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- Committer: Teddy Hogeborn
- Date: 2011-11-27 02:32:20 UTC
- mto: (505.2.10 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111127023220-bih6el7s0q6jhtci
* debian/mandos-client.README.Debian: Document network hook facility.
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
- files removed:
- bugs.xml
- debian/upstream
- plugin-helpers
- 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 © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 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
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
87
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argp_state, struct argp,
94
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
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WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
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#ifdef __linux__
106
92
#include <sys/klog.h> /* klogctl() */
148
134
static const char sys_class_net[] = "/sys/class/net";
149
135
char *connect_to = NULL;
150
136
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
137
155
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/* Doubly linked list that need to be circularly linked when used */
156
139
typedef struct server{
157
140
const char *ip;
158
in_port_t port;
141
uint16_t port;
159
142
AvahiIfIndex if_index;
160
143
int af;
161
144
struct timespec last_seen;
165
148
166
149
/* Used for passing in values through the Avahi callback functions */
167
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
168
152
AvahiServer *server;
169
153
gnutls_certificate_credentials_t cred;
170
154
unsigned int dh_bits;
172
156
const char *priority;
173
157
gpgme_ctx_t ctx;
174
158
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
159
} mandos_context;
178
160
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
181
166
182
167
sig_atomic_t quit_now = 0;
183
168
int signal_received = 0;
184
169
185
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/* Function to use when printing errors */
186
171
void perror_plus(const char *print_text){
187
int e = errno;
188
172
fprintf(stderr, "Mandos plugin %s: ",
189
173
program_invocation_short_name);
190
errno = e;
191
174
perror(print_text);
192
175
}
193
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194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
177
int fprintf_plus(FILE *stream, const char *format, ...){
196
178
va_list ap;
197
179
va_start (ap, format);
198
180
199
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
182
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
184
}
203
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204
186
/*
206
188
* bytes. "buffer_capacity" is how much is currently allocated,
207
189
* "buffer_length" is how much is already used.
208
190
*/
209
__attribute__((nonnull, warn_unused_result))
210
191
size_t incbuffer(char **buffer, size_t buffer_length,
211
192
size_t buffer_capacity){
212
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
219
196
return 0;
220
197
}
221
*buffer = new_buf;
222
198
buffer_capacity += BUFFER_SIZE;
223
199
}
224
200
return buffer_capacity;
225
201
}
226
202
227
203
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
231
206
int ret;
232
207
server *new_server = malloc(sizeof(server));
233
208
if(new_server == NULL){
234
209
perror_plus("malloc");
235
return false;
210
return -1;
236
211
}
237
212
*new_server = (server){ .ip = strdup(ip),
238
213
.port = port,
240
215
.af = af };
241
216
if(new_server->ip == NULL){
242
217
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
218
return -1;
259
219
}
260
220
/* Special case of first server */
261
if(*current_server == NULL){
221
if (mc.current_server == NULL){
262
222
new_server->next = new_server;
263
223
new_server->prev = new_server;
264
*current_server = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
265
226
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
269
229
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
273
238
}
274
239
275
240
/*
276
241
* Initialize GPGME.
277
242
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
283
245
gpgme_error_t rc;
284
246
gpgme_engine_info_t engine_info;
285
247
248
286
249
/*
287
250
* Helper function to insert pub and seckey to the engine keyring.
288
251
*/
289
bool import_key(const char * const filename){
252
bool import_key(const char *filename){
290
253
int ret;
291
254
int fd;
292
255
gpgme_data_t pgp_data;
304
267
return false;
305
268
}
306
269
307
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
308
271
if(rc != GPG_ERR_NO_ERROR){
309
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
273
gpgme_strsource(rc), gpgme_strerror(rc));
311
274
return false;
312
275
}
313
{
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
320
fprintf_plus(stderr,
321
"The total number of considered keys: %d\n",
322
import_result->considered);
323
fprintf_plus(stderr,
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
326
fprintf_plus(stderr,
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
341
fprintf_plus(stderr,
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
344
fprintf_plus(stderr,
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
347
fprintf_plus(stderr,
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
357
import_status->fpr);
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
362
}
363
fprintf_plus(stderr, "Key status:\n");
364
fprintf_plus(stderr,
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
368
fprintf_plus(stderr,
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
372
fprintf_plus(stderr,
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
376
fprintf_plus(stderr,
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
380
fprintf_plus(stderr,
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
384
}
385
return false;
386
}
387
}
388
276
389
ret = close(fd);
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
390
278
if(ret == -1){
391
279
perror_plus("close");
392
280
}
429
317
}
430
318
431
319
/* Create new GPGME "context" */
432
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
433
321
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
324
gpgme_strerror(rc));
436
325
return false;
437
326
}
438
327
447
336
* Decrypt OpenPGP data.
448
337
* Returns -1 on error
449
338
*/
450
__attribute__((nonnull, warn_unused_result))
451
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
452
340
size_t crypto_size,
453
char **plaintext,
454
mandos_context *mc){
341
char **plaintext){
455
342
gpgme_data_t dh_crypto, dh_plain;
456
343
gpgme_error_t rc;
457
344
ssize_t ret;
474
361
/* Create new empty GPGME data buffer for the plaintext */
475
362
rc = gpgme_data_new(&dh_plain);
476
363
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
478
366
gpgme_strsource(rc), gpgme_strerror(rc));
479
367
gpgme_data_release(dh_crypto);
480
368
return -1;
482
370
483
371
/* Decrypt data from the cryptotext data buffer to the plaintext
484
372
data buffer */
485
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
486
374
if(rc != GPG_ERR_NO_ERROR){
487
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
488
376
gpgme_strsource(rc), gpgme_strerror(rc));
489
377
plaintext_length = -1;
490
378
if(debug){
491
379
gpgme_decrypt_result_t result;
492
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
493
381
if(result == NULL){
494
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
495
383
} else {
496
if(result->unsupported_algorithm != NULL) {
497
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
498
result->unsupported_algorithm);
499
}
500
fprintf_plus(stderr, "Wrong key usage: %s\n",
501
result->wrong_key_usage ? "Yes" : "No");
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
502
388
if(result->file_name != NULL){
503
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
504
390
}
574
460
return plaintext_length;
575
461
}
576
462
577
__attribute__((warn_unused_result, const))
578
static const char *safe_string(const char *str){
579
if(str == NULL)
580
return "(unknown)";
581
return str;
582
}
583
584
__attribute__((warn_unused_result))
585
static const char *safer_gnutls_strerror(int value){
586
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
466
if(ret == NULL)
467
ret = "(unknown)";
468
return ret;
588
469
}
589
470
590
471
/* GnuTLS log function callback */
591
__attribute__((nonnull))
592
472
static void debuggnutls(__attribute__((unused)) int level,
593
473
const char* string){
594
474
fprintf_plus(stderr, "GnuTLS: %s", string);
595
475
}
596
476
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
598
477
static int init_gnutls_global(const char *pubkeyfilename,
599
const char *seckeyfilename,
600
const char *dhparamsfilename,
601
mandos_context *mc){
478
const char *seckeyfilename){
602
479
int ret;
603
unsigned int uret;
604
480
605
481
if(debug){
606
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
607
483
}
608
484
485
ret = gnutls_global_init();
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
489
return -1;
490
}
491
609
492
if(debug){
610
493
/* "Use a log level over 10 to enable all debugging options."
611
494
* - GnuTLS manual
615
498
}
616
499
617
500
/* OpenPGP credentials */
618
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
619
502
if(ret != GNUTLS_E_SUCCESS){
620
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
621
504
safer_gnutls_strerror(ret));
505
gnutls_global_deinit();
622
506
return -1;
623
507
}
624
508
630
514
}
631
515
632
516
ret = gnutls_certificate_set_openpgp_key_file
633
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
634
518
GNUTLS_OPENPGP_FMT_BASE64);
635
519
if(ret != GNUTLS_E_SUCCESS){
636
520
fprintf_plus(stderr,
642
526
}
643
527
644
528
/* GnuTLS server initialization */
645
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
646
530
if(ret != GNUTLS_E_SUCCESS){
647
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
648
532
" initialization: %s\n",
649
533
safer_gnutls_strerror(ret));
650
534
goto globalfail;
651
535
}
652
/* If a Diffie-Hellman parameters file was given, try to use it */
653
if(dhparamsfilename != NULL){
654
gnutls_datum_t params = { .data = NULL, .size = 0 };
655
do {
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
657
if(dhpfile == -1){
658
perror_plus("open");
659
dhparamsfilename = NULL;
660
break;
661
}
662
size_t params_capacity = 0;
663
while(true){
664
params_capacity = incbuffer((char **)¶ms.data,
665
(size_t)params.size,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
669
free(params.data);
670
params.data = NULL;
671
dhparamsfilename = NULL;
672
break;
673
}
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
676
BUFFER_SIZE);
677
/* EOF */
678
if(bytes_read == 0){
679
break;
680
}
681
/* check bytes_read for failure */
682
if(bytes_read < 0){
683
perror_plus("read");
684
free(params.data);
685
params.data = NULL;
686
dhparamsfilename = NULL;
687
break;
688
}
689
params.size += (unsigned int)bytes_read;
690
}
691
ret = close(dhpfile);
692
if(ret == -1){
693
perror_plus("close");
694
}
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
697
}
698
if(dhparamsfilename == NULL){
699
break;
700
}
701
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
702
GNUTLS_X509_FMT_PEM);
703
if(ret != GNUTLS_E_SUCCESS){
704
fprintf_plus(stderr, "Failed to parse DH parameters in file"
705
" \"%s\": %s\n", dhparamsfilename,
706
safer_gnutls_strerror(ret));
707
dhparamsfilename = NULL;
708
}
709
free(params.data);
710
} while(false);
711
}
712
if(dhparamsfilename == NULL){
713
if(mc->dh_bits == 0){
714
/* Find out the optimal number of DH bits */
715
/* Try to read the private key file */
716
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
717
do {
718
int secfile = open(seckeyfilename, O_RDONLY);
719
if(secfile == -1){
720
perror_plus("open");
721
break;
722
}
723
size_t buffer_capacity = 0;
724
while(true){
725
buffer_capacity = incbuffer((char **)&buffer.data,
726
(size_t)buffer.size,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
730
free(buffer.data);
731
buffer.data = NULL;
732
break;
733
}
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
736
BUFFER_SIZE);
737
/* EOF */
738
if(bytes_read == 0){
739
break;
740
}
741
/* check bytes_read for failure */
742
if(bytes_read < 0){
743
perror_plus("read");
744
free(buffer.data);
745
buffer.data = NULL;
746
break;
747
}
748
buffer.size += (unsigned int)bytes_read;
749
}
750
close(secfile);
751
} while(false);
752
/* If successful, use buffer to parse private key */
753
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
754
if(buffer.data != NULL){
755
{
756
gnutls_openpgp_privkey_t privkey = NULL;
757
ret = gnutls_openpgp_privkey_init(&privkey);
758
if(ret != GNUTLS_E_SUCCESS){
759
fprintf_plus(stderr, "Error initializing OpenPGP key"
760
" structure: %s",
761
safer_gnutls_strerror(ret));
762
free(buffer.data);
763
buffer.data = NULL;
764
} else {
765
ret = gnutls_openpgp_privkey_import
766
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
769
safer_gnutls_strerror(ret));
770
privkey = NULL;
771
}
772
free(buffer.data);
773
buffer.data = NULL;
774
if(privkey != NULL){
775
/* Use private key to suggest an appropriate
776
sec_param */
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
779
if(debug){
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
783
(sec_param)));
784
}
785
}
786
}
787
}
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
791
if(debug){
792
fprintf_plus(stderr, "Falling back to security parameter"
793
" \"%s\"\n",
794
safe_string(gnutls_sec_param_get_name
795
(sec_param)));
796
}
797
}
798
}
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
800
if(uret != 0){
801
mc->dh_bits = uret;
802
if(debug){
803
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
804
" implies %u DH bits; using that.\n",
805
safe_string(gnutls_sec_param_get_name
806
(sec_param)),
807
mc->dh_bits);
808
}
809
} else {
810
fprintf_plus(stderr, "Failed to get implied number of DH"
811
" bits for security parameter \"%s\"): %s\n",
812
safe_string(gnutls_sec_param_get_name
813
(sec_param)),
814
safer_gnutls_strerror(ret));
815
goto globalfail;
816
}
817
} else if(debug){
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
819
mc->dh_bits);
820
}
821
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
822
if(ret != GNUTLS_E_SUCCESS){
823
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
824
" bits): %s\n", mc->dh_bits,
825
safer_gnutls_strerror(ret));
826
goto globalfail;
827
}
828
}
829
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
540
goto globalfail;
541
}
542
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
830
544
831
545
return 0;
832
546
833
547
globalfail:
834
548
835
gnutls_certificate_free_credentials(mc->cred);
836
gnutls_dh_params_deinit(mc->dh_params);
549
gnutls_certificate_free_credentials(mc.cred);
550
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
837
552
return -1;
838
553
}
839
554
840
__attribute__((nonnull, warn_unused_result))
841
static int init_gnutls_session(gnutls_session_t *session,
842
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
843
556
int ret;
844
557
/* GnuTLS session creation */
845
558
do {
857
570
{
858
571
const char *err;
859
572
do {
860
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
861
574
if(quit_now){
862
575
gnutls_deinit(*session);
863
576
return -1;
874
587
875
588
do {
876
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
877
mc->cred);
590
mc.cred);
878
591
if(quit_now){
879
592
gnutls_deinit(*session);
880
593
return -1;
890
603
/* ignore client certificate if any. */
891
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
892
605
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
893
608
return 0;
894
609
}
895
610
897
612
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
898
613
__attribute__((unused)) const char *txt){}
899
614
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
904
int ret = 0;
905
if(seteuid(0) == -1){
906
ret = errno;
907
}
908
errno = old_errno;
909
return ret;
910
}
911
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
917
if(ret != 0){
918
errno = old_errno;
919
return ret;
920
}
921
if(setuid(0) == -1){
922
ret = errno;
923
}
924
errno = old_errno;
925
return ret;
926
}
927
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
932
int ret = 0;
933
if(seteuid(uid) == -1){
934
ret = errno;
935
}
936
errno = old_errno;
937
return ret;
938
}
939
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
944
int ret = 0;
945
if(setuid(uid) == -1){
946
ret = errno;
947
}
948
errno = old_errno;
949
return ret;
950
}
951
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
955
const char *address,
956
AvahiIfIndex if_index){
957
int ret;
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
964
if(debug){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
967
}
968
return false;
969
}
970
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
974
return false;
975
}
976
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
978
if(devnull == -1){
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
980
return false;
981
}
982
pid_t pid = fork();
983
if(pid == 0){
984
/* Child */
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
987
if(errno != 0){
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
990
} else {
991
/* Set group */
992
errno = 0;
993
ret = setgid(0);
994
if(ret == -1){
995
perror_plus("setgid");
996
_exit(EX_NOPERM);
997
}
998
/* Reset supplementary groups */
999
errno = 0;
1000
ret = setgroups(0, NULL);
1001
if(ret == -1){
1002
perror_plus("setgroups");
1003
_exit(EX_NOPERM);
1004
}
1005
}
1006
ret = dup2(devnull, STDIN_FILENO);
1007
if(ret == -1){
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1009
_exit(EX_OSERR);
1010
}
1011
ret = close(devnull);
1012
if(ret == -1){
1013
perror_plus("close");
1014
_exit(EX_OSERR);
1015
}
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1017
if(ret == -1){
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1019
_exit(EX_OSERR);
1020
}
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1022
O_RDONLY
1023
| O_DIRECTORY
1024
| O_PATH
1025
| O_CLOEXEC));
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1029
}
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1031
helper, O_RDONLY));
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1036
}
1037
close(helperdir_fd);
1038
#ifdef __GNUC__
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1041
#endif
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1045
environ) == -1){
1046
#ifdef __GNUC__
1047
#pragma GCC diagnostic pop
1048
#endif
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1051
}
1052
}
1053
if(pid == -1){
1054
perror_plus("fork");
1055
return false;
1056
}
1057
int status;
1058
pid_t pret = -1;
1059
errno = 0;
1060
do {
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1068
}
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1071
}
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1074
" helper program");
1075
}
1076
return false;
1077
}
1078
} while(pret == -1 and errno == EINTR);
1079
if(pret == -1){
1080
perror_plus("waitpid");
1081
return false;
1082
}
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1087
return false;
1088
}
1089
return true;
1090
}
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1094
return false;
1095
}
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1097
return false;
1098
}
1099
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1103
if(debug){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1105
}
1106
return add_delete_local_route(true, address, if_index);
1107
}
1108
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1112
if(debug){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1114
}
1115
return add_delete_local_route(false, address, if_index);
1116
}
1117
1118
615
/* Called when a Mandos server is found */
1119
__attribute__((nonnull, warn_unused_result))
1120
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
1121
617
AvahiIfIndex if_index,
1122
int af, mandos_context *mc){
618
int af){
1123
619
int ret, tcp_sd = -1;
1124
620
ssize_t sret;
1125
struct sockaddr_storage to;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
1126
625
char *buffer = NULL;
1127
626
char *decrypted_buffer = NULL;
1128
627
size_t buffer_length = 0;
1131
630
int retval = -1;
1132
631
gnutls_session_t session;
1133
632
int pf; /* Protocol family */
1134
bool route_added = false;
1135
633
1136
634
errno = 0;
1137
635
1153
651
return -1;
1154
652
}
1155
653
1156
/* If the interface is specified and we have a list of interfaces */
1157
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1158
/* Check if the interface is one of the interfaces we are using */
1159
bool match = false;
1160
{
1161
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
1165
if(if_nametoindex(interface) == (unsigned int)if_index){
1166
match = true;
1167
break;
1168
}
1169
}
1170
}
1171
if(not match){
1172
/* This interface does not match any in the list, so we don't
1173
connect to the server */
1174
if(debug){
1175
char interface[IF_NAMESIZE];
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
1178
} else {
1179
fprintf_plus(stderr, "Skipping server on non-used interface"
1180
" \"%s\"\n",
1181
if_indextoname((unsigned int)if_index,
1182
interface));
1183
}
1184
}
1185
return -1;
1186
}
1187
}
1188
1189
ret = init_gnutls_session(&session, mc);
654
ret = init_gnutls_session(&session);
1190
655
if(ret != 0){
1191
656
return -1;
1192
657
}
1193
658
1194
659
if(debug){
1195
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1196
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
1197
662
}
1198
663
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
1200
665
if(tcp_sd < 0){
1201
666
int e = errno;
1202
667
perror_plus("socket");
1209
674
goto mandos_end;
1210
675
}
1211
676
677
memset(&to, 0, sizeof(to));
1212
678
if(af == AF_INET6){
1213
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1214
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1215
ret = inet_pton(af, ip, &to6->sin6_addr);
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1216
681
} else { /* IPv4 */
1217
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1218
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1219
ret = inet_pton(af, ip, &to4->sin_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
1220
684
}
1221
685
if(ret < 0 ){
1222
686
int e = errno;
1231
695
goto mandos_end;
1232
696
}
1233
697
if(af == AF_INET6){
1234
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1235
if(IN6_IS_ADDR_LINKLOCAL
1236
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
1237
705
if(if_index == AVAHI_IF_UNSPEC){
1238
706
fprintf_plus(stderr, "An IPv6 link-local address is"
1239
707
" incomplete without a network interface\n");
1241
709
goto mandos_end;
1242
710
}
1243
711
/* Set the network interface number as scope */
1244
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
712
to.in6.sin6_scope_id = (uint32_t)if_index;
1245
713
}
1246
714
} else {
1247
((struct sockaddr_in *)&to)->sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
1248
718
}
1249
719
1250
720
if(quit_now){
1258
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1259
729
perror_plus("if_indextoname");
1260
730
} else {
1261
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1262
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
1263
733
}
1264
734
} else {
1265
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1266
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
1267
737
}
1268
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1269
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1270
if(af == AF_INET6){
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1274
NI_NUMERICHOST);
1275
} else {
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
1279
NI_NUMERICHOST);
1280
}
1281
if(ret == EAI_SYSTEM){
1282
perror_plus("getnameinfo");
1283
} else if(ret != 0) {
1284
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1285
} else if(strcmp(addrstr, ip) != 0){
1286
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1287
}
1288
}
1289
1290
if(quit_now){
1291
errno = EINTR;
1292
goto mandos_end;
1293
}
1294
1295
while(true){
1296
if(af == AF_INET6){
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1299
} else {
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1302
}
1303
if(ret < 0){
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1310
&to)->sin6_addr)))
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1321
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1325
*/
1326
if(debug){
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1328
" direct route\n");
1329
}
1330
int e = errno;
1331
route_added = add_local_route(ip, if_index);
1332
if(route_added){
1333
continue;
1334
}
1335
errno = e;
1336
}
1337
if(errno != ECONNREFUSED or debug){
1338
int e = errno;
1339
perror_plus("connect");
1340
errno = e;
1341
}
1342
goto mandos_end;
1343
}
1344
1345
if(quit_now){
1346
errno = EINTR;
1347
goto mandos_end;
1348
}
1349
break;
740
const char *pcret;
741
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
744
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
747
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
754
}
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
762
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
764
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
}
767
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
1350
779
}
1351
780
1352
781
const char *out = mandos_protocol_version;
1388
817
goto mandos_end;
1389
818
}
1390
819
1391
/* This casting via intptr_t is to eliminate warning about casting
1392
an int to a pointer type. This is exactly how the GnuTLS Guile
1393
function "set-session-transport-fd!" does it. */
1394
gnutls_transport_set_ptr(session,
1395
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1396
822
1397
823
if(quit_now){
1398
824
errno = EINTR;
1503
929
if(buffer_length > 0){
1504
930
ssize_t decrypted_buffer_size;
1505
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1506
&decrypted_buffer, mc);
932
&decrypted_buffer);
1507
933
if(decrypted_buffer_size >= 0){
1508
934
1509
clearerr(stdout);
1510
935
written = 0;
1511
936
while(written < (size_t) decrypted_buffer_size){
1512
937
if(quit_now){
1528
953
}
1529
954
written += (size_t)ret;
1530
955
}
1531
ret = fflush(stdout);
1532
if(ret != 0){
1533
int e = errno;
1534
if(debug){
1535
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1536
strerror(errno));
1537
}
1538
errno = e;
1539
goto mandos_end;
1540
}
1541
956
retval = 0;
1542
957
}
1543
958
}
1546
961
1547
962
mandos_end:
1548
963
{
1549
if(route_added){
1550
if(not delete_local_route(ip, if_index)){
1551
fprintf_plus(stderr, "Failed to delete local route to %s on"
1552
" interface %d", ip, if_index);
1553
}
1554
}
1555
964
int e = errno;
1556
965
free(decrypted_buffer);
1557
966
free(buffer);
1558
967
if(tcp_sd >= 0){
1559
ret = close(tcp_sd);
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1560
969
}
1561
970
if(ret == -1){
1562
971
if(e == 0){
1587
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1588
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1589
998
flags,
1590
void *mc){
1591
if(r == NULL){
1592
return;
1593
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1594
1001
1595
1002
/* Called whenever a service has been resolved successfully or
1596
1003
timed out */
1597
1004
1598
1005
if(quit_now){
1599
avahi_s_service_resolver_free(r);
1600
1006
return;
1601
1007
}
1602
1008
1606
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1607
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1608
1014
domain,
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1611
1016
break;
1612
1017
1613
1018
case AVAHI_RESOLVER_FOUND:
1619
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1620
1025
host_name, ip, (intmax_t)interface, port);
1621
1026
}
1622
int ret = start_mandos_communication(ip, (in_port_t)port,
1623
interface,
1624
avahi_proto_to_af(proto),
1625
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1626
1029
if(ret == 0){
1627
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1628
1031
} else {
1629
if(not add_server(ip, (in_port_t)port, interface,
1630
avahi_proto_to_af(proto),
1631
&((mandos_context*)mc)->current_server)){
1632
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1633
" list\n", name);
1634
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1635
1034
}
1636
1035
}
1637
1036
}
1647
1046
const char *domain,
1648
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1649
1048
flags,
1650
void *mc){
1651
if(b == NULL){
1652
return;
1653
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1654
1051
1655
1052
/* Called whenever a new services becomes available on the LAN or
1656
1053
is removed from the LAN */
1664
1061
case AVAHI_BROWSER_FAILURE:
1665
1062
1666
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1667
avahi_strerror(avahi_server_errno
1668
(((mandos_context*)mc)->server)));
1669
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1670
1066
return;
1671
1067
1672
1068
case AVAHI_BROWSER_NEW:
1675
1071
the callback function is called the Avahi server will free the
1676
1072
resolver for us. */
1677
1073
1678
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1679
interface, protocol, name, type,
1680
domain, protocol, 0,
1681
resolve_callback, mc) == NULL)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1682
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1683
1078
" %s\n", name,
1684
avahi_strerror(avahi_server_errno
1685
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1686
1080
break;
1687
1081
1688
1082
case AVAHI_BROWSER_REMOVE:
1707
1101
signal_received = sig;
1708
1102
int old_errno = errno;
1709
1103
/* set main loop to exit */
1710
if(simple_poll != NULL){
1711
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1712
1106
}
1713
1107
errno = old_errno;
1714
1108
}
1715
1109
1716
__attribute__((nonnull, warn_unused_result))
1717
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1718
1111
int ret;
1719
int old_errno;
1720
1112
1721
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1722
1114
if(s < 0){
1723
old_errno = errno;
1724
1115
perror_plus("socket");
1725
errno = old_errno;
1726
1116
return false;
1727
1117
}
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1118
strcpy(ifr->ifr_name, ifname);
1730
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1731
1120
if(ret == -1){
1732
1121
if(debug){
1733
old_errno = errno;
1734
1122
perror_plus("ioctl SIOCGIFFLAGS");
1735
errno = old_errno;
1736
}
1737
if((close(s) == -1) and debug){
1738
old_errno = errno;
1739
perror_plus("close");
1740
errno = old_errno;
1741
1123
}
1742
1124
return false;
1743
1125
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1749
1126
return true;
1750
1127
}
1751
1128
1752
__attribute__((nonnull, warn_unused_result))
1753
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1754
1130
1755
1131
/* Reject the loopback device */
1797
1173
* corresponds to an acceptable network device.
1798
1174
* (This function is passed to scandir(3) as a filter function.)
1799
1175
*/
1800
__attribute__((nonnull, warn_unused_result))
1801
1176
int good_interface(const struct dirent *if_entry){
1802
1177
if(if_entry->d_name[0] == '.'){
1803
1178
return 0;
1819
1194
}
1820
1195
1821
1196
/*
1822
* This function determines if a network interface is up.
1823
*/
1824
__attribute__((nonnull, warn_unused_result))
1825
bool interface_is_up(const char *interface){
1826
struct ifreq ifr;
1827
if(not get_flags(interface, &ifr)){
1828
if(debug){
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
}
1832
return false;
1833
}
1834
1835
return (bool)(ifr.ifr_flags & IFF_UP);
1836
}
1837
1838
/*
1839
* This function determines if a network interface is running
1840
*/
1841
__attribute__((nonnull, warn_unused_result))
1842
bool interface_is_running(const char *interface){
1843
struct ifreq ifr;
1844
if(not get_flags(interface, &ifr)){
1845
if(debug){
1846
fprintf_plus(stderr, "Failed to get flags for interface "
1847
"\"%s\"\n", interface);
1848
}
1849
return false;
1850
}
1851
1852
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1853
}
1854
1855
__attribute__((nonnull, pure, warn_unused_result))
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1856
1239
int notdotentries(const struct dirent *direntry){
1857
1240
/* Skip "." and ".." */
1858
1241
if(direntry->d_name[0] == '.'
1865
1248
}
1866
1249
1867
1250
/* Is this directory entry a runnable program? */
1868
__attribute__((nonnull, warn_unused_result))
1869
1251
int runnable_hook(const struct dirent *direntry){
1870
1252
int ret;
1871
1253
size_t sret;
1879
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1880
1262
"abcdefghijklmnopqrstuvwxyz"
1881
1263
"0123456789"
1882
"_.-");
1264
"_-");
1883
1265
if((direntry->d_name)[sret] != '\0'){
1884
1266
/* Contains non-allowed characters */
1885
1267
if(debug){
1889
1271
return 0;
1890
1272
}
1891
1273
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1893
1282
if(ret == -1){
1894
1283
if(debug){
1895
1284
perror_plus("Could not stat hook");
1919
1308
return 1;
1920
1309
}
1921
1310
1922
__attribute__((nonnull, warn_unused_result))
1923
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1924
mandos_context *mc){
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1925
1312
int ret;
1926
1313
struct timespec now;
1927
1314
struct timespec waited_time;
1928
1315
intmax_t block_time;
1929
1316
1930
1317
while(true){
1931
if(mc->current_server == NULL){
1932
if(debug){
1318
if(mc.current_server == NULL){
1319
if (debug){
1933
1320
fprintf_plus(stderr, "Wait until first server is found."
1934
1321
" No timeout!\n");
1935
1322
}
1936
1323
ret = avahi_simple_poll_iterate(s, -1);
1937
1324
} else {
1938
if(debug){
1325
if (debug){
1939
1326
fprintf_plus(stderr, "Check current_server if we should run"
1940
1327
" it, or wait\n");
1941
1328
}
1948
1335
/* Calculating in ms how long time between now and server
1949
1336
who we visted longest time ago. Now - last seen. */
1950
1337
waited_time.tv_sec = (now.tv_sec
1951
- mc->current_server->last_seen.tv_sec);
1338
- mc.current_server->last_seen.tv_sec);
1952
1339
waited_time.tv_nsec = (now.tv_nsec
1953
- mc->current_server->last_seen.tv_nsec);
1340
- mc.current_server->last_seen.tv_nsec);
1954
1341
/* total time is 10s/10,000ms.
1955
1342
Converting to s from ms by dividing by 1,000,
1956
1343
and ns to ms by dividing by 1,000,000. */
1958
1345
- ((intmax_t)waited_time.tv_sec * 1000))
1959
1346
- ((intmax_t)waited_time.tv_nsec / 1000000));
1960
1347
1961
if(debug){
1348
if (debug){
1962
1349
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1963
1350
block_time);
1964
1351
}
1965
1352
1966
1353
if(block_time <= 0){
1967
ret = start_mandos_communication(mc->current_server->ip,
1968
mc->current_server->port,
1969
mc->current_server->if_index,
1970
mc->current_server->af, mc);
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1971
1358
if(ret == 0){
1972
avahi_simple_poll_quit(s);
1359
avahi_simple_poll_quit(mc.simple_poll);
1973
1360
return 0;
1974
1361
}
1975
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1976
&mc->current_server->last_seen);
1363
&mc.current_server->last_seen);
1977
1364
if(ret == -1){
1978
1365
perror_plus("clock_gettime");
1979
1366
return -1;
1980
1367
}
1981
mc->current_server = mc->current_server->next;
1368
mc.current_server = mc.current_server->next;
1982
1369
block_time = 0; /* Call avahi to find new Mandos
1983
1370
servers, but don't block */
1984
1371
}
1986
1373
ret = avahi_simple_poll_iterate(s, (int)block_time);
1987
1374
}
1988
1375
if(ret != 0){
1989
if(ret > 0 or errno != EINTR){
1376
if (ret > 0 or errno != EINTR){
1990
1377
return (ret != 1) ? ret : 0;
1991
1378
}
1992
1379
}
1993
1380
}
1994
1381
}
1995
1382
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1383
bool run_network_hooks(const char *mode, const char *interface,
1998
1384
const float delay){
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2005
if(debug){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2008
}
2009
} else {
2010
perror_plus("open");
2011
}
2012
return;
2013
}
2014
}
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2016
if(devnull == -1){
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2018
return;
2019
}
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
1385
struct dirent **direntries;
1386
struct dirent *direntry;
1387
int ret;
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1389
alphasort);
2022
1390
if(numhooks == -1){
2023
1391
perror_plus("scandir");
2024
close(devnull);
2025
return;
2026
}
2027
struct dirent *direntry;
2028
int ret;
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2031
if(debug){
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2033
direntry->d_name);
2034
}
2035
pid_t hook_pid = fork();
2036
if(hook_pid == 0){
2037
/* Child */
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
2041
perror_plus("Failed to raise privileges");
2042
_exit(EX_NOPERM);
2043
}
2044
/* Set group */
2045
errno = 0;
2046
ret = setgid(0);
2047
if(ret == -1){
2048
perror_plus("setgid");
2049
_exit(EX_NOPERM);
2050
}
2051
/* Reset supplementary groups */
2052
errno = 0;
2053
ret = setgroups(0, NULL);
2054
if(ret == -1){
2055
perror_plus("setgroups");
2056
_exit(EX_NOPERM);
2057
}
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
if(ret == -1){
2060
perror_plus("setenv");
2061
_exit(EX_OSERR);
2062
}
2063
ret = setenv("DEVICE", interface, 1);
2064
if(ret == -1){
2065
perror_plus("setenv");
2066
_exit(EX_OSERR);
2067
}
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2069
if(ret == -1){
2070
perror_plus("setenv");
2071
_exit(EX_OSERR);
2072
}
2073
ret = setenv("MODE", mode, 1);
2074
if(ret == -1){
2075
perror_plus("setenv");
2076
_exit(EX_OSERR);
2077
}
2078
char *delaystring;
2079
ret = asprintf(&delaystring, "%f", (double)delay);
2080
if(ret == -1){
1392
} else {
1393
int devnull = open("/dev/null", O_RDONLY);
1394
for(int i = 0; i < numhooks; i++){
1395
direntry = direntries[i];
1396
char *fullname = NULL;
1397
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1398
if(ret < 0){
2081
1399
perror_plus("asprintf");
2082
_exit(EX_OSERR);
2083
}
2084
ret = setenv("DELAY", delaystring, 1);
2085
if(ret == -1){
1400
continue;
1401
}
1402
if(debug){
1403
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1404
direntry->d_name);
1405
}
1406
pid_t hook_pid = fork();
1407
if(hook_pid == 0){
1408
/* Child */
1409
dup2(devnull, STDIN_FILENO);
1410
close(devnull);
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1413
if(ret == -1){
1414
perror_plus("setenv");
1415
return false;
1416
}
1417
ret = setenv("DEVICE", interface, 1);
1418
if(ret == -1){
1419
perror_plus("setenv");
1420
return false;
1421
}
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1423
if(ret == -1){
1424
perror_plus("setenv");
1425
return false;
1426
}
1427
ret = setenv("MODE", mode, 1);
1428
if(ret == -1){
1429
perror_plus("setenv");
1430
return false;
1431
}
1432
char *delaystring;
1433
ret = asprintf(&delaystring, "%f", delay);
1434
if(ret == -1){
1435
perror_plus("asprintf");
1436
return false;
1437
}
1438
ret = setenv("DELAY", delaystring, 1);
1439
if(ret == -1){
1440
free(delaystring);
1441
perror_plus("setenv");
1442
return false;
1443
}
2086
1444
free(delaystring);
2087
perror_plus("setenv");
2088
_exit(EX_OSERR);
2089
}
2090
free(delaystring);
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2093
if(ret == -1){
2094
perror_plus("setenv");
2095
_exit(EX_OSERR);
2096
}
2097
}
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
direntry->d_name,
2100
O_RDONLY));
2101
if(hook_fd == -1){
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2104
}
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2108
}
2109
ret = dup2(devnull, STDIN_FILENO);
2110
if(ret == -1){
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2112
_exit(EX_OSERR);
2113
}
2114
ret = close(devnull);
2115
if(ret == -1){
2116
perror_plus("close");
2117
_exit(EX_OSERR);
2118
}
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2120
if(ret == -1){
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2122
_exit(EX_OSERR);
2123
}
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2125
environ) == -1){
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2128
}
2129
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
int status;
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2138
free(direntry);
2139
continue;
2140
}
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2146
free(direntry);
2147
continue;
2148
}
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2152
WTERMSIG(status));
2153
free(direntry);
2154
continue;
2155
} else {
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
continue;
2160
}
2161
}
2162
if(debug){
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
direntry->d_name);
2165
}
2166
free(direntry);
2167
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2171
} else {
2172
hookdir_fd = -1;
2173
}
2174
close(devnull);
2175
}
2176
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
2181
int ret;
2182
struct ifreq network;
2183
unsigned int if_index = if_nametoindex(interface);
2184
if(if_index == 0){
2185
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2186
errno = old_errno;
2187
return ENXIO;
2188
}
2189
2190
if(quit_now){
2191
errno = old_errno;
2192
return EINTR;
2193
}
2194
2195
if(not interface_is_up(interface)){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
2198
if(not get_flags(interface, &network)){
2199
ret_errno = errno;
2200
fprintf_plus(stderr, "Failed to get flags for interface "
2201
"\"%s\"\n", interface);
2202
errno = old_errno;
2203
return ret_errno;
2204
}
2205
network.ifr_flags |= IFF_UP; /* set flag */
2206
2207
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2208
if(sd == -1){
2209
ret_errno = errno;
2210
perror_plus("socket");
2211
errno = old_errno;
2212
return ret_errno;
2213
}
2214
2215
if(quit_now){
2216
ret = close(sd);
2217
if(ret == -1){
2218
perror_plus("close");
2219
}
2220
errno = old_errno;
2221
return EINTR;
2222
}
2223
2224
if(debug){
2225
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2226
interface);
2227
}
2228
2229
/* Raise privileges */
2230
ret_errno = raise_privileges();
2231
if(ret_errno != 0){
2232
errno = ret_errno;
2233
perror_plus("Failed to raise privileges");
2234
}
2235
2236
#ifdef __linux__
2237
int ret_linux;
2238
bool restore_loglevel = false;
2239
if(ret_errno == 0){
2240
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
messages about the network interface to mess up the prompt */
2242
ret_linux = klogctl(8, NULL, 5);
2243
if(ret_linux == -1){
2244
perror_plus("klogctl");
2245
} else {
2246
restore_loglevel = true;
2247
}
2248
}
2249
#endif /* __linux__ */
2250
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2251
ioctl_errno = errno;
2252
#ifdef __linux__
2253
if(restore_loglevel){
2254
ret_linux = klogctl(7, NULL, 0);
2255
if(ret_linux == -1){
2256
perror_plus("klogctl");
2257
}
2258
}
2259
#endif /* __linux__ */
2260
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
2270
2271
/* Close the socket */
2272
ret = close(sd);
2273
if(ret == -1){
2274
perror_plus("close");
2275
}
2276
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2280
errno = old_errno;
2281
return ioctl_errno;
2282
}
2283
} else if(debug){
2284
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2285
interface);
2286
}
2287
2288
/* Sleep checking until interface is running.
2289
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
2291
if(interface_is_running(interface)){
2292
break;
2293
}
2294
struct timespec sleeptime = { .tv_nsec = 250000000 };
2295
ret = nanosleep(&sleeptime, NULL);
2296
if(ret == -1 and errno != EINTR){
2297
perror_plus("nanosleep");
2298
}
2299
}
2300
2301
errno = old_errno;
2302
return 0;
2303
}
2304
2305
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
2308
struct ifreq network;
2309
unsigned int if_index = if_nametoindex(interface);
2310
if(if_index == 0){
2311
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2312
errno = old_errno;
2313
return ENXIO;
2314
}
2315
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
2318
if(not get_flags(interface, &network) and debug){
2319
ret_errno = errno;
2320
fprintf_plus(stderr, "Failed to get flags for interface "
2321
"\"%s\"\n", interface);
2322
errno = old_errno;
2323
return ret_errno;
2324
}
2325
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2326
2327
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2328
if(sd == -1){
2329
ret_errno = errno;
2330
perror_plus("socket");
2331
errno = old_errno;
2332
return ret_errno;
2333
}
2334
2335
if(debug){
2336
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2337
interface);
2338
}
2339
2340
/* Raise privileges */
2341
ret_errno = raise_privileges();
2342
if(ret_errno != 0){
2343
errno = ret_errno;
2344
perror_plus("Failed to raise privileges");
2345
}
2346
2347
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
ioctl_errno = errno;
2349
2350
/* If raise_privileges() succeeded above */
2351
if(ret_errno == 0){
2352
/* Lower privileges */
2353
ret_errno = lower_privileges();
2354
if(ret_errno != 0){
2355
errno = ret_errno;
2356
perror_plus("Failed to lower privileges");
2357
}
2358
}
2359
2360
/* Close the socket */
2361
int ret = close(sd);
2362
if(ret == -1){
2363
perror_plus("close");
2364
}
2365
2366
if(ret_setflags == -1){
2367
errno = ioctl_errno;
2368
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2369
errno = old_errno;
2370
return ioctl_errno;
2371
}
2372
} else if(debug){
2373
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2374
interface);
2375
}
2376
2377
errno = old_errno;
2378
return 0;
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1447
} else {
1448
int status;
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1450
perror_plus("waitpid");
1451
free(fullname);
1452
continue;
1453
}
1454
if(WIFEXITED(status)){
1455
if(WEXITSTATUS(status) != 0){
1456
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1457
" with status %d\n", direntry->d_name,
1458
WEXITSTATUS(status));
1459
free(fullname);
1460
continue;
1461
}
1462
} else if(WIFSIGNALED(status)){
1463
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1464
" signal %d\n", direntry->d_name,
1465
WTERMSIG(status));
1466
free(fullname);
1467
continue;
1468
} else {
1469
fprintf_plus(stderr, "Warning: network hook \"%s\""
1470
" crashed\n", direntry->d_name);
1471
free(fullname);
1472
continue;
1473
}
1474
}
1475
free(fullname);
1476
if(debug){
1477
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1478
direntry->d_name);
1479
}
1480
}
1481
close(devnull);
1482
}
1483
return true;
2379
1484
}
2380
1485
2381
1486
int main(int argc, char *argv[]){
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
2387
1487
AvahiSServiceBrowser *sb = NULL;
2388
error_t ret_errno;
1488
int error;
2389
1489
int ret;
2390
1490
intmax_t tmpmax;
2391
1491
char *tmp;
2392
1492
int exitcode = EXIT_SUCCESS;
2393
char *interfaces_to_take_down = NULL;
2394
size_t interfaces_to_take_down_size = 0;
2395
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2396
char old_tempdir[] = "/tmp/mandosXXXXXX";
2397
char *tempdir = NULL;
1493
const char *interface = "";
1494
struct ifreq network;
1495
int sd = -1;
1496
bool take_down_interface = false;
1497
uid_t uid;
1498
gid_t gid;
1499
char tempdir[] = "/tmp/mandosXXXXXX";
1500
bool tempdir_created = false;
2398
1501
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2399
1502
const char *seckey = PATHDIR "/" SECKEY;
2400
1503
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
char *interfaces_hooks = NULL;
2403
1504
2404
1505
bool gnutls_initialized = false;
2405
1506
bool gpgme_initialized = false;
2457
1558
.doc = "Bit length of the prime number used in the"
2458
1559
" Diffie-Hellman key exchange",
2459
1560
.group = 2 },
2460
{ .name = "dh-params", .key = 134,
2461
.arg = "FILE",
2462
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2463
" for the Diffie-Hellman key exchange",
2464
.group = 2 },
2465
1561
{ .name = "priority", .key = 130,
2466
1562
.arg = "STRING",
2467
1563
.doc = "GnuTLS priority string for the TLS handshake",
2472
1568
.group = 2 },
2473
1569
{ .name = "retry", .key = 132,
2474
1570
.arg = "SECONDS",
2475
.doc = "Retry interval used when denied by the Mandos server",
1571
.doc = "Retry interval used when denied by the mandos server",
2476
1572
.group = 2 },
2477
1573
{ .name = "network-hook-dir", .key = 133,
2478
1574
.arg = "DIR",
2501
1597
connect_to = arg;
2502
1598
break;
2503
1599
case 'i': /* --interface */
2504
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2505
arg, (int)',');
2506
if(ret_errno != 0){
2507
argp_error(state, "%s", strerror(ret_errno));
2508
}
1600
interface = arg;
2509
1601
break;
2510
1602
case 's': /* --seckey */
2511
1603
seckey = arg;
2522
1614
}
2523
1615
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2524
1616
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
2528
1617
case 130: /* --priority */
2529
1618
mc.priority = arg;
2530
1619
break;
2557
1646
argp_state_help(state, state->out_stream,
2558
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2559
1648
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
2560
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2561
1652
exit(argp_err_exit_status);
2562
1653
break;
2570
1661
.args_doc = "",
2571
1662
.doc = "Mandos client -- Get and decrypt"
2572
1663
" passwords from a Mandos server" };
2573
ret_errno = argp_parse(&argp, argc, argv,
2574
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2575
switch(ret_errno){
1664
ret = argp_parse(&argp, argc, argv,
1665
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1666
switch(ret){
2576
1667
case 0:
2577
1668
break;
2578
1669
case ENOMEM:
2579
1670
default:
2580
errno = ret_errno;
1671
errno = ret;
2581
1672
perror_plus("argp_parse");
2582
1673
exitcode = EX_OSERR;
2583
1674
goto end;
2586
1677
goto end;
2587
1678
}
2588
1679
}
2589
2590
{
1680
1681
if(getuid() == 0){
2591
1682
/* Work around Debian bug #633582:
2592
<https://bugs.debian.org/633582> */
2593
2594
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2598
perror_plus("Failed to raise privileges");
2599
} else {
2600
struct stat st;
2601
2602
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2603
int seckey_fd = open(seckey, O_RDONLY);
2604
if(seckey_fd == -1){
2605
perror_plus("open");
2606
} else {
2607
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2608
if(ret == -1){
2609
perror_plus("fstat");
2610
} else {
2611
if(S_ISREG(st.st_mode)
2612
and st.st_uid == 0 and st.st_gid == 0){
2613
ret = fchown(seckey_fd, uid, gid);
2614
if(ret == -1){
2615
perror_plus("fchown");
2616
}
2617
}
2618
}
2619
close(seckey_fd);
2620
}
2621
}
2622
2623
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2624
int pubkey_fd = open(pubkey, O_RDONLY);
2625
if(pubkey_fd == -1){
2626
perror_plus("open");
2627
} else {
2628
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2629
if(ret == -1){
2630
perror_plus("fstat");
2631
} else {
2632
if(S_ISREG(st.st_mode)
2633
and st.st_uid == 0 and st.st_gid == 0){
2634
ret = fchown(pubkey_fd, uid, gid);
2635
if(ret == -1){
2636
perror_plus("fchown");
2637
}
2638
}
2639
}
2640
close(pubkey_fd);
2641
}
2642
}
2643
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2649
} else {
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2651
if(ret == -1){
2652
perror_plus("fstat");
2653
} else {
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2657
if(ret == -1){
2658
perror_plus("fchown");
2659
}
2660
}
2661
}
2662
close(dhparams_fd);
2663
}
2664
}
2665
2666
/* Lower privileges */
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2670
perror_plus("Failed to lower privileges");
2671
}
2672
}
2673
}
2674
2675
/* Remove invalid interface names (except "none") */
2676
{
2677
char *interface = NULL;
2678
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2679
interface))){
2680
if(strcmp(interface, "none") != 0
2681
and if_nametoindex(interface) == 0){
2682
if(interface[0] != '\0'){
2683
fprintf_plus(stderr, "Not using nonexisting interface"
2684
" \"%s\"\n", interface);
2685
}
2686
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2687
interface = NULL;
2688
}
1683
<http://bugs.debian.org/633582> */
1684
struct stat st;
1685
1686
/* Re-raise priviliges */
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
2689
1740
}
2690
1741
}
2691
1742
2692
1743
/* Run network hooks */
2693
1744
{
2694
if(mc.interfaces != NULL){
2695
interfaces_hooks = malloc(mc.interfaces_size);
2696
if(interfaces_hooks == NULL){
2697
perror_plus("malloc");
2698
goto end;
2699
}
2700
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2701
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2702
}
2703
run_network_hooks("start", interfaces_hooks != NULL ?
2704
interfaces_hooks : "", delay);
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
1751
}
1752
}
1753
if(not run_network_hooks("start", interface, delay)){
1754
goto end;
1755
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
2705
1764
}
2706
1765
2707
1766
if(not debug){
2708
1767
avahi_set_log_function(empty_log);
2709
1768
}
2710
1769
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
1797
exitcode = EXIT_FAILURE;
1798
goto end;
1799
}
1800
}
1801
2711
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2712
1803
from the signal handler */
2713
1804
/* Initialize the pseudo-RNG for Avahi */
2714
1805
srand((unsigned int) time(NULL));
2715
simple_poll = avahi_simple_poll_new();
2716
if(simple_poll == NULL){
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
2717
1808
fprintf_plus(stderr,
2718
1809
"Avahi: Failed to create simple poll object.\n");
2719
1810
exitcode = EX_UNAVAILABLE;
2783
1874
}
2784
1875
}
2785
1876
2786
/* If no interfaces were specified, make a list */
2787
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2789
/* Look for any good interfaces */
2790
ret = scandir(sys_class_net, &direntries, good_interface,
2791
alphasort);
2792
if(ret >= 1){
2793
/* Add all found interfaces to interfaces list */
2794
for(int i = 0; i < ret; ++i){
2795
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2796
direntries[i]->d_name);
2797
if(ret_errno != 0){
2798
errno = ret_errno;
2799
perror_plus("argz_add");
2800
free(direntries[i]);
2801
continue;
2802
}
2803
if(debug){
2804
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
direntries[i]->d_name);
2806
}
2807
free(direntries[i]);
2808
}
2809
free(direntries);
2810
} else {
2811
if(ret == 0){
2812
free(direntries);
2813
}
2814
fprintf_plus(stderr, "Could not find a network interface\n");
2815
exitcode = EXIT_FAILURE;
2816
goto end;
2817
}
2818
}
2819
2820
/* Bring up interfaces which are down, and remove any "none"s */
2821
{
2822
char *interface = NULL;
2823
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2824
interface))){
2825
/* If interface name is "none", stop bringing up interfaces.
2826
Also remove all instances of "none" from the list */
2827
if(strcmp(interface, "none") == 0){
2828
argz_delete(&mc.interfaces, &mc.interfaces_size,
2829
interface);
2830
interface = NULL;
2831
while((interface = argz_next(mc.interfaces,
2832
mc.interfaces_size, interface))){
2833
if(strcmp(interface, "none") == 0){
2834
argz_delete(&mc.interfaces, &mc.interfaces_size,
2835
interface);
2836
interface = NULL;
1877
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1880
if(if_index == 0){
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1883
goto end;
1884
}
1885
1886
if(quit_now){
1887
goto end;
1888
}
1889
1890
/* Re-raise priviliges */
1891
errno = 0;
1892
ret = seteuid(0);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
1897
#ifdef __linux__
1898
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1900
ret = klogctl(8, NULL, 5);
1901
bool restore_loglevel = true;
1902
if(ret == -1){
1903
restore_loglevel = false;
1904
perror_plus("klogctl");
1905
}
1906
#endif /* __linux__ */
1907
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1909
if(sd < 0){
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1912
#ifdef __linux__
1913
if(restore_loglevel){
1914
ret = klogctl(7, NULL, 0);
1915
if(ret == -1){
1916
perror_plus("klogctl");
1917
}
1918
}
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1921
errno = 0;
1922
ret = seteuid(uid);
1923
if(ret == -1){
1924
perror_plus("seteuid");
1925
}
1926
goto end;
1927
}
1928
strcpy(network.ifr_name, interface);
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1930
if(ret == -1){
1931
perror_plus("ioctl SIOCGIFFLAGS");
1932
#ifdef __linux__
1933
if(restore_loglevel){
1934
ret = klogctl(7, NULL, 0);
1935
if(ret == -1){
1936
perror_plus("klogctl");
1937
}
1938
}
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
if((network.ifr_flags & IFF_UP) == 0){
1950
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1953
if(ret == -1){
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1957
#ifdef __linux__
1958
if(restore_loglevel){
1959
ret = klogctl(7, NULL, 0);
1960
if(ret == -1){
1961
perror_plus("klogctl");
2837
1962
}
2838
1963
}
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
}
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1976
for(int i=0; i < delay * 4; i++){
1977
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1978
if(ret == -1){
1979
perror_plus("ioctl SIOCGIFFLAGS");
1980
} else if(network.ifr_flags & IFF_RUNNING){
2839
1981
break;
2840
1982
}
2841
bool interface_was_up = interface_is_up(interface);
2842
errno = bring_up_interface(interface, delay);
2843
if(not interface_was_up){
2844
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2847
} else {
2848
errno = argz_add(&interfaces_to_take_down,
2849
&interfaces_to_take_down_size,
2850
interface);
2851
if(errno != 0){
2852
perror_plus("argz_add");
2853
}
2854
}
2855
}
2856
}
2857
if(debug and (interfaces_to_take_down == NULL)){
2858
fprintf_plus(stderr, "No interfaces were brought up\n");
2859
}
2860
}
2861
2862
/* If we only got one interface, explicitly use only that one */
2863
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2864
if(debug){
2865
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2866
mc.interfaces);
2867
}
2868
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
ret = nanosleep(&sleeptime, NULL);
1985
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1987
}
1988
}
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
if(ret == -1){
1993
perror_plus("close");
1994
}
1995
}
1996
#ifdef __linux__
1997
if(restore_loglevel){
1998
/* Restores kernel loglevel to default */
1999
ret = klogctl(7, NULL, 0);
2000
if(ret == -1){
2001
perror_plus("klogctl");
2002
}
2003
}
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2006
errno = 0;
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2869
2012
}
2870
2013
2871
2014
if(quit_now){
2872
2015
goto end;
2873
2016
}
2874
2017
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2018
ret = init_gnutls_global(pubkey, seckey);
2876
2019
if(ret == -1){
2877
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2878
2021
exitcode = EX_UNAVAILABLE;
2885
2028
goto end;
2886
2029
}
2887
2030
2888
/* Try /run/tmp before /tmp */
2889
tempdir = mkdtemp(run_tempdir);
2890
if(tempdir == NULL and errno == ENOENT){
2891
if(debug){
2892
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2893
run_tempdir, old_tempdir);
2894
}
2895
tempdir = mkdtemp(old_tempdir);
2896
}
2897
if(tempdir == NULL){
2031
if(mkdtemp(tempdir) == NULL){
2898
2032
perror_plus("mkdtemp");
2899
2033
goto end;
2900
2034
}
2035
tempdir_created = true;
2901
2036
2902
2037
if(quit_now){
2903
2038
goto end;
2904
2039
}
2905
2040
2906
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2907
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2908
2043
exitcode = EX_UNAVAILABLE;
2909
2044
goto end;
2919
2054
/* Connect directly, do not use Zeroconf */
2920
2055
/* (Mainly meant for debugging) */
2921
2056
char *address = strrchr(connect_to, ':');
2922
2923
2057
if(address == NULL){
2924
2058
fprintf_plus(stderr, "No colon in address\n");
2925
2059
exitcode = EX_USAGE;
2930
2064
goto end;
2931
2065
}
2932
2066
2933
in_port_t port;
2067
uint16_t port;
2934
2068
errno = 0;
2935
2069
tmpmax = strtoimax(address+1, &tmp, 10);
2936
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2937
or tmpmax != (in_port_t)tmpmax){
2071
or tmpmax != (uint16_t)tmpmax){
2938
2072
fprintf_plus(stderr, "Bad port number\n");
2939
2073
exitcode = EX_USAGE;
2940
2074
goto end;
2941
2075
}
2942
2076
2943
2077
if(quit_now){
2944
2078
goto end;
2945
2079
}
2946
2080
2947
port = (in_port_t)tmpmax;
2081
port = (uint16_t)tmpmax;
2948
2082
*address = '\0';
2949
2083
/* Colon in address indicates IPv6 */
2950
2084
int af;
2966
2100
}
2967
2101
2968
2102
while(not quit_now){
2969
ret = start_mandos_communication(address, port, if_index, af,
2970
&mc);
2103
ret = start_mandos_communication(address, port, if_index, af);
2971
2104
if(quit_now or ret == 0){
2972
2105
break;
2973
2106
}
2975
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2976
2109
(int)retry_interval);
2977
2110
}
2978
sleep((unsigned int)retry_interval);
2111
sleep((int)retry_interval);
2979
2112
}
2980
2113
2981
if(not quit_now){
2114
if (not quit_now){
2982
2115
exitcode = EXIT_SUCCESS;
2983
2116
}
2984
2117
2999
2132
config.publish_domain = 0;
3000
2133
3001
2134
/* Allocate a new server */
3002
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
2135
mc.server = avahi_server_new(avahi_simple_poll_get
2136
(mc.simple_poll), &config, NULL,
2137
NULL, &error);
3004
2138
3005
2139
/* Free the Avahi configuration data */
3006
2140
avahi_server_config_free(&config);
3009
2143
/* Check if creating the Avahi server object succeeded */
3010
2144
if(mc.server == NULL){
3011
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3012
avahi_strerror(ret));
2146
avahi_strerror(error));
3013
2147
exitcode = EX_UNAVAILABLE;
3014
2148
goto end;
3015
2149
}
3021
2155
/* Create the Avahi service browser */
3022
2156
sb = avahi_s_service_browser_new(mc.server, if_index,
3023
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3024
NULL, 0, browse_callback,
3025
(void *)&mc);
2158
NULL, 0, browse_callback, NULL);
3026
2159
if(sb == NULL){
3027
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3028
2161
avahi_strerror(avahi_server_errno(mc.server)));
3039
2172
if(debug){
3040
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
3041
2174
}
3042
3043
ret = avahi_loop_with_timeout(simple_poll,
3044
(int)(retry_interval * 1000), &mc);
2175
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
3045
2178
if(debug){
3046
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3047
2180
(ret == 0) ? "successfully" : "with error");
3050
2183
end:
3051
2184
3052
2185
if(debug){
3053
if(signal_received){
3054
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3055
argv[0], signal_received,
3056
strsignal(signal_received));
3057
} else {
3058
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3059
}
2186
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3060
2187
}
3061
2188
3062
2189
/* Cleanup things */
3063
free(mc.interfaces);
3064
3065
2190
if(sb != NULL)
3066
2191
avahi_s_service_browser_free(sb);
3067
2192
3068
2193
if(mc.server != NULL)
3069
2194
avahi_server_free(mc.server);
3070
2195
3071
if(simple_poll != NULL)
3072
avahi_simple_poll_free(simple_poll);
2196
if(mc.simple_poll != NULL)
2197
avahi_simple_poll_free(mc.simple_poll);
3073
2198
3074
2199
if(gnutls_initialized){
3075
2200
gnutls_certificate_free_credentials(mc.cred);
2201
gnutls_global_deinit();
3076
2202
gnutls_dh_params_deinit(mc.dh_params);
3077
2203
}
3078
2204
3086
2212
mc.current_server->prev->next = NULL;
3087
2213
while(mc.current_server != NULL){
3088
2214
server *next = mc.current_server->next;
3089
#ifdef __GNUC__
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3092
#endif
3093
free((char *)(mc.current_server->ip));
3094
#ifdef __GNUC__
3095
#pragma GCC diagnostic pop
3096
#endif
3097
2215
free(mc.current_server);
3098
2216
mc.current_server = next;
3099
2217
}
3100
2218
}
3101
2219
3102
/* Re-raise privileges */
2220
/* Re-raise priviliges */
3103
2221
{
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
3107
perror_plus("Failed to raise privileges");
3108
} else {
3109
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3113
3114
/* Take down the network interfaces which were brought up */
3115
{
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3119
interface))){
3120
ret = take_down_interface(interface);
3121
if(ret != 0){
3122
errno = ret;
3123
perror_plus("Failed to take down interface");
3124
}
3125
}
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
fprintf_plus(stderr, "No interfaces needed to be taken"
3128
" down\n");
3129
}
3130
}
3131
}
3132
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
3136
perror_plus("Failed to lower privileges permanently");
3137
}
3138
}
3139
3140
free(interfaces_to_take_down);
3141
free(interfaces_hooks);
3142
3143
void clean_dir_at(int base, const char * const dirname,
3144
uintmax_t level){
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2236
if(ret == -1){
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2243
}
2244
}
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2246
if(ret == -1){
2247
perror_plus("close");
2248
}
2249
}
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
2257
}
2258
}
2259
2260
/* Removes the GPGME temp directory and all files inside */
2261
if(tempdir_created){
3145
2262
struct dirent **direntries = NULL;
3146
int dret;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3148
O_RDONLY
3149
| O_NOFOLLOW
3150
| O_DIRECTORY
3151
| O_PATH));
3152
if(dir_fd == -1){
3153
perror_plus("open");
3154
return;
3155
}
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
2263
struct dirent *direntry = NULL;
2264
int numentries = scandir(tempdir, &direntries, notdotentries,
2265
alphasort);
2266
if (numentries > 0){
3159
2267
for(int i = 0; i < numentries; i++){
3160
if(debug){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3163
}
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3165
if(dret == -1){
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3168
AT_REMOVEDIR);
3169
}
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3175
dret = 0;
3176
}
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3180
}
3181
}
3182
free(direntries[i]);
3183
}
3184
3185
/* need to clean even if 0 because man page doesn't specify */
3186
free(direntries);
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3190
}
3191
} else {
3192
perror_plus("scandirat");
3193
}
3194
close(dir_fd);
3195
}
3196
3197
/* Removes the GPGME temp directory and all files inside */
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
2268
direntry = direntries[i];
2269
char *fullname = NULL;
2270
ret = asprintf(&fullname, "%s/%s", tempdir,
2271
direntry->d_name);
2272
if(ret < 0){
2273
perror_plus("asprintf");
2274
continue;
2275
}
2276
ret = remove(fullname);
2277
if(ret == -1){
2278
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2279
strerror(errno));
2280
}
2281
free(fullname);
2282
}
2283
}
2284
2285
/* need to clean even if 0 because man page doesn't specify */
2286
free(direntries);
2287
if (numentries == -1){
2288
perror_plus("scandir");
2289
}
2290
ret = rmdir(tempdir);
2291
if(ret == -1 and errno != ENOENT){
2292
perror_plus("rmdir");
2293
}
3200
2294
}
3201
2295
3202
2296
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0