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237.7.791
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2021-03-21 20:46:40 UTC
- mto: This revision was merged to the branch mainline in revision 406.
- Revision ID: teddy@recompile.se-20210321204640-lpsyen8jr9lw1jma
Some cleanup of GnuTLS interface
Rename opaque internal GnuTLS structures named *_int to also start
with underscore (_), as is the custom in Python programs.
Decode byte strings from UTF-8 where needed. (Fixing, among other
things, all "DEBUG: GnuTLS" lines having a "b'" prefix in Python 3.)
Simplify calling C functions by:
1. Using the "_as_parameter_" attribute to store the ctypes object.
2. Creating and using helper classes to automatically create pointers
or cast typed pointers to pointers to void.
3. Providing the "from_param()" method on relevant classes.
Remove "restype" attribute on C functions where "errcheck" attribute
is already set.
* mandos (gnutls.session_int): Rename to start with "_".
(gnutls.openpgp_crt_int): - '' -
(gnutls.Error.__init__): Decode byte string from gnutls.strerror().
(gnutls.PointerTo): New helper class.
(gnutls.CastToVoidPointer): - '' -
(gnutls.With_from_param): - '' -
(gnutls.Credentials): Inherit from "With_from_param" and store the
ctypes object in the "_as_parameter_" attribute instead of
"_c_object".
(gnutls._error_code): Use "gnutls.E_SUCCESS" instead of the unadorned
numerical constant "0".
(gnutls._retry_on_error): - '' -
(gnutls.priority_set_direct.argtypes): Use "ClientSession" instead
of "session_t", and change all callers to match.
(gnutls.init.argtypes): Use "PointerTo(ClientSession)" instead of
"ctypes.POINTER(session_t)", and change all callers to match.
(gnutls.set_default_priority.argtypes): Use "ClientSession" instead
of "session_t", and change all callers to match.
(gnutls.record_send.argtypes): - '' -
(gnutls.certificate_allocate_credentials.argtypes): Use
"PointerTo(Credentials)" instead of
"ctypes.POINTER(certificate_credentials_t)", and change all callers
to match.
(gnutls.certificate_free_credentials.argtypes): Use "Credentials"
instead of "certificate_credentials_t", and change all callers to
match.
(gnutls.handshake_set_private_extensions.argtypes): Use
"ClientSession" instead of "session_t", and change all callers to
match.
(gnutls.credentials_set.argtypes): Use
"CastToVoidPointer(Credentials)" instead of "ctypes.c_void_p", and
change all callers to match.
(gnutls.certificate_type_get.argtypes): Use "ClientSession" instead
of "session_t", and change all callers to match.
(gnutls.certificate_get_peers.argtypes): - '' -
(gnutls.deinit.argtypes): - '' -
(gnutls.handshake.argtypes): - '' -
(gnutls.handshake.restype): Change from "_error_code" to
"ctypes.c_int".
(gnutls.transport_set_ptr.argtypes): Use "ClientSession" instead of
"session_t", and change all callers to match.
(gnutls.bye.argtypes): - '' -
(gnutls.bye.restype): Change from "_error_code" to "ctypes.c_int".
(gnutls.certificate_type_get2.argtypes): Use "ClientSession" instead
of "session_t", and change all callers to match.
(ClientHandler.handle): Decode "key_id" bytes to string before
logging it in the debug log.
(main.debug_gnutls): Decode GnuTLS log message from bytes to string
before logging it in the debug log.
Rename opaque internal GnuTLS structures named *_int to also start
with underscore (_), as is the custom in Python programs.
Decode byte strings from UTF-8 where needed. (Fixing, among other
things, all "DEBUG: GnuTLS" lines having a "b'" prefix in Python 3.)
Simplify calling C functions by:
1. Using the "_as_parameter_" attribute to store the ctypes object.
2. Creating and using helper classes to automatically create pointers
or cast typed pointers to pointers to void.
3. Providing the "from_param()" method on relevant classes.
Remove "restype" attribute on C functions where "errcheck" attribute
is already set.
* mandos (gnutls.session_int): Rename to start with "_".
(gnutls.openpgp_crt_int): - '' -
(gnutls.Error.__init__): Decode byte string from gnutls.strerror().
(gnutls.PointerTo): New helper class.
(gnutls.CastToVoidPointer): - '' -
(gnutls.With_from_param): - '' -
(gnutls.Credentials): Inherit from "With_from_param" and store the
ctypes object in the "_as_parameter_" attribute instead of
"_c_object".
(gnutls._error_code): Use "gnutls.E_SUCCESS" instead of the unadorned
numerical constant "0".
(gnutls._retry_on_error): - '' -
(gnutls.priority_set_direct.argtypes): Use "ClientSession" instead
of "session_t", and change all callers to match.
(gnutls.init.argtypes): Use "PointerTo(ClientSession)" instead of
"ctypes.POINTER(session_t)", and change all callers to match.
(gnutls.set_default_priority.argtypes): Use "ClientSession" instead
of "session_t", and change all callers to match.
(gnutls.record_send.argtypes): - '' -
(gnutls.certificate_allocate_credentials.argtypes): Use
"PointerTo(Credentials)" instead of
"ctypes.POINTER(certificate_credentials_t)", and change all callers
to match.
(gnutls.certificate_free_credentials.argtypes): Use "Credentials"
instead of "certificate_credentials_t", and change all callers to
match.
(gnutls.handshake_set_private_extensions.argtypes): Use
"ClientSession" instead of "session_t", and change all callers to
match.
(gnutls.credentials_set.argtypes): Use
"CastToVoidPointer(Credentials)" instead of "ctypes.c_void_p", and
change all callers to match.
(gnutls.certificate_type_get.argtypes): Use "ClientSession" instead
of "session_t", and change all callers to match.
(gnutls.certificate_get_peers.argtypes): - '' -
(gnutls.deinit.argtypes): - '' -
(gnutls.handshake.argtypes): - '' -
(gnutls.handshake.restype): Change from "_error_code" to
"ctypes.c_int".
(gnutls.transport_set_ptr.argtypes): Use "ClientSession" instead of
"session_t", and change all callers to match.
(gnutls.bye.argtypes): - '' -
(gnutls.bye.restype): Change from "_error_code" to "ctypes.c_int".
(gnutls.certificate_type_get2.argtypes): Use "ClientSession" instead
of "session_t", and change all callers to match.
(ClientHandler.handle): Decode "key_id" bytes to string before
logging it in the debug log.
(main.debug_gnutls): Decode GnuTLS log message from bytes to string
before logging it in the debug log.
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
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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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* Copyright © 2008-2013 Teddy Hogeborn
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* Copyright © 2008-2013 Björn Påhlsson
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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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* Copyright © 2008-2021 Teddy Hogeborn
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* Copyright © 2008-2021 Björn Påhlsson
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*
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* This file is part of Mandos.
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*
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mandos is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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*
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* Contact the authors at <mandos@recompile.se>.
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*/
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/* Needed by GPGME, specifically gpgme_data_seek() */
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#ifndef _LARGEFILE_SOURCE
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#define _LARGEFILE_SOURCE
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#endif
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#endif /* not _LARGEFILE_SOURCE */
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#ifndef _FILE_OFFSET_BITS
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#define _FILE_OFFSET_BITS 64
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#endif
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#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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#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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#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* memset(), strcmp(), strlen(),
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strerror(), asprintf(), strcpy() */
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#include <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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#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 */
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#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(),
92
srand(), mkdtemp(), abort() */
93
#include <string.h> /* strdup(), strcmp(), strlen(),
94
strerror(), strncpy(), strspn(),
95
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 <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 */
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#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 <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 <argz.h> /* argz_add_sep(), argz_next(),
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argz_delete(), argz_append(),
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argz_stringify(), argz_add(),
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argz_count() */
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#include <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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#ifdef __linux__
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#include <sys/klog.h> /* klogctl() */
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/* GnuTLS */
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#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
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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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functions: gnutls_*, GNUTLS_* */
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#if GNUTLS_VERSION_NUMBER < 0x030600
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#include <gnutls/openpgp.h>
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/* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
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#elif GNUTLS_VERSION_NUMBER >= 0x030606
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#include <gnutls/x509.h> /* GNUTLS_PKCS_PLAIN,
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GNUTLS_PKCS_NULL_PASSWORD */
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#endif
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/* GPGME */
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#include <gpgme.h> /* All GPGME types, constants and
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functions:
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gpgme_*
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GPGME_PROTOCOL_OpenPGP,
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GPG_ERR_NO_* */
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gpgme_*, GPG_ERR_NO_*,
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GPGME_IMPORT_*
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GPGME_PROTOCOL_OpenPGP */
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#define BUFFER_SIZE 256
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#define PATHDIR "/conf/conf.d/mandos"
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#define SECKEY "seckey.txt"
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#define PUBKEY "pubkey.txt"
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#define TLS_PRIVKEY "tls-privkey.pem"
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#define TLS_PUBKEY "tls-pubkey.pem"
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#define HOOKDIR "/lib/mandos/network-hooks.d"
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bool debug = false;
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static const char 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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perror(print_text);
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}
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__attribute__((format (gnu_printf, 2, 3)))
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__attribute__((format (gnu_printf, 2, 3), nonnull))
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int fprintf_plus(FILE *stream, const char *format, ...){
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va_list ap;
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va_start (ap, format);
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* bytes. "buffer_capacity" is how much is currently allocated,
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* "buffer_length" is how much is already used.
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*/
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__attribute__((nonnull, warn_unused_result))
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size_t incbuffer(char **buffer, size_t buffer_length,
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size_t buffer_capacity){
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
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*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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if(buffer == NULL){
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char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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if(new_buf == NULL){
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int old_errno = errno;
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free(*buffer);
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errno = old_errno;
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*buffer = NULL;
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return 0;
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}
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*buffer = new_buf;
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buffer_capacity += BUFFER_SIZE;
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}
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return buffer_capacity;
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}
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/* Add server to set of servers to retry periodically */
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__attribute__((nonnull, warn_unused_result))
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bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
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int af, server **current_server){
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int ret;
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.af = af };
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if(new_server->ip == NULL){
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perror_plus("strdup");
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free(new_server);
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return false;
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}
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ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
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if(ret == -1){
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perror_plus("clock_gettime");
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#ifdef __GNUC__
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-qual"
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#endif
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free((char *)(new_server->ip));
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#ifdef __GNUC__
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#pragma GCC diagnostic pop
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#endif
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free(new_server);
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return false;
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}
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/* Special case of first server */
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new_server->next = new_server;
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new_server->prev = new_server;
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*current_server = new_server;
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/* Place the new server last in the list */
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} else {
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/* Place the new server last in the list */
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new_server->next = *current_server;
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new_server->prev = (*current_server)->prev;
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new_server->prev->next = new_server;
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(*current_server)->prev = new_server;
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}
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ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
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if(ret == -1){
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perror_plus("clock_gettime");
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return false;
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}
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return true;
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}
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/* Set effective uid to 0, return errno */
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__attribute__((warn_unused_result))
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int raise_privileges(void){
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int old_errno = errno;
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int ret = 0;
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if(seteuid(0) == -1){
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ret = errno;
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}
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errno = old_errno;
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return ret;
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}
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/* Set effective and real user ID to 0. Return errno. */
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__attribute__((warn_unused_result))
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int raise_privileges_permanently(void){
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int old_errno = errno;
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int ret = raise_privileges();
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if(ret != 0){
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errno = old_errno;
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return ret;
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}
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if(setuid(0) == -1){
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ret = errno;
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}
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errno = old_errno;
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return ret;
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}
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/* Set effective user ID to unprivileged saved user ID */
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__attribute__((warn_unused_result))
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int lower_privileges(void){
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int old_errno = errno;
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int ret = 0;
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if(seteuid(uid) == -1){
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ret = errno;
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}
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errno = old_errno;
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return ret;
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}
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/* Lower privileges permanently */
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__attribute__((warn_unused_result))
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int lower_privileges_permanently(void){
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int old_errno = errno;
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int ret = 0;
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if(setuid(uid) == -1){
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ret = errno;
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}
361
errno = old_errno;
362
return ret;
363
}
364
247
365
/*
248
366
* Initialize GPGME.
249
367
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
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){
252
373
gpgme_error_t rc;
253
374
gpgme_engine_info_t engine_info;
254
375
255
376
/*
256
377
* Helper function to insert pub and seckey to the engine keyring.
257
378
*/
258
bool import_key(const char *filename){
379
bool import_key(const char * const filename){
259
380
int ret;
260
381
int fd;
261
382
gpgme_data_t pgp_data;
266
387
return false;
267
388
}
268
389
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
269
439
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
440
if(rc != GPG_ERR_NO_ERROR){
271
441
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
279
449
gpgme_strsource(rc), gpgme_strerror(rc));
280
450
return false;
281
451
}
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
}
282
527
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
528
ret = close(fd);
284
529
if(ret == -1){
285
530
perror_plus("close");
286
531
}
325
570
/* Create new GPGME "context" */
326
571
rc = gpgme_new(&(mc->ctx));
327
572
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
331
575
return false;
332
576
}
333
577
342
586
* Decrypt OpenPGP data.
343
587
* Returns -1 on error
344
588
*/
589
__attribute__((nonnull, warn_unused_result))
345
590
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
591
size_t crypto_size,
347
592
char **plaintext,
368
613
/* Create new empty GPGME data buffer for the plaintext */
369
614
rc = gpgme_data_new(&dh_plain);
370
615
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
373
617
gpgme_strsource(rc), gpgme_strerror(rc));
374
618
gpgme_data_release(dh_crypto);
375
619
return -1;
388
632
if(result == NULL){
389
633
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
634
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
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");
395
641
if(result->file_name != NULL){
396
642
fprintf_plus(stderr, "File name: %s\n", result->file_name);
397
643
}
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
400
while(recipient != NULL){
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
401
647
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
648
gpgme_pubkey_algo_name(r->pubkey_algo));
649
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
405
650
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
409
652
}
410
653
}
411
654
}
467
710
return plaintext_length;
468
711
}
469
712
470
static const char * safer_gnutls_strerror(int value){
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){
471
722
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
723
return safe_string(ret);
475
724
}
476
725
477
726
/* GnuTLS log function callback */
727
__attribute__((nonnull))
478
728
static void debuggnutls(__attribute__((unused)) int level,
479
729
const char* string){
480
730
fprintf_plus(stderr, "GnuTLS: %s", string);
481
731
}
482
732
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
734
static int init_gnutls_global(const char *pubkeyfilename,
484
735
const char *seckeyfilename,
736
const char *dhparamsfilename,
485
737
mandos_context *mc){
486
738
int ret;
487
739
489
741
fprintf_plus(stderr, "Initializing GnuTLS\n");
490
742
}
491
743
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
499
744
if(debug){
500
745
/* "Use a log level over 10 to enable all debugging options."
501
746
* - GnuTLS manual
509
754
if(ret != GNUTLS_E_SUCCESS){
510
755
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
756
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
513
757
return -1;
514
758
}
515
759
516
760
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
519
763
pubkeyfilename,
520
764
seckeyfilename);
521
765
}
522
766
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
523
780
ret = gnutls_certificate_set_openpgp_key_file
524
781
(mc->cred, pubkeyfilename, seckeyfilename,
525
782
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
526
786
if(ret != GNUTLS_E_SUCCESS){
527
787
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
788
"Error[%d] while reading the key pair ('%s',"
529
789
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
790
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
791
safer_gnutls_strerror(ret));
540
800
safer_gnutls_strerror(ret));
541
801
goto globalfail;
542
802
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
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 **)¶ms.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, ¶ms,
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
}
551
985
552
986
return 0;
553
987
554
988
globalfail:
555
989
556
990
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
558
991
gnutls_dh_params_deinit(mc->dh_params);
559
992
return -1;
560
993
}
561
994
995
__attribute__((nonnull, warn_unused_result))
562
996
static int init_gnutls_session(gnutls_session_t *session,
563
997
mandos_context *mc){
564
998
int ret;
565
999
/* GnuTLS session creation */
566
1000
do {
567
ret = gnutls_init(session, GNUTLS_SERVER);
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
));
568
1009
if(quit_now){
569
1010
return -1;
570
1011
}
611
1052
/* ignore client certificate if any. */
612
1053
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
1054
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
616
1055
return 0;
617
1056
}
618
1057
620
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
1060
__attribute__((unused)) const char *txt){}
622
1061
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
623
1235
/* Called when a Mandos server is found */
1236
__attribute__((nonnull, warn_unused_result))
624
1237
static int start_mandos_communication(const char *ip, in_port_t port,
625
1238
AvahiIfIndex if_index,
626
1239
int af, mandos_context *mc){
627
1240
int ret, tcp_sd = -1;
628
1241
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1242
struct sockaddr_storage to;
633
1243
char *buffer = NULL;
634
1244
char *decrypted_buffer = NULL;
635
1245
size_t buffer_length = 0;
638
1248
int retval = -1;
639
1249
gnutls_session_t session;
640
1250
int pf; /* Protocol family */
1251
bool route_added = false;
641
1252
642
1253
errno = 0;
643
1254
665
1276
bool match = false;
666
1277
{
667
1278
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
670
1282
if(if_nametoindex(interface) == (unsigned int)if_index){
671
1283
match = true;
672
1284
break;
701
1313
PRIuMAX "\n", ip, (uintmax_t)port);
702
1314
}
703
1315
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
705
1317
if(tcp_sd < 0){
706
1318
int e = errno;
707
1319
perror_plus("socket");
714
1326
goto mandos_end;
715
1327
}
716
1328
717
memset(&to, 0, sizeof(to));
718
1329
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
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);
721
1333
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
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);
724
1337
}
725
1338
if(ret < 0 ){
726
1339
int e = errno;
735
1348
goto mandos_end;
736
1349
}
737
1350
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
1351
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1352
if(IN6_IS_ADDR_LINKLOCAL
1353
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
748
1354
if(if_index == AVAHI_IF_UNSPEC){
749
1355
fprintf_plus(stderr, "An IPv6 link-local address is"
750
1356
" incomplete without a network interface\n");
752
1358
goto mandos_end;
753
1359
}
754
1360
/* Set the network interface number as scope */
755
to.in6.sin6_scope_id = (uint32_t)if_index;
1361
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
756
1362
}
757
1363
} else {
758
to.in.sin_port = htons(port);
1364
((struct sockaddr_in *)&to)->sin_port = htons(port);
759
1365
}
760
1366
761
1367
if(quit_now){
778
1384
}
779
1385
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
1386
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
781
const char *pcret;
782
if(af == AF_INET6){
783
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
784
sizeof(addrstr));
785
} else {
786
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
787
sizeof(addrstr));
788
}
789
if(pcret == NULL){
790
perror_plus("inet_ntop");
791
} else {
792
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
794
}
795
}
796
}
797
798
if(quit_now){
799
errno = EINTR;
800
goto mandos_end;
801
}
802
803
if(af == AF_INET6){
804
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
} else {
806
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
807
}
808
if(ret < 0){
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
int e = errno;
811
perror_plus("connect");
812
errno = e;
813
}
814
goto mandos_end;
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
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;
820
1467
}
821
1468
822
1469
const char *out = mandos_protocol_version;
976
1623
&decrypted_buffer, mc);
977
1624
if(decrypted_buffer_size >= 0){
978
1625
1626
clearerr(stdout);
979
1627
written = 0;
980
1628
while(written < (size_t) decrypted_buffer_size){
981
1629
if(quit_now){
997
1645
}
998
1646
written += (size_t)ret;
999
1647
}
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
}
1000
1658
retval = 0;
1001
1659
}
1002
1660
}
1005
1663
1006
1664
mandos_end:
1007
1665
{
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
}
1008
1672
int e = errno;
1009
1673
free(decrypted_buffer);
1010
1674
free(buffer);
1011
1675
if(tcp_sd >= 0){
1012
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1676
ret = close(tcp_sd);
1013
1677
}
1014
1678
if(ret == -1){
1015
1679
if(e == 0){
1040
1704
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
1705
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1042
1706
flags,
1043
void* mc){
1707
void *mc){
1044
1708
if(r == NULL){
1045
1709
return;
1046
1710
}
1049
1713
timed out */
1050
1714
1051
1715
if(quit_now){
1716
avahi_s_service_resolver_free(r);
1052
1717
return;
1053
1718
}
1054
1719
1099
1764
const char *domain,
1100
1765
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1101
1766
flags,
1102
void* mc){
1767
void *mc){
1103
1768
if(b == NULL){
1104
1769
return;
1105
1770
}
1165
1830
errno = old_errno;
1166
1831
}
1167
1832
1833
__attribute__((nonnull, warn_unused_result))
1168
1834
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
1835
int ret;
1170
error_t ret_errno;
1836
int old_errno;
1171
1837
1172
1838
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
1839
if(s < 0){
1174
ret_errno = errno;
1840
old_errno = errno;
1175
1841
perror_plus("socket");
1176
errno = ret_errno;
1842
errno = old_errno;
1177
1843
return false;
1178
1844
}
1179
strcpy(ifr->ifr_name, ifname);
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1180
1847
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
1848
if(ret == -1){
1182
1849
if(debug){
1183
ret_errno = errno;
1850
old_errno = errno;
1184
1851
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1852
errno = old_errno;
1853
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1186
1858
}
1187
1859
return false;
1188
1860
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1189
1866
return true;
1190
1867
}
1191
1868
1869
__attribute__((nonnull, warn_unused_result))
1192
1870
bool good_flags(const char *ifname, const struct ifreq *ifr){
1193
1871
1194
1872
/* Reject the loopback device */
1236
1914
* corresponds to an acceptable network device.
1237
1915
* (This function is passed to scandir(3) as a filter function.)
1238
1916
*/
1917
__attribute__((nonnull, warn_unused_result))
1239
1918
int good_interface(const struct dirent *if_entry){
1240
1919
if(if_entry->d_name[0] == '.'){
1241
1920
return 0;
1259
1938
/*
1260
1939
* This function determines if a network interface is up.
1261
1940
*/
1941
__attribute__((nonnull, warn_unused_result))
1262
1942
bool interface_is_up(const char *interface){
1263
1943
struct ifreq ifr;
1264
1944
if(not get_flags(interface, &ifr)){
1275
1955
/*
1276
1956
* This function determines if a network interface is running
1277
1957
*/
1958
__attribute__((nonnull, warn_unused_result))
1278
1959
bool interface_is_running(const char *interface){
1279
1960
struct ifreq ifr;
1280
1961
if(not get_flags(interface, &ifr)){
1288
1969
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1289
1970
}
1290
1971
1972
__attribute__((nonnull, pure, warn_unused_result))
1291
1973
int notdotentries(const struct dirent *direntry){
1292
1974
/* Skip "." and ".." */
1293
1975
if(direntry->d_name[0] == '.'
1300
1982
}
1301
1983
1302
1984
/* Is this directory entry a runnable program? */
1985
__attribute__((nonnull, warn_unused_result))
1303
1986
int runnable_hook(const struct dirent *direntry){
1304
1987
int ret;
1305
1988
size_t sret;
1313
1996
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
1997
"abcdefghijklmnopqrstuvwxyz"
1315
1998
"0123456789"
1316
"_-");
1999
"_.-");
1317
2000
if((direntry->d_name)[sret] != '\0'){
1318
2001
/* Contains non-allowed characters */
1319
2002
if(debug){
1323
2006
return 0;
1324
2007
}
1325
2008
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
2009
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1334
2010
if(ret == -1){
1335
2011
if(debug){
1336
2012
perror_plus("Could not stat hook");
1360
2036
return 1;
1361
2037
}
1362
2038
2039
__attribute__((nonnull, warn_unused_result))
1363
2040
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
2041
mandos_context *mc){
1365
2042
int ret;
1369
2046
1370
2047
while(true){
1371
2048
if(mc->current_server == NULL){
1372
if (debug){
2049
if(debug){
1373
2050
fprintf_plus(stderr, "Wait until first server is found."
1374
2051
" No timeout!\n");
1375
2052
}
1376
2053
ret = avahi_simple_poll_iterate(s, -1);
1377
2054
} else {
1378
if (debug){
2055
if(debug){
1379
2056
fprintf_plus(stderr, "Check current_server if we should run"
1380
2057
" it, or wait\n");
1381
2058
}
1398
2075
- ((intmax_t)waited_time.tv_sec * 1000))
1399
2076
- ((intmax_t)waited_time.tv_nsec / 1000000));
1400
2077
1401
if (debug){
2078
if(debug){
1402
2079
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
2080
block_time);
1404
2081
}
1426
2103
ret = avahi_simple_poll_iterate(s, (int)block_time);
1427
2104
}
1428
2105
if(ret != 0){
1429
if (ret > 0 or errno != EINTR){
2106
if(ret > 0 or errno != EINTR){
1430
2107
return (ret != 1) ? ret : 0;
1431
2108
}
1432
2109
}
1433
2110
}
1434
2111
}
1435
2112
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
2113
__attribute__((nonnull))
2114
void run_network_hooks(const char *mode, const char *interface,
1489
2115
const float delay){
1490
struct dirent **direntries;
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);
2139
if(numhooks == -1){
2140
perror_plus("scandir");
2141
close(devnull);
2142
return;
2143
}
1491
2144
struct dirent *direntry;
1492
2145
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
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);
1503
2151
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
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){
1511
2198
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
2199
_exit(EX_OSERR);
2200
}
2201
ret = setenv("DELAY", delaystring, 1);
2202
if(ret == -1){
1570
2203
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
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;
1582
2272
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
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);
1619
2292
}
1620
2293
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
2294
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2296
const float delay){
2297
int old_errno = errno;
2298
int ret;
1627
2299
struct ifreq network;
1628
2300
unsigned int if_index = if_nametoindex(interface);
1629
2301
if(if_index == 0){
1638
2310
}
1639
2311
1640
2312
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network)){
1642
2316
ret_errno = errno;
1643
2317
fprintf_plus(stderr, "Failed to get flags for interface "
1644
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
1645
2320
return ret_errno;
1646
2321
}
1647
network.ifr_flags |= IFF_UP;
2322
network.ifr_flags |= IFF_UP; /* set flag */
1648
2323
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
1651
2326
ret_errno = errno;
1652
2327
perror_plus("socket");
1653
2328
errno = old_errno;
1654
2329
return ret_errno;
1655
2330
}
1656
2331
1657
2332
if(quit_now){
1658
close(sd);
2333
ret = close(sd);
2334
if(ret == -1){
2335
perror_plus("close");
2336
}
1659
2337
errno = old_errno;
1660
2338
return EINTR;
1661
2339
}
1665
2343
interface);
1666
2344
}
1667
2345
1668
/* Raise priviliges */
1669
raise_privileges();
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
}
1670
2352
1671
2353
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
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
}
1679
2365
}
1680
2366
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
2367
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2368
ioctl_errno = errno;
1683
2369
#ifdef __linux__
1684
2370
if(restore_loglevel){
1685
2371
ret_linux = klogctl(7, NULL, 0);
1689
2375
}
1690
2376
#endif /* __linux__ */
1691
2377
1692
/* Lower privileges */
1693
lower_privileges();
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
}
1694
2387
1695
2388
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2389
ret = close(sd);
1697
2390
if(ret == -1){
1698
2391
perror_plus("close");
1699
2392
}
1700
2393
1701
2394
if(ret_setflags == -1){
1702
errno = ret_errno;
2395
errno = ioctl_errno;
1703
2396
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
2397
errno = old_errno;
1705
return ret_errno;
2398
return ioctl_errno;
1706
2399
}
1707
2400
} else if(debug){
1708
2401
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1711
2404
1712
2405
/* Sleep checking until interface is running.
1713
2406
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
2407
for(int i = 0; i < delay * 4; i++){
1715
2408
if(interface_is_running(interface)){
1716
2409
break;
1717
2410
}
1726
2419
return 0;
1727
2420
}
1728
2421
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
2422
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
1734
2425
struct ifreq network;
1735
2426
unsigned int if_index = if_nametoindex(interface);
1736
2427
if(if_index == 0){
1739
2430
return ENXIO;
1740
2431
}
1741
2432
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
1742
2435
if(not get_flags(interface, &network) and debug){
1743
2436
ret_errno = errno;
1744
2437
fprintf_plus(stderr, "Failed to get flags for interface "
1745
2438
"\"%s\"\n", interface);
2439
errno = old_errno;
1746
2440
return ret_errno;
1747
2441
}
1748
2442
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
2443
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
2444
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2445
if(sd == -1){
1752
2446
ret_errno = errno;
1753
2447
perror_plus("socket");
1754
2448
errno = old_errno;
1760
2454
interface);
1761
2455
}
1762
2456
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
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
}
1771
2476
1772
2477
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2478
int ret = close(sd);
1774
2479
if(ret == -1){
1775
2480
perror_plus("close");
1776
2481
}
1777
2482
1778
2483
if(ret_setflags == -1){
1779
errno = ret_errno;
2484
errno = ioctl_errno;
1780
2485
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
2486
errno = old_errno;
1782
return ret_errno;
2487
return ioctl_errno;
1783
2488
}
1784
2489
} else if(debug){
1785
2490
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1791
2496
}
1792
2497
1793
2498
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
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 };
1798
2512
AvahiSServiceBrowser *sb = NULL;
1799
2513
error_t ret_errno;
1800
2514
int ret;
1803
2517
int exitcode = EXIT_SUCCESS;
1804
2518
char *interfaces_to_take_down = NULL;
1805
2519
size_t interfaces_to_take_down_size = 0;
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1807
bool tempdir_created = false;
2520
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2521
char old_tempdir[] = "/tmp/mandosXXXXXX";
2522
char *tempdir = NULL;
1808
2523
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
2524
const char *seckey = PATHDIR "/" SECKEY;
1810
2525
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;
1811
2531
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1813
2532
1814
2533
bool gnutls_initialized = false;
1815
2534
bool gpgme_initialized = false;
1861
2580
{ .name = "pubkey", .key = 'p',
1862
2581
.arg = "FILE",
1863
2582
.doc = "OpenPGP public key file base name",
1864
.group = 2 },
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 },
1865
2600
{ .name = "dh-bits", .key = 129,
1866
2601
.arg = "BITS",
1867
2602
.doc = "Bit length of the prime number used in the"
1868
2603
" Diffie-Hellman key exchange",
1869
2604
.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 },
1870
2610
{ .name = "priority", .key = 130,
1871
2611
.arg = "STRING",
1872
2612
.doc = "GnuTLS priority string for the TLS handshake",
1918
2658
case 'p': /* --pubkey */
1919
2659
pubkey = arg;
1920
2660
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;
1921
2671
case 129: /* --dh-bits */
1922
2672
errno = 0;
1923
2673
tmpmax = strtoimax(arg, &tmp, 10);
1927
2677
}
1928
2678
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1929
2679
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
1930
2683
case 130: /* --priority */
1931
2684
mc.priority = arg;
1932
2685
break;
1955
2708
argp_state_help(state, state->out_stream,
1956
2709
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1957
2710
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
1958
2712
case -3: /* --usage */
1959
2713
argp_state_help(state, state->out_stream,
1960
2714
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
1961
2716
case 'V': /* --version */
1962
2717
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
2718
exit(argp_err_exit_status);
1972
2727
.args_doc = "",
1973
2728
.doc = "Mandos client -- Get and decrypt"
1974
2729
" passwords from a Mandos server" };
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
1978
2733
case 0:
1979
2734
break;
1980
2735
case ENOMEM:
1981
2736
default:
1982
errno = ret;
2737
errno = ret_errno;
1983
2738
perror_plus("argp_parse");
1984
2739
exitcode = EX_OSERR;
1985
2740
goto end;
1988
2743
goto end;
1989
2744
}
1990
2745
}
1991
2746
1992
2747
{
1993
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
1995
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2748
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2752
perror_plus("Failed to raise privileges");
2753
} else {
1998
2754
struct stat st;
1999
2755
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2000
2759
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
2760
int seckey_fd = open(seckey, O_RDONLY);
2002
2761
if(seckey_fd == -1){
2014
2773
}
2015
2774
}
2016
2775
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2776
close(seckey_fd);
2018
2777
}
2019
2778
}
2020
2779
2021
2780
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
2781
int pubkey_fd = open(pubkey, O_RDONLY);
2023
2782
if(pubkey_fd == -1){
2035
2794
}
2036
2795
}
2037
2796
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
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
2042
2832
/* Lower privileges */
2043
lower_privileges();
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2836
perror_plus("Failed to lower privileges");
2837
}
2044
2838
}
2045
2839
}
2046
2840
2070
2864
goto end;
2071
2865
}
2072
2866
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2867
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2868
}
2869
run_network_hooks("start", interfaces_hooks != NULL ?
2870
interfaces_hooks : "", delay);
2081
2871
}
2082
2872
2083
2873
if(not debug){
2161
2951
2162
2952
/* If no interfaces were specified, make a list */
2163
2953
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2954
struct dirent **direntries = NULL;
2165
2955
/* Look for any good interfaces */
2166
2956
ret = scandir(sys_class_net, &direntries, good_interface,
2167
2957
alphasort);
2171
2961
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
2962
direntries[i]->d_name);
2173
2963
if(ret_errno != 0){
2964
errno = ret_errno;
2174
2965
perror_plus("argz_add");
2966
free(direntries[i]);
2175
2967
continue;
2176
2968
}
2177
2969
if(debug){
2178
2970
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
2971
direntries[i]->d_name);
2180
2972
}
2973
free(direntries[i]);
2181
2974
}
2182
2975
free(direntries);
2183
2976
} else {
2184
free(direntries);
2977
if(ret == 0){
2978
free(direntries);
2979
}
2185
2980
fprintf_plus(stderr, "Could not find a network interface\n");
2186
2981
exitcode = EXIT_FAILURE;
2187
2982
goto end;
2210
3005
break;
2211
3006
}
2212
3007
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
3008
errno = bring_up_interface(interface, delay);
2214
3009
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
3010
if(errno != 0){
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
2218
3013
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
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
}
2222
3020
}
2223
3021
}
2224
3022
}
2240
3038
goto end;
2241
3039
}
2242
3040
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
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
2244
3048
if(ret == -1){
2245
3049
fprintf_plus(stderr, "init_gnutls_global failed\n");
2246
3050
exitcode = EX_UNAVAILABLE;
2253
3057
goto end;
2254
3058
}
2255
3059
2256
if(mkdtemp(tempdir) == NULL){
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){
2257
3070
perror_plus("mkdtemp");
2258
3071
goto end;
2259
3072
}
2260
tempdir_created = true;
2261
3073
2262
3074
if(quit_now){
2263
3075
goto end;
2338
3150
sleep((unsigned int)retry_interval);
2339
3151
}
2340
3152
2341
if (not quit_now){
3153
if(not quit_now){
2342
3154
exitcode = EXIT_SUCCESS;
2343
3155
}
2344
3156
2360
3172
2361
3173
/* Allocate a new server */
2362
3174
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
3175
&config, NULL, NULL, &ret);
2364
3176
2365
3177
/* Free the Avahi configuration data */
2366
3178
avahi_server_config_free(&config);
2369
3181
/* Check if creating the Avahi server object succeeded */
2370
3182
if(mc.server == NULL){
2371
3183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
3184
avahi_strerror(ret));
2373
3185
exitcode = EX_UNAVAILABLE;
2374
3186
goto end;
2375
3187
}
2399
3211
if(debug){
2400
3212
fprintf_plus(stderr, "Starting Avahi loop search\n");
2401
3213
}
2402
3214
2403
3215
ret = avahi_loop_with_timeout(simple_poll,
2404
3216
(int)(retry_interval * 1000), &mc);
2405
3217
if(debug){
2410
3222
end:
2411
3223
2412
3224
if(debug){
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
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
}
2414
3232
}
2415
3233
2416
3234
/* Cleanup things */
2427
3245
2428
3246
if(gnutls_initialized){
2429
3247
gnutls_certificate_free_credentials(mc.cred);
2430
gnutls_global_deinit();
2431
3248
gnutls_dh_params_deinit(mc.dh_params);
2432
3249
}
2433
3250
2441
3258
mc.current_server->prev->next = NULL;
2442
3259
while(mc.current_server != NULL){
2443
3260
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
2444
3269
free(mc.current_server);
2445
3270
mc.current_server = next;
2446
3271
}
2447
3272
}
2448
3273
2449
/* Re-raise priviliges */
3274
/* Re-raise privileges */
2450
3275
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
2467
}
2468
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2472
}
2473
}
2474
2475
lower_privileges_permanently();
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
}
3304
3305
ret = lower_privileges_permanently();
3306
if(ret != 0){
3307
errno = ret;
3308
perror_plus("Failed to lower privileges permanently");
3309
}
2476
3310
}
2477
3311
2478
3312
free(interfaces_to_take_down);
2479
3313
free(interfaces_hooks);
2480
3314
3315
void clean_dir_at(int base, const char * const dirname,
3316
uintmax_t level){
3317
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){
3331
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
2481
3369
/* Removes the GPGME temp directory and all files inside */
2482
if(tempdir_created){
2483
struct dirent **direntries = NULL;
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
2489
direntry = direntries[i];
2490
char *fullname = NULL;
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
direntry->d_name);
2493
if(ret < 0){
2494
perror_plus("asprintf");
2495
continue;
2496
}
2497
ret = remove(fullname);
2498
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2501
}
2502
free(fullname);
2503
}
2504
}
2505
2506
/* need to clean even if 0 because man page doesn't specify */
2507
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
2510
}
2511
ret = rmdir(tempdir);
2512
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
2514
}
3370
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
2515
3372
}
2516
3373
2517
3374
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0