/mandos/release : revision 237.22.2

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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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22

* 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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*/

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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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#define _GNU_SOURCE /* program_invocation_short_name,

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TEMP_FAILURE_RETRY(), O_CLOEXEC,

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scandirat(), asprintf() */

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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(), remove() */

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

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

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

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strtof(), abort() */

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48

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

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#include <argp.h> /* argp_program_version,

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argp_program_bug_address,

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struct argp_option,

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struct argp_state, argp_error(),

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argp_state_help,

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ARGP_HELP_STD_HELP,

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ARGP_HELP_EXIT_ERR,

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ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,

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argp_err_exit_status,

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ARGP_ERR_UNKNOWN, struct argp,

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argp_parse(), ARGP_IN_ORDER,

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ARGP_NO_HELP */

57

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

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#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,

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seteuid(), setuid(), pid_t,

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setgid(), getuid(), getgid() */

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#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),

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seteuid(), setuid(), close(),

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ssize_t, read(), fork(), setgid(),

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_exit(), dup2(), STDIN_FILENO,

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STDERR_FILENO, STDOUT_FILENO,

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fexecve(), write(), getuid(),

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getgid(), fchown(), symlink(),

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sleep(), unlinkat(), pause() */

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#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,

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sa_family_t, struct sockaddr_in,

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htons(), IN6_IS_ADDR_LINKLOCAL,

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN,

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ntohl(), IPPROTO_IP */

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#include <time.h> /* struct timespec, clock_gettime(),

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CLOCK_MONOTONIC, time_t, struct tm,

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gmtime_r(), clock_settime(),

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CLOCK_REALTIME, nanosleep() */

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#include <errno.h> /* errno,

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program_invocation_short_name,

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EINTR, EINVAL, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, error_t,

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ENOMEM, EISDIR, ENOTEMPTY */

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

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vfprintf(), off_t, SEEK_SET,

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stdout, fwrite(), ferror(),

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fflush(), asprintf() */

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#include <stdarg.h> /* va_list, va_start(), vfprintf() */

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#include <stdlib.h> /* realloc(), free(), malloc(),

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getenv(), EXIT_FAILURE, setenv(),

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EXIT_SUCCESS, strtof(), strtod(),

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srand(), mkdtemp(), abort() */

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

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strerror(), strncpy(), strspn(),

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memcpy(), strrchr(), strchr(),

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strsignal() */

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

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O_PATH, O_CLOEXEC, openat(),

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O_NOFOLLOW, AT_REMOVEDIR */

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

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#include <sys/stat.h> /* struct stat, fstat(), fstatat(),

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S_ISREG(), S_IXUSR, S_IXGRP,

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S_IXOTH, lstat() */

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#include <net/if.h> /* IF_NAMESIZE, if_indextoname(),

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if_nametoindex(), SIOCGIFFLAGS,

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IFF_LOOPBACK, IFF_POINTOPOINT,

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IFF_BROADCAST, IFF_NOARP, IFF_UP,

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IFF_RUNNING, SIOCSIFFLAGS */

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#include <sysexits.h> /* EX_NOPERM, EX_OSERR,

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EX_UNAVAILABLE, EX_USAGE */

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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/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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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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#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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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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#include <signal.h> /* sigemptyset(), sigaddset(),

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sigaction(), SIGTERM, sig_atomic_t,

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

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WEXITSTATUS(), WIFSIGNALED(),

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WTERMSIG() */

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#include <signal.h> /* kill(), SIGTERM, struct sigaction,

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SIG_DFL, sigemptyset(),

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sigaddset(), SIGINT, SIGHUP,

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SIG_IGN, raise() */

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#include <sys/socket.h> /* struct sockaddr_storage, AF_INET6,

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PF_INET6, AF_INET, PF_INET,

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socket(), SOCK_STREAM,

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SOCK_CLOEXEC, struct sockaddr,

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connect(), SOCK_DGRAM */

124

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

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argz_delete(), argz_stringify(),

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argz_add(), argz_count() */

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#include <inttypes.h> /* PRIuMAX, uintmax_t, uint32_t,

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PRIdMAX, PRIu16, intmax_t,

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strtoimax() */

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

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

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

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EAI_SYSTEM, gai_strerror() */

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

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

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alphasort(), scandir() */

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#include <limits.h> /* INT_MAX */

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139

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#ifdef __linux__

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

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106

154

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/* GnuTLS */

155

108

#include <gnutls/gnutls.h> /* All GnuTLS types, constants and

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functions: gnutls_*, GNUTLS_* */

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#if GNUTLS_VERSION_NUMBER < 0x030600

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functions:

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gnutls_*

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

159

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/* gnutls_certificate_set_openpgp_key_file(),

160

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GNUTLS_OPENPGP_FMT_BASE64 */

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#elif GNUTLS_VERSION_NUMBER >= 0x030606

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

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GNUTLS_PKCS_NULL_PASSWORD */

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#endif

165

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166

117

/* GPGME */

167

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

168

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functions:

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gpgme_*, GPG_ERR_NO_*,

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GPGME_IMPORT_*

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GPGME_PROTOCOL_OpenPGP */

120

gpgme_*

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GPGME_PROTOCOL_OpenPGP,

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GPG_ERR_NO_* */

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#define BUFFER_SIZE 256

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125

175

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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#define TLS_PRIVKEY "tls-privkey.pem"

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#define TLS_PUBKEY "tls-pubkey.pem"

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129

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

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182

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bool debug = false;

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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;

199

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struct timespec last_seen;

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204

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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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161

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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169

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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perror(print_text);

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}

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

182

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

233

183

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

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va_list ap;

235

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va_start (ap, format);

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186

237

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

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}

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242

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/*

244

194

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

245

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* "buffer_length" is how much is already used.

246

196

*/

247

__attribute__((nonnull, warn_unused_result))

248

197

size_t incbuffer(char **buffer, size_t buffer_length,

249

198

size_t buffer_capacity){

250

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

252

if(new_buf == NULL){

253

int old_errno = errno;

254

free(*buffer);

255

errno = old_errno;

256

*buffer = NULL;

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

201

if(buffer == NULL){

257

202

return 0;

258

203

}

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*buffer = new_buf;

260

204

buffer_capacity += BUFFER_SIZE;

261

205

}

262

206

return buffer_capacity;

263

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}

264

208

265

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

266

__attribute__((nonnull, warn_unused_result))

267

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

268

int af, server **current_server){

210

bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

211

int af){

269

212

int ret;

270

213

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

271

214

if(new_server == NULL){

278

221

.af = af };

279

222

if(new_server->ip == NULL){

280

223

perror_plus("strdup");

281

free(new_server);

282

return false;

283

}

284

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

285

if(ret == -1){

286

perror_plus("clock_gettime");

287

#ifdef __GNUC__

288

#pragma GCC diagnostic push

289

#pragma GCC diagnostic ignored "-Wcast-qual"

290

#endif

291

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

292

#ifdef __GNUC__

293

#pragma GCC diagnostic pop

294

#endif

295

free(new_server);

296

224

return false;

297

225

}

298

226

/* Special case of first server */

299

if(*current_server == NULL){

227

if (mc.current_server == NULL){

300

228

new_server->next = new_server;

301

229

new_server->prev = new_server;

302

*current_server = new_server;

230

mc.current_server = new_server;

231

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

303

232

} else {

304

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

305

new_server->next = *current_server;

306

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

233

new_server->next = mc.current_server;

234

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

307

235

new_server->prev->next = new_server;

308

(*current_server)->prev = new_server;

236

mc.current_server->prev = new_server;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

309

242

}

310

243

return true;

311

244

}

312

245

313

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

314

__attribute__((warn_unused_result))

315

int raise_privileges(void){

316

int old_errno = errno;

317

int ret = 0;

318

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

319

ret = errno;

320

}

321

errno = old_errno;

322

return ret;

323

}

324

325

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

326

__attribute__((warn_unused_result))

327

int raise_privileges_permanently(void){

328

int old_errno = errno;

329

int ret = raise_privileges();

330

if(ret != 0){

331

errno = old_errno;

332

return ret;

333

}

334

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

335

ret = errno;

336

}

337

errno = old_errno;

338

return ret;

339

}

340

341

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

342

__attribute__((warn_unused_result))

343

int lower_privileges(void){

344

int old_errno = errno;

345

int ret = 0;

346

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

347

ret = errno;

348

}

349

errno = old_errno;

350

return ret;

351

}

352

353

/* Lower privileges permanently */

354

__attribute__((warn_unused_result))

355

int lower_privileges_permanently(void){

356

int old_errno = errno;

357

int ret = 0;

358

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

359

ret = errno;

360

}

361

errno = old_errno;

362

return ret;

363

}

364

365

246

/*

366

247

* Initialize GPGME.

367

248

*/

368

__attribute__((nonnull, warn_unused_result))

369

static bool init_gpgme(const char * const seckey,

370

const char * const pubkey,

371

const char * const tempdir,

372

mandos_context *mc){

249

static bool init_gpgme(const char *seckey, const char *pubkey,

250

const char *tempdir){

373

251

gpgme_error_t rc;

374

252

gpgme_engine_info_t engine_info;

375

253

254

376

255

/*

377

256

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

378

257

*/

379

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

380

259

int ret;

381

260

int fd;

382

261

gpgme_data_t pgp_data;

387

266

return false;

388

267

}

389

268

390

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

391

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

392

do {

393

{

394

time_t currtime = time(NULL);

395

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

396

struct tm tm;

397

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

398

perror_plus("gmtime_r");

399

break;

400

}

401

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

402

break;

403

}

404

if(debug){

405

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

406

}

407

} else {

408

if(debug){

409

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

410

}

411

}

412

}

413

struct stat keystat;

414

ret = fstat(fd, &keystat);

415

if(ret != 0){

416

perror_plus("fstat");

417

break;

418

}

419

ret = raise_privileges();

420

if(ret != 0){

421

errno = ret;

422

perror_plus("Failed to raise privileges");

423

break;

424

}

425

if(debug){

426

fprintf_plus(stderr,

427

"Setting system clock to key file mtime");

428

}

429

if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){

430

perror_plus("clock_settime");

431

}

432

ret = lower_privileges();

433

if(ret != 0){

434

errno = ret;

435

perror_plus("Failed to lower privileges");

436

}

437

} while(false);

438

439

269

rc = gpgme_data_new_from_fd(&pgp_data, fd);

440

270

if(rc != GPG_ERR_NO_ERROR){

441

271

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

443

273

return false;

444

274

}

445

275

446

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

276

rc = gpgme_op_import(mc.ctx, pgp_data);

447

277

if(rc != GPG_ERR_NO_ERROR){

448

278

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

449

279

gpgme_strsource(rc), gpgme_strerror(rc));

450

280

return false;

451

281

}

452

{

453

gpgme_import_result_t import_result

454

= gpgme_op_import_result(mc->ctx);

455

if((import_result->imported < 1

456

or import_result->not_imported > 0)

457

and import_result->unchanged == 0){

458

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

459

fprintf_plus(stderr,

460

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

461

import_result->considered);

462

fprintf_plus(stderr,

463

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

464

import_result->no_user_id);

465

fprintf_plus(stderr,

466

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

467

import_result->imported);

468

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

469

import_result->imported_rsa);

470

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

471

import_result->unchanged);

472

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

473

import_result->new_user_ids);

474

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

475

import_result->new_sub_keys);

476

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

477

import_result->new_signatures);

478

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

479

import_result->new_revocations);

480

fprintf_plus(stderr,

481

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

482

import_result->secret_read);

483

fprintf_plus(stderr,

484

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

485

import_result->secret_imported);

486

fprintf_plus(stderr,

487

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

488

import_result->secret_unchanged);

489

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

490

import_result->not_imported);

491

for(gpgme_import_status_t import_status

492

= import_result->imports;

493

import_status != NULL;

494

import_status = import_status->next){

495

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

496

import_status->fpr);

497

if(import_status->result != GPG_ERR_NO_ERROR){

498

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

499

gpgme_strsource(import_status->result),

500

gpgme_strerror(import_status->result));

501

}

502

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

503

fprintf_plus(stderr,

504

import_status->status & GPGME_IMPORT_NEW

505

? "The key was new.\n"

506

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

507

fprintf_plus(stderr,

508

import_status->status & GPGME_IMPORT_UID

509

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

510

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

511

fprintf_plus(stderr,

512

import_status->status & GPGME_IMPORT_SIG

513

? "The key contained new signatures.\n"

514

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

515

fprintf_plus(stderr,

516

import_status->status & GPGME_IMPORT_SUBKEY

517

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

518

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

519

fprintf_plus(stderr,

520

import_status->status & GPGME_IMPORT_SECRET

521

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

522

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

523

}

524

return false;

525

}

526

}

527

282

528

ret = close(fd);

283

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

529

284

if(ret == -1){

530

285

perror_plus("close");

531

286

}

568

323

}

569

324

570

325

/* Create new GPGME "context" */

571

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

326

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

572

327

if(rc != GPG_ERR_NO_ERROR){

573

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

574

gpgme_strsource(rc), gpgme_strerror(rc));

328

fprintf_plus(stderr, "Mandos plugin mandos-client: "

329

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

330

gpgme_strerror(rc));

575

331

return false;

576

332

}

577

333

586

342

* Decrypt OpenPGP data.

587

343

* Returns -1 on error

588

344

*/

589

__attribute__((nonnull, warn_unused_result))

590

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

591

346

size_t crypto_size,

592

char **plaintext,

593

mandos_context *mc){

347

char **plaintext){

594

348

gpgme_data_t dh_crypto, dh_plain;

595

349

gpgme_error_t rc;

596

350

ssize_t ret;

613

367

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

614

368

rc = gpgme_data_new(&dh_plain);

615

369

if(rc != GPG_ERR_NO_ERROR){

616

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

370

fprintf_plus(stderr, "Mandos plugin mandos-client: "

371

"bad gpgme_data_new: %s: %s\n",

617

372

gpgme_strsource(rc), gpgme_strerror(rc));

618

373

gpgme_data_release(dh_crypto);

619

374

return -1;

621

376

622

377

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

623

378

data buffer */

624

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

379

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

625

380

if(rc != GPG_ERR_NO_ERROR){

626

381

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

627

382

gpgme_strsource(rc), gpgme_strerror(rc));

628

383

plaintext_length = -1;

629

384

if(debug){

630

385

gpgme_decrypt_result_t result;

631

result = gpgme_op_decrypt_result(mc->ctx);

386

result = gpgme_op_decrypt_result(mc.ctx);

632

387

if(result == NULL){

633

388

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

634

389

} else {

635

if(result->unsupported_algorithm != NULL) {

636

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

637

result->unsupported_algorithm);

638

}

639

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

640

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

390

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

391

result->unsupported_algorithm);

392

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

393

result->wrong_key_usage);

641

394

if(result->file_name != NULL){

642

395

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

643

396

}

644

645

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

646

r = r->next){

397

gpgme_recipient_t recipient;

398

recipient = result->recipients;

399

while(recipient != NULL){

647

400

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

648

gpgme_pubkey_algo_name(r->pubkey_algo));

649

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

401

gpgme_pubkey_algo_name

402

(recipient->pubkey_algo));

403

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

650

404

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

651

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

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

407

recipient = recipient->next;

652

408

}

653

409

}

654

410

}

710

466

return plaintext_length;

711

467

}

712

468

713

__attribute__((warn_unused_result, const))

714

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

715

if(str == NULL)

716

return "(unknown)";

717

return str;

718

}

719

720

__attribute__((warn_unused_result))

721

static const char *safer_gnutls_strerror(int value){

722

const char *ret = gnutls_strerror(value);

723

return safe_string(ret);

469

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

724

475

}

725

476

726

477

/* GnuTLS log function callback */

727

__attribute__((nonnull))

728

478

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

729

479

const char* string){

730

480

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

731

481

}

732

482

733

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

734

483

static int init_gnutls_global(const char *pubkeyfilename,

735

const char *seckeyfilename,

736

const char *dhparamsfilename,

737

mandos_context *mc){

484

const char *seckeyfilename){

738

485

int ret;

739

486

740

487

if(debug){

741

488

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

742

489

}

743

490

491

ret = gnutls_global_init();

492

if(ret != GNUTLS_E_SUCCESS){

493

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

494

safer_gnutls_strerror(ret));

495

return -1;

496

}

497

744

498

if(debug){

745

499

/* "Use a log level over 10 to enable all debugging options."

746

500

* - GnuTLS manual

750

504

}

751

505

752

506

/* OpenPGP credentials */

753

ret = gnutls_certificate_allocate_credentials(&mc->cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

754

508

if(ret != GNUTLS_E_SUCCESS){

755

509

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

756

510

safer_gnutls_strerror(ret));

511

gnutls_global_deinit();

757

512

return -1;

758

513

}

759

514

760

515

if(debug){

761

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

762

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

516

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

517

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

763

518

pubkeyfilename,

764

519

seckeyfilename);

765

520

}

766

521

767

#if GNUTLS_VERSION_NUMBER >= 0x030606

768

ret = gnutls_certificate_set_rawpk_key_file

769

(mc->cred, pubkeyfilename, seckeyfilename,

770

GNUTLS_X509_FMT_PEM, /* format */

771

NULL, /* pass */

772

/* key_usage */

773

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

774

NULL, /* names */

775

0, /* names_length */

776

/* privkey_flags */

777

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

778

0); /* pkcs11_flags */

779

#elif GNUTLS_VERSION_NUMBER < 0x030600

780

522

ret = gnutls_certificate_set_openpgp_key_file

781

(mc->cred, pubkeyfilename, seckeyfilename,

523

(mc.cred, pubkeyfilename, seckeyfilename,

782

524

GNUTLS_OPENPGP_FMT_BASE64);

783

#else

784

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

785

#endif

786

525

if(ret != GNUTLS_E_SUCCESS){

787

526

fprintf_plus(stderr,

788

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

527

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

789

528

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

790

529

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

791

530

safer_gnutls_strerror(ret));

793

532

}

794

533

795

534

/* GnuTLS server initialization */

796

ret = gnutls_dh_params_init(&mc->dh_params);

535

ret = gnutls_dh_params_init(&mc.dh_params);

797

536

if(ret != GNUTLS_E_SUCCESS){

798

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

799

538

" initialization: %s\n",

800

539

safer_gnutls_strerror(ret));

801

540

goto globalfail;

802

541

}

803

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

804

if(dhparamsfilename != NULL){

805

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

806

do {

807

int dhpfile = open(dhparamsfilename, O_RDONLY);

808

if(dhpfile == -1){

809

perror_plus("open");

810

dhparamsfilename = NULL;

811

break;

812

}

813

size_t params_capacity = 0;

814

while(true){

815

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

816

(size_t)params.size,

817

(size_t)params_capacity);

818

if(params_capacity == 0){

819

perror_plus("incbuffer");

820

free(params.data);

821

params.data = NULL;

822

dhparamsfilename = NULL;

823

break;

824

}

825

ssize_t bytes_read = read(dhpfile,

826

params.data + params.size,

827

BUFFER_SIZE);

828

/* EOF */

829

if(bytes_read == 0){

830

break;

831

}

832

/* check bytes_read for failure */

833

if(bytes_read < 0){

834

perror_plus("read");

835

free(params.data);

836

params.data = NULL;

837

dhparamsfilename = NULL;

838

break;

839

}

840

params.size += (unsigned int)bytes_read;

841

}

842

ret = close(dhpfile);

843

if(ret == -1){

844

perror_plus("close");

845

}

846

if(params.data == NULL){

847

dhparamsfilename = NULL;

848

}

849

if(dhparamsfilename == NULL){

850

break;

851

}

852

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

853

GNUTLS_X509_FMT_PEM);

854

if(ret != GNUTLS_E_SUCCESS){

855

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

856

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

857

safer_gnutls_strerror(ret));

858

dhparamsfilename = NULL;

859

}

860

free(params.data);

861

} while(false);

862

}

863

if(dhparamsfilename == NULL){

864

if(mc->dh_bits == 0){

865

#if GNUTLS_VERSION_NUMBER < 0x030600

866

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

867

/* Try to read the private key file */

868

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

869

do {

870

int secfile = open(seckeyfilename, O_RDONLY);

871

if(secfile == -1){

872

perror_plus("open");

873

break;

874

}

875

size_t buffer_capacity = 0;

876

while(true){

877

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

878

(size_t)buffer.size,

879

(size_t)buffer_capacity);

880

if(buffer_capacity == 0){

881

perror_plus("incbuffer");

882

free(buffer.data);

883

buffer.data = NULL;

884

break;

885

}

886

ssize_t bytes_read = read(secfile,

887

buffer.data + buffer.size,

888

BUFFER_SIZE);

889

/* EOF */

890

if(bytes_read == 0){

891

break;

892

}

893

/* check bytes_read for failure */

894

if(bytes_read < 0){

895

perror_plus("read");

896

free(buffer.data);

897

buffer.data = NULL;

898

break;

899

}

900

buffer.size += (unsigned int)bytes_read;

901

}

902

close(secfile);

903

} while(false);

904

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

905

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

906

if(buffer.data != NULL){

907

{

908

gnutls_openpgp_privkey_t privkey = NULL;

909

ret = gnutls_openpgp_privkey_init(&privkey);

910

if(ret != GNUTLS_E_SUCCESS){

911

fprintf_plus(stderr, "Error initializing OpenPGP key"

912

" structure: %s",

913

safer_gnutls_strerror(ret));

914

free(buffer.data);

915

buffer.data = NULL;

916

} else {

917

ret = gnutls_openpgp_privkey_import

918

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

919

if(ret != GNUTLS_E_SUCCESS){

920

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

921

safer_gnutls_strerror(ret));

922

privkey = NULL;

923

}

924

free(buffer.data);

925

buffer.data = NULL;

926

if(privkey != NULL){

927

/* Use private key to suggest an appropriate

928

sec_param */

929

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

930

gnutls_openpgp_privkey_deinit(privkey);

931

if(debug){

932

fprintf_plus(stderr, "This OpenPGP key implies using"

933

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

934

safe_string(gnutls_sec_param_get_name

935

(sec_param)));

936

}

937

}

938

}

939

}

940

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

941

/* Err on the side of caution */

942

sec_param = GNUTLS_SEC_PARAM_ULTRA;

943

if(debug){

944

fprintf_plus(stderr, "Falling back to security parameter"

945

" \"%s\"\n",

946

safe_string(gnutls_sec_param_get_name

947

(sec_param)));

948

}

949

}

950

}

951

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

952

if(uret != 0){

953

mc->dh_bits = uret;

954

if(debug){

955

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

956

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

957

safe_string(gnutls_sec_param_get_name

958

(sec_param)),

959

mc->dh_bits);

960

}

961

} else {

962

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

963

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

964

safe_string(gnutls_sec_param_get_name

965

(sec_param)),

966

safer_gnutls_strerror(ret));

967

goto globalfail;

968

}

969

#endif

970

} else { /* dh_bits != 0 */

971

if(debug){

972

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

973

mc->dh_bits);

974

}

975

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

976

if(ret != GNUTLS_E_SUCCESS){

977

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

978

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

979

safer_gnutls_strerror(ret));

980

goto globalfail;

981

}

982

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

983

}

984

}

542

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

543

if(ret != GNUTLS_E_SUCCESS){

544

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

545

safer_gnutls_strerror(ret));

546

goto globalfail;

547

}

548

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

985

550

986

551

return 0;

987

552

988

553

globalfail:

989

554

990

gnutls_certificate_free_credentials(mc->cred);

991

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

992

558

return -1;

993

559

}

994

560

995

__attribute__((nonnull, warn_unused_result))

996

static int init_gnutls_session(gnutls_session_t *session,

997

mandos_context *mc){

561

static int init_gnutls_session(gnutls_session_t *session){

998

562

int ret;

999

563

/* GnuTLS session creation */

1000

564

do {

1001

ret = gnutls_init(session, (GNUTLS_SERVER

1002

#if GNUTLS_VERSION_NUMBER >= 0x030506

1003

| GNUTLS_NO_TICKETS

1004

#endif

1005

#if GNUTLS_VERSION_NUMBER >= 0x030606

1006

| GNUTLS_ENABLE_RAWPK

1007

#endif

1008

));

565

ret = gnutls_init(session, GNUTLS_SERVER);

1009

566

if(quit_now){

1010

567

return -1;

1011

568

}

1019

576

{

1020

577

const char *err;

1021

578

do {

1022

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

579

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

1023

580

if(quit_now){

1024

581

gnutls_deinit(*session);

1025

582

return -1;

1036

593

1037

594

do {

1038

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

1039

mc->cred);

596

mc.cred);

1040

597

if(quit_now){

1041

598

gnutls_deinit(*session);

1042

599

return -1;

1052

609

/* ignore client certificate if any. */

1053

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

1054

611

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

613

1055

614

return 0;

1056

615

}

1057

616

1059

618

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

1060

619

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

1061

620

1062

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

1063

__attribute__((nonnull, warn_unused_result))

1064

static bool add_delete_local_route(const bool add,

1065

const char *address,

1066

AvahiIfIndex if_index){

1067

int ret;

1068

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

1069

char add_arg[] = "add";

1070

char delete_arg[] = "delete";

1071

char debug_flag[] = "--debug";

1072

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

1073

if(pluginhelperdir == NULL){

1074

if(debug){

1075

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

1076

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

1077

}

1078

return false;

1079

}

1080

1081

char interface[IF_NAMESIZE];

1082

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

1083

perror_plus("if_indextoname");

1084

return false;

1085

}

1086

1087

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

1088

if(devnull == -1){

1089

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

1090

return false;

1091

}

1092

pid_t pid = fork();

1093

if(pid == 0){

1094

/* Child */

1095

/* Raise privileges */

1096

errno = raise_privileges_permanently();

1097

if(errno != 0){

1098

perror_plus("Failed to raise privileges");

1099

/* _exit(EX_NOPERM); */

1100

} else {

1101

/* Set group */

1102

errno = 0;

1103

ret = setgid(0);

1104

if(ret == -1){

1105

perror_plus("setgid");

1106

close(devnull);

1107

_exit(EX_NOPERM);

1108

}

1109

/* Reset supplementary groups */

1110

errno = 0;

1111

ret = setgroups(0, NULL);

1112

if(ret == -1){

1113

perror_plus("setgroups");

1114

close(devnull);

1115

_exit(EX_NOPERM);

1116

}

1117

}

1118

ret = dup2(devnull, STDIN_FILENO);

1119

if(ret == -1){

1120

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

1121

close(devnull);

1122

_exit(EX_OSERR);

1123

}

1124

ret = close(devnull);

1125

if(ret == -1){

1126

perror_plus("close");

1127

}

1128

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1129

if(ret == -1){

1130

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

1131

_exit(EX_OSERR);

1132

}

1133

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

1134

O_RDONLY

1135

| O_DIRECTORY

1136

| O_PATH

1137

| O_CLOEXEC));

1138

if(helperdir_fd == -1){

1139

perror_plus("open");

1140

_exit(EX_UNAVAILABLE);

1141

}

1142

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

1143

helper, O_RDONLY));

1144

if(helper_fd == -1){

1145

perror_plus("openat");

1146

close(helperdir_fd);

1147

_exit(EX_UNAVAILABLE);

1148

}

1149

close(helperdir_fd);

1150

#ifdef __GNUC__

1151

#pragma GCC diagnostic push

1152

#pragma GCC diagnostic ignored "-Wcast-qual"

1153

#endif

1154

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

1155

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

1156

interface, debug ? debug_flag : NULL, NULL },

1157

environ) == -1){

1158

#ifdef __GNUC__

1159

#pragma GCC diagnostic pop

1160

#endif

1161

perror_plus("fexecve");

1162

_exit(EXIT_FAILURE);

1163

}

1164

}

1165

if(pid == -1){

1166

perror_plus("fork");

1167

close(devnull);

1168

return false;

1169

}

1170

ret = close(devnull);

1171

if(ret == -1){

1172

perror_plus("close");

1173

}

1174

int status;

1175

pid_t pret = -1;

1176

errno = 0;

1177

do {

1178

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

1179

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

1180

int errno_raising = 0;

1181

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

1182

errno_raising = errno;

1183

perror_plus("Failed to raise privileges in order to"

1184

" kill helper program");

1185

}

1186

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

1187

perror_plus("kill");

1188

}

1189

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

1190

perror_plus("Failed to lower privileges after killing"

1191

" helper program");

1192

}

1193

return false;

1194

}

1195

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

1196

if(pret == -1){

1197

perror_plus("waitpid");

1198

return false;

1199

}

1200

if(WIFEXITED(status)){

1201

if(WEXITSTATUS(status) != 0){

1202

fprintf_plus(stderr, "Error: iprouteadddel exited"

1203

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

1204

return false;

1205

}

1206

return true;

1207

}

1208

if(WIFSIGNALED(status)){

1209

fprintf_plus(stderr, "Error: iprouteadddel died by"

1210

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

1211

return false;

1212

}

1213

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

1214

return false;

1215

}

1216

1217

__attribute__((nonnull, warn_unused_result))

1218

static bool add_local_route(const char *address,

1219

AvahiIfIndex if_index){

1220

if(debug){

1221

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

1222

}

1223

return add_delete_local_route(true, address, if_index);

1224

}

1225

1226

__attribute__((nonnull, warn_unused_result))

1227

static bool delete_local_route(const char *address,

1228

AvahiIfIndex if_index){

1229

if(debug){

1230

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

1231

}

1232

return add_delete_local_route(false, address, if_index);

1233

}

1234

1235

621

/* Called when a Mandos server is found */

1236

__attribute__((nonnull, warn_unused_result))

1237

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

622

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

1238

623

AvahiIfIndex if_index,

1239

int af, mandos_context *mc){

624

int af){

1240

625

int ret, tcp_sd = -1;

1241

626

ssize_t sret;

1242

struct sockaddr_storage to;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

1243

631

char *buffer = NULL;

1244

632

char *decrypted_buffer = NULL;

1245

633

size_t buffer_length = 0;

1248

636

int retval = -1;

1249

637

gnutls_session_t session;

1250

638

int pf; /* Protocol family */

1251

bool route_added = false;

1252

639

1253

640

errno = 0;

1254

641

1270

657

return -1;

1271

658

}

1272

659

1273

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

1274

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

1275

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

1276

bool match = false;

1277

{

1278

char *interface = NULL;

1279

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

1280

mc->interfaces_size,

1281

interface))){

1282

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

1283

match = true;

1284

break;

1285

}

1286

}

1287

}

1288

if(not match){

1289

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

1290

connect to the server */

1291

if(debug){

1292

char interface[IF_NAMESIZE];

1293

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

1294

perror_plus("if_indextoname");

1295

} else {

1296

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

1297

" \"%s\"\n",

1298

if_indextoname((unsigned int)if_index,

1299

interface));

1300

}

1301

}

1302

return -1;

1303

}

1304

}

1305

1306

ret = init_gnutls_session(&session, mc);

660

ret = init_gnutls_session(&session);

1307

661

if(ret != 0){

1308

662

return -1;

1309

663

}

1310

664

1311

665

if(debug){

1312

666

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

1313

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

667

PRIu16 "\n", ip, port);

1314

668

}

1315

669

1316

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

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

1317

671

if(tcp_sd < 0){

1318

672

int e = errno;

1319

673

perror_plus("socket");

1326

680

goto mandos_end;

1327

681

}

1328

682

683

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

1329

684

if(af == AF_INET6){

1330

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

1331

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

1332

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

685

to.in6.sin6_family = (sa_family_t)af;

686

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

1333

687

} else { /* IPv4 */

1334

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

1335

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

1336

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

688

to.in.sin_family = (sa_family_t)af;

689

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

1337

690

}

1338

691

if(ret < 0 ){

1339

692

int e = errno;

1348

701

goto mandos_end;

1349

702

}

1350

703

if(af == AF_INET6){

1351

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

1352

if(IN6_IS_ADDR_LINKLOCAL

1353

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

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

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

710

-Wunreachable-code*/

1354

711

if(if_index == AVAHI_IF_UNSPEC){

1355

712

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

1356

713

" incomplete without a network interface\n");

1358

715

goto mandos_end;

1359

716

}

1360

717

/* Set the network interface number as scope */

1361

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

718

to.in6.sin6_scope_id = (uint32_t)if_index;

1362

719

}

1363

720

} else {

1364

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

721

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

722

-Wconversion and

723

-Wunreachable-code */

1365

724

}

1366

725

1367

726

if(quit_now){

1375

734

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

1376

735

perror_plus("if_indextoname");

1377

736

} else {

1378

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

1379

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

737

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

738

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

1380

739

}

1381

740

} else {

1382

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

1383

ip, (uintmax_t)port);

741

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

742

ip, port);

1384

743

}

1385

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1386

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1387

if(af == AF_INET6){

1388

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

1389

sizeof(struct sockaddr_in6),

1390

addrstr, sizeof(addrstr), NULL, 0,

1391

NI_NUMERICHOST);

1392

} else {

1393

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

1394

sizeof(struct sockaddr_in),

1395

addrstr, sizeof(addrstr), NULL, 0,

1396

NI_NUMERICHOST);

1397

}

1398

if(ret == EAI_SYSTEM){

1399

perror_plus("getnameinfo");

1400

} else if(ret != 0) {

1401

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

1402

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

1403

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

1404

}

1405

}

1406

1407

if(quit_now){

1408

errno = EINTR;

1409

goto mandos_end;

1410

}

1411

1412

while(true){

1413

if(af == AF_INET6){

1414

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

1415

sizeof(struct sockaddr_in6));

1416

} else {

1417

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

1418

sizeof(struct sockaddr_in));

1419

}

1420

if(ret < 0){

1421

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

1422

and if_index != AVAHI_IF_UNSPEC

1423

and connect_to == NULL

1424

and not route_added and

1425

((af == AF_INET6 and not

1426

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1427

&to)->sin6_addr)))

1428

or (af == AF_INET and

1429

/* Not a a IPv4LL address */

1430

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

1431

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

1432

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

1433

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

1434

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

1435

connect to a Mandos server announced by Avahi on a server

1436

host with a global address. Work around this by retrying

1437

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

1438

1439

Avahi bug reference:

1440

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

1441

https://bugs.debian.org/587961

1442

*/

1443

if(debug){

1444

fprintf_plus(stderr, "Mandos server unreachable, trying"

1445

" direct route\n");

1446

}

1447

int e = errno;

1448

route_added = add_local_route(ip, if_index);

1449

if(route_added){

1450

continue;

1451

}

1452

errno = e;

1453

}

1454

if(errno != ECONNREFUSED or debug){

1455

int e = errno;

1456

perror_plus("connect");

1457

errno = e;

1458

}

1459

goto mandos_end;

1460

}

1461

1462

if(quit_now){

1463

errno = EINTR;

1464

goto mandos_end;

1465

}

1466

break;

746

const char *pcret;

747

if(af == AF_INET6){

748

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

749

sizeof(addrstr));

750

} else {

751

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

752

sizeof(addrstr));

753

}

754

if(pcret == NULL){

755

perror_plus("inet_ntop");

756

} else {

757

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

758

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

759

}

760

}

761

}

762

763

if(quit_now){

764

errno = EINTR;

765

goto mandos_end;

766

}

767

768

if(af == AF_INET6){

769

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

770

} else {

771

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

772

}

773

if(ret < 0){

774

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

775

int e = errno;

776

perror_plus("connect");

777

errno = e;

778

}

779

goto mandos_end;

780

}

781

782

if(quit_now){

783

errno = EINTR;

784

goto mandos_end;

1467

785

}

1468

786

1469

787

const char *out = mandos_protocol_version;

1620

938

if(buffer_length > 0){

1621

939

ssize_t decrypted_buffer_size;

1622

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1623

&decrypted_buffer, mc);

941

&decrypted_buffer);

1624

942

if(decrypted_buffer_size >= 0){

1625

943

1626

clearerr(stdout);

1627

944

written = 0;

1628

945

while(written < (size_t) decrypted_buffer_size){

1629

946

if(quit_now){

1645

962

}

1646

963

written += (size_t)ret;

1647

964

}

1648

ret = fflush(stdout);

1649

if(ret != 0){

1650

int e = errno;

1651

if(debug){

1652

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

1653

strerror(errno));

1654

}

1655

errno = e;

1656

goto mandos_end;

1657

}

1658

965

retval = 0;

1659

966

}

1660

967

}

1663

970

1664

971

mandos_end:

1665

972

{

1666

if(route_added){

1667

if(not delete_local_route(ip, if_index)){

1668

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

1669

" interface %d", ip, if_index);

1670

}

1671

}

1672

973

int e = errno;

1673

974

free(decrypted_buffer);

1674

975

free(buffer);

1675

976

if(tcp_sd >= 0){

1676

ret = close(tcp_sd);

977

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

1677

978

}

1678

979

if(ret == -1){

1679

980

if(e == 0){

1704

1005

AVAHI_GCC_UNUSED AvahiStringList *txt,

1705

1006

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1706

1007

flags,

1707

void *mc){

1708

if(r == NULL){

1709

return;

1710

}

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1711

1010

1712

1011

/* Called whenever a service has been resolved successfully or

1713

1012

timed out */

1714

1013

1715

1014

if(quit_now){

1716

avahi_s_service_resolver_free(r);

1717

1015

return;

1718

1016

}

1719

1017

1723

1021

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

1724

1022

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

1725

1023

domain,

1726

avahi_strerror(avahi_server_errno

1727

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

1024

avahi_strerror(avahi_server_errno(mc.server)));

1728

1025

break;

1729

1026

1730

1027

case AVAHI_RESOLVER_FOUND:

1736

1033

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

1737

1034

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

1738

1035

}

1739

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

1740

interface,

1741

avahi_proto_to_af(proto),

1742

mc);

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1743

1038

if(ret == 0){

1744

avahi_simple_poll_quit(simple_poll);

1039

avahi_simple_poll_quit(mc.simple_poll);

1745

1040

} else {

1746

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

1747

avahi_proto_to_af(proto),

1748

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

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1749

1043

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

1750

1044

" list\n", name);

1751

1045

}

1764

1058

const char *domain,

1765

1059

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1766

1060

flags,

1767

void *mc){

1768

if(b == NULL){

1769

return;

1770

}

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1771

1063

1772

1064

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

1773

1065

is removed from the LAN */

1781

1073

case AVAHI_BROWSER_FAILURE:

1782

1074

1783

1075

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

1784

avahi_strerror(avahi_server_errno

1785

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

1786

avahi_simple_poll_quit(simple_poll);

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1787

1078

return;

1788

1079

1789

1080

case AVAHI_BROWSER_NEW:

1792

1083

the callback function is called the Avahi server will free the

1793

1084

resolver for us. */

1794

1085

1795

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

1796

interface, protocol, name, type,

1797

domain, protocol, 0,

1798

resolve_callback, mc) == NULL)

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1799

1089

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

1800

1090

" %s\n", name,

1801

avahi_strerror(avahi_server_errno

1802

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

1091

avahi_strerror(avahi_server_errno(mc.server)));

1803

1092

break;

1804

1093

1805

1094

case AVAHI_BROWSER_REMOVE:

1824

1113

signal_received = sig;

1825

1114

int old_errno = errno;

1826

1115

/* set main loop to exit */

1827

if(simple_poll != NULL){

1828

avahi_simple_poll_quit(simple_poll);

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1829

1118

}

1830

1119

errno = old_errno;

1831

1120

}

1832

1121

1833

__attribute__((nonnull, warn_unused_result))

1834

1122

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

1835

1123

int ret;

1836

int old_errno;

1837

1124

1838

1125

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

1839

1126

if(s < 0){

1840

old_errno = errno;

1841

1127

perror_plus("socket");

1842

errno = old_errno;

1843

1128

return false;

1844

1129

}

1845

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

1846

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

1130

strcpy(ifr->ifr_name, ifname);

1847

1131

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1848

1132

if(ret == -1){

1849

1133

if(debug){

1850

old_errno = errno;

1851

1134

perror_plus("ioctl SIOCGIFFLAGS");

1852

errno = old_errno;

1853

}

1854

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

1855

old_errno = errno;

1856

perror_plus("close");

1857

errno = old_errno;

1858

1135

}

1859

1136

return false;

1860

1137

}

1861

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

1862

old_errno = errno;

1863

perror_plus("close");

1864

errno = old_errno;

1865

}

1866

1138

return true;

1867

1139

}

1868

1140

1869

__attribute__((nonnull, warn_unused_result))

1870

1141

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

1871

1142

1872

1143

/* Reject the loopback device */

1914

1185

* corresponds to an acceptable network device.

1915

1186

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

1916

1187

*/

1917

__attribute__((nonnull, warn_unused_result))

1918

1188

int good_interface(const struct dirent *if_entry){

1919

1189

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

1920

1190

return 0;

1936

1206

}

1937

1207

1938

1208

/*

1939

* This function determines if a network interface is up.

1940

*/

1941

__attribute__((nonnull, warn_unused_result))

1942

bool interface_is_up(const char *interface){

1943

struct ifreq ifr;

1944

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

1945

if(debug){

1946

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

1947

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

1948

}

1949

return false;

1950

}

1951

1952

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

1953

}

1954

1955

/*

1956

* This function determines if a network interface is running

1957

*/

1958

__attribute__((nonnull, warn_unused_result))

1959

bool interface_is_running(const char *interface){

1960

struct ifreq ifr;

1961

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

1962

if(debug){

1963

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

1964

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

1965

}

1966

return false;

1967

}

1968

1969

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

1970

}

1971

1972

__attribute__((nonnull, pure, warn_unused_result))

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

if(not (ifr.ifr_flags & IFF_UP)){

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

if(not (ifr.ifr_flags & IFF_RUNNING)){

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1973

1251

int notdotentries(const struct dirent *direntry){

1974

1252

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

1975

1253

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

1982

1260

}

1983

1261

1984

1262

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

1985

__attribute__((nonnull, warn_unused_result))

1986

1263

int runnable_hook(const struct dirent *direntry){

1987

1264

int ret;

1988

1265

size_t sret;

1996

1273

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

1997

1274

"abcdefghijklmnopqrstuvwxyz"

1998

1275

"0123456789"

1999

"_.-");

1276

"_-");

2000

1277

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

2001

1278

/* Contains non-allowed characters */

2002

1279

if(debug){

2006

1283

return 0;

2007

1284

}

2008

1285

2009

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

1286

char *fullname = NULL;

1287

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1288

if(ret < 0){

1289

perror_plus("asprintf");

1290

return 0;

1291

}

1292

1293

ret = stat(fullname, &st);

2010

1294

if(ret == -1){

2011

1295

if(debug){

2012

1296

perror_plus("Could not stat hook");

2036

1320

return 1;

2037

1321

}

2038

1322

2039

__attribute__((nonnull, warn_unused_result))

2040

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

2041

mandos_context *mc){

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

2042

1324

int ret;

2043

1325

struct timespec now;

2044

1326

struct timespec waited_time;

2045

1327

intmax_t block_time;

2046

1328

2047

1329

while(true){

2048

if(mc->current_server == NULL){

2049

if(debug){

1330

if(mc.current_server == NULL){

1331

if (debug){

2050

1332

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

2051

1333

" No timeout!\n");

2052

1334

}

2053

1335

ret = avahi_simple_poll_iterate(s, -1);

2054

1336

} else {

2055

if(debug){

1337

if (debug){

2056

1338

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

2057

1339

" it, or wait\n");

2058

1340

}

2065

1347

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

2066

1348

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

2067

1349

waited_time.tv_sec = (now.tv_sec

2068

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

1350

- mc.current_server->last_seen.tv_sec);

2069

1351

waited_time.tv_nsec = (now.tv_nsec

2070

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

1352

- mc.current_server->last_seen.tv_nsec);

2071

1353

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

2072

1354

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

2073

1355

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

2075

1357

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

2076

1358

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

2077

1359

2078

if(debug){

1360

if (debug){

2079

1361

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

2080

1362

block_time);

2081

1363

}

2082

1364

2083

1365

if(block_time <= 0){

2084

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

2085

mc->current_server->port,

2086

mc->current_server->if_index,

2087

mc->current_server->af, mc);

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

2088

1370

if(ret == 0){

2089

avahi_simple_poll_quit(s);

1371

avahi_simple_poll_quit(mc.simple_poll);

2090

1372

return 0;

2091

1373

}

2092

1374

ret = clock_gettime(CLOCK_MONOTONIC,

2093

&mc->current_server->last_seen);

1375

&mc.current_server->last_seen);

2094

1376

if(ret == -1){

2095

1377

perror_plus("clock_gettime");

2096

1378

return -1;

2097

1379

}

2098

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

1380

mc.current_server = mc.current_server->next;

2099

1381

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

2100

1382

servers, but don't block */

2101

1383

}

2103

1385

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

2104

1386

}

2105

1387

if(ret != 0){

2106

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

1388

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

2107

1389

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

2108

1390

}

2109

1391

}

2110

1392

}

2111

1393

}

2112

1394

2113

__attribute__((nonnull))

2114

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

1395

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1400

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

1401

perror_plus("seteuid");

1402

}

1403

ret_errno = errno;

1404

errno = old_errno;

1405

return ret_errno;

1406

}

1407

1408

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1412

if(ret_errno != 0){

1413

errno = old_errno;

1414

return ret_errno;

1415

}

1416

errno = 0;

1417

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

1418

perror_plus("seteuid");

1419

}

1420

ret_errno = errno;

1421

errno = old_errno;

1422

return ret_errno;

1423

}

1424

1425

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1430

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

1431

perror_plus("seteuid");

1432

}

1433

ret_errno = errno;

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

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

2115

1439

const float delay){

2116

struct dirent **direntries = NULL;

2117

if(hookdir_fd == -1){

2118

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2119

| O_CLOEXEC);

2120

if(hookdir_fd == -1){

2121

if(errno == ENOENT){

2122

if(debug){

2123

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

2124

" found\n", hookdir);

2125

}

2126

} else {

2127

perror_plus("open");

2128

}

2129

return;

2130

}

2131

}

2132

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

2133

if(devnull == -1){

2134

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

2135

return;

2136

}

2137

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

2138

runnable_hook, alphasort);

1440

struct dirent **direntries;

1441

struct dirent *direntry;

1442

int ret;

1443

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1444

alphasort);

2139

1445

if(numhooks == -1){

2140

1446

perror_plus("scandir");

2141

close(devnull);

2142

return;

2143

}

2144

struct dirent *direntry;

2145

int ret;

2146

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

2147

direntry = direntries[i];

2148

if(debug){

2149

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

2150

direntry->d_name);

2151

}

2152

pid_t hook_pid = fork();

2153

if(hook_pid == 0){

2154

/* Child */

2155

/* Raise privileges */

2156

errno = raise_privileges_permanently();

2157

if(errno != 0){

2158

perror_plus("Failed to raise privileges");

2159

_exit(EX_NOPERM);

2160

}

2161

/* Set group */

2162

errno = 0;

2163

ret = setgid(0);

2164

if(ret == -1){

2165

perror_plus("setgid");

2166

_exit(EX_NOPERM);

2167

}

2168

/* Reset supplementary groups */

2169

errno = 0;

2170

ret = setgroups(0, NULL);

2171

if(ret == -1){

2172

perror_plus("setgroups");

2173

_exit(EX_NOPERM);

2174

}

2175

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

2176

if(ret == -1){

2177

perror_plus("setenv");

2178

_exit(EX_OSERR);

2179

}

2180

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

2181

if(ret == -1){

2182

perror_plus("setenv");

2183

_exit(EX_OSERR);

2184

}

2185

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

2186

if(ret == -1){

2187

perror_plus("setenv");

2188

_exit(EX_OSERR);

2189

}

2190

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

2191

if(ret == -1){

2192

perror_plus("setenv");

2193

_exit(EX_OSERR);

2194

}

2195

char *delaystring;

2196

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

2197

if(ret == -1){

1447

} else {

1448

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

1449

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

1450

direntry = direntries[i];

1451

char *fullname = NULL;

1452

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1453

if(ret < 0){

2198

1454

perror_plus("asprintf");

2199

_exit(EX_OSERR);

2200

}

2201

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

2202

if(ret == -1){

1455

continue;

1456

}

1457

if(debug){

1458

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

1459

direntry->d_name);

1460

}

1461

pid_t hook_pid = fork();

1462

if(hook_pid == 0){

1463

/* Child */

1464

/* Raise privileges */

1465

raise_privileges_permanently();

1466

/* Set group */

1467

errno = 0;

1468

ret = setgid(0);

1469

if(ret == -1){

1470

perror_plus("setgid");

1471

}

1472

/* Reset supplementary groups */

1473

errno = 0;

1474

ret = setgroups(0, NULL);

1475

if(ret == -1){

1476

perror_plus("setgroups");

1477

}

1478

dup2(devnull, STDIN_FILENO);

1479

close(devnull);

1480

dup2(STDERR_FILENO, STDOUT_FILENO);

1481

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

1482

if(ret == -1){

1483

perror_plus("setenv");

1484

_exit(EX_OSERR);

1485

}

1486

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

1487

if(ret == -1){

1488

perror_plus("setenv");

1489

_exit(EX_OSERR);

1490

}

1491

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

1492

if(ret == -1){

1493

perror_plus("setenv");

1494

_exit(EX_OSERR);

1495

}

1496

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

1497

if(ret == -1){

1498

perror_plus("setenv");

1499

_exit(EX_OSERR);

1500

}

1501

char *delaystring;

1502

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

1503

if(ret == -1){

1504

perror_plus("asprintf");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

free(delaystring);

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

2203

1513

free(delaystring);

2204

perror_plus("setenv");

2205

_exit(EX_OSERR);

2206

}

2207

free(delaystring);

2208

if(connect_to != NULL){

2209

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

2210

if(ret == -1){

2211

perror_plus("setenv");

2212

_exit(EX_OSERR);

2213

}

2214

}

2215

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

2216

direntry->d_name,

2217

O_RDONLY));

2218

if(hook_fd == -1){

2219

perror_plus("openat");

2220

_exit(EXIT_FAILURE);

2221

}

2222

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

2223

perror_plus("close");

2224

_exit(EXIT_FAILURE);

2225

}

2226

ret = dup2(devnull, STDIN_FILENO);

2227

if(ret == -1){

2228

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

2229

_exit(EX_OSERR);

2230

}

2231

ret = close(devnull);

2232

if(ret == -1){

2233

perror_plus("close");

2234

_exit(EX_OSERR);

2235

}

2236

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2237

if(ret == -1){

2238

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

2239

_exit(EX_OSERR);

2240

}

2241

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

2242

environ) == -1){

2243

perror_plus("fexecve");

2244

_exit(EXIT_FAILURE);

2245

}

2246

} else {

2247

if(hook_pid == -1){

2248

perror_plus("fork");

2249

free(direntry);

2250

continue;

2251

}

2252

int status;

2253

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

2254

perror_plus("waitpid");

2255

free(direntry);

2256

continue;

2257

}

2258

if(WIFEXITED(status)){

2259

if(WEXITSTATUS(status) != 0){

2260

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

2261

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

2262

WEXITSTATUS(status));

2263

free(direntry);

2264

continue;

2265

}

2266

} else if(WIFSIGNALED(status)){

2267

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

2268

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

2269

WTERMSIG(status));

2270

free(direntry);

2271

continue;

1514

if(connect_to != NULL){

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

}

1521

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1522

perror_plus("execl");

1523

_exit(EXIT_FAILURE);

1524

}

2272

1525

} else {

2273

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

2274

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

2275

free(direntry);

2276

continue;

2277

}

2278

}

2279

if(debug){

2280

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

2281

direntry->d_name);

2282

}

2283

free(direntry);

2284

}

2285

free(direntries);

2286

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

2287

perror_plus("close");

2288

} else {

2289

hookdir_fd = -1;

2290

}

2291

close(devnull);

1526

int status;

1527

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

1528

perror_plus("waitpid");

1529

free(fullname);

1530

continue;

1531

}

1532

if(WIFEXITED(status)){

1533

if(WEXITSTATUS(status) != 0){

1534

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

1535

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

1536

WEXITSTATUS(status));

1537

free(fullname);

1538

continue;

1539

}

1540

} else if(WIFSIGNALED(status)){

1541

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

1542

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

1543

WTERMSIG(status));

1544

free(fullname);

1545

continue;

1546

} else {

1547

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

1548

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

1549

free(fullname);

1550

continue;

1551

}

1552

}

1553

free(fullname);

1554

if(debug){

1555

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

1556

direntry->d_name);

1557

}

1558

}

1559

close(devnull);

1560

}

1561

return true;

2292

1562

}

2293

1563

2294

__attribute__((nonnull, warn_unused_result))

2295

int bring_up_interface(const char *const interface,

2296

const float delay){

1564

int bring_up_interface(const char * const interface, const float delay){

1565

int sd = -1;

2297

1566

int old_errno = errno;

1567

int ret_errno = 0;

2298

1568

int ret;

2299

1569

struct ifreq network;

2300

unsigned int if_index = if_nametoindex(interface);

1570

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

2301

1571

if(if_index == 0){

2302

1572

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

2303

1573

errno = old_errno;

2309

1579

return EINTR;

2310

1580

}

2311

1581

2312

if(not interface_is_up(interface)){

2313

int ret_errno = 0;

2314

int ioctl_errno = 0;

2315

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

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 |= IFF_UP; /* set 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(quit_now){

2333

ret = close(sd);

2334

if(ret == -1){

2335

perror_plus("close");

2336

}

2337

errno = old_errno;

2338

return EINTR;

2339

}

2340

2341

if(debug){

2342

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

2343

interface);

2344

}

2345

2346

/* Raise privileges */

2347

ret_errno = raise_privileges();

2348

if(ret_errno != 0){

2349

errno = ret_errno;

2350

perror_plus("Failed to raise privileges");

2351

}

2352

2353

#ifdef __linux__

2354

int ret_linux;

2355

bool restore_loglevel = false;

2356

if(ret_errno == 0){

2357

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2358

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

2359

ret_linux = klogctl(8, NULL, 5);

2360

if(ret_linux == -1){

2361

perror_plus("klogctl");

2362

} else {

2363

restore_loglevel = true;

2364

}

2365

}

2366

#endif /* __linux__ */

2367

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

2368

ioctl_errno = errno;

2369

#ifdef __linux__

2370

if(restore_loglevel){

2371

ret_linux = klogctl(7, NULL, 0);

2372

if(ret_linux == -1){

2373

perror_plus("klogctl");

2374

}

2375

}

2376

#endif /* __linux__ */

2377

2378

/* If raise_privileges() succeeded above */

2379

if(ret_errno == 0){

2380

/* Lower privileges */

2381

ret_errno = lower_privileges();

2382

if(ret_errno != 0){

2383

errno = ret_errno;

2384

perror_plus("Failed to lower privileges");

2385

}

2386

}

2387

2388

/* Close the socket */

2389

ret = close(sd);

1582

/* Re-raise priviliges */

1583

raise_privileges();

1584

1585

#ifdef __linux__

1586

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1587

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

1588

ret = klogctl(8, NULL, 5);

1589

bool restore_loglevel = true;

1590

if(ret == -1){

1591

restore_loglevel = false;

1592

perror_plus("klogctl");

1593

}

1594

#endif /* __linux__ */

1595

1596

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1597

if(sd < 0){

1598

ret_errno = errno;

1599

perror_plus("socket");

1600

#ifdef __linux__

1601

if(restore_loglevel){

1602

ret = klogctl(7, NULL, 0);

1603

if(ret == -1){

1604

perror_plus("klogctl");

1605

}

1606

}

1607

#endif /* __linux__ */

1608

/* Lower privileges */

1609

lower_privileges();

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

ret_errno = errno;

1617

perror_plus("ioctl SIOCGIFFLAGS");

1618

#ifdef __linux__

1619

if(restore_loglevel){

1620

ret = klogctl(7, NULL, 0);

1621

if(ret == -1){

1622

perror_plus("klogctl");

1623

}

1624

}

1625

#endif /* __linux__ */

1626

/* Lower privileges */

1627

lower_privileges();

1628

errno = old_errno;

1629

return ret_errno;

1630

}

1631

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

1632

network.ifr_flags |= IFF_UP;

1633

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

2390

1634

if(ret == -1){

2391

perror_plus("close");

2392

}

2393

2394

if(ret_setflags == -1){

2395

errno = ioctl_errno;

1635

ret_errno = errno;

2396

1636

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1637

#ifdef __linux__

1638

if(restore_loglevel){

1639

ret = klogctl(7, NULL, 0);

1640

if(ret == -1){

1641

perror_plus("klogctl");

1642

}

1643

}

1644

#endif /* __linux__ */

1645

/* Lower privileges */

1646

lower_privileges();

2397

1647

errno = old_errno;

2398

return ioctl_errno;

1648

return ret_errno;

2399

1649

}

2400

} else if(debug){

2401

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

2402

interface);

2403

1650

}

2404

2405

1651

/* Sleep checking until interface is running.

2406

1652

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

2407

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

2408

if(interface_is_running(interface)){

1653

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

1654

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

1655

if(ret == -1){

1656

perror_plus("ioctl SIOCGIFFLAGS");

1657

} else if(network.ifr_flags & IFF_RUNNING){

2409

1658

break;

2410

1659

}

2411

1660

struct timespec sleeptime = { .tv_nsec = 250000000 };

2414

1663

perror_plus("nanosleep");

2415

1664

}

2416

1665

}

2417

2418

errno = old_errno;

2419

return 0;

2420

}

2421

2422

__attribute__((nonnull, warn_unused_result))

2423

int take_down_interface(const char *const interface){

2424

int old_errno = errno;

2425

struct ifreq network;

2426

unsigned int if_index = if_nametoindex(interface);

2427

if(if_index == 0){

2428

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

2429

errno = old_errno;

2430

return ENXIO;

1666

/* Close the socket */

1667

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

1668

if(ret == -1){

1669

perror_plus("close");

2431

1670

}

2432

if(interface_is_up(interface)){

2433

int ret_errno = 0;

2434

int ioctl_errno = 0;

2435

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

2436

ret_errno = errno;

2437

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

2438

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

2439

errno = old_errno;

2440

return ret_errno;

2441

}

2442

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

2443

2444

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

2445

if(sd == -1){

2446

ret_errno = errno;

2447

perror_plus("socket");

2448

errno = old_errno;

2449

return ret_errno;

2450

}

2451

2452

if(debug){

2453

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

2454

interface);

2455

}

2456

2457

/* Raise privileges */

2458

ret_errno = raise_privileges();

2459

if(ret_errno != 0){

2460

errno = ret_errno;

2461

perror_plus("Failed to raise privileges");

2462

}

2463

2464

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

2465

ioctl_errno = errno;

2466

2467

/* If raise_privileges() succeeded above */

2468

if(ret_errno == 0){

2469

/* Lower privileges */

2470

ret_errno = lower_privileges();

2471

if(ret_errno != 0){

2472

errno = ret_errno;

2473

perror_plus("Failed to lower privileges");

2474

}

2475

}

2476

2477

/* Close the socket */

2478

int ret = close(sd);

1671

#ifdef __linux__

1672

if(restore_loglevel){

1673

/* Restores kernel loglevel to default */

1674

ret = klogctl(7, NULL, 0);

2479

1675

if(ret == -1){

2480

perror_plus("close");

2481

}

2482

2483

if(ret_setflags == -1){

2484

errno = ioctl_errno;

2485

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2486

errno = old_errno;

2487

return ioctl_errno;

2488

}

2489

} else if(debug){

2490

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

2491

interface);

1676

perror_plus("klogctl");

1677

}

2492

1678

}

2493

1679

#endif /* __linux__ */

1680

/* Lower privileges */

1681

lower_privileges();

2494

1682

errno = old_errno;

2495

1683

return 0;

2496

1684

}

2497

1685

2498

1686

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

2499

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

2500

#if GNUTLS_VERSION_NUMBER >= 0x030606

2501

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

2502

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

2503

":%PROFILE_ULTRA",

2504

#elif GNUTLS_VERSION_NUMBER < 0x030600

2505

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

2506

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

2507

#else

2508

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

2509

#endif

2510

.current_server = NULL, .interfaces = NULL,

2511

.interfaces_size = 0 };

2512

1687

AvahiSServiceBrowser *sb = NULL;

2513

error_t ret_errno;

1688

int error;

2514

1689

int ret;

2515

1690

intmax_t tmpmax;

2516

1691

char *tmp;

2517

1692

int exitcode = EXIT_SUCCESS;

2518

char *interfaces_to_take_down = NULL;

2519

size_t interfaces_to_take_down_size = 0;

2520

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

2521

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

2522

char *tempdir = NULL;

1693

const char *interface = "";

1694

struct ifreq network;

1695

int sd = -1;

1696

bool take_down_interface = false;

1697

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

1698

bool tempdir_created = false;

2523

1699

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2524

1700

const char *seckey = PATHDIR "/" SECKEY;

2525

1701

const char *pubkey = PATHDIR "/" PUBKEY;

2526

#if GNUTLS_VERSION_NUMBER >= 0x030606

2527

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2528

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2529

#endif

2530

const char *dh_params_file = NULL;

2531

char *interfaces_hooks = NULL;

2532

1702

2533

1703

bool gnutls_initialized = false;

2534

1704

bool gpgme_initialized = false;

2580

1750

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

2581

1751

.arg = "FILE",

2582

1752

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

2583

.group = 1 },

2584

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

2585

.arg = "FILE",

2586

#if GNUTLS_VERSION_NUMBER >= 0x030606

2587

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

2588

#else

2589

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

2590

#endif

2591

.group = 1 },

2592

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

2593

.arg = "FILE",

2594

#if GNUTLS_VERSION_NUMBER >= 0x030606

2595

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

2596

#else

2597

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

2598

#endif

2599

.group = 1 },

1753

.group = 2 },

2600

1754

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

2601

1755

.arg = "BITS",

2602

1756

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

2603

1757

" Diffie-Hellman key exchange",

2604

1758

.group = 2 },

2605

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

2606

.arg = "FILE",

2607

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

2608

" for the Diffie-Hellman key exchange",

2609

.group = 2 },

2610

1759

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

2611

1760

.arg = "STRING",

2612

1761

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

2646

1795

connect_to = arg;

2647

1796

break;

2648

1797

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

2649

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

2650

arg, (int)',');

2651

if(ret_errno != 0){

2652

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

2653

}

1798

interface = arg;

2654

1799

break;

2655

1800

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

2656

1801

seckey = arg;

2658

1803

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

2659

1804

pubkey = arg;

2660

1805

break;

2661

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

2662

#if GNUTLS_VERSION_NUMBER >= 0x030606

2663

tls_privkey = arg;

2664

#endif

2665

break;

2666

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

2667

#if GNUTLS_VERSION_NUMBER >= 0x030606

2668

tls_pubkey = arg;

2669

#endif

2670

break;

2671

1806

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

2672

1807

errno = 0;

2673

1808

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

2677

1812

}

2678

1813

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

2679

1814

break;

2680

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

2681

dh_params_file = arg;

2682

break;

2683

1815

case 130: /* --priority */

2684

1816

mc.priority = arg;

2685

1817

break;

2708

1840

argp_state_help(state, state->out_stream,

2709

1841

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

2710

1842

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2711

__builtin_unreachable();

2712

1843

case -3: /* --usage */

2713

1844

argp_state_help(state, state->out_stream,

2714

1845

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2715

__builtin_unreachable();

2716

1846

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

2717

1847

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

2718

1848

exit(argp_err_exit_status);

2727

1857

.args_doc = "",

2728

1858

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

2729

1859

" passwords from a Mandos server" };

2730

ret_errno = argp_parse(&argp, argc, argv,

2731

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2732

switch(ret_errno){

1860

ret = argp_parse(&argp, argc, argv,

1861

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1862

switch(ret){

2733

1863

case 0:

2734

1864

break;

2735

1865

case ENOMEM:

2736

1866

default:

2737

errno = ret_errno;

1867

errno = ret;

2738

1868

perror_plus("argp_parse");

2739

1869

exitcode = EX_OSERR;

2740

1870

goto end;

2743

1873

goto end;

2744

1874

}

2745

1875

}

2746

1876

2747

1877

{

2748

/* Re-raise privileges */

2749

ret = raise_privileges();

2750

if(ret != 0){

2751

errno = ret;

2752

perror_plus("Failed to raise privileges");

2753

} else {

1878

/* Work around Debian bug #633582:

1879

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

1880

1881

/* Re-raise priviliges */

1882

if(raise_privileges() == 0){

2754

1883

struct stat st;

2755

1884

2756

/* Work around Debian bug #633582:

2757

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

2758

2759

1885

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

2760

1886

int seckey_fd = open(seckey, O_RDONLY);

2761

1887

if(seckey_fd == -1){

2773

1899

}

2774

1900

}

2775

1901

}

2776

close(seckey_fd);

1902

TEMP_FAILURE_RETRY(close(seckey_fd));

2777

1903

}

2778

1904

}

2779

1905

2780

1906

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

2781

1907

int pubkey_fd = open(pubkey, O_RDONLY);

2782

1908

if(pubkey_fd == -1){

2794

1920

}

2795

1921

}

2796

1922

}

2797

close(pubkey_fd);

2798

}

2799

}

2800

2801

if(dh_params_file != NULL

2802

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

2803

int dhparams_fd = open(dh_params_file, O_RDONLY);

2804

if(dhparams_fd == -1){

2805

perror_plus("open");

2806

} else {

2807

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

2808

if(ret == -1){

2809

perror_plus("fstat");

2810

} else {

2811

if(S_ISREG(st.st_mode)

2812

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

2813

ret = fchown(dhparams_fd, uid, gid);

2814

if(ret == -1){

2815

perror_plus("fchown");

2816

}

2817

}

2818

}

2819

close(dhparams_fd);

2820

}

2821

}

2822

2823

/* Work around Debian bug #981302

2824

<https://bugs.debian.org/981302> */

2825

if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){

2826

ret = symlink("/proc/self/fd", "/dev/fd");

2827

if(ret == -1){

2828

perror_plus("Failed to create /dev/fd symlink");

2829

}

2830

}

2831

1923

TEMP_FAILURE_RETRY(close(pubkey_fd));

1924

}

1925

}

1926

2832

1927

/* Lower privileges */

2833

ret = lower_privileges();

2834

if(ret != 0){

2835

errno = ret;

2836

perror_plus("Failed to lower privileges");

2837

}

2838

}

2839

}

2840

2841

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

2842

{

2843

char *interface = NULL;

2844

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

2845

interface))){

2846

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

2847

and if_nametoindex(interface) == 0){

2848

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

2849

fprintf_plus(stderr, "Not using nonexisting interface"

2850

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

2851

}

2852

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

2853

interface = NULL;

1928

errno = 0;

1929

ret = seteuid(uid);

1930

if(ret == -1){

1931

perror_plus("seteuid");

2854

1932

}

2855

1933

}

2856

1934

}

2857

1935

2858

1936

/* Run network hooks */

2859

{

2860

if(mc.interfaces != NULL){

2861

interfaces_hooks = malloc(mc.interfaces_size);

2862

if(interfaces_hooks == NULL){

1937

if(not run_network_hooks("start", interface, delay)){

1938

goto end;

1939

}

1940

1941

if(not debug){

1942

avahi_set_log_function(empty_log);

1943

}

1944

1945

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

1946

struct dirent **direntries;

1947

/* First look for interfaces that are up */

1948

ret = scandir(sys_class_net, &direntries, up_interface,

1949

alphasort);

1950

if(ret == 0){

1951

/* No up interfaces, look for any good interfaces */

1952

free(direntries);

1953

ret = scandir(sys_class_net, &direntries, good_interface,

1954

alphasort);

1955

}

1956

if(ret >= 1){

1957

/* Pick the first interface returned */

1958

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

1959

if(debug){

1960

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

1961

}

1962

if(interface == NULL){

2863

1963

perror_plus("malloc");

1964

free(direntries);

1965

exitcode = EXIT_FAILURE;

2864

1966

goto end;

2865

1967

}

2866

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

2867

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

1968

free(direntries);

1969

} else {

1970

free(direntries);

1971

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

1972

exitcode = EXIT_FAILURE;

1973

goto end;

2868

1974

}

2869

run_network_hooks("start", interfaces_hooks != NULL ?

2870

interfaces_hooks : "", delay);

2871

}

2872

2873

if(not debug){

2874

avahi_set_log_function(empty_log);

2875

1975

}

2876

1976

2877

1977

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

2878

1978

from the signal handler */

2879

1979

/* Initialize the pseudo-RNG for Avahi */

2880

1980

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

2881

simple_poll = avahi_simple_poll_new();

2882

if(simple_poll == NULL){

1981

mc.simple_poll = avahi_simple_poll_new();

1982

if(mc.simple_poll == NULL){

2883

1983

fprintf_plus(stderr,

2884

1984

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

2885

1985

exitcode = EX_UNAVAILABLE;

2949

2049

}

2950

2050

}

2951

2051

2952

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

2953

if(mc.interfaces == NULL){

2954

struct dirent **direntries = NULL;

2955

/* Look for any good interfaces */

2956

ret = scandir(sys_class_net, &direntries, good_interface,

2957

alphasort);

2958

if(ret >= 1){

2959

/* Add all found interfaces to interfaces list */

2960

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

2961

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

2962

direntries[i]->d_name);

2963

if(ret_errno != 0){

2964

errno = ret_errno;

2965

perror_plus("argz_add");

2966

free(direntries[i]);

2967

continue;

2968

}

2969

if(debug){

2970

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

2971

direntries[i]->d_name);

2972

}

2973

free(direntries[i]);

2974

}

2975

free(direntries);

2976

} else {

2977

if(ret == 0){

2978

free(direntries);

2979

}

2980

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

2981

exitcode = EXIT_FAILURE;

2982

goto end;

2983

}

2984

}

2985

2986

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

2987

{

2988

char *interface = NULL;

2989

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

2990

interface))){

2991

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

2992

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

2993

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

2994

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

2995

interface);

2996

interface = NULL;

2997

while((interface = argz_next(mc.interfaces,

2998

mc.interfaces_size, interface))){

2999

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

3000

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

3001

interface);

3002

interface = NULL;

3003

}

3004

}

3005

break;

3006

}

3007

bool interface_was_up = interface_is_up(interface);

3008

errno = bring_up_interface(interface, delay);

3009

if(not interface_was_up){

3010

if(errno != 0){

3011

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

3012

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

3013

} else {

3014

errno = argz_add(&interfaces_to_take_down,

3015

&interfaces_to_take_down_size,

3016

interface);

3017

if(errno != 0){

3018

perror_plus("argz_add");

3019

}

3020

}

3021

}

3022

}

3023

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

3024

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

3025

}

3026

}

3027

3028

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

3029

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

3030

if(debug){

3031

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

3032

mc.interfaces);

3033

}

3034

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

2052

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

2053

if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){

2054

ret = bring_up_interface(interface, delay);

2055

if(ret != 0){

2056

errno = ret;

2057

perror_plus("Failed to bring up interface");

2058

}

3035

2059

}

3036

2060

3037

2061

if(quit_now){

3038

2062

goto end;

3039

2063

}

3040

2064

3041

#if GNUTLS_VERSION_NUMBER >= 0x030606

3042

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

3043

#elif GNUTLS_VERSION_NUMBER < 0x030600

3044

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

3045

#else

3046

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

3047

#endif

2065

ret = init_gnutls_global(pubkey, seckey);

3048

2066

if(ret == -1){

3049

2067

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

3050

2068

exitcode = EX_UNAVAILABLE;

3057

2075

goto end;

3058

2076

}

3059

2077

3060

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

3061

tempdir = mkdtemp(run_tempdir);

3062

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

3063

if(debug){

3064

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

3065

run_tempdir, old_tempdir);

3066

}

3067

tempdir = mkdtemp(old_tempdir);

3068

}

3069

if(tempdir == NULL){

2078

if(mkdtemp(tempdir) == NULL){

3070

2079

perror_plus("mkdtemp");

3071

2080

goto end;

3072

2081

}

2082

tempdir_created = true;

3073

2083

3074

2084

if(quit_now){

3075

2085

goto end;

3076

2086

}

3077

2087

3078

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

2088

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

3079

2089

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

3080

2090

exitcode = EX_UNAVAILABLE;

3081

2091

goto end;

3102

2112

goto end;

3103

2113

}

3104

2114

3105

in_port_t port;

2115

uint16_t port;

3106

2116

errno = 0;

3107

2117

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

3108

2118

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

3109

or tmpmax != (in_port_t)tmpmax){

2119

or tmpmax != (uint16_t)tmpmax){

3110

2120

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

3111

2121

exitcode = EX_USAGE;

3112

2122

goto end;

3113

2123

}

3114

2124

3115

2125

if(quit_now){

3116

2126

goto end;

3117

2127

}

3118

2128

3119

port = (in_port_t)tmpmax;

2129

port = (uint16_t)tmpmax;

3120

2130

*address = '\0';

3121

2131

/* Colon in address indicates IPv6 */

3122

2132

int af;

3138

2148

}

3139

2149

3140

2150

while(not quit_now){

3141

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

3142

&mc);

2151

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

3143

2152

if(quit_now or ret == 0){

3144

2153

break;

3145

2154

}

3147

2156

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

3148

2157

(int)retry_interval);

3149

2158

}

3150

sleep((unsigned int)retry_interval);

2159

sleep((int)retry_interval);

3151

2160

}

3152

2161

3153

if(not quit_now){

2162

if (not quit_now){

3154

2163

exitcode = EXIT_SUCCESS;

3155

2164

}

3156

2165

3171

2180

config.publish_domain = 0;

3172

2181

3173

2182

/* Allocate a new server */

3174

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3175

&config, NULL, NULL, &ret);

2183

mc.server = avahi_server_new(avahi_simple_poll_get

2184

(mc.simple_poll), &config, NULL,

2185

NULL, &error);

3176

2186

3177

2187

/* Free the Avahi configuration data */

3178

2188

avahi_server_config_free(&config);

3181

2191

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

3182

2192

if(mc.server == NULL){

3183

2193

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

3184

avahi_strerror(ret));

2194

avahi_strerror(error));

3185

2195

exitcode = EX_UNAVAILABLE;

3186

2196

goto end;

3187

2197

}

3193

2203

/* Create the Avahi service browser */

3194

2204

sb = avahi_s_service_browser_new(mc.server, if_index,

3195

2205

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

3196

NULL, 0, browse_callback,

3197

(void *)&mc);

2206

NULL, 0, browse_callback, NULL);

3198

2207

if(sb == NULL){

3199

2208

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

3200

2209

avahi_strerror(avahi_server_errno(mc.server)));

3211

2220

if(debug){

3212

2221

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

3213

2222

}

3214

3215

ret = avahi_loop_with_timeout(simple_poll,

3216

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

2223

2224

ret = avahi_loop_with_timeout(mc.simple_poll,

2225

(int)(retry_interval * 1000));

3217

2226

if(debug){

3218

2227

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

3219

2228

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

3222

2231

end:

3223

2232

3224

2233

if(debug){

3225

if(signal_received){

3226

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

3227

argv[0], signal_received,

3228

strsignal(signal_received));

3229

} else {

3230

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

3231

}

2234

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

3232

2235

}

3233

2236

3234

2237

/* Cleanup things */

3235

free(mc.interfaces);

3236

3237

2238

if(sb != NULL)

3238

2239

avahi_s_service_browser_free(sb);

3239

2240

3240

2241

if(mc.server != NULL)

3241

2242

avahi_server_free(mc.server);

3242

2243

3243

if(simple_poll != NULL)

3244

avahi_simple_poll_free(simple_poll);

2244

if(mc.simple_poll != NULL)

2245

avahi_simple_poll_free(mc.simple_poll);

3245

2246

3246

2247

if(gnutls_initialized){

3247

2248

gnutls_certificate_free_credentials(mc.cred);

2249

gnutls_global_deinit();

3248

2250

gnutls_dh_params_deinit(mc.dh_params);

3249

2251

}

3250

2252

3258

2260

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

3259

2261

while(mc.current_server != NULL){

3260

2262

server *next = mc.current_server->next;

3261

#ifdef __GNUC__

3262

#pragma GCC diagnostic push

3263

#pragma GCC diagnostic ignored "-Wcast-qual"

3264

#endif

3265

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

3266

#ifdef __GNUC__

3267

#pragma GCC diagnostic pop

3268

#endif

3269

2263

free(mc.current_server);

3270

2264

mc.current_server = next;

3271

2265

}

3272

2266

}

3273

2267

3274

/* Re-raise privileges */

2268

/* Run network hooks */

2269

run_network_hooks("stop", interface, delay);

2270

2271

/* Re-raise priviliges */

3275

2272

{

3276

ret = raise_privileges();

3277

if(ret != 0){

3278

errno = ret;

3279

perror_plus("Failed to raise privileges");

3280

} else {

3281

3282

/* Run network hooks */

3283

run_network_hooks("stop", interfaces_hooks != NULL ?

3284

interfaces_hooks : "", delay);

3285

3286

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

3287

{

3288

char *interface = NULL;

3289

while((interface = argz_next(interfaces_to_take_down,

3290

interfaces_to_take_down_size,

3291

interface))){

3292

ret = take_down_interface(interface);

3293

if(ret != 0){

3294

errno = ret;

3295

perror_plus("Failed to take down interface");

3296

}

3297

}

3298

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

3299

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

3300

" down\n");

3301

}

3302

}

3303

}

2273

raise_privileges();

3304

2274

3305

ret = lower_privileges_permanently();

3306

if(ret != 0){

3307

errno = ret;

3308

perror_plus("Failed to lower privileges permanently");

2275

/* Take down the network interface */

2276

if(take_down_interface and geteuid() == 0){

2277

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

2278

if(ret == -1){

2279

perror_plus("ioctl SIOCGIFFLAGS");

2280

} else if(network.ifr_flags & IFF_UP){

2281

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

2282

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

2283

if(ret == -1){

2284

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2285

}

2286

}

2287

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

2288

if(ret == -1){

2289

perror_plus("close");

2290

}

3309

2291

}

3310

2292

}

3311

3312

free(interfaces_to_take_down);

3313

free(interfaces_hooks);

3314

3315

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

3316

uintmax_t level){

2293

/* Lower privileges permanently */

2294

errno = 0;

2295

ret = setuid(uid);

2296

if(ret == -1){

2297

perror_plus("setuid");

2298

}

2299

2300

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

2301

if(tempdir_created){

3317

2302

struct dirent **direntries = NULL;

3318

int dret;

3319

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

3320

O_RDONLY

3321

| O_NOFOLLOW

3322

| O_DIRECTORY

3323

| O_PATH));

3324

if(dir_fd == -1){

3325

perror_plus("open");

3326

return;

3327

}

3328

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

3329

notdotentries, alphasort);

3330

if(numentries >= 0){

2303

struct dirent *direntry = NULL;

2304

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

2305

alphasort);

2306

if (numentries > 0){

3331

2307

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

3332

if(debug){

3333

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

3334

dirname, direntries[i]->d_name);

3335

}

3336

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

3337

if(dret == -1){

3338

if(errno == EISDIR){

3339

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

3340

AT_REMOVEDIR);

3341

}

3342

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

3343

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

3344

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

3345

/* Recurse only in this special case */

3346

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

3347

dret = 0;

3348

}

3349

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

3350

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

3351

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

3352

}

3353

}

3354

free(direntries[i]);

3355

}

3356

3357

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

3358

free(direntries);

3359

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3360

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

3361

perror_plus("rmdir");

3362

}

3363

} else {

3364

perror_plus("scandirat");

3365

}

3366

close(dir_fd);

3367

}

3368

3369

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

3370

if(tempdir != NULL){

3371

clean_dir_at(-1, tempdir, 0);

2308

direntry = direntries[i];

2309

char *fullname = NULL;

2310

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

2311

direntry->d_name);

2312

if(ret < 0){

2313

perror_plus("asprintf");

2314

continue;

2315

}

2316

ret = remove(fullname);

2317

if(ret == -1){

2318

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

2319

strerror(errno));

2320

}

2321

free(fullname);

2322

}

2323

}

2324

2325

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

2326

free(direntries);

2327

if (numentries == -1){

2328

perror_plus("scandir");

2329

}

2330

ret = rmdir(tempdir);

2331

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

2332

perror_plus("rmdir");

2333

}

3372

2334

}

3373

2335

3374

2336

if(quit_now){