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- Committer: Teddy Hogeborn
- Date: 2021-02-03 23:10:42 UTC
- Revision ID: teddy@recompile.se-20210203231042-2z3egrvpo1zt7nej
mandos-ctl: Fix bad test for command.Remove and related minor issues
The test for command.Remove removes all clients from the spy server,
and then loops over all clients, looking for the corresponding Remove
command as recorded by the spy server. But since since there aren't
any clients left after they were removed, no assertions are made, and
the test therefore does nothing. Fix this.
In tests for command.Approve and command.Deny, add checks that clients
were not somehow removed by the command (in which case, likewise, no
assertions are made).
Add related checks to TestPropertySetterCmd.runTest; i.e. test that a
sequence is not empty before looping over it and making assertions.
* mandos-ctl (TestBaseCommands.test_Remove): Save a copy of the
original "clients" dict, and loop over those instead. Add assertion
that all clients were indeed removed. Also fix the code which looks
for the Remove command, which now needs to actually work.
(TestBaseCommands.test_Approve, TestBaseCommands.test_Deny): Add
assertion that there are still clients before looping over them.
(TestPropertySetterCmd.runTest): Add assertion that the list of
values to get is not empty before looping over them. Also add check
that there are still clients before looping over clients.
The test for command.Remove removes all clients from the spy server,
and then loops over all clients, looking for the corresponding Remove
command as recorded by the spy server. But since since there aren't
any clients left after they were removed, no assertions are made, and
the test therefore does nothing. Fix this.
In tests for command.Approve and command.Deny, add checks that clients
were not somehow removed by the command (in which case, likewise, no
assertions are made).
Add related checks to TestPropertySetterCmd.runTest; i.e. test that a
sequence is not empty before looping over it and making assertions.
* mandos-ctl (TestBaseCommands.test_Remove): Save a copy of the
original "clients" dict, and loop over those instead. Add assertion
that all clients were indeed removed. Also fix the code which looks
for the Remove command, which now needs to actually work.
(TestBaseCommands.test_Approve, TestBaseCommands.test_Deny): Add
assertion that there are still clients before looping over them.
(TestPropertySetterCmd.runTest): Add assertion that the list of
values to get is not empty before looping over them. Also add check
that there are still clients before looping over clients.
- 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
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2021 Teddy Hogeborn
13
* Copyright © 2008-2021 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
39
#endif /* not _FILE_OFFSET_BITS */
40
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
48
44
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
45
#include <argp.h> /* argp_program_version,
46
argp_program_bug_address,
47
struct argp_option,
48
struct argp_state, argp_error(),
49
argp_state_help,
50
ARGP_HELP_STD_HELP,
51
ARGP_HELP_EXIT_ERR,
52
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
53
argp_err_exit_status,
54
ARGP_ERR_UNKNOWN, struct argp,
55
argp_parse(), ARGP_IN_ORDER,
56
ARGP_NO_HELP */
57
#include <stddef.h> /* NULL, size_t */
58
#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,
59
seteuid(), setuid(), pid_t,
60
setgid(), getuid(), getgid() */
61
#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
62
seteuid(), setuid(), close(),
63
ssize_t, read(), fork(), setgid(),
64
_exit(), dup2(), STDIN_FILENO,
65
STDERR_FILENO, STDOUT_FILENO,
66
fexecve(), write(), getuid(),
67
getgid(), fchown(), symlink(),
68
sleep(), unlinkat(), pause() */
69
#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,
70
sa_family_t, struct sockaddr_in,
71
htons(), IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
73
ntohl(), IPPROTO_IP */
74
#include <time.h> /* struct timespec, clock_gettime(),
75
CLOCK_MONOTONIC, time_t, struct tm,
76
gmtime_r(), clock_settime(),
77
CLOCK_REALTIME, nanosleep() */
78
#include <errno.h> /* errno,
79
program_invocation_short_name,
80
EINTR, EINVAL, ENETUNREACH,
81
EHOSTUNREACH, ECONNREFUSED, EPROTO,
82
EIO, ENOENT, ENXIO, error_t,
83
ENOMEM, EISDIR, ENOTEMPTY */
84
#include <stdio.h> /* fprintf(), stderr, perror(), FILE,
85
vfprintf(), off_t, SEEK_SET,
86
stdout, fwrite(), ferror(),
87
fflush(), asprintf() */
88
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
89
#include <stdlib.h> /* realloc(), free(), malloc(),
90
getenv(), EXIT_FAILURE, setenv(),
91
EXIT_SUCCESS, strtof(), strtod(),
92
srand(), mkdtemp(), abort() */
93
#include <string.h> /* strdup(), strcmp(), strlen(),
94
strerror(), strncpy(), strspn(),
95
memcpy(), strrchr(), strchr(),
96
strsignal() */
97
#include <fcntl.h> /* open(), O_RDONLY, O_DIRECTORY,
98
O_PATH, O_CLOEXEC, openat(),
99
O_NOFOLLOW, AT_REMOVEDIR */
100
#include <iso646.h> /* or, and, not */
101
#include <sys/stat.h> /* struct stat, fstat(), fstatat(),
102
S_ISREG(), S_IXUSR, S_IXGRP,
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S_IXOTH, lstat() */
104
#include <net/if.h> /* IF_NAMESIZE, if_indextoname(),
105
if_nametoindex(), SIOCGIFFLAGS,
106
IFF_LOOPBACK, IFF_POINTOPOINT,
107
IFF_BROADCAST, IFF_NOARP, IFF_UP,
108
IFF_RUNNING, SIOCSIFFLAGS */
109
#include <sysexits.h> /* EX_NOPERM, EX_OSERR,
110
EX_UNAVAILABLE, EX_USAGE */
111
#include <grp.h> /* setgroups() */
112
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
113
WEXITSTATUS(), WIFSIGNALED(),
114
WTERMSIG() */
115
#include <signal.h> /* kill(), SIGTERM, struct sigaction,
116
SIG_DFL, sigemptyset(),
117
sigaddset(), SIGINT, SIGHUP,
118
SIG_IGN, raise() */
119
#include <sys/socket.h> /* struct sockaddr_storage, AF_INET6,
120
PF_INET6, AF_INET, PF_INET,
121
socket(), SOCK_STREAM,
122
SOCK_CLOEXEC, struct sockaddr,
123
connect(), SOCK_DGRAM */
124
#include <argz.h> /* argz_next(), argz_add_sep(),
125
argz_delete(), argz_stringify(),
126
argz_add(), argz_count() */
127
#include <inttypes.h> /* PRIuMAX, uintmax_t, uint32_t,
128
PRIdMAX, PRIu16, intmax_t,
63
129
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
130
#include <arpa/inet.h> /* inet_pton() */
131
#include <stdint.h> /* uint32_t, intptr_t, uint16_t */
132
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
EAI_SYSTEM, gai_strerror() */
134
#include <sys/ioctl.h> /* ioctl() */
135
#include <dirent.h> /* struct dirent, scandirat(),
136
alphasort(), scandir() */
137
#include <limits.h> /* INT_MAX */
94
138
95
139
#ifdef __linux__
96
140
#include <sys/klog.h> /* klogctl() */
109
153
110
154
/* GnuTLS */
111
155
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
112
functions:
113
gnutls_*
114
init_gnutls_session(),
115
GNUTLS_* */
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
116
158
#include <gnutls/openpgp.h>
117
159
/* gnutls_certificate_set_openpgp_key_file(),
118
160
GNUTLS_OPENPGP_FMT_BASE64 */
161
#elif GNUTLS_VERSION_NUMBER >= 0x030606
162
#include <gnutls/x509.h> /* GNUTLS_PKCS_PLAIN,
163
GNUTLS_PKCS_NULL_PASSWORD */
164
#endif
119
165
120
166
/* GPGME */
121
167
#include <gpgme.h> /* All GPGME types, constants and
122
168
functions:
123
gpgme_*
124
GPGME_PROTOCOL_OpenPGP,
125
GPG_ERR_NO_* */
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
126
172
127
173
#define BUFFER_SIZE 256
128
174
129
175
#define PATHDIR "/conf/conf.d/mandos"
130
176
#define SECKEY "seckey.txt"
131
177
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
132
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#define HOOKDIR "/lib/mandos/network-hooks.d"
133
181
134
182
bool debug = false;
138
186
static const char sys_class_net[] = "/sys/class/net";
139
187
char *connect_to = NULL;
140
188
const char *hookdir = HOOKDIR;
189
int hookdir_fd = -1;
141
190
uid_t uid = 65534;
142
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gid_t gid = 65534;
143
192
161
210
const char *priority;
162
211
gpgme_ctx_t ctx;
163
212
server *current_server;
213
char *interfaces;
214
size_t interfaces_size;
164
215
} mandos_context;
165
216
166
217
/* global so signal handler can reach it*/
178
229
perror(print_text);
179
230
}
180
231
181
__attribute__((format (gnu_printf, 2, 3)))
232
__attribute__((format (gnu_printf, 2, 3), nonnull))
182
233
int fprintf_plus(FILE *stream, const char *format, ...){
183
234
va_list ap;
184
235
va_start (ap, format);
185
236
186
237
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
187
238
program_invocation_short_name));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
239
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
240
}
190
241
191
242
/*
193
244
* bytes. "buffer_capacity" is how much is currently allocated,
194
245
* "buffer_length" is how much is already used.
195
246
*/
247
__attribute__((nonnull, warn_unused_result))
196
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size_t incbuffer(char **buffer, size_t buffer_length,
197
249
size_t buffer_capacity){
198
250
if(buffer_length + BUFFER_SIZE > buffer_capacity){
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
200
if(buffer == NULL){
251
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
252
if(new_buf == NULL){
253
int old_errno = errno;
254
free(*buffer);
255
errno = old_errno;
256
*buffer = NULL;
201
257
return 0;
202
258
}
259
*buffer = new_buf;
203
260
buffer_capacity += BUFFER_SIZE;
204
261
}
205
262
return buffer_capacity;
206
263
}
207
264
208
265
/* Add server to set of servers to retry periodically */
266
__attribute__((nonnull, warn_unused_result))
209
267
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
210
268
int af, server **current_server){
211
269
int ret;
220
278
.af = af };
221
279
if(new_server->ip == NULL){
222
280
perror_plus("strdup");
281
free(new_server);
282
return false;
283
}
284
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
285
if(ret == -1){
286
perror_plus("clock_gettime");
287
#ifdef __GNUC__
288
#pragma GCC diagnostic push
289
#pragma GCC diagnostic ignored "-Wcast-qual"
290
#endif
291
free((char *)(new_server->ip));
292
#ifdef __GNUC__
293
#pragma GCC diagnostic pop
294
#endif
295
free(new_server);
223
296
return false;
224
297
}
225
298
/* Special case of first server */
227
300
new_server->next = new_server;
228
301
new_server->prev = new_server;
229
302
*current_server = new_server;
230
/* Place the new server last in the list */
231
303
} else {
304
/* Place the new server last in the list */
232
305
new_server->next = *current_server;
233
306
new_server->prev = (*current_server)->prev;
234
307
new_server->prev->next = new_server;
235
308
(*current_server)->prev = new_server;
236
309
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
310
return true;
243
311
}
244
312
313
/* Set effective uid to 0, return errno */
314
__attribute__((warn_unused_result))
315
int raise_privileges(void){
316
int old_errno = errno;
317
int ret = 0;
318
if(seteuid(0) == -1){
319
ret = errno;
320
}
321
errno = old_errno;
322
return ret;
323
}
324
325
/* Set effective and real user ID to 0. Return errno. */
326
__attribute__((warn_unused_result))
327
int raise_privileges_permanently(void){
328
int old_errno = errno;
329
int ret = raise_privileges();
330
if(ret != 0){
331
errno = old_errno;
332
return ret;
333
}
334
if(setuid(0) == -1){
335
ret = errno;
336
}
337
errno = old_errno;
338
return ret;
339
}
340
341
/* Set effective user ID to unprivileged saved user ID */
342
__attribute__((warn_unused_result))
343
int lower_privileges(void){
344
int old_errno = errno;
345
int ret = 0;
346
if(seteuid(uid) == -1){
347
ret = errno;
348
}
349
errno = old_errno;
350
return ret;
351
}
352
353
/* Lower privileges permanently */
354
__attribute__((warn_unused_result))
355
int lower_privileges_permanently(void){
356
int old_errno = errno;
357
int ret = 0;
358
if(setuid(uid) == -1){
359
ret = errno;
360
}
361
errno = old_errno;
362
return ret;
363
}
364
245
365
/*
246
366
* Initialize GPGME.
247
367
*/
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
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){
250
373
gpgme_error_t rc;
251
374
gpgme_engine_info_t engine_info;
252
375
253
376
/*
254
377
* Helper function to insert pub and seckey to the engine keyring.
255
378
*/
256
bool import_key(const char *filename){
379
bool import_key(const char * const filename){
257
380
int ret;
258
381
int fd;
259
382
gpgme_data_t pgp_data;
264
387
return false;
265
388
}
266
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
267
439
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
440
if(rc != GPG_ERR_NO_ERROR){
269
441
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
277
449
gpgme_strsource(rc), gpgme_strerror(rc));
278
450
return false;
279
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
}
280
527
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
528
ret = close(fd);
282
529
if(ret == -1){
283
530
perror_plus("close");
284
531
}
323
570
/* Create new GPGME "context" */
324
571
rc = gpgme_new(&(mc->ctx));
325
572
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
329
575
return false;
330
576
}
331
577
340
586
* Decrypt OpenPGP data.
341
587
* Returns -1 on error
342
588
*/
589
__attribute__((nonnull, warn_unused_result))
343
590
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
591
size_t crypto_size,
345
592
char **plaintext,
366
613
/* Create new empty GPGME data buffer for the plaintext */
367
614
rc = gpgme_data_new(&dh_plain);
368
615
if(rc != GPG_ERR_NO_ERROR){
369
fprintf_plus(stderr, "Mandos plugin mandos-client: "
370
"bad gpgme_data_new: %s: %s\n",
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
371
617
gpgme_strsource(rc), gpgme_strerror(rc));
372
618
gpgme_data_release(dh_crypto);
373
619
return -1;
386
632
if(result == NULL){
387
633
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
388
634
} else {
389
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
390
result->unsupported_algorithm);
391
fprintf_plus(stderr, "Wrong key usage: %u\n",
392
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");
393
641
if(result->file_name != NULL){
394
642
fprintf_plus(stderr, "File name: %s\n", result->file_name);
395
643
}
396
gpgme_recipient_t recipient;
397
recipient = result->recipients;
398
while(recipient != NULL){
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
399
647
fprintf_plus(stderr, "Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name
401
(recipient->pubkey_algo));
402
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);
403
650
fprintf_plus(stderr, "Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
recipient = recipient->next;
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
407
652
}
408
653
}
409
654
}
465
710
return plaintext_length;
466
711
}
467
712
468
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){
469
722
const char *ret = gnutls_strerror(value);
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
723
return safe_string(ret);
473
724
}
474
725
475
726
/* GnuTLS log function callback */
727
__attribute__((nonnull))
476
728
static void debuggnutls(__attribute__((unused)) int level,
477
729
const char* string){
478
730
fprintf_plus(stderr, "GnuTLS: %s", string);
479
731
}
480
732
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
481
734
static int init_gnutls_global(const char *pubkeyfilename,
482
735
const char *seckeyfilename,
736
const char *dhparamsfilename,
483
737
mandos_context *mc){
484
738
int ret;
485
739
487
741
fprintf_plus(stderr, "Initializing GnuTLS\n");
488
742
}
489
743
490
ret = gnutls_global_init();
491
if(ret != GNUTLS_E_SUCCESS){
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
494
return -1;
495
}
496
497
744
if(debug){
498
745
/* "Use a log level over 10 to enable all debugging options."
499
746
* - GnuTLS manual
507
754
if(ret != GNUTLS_E_SUCCESS){
508
755
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
756
safer_gnutls_strerror(ret));
510
gnutls_global_deinit();
511
757
return -1;
512
758
}
513
759
514
760
if(debug){
515
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
516
" 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",
517
763
pubkeyfilename,
518
764
seckeyfilename);
519
765
}
520
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
521
780
ret = gnutls_certificate_set_openpgp_key_file
522
781
(mc->cred, pubkeyfilename, seckeyfilename,
523
782
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
524
786
if(ret != GNUTLS_E_SUCCESS){
525
787
fprintf_plus(stderr,
526
"Error[%d] while reading the OpenPGP key pair ('%s',"
788
"Error[%d] while reading the key pair ('%s',"
527
789
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
528
790
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
529
791
safer_gnutls_strerror(ret));
538
800
safer_gnutls_strerror(ret));
539
801
goto globalfail;
540
802
}
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
545
goto globalfail;
546
}
547
548
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
}
549
985
550
986
return 0;
551
987
552
988
globalfail:
553
989
554
990
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_global_deinit();
556
991
gnutls_dh_params_deinit(mc->dh_params);
557
992
return -1;
558
993
}
559
994
995
__attribute__((nonnull, warn_unused_result))
560
996
static int init_gnutls_session(gnutls_session_t *session,
561
997
mandos_context *mc){
562
998
int ret;
563
999
/* GnuTLS session creation */
564
1000
do {
565
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
));
566
1009
if(quit_now){
567
1010
return -1;
568
1011
}
609
1052
/* ignore client certificate if any. */
610
1053
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
1054
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
613
614
1055
return 0;
615
1056
}
616
1057
618
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
1060
__attribute__((unused)) const char *txt){}
620
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
621
1235
/* Called when a Mandos server is found */
1236
__attribute__((nonnull, warn_unused_result))
622
1237
static int start_mandos_communication(const char *ip, in_port_t port,
623
1238
AvahiIfIndex if_index,
624
1239
int af, mandos_context *mc){
625
1240
int ret, tcp_sd = -1;
626
1241
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1242
struct sockaddr_storage to;
631
1243
char *buffer = NULL;
632
1244
char *decrypted_buffer = NULL;
633
1245
size_t buffer_length = 0;
636
1248
int retval = -1;
637
1249
gnutls_session_t session;
638
1250
int pf; /* Protocol family */
1251
bool route_added = false;
639
1252
640
1253
errno = 0;
641
1254
657
1270
return -1;
658
1271
}
659
1272
1273
/* If the interface is specified and we have a list of interfaces */
1274
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1275
/* Check if the interface is one of the interfaces we are using */
1276
bool match = false;
1277
{
1278
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
1282
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
match = true;
1284
break;
1285
}
1286
}
1287
}
1288
if(not match){
1289
/* This interface does not match any in the list, so we don't
1290
connect to the server */
1291
if(debug){
1292
char interface[IF_NAMESIZE];
1293
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1294
perror_plus("if_indextoname");
1295
} else {
1296
fprintf_plus(stderr, "Skipping server on non-used interface"
1297
" \"%s\"\n",
1298
if_indextoname((unsigned int)if_index,
1299
interface));
1300
}
1301
}
1302
return -1;
1303
}
1304
}
1305
660
1306
ret = init_gnutls_session(&session, mc);
661
1307
if(ret != 0){
662
1308
return -1;
667
1313
PRIuMAX "\n", ip, (uintmax_t)port);
668
1314
}
669
1315
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1317
if(tcp_sd < 0){
672
1318
int e = errno;
673
1319
perror_plus("socket");
680
1326
goto mandos_end;
681
1327
}
682
1328
683
memset(&to, 0, sizeof(to));
684
1329
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
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);
687
1333
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
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);
690
1337
}
691
1338
if(ret < 0 ){
692
1339
int e = errno;
701
1348
goto mandos_end;
702
1349
}
703
1350
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
1351
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1352
if(IN6_IS_ADDR_LINKLOCAL
1353
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1354
if(if_index == AVAHI_IF_UNSPEC){
709
1355
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1356
" incomplete without a network interface\n");
712
1358
goto mandos_end;
713
1359
}
714
1360
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1361
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1362
}
717
1363
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1364
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1365
}
722
1366
723
1367
if(quit_now){
740
1384
}
741
1385
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1386
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
757
}
758
}
759
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
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;
782
1467
}
783
1468
784
1469
const char *out = mandos_protocol_version;
938
1623
&decrypted_buffer, mc);
939
1624
if(decrypted_buffer_size >= 0){
940
1625
1626
clearerr(stdout);
941
1627
written = 0;
942
1628
while(written < (size_t) decrypted_buffer_size){
943
1629
if(quit_now){
959
1645
}
960
1646
written += (size_t)ret;
961
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
}
962
1658
retval = 0;
963
1659
}
964
1660
}
967
1663
968
1664
mandos_end:
969
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
}
970
1672
int e = errno;
971
1673
free(decrypted_buffer);
972
1674
free(buffer);
973
1675
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1676
ret = close(tcp_sd);
975
1677
}
976
1678
if(ret == -1){
977
1679
if(e == 0){
1002
1704
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1705
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1706
flags,
1005
void* mc){
1707
void *mc){
1006
1708
if(r == NULL){
1007
1709
return;
1008
1710
}
1011
1713
timed out */
1012
1714
1013
1715
if(quit_now){
1716
avahi_s_service_resolver_free(r);
1014
1717
return;
1015
1718
}
1016
1719
1061
1764
const char *domain,
1062
1765
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1063
1766
flags,
1064
void* mc){
1767
void *mc){
1065
1768
if(b == NULL){
1066
1769
return;
1067
1770
}
1127
1830
errno = old_errno;
1128
1831
}
1129
1832
1833
__attribute__((nonnull, warn_unused_result))
1130
1834
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
1835
int ret;
1132
error_t ret_errno;
1836
int old_errno;
1133
1837
1134
1838
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1135
1839
if(s < 0){
1136
ret_errno = errno;
1840
old_errno = errno;
1137
1841
perror_plus("socket");
1138
errno = ret_errno;
1842
errno = old_errno;
1139
1843
return false;
1140
1844
}
1141
strcpy(ifr->ifr_name, ifname);
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1142
1847
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1143
1848
if(ret == -1){
1144
1849
if(debug){
1145
ret_errno = errno;
1850
old_errno = errno;
1146
1851
perror_plus("ioctl SIOCGIFFLAGS");
1147
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;
1148
1858
}
1149
1859
return false;
1150
1860
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1151
1866
return true;
1152
1867
}
1153
1868
1869
__attribute__((nonnull, warn_unused_result))
1154
1870
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1871
1156
1872
/* Reject the loopback device */
1198
1914
* corresponds to an acceptable network device.
1199
1915
* (This function is passed to scandir(3) as a filter function.)
1200
1916
*/
1917
__attribute__((nonnull, warn_unused_result))
1201
1918
int good_interface(const struct dirent *if_entry){
1202
1919
if(if_entry->d_name[0] == '.'){
1203
1920
return 0;
1221
1938
/*
1222
1939
* This function determines if a network interface is up.
1223
1940
*/
1941
__attribute__((nonnull, warn_unused_result))
1224
1942
bool interface_is_up(const char *interface){
1225
1943
struct ifreq ifr;
1226
1944
if(not get_flags(interface, &ifr)){
1237
1955
/*
1238
1956
* This function determines if a network interface is running
1239
1957
*/
1958
__attribute__((nonnull, warn_unused_result))
1240
1959
bool interface_is_running(const char *interface){
1241
1960
struct ifreq ifr;
1242
1961
if(not get_flags(interface, &ifr)){
1250
1969
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1251
1970
}
1252
1971
1972
__attribute__((nonnull, pure, warn_unused_result))
1253
1973
int notdotentries(const struct dirent *direntry){
1254
1974
/* Skip "." and ".." */
1255
1975
if(direntry->d_name[0] == '.'
1262
1982
}
1263
1983
1264
1984
/* Is this directory entry a runnable program? */
1985
__attribute__((nonnull, warn_unused_result))
1265
1986
int runnable_hook(const struct dirent *direntry){
1266
1987
int ret;
1267
1988
size_t sret;
1275
1996
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
1997
"abcdefghijklmnopqrstuvwxyz"
1277
1998
"0123456789"
1278
"_-");
1999
"_.-");
1279
2000
if((direntry->d_name)[sret] != '\0'){
1280
2001
/* Contains non-allowed characters */
1281
2002
if(debug){
1285
2006
return 0;
1286
2007
}
1287
2008
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1290
if(ret < 0){
1291
perror_plus("asprintf");
1292
return 0;
1293
}
1294
1295
ret = stat(fullname, &st);
2009
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1296
2010
if(ret == -1){
1297
2011
if(debug){
1298
2012
perror_plus("Could not stat hook");
1322
2036
return 1;
1323
2037
}
1324
2038
2039
__attribute__((nonnull, warn_unused_result))
1325
2040
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
2041
mandos_context *mc){
1327
2042
int ret;
1331
2046
1332
2047
while(true){
1333
2048
if(mc->current_server == NULL){
1334
if (debug){
2049
if(debug){
1335
2050
fprintf_plus(stderr, "Wait until first server is found."
1336
2051
" No timeout!\n");
1337
2052
}
1338
2053
ret = avahi_simple_poll_iterate(s, -1);
1339
2054
} else {
1340
if (debug){
2055
if(debug){
1341
2056
fprintf_plus(stderr, "Check current_server if we should run"
1342
2057
" it, or wait\n");
1343
2058
}
1360
2075
- ((intmax_t)waited_time.tv_sec * 1000))
1361
2076
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
2077
1363
if (debug){
2078
if(debug){
1364
2079
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
2080
block_time);
1366
2081
}
1388
2103
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
2104
}
1390
2105
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
2106
if(ret > 0 or errno != EINTR){
1392
2107
return (ret != 1) ? ret : 0;
1393
2108
}
1394
2109
}
1395
2110
}
1396
2111
}
1397
2112
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1403
ret_errno = errno;
1404
perror_plus("seteuid");
1405
}
1406
errno = old_errno;
1407
return ret_errno;
1408
}
1409
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1414
if(ret_errno != 0){
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
if(setuid(0) == -1){
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1421
}
1422
errno = old_errno;
1423
return ret_errno;
1424
}
1425
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1433
}
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1443
ret_errno = errno;
1444
perror_plus("setuid");
1445
}
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
1450
bool run_network_hooks(const char *mode, const char *interface,
2113
__attribute__((nonnull))
2114
void run_network_hooks(const char *mode, const char *interface,
1451
2115
const float delay){
1452
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
}
1453
2144
struct dirent *direntry;
1454
2145
int ret;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
alphasort);
1457
if(numhooks == -1){
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
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);
1465
2151
}
1466
} else {
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1472
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){
1473
2198
perror_plus("asprintf");
1474
continue;
1475
}
1476
if(debug){
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1478
direntry->d_name);
1479
}
1480
pid_t hook_pid = fork();
1481
if(hook_pid == 0){
1482
/* Child */
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1485
/* Set group */
1486
errno = 0;
1487
ret = setgid(0);
1488
if(ret == -1){
1489
perror_plus("setgid");
1490
}
1491
/* Reset supplementary groups */
1492
errno = 0;
1493
ret = setgroups(0, NULL);
1494
if(ret == -1){
1495
perror_plus("setgroups");
1496
}
1497
dup2(devnull, STDIN_FILENO);
1498
close(devnull);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("DEVICE", interface, 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
ret = setenv("MODE", mode, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
char *delaystring;
1521
ret = asprintf(&delaystring, "%f", delay);
1522
if(ret == -1){
1523
perror_plus("asprintf");
1524
_exit(EX_OSERR);
1525
}
1526
ret = setenv("DELAY", delaystring, 1);
1527
if(ret == -1){
1528
free(delaystring);
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
2199
_exit(EX_OSERR);
2200
}
2201
ret = setenv("DELAY", delaystring, 1);
2202
if(ret == -1){
1532
2203
free(delaystring);
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
}
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1543
}
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;
1544
2272
} else {
1545
int status;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1548
free(fullname);
1549
continue;
1550
}
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1556
free(fullname);
1557
continue;
1558
}
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1562
WTERMSIG(status));
1563
free(fullname);
1564
continue;
1565
} else {
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1568
free(fullname);
1569
continue;
1570
}
1571
}
1572
free(fullname);
1573
if(debug){
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1575
direntry->d_name);
1576
}
1577
}
1578
close(devnull);
1579
}
1580
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);
1581
2292
}
1582
2293
1583
error_t bring_up_interface(const char *const interface,
1584
const float delay){
1585
int sd = -1;
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
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;
1589
2299
struct ifreq network;
1590
2300
unsigned int if_index = if_nametoindex(interface);
1591
2301
if(if_index == 0){
1600
2310
}
1601
2311
1602
2312
if(not interface_is_up(interface)){
1603
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)){
1604
2316
ret_errno = errno;
1605
2317
fprintf_plus(stderr, "Failed to get flags for interface "
1606
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
1607
2320
return ret_errno;
1608
2321
}
1609
network.ifr_flags |= IFF_UP;
2322
network.ifr_flags |= IFF_UP; /* set flag */
1610
2323
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
1613
2326
ret_errno = errno;
1614
2327
perror_plus("socket");
1615
2328
errno = old_errno;
1616
2329
return ret_errno;
1617
2330
}
1618
2331
1619
2332
if(quit_now){
1620
close(sd);
2333
ret = close(sd);
2334
if(ret == -1){
2335
perror_plus("close");
2336
}
1621
2337
errno = old_errno;
1622
2338
return EINTR;
1623
2339
}
1627
2343
interface);
1628
2344
}
1629
2345
1630
/* Raise priviliges */
1631
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
}
1632
2352
1633
2353
#ifdef __linux__
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
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
}
1641
2365
}
1642
2366
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
2367
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2368
ioctl_errno = errno;
1645
2369
#ifdef __linux__
1646
2370
if(restore_loglevel){
1647
2371
ret_linux = klogctl(7, NULL, 0);
1651
2375
}
1652
2376
#endif /* __linux__ */
1653
2377
1654
/* Lower privileges */
1655
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
}
1656
2387
1657
2388
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2389
ret = close(sd);
1659
2390
if(ret == -1){
1660
2391
perror_plus("close");
1661
2392
}
1662
2393
1663
2394
if(ret_setflags == -1){
1664
errno = ret_errno;
2395
errno = ioctl_errno;
1665
2396
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
2397
errno = old_errno;
1667
return ret_errno;
2398
return ioctl_errno;
1668
2399
}
1669
2400
} else if(debug){
1670
2401
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1673
2404
1674
2405
/* Sleep checking until interface is running.
1675
2406
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
2407
for(int i = 0; i < delay * 4; i++){
1677
2408
if(interface_is_running(interface)){
1678
2409
break;
1679
2410
}
1688
2419
return 0;
1689
2420
}
1690
2421
1691
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
2422
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
1696
2425
struct ifreq network;
1697
2426
unsigned int if_index = if_nametoindex(interface);
1698
2427
if(if_index == 0){
1701
2430
return ENXIO;
1702
2431
}
1703
2432
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
1704
2435
if(not get_flags(interface, &network) and debug){
1705
2436
ret_errno = errno;
1706
2437
fprintf_plus(stderr, "Failed to get flags for interface "
1707
2438
"\"%s\"\n", interface);
2439
errno = old_errno;
1708
2440
return ret_errno;
1709
2441
}
1710
2442
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
2443
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
2444
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2445
if(sd == -1){
1714
2446
ret_errno = errno;
1715
2447
perror_plus("socket");
1716
2448
errno = old_errno;
1722
2454
interface);
1723
2455
}
1724
2456
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
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
}
1733
2476
1734
2477
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2478
int ret = close(sd);
1736
2479
if(ret == -1){
1737
2480
perror_plus("close");
1738
2481
}
1739
2482
1740
2483
if(ret_setflags == -1){
1741
errno = ret_errno;
2484
errno = ioctl_errno;
1742
2485
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
2486
errno = old_errno;
1744
return ret_errno;
2487
return ioctl_errno;
1745
2488
}
1746
2489
} else if(debug){
1747
2490
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1753
2496
}
1754
2497
1755
2498
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
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 };
1759
2512
AvahiSServiceBrowser *sb = NULL;
1760
2513
error_t ret_errno;
1761
2514
int ret;
1762
2515
intmax_t tmpmax;
1763
2516
char *tmp;
1764
2517
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
2518
char *interfaces_to_take_down = NULL;
1768
2519
size_t interfaces_to_take_down_size = 0;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
2520
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2521
char old_tempdir[] = "/tmp/mandosXXXXXX";
2522
char *tempdir = NULL;
1771
2523
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
2524
const char *seckey = PATHDIR "/" SECKEY;
1773
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;
1774
2531
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1776
2532
1777
2533
bool gnutls_initialized = false;
1778
2534
bool gpgme_initialized = false;
1824
2580
{ .name = "pubkey", .key = 'p',
1825
2581
.arg = "FILE",
1826
2582
.doc = "OpenPGP public key file base name",
1827
.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 },
1828
2600
{ .name = "dh-bits", .key = 129,
1829
2601
.arg = "BITS",
1830
2602
.doc = "Bit length of the prime number used in the"
1831
2603
" Diffie-Hellman key exchange",
1832
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 },
1833
2610
{ .name = "priority", .key = 130,
1834
2611
.arg = "STRING",
1835
2612
.doc = "GnuTLS priority string for the TLS handshake",
1869
2646
connect_to = arg;
1870
2647
break;
1871
2648
case 'i': /* --interface */
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
2649
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2650
arg, (int)',');
1874
2651
if(ret_errno != 0){
1875
2652
argp_error(state, "%s", strerror(ret_errno));
1876
2653
}
1881
2658
case 'p': /* --pubkey */
1882
2659
pubkey = arg;
1883
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;
1884
2671
case 129: /* --dh-bits */
1885
2672
errno = 0;
1886
2673
tmpmax = strtoimax(arg, &tmp, 10);
1890
2677
}
1891
2678
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1892
2679
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
1893
2683
case 130: /* --priority */
1894
2684
mc.priority = arg;
1895
2685
break;
1918
2708
argp_state_help(state, state->out_stream,
1919
2709
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1920
2710
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
1921
2712
case -3: /* --usage */
1922
2713
argp_state_help(state, state->out_stream,
1923
2714
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
1924
2716
case 'V': /* --version */
1925
2717
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1926
2718
exit(argp_err_exit_status);
1935
2727
.args_doc = "",
1936
2728
.doc = "Mandos client -- Get and decrypt"
1937
2729
" passwords from a Mandos server" };
1938
ret = argp_parse(&argp, argc, argv,
1939
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1940
switch(ret){
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
1941
2733
case 0:
1942
2734
break;
1943
2735
case ENOMEM:
1944
2736
default:
1945
errno = ret;
2737
errno = ret_errno;
1946
2738
perror_plus("argp_parse");
1947
2739
exitcode = EX_OSERR;
1948
2740
goto end;
1951
2743
goto end;
1952
2744
}
1953
2745
}
1954
2746
1955
2747
{
1956
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
1958
1959
/* Re-raise priviliges */
1960
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 {
1961
2754
struct stat st;
1962
2755
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
1963
2759
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1964
2760
int seckey_fd = open(seckey, O_RDONLY);
1965
2761
if(seckey_fd == -1){
1977
2773
}
1978
2774
}
1979
2775
}
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
2776
close(seckey_fd);
1981
2777
}
1982
2778
}
1983
2779
1984
2780
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
2781
int pubkey_fd = open(pubkey, O_RDONLY);
1986
2782
if(pubkey_fd == -1){
1998
2794
}
1999
2795
}
2000
2796
}
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2002
}
2003
}
2004
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
2005
2832
/* Lower privileges */
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2836
perror_plus("Failed to lower privileges");
2010
2837
}
2011
2838
}
2012
2839
}
2013
2840
2014
/* Remove empty interface names */
2841
/* Remove invalid interface names (except "none") */
2015
2842
{
2016
2843
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2844
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2018
2845
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2846
if(strcmp(interface, "none") != 0
2847
and if_nametoindex(interface) == 0){
2848
if(interface[0] != '\0'){
2021
2849
fprintf_plus(stderr, "Not using nonexisting interface"
2022
2850
" \"%s\"\n", interface);
2023
2851
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2852
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2025
2853
interface = NULL;
2026
2854
}
2027
2855
}
2029
2857
2030
2858
/* Run network hooks */
2031
2859
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2860
if(mc.interfaces != NULL){
2861
interfaces_hooks = malloc(mc.interfaces_size);
2035
2862
if(interfaces_hooks == NULL){
2036
2863
perror_plus("malloc");
2037
2864
goto end;
2038
2865
}
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
2866
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2867
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2868
}
2869
run_network_hooks("start", interfaces_hooks != NULL ?
2870
interfaces_hooks : "", delay);
2048
2871
}
2049
2872
2050
2873
if(not debug){
2127
2950
}
2128
2951
2129
2952
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2953
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2132
2955
/* Look for any good interfaces */
2133
2956
ret = scandir(sys_class_net, &direntries, good_interface,
2134
2957
alphasort);
2135
2958
if(ret >= 1){
2136
2959
/* Add all found interfaces to interfaces list */
2137
2960
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2961
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2139
2962
direntries[i]->d_name);
2140
2963
if(ret_errno != 0){
2964
errno = ret_errno;
2141
2965
perror_plus("argz_add");
2966
free(direntries[i]);
2142
2967
continue;
2143
2968
}
2144
2969
if(debug){
2145
2970
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
2971
direntries[i]->d_name);
2147
2972
}
2973
free(direntries[i]);
2148
2974
}
2149
2975
free(direntries);
2150
2976
} else {
2151
free(direntries);
2977
if(ret == 0){
2978
free(direntries);
2979
}
2152
2980
fprintf_plus(stderr, "Could not find a network interface\n");
2153
2981
exitcode = EXIT_FAILURE;
2154
2982
goto end;
2155
2983
}
2156
2984
}
2157
2985
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2986
/* Bring up interfaces which are down, and remove any "none"s */
2987
{
2170
2988
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2989
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2172
2990
interface))){
2991
/* If interface name is "none", stop bringing up interfaces.
2992
Also remove all instances of "none" from the list */
2993
if(strcmp(interface, "none") == 0){
2994
argz_delete(&mc.interfaces, &mc.interfaces_size,
2995
interface);
2996
interface = NULL;
2997
while((interface = argz_next(mc.interfaces,
2998
mc.interfaces_size, interface))){
2999
if(strcmp(interface, "none") == 0){
3000
argz_delete(&mc.interfaces, &mc.interfaces_size,
3001
interface);
3002
interface = NULL;
3003
}
3004
}
3005
break;
3006
}
2173
3007
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
3008
errno = bring_up_interface(interface, delay);
2175
3009
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2178
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));
2179
3013
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
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
}
2183
3020
}
2184
3021
}
2185
3022
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
3023
if(debug and (interfaces_to_take_down == NULL)){
2190
3024
fprintf_plus(stderr, "No interfaces were brought up\n");
2191
3025
}
2192
3026
}
2193
3027
3028
/* If we only got one interface, explicitly use only that one */
3029
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
3030
if(debug){
3031
fprintf_plus(stderr, "Using only interface \"%s\"\n",
3032
mc.interfaces);
3033
}
3034
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
3035
}
3036
2194
3037
if(quit_now){
2195
3038
goto end;
2196
3039
}
2197
3040
2198
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
2199
3048
if(ret == -1){
2200
3049
fprintf_plus(stderr, "init_gnutls_global failed\n");
2201
3050
exitcode = EX_UNAVAILABLE;
2208
3057
goto end;
2209
3058
}
2210
3059
2211
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){
2212
3070
perror_plus("mkdtemp");
2213
3071
goto end;
2214
3072
}
2215
tempdir_created = true;
2216
3073
2217
3074
if(quit_now){
2218
3075
goto end;
2254
3111
exitcode = EX_USAGE;
2255
3112
goto end;
2256
3113
}
2257
3114
2258
3115
if(quit_now){
2259
3116
goto end;
2260
3117
}
2290
3147
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
3148
(int)retry_interval);
2292
3149
}
2293
sleep((int)retry_interval);
3150
sleep((unsigned int)retry_interval);
2294
3151
}
2295
3152
2296
if (not quit_now){
3153
if(not quit_now){
2297
3154
exitcode = EXIT_SUCCESS;
2298
3155
}
2299
3156
2315
3172
2316
3173
/* Allocate a new server */
2317
3174
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
3175
&config, NULL, NULL, &ret);
2319
3176
2320
3177
/* Free the Avahi configuration data */
2321
3178
avahi_server_config_free(&config);
2324
3181
/* Check if creating the Avahi server object succeeded */
2325
3182
if(mc.server == NULL){
2326
3183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
3184
avahi_strerror(ret));
2328
3185
exitcode = EX_UNAVAILABLE;
2329
3186
goto end;
2330
3187
}
2354
3211
if(debug){
2355
3212
fprintf_plus(stderr, "Starting Avahi loop search\n");
2356
3213
}
2357
3214
2358
3215
ret = avahi_loop_with_timeout(simple_poll,
2359
3216
(int)(retry_interval * 1000), &mc);
2360
3217
if(debug){
2365
3222
end:
2366
3223
2367
3224
if(debug){
2368
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
}
2369
3232
}
2370
3233
2371
3234
/* Cleanup things */
3235
free(mc.interfaces);
3236
2372
3237
if(sb != NULL)
2373
3238
avahi_s_service_browser_free(sb);
2374
3239
2380
3245
2381
3246
if(gnutls_initialized){
2382
3247
gnutls_certificate_free_credentials(mc.cred);
2383
gnutls_global_deinit();
2384
3248
gnutls_dh_params_deinit(mc.dh_params);
2385
3249
}
2386
3250
2394
3258
mc.current_server->prev->next = NULL;
2395
3259
while(mc.current_server != NULL){
2396
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
2397
3269
free(mc.current_server);
2398
3270
mc.current_server = next;
2399
3271
}
2400
3272
}
2401
3273
2402
/* Re-raise priviliges */
3274
/* Re-raise privileges */
2403
3275
{
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
perror_plus("Failed to take down interface");
2420
}
2421
}
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
2425
}
2426
}
2427
2428
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
}
2429
3310
}
2430
3311
2431
3312
free(interfaces_to_take_down);
2432
3313
free(interfaces_hooks);
2433
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
2434
3369
/* Removes the GPGME temp directory and all files inside */
2435
if(tempdir_created){
2436
struct dirent **direntries = NULL;
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
2442
direntry = direntries[i];
2443
char *fullname = NULL;
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
2445
direntry->d_name);
2446
if(ret < 0){
2447
perror_plus("asprintf");
2448
continue;
2449
}
2450
ret = remove(fullname);
2451
if(ret == -1){
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
2454
}
2455
free(fullname);
2456
}
2457
}
2458
2459
/* need to clean even if 0 because man page doesn't specify */
2460
free(direntries);
2461
if (numentries == -1){
2462
perror_plus("scandir");
2463
}
2464
ret = rmdir(tempdir);
2465
if(ret == -1 and errno != ENOENT){
2466
perror_plus("rmdir");
2467
}
3370
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
2468
3372
}
2469
3373
2470
3374
if(quit_now){
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Version: 2.0.2.dev0