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237.15.6
(compared to revision 237.7.421)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2011-11-14 19:10:50 UTC
- mto: (237.16.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: belorn@fukt.bsnet.se-20111114191050-g11po6084bl9j5kf
replace calls to fprintf with fprintf_plus.
- files removed:
- bugs.xml
- debian/upstream
- network-hooks.d
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
56
55
opendir(), DIR */
57
56
#include <sys/stat.h> /* open(), S_ISREG */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
61
*/
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
63
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
78
73
*/
79
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
75
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
84
78
#include <iso646.h> /* not, or, and */
85
79
#include <argp.h> /* struct argp_option, error_t, struct
86
80
argp_state, struct argp,
93
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
94
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
95
89
WEXITSTATUS(), WTERMSIG() */
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
103
90
104
91
#ifdef __linux__
105
92
#include <sys/klog.h> /* klogctl() */
147
134
static const char sys_class_net[] = "/sys/class/net";
148
135
char *connect_to = NULL;
149
136
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
153
137
154
138
/* Doubly linked list that need to be circularly linked when used */
155
139
typedef struct server{
156
140
const char *ip;
157
in_port_t port;
141
uint16_t port;
158
142
AvahiIfIndex if_index;
159
143
int af;
160
144
struct timespec last_seen;
164
148
165
149
/* Used for passing in values through the Avahi callback functions */
166
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
167
152
AvahiServer *server;
168
153
gnutls_certificate_credentials_t cred;
169
154
unsigned int dh_bits;
171
156
const char *priority;
172
157
gpgme_ctx_t ctx;
173
158
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
176
159
} mandos_context;
177
160
178
/* global so signal handler can reach it*/
179
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 };
180
166
181
167
sig_atomic_t quit_now = 0;
182
168
int signal_received = 0;
183
169
184
170
/* Function to use when printing errors */
185
171
void perror_plus(const char *print_text){
186
int e = errno;
187
172
fprintf(stderr, "Mandos plugin %s: ",
188
173
program_invocation_short_name);
189
errno = e;
190
174
perror(print_text);
191
175
}
192
176
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
177
int fprintf_plus(FILE *stream, const char *format, ...){
195
178
va_list ap;
196
179
va_start (ap, format);
197
180
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
183
}
202
184
203
185
/*
205
187
* bytes. "buffer_capacity" is how much is currently allocated,
206
188
* "buffer_length" is how much is already used.
207
189
*/
208
__attribute__((nonnull, warn_unused_result))
209
190
size_t incbuffer(char **buffer, size_t buffer_length,
210
191
size_t buffer_capacity){
211
192
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
218
195
return 0;
219
196
}
220
*buffer = new_buf;
221
197
buffer_capacity += BUFFER_SIZE;
222
198
}
223
199
return buffer_capacity;
224
200
}
225
201
226
202
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
230
205
int ret;
231
206
server *new_server = malloc(sizeof(server));
232
207
if(new_server == NULL){
233
208
perror_plus("malloc");
234
return false;
209
return -1;
235
210
}
236
211
*new_server = (server){ .ip = strdup(ip),
237
212
.port = port,
239
214
.af = af };
240
215
if(new_server->ip == NULL){
241
216
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
return false;
217
return -1;
258
218
}
259
219
/* Special case of first server */
260
if(*current_server == NULL){
220
if (mc.current_server == NULL){
261
221
new_server->next = new_server;
262
222
new_server->prev = new_server;
263
*current_server = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
264
225
} else {
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
268
228
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
270
}
271
return true;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
272
237
}
273
238
274
239
/*
275
240
* Initialize GPGME.
276
241
*/
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
282
244
gpgme_error_t rc;
283
245
gpgme_engine_info_t engine_info;
284
246
247
285
248
/*
286
249
* Helper function to insert pub and seckey to the engine keyring.
287
250
*/
288
bool import_key(const char * const filename){
251
bool import_key(const char *filename){
289
252
int ret;
290
253
int fd;
291
254
gpgme_data_t pgp_data;
299
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
300
263
if(rc != GPG_ERR_NO_ERROR){
301
264
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
265
gpgme_strsource(rc), gpgme_strerror(rc));
303
266
return false;
304
267
}
305
268
306
rc = gpgme_op_import(mc->ctx, pgp_data);
269
rc = gpgme_op_import(mc.ctx, pgp_data);
307
270
if(rc != GPG_ERR_NO_ERROR){
308
271
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
272
gpgme_strsource(rc), gpgme_strerror(rc));
310
273
return false;
311
274
}
312
275
313
ret = close(fd);
276
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
277
if(ret == -1){
315
278
perror_plus("close");
316
279
}
327
290
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
328
291
if(rc != GPG_ERR_NO_ERROR){
329
292
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
293
gpgme_strsource(rc), gpgme_strerror(rc));
331
294
return false;
332
295
}
333
296
335
298
rc = gpgme_get_engine_info(&engine_info);
336
299
if(rc != GPG_ERR_NO_ERROR){
337
300
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
301
gpgme_strsource(rc), gpgme_strerror(rc));
339
302
return false;
340
303
}
341
304
while(engine_info != NULL){
347
310
engine_info = engine_info->next;
348
311
}
349
312
if(engine_info == NULL){
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
351
tempdir);
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
352
314
return false;
353
315
}
354
316
355
317
/* Create new GPGME "context" */
356
rc = gpgme_new(&(mc->ctx));
318
rc = gpgme_new(&(mc.ctx));
357
319
if(rc != GPG_ERR_NO_ERROR){
358
320
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
361
323
return false;
362
324
}
363
325
372
334
* Decrypt OpenPGP data.
373
335
* Returns -1 on error
374
336
*/
375
__attribute__((nonnull, warn_unused_result))
376
337
static ssize_t pgp_packet_decrypt(const char *cryptotext,
377
338
size_t crypto_size,
378
char **plaintext,
379
mandos_context *mc){
339
char **plaintext){
380
340
gpgme_data_t dh_crypto, dh_plain;
381
341
gpgme_error_t rc;
382
342
ssize_t ret;
392
352
0);
393
353
if(rc != GPG_ERR_NO_ERROR){
394
354
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
355
gpgme_strsource(rc), gpgme_strerror(rc));
396
356
return -1;
397
357
}
398
358
400
360
rc = gpgme_data_new(&dh_plain);
401
361
if(rc != GPG_ERR_NO_ERROR){
402
362
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
405
365
gpgme_data_release(dh_crypto);
406
366
return -1;
407
367
}
408
368
409
369
/* Decrypt data from the cryptotext data buffer to the plaintext
410
370
data buffer */
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
372
if(rc != GPG_ERR_NO_ERROR){
413
373
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
374
gpgme_strsource(rc), gpgme_strerror(rc));
415
375
plaintext_length = -1;
416
376
if(debug){
417
377
gpgme_decrypt_result_t result;
418
result = gpgme_op_decrypt_result(mc->ctx);
378
result = gpgme_op_decrypt_result(mc.ctx);
419
379
if(result == NULL){
420
380
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
421
381
} else {
422
382
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
383
result->unsupported_algorithm);
424
384
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
385
result->wrong_key_usage);
426
386
if(result->file_name != NULL){
427
387
fprintf_plus(stderr, "File name: %s\n", result->file_name);
428
388
}
430
390
recipient = result->recipients;
431
391
while(recipient != NULL){
432
392
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
435
394
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
395
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
438
? "No" : "Yes");
396
recipient->status == GPG_ERR_NO_SECKEY
397
? "No" : "Yes");
439
398
recipient = recipient->next;
440
399
}
441
400
}
498
457
return plaintext_length;
499
458
}
500
459
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
460
static const char * safer_gnutls_strerror(int value){
461
const char *ret = gnutls_strerror(value); /* Spurious warning from
462
-Wunreachable-code */
463
if(ret == NULL)
464
ret = "(unknown)";
465
return ret;
512
466
}
513
467
514
468
/* GnuTLS log function callback */
515
__attribute__((nonnull))
516
469
static void debuggnutls(__attribute__((unused)) int level,
517
470
const char* string){
518
471
fprintf_plus(stderr, "GnuTLS: %s", string);
519
472
}
520
473
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
474
static int init_gnutls_global(const char *pubkeyfilename,
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
475
const char *seckeyfilename){
526
476
int ret;
527
unsigned int uret;
528
477
529
478
if(debug){
530
479
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
480
}
532
481
482
ret = gnutls_global_init();
483
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
485
return -1;
486
}
487
533
488
if(debug){
534
489
/* "Use a log level over 10 to enable all debugging options."
535
490
* - GnuTLS manual
539
494
}
540
495
541
496
/* OpenPGP credentials */
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
498
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
500
gnutls_global_deinit();
546
501
return -1;
547
502
}
548
503
549
504
if(debug){
550
505
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
552
pubkeyfilename,
553
seckeyfilename);
506
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
507
seckeyfilename);
554
508
}
555
509
556
510
ret = gnutls_certificate_set_openpgp_key_file
557
(mc->cred, pubkeyfilename, seckeyfilename,
511
(mc.cred, pubkeyfilename, seckeyfilename,
558
512
GNUTLS_OPENPGP_FMT_BASE64);
559
513
if(ret != GNUTLS_E_SUCCESS){
560
514
fprintf_plus(stderr,
561
515
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
516
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
565
518
goto globalfail;
566
519
}
567
520
568
521
/* GnuTLS server initialization */
569
ret = gnutls_dh_params_init(&mc->dh_params);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
574
goto globalfail;
575
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
} while(false);
630
}
631
if(dhparamsfilename == NULL){
632
if(mc->dh_bits == 0){
633
/* Find out the optimal number of DH bits */
634
/* Try to read the private key file */
635
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
do {
637
int secfile = open(seckeyfilename, O_RDONLY);
638
if(secfile == -1){
639
perror_plus("open");
640
break;
641
}
642
size_t buffer_capacity = 0;
643
while(true){
644
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer.size,
646
(size_t)buffer_capacity);
647
if(buffer_capacity == 0){
648
perror_plus("incbuffer");
649
free(buffer.data);
650
buffer.data = NULL;
651
break;
652
}
653
ssize_t bytes_read = read(secfile,
654
buffer.data + buffer.size,
655
BUFFER_SIZE);
656
/* EOF */
657
if(bytes_read == 0){
658
break;
659
}
660
/* check bytes_read for failure */
661
if(bytes_read < 0){
662
perror_plus("read");
663
free(buffer.data);
664
buffer.data = NULL;
665
break;
666
}
667
buffer.size += (unsigned int)bytes_read;
668
}
669
close(secfile);
670
} while(false);
671
/* If successful, use buffer to parse private key */
672
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
673
if(buffer.data != NULL){
674
{
675
gnutls_openpgp_privkey_t privkey = NULL;
676
ret = gnutls_openpgp_privkey_init(&privkey);
677
if(ret != GNUTLS_E_SUCCESS){
678
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
" structure: %s",
680
safer_gnutls_strerror(ret));
681
free(buffer.data);
682
buffer.data = NULL;
683
} else {
684
ret = gnutls_openpgp_privkey_import
685
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
686
if(ret != GNUTLS_E_SUCCESS){
687
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
688
safer_gnutls_strerror(ret));
689
privkey = NULL;
690
}
691
free(buffer.data);
692
buffer.data = NULL;
693
if(privkey != NULL){
694
/* Use private key to suggest an appropriate
695
sec_param */
696
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
697
gnutls_openpgp_privkey_deinit(privkey);
698
if(debug){
699
fprintf_plus(stderr, "This OpenPGP key implies using"
700
" a GnuTLS security parameter \"%s\".\n",
701
safe_string(gnutls_sec_param_get_name
702
(sec_param)));
703
}
704
}
705
}
706
}
707
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
708
/* Err on the side of caution */
709
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
if(debug){
711
fprintf_plus(stderr, "Falling back to security parameter"
712
" \"%s\"\n",
713
safe_string(gnutls_sec_param_get_name
714
(sec_param)));
715
}
716
}
717
}
718
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
719
if(uret != 0){
720
mc->dh_bits = uret;
721
if(debug){
722
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
723
" implies %u DH bits; using that.\n",
724
safe_string(gnutls_sec_param_get_name
725
(sec_param)),
726
mc->dh_bits);
727
}
728
} else {
729
fprintf_plus(stderr, "Failed to get implied number of DH"
730
" bits for security parameter \"%s\"): %s\n",
731
safe_string(gnutls_sec_param_get_name
732
(sec_param)),
733
safer_gnutls_strerror(ret));
734
goto globalfail;
735
}
736
} else if(debug){
737
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
738
mc->dh_bits);
739
}
740
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
743
" bits): %s\n", mc->dh_bits,
744
safer_gnutls_strerror(ret));
745
goto globalfail;
746
}
747
}
748
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
522
ret = gnutls_dh_params_init(&mc.dh_params);
523
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
525
" %s\n", safer_gnutls_strerror(ret));
526
goto globalfail;
527
}
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
531
safer_gnutls_strerror(ret));
532
goto globalfail;
533
}
534
535
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
749
536
750
537
return 0;
751
538
752
539
globalfail:
753
540
754
gnutls_certificate_free_credentials(mc->cred);
755
gnutls_dh_params_deinit(mc->dh_params);
541
gnutls_certificate_free_credentials(mc.cred);
542
gnutls_global_deinit();
543
gnutls_dh_params_deinit(mc.dh_params);
756
544
return -1;
757
545
}
758
546
759
__attribute__((nonnull, warn_unused_result))
760
static int init_gnutls_session(gnutls_session_t *session,
761
mandos_context *mc){
547
static int init_gnutls_session(gnutls_session_t *session){
762
548
int ret;
763
549
/* GnuTLS session creation */
764
550
do {
768
554
}
769
555
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
770
556
if(ret != GNUTLS_E_SUCCESS){
771
fprintf_plus(stderr,
772
"Error in GnuTLS session initialization: %s\n",
773
safer_gnutls_strerror(ret));
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
558
safer_gnutls_strerror(ret));
774
559
}
775
560
776
561
{
777
562
const char *err;
778
563
do {
779
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
564
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
780
565
if(quit_now){
781
566
gnutls_deinit(*session);
782
567
return -1;
784
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
785
570
if(ret != GNUTLS_E_SUCCESS){
786
571
fprintf_plus(stderr, "Syntax error at: %s\n", err);
787
fprintf_plus(stderr, "GnuTLS error: %s\n",
788
safer_gnutls_strerror(ret));
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
789
573
gnutls_deinit(*session);
790
574
return -1;
791
575
}
793
577
794
578
do {
795
579
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
796
mc->cred);
580
mc.cred);
797
581
if(quit_now){
798
582
gnutls_deinit(*session);
799
583
return -1;
801
585
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
802
586
if(ret != GNUTLS_E_SUCCESS){
803
587
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
804
safer_gnutls_strerror(ret));
588
safer_gnutls_strerror(ret));
805
589
gnutls_deinit(*session);
806
590
return -1;
807
591
}
809
593
/* ignore client certificate if any. */
810
594
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
811
595
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
597
812
598
return 0;
813
599
}
814
600
816
602
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
817
603
__attribute__((unused)) const char *txt){}
818
604
819
/* Set effective uid to 0, return errno */
820
__attribute__((warn_unused_result))
821
int raise_privileges(void){
822
int old_errno = errno;
823
int ret = 0;
824
if(seteuid(0) == -1){
825
ret = errno;
826
}
827
errno = old_errno;
828
return ret;
829
}
830
831
/* Set effective and real user ID to 0. Return errno. */
832
__attribute__((warn_unused_result))
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
836
if(ret != 0){
837
errno = old_errno;
838
return ret;
839
}
840
if(setuid(0) == -1){
841
ret = errno;
842
}
843
errno = old_errno;
844
return ret;
845
}
846
847
/* Set effective user ID to unprivileged saved user ID */
848
__attribute__((warn_unused_result))
849
int lower_privileges(void){
850
int old_errno = errno;
851
int ret = 0;
852
if(seteuid(uid) == -1){
853
ret = errno;
854
}
855
errno = old_errno;
856
return ret;
857
}
858
859
/* Lower privileges permanently */
860
__attribute__((warn_unused_result))
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
863
int ret = 0;
864
if(setuid(uid) == -1){
865
ret = errno;
866
}
867
errno = old_errno;
868
return ret;
869
}
870
871
/* Helper function to add_local_route() and delete_local_route() */
872
__attribute__((nonnull, warn_unused_result))
873
static bool add_delete_local_route(const bool add,
874
const char *address,
875
AvahiIfIndex if_index){
876
int ret;
877
char helper[] = "mandos-client-iprouteadddel";
878
char add_arg[] = "add";
879
char delete_arg[] = "delete";
880
char debug_flag[] = "--debug";
881
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
882
if(pluginhelperdir == NULL){
883
if(debug){
884
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
885
" variable not set; cannot run helper\n");
886
}
887
return false;
888
}
889
890
char interface[IF_NAMESIZE];
891
if(if_indextoname((unsigned int)if_index, interface) == NULL){
892
perror_plus("if_indextoname");
893
return false;
894
}
895
896
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
if(devnull == -1){
898
perror_plus("open(\"/dev/null\", O_RDONLY)");
899
return false;
900
}
901
pid_t pid = fork();
902
if(pid == 0){
903
/* Child */
904
/* Raise privileges */
905
errno = raise_privileges_permanently();
906
if(errno != 0){
907
perror_plus("Failed to raise privileges");
908
/* _exit(EX_NOPERM); */
909
} else {
910
/* Set group */
911
errno = 0;
912
ret = setgid(0);
913
if(ret == -1){
914
perror_plus("setgid");
915
_exit(EX_NOPERM);
916
}
917
/* Reset supplementary groups */
918
errno = 0;
919
ret = setgroups(0, NULL);
920
if(ret == -1){
921
perror_plus("setgroups");
922
_exit(EX_NOPERM);
923
}
924
}
925
ret = dup2(devnull, STDIN_FILENO);
926
if(ret == -1){
927
perror_plus("dup2(devnull, STDIN_FILENO)");
928
_exit(EX_OSERR);
929
}
930
ret = close(devnull);
931
if(ret == -1){
932
perror_plus("close");
933
_exit(EX_OSERR);
934
}
935
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
if(ret == -1){
937
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
938
_exit(EX_OSERR);
939
}
940
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
941
O_RDONLY
942
| O_DIRECTORY
943
| O_PATH
944
| O_CLOEXEC));
945
if(helperdir_fd == -1){
946
perror_plus("open");
947
_exit(EX_UNAVAILABLE);
948
}
949
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
950
helper, O_RDONLY));
951
if(helper_fd == -1){
952
perror_plus("openat");
953
close(helperdir_fd);
954
_exit(EX_UNAVAILABLE);
955
}
956
close(helperdir_fd);
957
#ifdef __GNUC__
958
#pragma GCC diagnostic push
959
#pragma GCC diagnostic ignored "-Wcast-qual"
960
#endif
961
if(fexecve(helper_fd, (char *const [])
962
{ helper, add ? add_arg : delete_arg, (char *)address,
963
interface, debug ? debug_flag : NULL, NULL },
964
environ) == -1){
965
#ifdef __GNUC__
966
#pragma GCC diagnostic pop
967
#endif
968
perror_plus("fexecve");
969
_exit(EXIT_FAILURE);
970
}
971
}
972
if(pid == -1){
973
perror_plus("fork");
974
return false;
975
}
976
int status;
977
pid_t pret = -1;
978
errno = 0;
979
do {
980
pret = waitpid(pid, &status, 0);
981
if(pret == -1 and errno == EINTR and quit_now){
982
int errno_raising = 0;
983
if((errno = raise_privileges()) != 0){
984
errno_raising = errno;
985
perror_plus("Failed to raise privileges in order to"
986
" kill helper program");
987
}
988
if(kill(pid, SIGTERM) == -1){
989
perror_plus("kill");
990
}
991
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
992
perror_plus("Failed to lower privileges after killing"
993
" helper program");
994
}
995
return false;
996
}
997
} while(pret == -1 and errno == EINTR);
998
if(pret == -1){
999
perror_plus("waitpid");
1000
return false;
1001
}
1002
if(WIFEXITED(status)){
1003
if(WEXITSTATUS(status) != 0){
1004
fprintf_plus(stderr, "Error: iprouteadddel exited"
1005
" with status %d\n", WEXITSTATUS(status));
1006
return false;
1007
}
1008
return true;
1009
}
1010
if(WIFSIGNALED(status)){
1011
fprintf_plus(stderr, "Error: iprouteadddel died by"
1012
" signal %d\n", WTERMSIG(status));
1013
return false;
1014
}
1015
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1016
return false;
1017
}
1018
1019
__attribute__((nonnull, warn_unused_result))
1020
static bool add_local_route(const char *address,
1021
AvahiIfIndex if_index){
1022
if(debug){
1023
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
}
1025
return add_delete_local_route(true, address, if_index);
1026
}
1027
1028
__attribute__((nonnull, warn_unused_result))
1029
static bool delete_local_route(const char *address,
1030
AvahiIfIndex if_index){
1031
if(debug){
1032
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
}
1034
return add_delete_local_route(false, address, if_index);
1035
}
1036
1037
605
/* Called when a Mandos server is found */
1038
__attribute__((nonnull, warn_unused_result))
1039
static int start_mandos_communication(const char *ip, in_port_t port,
606
static int start_mandos_communication(const char *ip, uint16_t port,
1040
607
AvahiIfIndex if_index,
1041
int af, mandos_context *mc){
608
int af){
1042
609
int ret, tcp_sd = -1;
1043
610
ssize_t sret;
1044
struct sockaddr_storage to;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
1045
615
char *buffer = NULL;
1046
616
char *decrypted_buffer = NULL;
1047
617
size_t buffer_length = 0;
1050
620
int retval = -1;
1051
621
gnutls_session_t session;
1052
622
int pf; /* Protocol family */
1053
bool route_added = false;
1054
623
1055
624
errno = 0;
1056
625
1072
641
return -1;
1073
642
}
1074
643
1075
/* If the interface is specified and we have a list of interfaces */
1076
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1077
/* Check if the interface is one of the interfaces we are using */
1078
bool match = false;
1079
{
1080
char *interface = NULL;
1081
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
interface))){
1083
if(if_nametoindex(interface) == (unsigned int)if_index){
1084
match = true;
1085
break;
1086
}
1087
}
1088
}
1089
if(not match){
1090
/* This interface does not match any in the list, so we don't
1091
connect to the server */
1092
if(debug){
1093
char interface[IF_NAMESIZE];
1094
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1095
perror_plus("if_indextoname");
1096
} else {
1097
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
" \"%s\"\n",
1099
if_indextoname((unsigned int)if_index,
1100
interface));
1101
}
1102
}
1103
return -1;
1104
}
1105
}
1106
1107
ret = init_gnutls_session(&session, mc);
644
ret = init_gnutls_session(&session);
1108
645
if(ret != 0){
1109
646
return -1;
1110
647
}
1111
648
1112
649
if(debug){
1113
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1114
PRIuMAX "\n", ip, (uintmax_t)port);
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
1115
652
}
1116
653
1117
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
1118
655
if(tcp_sd < 0){
1119
656
int e = errno;
1120
657
perror_plus("socket");
1127
664
goto mandos_end;
1128
665
}
1129
666
667
memset(&to, 0, sizeof(to));
1130
668
if(af == AF_INET6){
1131
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1132
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1133
ret = inet_pton(af, ip, &to6->sin6_addr);
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1134
671
} else { /* IPv4 */
1135
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1136
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to4->sin_addr);
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
674
}
1139
675
if(ret < 0 ){
1140
676
int e = errno;
1149
685
goto mandos_end;
1150
686
}
1151
687
if(af == AF_INET6){
1152
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1153
if(IN6_IS_ADDR_LINKLOCAL
1154
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
1155
695
if(if_index == AVAHI_IF_UNSPEC){
1156
fprintf_plus(stderr, "An IPv6 link-local address is"
1157
" incomplete without a network interface\n");
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
1158
698
errno = EINVAL;
1159
699
goto mandos_end;
1160
700
}
1161
701
/* Set the network interface number as scope */
1162
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
702
to.in6.sin6_scope_id = (uint32_t)if_index;
1163
703
}
1164
704
} else {
1165
((struct sockaddr_in *)&to)->sin_port = htons(port);
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
1166
708
}
1167
709
1168
710
if(quit_now){
1176
718
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
719
perror_plus("if_indextoname");
1178
720
} else {
1179
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1180
"\n", ip, interface, (uintmax_t)port);
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
1181
723
}
1182
724
} else {
1183
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1184
ip, (uintmax_t)port);
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
1185
726
}
1186
727
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1187
728
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1188
if(af == AF_INET6){
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in6),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
} else {
1194
ret = getnameinfo((struct sockaddr *)&to,
1195
sizeof(struct sockaddr_in),
1196
addrstr, sizeof(addrstr), NULL, 0,
1197
NI_NUMERICHOST);
1198
}
1199
if(ret == EAI_SYSTEM){
1200
perror_plus("getnameinfo");
1201
} else if(ret != 0) {
1202
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1203
} else if(strcmp(addrstr, ip) != 0){
1204
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1205
}
1206
}
1207
1208
if(quit_now){
1209
errno = EINTR;
1210
goto mandos_end;
1211
}
1212
1213
while(true){
1214
if(af == AF_INET6){
1215
ret = connect(tcp_sd, (struct sockaddr *)&to,
1216
sizeof(struct sockaddr_in6));
1217
} else {
1218
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1219
sizeof(struct sockaddr_in));
1220
}
1221
if(ret < 0){
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1223
and if_index != AVAHI_IF_UNSPEC
1224
and connect_to == NULL
1225
and not route_added and
1226
((af == AF_INET6 and not
1227
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
&to)->sin6_addr)))
1229
or (af == AF_INET and
1230
/* Not a a IPv4LL address */
1231
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1232
& 0xFFFF0000L) != 0xA9FE0000L))){
1233
/* Work around Avahi bug - Avahi does not announce link-local
1234
addresses if it has a global address, so local hosts with
1235
*only* a link-local address (e.g. Mandos clients) cannot
1236
connect to a Mandos server announced by Avahi on a server
1237
host with a global address. Work around this by retrying
1238
with an explicit route added with the server's address.
1239
1240
Avahi bug reference:
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://bugs.debian.org/587961
1243
*/
1244
if(debug){
1245
fprintf_plus(stderr, "Mandos server unreachable, trying"
1246
" direct route\n");
1247
}
1248
int e = errno;
1249
route_added = add_local_route(ip, if_index);
1250
if(route_added){
1251
continue;
1252
}
1253
errno = e;
1254
}
1255
if(errno != ECONNREFUSED or debug){
1256
int e = errno;
1257
perror_plus("connect");
1258
errno = e;
1259
}
1260
goto mandos_end;
1261
}
1262
1263
if(quit_now){
1264
errno = EINTR;
1265
goto mandos_end;
1266
}
1267
break;
729
const char *pcret;
730
if(af == AF_INET6){
731
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
732
sizeof(addrstr));
733
} else {
734
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
735
sizeof(addrstr));
736
}
737
if(pcret == NULL){
738
perror_plus("inet_ntop");
739
} else {
740
if(strcmp(addrstr, ip) != 0){
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
742
}
743
}
744
}
745
746
if(quit_now){
747
errno = EINTR;
748
goto mandos_end;
749
}
750
751
if(af == AF_INET6){
752
ret = connect(tcp_sd, &to.in6, sizeof(to));
753
} else {
754
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
755
}
756
if(ret < 0){
757
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
int e = errno;
759
perror_plus("connect");
760
errno = e;
761
}
762
goto mandos_end;
763
}
764
765
if(quit_now){
766
errno = EINTR;
767
goto mandos_end;
1268
768
}
1269
769
1270
770
const char *out = mandos_protocol_version;
1306
806
goto mandos_end;
1307
807
}
1308
808
1309
/* This casting via intptr_t is to eliminate warning about casting
1310
an int to a pointer type. This is exactly how the GnuTLS Guile
1311
function "set-session-transport-fd!" does it. */
1312
gnutls_transport_set_ptr(session,
1313
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
809
/* Spurious warning from -Wint-to-pointer-cast */
810
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1314
811
1315
812
if(quit_now){
1316
813
errno = EINTR;
1337
834
/* Read OpenPGP packet that contains the wanted password */
1338
835
1339
836
if(debug){
1340
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1341
" %s\n", ip);
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
1342
838
}
1343
839
1344
840
while(true){
1382
878
}
1383
879
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1384
880
if(ret < 0){
1385
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1386
"***\n");
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
1387
882
gnutls_perror(ret);
1388
883
errno = EPROTO;
1389
884
goto mandos_end;
1391
886
break;
1392
887
default:
1393
888
fprintf_plus(stderr, "Unknown error while reading data from"
1394
" encrypted session with Mandos server\n");
889
" encrypted session with Mandos server\n");
1395
890
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1396
891
errno = EIO;
1397
892
goto mandos_end;
1421
916
if(buffer_length > 0){
1422
917
ssize_t decrypted_buffer_size;
1423
918
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1424
&decrypted_buffer, mc);
919
&decrypted_buffer);
1425
920
if(decrypted_buffer_size >= 0){
1426
921
1427
clearerr(stdout);
1428
922
written = 0;
1429
923
while(written < (size_t) decrypted_buffer_size){
1430
924
if(quit_now){
1439
933
int e = errno;
1440
934
if(debug){
1441
935
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1442
strerror(errno));
936
strerror(errno));
1443
937
}
1444
938
errno = e;
1445
939
goto mandos_end;
1446
940
}
1447
941
written += (size_t)ret;
1448
942
}
1449
ret = fflush(stdout);
1450
if(ret != 0){
1451
int e = errno;
1452
if(debug){
1453
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1454
strerror(errno));
1455
}
1456
errno = e;
1457
goto mandos_end;
1458
}
1459
943
retval = 0;
1460
944
}
1461
945
}
1464
948
1465
949
mandos_end:
1466
950
{
1467
if(route_added){
1468
if(not delete_local_route(ip, if_index)){
1469
fprintf_plus(stderr, "Failed to delete local route to %s on"
1470
" interface %d", ip, if_index);
1471
}
1472
}
1473
951
int e = errno;
1474
952
free(decrypted_buffer);
1475
953
free(buffer);
1476
954
if(tcp_sd >= 0){
1477
ret = close(tcp_sd);
955
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1478
956
}
1479
957
if(ret == -1){
1480
958
if(e == 0){
1492
970
return retval;
1493
971
}
1494
972
1495
__attribute__((nonnull))
1496
973
static void resolve_callback(AvahiSServiceResolver *r,
1497
974
AvahiIfIndex interface,
1498
975
AvahiProtocol proto,
1506
983
AVAHI_GCC_UNUSED AvahiStringList *txt,
1507
984
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1508
985
flags,
1509
void *mc){
1510
if(r == NULL){
1511
return;
1512
}
986
AVAHI_GCC_UNUSED void* userdata){
987
assert(r);
1513
988
1514
989
/* Called whenever a service has been resolved successfully or
1515
990
timed out */
1516
991
1517
992
if(quit_now){
1518
avahi_s_service_resolver_free(r);
1519
993
return;
1520
994
}
1521
995
1522
996
switch(event){
1523
997
default:
1524
998
case AVAHI_RESOLVER_FAILURE:
1525
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1526
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1527
domain,
1528
avahi_strerror(avahi_server_errno
1529
(((mandos_context*)mc)->server)));
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1000
" of type '%s' in domain '%s': %s\n", name, type, domain,
1001
avahi_strerror(avahi_server_errno(mc.server)));
1530
1002
break;
1531
1003
1532
1004
case AVAHI_RESOLVER_FOUND:
1535
1007
avahi_address_snprint(ip, sizeof(ip), address);
1536
1008
if(debug){
1537
1009
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1538
PRIdMAX ") on port %" PRIu16 "\n", name,
1539
host_name, ip, (intmax_t)interface, port);
1010
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
ip, (intmax_t)interface, port);
1540
1012
}
1541
int ret = start_mandos_communication(ip, (in_port_t)port,
1542
interface,
1543
avahi_proto_to_af(proto),
1544
mc);
1013
int ret = start_mandos_communication(ip, port, interface,
1014
avahi_proto_to_af(proto));
1545
1015
if(ret == 0){
1546
avahi_simple_poll_quit(simple_poll);
1016
avahi_simple_poll_quit(mc.simple_poll);
1547
1017
} else {
1548
if(not add_server(ip, (in_port_t)port, interface,
1549
avahi_proto_to_af(proto),
1550
&((mandos_context*)mc)->current_server)){
1551
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1552
" list\n", name);
1553
}
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
1554
1020
}
1555
1021
}
1556
1022
}
1566
1032
const char *domain,
1567
1033
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1568
1034
flags,
1569
void *mc){
1570
if(b == NULL){
1571
return;
1572
}
1035
AVAHI_GCC_UNUSED void* userdata){
1036
assert(b);
1573
1037
1574
1038
/* Called whenever a new services becomes available on the LAN or
1575
1039
is removed from the LAN */
1583
1047
case AVAHI_BROWSER_FAILURE:
1584
1048
1585
1049
fprintf_plus(stderr, "(Avahi browser) %s\n",
1586
avahi_strerror(avahi_server_errno
1587
(((mandos_context*)mc)->server)));
1588
avahi_simple_poll_quit(simple_poll);
1050
avahi_strerror(avahi_server_errno(mc.server)));
1051
avahi_simple_poll_quit(mc.simple_poll);
1589
1052
return;
1590
1053
1591
1054
case AVAHI_BROWSER_NEW:
1594
1057
the callback function is called the Avahi server will free the
1595
1058
resolver for us. */
1596
1059
1597
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1598
interface, protocol, name, type,
1599
domain, protocol, 0,
1600
resolve_callback, mc) == NULL)
1601
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1602
" %s\n", name,
1603
avahi_strerror(avahi_server_errno
1604
(((mandos_context*)mc)->server)));
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
name, type, domain, protocol, 0,
1062
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
1605
1065
break;
1606
1066
1607
1067
case AVAHI_BROWSER_REMOVE:
1610
1070
case AVAHI_BROWSER_ALL_FOR_NOW:
1611
1071
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1612
1072
if(debug){
1613
fprintf_plus(stderr, "No Mandos server found, still"
1614
" searching...\n");
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
1615
1074
}
1616
1075
break;
1617
1076
}
1626
1085
signal_received = sig;
1627
1086
int old_errno = errno;
1628
1087
/* set main loop to exit */
1629
if(simple_poll != NULL){
1630
avahi_simple_poll_quit(simple_poll);
1088
if(mc.simple_poll != NULL){
1089
avahi_simple_poll_quit(mc.simple_poll);
1631
1090
}
1632
1091
errno = old_errno;
1633
1092
}
1634
1093
1635
__attribute__((nonnull, warn_unused_result))
1636
1094
bool get_flags(const char *ifname, struct ifreq *ifr){
1637
1095
int ret;
1638
int old_errno;
1639
1096
1640
1097
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1641
1098
if(s < 0){
1642
old_errno = errno;
1643
1099
perror_plus("socket");
1644
errno = old_errno;
1645
1100
return false;
1646
1101
}
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1102
strcpy(ifr->ifr_name, ifname);
1649
1103
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1650
1104
if(ret == -1){
1651
1105
if(debug){
1652
old_errno = errno;
1653
1106
perror_plus("ioctl SIOCGIFFLAGS");
1654
errno = old_errno;
1655
1107
}
1656
1108
return false;
1657
1109
}
1658
1110
return true;
1659
1111
}
1660
1112
1661
__attribute__((nonnull, warn_unused_result))
1662
1113
bool good_flags(const char *ifname, const struct ifreq *ifr){
1663
1114
1664
1115
/* Reject the loopback device */
1665
1116
if(ifr->ifr_flags & IFF_LOOPBACK){
1666
1117
if(debug){
1667
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1668
ifname);
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1669
1119
}
1670
1120
return false;
1671
1121
}
1672
1122
/* Accept point-to-point devices only if connect_to is specified */
1673
1123
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1674
1124
if(debug){
1675
fprintf_plus(stderr, "Accepting point-to-point interface"
1676
" \"%s\"\n", ifname);
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1677
1126
}
1678
1127
return true;
1679
1128
}
1680
1129
/* Otherwise, reject non-broadcast-capable devices */
1681
1130
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1682
1131
if(debug){
1683
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1684
" \"%s\"\n", ifname);
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1685
1133
}
1686
1134
return false;
1687
1135
}
1688
1136
/* Reject non-ARP interfaces (including dummy interfaces) */
1689
1137
if(ifr->ifr_flags & IFF_NOARP){
1690
1138
if(debug){
1691
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1692
ifname);
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1693
1140
}
1694
1141
return false;
1695
1142
}
1706
1153
* corresponds to an acceptable network device.
1707
1154
* (This function is passed to scandir(3) as a filter function.)
1708
1155
*/
1709
__attribute__((nonnull, warn_unused_result))
1710
1156
int good_interface(const struct dirent *if_entry){
1711
1157
if(if_entry->d_name[0] == '.'){
1712
1158
return 0;
1715
1161
struct ifreq ifr;
1716
1162
if(not get_flags(if_entry->d_name, &ifr)){
1717
1163
if(debug){
1718
fprintf_plus(stderr, "Failed to get flags for interface "
1719
"\"%s\"\n", if_entry->d_name);
1720
}
1721
return 0;
1722
}
1723
1724
if(not good_flags(if_entry->d_name, &ifr)){
1725
return 0;
1726
}
1727
return 1;
1728
}
1729
1730
/*
1731
* This function determines if a network interface is up.
1732
*/
1733
__attribute__((nonnull, warn_unused_result))
1734
bool interface_is_up(const char *interface){
1735
struct ifreq ifr;
1736
if(not get_flags(interface, &ifr)){
1737
if(debug){
1738
fprintf_plus(stderr, "Failed to get flags for interface "
1739
"\"%s\"\n", interface);
1740
}
1741
return false;
1742
}
1743
1744
return (bool)(ifr.ifr_flags & IFF_UP);
1745
}
1746
1747
/*
1748
* This function determines if a network interface is running
1749
*/
1750
__attribute__((nonnull, warn_unused_result))
1751
bool interface_is_running(const char *interface){
1752
struct ifreq ifr;
1753
if(not get_flags(interface, &ifr)){
1754
if(debug){
1755
fprintf_plus(stderr, "Failed to get flags for interface "
1756
"\"%s\"\n", interface);
1757
}
1758
return false;
1759
}
1760
1761
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1762
}
1763
1764
__attribute__((nonnull, pure, warn_unused_result))
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1217
}
1218
1765
1219
int notdotentries(const struct dirent *direntry){
1766
1220
/* Skip "." and ".." */
1767
1221
if(direntry->d_name[0] == '.'
1774
1228
}
1775
1229
1776
1230
/* Is this directory entry a runnable program? */
1777
__attribute__((nonnull, warn_unused_result))
1778
1231
int runnable_hook(const struct dirent *direntry){
1779
1232
int ret;
1780
1233
size_t sret;
1788
1241
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1789
1242
"abcdefghijklmnopqrstuvwxyz"
1790
1243
"0123456789"
1791
"_.-");
1244
"_-");
1792
1245
if((direntry->d_name)[sret] != '\0'){
1793
1246
/* Contains non-allowed characters */
1794
1247
if(debug){
1795
1248
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1796
direntry->d_name);
1249
direntry->d_name);
1797
1250
}
1798
1251
return 0;
1799
1252
}
1800
1253
1801
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1254
char *fullname = NULL;
1255
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1256
if(ret < 0){
1257
perror_plus("asprintf");
1258
return 0;
1259
}
1260
1261
ret = stat(fullname, &st);
1802
1262
if(ret == -1){
1803
1263
if(debug){
1804
1264
perror_plus("Could not stat hook");
1809
1269
/* Not a regular file */
1810
1270
if(debug){
1811
1271
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1812
direntry->d_name);
1272
direntry->d_name);
1813
1273
}
1814
1274
return 0;
1815
1275
}
1817
1277
/* Not executable */
1818
1278
if(debug){
1819
1279
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1820
direntry->d_name);
1280
direntry->d_name);
1821
1281
}
1822
1282
return 0;
1823
1283
}
1824
if(debug){
1825
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1826
direntry->d_name);
1827
}
1828
1284
return 1;
1829
1285
}
1830
1286
1831
__attribute__((nonnull, warn_unused_result))
1832
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1833
mandos_context *mc){
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1834
1288
int ret;
1835
1289
struct timespec now;
1836
1290
struct timespec waited_time;
1837
1291
intmax_t block_time;
1838
1292
1839
1293
while(true){
1840
if(mc->current_server == NULL){
1841
if(debug){
1842
fprintf_plus(stderr, "Wait until first server is found."
1843
" No timeout!\n");
1294
if(mc.current_server == NULL){
1295
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
1844
1297
}
1845
1298
ret = avahi_simple_poll_iterate(s, -1);
1846
1299
} else {
1847
if(debug){
1848
fprintf_plus(stderr, "Check current_server if we should run"
1849
" it, or wait\n");
1300
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
1850
1303
}
1851
1304
/* the current time */
1852
1305
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1857
1310
/* Calculating in ms how long time between now and server
1858
1311
who we visted longest time ago. Now - last seen. */
1859
1312
waited_time.tv_sec = (now.tv_sec
1860
- mc->current_server->last_seen.tv_sec);
1313
- mc.current_server->last_seen.tv_sec);
1861
1314
waited_time.tv_nsec = (now.tv_nsec
1862
- mc->current_server->last_seen.tv_nsec);
1315
- mc.current_server->last_seen.tv_nsec);
1863
1316
/* total time is 10s/10,000ms.
1864
1317
Converting to s from ms by dividing by 1,000,
1865
1318
and ns to ms by dividing by 1,000,000. */
1867
1320
- ((intmax_t)waited_time.tv_sec * 1000))
1868
1321
- ((intmax_t)waited_time.tv_nsec / 1000000));
1869
1322
1870
if(debug){
1871
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1872
block_time);
1323
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1873
1325
}
1874
1326
1875
1327
if(block_time <= 0){
1876
ret = start_mandos_communication(mc->current_server->ip,
1877
mc->current_server->port,
1878
mc->current_server->if_index,
1879
mc->current_server->af, mc);
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
1880
1332
if(ret == 0){
1881
avahi_simple_poll_quit(s);
1333
avahi_simple_poll_quit(mc.simple_poll);
1882
1334
return 0;
1883
1335
}
1884
1336
ret = clock_gettime(CLOCK_MONOTONIC,
1885
&mc->current_server->last_seen);
1337
&mc.current_server->last_seen);
1886
1338
if(ret == -1){
1887
1339
perror_plus("clock_gettime");
1888
1340
return -1;
1889
1341
}
1890
mc->current_server = mc->current_server->next;
1342
mc.current_server = mc.current_server->next;
1891
1343
block_time = 0; /* Call avahi to find new Mandos
1892
1344
servers, but don't block */
1893
1345
}
1895
1347
ret = avahi_simple_poll_iterate(s, (int)block_time);
1896
1348
}
1897
1349
if(ret != 0){
1898
if(ret > 0 or errno != EINTR){
1350
if (ret > 0 or errno != EINTR){
1899
1351
return (ret != 1) ? ret : 0;
1900
1352
}
1901
1353
}
1902
1354
}
1903
1355
}
1904
1356
1905
__attribute__((nonnull))
1906
void run_network_hooks(const char *mode, const char *interface,
1907
const float delay){
1908
struct dirent **direntries = NULL;
1909
if(hookdir_fd == -1){
1910
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
| O_CLOEXEC);
1912
if(hookdir_fd == -1){
1913
if(errno == ENOENT){
1914
if(debug){
1915
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1916
" found\n", hookdir);
1917
}
1918
} else {
1919
perror_plus("open");
1920
}
1921
return;
1922
}
1923
}
1924
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1925
runnable_hook, alphasort);
1926
if(numhooks == -1){
1927
perror_plus("scandir");
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1989
perror_plus("asprintf");
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1994
free(delaystring);
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if(close(hookdir_fd) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = close(devnull);
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
2063
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if(close(hookdir_fd) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
2083
}
2084
2085
__attribute__((nonnull, warn_unused_result))
2086
int bring_up_interface(const char *const interface,
2087
const float delay){
2088
int old_errno = errno;
2089
int ret;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2092
if(if_index == 0){
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2094
errno = old_errno;
2095
return ENXIO;
2096
}
2097
2098
if(quit_now){
2099
errno = old_errno;
2100
return EINTR;
2101
}
2102
2103
if(not interface_is_up(interface)){
2104
int ret_errno = 0;
2105
int ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2107
ret_errno = errno;
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
return ret_errno;
2112
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
2114
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
2117
ret_errno = errno;
2118
perror_plus("socket");
2119
errno = old_errno;
2120
return ret_errno;
2121
}
2122
2123
if(quit_now){
2124
ret = close(sd);
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
2128
errno = old_errno;
2129
return EINTR;
2130
}
2131
2132
if(debug){
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2134
interface);
2135
}
2136
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to raise privileges");
2142
}
2143
2144
#ifdef __linux__
2145
int ret_linux;
2146
bool restore_loglevel = false;
2147
if(ret_errno == 0){
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
} else {
2154
restore_loglevel = true;
2155
}
2156
}
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2160
#ifdef __linux__
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2165
}
2166
}
2167
#endif /* __linux__ */
2168
2169
/* If raise_privileges() succeeded above */
2170
if(ret_errno == 0){
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("Failed to lower privileges");
2176
}
2177
}
2178
2179
/* Close the socket */
2180
ret = close(sd);
2181
if(ret == -1){
2182
perror_plus("close");
2183
}
2184
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
errno = old_errno;
2189
return ioctl_errno;
2190
}
2191
} else if(debug){
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2193
interface);
2194
}
2195
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2200
break;
2201
}
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2206
}
2207
}
2208
2209
errno = old_errno;
2210
return 0;
2211
}
2212
2213
__attribute__((nonnull, warn_unused_result))
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2218
if(if_index == 0){
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2220
errno = old_errno;
2221
return ENXIO;
2222
}
2223
if(interface_is_up(interface)){
2224
int ret_errno = 0;
2225
int ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2227
ret_errno = errno;
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
2237
ret_errno = errno;
2238
perror_plus("socket");
2239
errno = old_errno;
2240
return ret_errno;
2241
}
2242
2243
if(debug){
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2245
interface);
2246
}
2247
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
int ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2282
interface);
2283
}
2284
2285
errno = old_errno;
2286
return 0;
2287
}
2288
2289
1357
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
2295
1358
AvahiSServiceBrowser *sb = NULL;
2296
error_t ret_errno;
1359
int error;
2297
1360
int ret;
2298
1361
intmax_t tmpmax;
2299
1362
char *tmp;
2300
1363
int exitcode = EXIT_SUCCESS;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1364
const char *interface = "";
1365
struct ifreq network;
1366
int sd = -1;
1367
bool take_down_interface = false;
1368
uid_t uid;
1369
gid_t gid;
1370
char tempdir[] = "/tmp/mandosXXXXXX";
1371
bool tempdir_created = false;
2306
1372
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
1373
const char *seckey = PATHDIR "/" SECKEY;
2308
1374
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
2311
1375
2312
1376
bool gnutls_initialized = false;
2313
1377
bool gpgme_initialized = false;
2365
1429
.doc = "Bit length of the prime number used in the"
2366
1430
" Diffie-Hellman key exchange",
2367
1431
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
2373
1432
{ .name = "priority", .key = 130,
2374
1433
.arg = "STRING",
2375
1434
.doc = "GnuTLS priority string for the TLS handshake",
2380
1439
.group = 2 },
2381
1440
{ .name = "retry", .key = 132,
2382
1441
.arg = "SECONDS",
2383
.doc = "Retry interval used when denied by the Mandos server",
1442
.doc = "Retry interval used when denied by the mandos server",
2384
1443
.group = 2 },
2385
1444
{ .name = "network-hook-dir", .key = 133,
2386
1445
.arg = "DIR",
2409
1468
connect_to = arg;
2410
1469
break;
2411
1470
case 'i': /* --interface */
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
1471
interface = arg;
2417
1472
break;
2418
1473
case 's': /* --seckey */
2419
1474
seckey = arg;
2430
1485
}
2431
1486
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
1487
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
2436
1488
case 130: /* --priority */
2437
1489
mc.priority = arg;
2438
1490
break;
2465
1517
argp_state_help(state, state->out_stream,
2466
1518
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2467
1519
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
2468
1521
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2469
1522
exit(argp_err_exit_status);
2470
1523
break;
2478
1531
.args_doc = "",
2479
1532
.doc = "Mandos client -- Get and decrypt"
2480
1533
" passwords from a Mandos server" };
2481
ret_errno = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret_errno){
1534
ret = argp_parse(&argp, argc, argv,
1535
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1536
switch(ret){
2484
1537
case 0:
2485
1538
break;
2486
1539
case ENOMEM:
2487
1540
default:
2488
errno = ret_errno;
1541
errno = ret;
2489
1542
perror_plus("argp_parse");
2490
1543
exitcode = EX_OSERR;
2491
1544
goto end;
2494
1547
goto end;
2495
1548
}
2496
1549
}
2497
1550
2498
1551
{
2499
1552
/* Work around Debian bug #633582:
2500
<https://bugs.debian.org/633582> */
2501
2502
/* Re-raise privileges */
2503
ret = raise_privileges();
2504
if(ret != 0){
2505
errno = ret;
2506
perror_plus("Failed to raise privileges");
1553
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1556
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
2507
1619
} else {
2508
struct stat st;
2509
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2514
} else {
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
if(ret == -1){
2517
perror_plus("fstat");
2518
} else {
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2522
if(ret == -1){
2523
perror_plus("fchown");
2524
}
2525
}
2526
}
2527
close(seckey_fd);
2528
}
2529
}
2530
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2535
} else {
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
if(ret == -1){
2538
perror_plus("fstat");
2539
} else {
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2543
if(ret == -1){
2544
perror_plus("fchown");
2545
}
2546
}
2547
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2574
/* Lower privileges */
2575
ret = lower_privileges();
2576
if(ret != 0){
2577
errno = ret;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
2596
}
2597
}
2598
}
2599
2600
/* Run network hooks */
2601
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2606
goto end;
2607
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
1700
goto end;
1701
}
1702
}
1703
close(devnull);
1704
}
2613
1705
}
2614
1706
2615
1707
if(not debug){
2616
1708
avahi_set_log_function(empty_log);
2617
1709
}
2618
1710
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1738
exitcode = EXIT_FAILURE;
1739
goto end;
1740
}
1741
}
1742
2619
1743
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2620
1744
from the signal handler */
2621
1745
/* Initialize the pseudo-RNG for Avahi */
2622
1746
srand((unsigned int) time(NULL));
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2625
fprintf_plus(stderr,
2626
"Avahi: Failed to create simple poll object.\n");
1747
mc.simple_poll = avahi_simple_poll_new();
1748
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
2627
1750
exitcode = EX_UNAVAILABLE;
2628
1751
goto end;
2629
1752
}
2691
1814
}
2692
1815
}
2693
1816
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
1817
/* If the interface is down, bring it up */
1818
if(strcmp(interface, "none") != 0){
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
1820
if(if_index == 0){
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
/* Re-raise priviliges */
1831
errno = 0;
1832
ret = seteuid(0);
1833
if(ret == -1){
1834
perror_plus("seteuid");
1835
}
1836
1837
#ifdef __linux__
1838
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1839
messages about the network interface to mess up the prompt */
1840
ret = klogctl(8, NULL, 5);
1841
bool restore_loglevel = true;
1842
if(ret == -1){
1843
restore_loglevel = false;
1844
perror_plus("klogctl");
1845
}
1846
#endif /* __linux__ */
1847
1848
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd < 0){
1850
perror_plus("socket");
1851
exitcode = EX_OSERR;
1852
#ifdef __linux__
1853
if(restore_loglevel){
1854
ret = klogctl(7, NULL, 0);
1855
if(ret == -1){
1856
perror_plus("klogctl");
1857
}
1858
}
1859
#endif /* __linux__ */
1860
/* Lower privileges */
1861
errno = 0;
1862
ret = seteuid(uid);
1863
if(ret == -1){
1864
perror_plus("seteuid");
1865
}
1866
goto end;
1867
}
1868
strcpy(network.ifr_name, interface);
1869
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1872
#ifdef __linux__
1873
if(restore_loglevel){
1874
ret = klogctl(7, NULL, 0);
1875
if(ret == -1){
1876
perror_plus("klogctl");
1877
}
1878
}
1879
#endif /* __linux__ */
1880
exitcode = EX_OSERR;
1881
/* Lower privileges */
1882
errno = 0;
1883
ret = seteuid(uid);
1884
if(ret == -1){
1885
perror_plus("seteuid");
1886
}
1887
goto end;
1888
}
1889
if((network.ifr_flags & IFF_UP) == 0){
1890
network.ifr_flags |= IFF_UP;
1891
take_down_interface = true;
1892
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
if(ret == -1){
1894
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1896
exitcode = EX_OSERR;
1897
#ifdef __linux__
1898
if(restore_loglevel){
1899
ret = klogctl(7, NULL, 0);
1900
if(ret == -1){
1901
perror_plus("klogctl");
1902
}
1903
}
1904
#endif /* __linux__ */
1905
/* Lower privileges */
1906
errno = 0;
1907
ret = seteuid(uid);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
goto end;
1912
}
1913
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1916
for(int i=0; i < delay * 4; i++){
1917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1920
} else if(network.ifr_flags & IFF_RUNNING){
1921
break;
1922
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
if(not take_down_interface){
1930
/* We won't need the socket anymore */
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
if(ret == -1){
1933
perror_plus("close");
1934
}
1935
}
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
/* Restores kernel loglevel to default */
1939
ret = klogctl(7, NULL, 0);
1940
if(ret == -1){
1941
perror_plus("klogctl");
1942
}
1943
}
1944
#endif /* __linux__ */
1945
/* Lower privileges */
1946
errno = 0;
1947
if(take_down_interface){
1948
/* Lower privileges */
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
2718
1953
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
}
2746
}
2747
break;
2748
}
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
2763
}
2764
}
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1954
/* Lower privileges permanently */
1955
ret = setuid(uid);
1956
if(ret == -1){
1957
perror_plus("setuid");
1958
}
1959
}
2777
1960
}
2778
1961
2779
1962
if(quit_now){
2780
1963
goto end;
2781
1964
}
2782
1965
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1966
ret = init_gnutls_global(pubkey, seckey);
2784
1967
if(ret == -1){
2785
1968
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
1969
exitcode = EX_UNAVAILABLE;
2793
1976
goto end;
2794
1977
}
2795
1978
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
1979
if(mkdtemp(tempdir) == NULL){
2806
1980
perror_plus("mkdtemp");
2807
1981
goto end;
2808
1982
}
1983
tempdir_created = true;
2809
1984
2810
1985
if(quit_now){
2811
1986
goto end;
2812
1987
}
2813
1988
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
2815
1990
fprintf_plus(stderr, "init_gpgme failed\n");
2816
1991
exitcode = EX_UNAVAILABLE;
2817
1992
goto end;
2827
2002
/* Connect directly, do not use Zeroconf */
2828
2003
/* (Mainly meant for debugging) */
2829
2004
char *address = strrchr(connect_to, ':');
2830
2831
2005
if(address == NULL){
2832
2006
fprintf_plus(stderr, "No colon in address\n");
2833
2007
exitcode = EX_USAGE;
2838
2012
goto end;
2839
2013
}
2840
2014
2841
in_port_t port;
2015
uint16_t port;
2842
2016
errno = 0;
2843
2017
tmpmax = strtoimax(address+1, &tmp, 10);
2844
2018
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2845
or tmpmax != (in_port_t)tmpmax){
2019
or tmpmax != (uint16_t)tmpmax){
2846
2020
fprintf_plus(stderr, "Bad port number\n");
2847
2021
exitcode = EX_USAGE;
2848
2022
goto end;
2849
2023
}
2850
2024
2851
2025
if(quit_now){
2852
2026
goto end;
2853
2027
}
2854
2028
2855
port = (in_port_t)tmpmax;
2029
port = (uint16_t)tmpmax;
2856
2030
*address = '\0';
2857
2031
/* Colon in address indicates IPv6 */
2858
2032
int af;
2874
2048
}
2875
2049
2876
2050
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2051
ret = start_mandos_communication(address, port, if_index, af);
2879
2052
if(quit_now or ret == 0){
2880
2053
break;
2881
2054
}
2882
2055
if(debug){
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
(int)retry_interval);
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2885
2057
}
2886
sleep((unsigned int)retry_interval);
2058
sleep((int)retry_interval);
2887
2059
}
2888
2060
2889
if(not quit_now){
2061
if (not quit_now){
2890
2062
exitcode = EXIT_SUCCESS;
2891
2063
}
2892
2064
2907
2079
config.publish_domain = 0;
2908
2080
2909
2081
/* Allocate a new server */
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret);
2082
mc.server = avahi_server_new(avahi_simple_poll_get
2083
(mc.simple_poll), &config, NULL,
2084
NULL, &error);
2912
2085
2913
2086
/* Free the Avahi configuration data */
2914
2087
avahi_server_config_free(&config);
2917
2090
/* Check if creating the Avahi server object succeeded */
2918
2091
if(mc.server == NULL){
2919
2092
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret));
2093
avahi_strerror(error));
2921
2094
exitcode = EX_UNAVAILABLE;
2922
2095
goto end;
2923
2096
}
2929
2102
/* Create the Avahi service browser */
2930
2103
sb = avahi_s_service_browser_new(mc.server, if_index,
2931
2104
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2105
NULL, 0, browse_callback, NULL);
2934
2106
if(sb == NULL){
2935
2107
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
avahi_strerror(avahi_server_errno(mc.server)));
2108
avahi_strerror(avahi_server_errno(mc.server)));
2937
2109
exitcode = EX_UNAVAILABLE;
2938
2110
goto end;
2939
2111
}
2947
2119
if(debug){
2948
2120
fprintf_plus(stderr, "Starting Avahi loop search\n");
2949
2121
}
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2122
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
2953
2125
if(debug){
2954
2126
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
2127
(ret == 0) ? "successfully" : "with error");
2956
2128
}
2957
2129
2958
2130
end:
2959
2131
2960
2132
if(debug){
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2965
} else {
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
}
2133
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
2134
}
2969
2135
2970
2136
/* Cleanup things */
2971
free(mc.interfaces);
2972
2973
2137
if(sb != NULL)
2974
2138
avahi_s_service_browser_free(sb);
2975
2139
2976
2140
if(mc.server != NULL)
2977
2141
avahi_server_free(mc.server);
2978
2142
2979
if(simple_poll != NULL)
2980
avahi_simple_poll_free(simple_poll);
2143
if(mc.simple_poll != NULL)
2144
avahi_simple_poll_free(mc.simple_poll);
2981
2145
2982
2146
if(gnutls_initialized){
2983
2147
gnutls_certificate_free_credentials(mc.cred);
2148
gnutls_global_deinit();
2984
2149
gnutls_dh_params_deinit(mc.dh_params);
2985
2150
}
2986
2151
2987
2152
if(gpgme_initialized){
2988
2153
gpgme_release(mc.ctx);
2989
2154
}
2990
2155
2991
2156
/* Cleans up the circular linked list of Mandos servers the client
2992
2157
has seen */
2993
2158
if(mc.current_server != NULL){
2994
2159
mc.current_server->prev->next = NULL;
2995
2160
while(mc.current_server != NULL){
2996
2161
server *next = mc.current_server->next;
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic push
2999
#pragma GCC diagnostic ignored "-Wcast-qual"
3000
#endif
3001
free((char *)(mc.current_server->ip));
3002
#ifdef __GNUC__
3003
#pragma GCC diagnostic pop
3004
#endif
3005
2162
free(mc.current_server);
3006
2163
mc.current_server = next;
3007
2164
}
3008
2165
}
3009
2166
3010
/* Re-raise privileges */
3011
{
3012
ret = raise_privileges();
3013
if(ret != 0){
3014
errno = ret;
3015
perror_plus("Failed to raise privileges");
3016
} else {
3017
3018
/* Run network hooks */
3019
run_network_hooks("stop", interfaces_hooks != NULL ?
3020
interfaces_hooks : "", delay);
3021
3022
/* Take down the network interfaces which were brought up */
3023
{
3024
char *interface = NULL;
3025
while((interface=argz_next(interfaces_to_take_down,
3026
interfaces_to_take_down_size,
3027
interface))){
3028
ret = take_down_interface(interface);
3029
if(ret != 0){
3030
errno = ret;
3031
perror_plus("Failed to take down interface");
3032
}
3033
}
3034
if(debug and (interfaces_to_take_down == NULL)){
3035
fprintf_plus(stderr, "No interfaces needed to be taken"
3036
" down\n");
3037
}
3038
}
2167
/* XXX run network hooks "stop" here */
2168
2169
/* Take down the network interface */
2170
if(take_down_interface){
2171
/* Re-raise priviliges */
2172
errno = 0;
2173
ret = seteuid(0);
2174
if(ret == -1){
2175
perror_plus("seteuid");
3039
2176
}
3040
3041
ret = lower_privileges_permanently();
3042
if(ret != 0){
3043
errno = ret;
3044
perror_plus("Failed to lower privileges permanently");
2177
if(geteuid() == 0){
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2186
}
2187
}
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
if(ret == -1){
2190
perror_plus("close");
2191
}
2192
/* Lower privileges permanently */
2193
errno = 0;
2194
ret = setuid(uid);
2195
if(ret == -1){
2196
perror_plus("setuid");
2197
}
3045
2198
}
3046
2199
}
3047
2200
3048
free(interfaces_to_take_down);
3049
free(interfaces_hooks);
3050
3051
void clean_dir_at(int base, const char * const dirname,
3052
uintmax_t level){
2201
/* Removes the GPGME temp directory and all files inside */
2202
if(tempdir_created){
3053
2203
struct dirent **direntries = NULL;
3054
int dret;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3056
O_RDONLY
3057
| O_NOFOLLOW
3058
| O_DIRECTORY
3059
| O_PATH));
3060
if(dir_fd == -1){
3061
perror_plus("open");
3062
}
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
2204
struct dirent *direntry = NULL;
2205
int numentries = scandir(tempdir, &direntries, notdotentries,
2206
alphasort);
2207
if (numentries > 0){
3066
2208
for(int i = 0; i < numentries; i++){
3067
if(debug){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3070
}
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3072
if(dret == -1){
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3075
AT_REMOVEDIR);
3076
}
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3082
dret = 0;
3083
}
3084
if(dret == -1){
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3087
}
3088
}
3089
free(direntries[i]);
3090
}
3091
3092
/* need to clean even if 0 because man page doesn't specify */
3093
free(direntries);
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3096
}
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3100
}
3101
} else {
3102
perror_plus("scandirat");
3103
}
3104
close(dir_fd);
3105
}
3106
3107
/* Removes the GPGME temp directory and all files inside */
3108
if(tempdir != NULL){
3109
clean_dir_at(-1, tempdir, 0);
2209
direntry = direntries[i];
2210
char *fullname = NULL;
2211
ret = asprintf(&fullname, "%s/%s", tempdir,
2212
direntry->d_name);
2213
if(ret < 0){
2214
perror_plus("asprintf");
2215
continue;
2216
}
2217
ret = remove(fullname);
2218
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
2220
}
2221
free(fullname);
2222
}
2223
}
2224
2225
/* need to clean even if 0 because man page doesn't specify */
2226
free(direntries);
2227
if (numentries == -1){
2228
perror_plus("scandir");
2229
}
2230
ret = rmdir(tempdir);
2231
if(ret == -1 and errno != ENOENT){
2232
perror_plus("rmdir");
2233
}
3110
2234
}
3111
2235
3112
2236
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0