/mandos/trunk : revision 24.1.150

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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 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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*

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

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* along with this program. If not, see

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

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*

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

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* Contact the authors at <mandos@fukt.bsnet.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 /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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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() */

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

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stdout, ferror(), remove() */

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#include <stdint.h> /* uint16_t, uint32_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> /* strcmp(), strlen(), strerror(),

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asprintf(), strncpy(), strsignal()

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*/

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

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

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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(), S_ISREG */

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

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

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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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inet_pton(), connect() */

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

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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 <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 <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 <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(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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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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#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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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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

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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 so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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if(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;

288

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))

297

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;

303

}

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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))

313

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;

327

int ret = 0;

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

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ret = errno;

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}

331

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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*/

338

__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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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

347

177

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

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*/

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bool import_key(const char * const filename){

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bool import_key(const char *filename){

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int ret;

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int fd;

352

182

gpgme_data_t pgp_data;

353

183

354

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

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if(fd == -1){

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perror_plus("open");

186

perror("open");

357

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return false;

358

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}

359

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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

410

190

rc = gpgme_data_new_from_fd(&pgp_data, fd);

411

191

if(rc != GPG_ERR_NO_ERROR){

412

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

413

gpgme_strsource(rc), gpgme_strerror(rc));

192

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

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gpgme_strsource(rc), gpgme_strerror(rc));

414

194

return false;

415

195

}

416

196

417

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

197

rc = gpgme_op_import(mc.ctx, pgp_data);

418

198

if(rc != GPG_ERR_NO_ERROR){

419

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

420

gpgme_strsource(rc), gpgme_strerror(rc));

199

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

200

gpgme_strsource(rc), gpgme_strerror(rc));

421

201

return false;

422

202

}

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

}

498

203

499

ret = close(fd);

204

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

500

205

if(ret == -1){

501

perror_plus("close");

206

perror("close");

502

207

}

503

208

gpgme_data_release(pgp_data);

504

209

return true;

505

210

}

506

211

507

212

if(debug){

508

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

213

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

509

214

}

510

215

511

216

/* Init GPGME */

512

217

gpgme_check_version(NULL);

513

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

514

219

if(rc != GPG_ERR_NO_ERROR){

515

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

516

gpgme_strsource(rc), gpgme_strerror(rc));

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

517

222

return false;

518

223

}

519

224

520

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

225

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

521

226

rc = gpgme_get_engine_info(&engine_info);

522

227

if(rc != GPG_ERR_NO_ERROR){

523

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

524

gpgme_strsource(rc), gpgme_strerror(rc));

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

525

230

return false;

526

231

}

527

232

while(engine_info != NULL){

533

238

engine_info = engine_info->next;

534

239

}

535

240

if(engine_info == NULL){

536

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

537

tempdir);

241

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

538

242

return false;

539

243

}

540

244

541

245

/* Create new GPGME "context" */

542

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

246

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

543

247

if(rc != GPG_ERR_NO_ERROR){

544

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

545

gpgme_strsource(rc), gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

546

250

return false;

547

251

}

548

252

557

261

* Decrypt OpenPGP data.

558

262

* Returns -1 on error

559

263

*/

560

__attribute__((nonnull, warn_unused_result))

561

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

562

265

size_t crypto_size,

563

char **plaintext,

564

mandos_context *mc){

266

char **plaintext){

565

267

gpgme_data_t dh_crypto, dh_plain;

566

268

gpgme_error_t rc;

567

269

ssize_t ret;

569

271

ssize_t plaintext_length = 0;

570

272

571

273

if(debug){

572

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

274

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

573

275

}

574

276

575

277

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

576

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

577

279

0);

578

280

if(rc != GPG_ERR_NO_ERROR){

579

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

580

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

581

283

return -1;

582

284

}

583

285

584

286

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

585

287

rc = gpgme_data_new(&dh_plain);

586

288

if(rc != GPG_ERR_NO_ERROR){

587

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

588

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

589

291

gpgme_data_release(dh_crypto);

590

292

return -1;

591

293

}

592

294

593

295

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

594

296

data buffer */

595

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

297

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

596

298

if(rc != GPG_ERR_NO_ERROR){

597

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

598

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

599

301

plaintext_length = -1;

600

302

if(debug){

601

303

gpgme_decrypt_result_t result;

602

result = gpgme_op_decrypt_result(mc->ctx);

304

result = gpgme_op_decrypt_result(mc.ctx);

603

305

if(result == NULL){

604

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

306

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

605

307

} else {

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");

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

612

312

if(result->file_name != NULL){

613

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

313

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

614

314

}

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");

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;

623

325

}

624

326

}

625

327

}

627

329

}

628

330

629

331

if(debug){

630

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

332

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

631

333

}

632

334

633

335

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

634

336

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

635

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

636

338

plaintext_length = -1;

637

339

goto decrypt_end;

638

340

}

640

342

*plaintext = NULL;

641

343

while(true){

642

344

plaintext_capacity = incbuffer(plaintext,

643

(size_t)plaintext_length,

644

plaintext_capacity);

345

(size_t)plaintext_length,

346

plaintext_capacity);

645

347

if(plaintext_capacity == 0){

646

perror_plus("incbuffer");

647

plaintext_length = -1;

648

goto decrypt_end;

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

649

351

}

650

352

651

353

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

656

358

break;

657

359

}

658

360

if(ret < 0){

659

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

660

362

plaintext_length = -1;

661

363

goto decrypt_end;

662

364

}

664

366

}

665

367

666

368

if(debug){

667

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

369

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

668

370

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

669

371

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

670

372

}

681

383

return plaintext_length;

682

384

}

683

385

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);

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;

695

392

}

696

393

697

394

/* GnuTLS log function callback */

698

__attribute__((nonnull))

699

395

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

700

396

const char* string){

701

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

397

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

702

398

}

703

399

704

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

705

400

static int init_gnutls_global(const char *pubkeyfilename,

706

const char *seckeyfilename,

707

const char *dhparamsfilename,

708

mandos_context *mc){

401

const char *seckeyfilename){

709

402

int ret;

710

403

711

404

if(debug){

712

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

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;

713

413

}

714

414

715

415

if(debug){

721

421

}

722

422

723

423

/* OpenPGP credentials */

724

ret = gnutls_certificate_allocate_credentials(&mc->cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

725

425

if(ret != GNUTLS_E_SUCCESS){

726

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

727

safer_gnutls_strerror(ret));

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();

728

432

return -1;

729

433

}

730

434

731

435

if(debug){

732

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

733

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

734

pubkeyfilename,

735

seckeyfilename);

436

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

437

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

438

seckeyfilename);

736

439

}

737

440

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

751

441

ret = gnutls_certificate_set_openpgp_key_file

752

(mc->cred, pubkeyfilename, seckeyfilename,

442

(mc.cred, pubkeyfilename, seckeyfilename,

753

443

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

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

756

#endif

757

444

if(ret != GNUTLS_E_SUCCESS){

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));

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));

763

450

goto globalfail;

764

451

}

765

452

766

453

/* GnuTLS server initialization */

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

}

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);

956

468

957

469

return 0;

958

470

959

471

globalfail:

960

472

961

gnutls_certificate_free_credentials(mc->cred);

962

gnutls_dh_params_deinit(mc->dh_params);

473

gnutls_certificate_free_credentials(mc.cred);

474

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

963

476

return -1;

964

477

}

965

478

966

__attribute__((nonnull, warn_unused_result))

967

static int init_gnutls_session(gnutls_session_t *session,

968

mandos_context *mc){

479

static int init_gnutls_session(gnutls_session_t *session){

969

480

int ret;

970

481

/* GnuTLS session creation */

971

482

do {

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

));

483

ret = gnutls_init(session, GNUTLS_SERVER);

980

484

if(quit_now){

981

485

return -1;

982

486

}

983

487

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

984

488

if(ret != GNUTLS_E_SUCCESS){

985

fprintf_plus(stderr,

986

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

987

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

988

491

}

989

492

990

493

{

991

494

const char *err;

992

495

do {

993

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

496

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

994

497

if(quit_now){

995

498

gnutls_deinit(*session);

996

499

return -1;

997

500

}

998

501

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

999

502

if(ret != GNUTLS_E_SUCCESS){

1000

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

1001

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

1002

safer_gnutls_strerror(ret));

503

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

504

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

505

safer_gnutls_strerror(ret));

1003

506

gnutls_deinit(*session);

1004

507

return -1;

1005

508

}

1007

510

1008

511

do {

1009

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

1010

mc->cred);

513

mc.cred);

1011

514

if(quit_now){

1012

515

gnutls_deinit(*session);

1013

516

return -1;

1014

517

}

1015

518

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

1016

519

if(ret != GNUTLS_E_SUCCESS){

1017

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

1018

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

1019

522

gnutls_deinit(*session);

1020

523

return -1;

1021

524

}

1023

526

/* ignore client certificate if any. */

1024

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

1025

528

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

1026

531

return 0;

1027

532

}

1028

533

1030

535

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

1031

536

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

1032

537

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

_exit(EX_NOPERM);

1078

}

1079

/* Reset supplementary groups */

1080

errno = 0;

1081

ret = setgroups(0, NULL);

1082

if(ret == -1){

1083

perror_plus("setgroups");

1084

_exit(EX_NOPERM);

1085

}

1086

}

1087

ret = dup2(devnull, STDIN_FILENO);

1088

if(ret == -1){

1089

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

1090

_exit(EX_OSERR);

1091

}

1092

ret = close(devnull);

1093

if(ret == -1){

1094

perror_plus("close");

1095

_exit(EX_OSERR);

1096

}

1097

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1098

if(ret == -1){

1099

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

1100

_exit(EX_OSERR);

1101

}

1102

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

1103

O_RDONLY

1104

| O_DIRECTORY

1105

| O_PATH

1106

| O_CLOEXEC));

1107

if(helperdir_fd == -1){

1108

perror_plus("open");

1109

_exit(EX_UNAVAILABLE);

1110

}

1111

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

1112

helper, O_RDONLY));

1113

if(helper_fd == -1){

1114

perror_plus("openat");

1115

close(helperdir_fd);

1116

_exit(EX_UNAVAILABLE);

1117

}

1118

close(helperdir_fd);

1119

#ifdef __GNUC__

1120

#pragma GCC diagnostic push

1121

#pragma GCC diagnostic ignored "-Wcast-qual"

1122

#endif

1123

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

1124

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

1125

interface, debug ? debug_flag : NULL, NULL },

1126

environ) == -1){

1127

#ifdef __GNUC__

1128

#pragma GCC diagnostic pop

1129

#endif

1130

perror_plus("fexecve");

1131

_exit(EXIT_FAILURE);

1132

}

1133

}

1134

if(pid == -1){

1135

perror_plus("fork");

1136

return false;

1137

}

1138

int status;

1139

pid_t pret = -1;

1140

errno = 0;

1141

do {

1142

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

1143

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

1144

int errno_raising = 0;

1145

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

1146

errno_raising = errno;

1147

perror_plus("Failed to raise privileges in order to"

1148

" kill helper program");

1149

}

1150

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

1151

perror_plus("kill");

1152

}

1153

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

1154

perror_plus("Failed to lower privileges after killing"

1155

" helper program");

1156

}

1157

return false;

1158

}

1159

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

1160

if(pret == -1){

1161

perror_plus("waitpid");

1162

return false;

1163

}

1164

if(WIFEXITED(status)){

1165

if(WEXITSTATUS(status) != 0){

1166

fprintf_plus(stderr, "Error: iprouteadddel exited"

1167

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

1168

return false;

1169

}

1170

return true;

1171

}

1172

if(WIFSIGNALED(status)){

1173

fprintf_plus(stderr, "Error: iprouteadddel died by"

1174

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

1175

return false;

1176

}

1177

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

1178

return false;

1179

}

1180

1181

__attribute__((nonnull, warn_unused_result))

1182

static bool add_local_route(const char *address,

1183

AvahiIfIndex if_index){

1184

if(debug){

1185

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

1186

}

1187

return add_delete_local_route(true, address, if_index);

1188

}

1189

1190

__attribute__((nonnull, warn_unused_result))

1191

static bool delete_local_route(const char *address,

1192

AvahiIfIndex if_index){

1193

if(debug){

1194

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

1195

}

1196

return add_delete_local_route(false, address, if_index);

1197

}

1198

1199

538

/* Called when a Mandos server is found */

1200

__attribute__((nonnull, warn_unused_result))

1201

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

539

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

1202

540

AvahiIfIndex if_index,

1203

int af, mandos_context *mc){

541

int af){

1204

542

int ret, tcp_sd = -1;

1205

543

ssize_t sret;

1206

struct sockaddr_storage to;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

1207

548

char *buffer = NULL;

1208

549

char *decrypted_buffer = NULL;

1209

550

size_t buffer_length = 0;

1212

553

int retval = -1;

1213

554

gnutls_session_t session;

1214

555

int pf; /* Protocol family */

1215

bool route_added = false;

1216

556

1217

557

errno = 0;

1218

558

1229

569

pf = PF_INET;

1230

570

break;

1231

571

default:

1232

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

572

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

1233

573

errno = EINVAL;

1234

574

return -1;

1235

575

}

1236

576

1237

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

1238

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

1239

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

1240

bool match = false;

1241

{

1242

char *interface = NULL;

1243

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

1244

mc->interfaces_size,

1245

interface))){

1246

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

1247

match = true;

1248

break;

1249

}

1250

}

1251

}

1252

if(not match){

1253

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

1254

connect to the server */

1255

if(debug){

1256

char interface[IF_NAMESIZE];

1257

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

1258

perror_plus("if_indextoname");

1259

} else {

1260

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

1261

" \"%s\"\n",

1262

if_indextoname((unsigned int)if_index,

1263

interface));

1264

}

1265

}

1266

return -1;

1267

}

1268

}

1269

1270

ret = init_gnutls_session(&session, mc);

577

ret = init_gnutls_session(&session);

1271

578

if(ret != 0){

1272

579

return -1;

1273

580

}

1274

581

1275

582

if(debug){

1276

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

1277

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

583

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

584

"\n", ip, port);

1278

585

}

1279

586

1280

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

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

1281

588

if(tcp_sd < 0){

1282

589

int e = errno;

1283

perror_plus("socket");

590

perror("socket");

1284

591

errno = e;

1285

592

goto mandos_end;

1286

593

}

1290

597

goto mandos_end;

1291

598

}

1292

599

600

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

1293

601

if(af == AF_INET6){

1294

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

1295

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

1296

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

602

to.in6.sin6_family = (sa_family_t)af;

603

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

1297

604

} else { /* IPv4 */

1298

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

1299

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

1300

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

605

to.in.sin_family = (sa_family_t)af;

606

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

1301

607

}

1302

608

if(ret < 0 ){

1303

609

int e = errno;

1304

perror_plus("inet_pton");

610

perror("inet_pton");

1305

611

errno = e;

1306

612

goto mandos_end;

1307

613

}

1308

614

if(ret == 0){

1309

615

int e = errno;

1310

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

616

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

1311

617

errno = e;

1312

618

goto mandos_end;

1313

619

}

1314

620

if(af == AF_INET6){

1315

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

1316

if(IN6_IS_ADDR_LINKLOCAL

1317

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

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*/

1318

628

if(if_index == AVAHI_IF_UNSPEC){

1319

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

1320

" incomplete without a network interface\n");

629

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

630

" without a network interface\n");

1321

631

errno = EINVAL;

1322

632

goto mandos_end;

1323

633

}

1324

634

/* Set the network interface number as scope */

1325

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

635

to.in6.sin6_scope_id = (uint32_t)if_index;

1326

636

}

1327

637

} else {

1328

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

638

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

639

-Wconversion and

640

-Wunreachable-code */

1329

641

}

1330

642

1331

643

if(quit_now){

1337

649

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

1338

650

char interface[IF_NAMESIZE];

1339

651

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

1340

perror_plus("if_indextoname");

652

perror("if_indextoname");

1341

653

} else {

1342

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

1343

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

654

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

655

ip, interface, port);

1344

656

}

1345

657

} else {

1346

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

1347

ip, (uintmax_t)port);

658

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

659

port);

1348

660

}

1349

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1350

662

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1351

if(af == AF_INET6){

1352

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

1353

sizeof(struct sockaddr_in6),

1354

addrstr, sizeof(addrstr), NULL, 0,

1355

NI_NUMERICHOST);

1356

} else {

1357

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

1358

sizeof(struct sockaddr_in),

1359

addrstr, sizeof(addrstr), NULL, 0,

1360

NI_NUMERICHOST);

1361

}

1362

if(ret == EAI_SYSTEM){

1363

perror_plus("getnameinfo");

1364

} else if(ret != 0) {

1365

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

1366

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

1367

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

1368

}

1369

}

1370

1371

if(quit_now){

1372

errno = EINTR;

1373

goto mandos_end;

1374

}

1375

1376

while(true){

1377

if(af == AF_INET6){

1378

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

1379

sizeof(struct sockaddr_in6));

1380

} else {

1381

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

1382

sizeof(struct sockaddr_in));

1383

}

1384

if(ret < 0){

1385

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

1386

and if_index != AVAHI_IF_UNSPEC

1387

and connect_to == NULL

1388

and not route_added and

1389

((af == AF_INET6 and not

1390

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1391

&to)->sin6_addr)))

1392

or (af == AF_INET and

1393

/* Not a a IPv4LL address */

1394

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

1395

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

1396

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

1397

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

1398

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

1399

connect to a Mandos server announced by Avahi on a server

1400

host with a global address. Work around this by retrying

1401

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

1402

1403

Avahi bug reference:

1404

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

1405

https://bugs.debian.org/587961

1406

*/

1407

if(debug){

1408

fprintf_plus(stderr, "Mandos server unreachable, trying"

1409

" direct route\n");

1410

}

1411

int e = errno;

1412

route_added = add_local_route(ip, if_index);

1413

if(route_added){

1414

continue;

1415

}

1416

errno = e;

1417

}

1418

if(errno != ECONNREFUSED or debug){

1419

int e = errno;

1420

perror_plus("connect");

1421

errno = e;

1422

}

1423

goto mandos_end;

1424

}

1425

1426

if(quit_now){

1427

errno = EINTR;

1428

goto mandos_end;

1429

}

1430

break;

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;

1431

700

}

1432

701

1433

702

const char *out = mandos_protocol_version;

1435

704

while(true){

1436

705

size_t out_size = strlen(out);

1437

706

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

1438

out_size - written));

707

out_size - written));

1439

708

if(ret == -1){

1440

709

int e = errno;

1441

perror_plus("write");

710

perror("write");

1442

711

errno = e;

1443

712

goto mandos_end;

1444

713

}

1461

730

}

1462

731

1463

732

if(debug){

1464

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

733

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

1465

734

}

1466

735

1467

736

if(quit_now){

1469

738

goto mandos_end;

1470

739

}

1471

740

1472

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

1473

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

1474

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

1475

gnutls_transport_set_ptr(session,

1476

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1477

742

1478

743

if(quit_now){

1479

744

errno = EINTR;

1490

755

1491

756

if(ret != GNUTLS_E_SUCCESS){

1492

757

if(debug){

1493

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

758

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

1494

759

gnutls_perror(ret);

1495

760

}

1496

761

errno = EPROTO;

1500

765

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

1501

766

1502

767

if(debug){

1503

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1504

" %s\n", ip);

768

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

769

ip);

1505

770

}

1506

771

1507

772

while(true){

1512

777

}

1513

778

1514

779

buffer_capacity = incbuffer(&buffer, buffer_length,

1515

buffer_capacity);

780

buffer_capacity);

1516

781

if(buffer_capacity == 0){

1517

782

int e = errno;

1518

perror_plus("incbuffer");

783

perror("incbuffer");

1519

784

errno = e;

1520

785

goto mandos_end;

1521

786

}

1545

810

}

1546

811

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

1547

812

if(ret < 0){

1548

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

1549

"***\n");

813

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

1550

814

gnutls_perror(ret);

1551

815

errno = EPROTO;

1552

816

goto mandos_end;

1553

817

}

1554

818

break;

1555

819

default:

1556

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

1557

" encrypted session with Mandos server\n");

820

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

821

" encrypted session with Mandos server\n");

1558

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1559

823

errno = EIO;

1560

824

goto mandos_end;

1565

829

}

1566

830

1567

831

if(debug){

1568

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

832

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

1569

833

}

1570

834

1571

835

if(quit_now){

1583

847

1584

848

if(buffer_length > 0){

1585

849

ssize_t decrypted_buffer_size;

1586

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1587

&decrypted_buffer, mc);

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1588

853

if(decrypted_buffer_size >= 0){

1589

854

1590

clearerr(stdout);

1591

855

written = 0;

1592

856

while(written < (size_t) decrypted_buffer_size){

1593

857

if(quit_now){

1601

865

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

1602

866

int e = errno;

1603

867

if(debug){

1604

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

1605

strerror(errno));

868

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

869

strerror(errno));

1606

870

}

1607

871

errno = e;

1608

872

goto mandos_end;

1609

873

}

1610

874

written += (size_t)ret;

1611

875

}

1612

ret = fflush(stdout);

1613

if(ret != 0){

1614

int e = errno;

1615

if(debug){

1616

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

1617

strerror(errno));

1618

}

1619

errno = e;

1620

goto mandos_end;

1621

}

1622

876

retval = 0;

1623

877

}

1624

878

}

1627

881

1628

882

mandos_end:

1629

883

{

1630

if(route_added){

1631

if(not delete_local_route(ip, if_index)){

1632

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

1633

" interface %d", ip, if_index);

1634

}

1635

}

1636

884

int e = errno;

1637

885

free(decrypted_buffer);

1638

886

free(buffer);

1639

887

if(tcp_sd >= 0){

1640

ret = close(tcp_sd);

888

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

1641

889

}

1642

890

if(ret == -1){

1643

891

if(e == 0){

1644

892

e = errno;

1645

893

}

1646

perror_plus("close");

894

perror("close");

1647

895

}

1648

896

gnutls_deinit(session);

1649

errno = e;

1650

897

if(quit_now){

1651

errno = EINTR;

898

e = EINTR;

1652

899

retval = -1;

1653

900

}

901

errno = e;

1654

902

}

1655

903

return retval;

1656

904

}

1668

916

AVAHI_GCC_UNUSED AvahiStringList *txt,

1669

917

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1670

918

flags,

1671

void *mc){

1672

if(r == NULL){

1673

return;

1674

}

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1675

921

1676

922

/* Called whenever a service has been resolved successfully or

1677

923

timed out */

1678

924

1679

925

if(quit_now){

1680

avahi_s_service_resolver_free(r);

1681

926

return;

1682

927

}

1683

928

1684

929

switch(event){

1685

930

default:

1686

931

case AVAHI_RESOLVER_FAILURE:

1687

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

1688

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

1689

domain,

1690

avahi_strerror(avahi_server_errno

1691

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

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)));

1692

935

break;

1693

936

1694

937

case AVAHI_RESOLVER_FOUND:

1696

939

char ip[AVAHI_ADDRESS_STR_MAX];

1697

940

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

1698

941

if(debug){

1699

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

1700

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

1701

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

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);

1702

945

}

1703

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

1704

interface,

1705

avahi_proto_to_af(proto),

1706

mc);

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1707

948

if(ret == 0){

1708

avahi_simple_poll_quit(simple_poll);

1709

} else {

1710

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

1711

avahi_proto_to_af(proto),

1712

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

1713

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

1714

" list\n", name);

1715

}

949

avahi_simple_poll_quit(mc.simple_poll);

1716

950

}

1717

951

}

1718

952

}

1728

962

const char *domain,

1729

963

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1730

964

flags,

1731

void *mc){

1732

if(b == NULL){

1733

return;

1734

}

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1735

967

1736

968

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

1737

969

is removed from the LAN */

1744

976

default:

1745

977

case AVAHI_BROWSER_FAILURE:

1746

978

1747

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

1748

avahi_strerror(avahi_server_errno

1749

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

1750

avahi_simple_poll_quit(simple_poll);

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1751

982

return;

1752

983

1753

984

case AVAHI_BROWSER_NEW:

1756

987

the callback function is called the Avahi server will free the

1757

988

resolver for us. */

1758

989

1759

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

1760

interface, protocol, name, type,

1761

domain, protocol, 0,

1762

resolve_callback, mc) == NULL)

1763

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

1764

" %s\n", name,

1765

avahi_strerror(avahi_server_errno

1766

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

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)));

1767

995

break;

1768

996

1769

997

case AVAHI_BROWSER_REMOVE:

1772

1000

case AVAHI_BROWSER_ALL_FOR_NOW:

1773

1001

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1774

1002

if(debug){

1775

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

1776

" searching...\n");

1003

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

1777

1004

}

1778

1005

break;

1779

1006

}

1780

1007

}

1781

1008

1782

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

1009

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

1783

1010

static void handle_sigterm(int sig){

1784

1011

if(quit_now){

1785

1012

return;

1787

1014

quit_now = 1;

1788

1015

signal_received = sig;

1789

1016

int old_errno = errno;

1790

/* set main loop to exit */

1791

if(simple_poll != NULL){

1792

avahi_simple_poll_quit(simple_poll);

1793

}

1794

errno = old_errno;

1795

}

1796

1797

__attribute__((nonnull, warn_unused_result))

1798

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

1799

int ret;

1800

int old_errno;

1801

1802

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

1803

if(s < 0){

1804

old_errno = errno;

1805

perror_plus("socket");

1806

errno = old_errno;

1807

return false;

1808

}

1809

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

1810

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

1811

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1812

if(ret == -1){

1813

if(debug){

1814

old_errno = errno;

1815

perror_plus("ioctl SIOCGIFFLAGS");

1816

errno = old_errno;

1817

}

1818

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

1819

old_errno = errno;

1820

perror_plus("close");

1821

errno = old_errno;

1822

}

1823

return false;

1824

}

1825

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

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1829

}

1830

return true;

1831

}

1832

1833

__attribute__((nonnull, warn_unused_result))

1834

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

1835

1836

/* Reject the loopback device */

1837

if(ifr->ifr_flags & IFF_LOOPBACK){

1838

if(debug){

1839

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

1840

ifname);

1841

}

1842

return false;

1843

}

1844

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

1845

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

1846

if(debug){

1847

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

1848

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

1849

}

1850

return true;

1851

}

1852

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

1853

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

1854

if(debug){

1855

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1856

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

1857

}

1858

return false;

1859

}

1860

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

1861

if(ifr->ifr_flags & IFF_NOARP){

1862

if(debug){

1863

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

1864

ifname);

1865

}

1866

return false;

1867

}

1868

1869

/* Accept this device */

1870

if(debug){

1871

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

1872

}

1873

return true;

1874

}

1875

1876

/*

1877

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

1878

* corresponds to an acceptable network device.

1879

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

1880

*/

1881

__attribute__((nonnull, warn_unused_result))

1882

int good_interface(const struct dirent *if_entry){

1883

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

1884

return 0;

1885

}

1886

1887

struct ifreq ifr;

1888

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

1889

if(debug){

1890

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

1891

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

1892

}

1893

return 0;

1894

}

1895

1896

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

1897

return 0;

1898

}

1899

return 1;

1900

}

1901

1902

/*

1903

* This function determines if a network interface is up.

1904

*/

1905

__attribute__((nonnull, warn_unused_result))

1906

bool interface_is_up(const char *interface){

1907

struct ifreq ifr;

1908

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

1909

if(debug){

1910

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

1911

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

1912

}

1913

return false;

1914

}

1915

1916

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

1917

}

1918

1919

/*

1920

* This function determines if a network interface is running

1921

*/

1922

__attribute__((nonnull, warn_unused_result))

1923

bool interface_is_running(const char *interface){

1924

struct ifreq ifr;

1925

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

1926

if(debug){

1927

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

1928

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

1929

}

1930

return false;

1931

}

1932

1933

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

1934

}

1935

1936

__attribute__((nonnull, pure, warn_unused_result))

1937

int notdotentries(const struct dirent *direntry){

1938

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

1939

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

1940

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

1941

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

1942

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

1943

return 0;

1944

}

1945

return 1;

1946

}

1947

1948

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

1949

__attribute__((nonnull, warn_unused_result))

1950

int runnable_hook(const struct dirent *direntry){

1951

int ret;

1952

size_t sret;

1953

struct stat st;

1954

1955

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

1956

/* Empty name? */

1957

return 0;

1958

}

1959

1960

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

1961

"abcdefghijklmnopqrstuvwxyz"

1962

"0123456789"

1963

"_.-");

1964

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

1965

/* Contains non-allowed characters */

1966

if(debug){

1967

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

1968

direntry->d_name);

1969

}

1970

return 0;

1971

}

1972

1973

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

1974

if(ret == -1){

1975

if(debug){

1976

perror_plus("Could not stat hook");

1977

}

1978

return 0;

1979

}

1980

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

1981

/* Not a regular file */

1982

if(debug){

1983

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

1984

direntry->d_name);

1985

}

1986

return 0;

1987

}

1988

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

1989

/* Not executable */

1990

if(debug){

1991

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

1992

direntry->d_name);

1993

}

1994

return 0;

1995

}

1996

if(debug){

1997

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

1998

direntry->d_name);

1999

}

2000

return 1;

2001

}

2002

2003

__attribute__((nonnull, warn_unused_result))

2004

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

2005

mandos_context *mc){

2006

int ret;

2007

struct timespec now;

2008

struct timespec waited_time;

2009

intmax_t block_time;

2010

2011

while(true){

2012

if(mc->current_server == NULL){

2013

if(debug){

2014

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

2015

" No timeout!\n");

2016

}

2017

ret = avahi_simple_poll_iterate(s, -1);

2018

} else {

2019

if(debug){

2020

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

2021

" it, or wait\n");

2022

}

2023

/* the current time */

2024

ret = clock_gettime(CLOCK_MONOTONIC, &now);

2025

if(ret == -1){

2026

perror_plus("clock_gettime");

2027

return -1;

2028

}

2029

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

2030

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

2031

waited_time.tv_sec = (now.tv_sec

2032

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

2033

waited_time.tv_nsec = (now.tv_nsec

2034

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

2035

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

2036

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

2037

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

2038

block_time = ((retry_interval

2039

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

2040

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

2041

2042

if(debug){

2043

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

2044

block_time);

2045

}

2046

2047

if(block_time <= 0){

2048

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

2049

mc->current_server->port,

2050

mc->current_server->if_index,

2051

mc->current_server->af, mc);

2052

if(ret == 0){

2053

avahi_simple_poll_quit(s);

2054

return 0;

2055

}

2056

ret = clock_gettime(CLOCK_MONOTONIC,

2057

&mc->current_server->last_seen);

2058

if(ret == -1){

2059

perror_plus("clock_gettime");

2060

return -1;

2061

}

2062

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

2063

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

2064

servers, but don't block */

2065

}

2066

2067

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

2068

}

2069

if(ret != 0){

2070

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

2071

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

2072

}

2073

}

2074

}

2075

}

2076

2077

__attribute__((nonnull))

2078

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

2079

const float delay){

2080

struct dirent **direntries = NULL;

2081

if(hookdir_fd == -1){

2082

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2083

| O_CLOEXEC);

2084

if(hookdir_fd == -1){

2085

if(errno == ENOENT){

2086

if(debug){

2087

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

2088

" found\n", hookdir);

2089

}

2090

} else {

2091

perror_plus("open");

2092

}

2093

return;

2094

}

2095

}

2096

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

2097

if(devnull == -1){

2098

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

2099

return;

2100

}

2101

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

2102

runnable_hook, alphasort);

2103

if(numhooks == -1){

2104

perror_plus("scandir");

2105

close(devnull);

2106

return;

2107

}

2108

struct dirent *direntry;

2109

int ret;

2110

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

2111

direntry = direntries[i];

2112

if(debug){

2113

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

2114

direntry->d_name);

2115

}

2116

pid_t hook_pid = fork();

2117

if(hook_pid == 0){

2118

/* Child */

2119

/* Raise privileges */

2120

errno = raise_privileges_permanently();

2121

if(errno != 0){

2122

perror_plus("Failed to raise privileges");

2123

_exit(EX_NOPERM);

2124

}

2125

/* Set group */

2126

errno = 0;

2127

ret = setgid(0);

2128

if(ret == -1){

2129

perror_plus("setgid");

2130

_exit(EX_NOPERM);

2131

}

2132

/* Reset supplementary groups */

2133

errno = 0;

2134

ret = setgroups(0, NULL);

2135

if(ret == -1){

2136

perror_plus("setgroups");

2137

_exit(EX_NOPERM);

2138

}

2139

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

2140

if(ret == -1){

2141

perror_plus("setenv");

2142

_exit(EX_OSERR);

2143

}

2144

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

2145

if(ret == -1){

2146

perror_plus("setenv");

2147

_exit(EX_OSERR);

2148

}

2149

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

2150

if(ret == -1){

2151

perror_plus("setenv");

2152

_exit(EX_OSERR);

2153

}

2154

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

2155

if(ret == -1){

2156

perror_plus("setenv");

2157

_exit(EX_OSERR);

2158

}

2159

char *delaystring;

2160

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

2161

if(ret == -1){

2162

perror_plus("asprintf");

2163

_exit(EX_OSERR);

2164

}

2165

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

2166

if(ret == -1){

2167

free(delaystring);

2168

perror_plus("setenv");

2169

_exit(EX_OSERR);

2170

}

2171

free(delaystring);

2172

if(connect_to != NULL){

2173

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

2174

if(ret == -1){

2175

perror_plus("setenv");

2176

_exit(EX_OSERR);

2177

}

2178

}

2179

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

2180

direntry->d_name,

2181

O_RDONLY));

2182

if(hook_fd == -1){

2183

perror_plus("openat");

2184

_exit(EXIT_FAILURE);

2185

}

2186

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

2187

perror_plus("close");

2188

_exit(EXIT_FAILURE);

2189

}

2190

ret = dup2(devnull, STDIN_FILENO);

2191

if(ret == -1){

2192

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

2193

_exit(EX_OSERR);

2194

}

2195

ret = close(devnull);

2196

if(ret == -1){

2197

perror_plus("close");

2198

_exit(EX_OSERR);

2199

}

2200

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2201

if(ret == -1){

2202

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

2203

_exit(EX_OSERR);

2204

}

2205

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

2206

environ) == -1){

2207

perror_plus("fexecve");

2208

_exit(EXIT_FAILURE);

2209

}

2210

} else {

2211

if(hook_pid == -1){

2212

perror_plus("fork");

2213

free(direntry);

2214

continue;

2215

}

2216

int status;

2217

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

2218

perror_plus("waitpid");

2219

free(direntry);

2220

continue;

2221

}

2222

if(WIFEXITED(status)){

2223

if(WEXITSTATUS(status) != 0){

2224

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

2225

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

2226

WEXITSTATUS(status));

2227

free(direntry);

2228

continue;

2229

}

2230

} else if(WIFSIGNALED(status)){

2231

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

2232

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

2233

WTERMSIG(status));

2234

free(direntry);

2235

continue;

2236

} else {

2237

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

2238

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

2239

free(direntry);

2240

continue;

2241

}

2242

}

2243

if(debug){

2244

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

2245

direntry->d_name);

2246

}

2247

free(direntry);

2248

}

2249

free(direntries);

2250

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

2251

perror_plus("close");

2252

} else {

2253

hookdir_fd = -1;

2254

}

2255

close(devnull);

2256

}

2257

2258

__attribute__((nonnull, warn_unused_result))

2259

int bring_up_interface(const char *const interface,

2260

const float delay){

2261

int old_errno = errno;

2262

int ret;

2263

struct ifreq network;

2264

unsigned int if_index = if_nametoindex(interface);

2265

if(if_index == 0){

2266

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

2267

errno = old_errno;

2268

return ENXIO;

2269

}

2270

2271

if(quit_now){

2272

errno = old_errno;

2273

return EINTR;

2274

}

2275

2276

if(not interface_is_up(interface)){

2277

int ret_errno = 0;

2278

int ioctl_errno = 0;

2279

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

2280

ret_errno = errno;

2281

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

2282

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

2283

errno = old_errno;

2284

return ret_errno;

2285

}

2286

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

2287

2288

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

2289

if(sd == -1){

2290

ret_errno = errno;

2291

perror_plus("socket");

2292

errno = old_errno;

2293

return ret_errno;

2294

}

2295

2296

if(quit_now){

2297

ret = close(sd);

2298

if(ret == -1){

2299

perror_plus("close");

2300

}

2301

errno = old_errno;

2302

return EINTR;

2303

}

2304

2305

if(debug){

2306

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

2307

interface);

2308

}

2309

2310

/* Raise privileges */

2311

ret_errno = raise_privileges();

2312

if(ret_errno != 0){

2313

errno = ret_errno;

2314

perror_plus("Failed to raise privileges");

2315

}

2316

2317

#ifdef __linux__

2318

int ret_linux;

2319

bool restore_loglevel = false;

2320

if(ret_errno == 0){

2321

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2322

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

2323

ret_linux = klogctl(8, NULL, 5);

2324

if(ret_linux == -1){

2325

perror_plus("klogctl");

2326

} else {

2327

restore_loglevel = true;

2328

}

2329

}

2330

#endif /* __linux__ */

2331

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

2332

ioctl_errno = errno;

2333

#ifdef __linux__

2334

if(restore_loglevel){

2335

ret_linux = klogctl(7, NULL, 0);

2336

if(ret_linux == -1){

2337

perror_plus("klogctl");

2338

}

2339

}

2340

#endif /* __linux__ */

2341

2342

/* If raise_privileges() succeeded above */

2343

if(ret_errno == 0){

2344

/* Lower privileges */

2345

ret_errno = lower_privileges();

2346

if(ret_errno != 0){

2347

errno = ret_errno;

2348

perror_plus("Failed to lower privileges");

2349

}

2350

}

2351

2352

/* Close the socket */

2353

ret = close(sd);

2354

if(ret == -1){

2355

perror_plus("close");

2356

}

2357

2358

if(ret_setflags == -1){

2359

errno = ioctl_errno;

2360

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2361

errno = old_errno;

2362

return ioctl_errno;

2363

}

2364

} else if(debug){

2365

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

2366

interface);

2367

}

2368

2369

/* Sleep checking until interface is running.

2370

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

2371

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

2372

if(interface_is_running(interface)){

2373

break;

2374

}

2375

struct timespec sleeptime = { .tv_nsec = 250000000 };

2376

ret = nanosleep(&sleeptime, NULL);

2377

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

2378

perror_plus("nanosleep");

2379

}

2380

}

2381

2382

errno = old_errno;

2383

return 0;

2384

}

2385

2386

__attribute__((nonnull, warn_unused_result))

2387

int take_down_interface(const char *const interface){

2388

int old_errno = errno;

2389

struct ifreq network;

2390

unsigned int if_index = if_nametoindex(interface);

2391

if(if_index == 0){

2392

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

2393

errno = old_errno;

2394

return ENXIO;

2395

}

2396

if(interface_is_up(interface)){

2397

int ret_errno = 0;

2398

int ioctl_errno = 0;

2399

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

2400

ret_errno = errno;

2401

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

2402

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

2403

errno = old_errno;

2404

return ret_errno;

2405

}

2406

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

2407

2408

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

2409

if(sd == -1){

2410

ret_errno = errno;

2411

perror_plus("socket");

2412

errno = old_errno;

2413

return ret_errno;

2414

}

2415

2416

if(debug){

2417

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

2418

interface);

2419

}

2420

2421

/* Raise privileges */

2422

ret_errno = raise_privileges();

2423

if(ret_errno != 0){

2424

errno = ret_errno;

2425

perror_plus("Failed to raise privileges");

2426

}

2427

2428

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

2429

ioctl_errno = errno;

2430

2431

/* If raise_privileges() succeeded above */

2432

if(ret_errno == 0){

2433

/* Lower privileges */

2434

ret_errno = lower_privileges();

2435

if(ret_errno != 0){

2436

errno = ret_errno;

2437

perror_plus("Failed to lower privileges");

2438

}

2439

}

2440

2441

/* Close the socket */

2442

int ret = close(sd);

2443

if(ret == -1){

2444

perror_plus("close");

2445

}

2446

2447

if(ret_setflags == -1){

2448

errno = ioctl_errno;

2449

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2450

errno = old_errno;

2451

return ioctl_errno;

2452

}

2453

} else if(debug){

2454

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

2455

interface);

2456

}

2457

2458

errno = old_errno;

2459

return 0;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

2460

1021

}

2461

1022

2462

1023

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

2463

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

2464

#if GNUTLS_VERSION_NUMBER >= 0x030606

2465

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

2466

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

2467

":%PROFILE_ULTRA",

2468

#elif GNUTLS_VERSION_NUMBER < 0x030600

2469

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

2470

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

2471

#else

2472

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

2473

#endif

2474

.current_server = NULL, .interfaces = NULL,

2475

.interfaces_size = 0 };

2476

1024

AvahiSServiceBrowser *sb = NULL;

2477

error_t ret_errno;

1025

int error;

2478

1026

int ret;

2479

1027

intmax_t tmpmax;

2480

1028

char *tmp;

2481

1029

int exitcode = EXIT_SUCCESS;

2482

char *interfaces_to_take_down = NULL;

2483

size_t interfaces_to_take_down_size = 0;

2484

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

2485

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

2486

char *tempdir = NULL;

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;

2487

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2488

1040

const char *seckey = PATHDIR "/" SECKEY;

2489

1041

const char *pubkey = PATHDIR "/" PUBKEY;

2490

#if GNUTLS_VERSION_NUMBER >= 0x030606

2491

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2492

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2493

#endif

2494

const char *dh_params_file = NULL;

2495

char *interfaces_hooks = NULL;

2496

1042

2497

1043

bool gnutls_initialized = false;

2498

1044

bool gpgme_initialized = false;

2499

1045

float delay = 2.5f;

2500

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

2501

retrying the same server again */

2502

1046

2503

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

2504

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

2510

1054

errno = 0;

2511

1055

ret = setgid(gid);

2512

1056

if(ret == -1){

2513

perror_plus("setgid");

1057

perror("setgid");

2514

1058

}

2515

1059

2516

1060

/* Lower user privileges (temporarily) */

2517

1061

errno = 0;

2518

1062

ret = seteuid(uid);

2519

1063

if(ret == -1){

2520

perror_plus("seteuid");

1064

perror("seteuid");

2521

1065

}

2522

1066

2523

1067

if(quit_now){

2544

1088

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

2545

1089

.arg = "FILE",

2546

1090

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

2547

.group = 1 },

2548

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

2549

.arg = "FILE",

2550

#if GNUTLS_VERSION_NUMBER >= 0x030606

2551

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

2552

#else

2553

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

2554

#endif

2555

.group = 1 },

2556

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

2557

.arg = "FILE",

2558

#if GNUTLS_VERSION_NUMBER >= 0x030606

2559

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

2560

#else

2561

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

2562

#endif

2563

.group = 1 },

1091

.group = 2 },

2564

1092

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

2565

1093

.arg = "BITS",

2566

1094

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

2567

1095

" Diffie-Hellman key exchange",

2568

1096

.group = 2 },

2569

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

2570

.arg = "FILE",

2571

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

2572

" for the Diffie-Hellman key exchange",

2573

.group = 2 },

2574

1097

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

2575

1098

.arg = "STRING",

2576

1099

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

2579

1102

.arg = "SECONDS",

2580

1103

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

2581

1104

.group = 2 },

2582

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

2583

.arg = "SECONDS",

2584

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

2585

.group = 2 },

2586

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

2587

.arg = "DIR",

2588

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

2589

.group = 2 },

2590

1105

/*

2591

1106

* These reproduce what we would get without ARGP_NO_HELP

2592

1107

*/

2610

1125

connect_to = arg;

2611

1126

break;

2612

1127

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

2613

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

2614

arg, (int)',');

2615

if(ret_errno != 0){

2616

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

2617

}

1128

interface = arg;

2618

1129

break;

2619

1130

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

2620

1131

seckey = arg;

2622

1133

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

2623

1134

pubkey = arg;

2624

1135

break;

2625

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

2626

#if GNUTLS_VERSION_NUMBER >= 0x030606

2627

tls_privkey = arg;

2628

#endif

2629

break;

2630

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

2631

#if GNUTLS_VERSION_NUMBER >= 0x030606

2632

tls_pubkey = arg;

2633

#endif

2634

break;

2635

1136

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

2636

1137

errno = 0;

2637

1138

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

2641

1142

}

2642

1143

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

2643

1144

break;

2644

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

2645

dh_params_file = arg;

2646

break;

2647

1145

case 130: /* --priority */

2648

1146

mc.priority = arg;

2649

1147

break;

2653

1151

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

2654

1152

argp_error(state, "Bad delay");

2655

1153

}

2656

case 132: /* --retry */

2657

errno = 0;

2658

retry_interval = strtod(arg, &tmp);

2659

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

2660

or (retry_interval * 1000) > INT_MAX

2661

or retry_interval < 0){

2662

argp_error(state, "Bad retry interval");

2663

}

2664

break;

2665

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

2666

hookdir = arg;

2667

1154

break;

2668

1155

/*

2669

1156

* These reproduce what we would get without ARGP_NO_HELP

2676

1163

argp_state_help(state, state->out_stream,

2677

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2678

1165

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

2679

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

1166

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

2680

1167

exit(argp_err_exit_status);

2681

1168

break;

2682

1169

default:

2689

1176

.args_doc = "",

2690

1177

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

2691

1178

" passwords from a Mandos server" };

2692

ret_errno = argp_parse(&argp, argc, argv,

2693

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2694

switch(ret_errno){

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

2695

1182

case 0:

2696

1183

break;

2697

1184

case ENOMEM:

2698

1185

default:

2699

errno = ret_errno;

2700

perror_plus("argp_parse");

1186

errno = ret;

1187

perror("argp_parse");

2701

1188

exitcode = EX_OSERR;

2702

1189

goto end;

2703

1190

case EINVAL:

2706

1193

}

2707

1194

}

2708

1195

2709

{

2710

/* Work around Debian bug #633582:

2711

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

2712

2713

/* Re-raise privileges */

2714

ret = raise_privileges();

2715

if(ret != 0){

2716

errno = ret;

2717

perror_plus("Failed to raise privileges");

2718

} else {

2719

struct stat st;

2720

2721

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

2722

int seckey_fd = open(seckey, O_RDONLY);

2723

if(seckey_fd == -1){

2724

perror_plus("open");

2725

} else {

2726

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

2727

if(ret == -1){

2728

perror_plus("fstat");

2729

} else {

2730

if(S_ISREG(st.st_mode)

2731

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

2732

ret = fchown(seckey_fd, uid, gid);

2733

if(ret == -1){

2734

perror_plus("fchown");

2735

}

2736

}

2737

}

2738

close(seckey_fd);

2739

}

2740

}

2741

2742

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

2743

int pubkey_fd = open(pubkey, O_RDONLY);

2744

if(pubkey_fd == -1){

2745

perror_plus("open");

2746

} else {

2747

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

2748

if(ret == -1){

2749

perror_plus("fstat");

2750

} else {

2751

if(S_ISREG(st.st_mode)

2752

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

2753

ret = fchown(pubkey_fd, uid, gid);

2754

if(ret == -1){

2755

perror_plus("fchown");

2756

}

2757

}

2758

}

2759

close(pubkey_fd);

2760

}

2761

}

2762

2763

if(dh_params_file != NULL

2764

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

2765

int dhparams_fd = open(dh_params_file, O_RDONLY);

2766

if(dhparams_fd == -1){

2767

perror_plus("open");

2768

} else {

2769

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

2770

if(ret == -1){

2771

perror_plus("fstat");

2772

} else {

2773

if(S_ISREG(st.st_mode)

2774

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

2775

ret = fchown(dhparams_fd, uid, gid);

2776

if(ret == -1){

2777

perror_plus("fchown");

2778

}

2779

}

2780

}

2781

close(dhparams_fd);

2782

}

2783

}

2784

2785

/* Lower privileges */

2786

ret = lower_privileges();

2787

if(ret != 0){

2788

errno = ret;

2789

perror_plus("Failed to lower privileges");

2790

}

2791

}

2792

}

2793

2794

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

2795

{

2796

char *interface = NULL;

2797

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

2798

interface))){

2799

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

2800

and if_nametoindex(interface) == 0){

2801

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

2802

fprintf_plus(stderr, "Not using nonexisting interface"

2803

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

2804

}

2805

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

2806

interface = NULL;

2807

}

2808

}

2809

}

2810

2811

/* Run network hooks */

2812

{

2813

if(mc.interfaces != NULL){

2814

interfaces_hooks = malloc(mc.interfaces_size);

2815

if(interfaces_hooks == NULL){

2816

perror_plus("malloc");

2817

goto end;

2818

}

2819

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

2820

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

2821

}

2822

run_network_hooks("start", interfaces_hooks != NULL ?

2823

interfaces_hooks : "", delay);

2824

}

2825

2826

1196

if(not debug){

2827

1197

avahi_set_log_function(empty_log);

2828

1198

}

2831

1201

from the signal handler */

2832

1202

/* Initialize the pseudo-RNG for Avahi */

2833

1203

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

2834

simple_poll = avahi_simple_poll_new();

2835

if(simple_poll == NULL){

2836

fprintf_plus(stderr,

2837

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

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");

2838

1207

exitcode = EX_UNAVAILABLE;

2839

1208

goto end;

2840

1209

}

2842

1211

sigemptyset(&sigterm_action.sa_mask);

2843

1212

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

2844

1213

if(ret == -1){

2845

perror_plus("sigaddset");

1214

perror("sigaddset");

2846

1215

exitcode = EX_OSERR;

2847

1216

goto end;

2848

1217

}

2849

1218

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

2850

1219

if(ret == -1){

2851

perror_plus("sigaddset");

1220

perror("sigaddset");

2852

1221

exitcode = EX_OSERR;

2853

1222

goto end;

2854

1223

}

2855

1224

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

2856

1225

if(ret == -1){

2857

perror_plus("sigaddset");

1226

perror("sigaddset");

2858

1227

exitcode = EX_OSERR;

2859

1228

goto end;

2860

1229

}

2864

1233

*/

2865

1234

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

2866

1235

if(ret == -1){

2867

perror_plus("sigaction");

1236

perror("sigaction");

2868

1237

return EX_OSERR;

2869

1238

}

2870

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

2871

1240

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

2872

1241

if(ret == -1){

2873

perror_plus("sigaction");

1242

perror("sigaction");

2874

1243

exitcode = EX_OSERR;

2875

1244

goto end;

2876

1245

}

2877

1246

}

2878

1247

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

2879

1248

if(ret == -1){

2880

perror_plus("sigaction");

1249

perror("sigaction");

2881

1250

return EX_OSERR;

2882

1251

}

2883

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

2884

1253

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

2885

1254

if(ret == -1){

2886

perror_plus("sigaction");

1255

perror("sigaction");

2887

1256

exitcode = EX_OSERR;

2888

1257

goto end;

2889

1258

}

2890

1259

}

2891

1260

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

2892

1261

if(ret == -1){

2893

perror_plus("sigaction");

1262

perror("sigaction");

2894

1263

return EX_OSERR;

2895

1264

}

2896

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

2897

1266

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

2898

1267

if(ret == -1){

2899

perror_plus("sigaction");

1268

perror("sigaction");

2900

1269

exitcode = EX_OSERR;

2901

1270

goto end;

2902

1271

}

2903

1272

}

2904

1273

2905

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

2906

if(mc.interfaces == NULL){

2907

struct dirent **direntries = NULL;

2908

/* Look for any good interfaces */

2909

ret = scandir(sys_class_net, &direntries, good_interface,

2910

alphasort);

2911

if(ret >= 1){

2912

/* Add all found interfaces to interfaces list */

2913

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

2914

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

2915

direntries[i]->d_name);

2916

if(ret_errno != 0){

2917

errno = ret_errno;

2918

perror_plus("argz_add");

2919

free(direntries[i]);

2920

continue;

2921

}

2922

if(debug){

2923

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

2924

direntries[i]->d_name);

2925

}

2926

free(direntries[i]);

2927

}

2928

free(direntries);

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");

1359

}

1360

}

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

break;

1378

}

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

}

2929

1409

} else {

2930

if(ret == 0){

2931

free(direntries);

2932

}

2933

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

2934

exitcode = EXIT_FAILURE;

2935

goto end;

2936

}

2937

}

2938

2939

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

2940

{

2941

char *interface = NULL;

2942

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

2943

interface))){

2944

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

2945

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

2946

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

2947

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

2948

interface);

2949

interface = NULL;

2950

while((interface = argz_next(mc.interfaces,

2951

mc.interfaces_size, interface))){

2952

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

2953

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

2954

interface);

2955

interface = NULL;

2956

}

2957

}

2958

break;

2959

}

2960

bool interface_was_up = interface_is_up(interface);

2961

errno = bring_up_interface(interface, delay);

2962

if(not interface_was_up){

2963

if(errno != 0){

2964

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

2965

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

2966

} else {

2967

errno = argz_add(&interfaces_to_take_down,

2968

&interfaces_to_take_down_size,

2969

interface);

2970

if(errno != 0){

2971

perror_plus("argz_add");

2972

}

2973

}

2974

}

2975

}

2976

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

2977

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

2978

}

2979

}

2980

2981

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

2982

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

2983

if(debug){

2984

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

2985

mc.interfaces);

2986

}

2987

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

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2988

1416

}

2989

1417

2990

1418

if(quit_now){

2991

1419

goto end;

2992

1420

}

2993

1421

2994

#if GNUTLS_VERSION_NUMBER >= 0x030606

2995

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

2996

#elif GNUTLS_VERSION_NUMBER < 0x030600

2997

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

2998

#else

2999

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

3000

#endif

1422

ret = init_gnutls_global(pubkey, seckey);

3001

1423

if(ret == -1){

3002

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

1424

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

3003

1425

exitcode = EX_UNAVAILABLE;

3004

1426

goto end;

3005

1427

} else {

3010

1432

goto end;

3011

1433

}

3012

1434

3013

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

3014

tempdir = mkdtemp(run_tempdir);

3015

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

3016

if(debug){

3017

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

3018

run_tempdir, old_tempdir);

3019

}

3020

tempdir = mkdtemp(old_tempdir);

3021

}

3022

if(tempdir == NULL){

3023

perror_plus("mkdtemp");

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

3024

1439

goto end;

3025

1440

}

3026

1441

3028

1443

goto end;

3029

1444

}

3030

1445

3031

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

3032

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

1446

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

1447

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

3033

1448

exitcode = EX_UNAVAILABLE;

3034

1449

goto end;

3035

1450

} else {

3044

1459

/* Connect directly, do not use Zeroconf */

3045

1460

/* (Mainly meant for debugging) */

3046

1461

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

3047

3048

1462

if(address == NULL){

3049

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

1463

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

3050

1464

exitcode = EX_USAGE;

3051

1465

goto end;

3052

1466

}

3055

1469

goto end;

3056

1470

}

3057

1471

3058

in_port_t port;

1472

uint16_t port;

3059

1473

errno = 0;

3060

1474

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

3061

1475

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

3062

or tmpmax != (in_port_t)tmpmax){

3063

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

3064

1478

exitcode = EX_USAGE;

3065

1479

goto end;

3066

1480

}

3067

1481

3068

1482

if(quit_now){

3069

1483

goto end;

3070

1484

}

3071

1485

3072

port = (in_port_t)tmpmax;

1486

port = (uint16_t)tmpmax;

3073

1487

*address = '\0';

1488

address = connect_to;

3074

1489

/* Colon in address indicates IPv6 */

3075

1490

int af;

3076

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

1491

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

3077

1492

af = AF_INET6;

3078

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

3079

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

3080

{

3081

connect_to++;

3082

address[-1] = '\0';

3083

}

3084

1493

} else {

3085

1494

af = AF_INET;

3086

1495

}

3087

address = connect_to;

3088

1496

3089

1497

if(quit_now){

3090

1498

goto end;

3091

1499

}

3092

1500

3093

while(not quit_now){

3094

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

3095

&mc);

3096

if(quit_now or ret == 0){

3097

break;

3098

}

3099

if(debug){

3100

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

3101

(int)retry_interval);

3102

}

3103

sleep((unsigned int)retry_interval);

3104

}

3105

3106

if(not quit_now){

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 {

3107

1523

exitcode = EXIT_SUCCESS;

3108

1524

}

3109

3110

1525

goto end;

3111

1526

}

3112

1527

3124

1539

config.publish_domain = 0;

3125

1540

3126

1541

/* Allocate a new server */

3127

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3128

&config, NULL, NULL, &ret);

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

3129

1545

3130

1546

/* Free the Avahi configuration data */

3131

1547

avahi_server_config_free(&config);

3133

1549

3134

1550

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

3135

1551

if(mc.server == NULL){

3136

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

3137

avahi_strerror(ret));

1552

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

1553

avahi_strerror(error));

3138

1554

exitcode = EX_UNAVAILABLE;

3139

1555

goto end;

3140

1556

}

3146

1562

/* Create the Avahi service browser */

3147

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

3148

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

3149

NULL, 0, browse_callback,

3150

(void *)&mc);

1565

NULL, 0, browse_callback, NULL);

3151

1566

if(sb == NULL){

3152

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

3153

avahi_strerror(avahi_server_errno(mc.server)));

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

3154

1569

exitcode = EX_UNAVAILABLE;

3155

1570

goto end;

3156

1571

}

3162

1577

/* Run the main loop */

3163

1578

3164

1579

if(debug){

3165

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

1580

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

3166

1581

}

3167

1582

3168

ret = avahi_loop_with_timeout(simple_poll,

3169

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

3170

if(debug){

3171

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

3172

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

3173

}

1583

avahi_simple_poll_loop(mc.simple_poll);

3174

1584

3175

1585

end:

3176

1586

3177

1587

if(debug){

3178

if(signal_received){

3179

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

3180

argv[0], signal_received,

3181

strsignal(signal_received));

3182

} else {

3183

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

3184

}

1588

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

3185

1589

}

3186

1590

3187

1591

/* Cleanup things */

3188

free(mc.interfaces);

3189

3190

1592

if(sb != NULL)

3191

1593

avahi_s_service_browser_free(sb);

3192

1594

3193

1595

if(mc.server != NULL)

3194

1596

avahi_server_free(mc.server);

3195

1597

3196

if(simple_poll != NULL)

3197

avahi_simple_poll_free(simple_poll);

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

3198

1600

3199

1601

if(gnutls_initialized){

3200

1602

gnutls_certificate_free_credentials(mc.cred);

1603

gnutls_global_deinit();

3201

1604

gnutls_dh_params_deinit(mc.dh_params);

3202

1605

}

3203

1606

3205

1608

gpgme_release(mc.ctx);

3206

1609

}

3207

1610

3208

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

3209

has seen */

3210

if(mc.current_server != NULL){

3211

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

3212

while(mc.current_server != NULL){

3213

server *next = mc.current_server->next;

3214

#ifdef __GNUC__

3215

#pragma GCC diagnostic push

3216

#pragma GCC diagnostic ignored "-Wcast-qual"

3217

#endif

3218

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

3219

#ifdef __GNUC__

3220

#pragma GCC diagnostic pop

3221

#endif

3222

free(mc.current_server);

3223

mc.current_server = next;

3224

}

3225

}

3226

3227

/* Re-raise privileges */

3228

{

3229

ret = raise_privileges();

3230

if(ret != 0){

3231

errno = ret;

3232

perror_plus("Failed to raise privileges");

3233

} else {

3234

3235

/* Run network hooks */

3236

run_network_hooks("stop", interfaces_hooks != NULL ?

3237

interfaces_hooks : "", delay);

3238

3239

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

3240

{

3241

char *interface = NULL;

3242

while((interface = argz_next(interfaces_to_take_down,

3243

interfaces_to_take_down_size,

3244

interface))){

3245

ret = take_down_interface(interface);

3246

if(ret != 0){

3247

errno = ret;

3248

perror_plus("Failed to take down interface");

3249

}

3250

}

3251

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

3252

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

3253

" down\n");

3254

}

3255

}

3256

}

3257

3258

ret = lower_privileges_permanently();

3259

if(ret != 0){

3260

errno = ret;

3261

perror_plus("Failed to lower privileges permanently");

3262

}

3263

}

3264

3265

free(interfaces_to_take_down);

3266

free(interfaces_hooks);

3267

3268

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

3269

uintmax_t level){

3270

struct dirent **direntries = NULL;

3271

int dret;

3272

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

3273

O_RDONLY

3274

| O_NOFOLLOW

3275

| O_DIRECTORY

3276

| O_PATH));

3277

if(dir_fd == -1){

3278

perror_plus("open");

3279

return;

3280

}

3281

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

3282

notdotentries, alphasort);

3283

if(numentries >= 0){

3284

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

3285

if(debug){

3286

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

3287

dirname, direntries[i]->d_name);

3288

}

3289

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

3290

if(dret == -1){

3291

if(errno == EISDIR){

3292

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

3293

AT_REMOVEDIR);

3294

}

3295

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

3296

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

3297

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

3298

/* Recurse only in this special case */

3299

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

3300

dret = 0;

3301

}

3302

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

3303

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

3304

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

3305

}

3306

}

3307

free(direntries[i]);

3308

}

3309

3310

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

3311

free(direntries);

3312

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3313

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

3314

perror_plus("rmdir");

3315

}

3316

} else {

3317

perror_plus("scandirat");

3318

}

3319

close(dir_fd);

3320

}

3321

3322

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

3323

if(tempdir != NULL){

3324

clean_dir_at(-1, tempdir, 0);

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

}

3325

1685

}

3326

1686

3327

1687

if(quit_now){

3331

1691

&old_sigterm_action,

3332

1692

NULL));

3333

1693

if(ret == -1){

3334

perror_plus("sigaction");

1694

perror("sigaction");

3335

1695

}

3336

1696

do {

3337

1697

ret = raise(signal_received);

3338

1698

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

3339

1699

if(ret != 0){

3340

perror_plus("raise");

1700

perror("raise");

3341

1701

abort();

3342

1702

}

3343

1703

TEMP_FAILURE_RETRY(pause());