/mandos/release : revision 24.1.186

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

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

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program_invocation_short_name */

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

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

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*/

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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, inet_ntop() */

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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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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* 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 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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const char *argp_program_bug_address = "<mandos@fukt.bsnet.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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uint16_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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/* 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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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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.current_server = NULL };

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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 add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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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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return -1;

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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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.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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return -1;

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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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if (mc.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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mc.current_server = new_server;

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

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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->next = mc.current_server;

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new_server->prev = mc.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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mc.current_server->prev = new_server;

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}

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ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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*/

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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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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/*

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

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*/

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bool import_key(const char * const filename){

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bool import_key(const char *filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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{

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gpgme_import_result_t import_result

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= gpgme_op_import_result(mc->ctx);

316

if((import_result->imported < 1

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or import_result->not_imported > 0)

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and import_result->unchanged == 0){

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

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fprintf_plus(stderr,

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

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import_result->considered);

323

fprintf_plus(stderr,

324

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

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import_result->no_user_id);

326

fprintf_plus(stderr,

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

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import_result->imported);

329

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

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import_result->imported_rsa);

331

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

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import_result->unchanged);

333

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

334

import_result->new_user_ids);

335

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

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import_result->new_sub_keys);

337

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

338

import_result->new_signatures);

339

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

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import_result->new_revocations);

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fprintf_plus(stderr,

342

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

343

import_result->secret_read);

344

fprintf_plus(stderr,

345

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

346

import_result->secret_imported);

347

fprintf_plus(stderr,

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

349

import_result->secret_unchanged);

350

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

351

import_result->not_imported);

352

for(gpgme_import_status_t import_status

353

= import_result->imports;

354

import_status != NULL;

355

import_status = import_status->next){

356

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

357

import_status->fpr);

358

if(import_status->result != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(import_status->result),

361

gpgme_strerror(import_status->result));

362

}

363

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

364

fprintf_plus(stderr,

365

import_status->status & GPGME_IMPORT_NEW

366

? "The key was new.\n"

367

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

368

fprintf_plus(stderr,

369

import_status->status & GPGME_IMPORT_UID

370

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

371

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

372

fprintf_plus(stderr,

373

import_status->status & GPGME_IMPORT_SIG

374

? "The key contained new signatures.\n"

375

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

376

fprintf_plus(stderr,

377

import_status->status & GPGME_IMPORT_SUBKEY

378

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

379

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

380

fprintf_plus(stderr,

381

import_status->status & GPGME_IMPORT_SECRET

382

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

383

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

384

}

385

return false;

386

}

387

}

388

264

389

ret = close(fd);

265

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

390

266

if(ret == -1){

391

267

perror_plus("close");

392

268

}

395

271

}

396

272

397

273

if(debug){

398

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

274

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

399

275

}

400

276

401

277

/* Init GPGME */

402

278

gpgme_check_version(NULL);

403

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

404

280

if(rc != GPG_ERR_NO_ERROR){

405

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

406

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

407

283

return false;

408

284

}

409

285

410

286

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

411

287

rc = gpgme_get_engine_info(&engine_info);

412

288

if(rc != GPG_ERR_NO_ERROR){

413

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

414

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

415

291

return false;

416

292

}

417

293

while(engine_info != NULL){

423

299

engine_info = engine_info->next;

424

300

}

425

301

if(engine_info == NULL){

426

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

427

tempdir);

302

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

428

303

return false;

429

304

}

430

305

431

306

/* Create new GPGME "context" */

432

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

307

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

433

308

if(rc != GPG_ERR_NO_ERROR){

434

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

435

gpgme_strsource(rc), gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

436

311

return false;

437

312

}

438

313

447

322

* Decrypt OpenPGP data.

448

323

* Returns -1 on error

449

324

*/

450

__attribute__((nonnull, warn_unused_result))

451

325

static ssize_t pgp_packet_decrypt(const char *cryptotext,

452

326

size_t crypto_size,

453

char **plaintext,

454

mandos_context *mc){

327

char **plaintext){

455

328

gpgme_data_t dh_crypto, dh_plain;

456

329

gpgme_error_t rc;

457

330

ssize_t ret;

459

332

ssize_t plaintext_length = 0;

460

333

461

334

if(debug){

462

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

335

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

463

336

}

464

337

465

338

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

466

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

467

340

0);

468

341

if(rc != GPG_ERR_NO_ERROR){

469

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

470

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

471

344

return -1;

472

345

}

473

346

474

347

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

475

348

rc = gpgme_data_new(&dh_plain);

476

349

if(rc != GPG_ERR_NO_ERROR){

477

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

478

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

479

352

gpgme_data_release(dh_crypto);

480

353

return -1;

481

354

}

482

355

483

356

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

484

357

data buffer */

485

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

358

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

486

359

if(rc != GPG_ERR_NO_ERROR){

487

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

488

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

489

362

plaintext_length = -1;

490

363

if(debug){

491

364

gpgme_decrypt_result_t result;

492

result = gpgme_op_decrypt_result(mc->ctx);

365

result = gpgme_op_decrypt_result(mc.ctx);

493

366

if(result == NULL){

494

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

367

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

495

368

} else {

496

if(result->unsupported_algorithm != NULL) {

497

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

498

result->unsupported_algorithm);

499

}

500

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

501

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

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

502

373

if(result->file_name != NULL){

503

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

374

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

504

375

}

505

506

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

507

r = r->next){

508

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

509

gpgme_pubkey_algo_name(r->pubkey_algo));

510

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

511

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

512

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

376

gpgme_recipient_t recipient;

377

recipient = result->recipients;

378

while(recipient != NULL){

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

385

recipient = recipient->next;

513

386

}

514

387

}

515

388

}

517

390

}

518

391

519

392

if(debug){

520

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

393

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

521

394

}

522

395

523

396

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

530

403

*plaintext = NULL;

531

404

while(true){

532

405

plaintext_capacity = incbuffer(plaintext,

533

(size_t)plaintext_length,

534

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

535

408

if(plaintext_capacity == 0){

536

perror_plus("incbuffer");

537

plaintext_length = -1;

538

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

539

412

}

540

413

541

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

554

427

}

555

428

556

429

if(debug){

557

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

430

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

558

431

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

559

432

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

560

433

}

571

444

return plaintext_length;

572

445

}

573

446

574

__attribute__((warn_unused_result, const))

575

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

576

if(str == NULL)

577

return "(unknown)";

578

return str;

579

}

580

581

__attribute__((warn_unused_result))

582

static const char *safer_gnutls_strerror(int value){

583

const char *ret = gnutls_strerror(value);

584

return safe_string(ret);

447

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

450

if(ret == NULL)

451

ret = "(unknown)";

452

return ret;

585

453

}

586

454

587

455

/* GnuTLS log function callback */

588

__attribute__((nonnull))

589

456

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

590

457

const char* string){

591

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

458

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

592

459

}

593

460

594

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

595

461

static int init_gnutls_global(const char *pubkeyfilename,

596

const char *seckeyfilename,

597

const char *dhparamsfilename,

598

mandos_context *mc){

462

const char *seckeyfilename){

599

463

int ret;

600

unsigned int uret;

601

464

602

465

if(debug){

603

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

466

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

467

}

468

469

ret = gnutls_global_init();

470

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

473

return -1;

604

474

}

605

475

606

476

if(debug){

612

482

}

613

483

614

484

/* OpenPGP credentials */

615

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

616

486

if(ret != GNUTLS_E_SUCCESS){

617

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

618

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

489

gnutls_global_deinit();

619

490

return -1;

620

491

}

621

492

622

493

if(debug){

623

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

624

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

625

pubkeyfilename,

626

seckeyfilename);

494

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

495

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

496

seckeyfilename);

627

497

}

628

498

629

499

ret = gnutls_certificate_set_openpgp_key_file

630

(mc->cred, pubkeyfilename, seckeyfilename,

500

(mc.cred, pubkeyfilename, seckeyfilename,

631

501

GNUTLS_OPENPGP_FMT_BASE64);

632

502

if(ret != GNUTLS_E_SUCCESS){

633

fprintf_plus(stderr,

634

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

635

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

636

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

637

safer_gnutls_strerror(ret));

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

638

508

goto globalfail;

639

509

}

640

510

641

511

/* GnuTLS server initialization */

642

ret = gnutls_dh_params_init(&mc->dh_params);

643

if(ret != GNUTLS_E_SUCCESS){

644

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

645

" initialization: %s\n",

646

safer_gnutls_strerror(ret));

647

goto globalfail;

648

}

649

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

650

if(dhparamsfilename != NULL){

651

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

652

do {

653

int dhpfile = open(dhparamsfilename, O_RDONLY);

654

if(dhpfile == -1){

655

perror_plus("open");

656

dhparamsfilename = NULL;

657

break;

658

}

659

size_t params_capacity = 0;

660

while(true){

661

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

662

(size_t)params.size,

663

(size_t)params_capacity);

664

if(params_capacity == 0){

665

perror_plus("incbuffer");

666

free(params.data);

667

params.data = NULL;

668

dhparamsfilename = NULL;

669

break;

670

}

671

ssize_t bytes_read = read(dhpfile,

672

params.data + params.size,

673

BUFFER_SIZE);

674

/* EOF */

675

if(bytes_read == 0){

676

break;

677

}

678

/* check bytes_read for failure */

679

if(bytes_read < 0){

680

perror_plus("read");

681

free(params.data);

682

params.data = NULL;

683

dhparamsfilename = NULL;

684

break;

685

}

686

params.size += (unsigned int)bytes_read;

687

}

688

ret = close(dhpfile);

689

if(ret == -1){

690

perror_plus("close");

691

}

692

if(params.data == NULL){

693

dhparamsfilename = NULL;

694

}

695

if(dhparamsfilename == NULL){

696

break;

697

}

698

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

699

GNUTLS_X509_FMT_PEM);

700

if(ret != GNUTLS_E_SUCCESS){

701

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

702

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

703

safer_gnutls_strerror(ret));

704

dhparamsfilename = NULL;

705

}

706

free(params.data);

707

} while(false);

708

}

709

if(dhparamsfilename == NULL){

710

if(mc->dh_bits == 0){

711

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

712

/* Try to read the private key file */

713

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

714

do {

715

int secfile = open(seckeyfilename, O_RDONLY);

716

if(secfile == -1){

717

perror_plus("open");

718

break;

719

}

720

size_t buffer_capacity = 0;

721

while(true){

722

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

723

(size_t)buffer.size,

724

(size_t)buffer_capacity);

725

if(buffer_capacity == 0){

726

perror_plus("incbuffer");

727

free(buffer.data);

728

buffer.data = NULL;

729

break;

730

}

731

ssize_t bytes_read = read(secfile,

732

buffer.data + buffer.size,

733

BUFFER_SIZE);

734

/* EOF */

735

if(bytes_read == 0){

736

break;

737

}

738

/* check bytes_read for failure */

739

if(bytes_read < 0){

740

perror_plus("read");

741

free(buffer.data);

742

buffer.data = NULL;

743

break;

744

}

745

buffer.size += (unsigned int)bytes_read;

746

}

747

close(secfile);

748

} while(false);

749

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

750

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

751

if(buffer.data != NULL){

752

{

753

gnutls_openpgp_privkey_t privkey = NULL;

754

ret = gnutls_openpgp_privkey_init(&privkey);

755

if(ret != GNUTLS_E_SUCCESS){

756

fprintf_plus(stderr, "Error initializing OpenPGP key"

757

" structure: %s",

758

safer_gnutls_strerror(ret));

759

free(buffer.data);

760

buffer.data = NULL;

761

} else {

762

ret = gnutls_openpgp_privkey_import

763

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

764

if(ret != GNUTLS_E_SUCCESS){

765

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

766

safer_gnutls_strerror(ret));

767

privkey = NULL;

768

}

769

free(buffer.data);

770

buffer.data = NULL;

771

if(privkey != NULL){

772

/* Use private key to suggest an appropriate

773

sec_param */

774

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

775

gnutls_openpgp_privkey_deinit(privkey);

776

if(debug){

777

fprintf_plus(stderr, "This OpenPGP key implies using"

778

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

779

safe_string(gnutls_sec_param_get_name

780

(sec_param)));

781

}

782

}

783

}

784

}

785

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

786

/* Err on the side of caution */

787

sec_param = GNUTLS_SEC_PARAM_ULTRA;

788

if(debug){

789

fprintf_plus(stderr, "Falling back to security parameter"

790

" \"%s\"\n",

791

safe_string(gnutls_sec_param_get_name

792

(sec_param)));

793

}

794

}

795

}

796

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

797

if(uret != 0){

798

mc->dh_bits = uret;

799

if(debug){

800

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

801

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

802

safe_string(gnutls_sec_param_get_name

803

(sec_param)),

804

mc->dh_bits);

805

}

806

} else {

807

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

808

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

809

safe_string(gnutls_sec_param_get_name

810

(sec_param)),

811

safer_gnutls_strerror(ret));

812

goto globalfail;

813

}

814

} else if(debug){

815

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

816

mc->dh_bits);

817

}

818

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

819

if(ret != GNUTLS_E_SUCCESS){

820

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

821

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

822

safer_gnutls_strerror(ret));

823

goto globalfail;

824

}

825

}

826

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

512

ret = gnutls_dh_params_init(&mc.dh_params);

513

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

516

goto globalfail;

517

}

518

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

519

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

522

goto globalfail;

523

}

524

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

827

526

828

527

return 0;

829

528

830

529

globalfail:

831

530

832

gnutls_certificate_free_credentials(mc->cred);

833

gnutls_dh_params_deinit(mc->dh_params);

531

gnutls_certificate_free_credentials(mc.cred);

532

gnutls_global_deinit();

533

gnutls_dh_params_deinit(mc.dh_params);

834

534

return -1;

835

535

}

836

536

837

__attribute__((nonnull, warn_unused_result))

838

static int init_gnutls_session(gnutls_session_t *session,

839

mandos_context *mc){

537

static int init_gnutls_session(gnutls_session_t *session){

840

538

int ret;

841

539

/* GnuTLS session creation */

842

540

do {

846

544

}

847

545

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

848

546

if(ret != GNUTLS_E_SUCCESS){

849

fprintf_plus(stderr,

850

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

851

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

852

549

}

853

550

854

551

{

855

552

const char *err;

856

553

do {

857

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

554

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

858

555

if(quit_now){

859

556

gnutls_deinit(*session);

860

557

return -1;

861

558

}

862

559

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

863

560

if(ret != GNUTLS_E_SUCCESS){

864

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

865

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

866

safer_gnutls_strerror(ret));

561

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

562

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

563

safer_gnutls_strerror(ret));

867

564

gnutls_deinit(*session);

868

565

return -1;

869

566

}

871

568

872

569

do {

873

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

874

mc->cred);

571

mc.cred);

875

572

if(quit_now){

876

573

gnutls_deinit(*session);

877

574

return -1;

878

575

}

879

576

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

880

577

if(ret != GNUTLS_E_SUCCESS){

881

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

882

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

883

580

gnutls_deinit(*session);

884

581

return -1;

885

582

}

887

584

/* ignore client certificate if any. */

888

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

889

586

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

588

890

589

return 0;

891

590

}

892

591

894

593

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

895

594

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

896

595

897

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

898

__attribute__((warn_unused_result))

899

int raise_privileges(void){

900

int old_errno = errno;

901

int ret = 0;

902

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

903

ret = errno;

904

}

905

errno = old_errno;

906

return ret;

907

}

908

909

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

910

__attribute__((warn_unused_result))

911

int raise_privileges_permanently(void){

912

int old_errno = errno;

913

int ret = raise_privileges();

914

if(ret != 0){

915

errno = old_errno;

916

return ret;

917

}

918

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

919

ret = errno;

920

}

921

errno = old_errno;

922

return ret;

923

}

924

925

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

926

__attribute__((warn_unused_result))

927

int lower_privileges(void){

928

int old_errno = errno;

929

int ret = 0;

930

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

931

ret = errno;

932

}

933

errno = old_errno;

934

return ret;

935

}

936

937

/* Lower privileges permanently */

938

__attribute__((warn_unused_result))

939

int lower_privileges_permanently(void){

940

int old_errno = errno;

941

int ret = 0;

942

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

943

ret = errno;

944

}

945

errno = old_errno;

946

return ret;

947

}

948

949

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

950

__attribute__((nonnull, warn_unused_result))

951

static bool add_delete_local_route(const bool add,

952

const char *address,

953

AvahiIfIndex if_index){

954

int ret;

955

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

956

char add_arg[] = "add";

957

char delete_arg[] = "delete";

958

char debug_flag[] = "--debug";

959

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

960

if(pluginhelperdir == NULL){

961

if(debug){

962

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

963

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

964

}

965

return false;

966

}

967

968

char interface[IF_NAMESIZE];

969

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

970

perror_plus("if_indextoname");

971

return false;

972

}

973

974

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

975

if(devnull == -1){

976

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

977

return false;

978

}

979

pid_t pid = fork();

980

if(pid == 0){

981

/* Child */

982

/* Raise privileges */

983

errno = raise_privileges_permanently();

984

if(errno != 0){

985

perror_plus("Failed to raise privileges");

986

/* _exit(EX_NOPERM); */

987

} else {

988

/* Set group */

989

errno = 0;

990

ret = setgid(0);

991

if(ret == -1){

992

perror_plus("setgid");

993

_exit(EX_NOPERM);

994

}

995

/* Reset supplementary groups */

996

errno = 0;

997

ret = setgroups(0, NULL);

998

if(ret == -1){

999

perror_plus("setgroups");

1000

_exit(EX_NOPERM);

1001

}

1002

}

1003

ret = dup2(devnull, STDIN_FILENO);

1004

if(ret == -1){

1005

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

1006

_exit(EX_OSERR);

1007

}

1008

ret = close(devnull);

1009

if(ret == -1){

1010

perror_plus("close");

1011

_exit(EX_OSERR);

1012

}

1013

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1014

if(ret == -1){

1015

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

1016

_exit(EX_OSERR);

1017

}

1018

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

1019

O_RDONLY

1020

| O_DIRECTORY

1021

| O_PATH

1022

| O_CLOEXEC));

1023

if(helperdir_fd == -1){

1024

perror_plus("open");

1025

_exit(EX_UNAVAILABLE);

1026

}

1027

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

1028

helper, O_RDONLY));

1029

if(helper_fd == -1){

1030

perror_plus("openat");

1031

close(helperdir_fd);

1032

_exit(EX_UNAVAILABLE);

1033

}

1034

close(helperdir_fd);

1035

#ifdef __GNUC__

1036

#pragma GCC diagnostic push

1037

#pragma GCC diagnostic ignored "-Wcast-qual"

1038

#endif

1039

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

1040

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

1041

interface, debug ? debug_flag : NULL, NULL },

1042

environ) == -1){

1043

#ifdef __GNUC__

1044

#pragma GCC diagnostic pop

1045

#endif

1046

perror_plus("fexecve");

1047

_exit(EXIT_FAILURE);

1048

}

1049

}

1050

if(pid == -1){

1051

perror_plus("fork");

1052

return false;

1053

}

1054

int status;

1055

pid_t pret = -1;

1056

errno = 0;

1057

do {

1058

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

1059

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

1060

int errno_raising = 0;

1061

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

1062

errno_raising = errno;

1063

perror_plus("Failed to raise privileges in order to"

1064

" kill helper program");

1065

}

1066

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

1067

perror_plus("kill");

1068

}

1069

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

1070

perror_plus("Failed to lower privileges after killing"

1071

" helper program");

1072

}

1073

return false;

1074

}

1075

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

1076

if(pret == -1){

1077

perror_plus("waitpid");

1078

return false;

1079

}

1080

if(WIFEXITED(status)){

1081

if(WEXITSTATUS(status) != 0){

1082

fprintf_plus(stderr, "Error: iprouteadddel exited"

1083

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

1084

return false;

1085

}

1086

return true;

1087

}

1088

if(WIFSIGNALED(status)){

1089

fprintf_plus(stderr, "Error: iprouteadddel died by"

1090

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

1091

return false;

1092

}

1093

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

1094

return false;

1095

}

1096

1097

__attribute__((nonnull, warn_unused_result))

1098

static bool add_local_route(const char *address,

1099

AvahiIfIndex if_index){

1100

if(debug){

1101

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

1102

}

1103

return add_delete_local_route(true, address, if_index);

1104

}

1105

1106

__attribute__((nonnull, warn_unused_result))

1107

static bool delete_local_route(const char *address,

1108

AvahiIfIndex if_index){

1109

if(debug){

1110

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

1111

}

1112

return add_delete_local_route(false, address, if_index);

1113

}

1114

1115

596

/* Called when a Mandos server is found */

1116

__attribute__((nonnull, warn_unused_result))

1117

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

597

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

1118

598

AvahiIfIndex if_index,

1119

int af, mandos_context *mc){

599

int af){

1120

600

int ret, tcp_sd = -1;

1121

601

ssize_t sret;

1122

struct sockaddr_storage to;

602

union {

603

struct sockaddr_in in;

604

struct sockaddr_in6 in6;

605

} to;

1123

606

char *buffer = NULL;

1124

607

char *decrypted_buffer = NULL;

1125

608

size_t buffer_length = 0;

1128

611

int retval = -1;

1129

612

gnutls_session_t session;

1130

613

int pf; /* Protocol family */

1131

bool route_added = false;

1132

614

1133

615

errno = 0;

1134

616

1145

627

pf = PF_INET;

1146

628

break;

1147

629

default:

1148

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

630

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

1149

631

errno = EINVAL;

1150

632

return -1;

1151

633

}

1152

634

1153

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

1154

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

1155

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

1156

bool match = false;

1157

{

1158

char *interface = NULL;

1159

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

1160

mc->interfaces_size,

1161

interface))){

1162

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

1163

match = true;

1164

break;

1165

}

1166

}

1167

}

1168

if(not match){

1169

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

1170

connect to the server */

1171

if(debug){

1172

char interface[IF_NAMESIZE];

1173

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

1174

perror_plus("if_indextoname");

1175

} else {

1176

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

1177

" \"%s\"\n",

1178

if_indextoname((unsigned int)if_index,

1179

interface));

1180

}

1181

}

1182

return -1;

1183

}

1184

}

1185

1186

ret = init_gnutls_session(&session, mc);

635

ret = init_gnutls_session(&session);

1187

636

if(ret != 0){

1188

637

return -1;

1189

638

}

1190

639

1191

640

if(debug){

1192

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

1193

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

641

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

642

"\n", ip, port);

1194

643

}

1195

644

1196

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

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

1197

646

if(tcp_sd < 0){

1198

647

int e = errno;

1199

648

perror_plus("socket");

1206

655

goto mandos_end;

1207

656

}

1208

657

658

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

1209

659

if(af == AF_INET6){

1210

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

1211

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

1212

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

660

to.in6.sin6_family = (sa_family_t)af;

661

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

1213

662

} else { /* IPv4 */

1214

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

1215

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

1216

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

663

to.in.sin_family = (sa_family_t)af;

664

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

1217

665

}

1218

666

if(ret < 0 ){

1219

667

int e = errno;

1223

671

}

1224

672

if(ret == 0){

1225

673

int e = errno;

1226

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

674

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

1227

675

errno = e;

1228

676

goto mandos_end;

1229

677

}

1230

678

if(af == AF_INET6){

1231

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

1232

if(IN6_IS_ADDR_LINKLOCAL

1233

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

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

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

685

-Wunreachable-code*/

1234

686

if(if_index == AVAHI_IF_UNSPEC){

1235

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

1236

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

1237

689

errno = EINVAL;

1238

690

goto mandos_end;

1239

691

}

1240

692

/* Set the network interface number as scope */

1241

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

693

to.in6.sin6_scope_id = (uint32_t)if_index;

1242

694

}

1243

695

} else {

1244

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

696

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

697

-Wconversion and

698

-Wunreachable-code */

1245

699

}

1246

700

1247

701

if(quit_now){

1255

709

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

1256

710

perror_plus("if_indextoname");

1257

711

} else {

1258

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

1259

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

712

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

713

ip, interface, port);

1260

714

}

1261

715

} else {

1262

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

1263

ip, (uintmax_t)port);

716

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

717

port);

1264

718

}

1265

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1266

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1267

if(af == AF_INET6){

1268

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

1269

sizeof(struct sockaddr_in6),

1270

addrstr, sizeof(addrstr), NULL, 0,

1271

NI_NUMERICHOST);

1272

} else {

1273

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

1274

sizeof(struct sockaddr_in),

1275

addrstr, sizeof(addrstr), NULL, 0,

1276

NI_NUMERICHOST);

1277

}

1278

if(ret == EAI_SYSTEM){

1279

perror_plus("getnameinfo");

1280

} else if(ret != 0) {

1281

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

1282

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

1283

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

1284

}

1285

}

1286

1287

if(quit_now){

1288

errno = EINTR;

1289

goto mandos_end;

1290

}

1291

1292

while(true){

1293

if(af == AF_INET6){

1294

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

1295

sizeof(struct sockaddr_in6));

1296

} else {

1297

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

1298

sizeof(struct sockaddr_in));

1299

}

1300

if(ret < 0){

1301

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

1302

and if_index != AVAHI_IF_UNSPEC

1303

and connect_to == NULL

1304

and not route_added and

1305

((af == AF_INET6 and not

1306

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1307

&to)->sin6_addr)))

1308

or (af == AF_INET and

1309

/* Not a a IPv4LL address */

1310

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

1311

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

1312

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

1313

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

1314

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

1315

connect to a Mandos server announced by Avahi on a server

1316

host with a global address. Work around this by retrying

1317

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

1318

1319

Avahi bug reference:

1320

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

1321

https://bugs.debian.org/587961

1322

*/

1323

if(debug){

1324

fprintf_plus(stderr, "Mandos server unreachable, trying"

1325

" direct route\n");

1326

}

1327

int e = errno;

1328

route_added = add_local_route(ip, if_index);

1329

if(route_added){

1330

continue;

1331

}

1332

errno = e;

1333

}

1334

if(errno != ECONNREFUSED or debug){

1335

int e = errno;

1336

perror_plus("connect");

1337

errno = e;

1338

}

1339

goto mandos_end;

1340

}

1341

1342

if(quit_now){

1343

errno = EINTR;

1344

goto mandos_end;

1345

}

1346

break;

721

const char *pcret;

722

if(af == AF_INET6){

723

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

724

sizeof(addrstr));

725

} else {

726

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

727

sizeof(addrstr));

728

}

729

if(pcret == NULL){

730

perror_plus("inet_ntop");

731

} else {

732

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

733

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

734

}

735

}

736

}

737

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

743

if(af == AF_INET6){

744

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

745

} else {

746

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

747

}

748

if(ret < 0){

749

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

754

goto mandos_end;

755

}

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

1347

760

}

1348

761

1349

762

const char *out = mandos_protocol_version;

1351

764

while(true){

1352

765

size_t out_size = strlen(out);

1353

766

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

1354

out_size - written));

767

out_size - written));

1355

768

if(ret == -1){

1356

769

int e = errno;

1357

770

perror_plus("write");

1377

790

}

1378

791

1379

792

if(debug){

1380

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

793

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

1381

794

}

1382

795

1383

796

if(quit_now){

1385

798

goto mandos_end;

1386

799

}

1387

800

1388

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

1389

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

1390

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

1391

gnutls_transport_set_ptr(session,

1392

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

801

/* Spurious warning from -Wint-to-pointer-cast */

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1393

803

1394

804

if(quit_now){

1395

805

errno = EINTR;

1406

816

1407

817

if(ret != GNUTLS_E_SUCCESS){

1408

818

if(debug){

1409

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

819

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

1410

820

gnutls_perror(ret);

1411

821

}

1412

822

errno = EPROTO;

1416

826

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

1417

827

1418

828

if(debug){

1419

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1420

" %s\n", ip);

829

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

830

ip);

1421

831

}

1422

832

1423

833

while(true){

1428

838

}

1429

839

1430

840

buffer_capacity = incbuffer(&buffer, buffer_length,

1431

buffer_capacity);

841

buffer_capacity);

1432

842

if(buffer_capacity == 0){

1433

843

int e = errno;

1434

844

perror_plus("incbuffer");

1461

871

}

1462

872

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

1463

873

if(ret < 0){

1464

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

1465

"***\n");

874

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

1466

875

gnutls_perror(ret);

1467

876

errno = EPROTO;

1468

877

goto mandos_end;

1469

878

}

1470

879

break;

1471

880

default:

1472

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

1473

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

1474

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1475

884

errno = EIO;

1476

885

goto mandos_end;

1481

890

}

1482

891

1483

892

if(debug){

1484

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

893

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

1485

894

}

1486

895

1487

896

if(quit_now){

1499

908

1500

909

if(buffer_length > 0){

1501

910

ssize_t decrypted_buffer_size;

1502

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1503

&decrypted_buffer, mc);

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

1504

914

if(decrypted_buffer_size >= 0){

1505

915

1506

clearerr(stdout);

1507

916

written = 0;

1508

917

while(written < (size_t) decrypted_buffer_size){

1509

918

if(quit_now){

1517

926

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

1518

927

int e = errno;

1519

928

if(debug){

1520

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

1521

strerror(errno));

929

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

930

strerror(errno));

1522

931

}

1523

932

errno = e;

1524

933

goto mandos_end;

1525

934

}

1526

935

written += (size_t)ret;

1527

936

}

1528

ret = fflush(stdout);

1529

if(ret != 0){

1530

int e = errno;

1531

if(debug){

1532

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

1533

strerror(errno));

1534

}

1535

errno = e;

1536

goto mandos_end;

1537

}

1538

937

retval = 0;

1539

938

}

1540

939

}

1543

942

1544

943

mandos_end:

1545

944

{

1546

if(route_added){

1547

if(not delete_local_route(ip, if_index)){

1548

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

1549

" interface %d", ip, if_index);

1550

}

1551

}

1552

945

int e = errno;

1553

946

free(decrypted_buffer);

1554

947

free(buffer);

1555

948

if(tcp_sd >= 0){

1556

ret = close(tcp_sd);

949

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

1557

950

}

1558

951

if(ret == -1){

1559

952

if(e == 0){

1584

977

AVAHI_GCC_UNUSED AvahiStringList *txt,

1585

978

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1586

979

flags,

1587

void *mc){

1588

if(r == NULL){

1589

return;

1590

}

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1591

982

1592

983

/* Called whenever a service has been resolved successfully or

1593

984

timed out */

1594

985

1595

986

if(quit_now){

1596

avahi_s_service_resolver_free(r);

1597

987

return;

1598

988

}

1599

989

1600

990

switch(event){

1601

991

default:

1602

992

case AVAHI_RESOLVER_FAILURE:

1603

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

1604

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

1605

domain,

1606

avahi_strerror(avahi_server_errno

1607

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

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1608

996

break;

1609

997

1610

998

case AVAHI_RESOLVER_FOUND:

1612

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1613

1001

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

1614

1002

if(debug){

1615

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

1616

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

1617

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

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1618

1006

}

1619

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

1620

interface,

1621

avahi_proto_to_af(proto),

1622

mc);

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1623

1009

if(ret == 0){

1624

avahi_simple_poll_quit(simple_poll);

1010

avahi_simple_poll_quit(mc.simple_poll);

1625

1011

} else {

1626

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

1627

avahi_proto_to_af(proto),

1628

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

1629

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

1630

" list\n", name);

1631

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1632

1014

}

1633

1015

}

1634

1016

}

1644

1026

const char *domain,

1645

1027

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1646

1028

flags,

1647

void *mc){

1648

if(b == NULL){

1649

return;

1650

}

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1651

1031

1652

1032

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

1653

1033

is removed from the LAN */

1660

1040

default:

1661

1041

case AVAHI_BROWSER_FAILURE:

1662

1042

1663

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

1664

avahi_strerror(avahi_server_errno

1665

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

1666

avahi_simple_poll_quit(simple_poll);

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

avahi_simple_poll_quit(mc.simple_poll);

1667

1046

return;

1668

1047

1669

1048

case AVAHI_BROWSER_NEW:

1672

1051

the callback function is called the Avahi server will free the

1673

1052

resolver for us. */

1674

1053

1675

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

1676

interface, protocol, name, type,

1677

domain, protocol, 0,

1678

resolve_callback, mc) == NULL)

1679

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

1680

" %s\n", name,

1681

avahi_strerror(avahi_server_errno

1682

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

1054

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

1055

name, type, domain, protocol, 0,

1056

resolve_callback, NULL) == NULL)

1057

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

1058

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

1683

1059

break;

1684

1060

1685

1061

case AVAHI_BROWSER_REMOVE:

1688

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1689

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1690

1066

if(debug){

1691

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

1692

" searching...\n");

1067

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

1693

1068

}

1694

1069

break;

1695

1070

}

1704

1079

signal_received = sig;

1705

1080

int old_errno = errno;

1706

1081

/* set main loop to exit */

1707

if(simple_poll != NULL){

1708

avahi_simple_poll_quit(simple_poll);

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1709

1084

}

1710

1085

errno = old_errno;

1711

1086

}

1712

1087

1713

__attribute__((nonnull, warn_unused_result))

1714

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

1715

int ret;

1716

int old_errno;

1717

1718

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

1719

if(s < 0){

1720

old_errno = errno;

1721

perror_plus("socket");

1722

errno = old_errno;

1723

return false;

1724

}

1725

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

1726

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

1727

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1728

if(ret == -1){

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1113

/* read line from flags_fd */

1114

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1115

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1116

flagstring[(size_t)to_read] = '\0';

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

tmpmax = strtoimax(flagstring, &tmp, 0);

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1729

1144

if(debug){

1730

old_errno = errno;

1731

perror_plus("ioctl SIOCGIFFLAGS");

1732

errno = old_errno;

1733

}

1734

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

1735

old_errno = errno;

1736

perror_plus("close");

1737

errno = old_errno;

1738

}

1739

return false;

1740

}

1741

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

1742

old_errno = errno;

1743

perror_plus("close");

1744

errno = old_errno;

1745

}

1746

return true;

1747

}

1748

1749

__attribute__((nonnull, warn_unused_result))

1750

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

1751

1145

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1146

flagstring, if_entry->d_name);

1147

}

1148

free(flagstring);

1149

return 0;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1752

1153

/* Reject the loopback device */

1753

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1754

1155

if(debug){

1755

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

1756

ifname);

1156

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

1157

if_entry->d_name);

1757

1158

}

1758

return false;

1159

return 0;

1759

1160

}

1760

1161

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

1761

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

1162

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1762

1163

if(debug){

1763

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

1764

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

1164

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1165

if_entry->d_name);

1765

1166

}

1766

return true;

1167

return 1;

1767

1168

}

1768

1169

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

1769

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

1170

if(not (flags & IFF_BROADCAST)){

1770

1171

if(debug){

1771

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1772

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

1172

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1173

if_entry->d_name);

1773

1174

}

1774

return false;

1175

return 0;

1775

1176

}

1776

1177

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

1777

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1778

1179

if(debug){

1779

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

1780

ifname);

1180

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

1181

if_entry->d_name);

1781

1182

}

1782

return false;

1183

return 0;

1783

1184

}

1784

1785

1185

/* Accept this device */

1786

1186

if(debug){

1787

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

1788

}

1789

return true;

1790

}

1791

1792

/*

1793

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

1794

* corresponds to an acceptable network device.

1795

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

1796

*/

1797

__attribute__((nonnull, warn_unused_result))

1798

int good_interface(const struct dirent *if_entry){

1799

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

1800

return 0;

1801

}

1802

1803

struct ifreq ifr;

1804

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

1805

if(debug){

1806

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

1807

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

1808

}

1809

return 0;

1810

}

1811

1812

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

1813

return 0;

1187

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1188

if_entry->d_name);

1814

1189

}

1815

1190

return 1;

1816

1191

}

1817

1192

1818

/*

1819

* This function determines if a network interface is up.

1820

*/

1821

__attribute__((nonnull, warn_unused_result))

1822

bool interface_is_up(const char *interface){

1823

struct ifreq ifr;

1824

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

1825

if(debug){

1826

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

1827

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

1828

}

1829

return false;

1830

}

1831

1832

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

1833

}

1834

1835

/*

1836

* This function determines if a network interface is running

1837

*/

1838

__attribute__((nonnull, warn_unused_result))

1839

bool interface_is_running(const char *interface){

1840

struct ifreq ifr;

1841

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

1842

if(debug){

1843

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

1844

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

1845

}

1846

return false;

1847

}

1848

1849

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

1850

}

1851

1852

__attribute__((nonnull, pure, warn_unused_result))

1853

1193

int notdotentries(const struct dirent *direntry){

1854

1194

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

1855

1195

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

1861

1201

return 1;

1862

1202

}

1863

1203

1864

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

1865

__attribute__((nonnull, warn_unused_result))

1866

int runnable_hook(const struct dirent *direntry){

1867

int ret;

1868

size_t sret;

1869

struct stat st;

1870

1871

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

1872

/* Empty name? */

1873

return 0;

1874

}

1875

1876

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

1877

"abcdefghijklmnopqrstuvwxyz"

1878

"0123456789"

1879

"_.-");

1880

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

1881

/* Contains non-allowed characters */

1882

if(debug){

1883

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

1884

direntry->d_name);

1885

}

1886

return 0;

1887

}

1888

1889

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

1890

if(ret == -1){

1891

if(debug){

1892

perror_plus("Could not stat hook");

1893

}

1894

return 0;

1895

}

1896

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

1897

/* Not a regular file */

1898

if(debug){

1899

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

1900

direntry->d_name);

1901

}

1902

return 0;

1903

}

1904

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

1905

/* Not executable */

1906

if(debug){

1907

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

1908

direntry->d_name);

1909

}

1910

return 0;

1911

}

1912

if(debug){

1913

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

1914

direntry->d_name);

1915

}

1916

return 1;

1917

}

1918

1919

__attribute__((nonnull, warn_unused_result))

1920

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1921

mandos_context *mc){

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1922

1205

int ret;

1923

1206

struct timespec now;

1924

1207

struct timespec waited_time;

1925

1208

intmax_t block_time;

1926

1209

1927

1210

while(true){

1928

if(mc->current_server == NULL){

1929

if(debug){

1930

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

1931

" No timeout!\n");

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

"Wait until first server is found. No timeout!\n");

1932

1215

}

1933

1216

ret = avahi_simple_poll_iterate(s, -1);

1934

1217

} else {

1935

if(debug){

1936

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

1937

" it, or wait\n");

1218

if (debug){

1219

fprintf(stderr, "Check current_server if we should run it,"

1220

" or wait\n");

1938

1221

}

1939

1222

/* the current time */

1940

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1945

1228

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

1946

1229

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

1947

1230

waited_time.tv_sec = (now.tv_sec

1948

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

1231

- mc.current_server->last_seen.tv_sec);

1949

1232

waited_time.tv_nsec = (now.tv_nsec

1950

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

1233

- mc.current_server->last_seen.tv_nsec);

1951

1234

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

1952

1235

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

1953

1236

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

1955

1238

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

1956

1239

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

1957

1240

1958

if(debug){

1959

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

1960

block_time);

1241

if (debug){

1242

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1961

1243

}

1962

1244

1963

1245

if(block_time <= 0){

1964

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

1965

mc->current_server->port,

1966

mc->current_server->if_index,

1967

mc->current_server->af, mc);

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1968

1250

if(ret == 0){

1969

avahi_simple_poll_quit(s);

1251

avahi_simple_poll_quit(mc.simple_poll);

1970

1252

return 0;

1971

1253

}

1972

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1973

&mc->current_server->last_seen);

1255

&mc.current_server->last_seen);

1974

1256

if(ret == -1){

1975

1257

perror_plus("clock_gettime");

1976

1258

return -1;

1977

1259

}

1978

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

1260

mc.current_server = mc.current_server->next;

1979

1261

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

1980

1262

servers, but don't block */

1981

1263

}

1983

1265

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

1984

1266

}

1985

1267

if(ret != 0){

1986

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

1268

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

1987

1269

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

1988

1270

}

1989

1271

}

1990

1272

}

1991

1273

}

1992

1274

1993

__attribute__((nonnull))

1994

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

1995

const float delay){

1996

struct dirent **direntries = NULL;

1997

if(hookdir_fd == -1){

1998

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1999

| O_CLOEXEC);

2000

if(hookdir_fd == -1){

2001

if(errno == ENOENT){

2002

if(debug){

2003

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

2004

" found\n", hookdir);

2005

}

2006

} else {

2007

perror_plus("open");

2008

}

2009

return;

2010

}

2011

}

2012

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

2013

if(devnull == -1){

2014

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

2015

return;

2016

}

2017

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

2018

runnable_hook, alphasort);

2019

if(numhooks == -1){

2020

perror_plus("scandir");

2021

close(devnull);

2022

return;

2023

}

2024

struct dirent *direntry;

2025

int ret;

2026

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

2027

direntry = direntries[i];

2028

if(debug){

2029

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

2030

direntry->d_name);

2031

}

2032

pid_t hook_pid = fork();

2033

if(hook_pid == 0){

2034

/* Child */

2035

/* Raise privileges */

2036

errno = raise_privileges_permanently();

2037

if(errno != 0){

2038

perror_plus("Failed to raise privileges");

2039

_exit(EX_NOPERM);

2040

}

2041

/* Set group */

2042

errno = 0;

2043

ret = setgid(0);

2044

if(ret == -1){

2045

perror_plus("setgid");

2046

_exit(EX_NOPERM);

2047

}

2048

/* Reset supplementary groups */

2049

errno = 0;

2050

ret = setgroups(0, NULL);

2051

if(ret == -1){

2052

perror_plus("setgroups");

2053

_exit(EX_NOPERM);

2054

}

2055

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

2056

if(ret == -1){

2057

perror_plus("setenv");

2058

_exit(EX_OSERR);

2059

}

2060

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

2061

if(ret == -1){

2062

perror_plus("setenv");

2063

_exit(EX_OSERR);

2064

}

2065

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

2066

if(ret == -1){

2067

perror_plus("setenv");

2068

_exit(EX_OSERR);

2069

}

2070

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

2071

if(ret == -1){

2072

perror_plus("setenv");

2073

_exit(EX_OSERR);

2074

}

2075

char *delaystring;

2076

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

2077

if(ret == -1){

2078

perror_plus("asprintf");

2079

_exit(EX_OSERR);

2080

}

2081

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

2082

if(ret == -1){

2083

free(delaystring);

2084

perror_plus("setenv");

2085

_exit(EX_OSERR);

2086

}

2087

free(delaystring);

2088

if(connect_to != NULL){

2089

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

2090

if(ret == -1){

2091

perror_plus("setenv");

2092

_exit(EX_OSERR);

2093

}

2094

}

2095

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

2096

direntry->d_name,

2097

O_RDONLY));

2098

if(hook_fd == -1){

2099

perror_plus("openat");

2100

_exit(EXIT_FAILURE);

2101

}

2102

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

2103

perror_plus("close");

2104

_exit(EXIT_FAILURE);

2105

}

2106

ret = dup2(devnull, STDIN_FILENO);

2107

if(ret == -1){

2108

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

2109

_exit(EX_OSERR);

2110

}

2111

ret = close(devnull);

2112

if(ret == -1){

2113

perror_plus("close");

2114

_exit(EX_OSERR);

2115

}

2116

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2117

if(ret == -1){

2118

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

2119

_exit(EX_OSERR);

2120

}

2121

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

2122

environ) == -1){

2123

perror_plus("fexecve");

2124

_exit(EXIT_FAILURE);

2125

}

2126

} else {

2127

if(hook_pid == -1){

2128

perror_plus("fork");

2129

free(direntry);

2130

continue;

2131

}

2132

int status;

2133

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

2134

perror_plus("waitpid");

2135

free(direntry);

2136

continue;

2137

}

2138

if(WIFEXITED(status)){

2139

if(WEXITSTATUS(status) != 0){

2140

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

2141

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

2142

WEXITSTATUS(status));

2143

free(direntry);

2144

continue;

2145

}

2146

} else if(WIFSIGNALED(status)){

2147

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

2148

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

2149

WTERMSIG(status));

2150

free(direntry);

2151

continue;

2152

} else {

2153

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

2154

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

2155

free(direntry);

2156

continue;

2157

}

2158

}

2159

if(debug){

2160

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

2161

direntry->d_name);

2162

}

2163

free(direntry);

2164

}

2165

free(direntries);

2166

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

2167

perror_plus("close");

2168

} else {

2169

hookdir_fd = -1;

2170

}

2171

close(devnull);

2172

}

2173

2174

__attribute__((nonnull, warn_unused_result))

2175

int bring_up_interface(const char *const interface,

2176

const float delay){

2177

int old_errno = errno;

2178

int ret;

2179

struct ifreq network;

2180

unsigned int if_index = if_nametoindex(interface);

2181

if(if_index == 0){

2182

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

2183

errno = old_errno;

2184

return ENXIO;

2185

}

2186

2187

if(quit_now){

2188

errno = old_errno;

2189

return EINTR;

2190

}

2191

2192

if(not interface_is_up(interface)){

2193

int ret_errno = 0;

2194

int ioctl_errno = 0;

2195

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

2196

ret_errno = errno;

2197

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

2198

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

2199

errno = old_errno;

2200

return ret_errno;

2201

}

2202

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

2203

2204

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

2205

if(sd == -1){

2206

ret_errno = errno;

2207

perror_plus("socket");

2208

errno = old_errno;

2209

return ret_errno;

2210

}

2211

2212

if(quit_now){

2213

ret = close(sd);

2214

if(ret == -1){

2215

perror_plus("close");

2216

}

2217

errno = old_errno;

2218

return EINTR;

2219

}

2220

2221

if(debug){

2222

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

2223

interface);

2224

}

2225

2226

/* Raise privileges */

2227

ret_errno = raise_privileges();

2228

if(ret_errno != 0){

2229

errno = ret_errno;

2230

perror_plus("Failed to raise privileges");

2231

}

2232

2233

#ifdef __linux__

2234

int ret_linux;

2235

bool restore_loglevel = false;

2236

if(ret_errno == 0){

2237

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2238

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

2239

ret_linux = klogctl(8, NULL, 5);

2240

if(ret_linux == -1){

2241

perror_plus("klogctl");

2242

} else {

2243

restore_loglevel = true;

2244

}

2245

}

2246

#endif /* __linux__ */

2247

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

2248

ioctl_errno = errno;

2249

#ifdef __linux__

2250

if(restore_loglevel){

2251

ret_linux = klogctl(7, NULL, 0);

2252

if(ret_linux == -1){

2253

perror_plus("klogctl");

2254

}

2255

}

2256

#endif /* __linux__ */

2257

2258

/* If raise_privileges() succeeded above */

2259

if(ret_errno == 0){

2260

/* Lower privileges */

2261

ret_errno = lower_privileges();

2262

if(ret_errno != 0){

2263

errno = ret_errno;

2264

perror_plus("Failed to lower privileges");

2265

}

2266

}

2267

2268

/* Close the socket */

2269

ret = close(sd);

2270

if(ret == -1){

2271

perror_plus("close");

2272

}

2273

2274

if(ret_setflags == -1){

2275

errno = ioctl_errno;

2276

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2277

errno = old_errno;

2278

return ioctl_errno;

2279

}

2280

} else if(debug){

2281

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

2282

interface);

2283

}

2284

2285

/* Sleep checking until interface is running.

2286

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

2287

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

2288

if(interface_is_running(interface)){

2289

break;

2290

}

2291

struct timespec sleeptime = { .tv_nsec = 250000000 };

2292

ret = nanosleep(&sleeptime, NULL);

2293

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

2294

perror_plus("nanosleep");

2295

}

2296

}

2297

2298

errno = old_errno;

2299

return 0;

2300

}

2301

2302

__attribute__((nonnull, warn_unused_result))

2303

int take_down_interface(const char *const interface){

2304

int old_errno = errno;

2305

struct ifreq network;

2306

unsigned int if_index = if_nametoindex(interface);

2307

if(if_index == 0){

2308

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

2309

errno = old_errno;

2310

return ENXIO;

2311

}

2312

if(interface_is_up(interface)){

2313

int ret_errno = 0;

2314

int ioctl_errno = 0;

2315

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

2316

ret_errno = errno;

2317

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

2318

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

2319

errno = old_errno;

2320

return ret_errno;

2321

}

2322

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

2323

2324

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

2325

if(sd == -1){

2326

ret_errno = errno;

2327

perror_plus("socket");

2328

errno = old_errno;

2329

return ret_errno;

2330

}

2331

2332

if(debug){

2333

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

2334

interface);

2335

}

2336

2337

/* Raise privileges */

2338

ret_errno = raise_privileges();

2339

if(ret_errno != 0){

2340

errno = ret_errno;

2341

perror_plus("Failed to raise privileges");

2342

}

2343

2344

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

2345

ioctl_errno = errno;

2346

2347

/* If raise_privileges() succeeded above */

2348

if(ret_errno == 0){

2349

/* Lower privileges */

2350

ret_errno = lower_privileges();

2351

if(ret_errno != 0){

2352

errno = ret_errno;

2353

perror_plus("Failed to lower privileges");

2354

}

2355

}

2356

2357

/* Close the socket */

2358

int ret = close(sd);

2359

if(ret == -1){

2360

perror_plus("close");

2361

}

2362

2363

if(ret_setflags == -1){

2364

errno = ioctl_errno;

2365

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2366

errno = old_errno;

2367

return ioctl_errno;

2368

}

2369

} else if(debug){

2370

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

2371

interface);

2372

}

2373

2374

errno = old_errno;

2375

return 0;

2376

}

2377

2378

1275

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

2379

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

2380

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

2381

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

2382

.current_server = NULL, .interfaces = NULL,

2383

.interfaces_size = 0 };

2384

1276

AvahiSServiceBrowser *sb = NULL;

2385

error_t ret_errno;

1277

int error;

2386

1278

int ret;

2387

1279

intmax_t tmpmax;

2388

1280

char *tmp;

2389

1281

int exitcode = EXIT_SUCCESS;

2390

char *interfaces_to_take_down = NULL;

2391

size_t interfaces_to_take_down_size = 0;

2392

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

2393

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

2394

char *tempdir = NULL;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1288

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

1289

bool tempdir_created = false;

2395

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2396

1291

const char *seckey = PATHDIR "/" SECKEY;

2397

1292

const char *pubkey = PATHDIR "/" PUBKEY;

2398

const char *dh_params_file = NULL;

2399

char *interfaces_hooks = NULL;

2400

1293

2401

1294

bool gnutls_initialized = false;

2402

1295

bool gpgme_initialized = false;

2454

1347

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

2455

1348

" Diffie-Hellman key exchange",

2456

1349

.group = 2 },

2457

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

2458

.arg = "FILE",

2459

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

2460

" for the Diffie-Hellman key exchange",

2461

.group = 2 },

2462

1350

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

2463

1351

.arg = "STRING",

2464

1352

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

2469

1357

.group = 2 },

2470

1358

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

2471

1359

.arg = "SECONDS",

2472

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

2473

.group = 2 },

2474

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

2475

.arg = "DIR",

2476

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

1360

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

2477

1361

.group = 2 },

2478

1362

/*

2479

1363

* These reproduce what we would get without ARGP_NO_HELP

2498

1382

connect_to = arg;

2499

1383

break;

2500

1384

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

2501

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

2502

arg, (int)',');

2503

if(ret_errno != 0){

2504

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

2505

}

1385

interface = arg;

2506

1386

break;

2507

1387

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

2508

1388

seckey = arg;

2519

1399

}

2520

1400

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

2521

1401

break;

2522

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

2523

dh_params_file = arg;

2524

break;

2525

1402

case 130: /* --priority */

2526

1403

mc.priority = arg;

2527

1404

break;

2540

1417

argp_error(state, "Bad retry interval");

2541

1418

}

2542

1419

break;

2543

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

2544

hookdir = arg;

2545

break;

2546

1420

/*

2547

1421

* These reproduce what we would get without ARGP_NO_HELP

2548

1422

*/

2554

1428

argp_state_help(state, state->out_stream,

2555

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2556

1430

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

2557

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

1431

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

2558

1432

exit(argp_err_exit_status);

2559

1433

break;

2560

1434

default:

2567

1441

.args_doc = "",

2568

1442

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

2569

1443

" passwords from a Mandos server" };

2570

ret_errno = argp_parse(&argp, argc, argv,

2571

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2572

switch(ret_errno){

1444

ret = argp_parse(&argp, argc, argv,

1445

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1446

switch(ret){

2573

1447

case 0:

2574

1448

break;

2575

1449

case ENOMEM:

2576

1450

default:

2577

errno = ret_errno;

1451

errno = ret;

2578

1452

perror_plus("argp_parse");

2579

1453

exitcode = EX_OSERR;

2580

1454

goto end;

2583

1457

goto end;

2584

1458

}

2585

1459

}

2586

1460

2587

1461

{

2588

1462

/* Work around Debian bug #633582:

2589

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

2590

2591

/* Re-raise privileges */

2592

ret = raise_privileges();

2593

if(ret != 0){

2594

errno = ret;

2595

perror_plus("Failed to raise privileges");

2596

} else {

2597

struct stat st;

2598

2599

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

2600

int seckey_fd = open(seckey, O_RDONLY);

2601

if(seckey_fd == -1){

2602

perror_plus("open");

2603

} else {

2604

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

2605

if(ret == -1){

2606

perror_plus("fstat");

2607

} else {

2608

if(S_ISREG(st.st_mode)

2609

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

2610

ret = fchown(seckey_fd, uid, gid);

2611

if(ret == -1){

2612

perror_plus("fchown");

2613

}

2614

}

2615

}

2616

close(seckey_fd);

2617

}

2618

}

2619

2620

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

2621

int pubkey_fd = open(pubkey, O_RDONLY);

2622

if(pubkey_fd == -1){

2623

perror_plus("open");

2624

} else {

2625

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

2626

if(ret == -1){

2627

perror_plus("fstat");

2628

} else {

2629

if(S_ISREG(st.st_mode)

2630

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

2631

ret = fchown(pubkey_fd, uid, gid);

2632

if(ret == -1){

2633

perror_plus("fchown");

2634

}

2635

}

2636

}

2637

close(pubkey_fd);

2638

}

2639

}

2640

2641

if(dh_params_file != NULL

2642

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

2643

int dhparams_fd = open(dh_params_file, O_RDONLY);

2644

if(dhparams_fd == -1){

2645

perror_plus("open");

2646

} else {

2647

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

2648

if(ret == -1){

2649

perror_plus("fstat");

2650

} else {

2651

if(S_ISREG(st.st_mode)

2652

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

2653

ret = fchown(dhparams_fd, uid, gid);

2654

if(ret == -1){

2655

perror_plus("fchown");

2656

}

2657

}

2658

}

2659

close(dhparams_fd);

2660

}

2661

}

2662

2663

/* Lower privileges */

2664

ret = lower_privileges();

2665

if(ret != 0){

2666

errno = ret;

2667

perror_plus("Failed to lower privileges");

2668

}

2669

}

2670

}

2671

2672

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

2673

{

2674

char *interface = NULL;

2675

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

2676

interface))){

2677

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

2678

and if_nametoindex(interface) == 0){

2679

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

2680

fprintf_plus(stderr, "Not using nonexisting interface"

2681

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

2682

}

2683

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

2684

interface = NULL;

2685

}

2686

}

2687

}

2688

2689

/* Run network hooks */

2690

{

2691

if(mc.interfaces != NULL){

2692

interfaces_hooks = malloc(mc.interfaces_size);

2693

if(interfaces_hooks == NULL){

2694

perror_plus("malloc");

2695

goto end;

2696

}

2697

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

2698

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

2699

}

2700

run_network_hooks("start", interfaces_hooks != NULL ?

2701

interfaces_hooks : "", delay);

1463

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

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

2702

1519

}

2703

1520

2704

1521

if(not debug){

2705

1522

avahi_set_log_function(empty_log);

2706

1523

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

interface = strdup(direntries[0]->d_name);

1532

if(debug){

1533

fprintf(stderr, "Using interface \"%s\"\n", interface);

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

2707

1549

2708

1550

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

2709

1551

from the signal handler */

2710

1552

/* Initialize the pseudo-RNG for Avahi */

2711

1553

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

2712

simple_poll = avahi_simple_poll_new();

2713

if(simple_poll == NULL){

2714

fprintf_plus(stderr,

2715

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

1554

mc.simple_poll = avahi_simple_poll_new();

1555

if(mc.simple_poll == NULL){

1556

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

2716

1557

exitcode = EX_UNAVAILABLE;

2717

1558

goto end;

2718

1559

}

2780

1621

}

2781

1622

}

2782

1623

2783

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

2784

if(mc.interfaces == NULL){

2785

struct dirent **direntries = NULL;

2786

/* Look for any good interfaces */

2787

ret = scandir(sys_class_net, &direntries, good_interface,

2788

alphasort);

2789

if(ret >= 1){

2790

/* Add all found interfaces to interfaces list */

2791

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

2792

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

2793

direntries[i]->d_name);

2794

if(ret_errno != 0){

2795

errno = ret_errno;

2796

perror_plus("argz_add");

2797

free(direntries[i]);

2798

continue;

2799

}

2800

if(debug){

2801

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

2802

direntries[i]->d_name);

2803

}

2804

free(direntries[i]);

2805

}

2806

free(direntries);

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

1709

}

1710

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

break;

1729

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

2807

1760

} else {

2808

if(ret == 0){

2809

free(direntries);

2810

}

2811

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

2812

exitcode = EXIT_FAILURE;

2813

goto end;

2814

}

2815

}

2816

2817

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

2818

{

2819

char *interface = NULL;

2820

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

2821

interface))){

2822

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

2823

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

2824

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

2825

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

2826

interface);

2827

interface = NULL;

2828

while((interface = argz_next(mc.interfaces,

2829

mc.interfaces_size, interface))){

2830

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

2831

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

2832

interface);

2833

interface = NULL;

2834

}

2835

}

2836

break;

2837

}

2838

bool interface_was_up = interface_is_up(interface);

2839

errno = bring_up_interface(interface, delay);

2840

if(not interface_was_up){

2841

if(errno != 0){

2842

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

2843

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

2844

} else {

2845

errno = argz_add(&interfaces_to_take_down,

2846

&interfaces_to_take_down_size,

2847

interface);

2848

if(errno != 0){

2849

perror_plus("argz_add");

2850

}

2851

}

2852

}

2853

}

2854

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

2855

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

2856

}

2857

}

2858

2859

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

2860

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

2861

if(debug){

2862

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

2863

mc.interfaces);

2864

}

2865

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

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

2866

1767

}

2867

1768

2868

1769

if(quit_now){

2869

1770

goto end;

2870

1771

}

2871

1772

2872

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

1773

ret = init_gnutls_global(pubkey, seckey);

2873

1774

if(ret == -1){

2874

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

1775

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

2875

1776

exitcode = EX_UNAVAILABLE;

2876

1777

goto end;

2877

1778

} else {

2882

1783

goto end;

2883

1784

}

2884

1785

2885

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

2886

tempdir = mkdtemp(run_tempdir);

2887

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

2888

if(debug){

2889

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

2890

run_tempdir, old_tempdir);

2891

}

2892

tempdir = mkdtemp(old_tempdir);

2893

}

2894

if(tempdir == NULL){

1786

if(mkdtemp(tempdir) == NULL){

2895

1787

perror_plus("mkdtemp");

2896

1788

goto end;

2897

1789

}

1790

tempdir_created = true;

2898

1791

2899

1792

if(quit_now){

2900

1793

goto end;

2901

1794

}

2902

1795

2903

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

2904

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

1796

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

1797

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

2905

1798

exitcode = EX_UNAVAILABLE;

2906

1799

goto end;

2907

1800

} else {

2916

1809

/* Connect directly, do not use Zeroconf */

2917

1810

/* (Mainly meant for debugging) */

2918

1811

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

2919

2920

1812

if(address == NULL){

2921

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

1813

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

2922

1814

exitcode = EX_USAGE;

2923

1815

goto end;

2924

1816

}

2927

1819

goto end;

2928

1820

}

2929

1821

2930

in_port_t port;

1822

uint16_t port;

2931

1823

errno = 0;

2932

1824

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

2933

1825

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

2934

or tmpmax != (in_port_t)tmpmax){

2935

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2936

1828

exitcode = EX_USAGE;

2937

1829

goto end;

2938

1830

}

2939

1831

2940

1832

if(quit_now){

2941

1833

goto end;

2942

1834

}

2943

1835

2944

port = (in_port_t)tmpmax;

1836

port = (uint16_t)tmpmax;

2945

1837

*address = '\0';

2946

1838

/* Colon in address indicates IPv6 */

2947

1839

int af;

2963

1855

}

2964

1856

2965

1857

while(not quit_now){

2966

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

2967

&mc);

1858

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

2968

1859

if(quit_now or ret == 0){

2969

1860

break;

2970

1861

}

2971

1862

if(debug){

2972

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

2973

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2974

1865

}

2975

sleep((unsigned int)retry_interval);

1866

sleep((int)retry_interval);

2976

1867

}

2977

1868

2978

if(not quit_now){

1869

if (not quit_now){

2979

1870

exitcode = EXIT_SUCCESS;

2980

1871

}

2981

1872

2982

1873

goto end;

2983

1874

}

2984

1875

2996

1887

config.publish_domain = 0;

2997

1888

2998

1889

/* Allocate a new server */

2999

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3000

&config, NULL, NULL, &ret);

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

3001

1893

3002

1894

/* Free the Avahi configuration data */

3003

1895

avahi_server_config_free(&config);

3005

1897

3006

1898

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

3007

1899

if(mc.server == NULL){

3008

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

3009

avahi_strerror(ret));

1900

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

1901

avahi_strerror(error));

3010

1902

exitcode = EX_UNAVAILABLE;

3011

1903

goto end;

3012

1904

}

3018

1910

/* Create the Avahi service browser */

3019

1911

sb = avahi_s_service_browser_new(mc.server, if_index,

3020

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

3021

NULL, 0, browse_callback,

3022

(void *)&mc);

1913

NULL, 0, browse_callback, NULL);

3023

1914

if(sb == NULL){

3024

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

3025

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

3026

1917

exitcode = EX_UNAVAILABLE;

3027

1918

goto end;

3028

1919

}

3034

1925

/* Run the main loop */

3035

1926

3036

1927

if(debug){

3037

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

1928

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

3038

1929

}

3039

3040

ret = avahi_loop_with_timeout(simple_poll,

3041

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

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

3042

1933

if(debug){

3043

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

3044

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

1934

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

1935

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

3045

1936

}

3046

1937

3047

1938

end:

3048

1939

3049

1940

if(debug){

3050

if(signal_received){

3051

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

3052

argv[0], signal_received,

3053

strsignal(signal_received));

3054

} else {

3055

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

3056

}

1941

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

3057

1942

}

3058

1943

3059

1944

/* Cleanup things */

3060

free(mc.interfaces);

3061

3062

1945

if(sb != NULL)

3063

1946

avahi_s_service_browser_free(sb);

3064

1947

3065

1948

if(mc.server != NULL)

3066

1949

avahi_server_free(mc.server);

3067

1950

3068

if(simple_poll != NULL)

3069

avahi_simple_poll_free(simple_poll);

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

3070

1953

3071

1954

if(gnutls_initialized){

3072

1955

gnutls_certificate_free_credentials(mc.cred);

1956

gnutls_global_deinit();

3073

1957

gnutls_dh_params_deinit(mc.dh_params);

3074

1958

}

3075

1959

3076

1960

if(gpgme_initialized){

3077

1961

gpgme_release(mc.ctx);

3078

1962

}

3079

1963

3080

1964

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

3081

1965

has seen */

3082

1966

if(mc.current_server != NULL){

3083

1967

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

3084

1968

while(mc.current_server != NULL){

3085

1969

server *next = mc.current_server->next;

3086

#ifdef __GNUC__

3087

#pragma GCC diagnostic push

3088

#pragma GCC diagnostic ignored "-Wcast-qual"

3089

#endif

3090

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

3091

#ifdef __GNUC__

3092

#pragma GCC diagnostic pop

3093

#endif

3094

1970

free(mc.current_server);

3095

1971

mc.current_server = next;

3096

1972

}

3097

1973

}

3098

1974

3099

/* Re-raise privileges */

3100

{

3101

ret = raise_privileges();

3102

if(ret != 0){

3103

errno = ret;

3104

perror_plus("Failed to raise privileges");

3105

} else {

3106

3107

/* Run network hooks */

3108

run_network_hooks("stop", interfaces_hooks != NULL ?

3109

interfaces_hooks : "", delay);

3110

3111

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

3112

{

3113

char *interface = NULL;

3114

while((interface = argz_next(interfaces_to_take_down,

3115

interfaces_to_take_down_size,

3116

interface))){

3117

ret = take_down_interface(interface);

3118

if(ret != 0){

3119

errno = ret;

3120

perror_plus("Failed to take down interface");

3121

}

3122

}

3123

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

3124

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

3125

" down\n");

3126

}

3127

}

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

3128

1982

}

3129

3130

ret = lower_privileges_permanently();

3131

if(ret != 0){

3132

errno = ret;

3133

perror_plus("Failed to lower privileges permanently");

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1992

}

1993

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

3134

2004

}

3135

2005

}

3136

2006

3137

free(interfaces_to_take_down);

3138

free(interfaces_hooks);

3139

3140

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

3141

uintmax_t level){

2007

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

2008

if(tempdir_created){

3142

2009

struct dirent **direntries = NULL;

3143

int dret;

3144

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

3145

O_RDONLY

3146

| O_NOFOLLOW

3147

| O_DIRECTORY

3148

| O_PATH));

3149

if(dir_fd == -1){

3150

perror_plus("open");

3151

return;

3152

}

3153

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

3154

notdotentries, alphasort);

3155

if(numentries >= 0){

2010

struct dirent *direntry = NULL;

2011

int numentries = scandir(tempdir, &direntries, notdotentries,

2012

alphasort);

2013

if (numentries > 0){

3156

2014

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

3157

if(debug){

3158

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

3159

dirname, direntries[i]->d_name);

3160

}

3161

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

3162

if(dret == -1){

3163

if(errno == EISDIR){

3164

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

3165

AT_REMOVEDIR);

3166

}

3167

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

3168

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

3169

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

3170

/* Recurse only in this special case */

3171

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

3172

dret = 0;

3173

}

3174

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

3175

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

3176

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

3177

}

3178

}

3179

free(direntries[i]);

3180

}

3181

3182

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

3183

free(direntries);

3184

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3185

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

3186

perror_plus("rmdir");

3187

}

3188

} else {

3189

perror_plus("scandirat");

3190

}

3191

close(dir_fd);

3192

}

3193

3194

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

3195

if(tempdir != NULL){

3196

clean_dir_at(-1, tempdir, 0);

2015

direntry = direntries[i];

2016

char *fullname = NULL;

2017

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

2018

direntry->d_name);

2019

if(ret < 0){

2020

perror_plus("asprintf");

2021

continue;

2022

}

2023

ret = remove(fullname);

2024

if(ret == -1){

2025

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

2026

strerror(errno));

2027

}

2028

free(fullname);

2029

}

2030

}

2031

2032

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

2033

free(direntries);

2034

if (numentries == -1){

2035

perror_plus("scandir");

2036

}

2037

ret = rmdir(tempdir);

2038

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

2039

perror_plus("rmdir");

2040

}

3197

2041

}

3198

2042

3199

2043

if(quit_now){