errno = 0;

2665

retry_interval = strtod(arg, &tmp);

2666

if(errno != 0 or tmp == arg or *tmp != '\0'

2667

or (retry_interval * 1000) > INT_MAX

2668

or retry_interval < 0){

2669

argp_error(state, "Bad retry interval");

2670

}

2671

break;

2672

case 133: /* --network-hook-dir */

2673

hookdir = arg;

1154

2674

break;

1155

2675

/*

1156

2676

* These reproduce what we would get without ARGP_NO_HELP

1159

2679

argp_state_help(state, state->out_stream,

1160

2680

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1161

2681

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2682

__builtin_unreachable();

1162

2683

case -3: /* --usage */

1163

2684

argp_state_help(state, state->out_stream,

1164

2685

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2686

__builtin_unreachable();

1165

2687

case 'V': /* --version */

1166

fprintf(state->out_stream, "%s\n", argp_program_version);

2688

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

1167

2689

exit(argp_err_exit_status);

1168

2690

break;

1169

2691

default:

1176

2698

.args_doc = "",

1177

2699

.doc = "Mandos client -- Get and decrypt"

1178

2700

" passwords from a Mandos server" };

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

2701

ret_errno = argp_parse(&argp, argc, argv,

2702

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2703

switch(ret_errno){

1182

2704

case 0:

1183

2705

break;

1184

2706

case ENOMEM:

1185

2707

default:

1186

errno = ret;

1187

perror("argp_parse");

2708

errno = ret_errno;

2709

perror_plus("argp_parse");

1188

2710

exitcode = EX_OSERR;

1189

2711

goto end;

1190

2712

case EINVAL:

1193

2715

}

1194

2716

}

1195

2717

2718

{

2719

/* Work around Debian bug #633582:

2720

<https://bugs.debian.org/633582> */

2721

2722

/* Re-raise privileges */

2723

ret = raise_privileges();

2724

if(ret != 0){

2725

errno = ret;

2726

perror_plus("Failed to raise privileges");

2727

} else {

2728

struct stat st;

2729

2730

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2731

int seckey_fd = open(seckey, O_RDONLY);

2732

if(seckey_fd == -1){

2733

perror_plus("open");

2734

} else {

2735

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

2736

if(ret == -1){

2737

perror_plus("fstat");

2738

} else {

2739

if(S_ISREG(st.st_mode)

2740

and st.st_uid == 0 and st.st_gid == 0){

2741

ret = fchown(seckey_fd, uid, gid);

2742

if(ret == -1){

2743

perror_plus("fchown");

2744

}

2745

}

2746

}

2747

close(seckey_fd);

2748

}

2749

}

2750

2751

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2752

int pubkey_fd = open(pubkey, O_RDONLY);

2753

if(pubkey_fd == -1){

2754

perror_plus("open");

2755

} else {

2756

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

2757

if(ret == -1){

2758

perror_plus("fstat");

2759

} else {

2760

if(S_ISREG(st.st_mode)

2761

and st.st_uid == 0 and st.st_gid == 0){

2762

ret = fchown(pubkey_fd, uid, gid);

2763

if(ret == -1){

2764

perror_plus("fchown");

2765

}

2766

}

2767

}

2768

close(pubkey_fd);

2769

}

2770

}

2771

2772

if(dh_params_file != NULL

2773

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2774

int dhparams_fd = open(dh_params_file, O_RDONLY);

2775

if(dhparams_fd == -1){

2776

perror_plus("open");

2777

} else {

2778

ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));

2779

if(ret == -1){

2780

perror_plus("fstat");

2781

} else {

2782

if(S_ISREG(st.st_mode)

2783

and st.st_uid == 0 and st.st_gid == 0){

2784

ret = fchown(dhparams_fd, uid, gid);

2785

if(ret == -1){

2786

perror_plus("fchown");

2787

}

2788

}

2789

}

2790

close(dhparams_fd);

2791

}

2792

}

2793

2794

/* Lower privileges */

2795

ret = lower_privileges();

2796

if(ret != 0){

2797

errno = ret;

2798

perror_plus("Failed to lower privileges");

2799

}

2800

}

2801

}

2802

2803

/* Remove invalid interface names (except "none") */

2804

{

2805

char *interface = NULL;

2806

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2807

interface))){

2808

if(strcmp(interface, "none") != 0

2809

and if_nametoindex(interface) == 0){

2810

if(interface[0] != '\0'){

2811

fprintf_plus(stderr, "Not using nonexisting interface"

2812

" \"%s\"\n", interface);

2813

}

2814

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2815

interface = NULL;

2816

}

2817

}

2818

}

2819

2820

/* Run network hooks */

2821

{

2822

if(mc.interfaces != NULL){

2823

interfaces_hooks = malloc(mc.interfaces_size);

2824

if(interfaces_hooks == NULL){

2825

perror_plus("malloc");

2826

goto end;

2827

}

2828

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2829

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2830

}

2831

run_network_hooks("start", interfaces_hooks != NULL ?

2832

interfaces_hooks : "", delay);

2833

}

2834

1196

2835

if(not debug){

1197

2836

avahi_set_log_function(empty_log);

1198

2837

}

1201

2840

from the signal handler */

1202

2841

/* Initialize the pseudo-RNG for Avahi */

1203

2842

srand((unsigned int) time(NULL));

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

2843

simple_poll = avahi_simple_poll_new();

2844

if(simple_poll == NULL){

2845

fprintf_plus(stderr,

2846

"Avahi: Failed to create simple poll object.\n");

1207

2847

exitcode = EX_UNAVAILABLE;

1208

2848

goto end;

1209

2849

}

1211

2851

sigemptyset(&sigterm_action.sa_mask);

1212

2852

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1213

2853

if(ret == -1){

1214

perror("sigaddset");

2854

perror_plus("sigaddset");

1215

2855

exitcode = EX_OSERR;

1216

2856

goto end;

1217

2857

}

1218

2858

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1219

2859

if(ret == -1){

1220

perror("sigaddset");

2860

perror_plus("sigaddset");

1221

2861

exitcode = EX_OSERR;

1222

2862

goto end;

1223

2863

}

1224

2864

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1225

2865

if(ret == -1){

1226

perror("sigaddset");

2866

perror_plus("sigaddset");

1227

2867

exitcode = EX_OSERR;

1228

2868

goto end;

1229

2869

}

1233

2873

*/

1234

2874

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1235

2875

if(ret == -1){

1236

perror("sigaction");

2876

perror_plus("sigaction");

1237

2877

return EX_OSERR;

1238

2878

}

1239

2879

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2880

ret = sigaction(SIGINT, &sigterm_action, NULL);

1241

2881

if(ret == -1){

1242

perror("sigaction");

2882

perror_plus("sigaction");

1243

2883

exitcode = EX_OSERR;

1244

2884

goto end;

1245

2885

}

1246

2886

}

1247

2887

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1248

2888

if(ret == -1){

1249

perror("sigaction");

2889

perror_plus("sigaction");

1250

2890

return EX_OSERR;

1251

2891

}

1252

2892

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2893

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1254

2894

if(ret == -1){

1255

perror("sigaction");

2895

perror_plus("sigaction");

1256

2896

exitcode = EX_OSERR;

1257

2897

goto end;

1258

2898

}

1259

2899

}

1260

2900

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1261

2901

if(ret == -1){

1262

perror("sigaction");

2902

perror_plus("sigaction");

1263

2903

return EX_OSERR;

1264

2904

}

1265

2905

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2906

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1267

2907

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

1273

1274

/* If the interface is down, bring it up */

1275

if(interface[0] != '\0'){

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

fprintf(stderr, "No such interface: \"%s\"\n", interface);

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

messages about the network interface to mess up the prompt */

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

strcpy(network.ifr_name, interface);

1326

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

if((network.ifr_flags & IFF_UP) == 0){

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

2908

perror_plus("sigaction");

2909

exitcode = EX_OSERR;

2910

goto end;

2911

}

2912

}

2913

2914

/* If no interfaces were specified, make a list */

2915

if(mc.interfaces == NULL){

2916

struct dirent **direntries = NULL;

2917

/* Look for any good interfaces */

2918

ret = scandir(sys_class_net, &direntries, good_interface,

2919

alphasort);

2920

if(ret >= 1){

2921

/* Add all found interfaces to interfaces list */

2922

for(int i = 0; i < ret; ++i){

2923

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2924

direntries[i]->d_name);

2925

if(ret_errno != 0){

2926

errno = ret_errno;

2927

perror_plus("argz_add");

2928

free(direntries[i]);

2929

continue;

2930

}

2931

if(debug){

2932

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2933

direntries[i]->d_name);

2934

}

2935

free(direntries[i]);

2936

}

2937

free(direntries);

2938

} else {

2939

if(ret == 0){

2940

free(direntries);

2941

}

2942

fprintf_plus(stderr, "Could not find a network interface\n");

2943

exitcode = EXIT_FAILURE;

2944

goto end;

2945

}

2946

}

2947

2948

/* Bring up interfaces which are down, and remove any "none"s */

2949

{

2950

char *interface = NULL;

2951

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2952

interface))){

2953

/* If interface name is "none", stop bringing up interfaces.

2954

Also remove all instances of "none" from the list */

2955

if(strcmp(interface, "none") == 0){

2956

argz_delete(&mc.interfaces, &mc.interfaces_size,

2957

interface);

2958

interface = NULL;

2959

while((interface = argz_next(mc.interfaces,

2960

mc.interfaces_size, interface))){

2961

if(strcmp(interface, "none") == 0){

2962

argz_delete(&mc.interfaces, &mc.interfaces_size,

2963

interface);

2964

interface = NULL;

1359

2965

}

1360

2966

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

for(int i=0; i < delay * 4; i++){

1373

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

2967

break;

1378

2968

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

if(ret == -1 and errno != EINTR){

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

/* We won't need the socket anymore */

1387

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2969

bool interface_was_up = interface_is_up(interface);

2970

errno = bring_up_interface(interface, delay);

2971

if(not interface_was_up){

2972

if(errno != 0){

2973

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2974

" %s\n", interface, strerror(errno));

2975

} else {

2976

errno = argz_add(&interfaces_to_take_down,

2977

&interfaces_to_take_down_size,

2978

interface);

2979

if(errno != 0){

2980

perror_plus("argz_add");

2981

}

2982

}

2983

}

2984

}

2985

if(debug and (interfaces_to_take_down == NULL)){

2986

fprintf_plus(stderr, "No interfaces were brought up\n");

2987

}

2988

}

2989

2990

/* If we only got one interface, explicitly use only that one */

2991

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2992

if(debug){

2993

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2994

mc.interfaces);

2995

}

2996

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1416

2997

}

1417

2998

1418

2999

if(quit_now){

1419

3000

goto end;

1420

3001

}

1421

3002

1422

ret = init_gnutls_global(pubkey, seckey);

3003

#if GNUTLS_VERSION_NUMBER >= 0x030606

3004

ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);

3005

#elif GNUTLS_VERSION_NUMBER < 0x030600

3006

ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);

3007

#else

3008

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

3009

#endif

1423

3010

if(ret == -1){

1424

fprintf(stderr, "init_gnutls_global failed\n");

3011

fprintf_plus(stderr, "init_gnutls_global failed\n");

1425

3012

exitcode = EX_UNAVAILABLE;

1426

3013

goto end;

1427

3014

} else {

1432

3019

goto end;

1433

3020

}

1434

3021

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

3022

/* Try /run/tmp before /tmp */

3023

tempdir = mkdtemp(run_tempdir);

3024

if(tempdir == NULL and errno == ENOENT){

3025

if(debug){

3026

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

3027

run_tempdir, old_tempdir);

3028

}

3029

tempdir = mkdtemp(old_tempdir);

3030

}

3031

if(tempdir == NULL){

3032

perror_plus("mkdtemp");

1439

3033

goto end;

1440

3034

}

1441

3035

1443

3037

goto end;

1444

3038

}

1445

3039

1446

if(not init_gpgme(pubkey, seckey, tempdir)){

1447

fprintf(stderr, "init_gpgme failed\n");

3040

if(not init_gpgme(pubkey, seckey, tempdir, &mc)){

3041

fprintf_plus(stderr, "init_gpgme failed\n");

1448

3042

exitcode = EX_UNAVAILABLE;

1449

3043

goto end;

1450

3044

} else {

1459

3053

/* Connect directly, do not use Zeroconf */

1460

3054

/* (Mainly meant for debugging) */

1461

3055

char *address = strrchr(connect_to, ':');

3056

1462

3057

if(address == NULL){

1463

fprintf(stderr, "No colon in address\n");

3058

fprintf_plus(stderr, "No colon in address\n");

1464

3059

exitcode = EX_USAGE;

1465

3060

goto end;

1466

3061

}

1469

3064

goto end;

1470

3065

}

1471

3066

1472

uint16_t port;

3067

in_port_t port;

1473

3068

errno = 0;

1474

3069

tmpmax = strtoimax(address+1, &tmp, 10);

1475

3070

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1476

or tmpmax != (uint16_t)tmpmax){

1477

fprintf(stderr, "Bad port number\n");

3071

or tmpmax != (in_port_t)tmpmax){

3072

fprintf_plus(stderr, "Bad port number\n");

1478

3073

exitcode = EX_USAGE;

1479

3074

goto end;

1480

3075

}

1481

3076

1482

3077

if(quit_now){

1483

3078

goto end;

1484

3079

}

1485

3080

1486

port = (uint16_t)tmpmax;

3081

port = (in_port_t)tmpmax;

1487

3082

*address = '\0';

1488

address = connect_to;

1489

3083

/* Colon in address indicates IPv6 */

1490

3084

int af;

1491

if(strchr(address, ':') != NULL){

3085

if(strchr(connect_to, ':') != NULL){

1492

3086

af = AF_INET6;

3087

/* Accept [] around IPv6 address - see RFC 5952 */

3088

if(connect_to[0] == '[' and address[-1] == ']')

3089

{

3090

connect_to++;

3091

address[-1] = '\0';

3092

}

1493

3093

} else {

1494

3094

af = AF_INET;

1495

3095

}

3096

address = connect_to;

1496

3097

1497

3098

if(quit_now){

1498

3099

goto end;

1499

3100

}

1500

3101

1501

ret = start_mandos_communication(address, port, if_index, af);

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

3102

while(not quit_now){

3103

ret = start_mandos_communication(address, port, if_index, af,

3104

&mc);

3105

if(quit_now or ret == 0){

3106

break;

3107

}

3108

if(debug){

3109

fprintf_plus(stderr, "Retrying in %d seconds\n",

3110

(int)retry_interval);

3111

}

3112

sleep((unsigned int)retry_interval);

3113

}

3114

3115

if(not quit_now){

1523

3116

exitcode = EXIT_SUCCESS;

1524

3117

}

3118

1525

3119

goto end;

1526

3120

}

1527

3121

1539

3133

config.publish_domain = 0;

1540

3134

1541

3135

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

3136

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3137

&config, NULL, NULL, &ret);

1545

3138

1546

3139

/* Free the Avahi configuration data */

1547

3140

avahi_server_config_free(&config);

1549

3142

1550

3143

/* Check if creating the Avahi server object succeeded */

1551

3144

if(mc.server == NULL){

1552

fprintf(stderr, "Failed to create Avahi server: %s\n",

1553

avahi_strerror(error));

3145

fprintf_plus(stderr, "Failed to create Avahi server: %s\n",

3146

avahi_strerror(ret));

1554

3147

exitcode = EX_UNAVAILABLE;

1555

3148

goto end;

1556

3149

}

1562

3155

/* Create the Avahi service browser */

1563

3156

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

3157

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

3158

NULL, 0, browse_callback,

3159

(void *)&mc);

1566

3160

if(sb == NULL){

1567

fprintf(stderr, "Failed to create service browser: %s\n",

1568

avahi_strerror(avahi_server_errno(mc.server)));

3161

fprintf_plus(stderr, "Failed to create service browser: %s\n",

3162

avahi_strerror(avahi_server_errno(mc.server)));

1569

3163

exitcode = EX_UNAVAILABLE;

1570

3164

goto end;

1571

3165

}

1577

3171

/* Run the main loop */

1578

3172

1579

3173

if(debug){

1580

fprintf(stderr, "Starting Avahi loop search\n");

3174

fprintf_plus(stderr, "Starting Avahi loop search\n");

1581

3175

}

1582

3176

1583

avahi_simple_poll_loop(mc.simple_poll);

3177

ret = avahi_loop_with_timeout(simple_poll,

3178

(int)(retry_interval * 1000), &mc);

3179

if(debug){

3180

fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",

3181

(ret == 0) ? "successfully" : "with error");

3182

}

1584

3183

1585

3184

end:

1586

3185

1587

3186

if(debug){

1588

fprintf(stderr, "%s exiting\n", argv[0]);

3187

if(signal_received){

3188

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

3189

argv[0], signal_received,

3190

strsignal(signal_received));

3191

} else {

3192

fprintf_plus(stderr, "%s exiting\n", argv[0]);

3193

}

1589

3194

}

1590

3195

1591

3196

/* Cleanup things */

3197

free(mc.interfaces);

3198

1592

3199

if(sb != NULL)

1593

3200

avahi_s_service_browser_free(sb);

1594

3201

1595

3202

if(mc.server != NULL)

1596

3203

avahi_server_free(mc.server);

1597

3204

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

3205

if(simple_poll != NULL)

3206

avahi_simple_poll_free(simple_poll);

1600

3207

1601

3208

if(gnutls_initialized){

1602

3209

gnutls_certificate_free_credentials(mc.cred);

1603

gnutls_global_deinit();

1604

3210

gnutls_dh_params_deinit(mc.dh_params);

1605

3211

}

1606

3212

1608

3214

gpgme_release(mc.ctx);

1609

3215

}

1610

3216

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1625

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

/* Skip "." and ".." */

1659

if(direntry->d_name[0] == '.'

1660

and (direntry->d_name[1] == '\0'

1661

or (direntry->d_name[1] == '.'

1662

and direntry->d_name[2] == '\0'))){

1663

continue;

1664

}

1665

char *fullname = NULL;

1666

ret = asprintf(&fullname, "%s/%s", tempdir,

1667

direntry->d_name);

1668

if(ret < 0){

1669

perror("asprintf");

1670

continue;

1671

}

1672

ret = remove(fullname);

1673

if(ret == -1){

1674

fprintf(stderr, "remove(\"%s\"): %s\n", fullname,

1675

strerror(errno));

1676

}

1677

free(fullname);

1678

}

1679

closedir(d);

1680

}

1681

ret = rmdir(tempdir);

1682

if(ret == -1 and errno != ENOENT){

1683

perror("rmdir");

1684

}

3217

/* Cleans up the circular linked list of Mandos servers the client

3218

has seen */

3219

if(mc.current_server != NULL){

3220

mc.current_server->prev->next = NULL;

3221

while(mc.current_server != NULL){

3222

server *next = mc.current_server->next;

3223

#ifdef __GNUC__

3224

#pragma GCC diagnostic push

3225

#pragma GCC diagnostic ignored "-Wcast-qual"

3226

#endif

3227

free((char *)(mc.current_server->ip));

3228

#ifdef __GNUC__

3229

#pragma GCC diagnostic pop

3230

#endif

3231

free(mc.current_server);

3232

mc.current_server = next;

3233

}

3234

}

3235

3236

/* Re-raise privileges */

3237

{

3238

ret = raise_privileges();

3239

if(ret != 0){

3240

errno = ret;

3241

perror_plus("Failed to raise privileges");

3242

} else {

3243

3244

/* Run network hooks */

3245

run_network_hooks("stop", interfaces_hooks != NULL ?

3246

interfaces_hooks : "", delay);

3247

3248

/* Take down the network interfaces which were brought up */

3249

{

3250

char *interface = NULL;

3251

while((interface = argz_next(interfaces_to_take_down,

3252

interfaces_to_take_down_size,

3253

interface))){

3254

ret = take_down_interface(interface);

3255

if(ret != 0){

3256

errno = ret;

3257

perror_plus("Failed to take down interface");

3258

}

3259

}

3260

if(debug and (interfaces_to_take_down == NULL)){

3261

fprintf_plus(stderr, "No interfaces needed to be taken"

3262

" down\n");

3263

}

3264

}

3265

}

3266

3267

ret = lower_privileges_permanently();

3268

if(ret != 0){

3269

errno = ret;

3270

perror_plus("Failed to lower privileges permanently");

3271

}

3272

}

3273

3274

free(interfaces_to_take_down);

3275

free(interfaces_hooks);

3276

3277

void clean_dir_at(int base, const char * const dirname,

3278

uintmax_t level){

3279

struct dirent **direntries = NULL;

3280

int dret;

3281

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3282

O_RDONLY

3283

| O_NOFOLLOW

3284

| O_DIRECTORY

3285

| O_PATH));

3286

if(dir_fd == -1){

3287

perror_plus("open");

3288

return;

3289

}

3290

int numentries = scandirat(dir_fd, ".", &direntries,

3291

notdotentries, alphasort);

3292

if(numentries >= 0){

3293

for(int i = 0; i < numentries; i++){

3294

if(debug){

3295

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3296

dirname, direntries[i]->d_name);

3297

}

3298

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3299

if(dret == -1){

3300

if(errno == EISDIR){

3301

dret = unlinkat(dir_fd, direntries[i]->d_name,

3302

AT_REMOVEDIR);

3303

}

3304

if((dret == -1) and (errno == ENOTEMPTY)

3305

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3306

== 0) and (level == 0)){

3307

/* Recurse only in this special case */

3308

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3309

dret = 0;

3310

}

3311

if((dret == -1) and (errno != ENOENT)){

3312

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3313

direntries[i]->d_name, strerror(errno));

3314

}

3315

}

3316

free(direntries[i]);

3317

}

3318

3319

/* need to clean even if 0 because man page doesn't specify */

3320

free(direntries);

3321

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3322

if(dret == -1 and errno != ENOENT){

3323

perror_plus("rmdir");

3324

}

3325

} else {

3326

perror_plus("scandirat");

3327

}

3328

close(dir_fd);

3329

}

3330

3331

/* Removes the GPGME temp directory and all files inside */

3332

if(tempdir != NULL){

3333

clean_dir_at(-1, tempdir, 0);

1685

3334

}

1686

3335

1687

3336

if(quit_now){

1691

3340

&old_sigterm_action,

1692

3341

NULL));

1693

3342

if(ret == -1){

1694

perror("sigaction");

3343

perror_plus("sigaction");

1695

3344

}

1696

3345

do {

1697

3346

ret = raise(signal_received);

1698

3347

} while(ret != 0 and errno == EINTR);

1699

3348

if(ret != 0){

1700

perror("raise");

3349

perror_plus("raise");

1701

3350

abort();

1702

3351

}

1703

3352

TEMP_FAILURE_RETRY(pause());