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- Committer: Teddy Hogeborn
- Date: 2014-08-06 20:47:42 UTC
- mfrom: (237.7.275 trunk)
- Revision ID: teddy@recompile.se-20140806204742-tpy81dsvwt2zl975
Merge from trunk.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
85
86
raise() */
86
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
88
98
89
99
#ifdef __linux__
90
100
#include <sys/klog.h> /* klogctl() */
108
118
init_gnutls_session(),
109
119
GNUTLS_* */
110
120
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
113
123
114
124
/* GPGME */
115
125
#include <gpgme.h> /* All GPGME types, constants and
131
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
142
static const char sys_class_net[] = "/sys/class/net";
133
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
134
148
135
149
/* Doubly linked list that need to be circularly linked when used */
136
150
typedef struct server{
137
151
const char *ip;
138
uint16_t port;
152
in_port_t port;
139
153
AvahiIfIndex if_index;
140
154
int af;
141
155
struct timespec last_seen;
145
159
146
160
/* Used for passing in values through the Avahi callback functions */
147
161
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
162
AvahiServer *server;
150
163
gnutls_certificate_credentials_t cred;
151
164
unsigned int dh_bits;
153
166
const char *priority;
154
167
gpgme_ctx_t ctx;
155
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
156
171
} mandos_context;
157
172
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
163
175
164
176
sig_atomic_t quit_now = 0;
165
177
int signal_received = 0;
166
178
167
179
/* Function to use when printing errors */
168
180
void perror_plus(const char *print_text){
181
int e = errno;
169
182
fprintf(stderr, "Mandos plugin %s: ",
170
183
program_invocation_short_name);
184
errno = e;
171
185
perror(print_text);
172
186
}
173
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
174
198
/*
175
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
200
* bytes. "buffer_capacity" is how much is currently allocated,
177
201
* "buffer_length" is how much is already used.
178
202
*/
203
__attribute__((nonnull, warn_unused_result))
179
204
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
205
size_t buffer_capacity){
181
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
184
213
return 0;
185
214
}
215
*buffer = new_buf;
186
216
buffer_capacity += BUFFER_SIZE;
187
217
}
188
218
return buffer_capacity;
189
219
}
190
220
191
221
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
195
225
int ret;
196
226
server *new_server = malloc(sizeof(server));
197
227
if(new_server == NULL){
198
228
perror_plus("malloc");
199
return -1;
229
return false;
200
230
}
201
231
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
205
235
if(new_server->ip == NULL){
206
236
perror_plus("strdup");
207
return -1;
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
208
253
}
209
254
/* Special case of first server */
210
if (mc.current_server == NULL){
255
if(*current_server == NULL){
211
256
new_server->next = new_server;
212
257
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
258
*current_server = new_server;
215
259
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
218
263
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
227
267
}
228
268
229
269
/*
230
270
* Initialize GPGME.
231
271
*/
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
234
277
gpgme_error_t rc;
235
278
gpgme_engine_info_t engine_info;
236
279
237
238
280
/*
239
281
* Helper function to insert pub and seckey to the engine keyring.
240
282
*/
241
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
242
284
int ret;
243
285
int fd;
244
286
gpgme_data_t pgp_data;
251
293
252
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
295
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
256
298
return false;
257
299
}
258
300
259
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
260
302
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
263
305
return false;
264
306
}
265
307
272
314
}
273
315
274
316
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
276
318
}
277
319
278
320
/* Init GPGME */
279
321
gpgme_check_version(NULL);
280
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
323
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
284
326
return false;
285
327
}
286
328
287
329
/* Set GPGME home directory for the OpenPGP engine only */
288
330
rc = gpgme_get_engine_info(&engine_info);
289
331
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
292
334
return false;
293
335
}
294
336
while(engine_info != NULL){
300
342
engine_info = engine_info->next;
301
343
}
302
344
if(engine_info == NULL){
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
304
347
return false;
305
348
}
306
349
307
350
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
309
352
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
312
356
return false;
313
357
}
314
358
323
367
* Decrypt OpenPGP data.
324
368
* Returns -1 on error
325
369
*/
370
__attribute__((nonnull, warn_unused_result))
326
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
372
size_t crypto_size,
328
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
329
375
gpgme_data_t dh_crypto, dh_plain;
330
376
gpgme_error_t rc;
331
377
ssize_t ret;
333
379
ssize_t plaintext_length = 0;
334
380
335
381
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
383
}
338
384
339
385
/* Create new GPGME data buffer from memory cryptotext */
340
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
387
0);
342
388
if(rc != GPG_ERR_NO_ERROR){
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
345
391
return -1;
346
392
}
347
393
348
394
/* Create new empty GPGME data buffer for the plaintext */
349
395
rc = gpgme_data_new(&dh_plain);
350
396
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
353
400
gpgme_data_release(dh_crypto);
354
401
return -1;
355
402
}
356
403
357
404
/* Decrypt data from the cryptotext data buffer to the plaintext
358
405
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
407
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
363
410
plaintext_length = -1;
364
411
if(debug){
365
412
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
367
414
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
416
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
374
421
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
423
}
377
424
gpgme_recipient_t recipient;
378
425
recipient = result->recipients;
379
426
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
386
434
recipient = recipient->next;
387
435
}
388
436
}
391
439
}
392
440
393
441
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
395
443
}
396
444
397
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
404
452
*plaintext = NULL;
405
453
while(true){
406
454
plaintext_capacity = incbuffer(plaintext,
407
(size_t)plaintext_length,
408
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
409
457
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
413
461
}
414
462
415
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
428
476
}
429
477
430
478
if(debug){
431
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
432
480
for(ssize_t i = 0; i < plaintext_length; i++){
433
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
434
482
}
445
493
return plaintext_length;
446
494
}
447
495
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
451
499
if(ret == NULL)
452
500
ret = "(unknown)";
453
501
return ret;
454
502
}
455
503
456
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
457
506
static void debuggnutls(__attribute__((unused)) int level,
458
507
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
460
509
}
461
510
511
__attribute__((nonnull, warn_unused_result))
462
512
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
464
515
int ret;
465
516
466
517
if(debug){
467
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
468
519
}
469
520
470
521
ret = gnutls_global_init();
471
522
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
474
525
return -1;
475
526
}
476
527
483
534
}
484
535
485
536
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
538
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
490
541
gnutls_global_deinit();
491
542
return -1;
492
543
}
493
544
494
545
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
498
550
}
499
551
500
552
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
502
554
GNUTLS_OPENPGP_FMT_BASE64);
503
555
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
509
561
goto globalfail;
510
562
}
511
563
512
564
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
514
566
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
517
570
goto globalfail;
518
571
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
520
573
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
523
576
goto globalfail;
524
577
}
525
578
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
527
580
528
581
return 0;
529
582
530
583
globalfail:
531
584
532
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
533
586
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
535
588
return -1;
536
589
}
537
590
538
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
539
594
int ret;
540
595
/* GnuTLS session creation */
541
596
do {
545
600
}
546
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
602
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
550
606
}
551
607
552
608
{
553
609
const char *err;
554
610
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
556
612
if(quit_now){
557
613
gnutls_deinit(*session);
558
614
return -1;
559
615
}
560
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
617
if(ret != GNUTLS_E_SUCCESS){
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
565
621
gnutls_deinit(*session);
566
622
return -1;
567
623
}
569
625
570
626
do {
571
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
628
mc->cred);
573
629
if(quit_now){
574
630
gnutls_deinit(*session);
575
631
return -1;
576
632
}
577
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
634
if(ret != GNUTLS_E_SUCCESS){
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
581
637
gnutls_deinit(*session);
582
638
return -1;
583
639
}
585
641
/* ignore client certificate if any. */
586
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
587
643
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
589
645
590
646
return 0;
591
647
}
595
651
__attribute__((unused)) const char *txt){}
596
652
597
653
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
599
656
AvahiIfIndex if_index,
600
int af){
657
int af, mandos_context *mc){
601
658
int ret, tcp_sd = -1;
602
659
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
660
struct sockaddr_storage to;
607
661
char *buffer = NULL;
608
662
char *decrypted_buffer = NULL;
609
663
size_t buffer_length = 0;
628
682
pf = PF_INET;
629
683
break;
630
684
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
632
686
errno = EINVAL;
633
687
return -1;
634
688
}
635
689
636
ret = init_gnutls_session(&session);
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
637
723
if(ret != 0){
638
724
return -1;
639
725
}
640
726
641
727
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
644
730
}
645
731
646
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
658
744
659
745
memset(&to, 0, sizeof(to));
660
746
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
663
749
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
666
752
}
667
753
if(ret < 0 ){
668
754
int e = errno;
672
758
}
673
759
if(ret == 0){
674
760
int e = errno;
675
fprintf(stderr, "Bad address: %s\n", ip);
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
676
762
errno = e;
677
763
goto mandos_end;
678
764
}
679
765
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
687
769
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
690
772
errno = EINVAL;
691
773
goto mandos_end;
692
774
}
693
775
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
695
777
}
696
778
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
700
780
}
701
781
702
782
if(quit_now){
710
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
791
perror_plus("if_indextoname");
712
792
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
715
795
}
716
796
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
719
799
}
720
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
802
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
726
807
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
729
812
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
736
819
}
737
820
}
738
821
742
825
}
743
826
744
827
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
746
830
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
748
833
}
749
834
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
836
int e = errno;
752
837
perror_plus("connect");
753
838
errno = e;
765
850
while(true){
766
851
size_t out_size = strlen(out);
767
852
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
out_size - written));
853
out_size - written));
769
854
if(ret == -1){
770
855
int e = errno;
771
856
perror_plus("write");
791
876
}
792
877
793
878
if(debug){
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
795
880
}
796
881
797
882
if(quit_now){
799
884
goto mandos_end;
800
885
}
801
886
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
804
892
805
893
if(quit_now){
806
894
errno = EINTR;
817
905
818
906
if(ret != GNUTLS_E_SUCCESS){
819
907
if(debug){
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
821
909
gnutls_perror(ret);
822
910
}
823
911
errno = EPROTO;
827
915
/* Read OpenPGP packet that contains the wanted password */
828
916
829
917
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
832
920
}
833
921
834
922
while(true){
839
927
}
840
928
841
929
buffer_capacity = incbuffer(&buffer, buffer_length,
842
buffer_capacity);
930
buffer_capacity);
843
931
if(buffer_capacity == 0){
844
932
int e = errno;
845
933
perror_plus("incbuffer");
872
960
}
873
961
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
962
if(ret < 0){
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
876
965
gnutls_perror(ret);
877
966
errno = EPROTO;
878
967
goto mandos_end;
879
968
}
880
969
break;
881
970
default:
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
884
973
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
974
errno = EIO;
886
975
goto mandos_end;
891
980
}
892
981
893
982
if(debug){
894
fprintf(stderr, "Closing TLS session\n");
983
fprintf_plus(stderr, "Closing TLS session\n");
895
984
}
896
985
897
986
if(quit_now){
909
998
910
999
if(buffer_length > 0){
911
1000
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
915
1003
if(decrypted_buffer_size >= 0){
916
1004
917
1005
written = 0;
927
1015
if(ret == 0 and ferror(stdout)){
928
1016
int e = errno;
929
1017
if(debug){
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
932
1020
}
933
1021
errno = e;
934
1022
goto mandos_end;
965
1053
return retval;
966
1054
}
967
1055
1056
__attribute__((nonnull))
968
1057
static void resolve_callback(AvahiSServiceResolver *r,
969
1058
AvahiIfIndex interface,
970
1059
AvahiProtocol proto,
978
1067
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
1068
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
1069
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
983
1074
984
1075
/* Called whenever a service has been resolved successfully or
985
1076
timed out */
986
1077
987
1078
if(quit_now){
1079
avahi_s_service_resolver_free(r);
988
1080
return;
989
1081
}
990
1082
991
1083
switch(event){
992
1084
default:
993
1085
case AVAHI_RESOLVER_FAILURE:
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1086
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
997
1091
break;
998
1092
999
1093
case AVAHI_RESOLVER_FOUND:
1001
1095
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1096
avahi_address_snprint(ip, sizeof(ip), address);
1003
1097
if(debug){
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1098
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1099
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
host_name, ip, (intmax_t)interface, port);
1007
1101
}
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
1010
1106
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1107
avahi_simple_poll_quit(simple_poll);
1012
1108
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1112
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
" list\n", name);
1114
}
1015
1115
}
1016
1116
}
1017
1117
}
1027
1127
const char *domain,
1028
1128
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1129
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
1032
1134
1033
1135
/* Called whenever a new services becomes available on the LAN or
1034
1136
is removed from the LAN */
1041
1143
default:
1042
1144
case AVAHI_BROWSER_FAILURE:
1043
1145
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1146
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
1047
1150
return;
1048
1151
1049
1152
case AVAHI_BROWSER_NEW:
1052
1155
the callback function is called the Avahi server will free the
1053
1156
resolver for us. */
1054
1157
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1162
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
1060
1166
break;
1061
1167
1062
1168
case AVAHI_BROWSER_REMOVE:
1065
1171
case AVAHI_BROWSER_ALL_FOR_NOW:
1066
1172
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1067
1173
if(debug){
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1174
fprintf_plus(stderr, "No Mandos server found, still"
1175
" searching...\n");
1069
1176
}
1070
1177
break;
1071
1178
}
1080
1187
signal_received = sig;
1081
1188
int old_errno = errno;
1082
1189
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1085
1192
}
1086
1193
errno = old_errno;
1087
1194
}
1088
1195
1196
__attribute__((nonnull, warn_unused_result))
1089
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
1198
int ret;
1199
error_t ret_errno;
1091
1200
1092
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
1202
if(s < 0){
1203
ret_errno = errno;
1094
1204
perror_plus("socket");
1205
errno = ret_errno;
1095
1206
return false;
1096
1207
}
1097
1208
strcpy(ifr->ifr_name, ifname);
1098
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
1210
if(ret == -1){
1100
1211
if(debug){
1212
ret_errno = errno;
1101
1213
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1102
1215
}
1103
1216
return false;
1104
1217
}
1105
1218
return true;
1106
1219
}
1107
1220
1221
__attribute__((nonnull, warn_unused_result))
1108
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1223
1110
1224
/* Reject the loopback device */
1111
1225
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
1226
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1228
ifname);
1115
1229
}
1116
1230
return false;
1117
1231
}
1118
1232
/* Accept point-to-point devices only if connect_to is specified */
1119
1233
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
1234
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1123
1237
}
1124
1238
return true;
1125
1239
}
1126
1240
/* Otherwise, reject non-broadcast-capable devices */
1127
1241
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
1242
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1131
1245
}
1132
1246
return false;
1133
1247
}
1134
1248
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1249
if(ifr->ifr_flags & IFF_NOARP){
1136
1250
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1252
ifname);
1138
1253
}
1139
1254
return false;
1140
1255
}
1141
1256
1142
1257
/* Accept this device */
1143
1258
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1145
1260
}
1146
1261
return true;
1147
1262
}
1151
1266
* corresponds to an acceptable network device.
1152
1267
* (This function is passed to scandir(3) as a filter function.)
1153
1268
*/
1269
__attribute__((nonnull, warn_unused_result))
1154
1270
int good_interface(const struct dirent *if_entry){
1155
1271
if(if_entry->d_name[0] == '.'){
1156
1272
return 0;
1159
1275
struct ifreq ifr;
1160
1276
if(not get_flags(if_entry->d_name, &ifr)){
1161
1277
if(debug){
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
if(not good_flags(if_entry->d_name, &ifr)){
1285
return 0;
1286
}
1287
return 1;
1288
}
1289
1290
/*
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1217
1325
int notdotentries(const struct dirent *direntry){
1218
1326
/* Skip "." and ".." */
1219
1327
if(direntry->d_name[0] == '.'
1226
1334
}
1227
1335
1228
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1229
1338
int runnable_hook(const struct dirent *direntry){
1230
1339
int ret;
1340
size_t sret;
1231
1341
struct stat st;
1232
1342
1233
1343
if((direntry->d_name)[0] == '\0'){
1235
1345
return 0;
1236
1346
}
1237
1347
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
"abcdefghijklmnopqrstuvwxyz"
1350
"0123456789"
1351
"_.-");
1352
if((direntry->d_name)[sret] != '\0'){
1353
/* Contains non-allowed characters */
1354
if(debug){
1355
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1356
direntry->d_name);
1357
}
1358
return 0;
1359
}
1360
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1255
1362
if(ret == -1){
1256
1363
if(debug){
1257
perror_plus("Could not stat plugin");
1364
perror_plus("Could not stat hook");
1258
1365
}
1259
1366
return 0;
1260
1367
}
1261
1368
if(not (S_ISREG(st.st_mode))){
1262
1369
/* Not a regular file */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1372
direntry->d_name);
1373
}
1263
1374
return 0;
1264
1375
}
1265
1376
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
1377
/* Not executable */
1378
if(debug){
1379
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1380
direntry->d_name);
1381
}
1267
1382
return 0;
1268
1383
}
1384
if(debug){
1385
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1386
direntry->d_name);
1387
}
1269
1388
return 1;
1270
1389
}
1271
1390
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1273
1394
int ret;
1274
1395
struct timespec now;
1275
1396
struct timespec waited_time;
1276
1397
intmax_t block_time;
1277
1398
1278
1399
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1400
if(mc->current_server == NULL){
1401
if(debug){
1402
fprintf_plus(stderr, "Wait until first server is found."
1403
" No timeout!\n");
1283
1404
}
1284
1405
ret = avahi_simple_poll_iterate(s, -1);
1285
1406
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1407
if(debug){
1408
fprintf_plus(stderr, "Check current_server if we should run"
1409
" it, or wait\n");
1289
1410
}
1290
1411
/* the current time */
1291
1412
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1296
1417
/* Calculating in ms how long time between now and server
1297
1418
who we visted longest time ago. Now - last seen. */
1298
1419
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1420
- mc->current_server->last_seen.tv_sec);
1300
1421
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1422
- mc->current_server->last_seen.tv_nsec);
1302
1423
/* total time is 10s/10,000ms.
1303
1424
Converting to s from ms by dividing by 1,000,
1304
1425
and ns to ms by dividing by 1,000,000. */
1306
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1307
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1429
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1430
if(debug){
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
block_time);
1311
1433
}
1312
1434
1313
1435
if(block_time <= 0){
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1318
1440
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1441
avahi_simple_poll_quit(s);
1320
1442
return 0;
1321
1443
}
1322
1444
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1445
&mc->current_server->last_seen);
1324
1446
if(ret == -1){
1325
1447
perror_plus("clock_gettime");
1326
1448
return -1;
1327
1449
}
1328
mc.current_server = mc.current_server->next;
1450
mc->current_server = mc->current_server->next;
1329
1451
block_time = 0; /* Call avahi to find new Mandos
1330
1452
servers, but don't block */
1331
1453
}
1333
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
1456
}
1335
1457
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1458
if(ret > 0 or errno != EINTR){
1337
1459
return (ret != 1) ? ret : 0;
1338
1460
}
1339
1461
}
1340
1462
}
1341
1463
}
1342
1464
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1519
const float delay){
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1547
if(numhooks == -1){
1548
perror_plus("scandir");
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1621
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1626
free(delaystring);
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
int status;
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
perror_plus("waitpid");
1656
free(direntry);
1657
continue;
1658
}
1659
if(WIFEXITED(status)){
1660
if(WEXITSTATUS(status) != 0){
1661
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1662
" with status %d\n", direntry->d_name,
1663
WEXITSTATUS(status));
1664
free(direntry);
1665
continue;
1666
}
1667
} else if(WIFSIGNALED(status)){
1668
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1669
" signal %d\n", direntry->d_name,
1670
WTERMSIG(status));
1671
free(direntry);
1672
continue;
1673
} else {
1674
fprintf_plus(stderr, "Warning: network hook \"%s\""
1675
" crashed\n", direntry->d_name);
1676
free(direntry);
1677
continue;
1678
}
1679
}
1680
if(debug){
1681
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1682
direntry->d_name);
1683
}
1684
free(direntry);
1685
}
1686
free(direntries);
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1688
perror_plus("close");
1689
} else {
1690
hookdir_fd = -1;
1691
}
1692
close(devnull);
1693
}
1694
1695
__attribute__((nonnull, warn_unused_result))
1696
error_t bring_up_interface(const char *const interface,
1697
const float delay){
1698
error_t old_errno = errno;
1699
int ret;
1700
struct ifreq network;
1701
unsigned int if_index = if_nametoindex(interface);
1702
if(if_index == 0){
1703
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1704
errno = old_errno;
1705
return ENXIO;
1706
}
1707
1708
if(quit_now){
1709
errno = old_errno;
1710
return EINTR;
1711
}
1712
1713
if(not interface_is_up(interface)){
1714
error_t ret_errno = 0, ioctl_errno = 0;
1715
if(not get_flags(interface, &network)){
1716
ret_errno = errno;
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", interface);
1719
errno = old_errno;
1720
return ret_errno;
1721
}
1722
network.ifr_flags |= IFF_UP; /* set flag */
1723
1724
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1725
if(sd == -1){
1726
ret_errno = errno;
1727
perror_plus("socket");
1728
errno = old_errno;
1729
return ret_errno;
1730
}
1731
1732
if(quit_now){
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
if(ret == -1){
1735
perror_plus("close");
1736
}
1737
errno = old_errno;
1738
return EINTR;
1739
}
1740
1741
if(debug){
1742
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1743
interface);
1744
}
1745
1746
/* Raise privileges */
1747
ret_errno = raise_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to raise privileges");
1751
}
1752
1753
#ifdef __linux__
1754
int ret_linux;
1755
bool restore_loglevel = false;
1756
if(ret_errno == 0){
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret_linux = klogctl(8, NULL, 5);
1760
if(ret_linux == -1){
1761
perror_plus("klogctl");
1762
} else {
1763
restore_loglevel = true;
1764
}
1765
}
1766
#endif /* __linux__ */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ioctl_errno = errno;
1769
#ifdef __linux__
1770
if(restore_loglevel){
1771
ret_linux = klogctl(7, NULL, 0);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
}
1775
}
1776
#endif /* __linux__ */
1777
1778
/* If raise_privileges() succeeded above */
1779
if(ret_errno == 0){
1780
/* Lower privileges */
1781
ret_errno = lower_privileges();
1782
if(ret_errno != 0){
1783
errno = ret_errno;
1784
perror_plus("Failed to lower privileges");
1785
}
1786
}
1787
1788
/* Close the socket */
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1790
if(ret == -1){
1791
perror_plus("close");
1792
}
1793
1794
if(ret_setflags == -1){
1795
errno = ioctl_errno;
1796
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1797
errno = old_errno;
1798
return ioctl_errno;
1799
}
1800
} else if(debug){
1801
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1802
interface);
1803
}
1804
1805
/* Sleep checking until interface is running.
1806
Check every 0.25s, up to total time of delay */
1807
for(int i=0; i < delay * 4; i++){
1808
if(interface_is_running(interface)){
1809
break;
1810
}
1811
struct timespec sleeptime = { .tv_nsec = 250000000 };
1812
ret = nanosleep(&sleeptime, NULL);
1813
if(ret == -1 and errno != EINTR){
1814
perror_plus("nanosleep");
1815
}
1816
}
1817
1818
errno = old_errno;
1819
return 0;
1820
}
1821
1822
__attribute__((nonnull, warn_unused_result))
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
1825
struct ifreq network;
1826
unsigned int if_index = if_nametoindex(interface);
1827
if(if_index == 0){
1828
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1829
errno = old_errno;
1830
return ENXIO;
1831
}
1832
if(interface_is_up(interface)){
1833
error_t ret_errno = 0, ioctl_errno = 0;
1834
if(not get_flags(interface, &network) and debug){
1835
ret_errno = errno;
1836
fprintf_plus(stderr, "Failed to get flags for interface "
1837
"\"%s\"\n", interface);
1838
errno = old_errno;
1839
return ret_errno;
1840
}
1841
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1842
1843
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1844
if(sd == -1){
1845
ret_errno = errno;
1846
perror_plus("socket");
1847
errno = old_errno;
1848
return ret_errno;
1849
}
1850
1851
if(debug){
1852
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1853
interface);
1854
}
1855
1856
/* Raise privileges */
1857
ret_errno = raise_privileges();
1858
if(ret_errno != 0){
1859
errno = ret_errno;
1860
perror_plus("Failed to raise privileges");
1861
}
1862
1863
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1864
ioctl_errno = errno;
1865
1866
/* If raise_privileges() succeeded above */
1867
if(ret_errno == 0){
1868
/* Lower privileges */
1869
ret_errno = lower_privileges();
1870
if(ret_errno != 0){
1871
errno = ret_errno;
1872
perror_plus("Failed to lower privileges");
1873
}
1874
}
1875
1876
/* Close the socket */
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1878
if(ret == -1){
1879
perror_plus("close");
1880
}
1881
1882
if(ret_setflags == -1){
1883
errno = ioctl_errno;
1884
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1885
errno = old_errno;
1886
return ioctl_errno;
1887
}
1888
} else if(debug){
1889
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1890
interface);
1891
}
1892
1893
errno = old_errno;
1894
return 0;
1895
}
1896
1343
1897
int main(int argc, char *argv[]){
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
1344
1902
AvahiSServiceBrowser *sb = NULL;
1345
int error;
1903
error_t ret_errno;
1346
1904
int ret;
1347
1905
intmax_t tmpmax;
1348
1906
char *tmp;
1349
1907
int exitcode = EXIT_SUCCESS;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
1908
char *interfaces_to_take_down = NULL;
1909
size_t interfaces_to_take_down_size = 0;
1910
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1911
char old_tempdir[] = "/tmp/mandosXXXXXX";
1912
char *tempdir = NULL;
1358
1913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1359
1914
const char *seckey = PATHDIR "/" SECKEY;
1360
1915
const char *pubkey = PATHDIR "/" PUBKEY;
1916
char *interfaces_hooks = NULL;
1361
1917
1362
1918
bool gnutls_initialized = false;
1363
1919
bool gpgme_initialized = false;
1425
1981
.group = 2 },
1426
1982
{ .name = "retry", .key = 132,
1427
1983
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
1984
.doc = "Retry interval used when denied by the Mandos server",
1985
.group = 2 },
1986
{ .name = "network-hook-dir", .key = 133,
1987
.arg = "DIR",
1988
.doc = "Directory where network hooks are located",
1429
1989
.group = 2 },
1430
1990
/*
1431
1991
* These reproduce what we would get without ARGP_NO_HELP
1450
2010
connect_to = arg;
1451
2011
break;
1452
2012
case 'i': /* --interface */
1453
interface = arg;
2013
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2014
arg, (int)',');
2015
if(ret_errno != 0){
2016
argp_error(state, "%s", strerror(ret_errno));
2017
}
1454
2018
break;
1455
2019
case 's': /* --seckey */
1456
2020
seckey = arg;
1485
2049
argp_error(state, "Bad retry interval");
1486
2050
}
1487
2051
break;
2052
case 133: /* --network-hook-dir */
2053
hookdir = arg;
2054
break;
1488
2055
/*
1489
2056
* These reproduce what we would get without ARGP_NO_HELP
1490
2057
*/
1496
2063
argp_state_help(state, state->out_stream,
1497
2064
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
2065
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
2066
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1500
2067
exit(argp_err_exit_status);
1501
2068
break;
1502
2069
default:
1529
2096
{
1530
2097
/* Work around Debian bug #633582:
1531
2098
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
ret = setenv("DEVICE", interface, 1);
1612
if(ret == -1){
1613
perror_plus("setenv");
1614
exit(1);
1615
}
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1617
if(ret == -1){
1618
perror_plus("setenv");
1619
exit(1);
1620
}
1621
ret = setenv("MODE", "start", 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
exit(1);
1625
}
1626
char *delaystring;
1627
ret = asprintf(&delaystring, "%f", delay);
1628
if(ret == -1){
1629
perror_plus("asprintf");
1630
exit(1);
1631
}
1632
ret = setenv("DELAY", delaystring, 1);
1633
if(ret == -1){
1634
free(delaystring);
1635
perror_plus("setenv");
1636
exit(1);
1637
}
1638
free(delaystring);
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
1641
}
1642
free(fullname);
1643
if(quit_now){
2099
2100
/* Re-raise privileges */
2101
ret_errno = raise_privileges();
2102
if(ret_errno != 0){
2103
errno = ret_errno;
2104
perror_plus("Failed to raise privileges");
2105
} else {
2106
struct stat st;
2107
2108
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2109
int seckey_fd = open(seckey, O_RDONLY);
2110
if(seckey_fd == -1){
2111
perror_plus("open");
2112
} else {
2113
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2114
if(ret == -1){
2115
perror_plus("fstat");
2116
} else {
2117
if(S_ISREG(st.st_mode)
2118
and st.st_uid == 0 and st.st_gid == 0){
2119
ret = fchown(seckey_fd, uid, gid);
2120
if(ret == -1){
2121
perror_plus("fchown");
2122
}
2123
}
2124
}
2125
TEMP_FAILURE_RETRY(close(seckey_fd));
2126
}
2127
}
2128
2129
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2130
int pubkey_fd = open(pubkey, O_RDONLY);
2131
if(pubkey_fd == -1){
2132
perror_plus("open");
2133
} else {
2134
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2135
if(ret == -1){
2136
perror_plus("fstat");
2137
} else {
2138
if(S_ISREG(st.st_mode)
2139
and st.st_uid == 0 and st.st_gid == 0){
2140
ret = fchown(pubkey_fd, uid, gid);
2141
if(ret == -1){
2142
perror_plus("fchown");
2143
}
2144
}
2145
}
2146
TEMP_FAILURE_RETRY(close(pubkey_fd));
2147
}
2148
}
2149
2150
/* Lower privileges */
2151
ret_errno = lower_privileges();
2152
if(ret_errno != 0){
2153
errno = ret_errno;
2154
perror_plus("Failed to lower privileges");
2155
}
2156
}
2157
}
2158
2159
/* Remove invalid interface names (except "none") */
2160
{
2161
char *interface = NULL;
2162
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
interface))){
2164
if(strcmp(interface, "none") != 0
2165
and if_nametoindex(interface) == 0){
2166
if(interface[0] != '\0'){
2167
fprintf_plus(stderr, "Not using nonexisting interface"
2168
" \"%s\"\n", interface);
2169
}
2170
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2171
interface = NULL;
2172
}
2173
}
2174
}
2175
2176
/* Run network hooks */
2177
{
2178
if(mc.interfaces != NULL){
2179
interfaces_hooks = malloc(mc.interfaces_size);
2180
if(interfaces_hooks == NULL){
2181
perror_plus("malloc");
1644
2182
goto end;
1645
2183
}
2184
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2185
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1646
2186
}
1647
close(devnull);
2187
run_network_hooks("start", interfaces_hooks != NULL ?
2188
interfaces_hooks : "", delay);
1648
2189
}
1649
2190
1650
2191
if(not debug){
1651
2192
avahi_set_log_function(empty_log);
1652
2193
}
1653
2194
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1658
alphasort);
1659
if(ret == 0){
1660
/* No up interfaces, look for any good interfaces */
1661
free(direntries);
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1663
alphasort);
1664
}
1665
if(ret >= 1){
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1668
if(debug){
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1670
}
1671
if(interface == NULL){
1672
perror_plus("malloc");
1673
free(direntries);
1674
exitcode = EXIT_FAILURE;
1675
goto end;
1676
}
1677
free(direntries);
1678
} else {
1679
free(direntries);
1680
fprintf(stderr, "Could not find a network interface\n");
1681
exitcode = EXIT_FAILURE;
1682
goto end;
1683
}
1684
}
1685
1686
2195
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1687
2196
from the signal handler */
1688
2197
/* Initialize the pseudo-RNG for Avahi */
1689
2198
srand((unsigned int) time(NULL));
1690
mc.simple_poll = avahi_simple_poll_new();
1691
if(mc.simple_poll == NULL){
1692
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2199
simple_poll = avahi_simple_poll_new();
2200
if(simple_poll == NULL){
2201
fprintf_plus(stderr,
2202
"Avahi: Failed to create simple poll object.\n");
1693
2203
exitcode = EX_UNAVAILABLE;
1694
2204
goto end;
1695
2205
}
1757
2267
}
1758
2268
}
1759
2269
1760
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
1762
if_index = (AvahiIfIndex) if_nametoindex(interface);
1763
if(if_index == 0){
1764
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1765
exitcode = EX_UNAVAILABLE;
1766
goto end;
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
/* Re-raise priviliges */
1774
errno = 0;
1775
ret = seteuid(0);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
1780
#ifdef __linux__
1781
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1783
ret = klogctl(8, NULL, 5);
1784
bool restore_loglevel = true;
1785
if(ret == -1){
1786
restore_loglevel = false;
1787
perror_plus("klogctl");
1788
}
1789
#endif /* __linux__ */
1790
1791
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1792
if(sd < 0){
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1795
#ifdef __linux__
1796
if(restore_loglevel){
1797
ret = klogctl(7, NULL, 0);
1798
if(ret == -1){
1799
perror_plus("klogctl");
1800
}
1801
}
1802
#endif /* __linux__ */
1803
/* Lower privileges */
1804
errno = 0;
1805
ret = seteuid(uid);
1806
if(ret == -1){
1807
perror_plus("seteuid");
1808
}
1809
goto end;
1810
}
1811
strcpy(network.ifr_name, interface);
1812
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1813
if(ret == -1){
1814
perror_plus("ioctl SIOCGIFFLAGS");
1815
#ifdef __linux__
1816
if(restore_loglevel){
1817
ret = klogctl(7, NULL, 0);
1818
if(ret == -1){
1819
perror_plus("klogctl");
1820
}
1821
}
1822
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
if((network.ifr_flags & IFF_UP) == 0){
1833
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1836
if(ret == -1){
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1840
#ifdef __linux__
1841
if(restore_loglevel){
1842
ret = klogctl(7, NULL, 0);
1843
if(ret == -1){
1844
perror_plus("klogctl");
2270
/* If no interfaces were specified, make a list */
2271
if(mc.interfaces == NULL){
2272
struct dirent **direntries = NULL;
2273
/* Look for any good interfaces */
2274
ret = scandir(sys_class_net, &direntries, good_interface,
2275
alphasort);
2276
if(ret >= 1){
2277
/* Add all found interfaces to interfaces list */
2278
for(int i = 0; i < ret; ++i){
2279
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2280
direntries[i]->d_name);
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("argz_add");
2284
free(direntries[i]);
2285
continue;
2286
}
2287
if(debug){
2288
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2289
direntries[i]->d_name);
2290
}
2291
free(direntries[i]);
2292
}
2293
free(direntries);
2294
} else {
2295
if(ret == 0){
2296
free(direntries);
2297
}
2298
fprintf_plus(stderr, "Could not find a network interface\n");
2299
exitcode = EXIT_FAILURE;
2300
goto end;
2301
}
2302
}
2303
2304
/* Bring up interfaces which are down, and remove any "none"s */
2305
{
2306
char *interface = NULL;
2307
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2308
interface))){
2309
/* If interface name is "none", stop bringing up interfaces.
2310
Also remove all instances of "none" from the list */
2311
if(strcmp(interface, "none") == 0){
2312
argz_delete(&mc.interfaces, &mc.interfaces_size,
2313
interface);
2314
interface = NULL;
2315
while((interface = argz_next(mc.interfaces,
2316
mc.interfaces_size, interface))){
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
1845
2321
}
1846
2322
}
1847
#endif /* __linux__ */
1848
/* Lower privileges */
1849
errno = 0;
1850
ret = seteuid(uid);
1851
if(ret == -1){
1852
perror_plus("seteuid");
1853
}
1854
goto end;
1855
}
1856
}
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1859
for(int i=0; i < delay * 4; i++){
1860
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1861
if(ret == -1){
1862
perror_plus("ioctl SIOCGIFFLAGS");
1863
} else if(network.ifr_flags & IFF_RUNNING){
1864
2323
break;
1865
2324
}
1866
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
ret = nanosleep(&sleeptime, NULL);
1868
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1870
}
1871
}
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1875
if(ret == -1){
1876
perror_plus("close");
1877
}
1878
}
1879
#ifdef __linux__
1880
if(restore_loglevel){
1881
/* Restores kernel loglevel to default */
1882
ret = klogctl(7, NULL, 0);
1883
if(ret == -1){
1884
perror_plus("klogctl");
1885
}
1886
}
1887
#endif /* __linux__ */
1888
/* Lower privileges */
1889
errno = 0;
1890
if(take_down_interface){
1891
/* Lower privileges */
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
} else {
1897
/* Lower privileges permanently */
1898
ret = setuid(uid);
1899
if(ret == -1){
1900
perror_plus("setuid");
1901
}
1902
}
2325
bool interface_was_up = interface_is_up(interface);
2326
errno = bring_up_interface(interface, delay);
2327
if(not interface_was_up){
2328
if(errno != 0){
2329
perror_plus("Failed to bring up interface");
2330
} else {
2331
errno = argz_add(&interfaces_to_take_down,
2332
&interfaces_to_take_down_size,
2333
interface);
2334
if(errno != 0){
2335
perror_plus("argz_add");
2336
}
2337
}
2338
}
2339
}
2340
if(debug and (interfaces_to_take_down == NULL)){
2341
fprintf_plus(stderr, "No interfaces were brought up\n");
2342
}
2343
}
2344
2345
/* If we only got one interface, explicitly use only that one */
2346
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2347
if(debug){
2348
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2349
mc.interfaces);
2350
}
2351
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1903
2352
}
1904
2353
1905
2354
if(quit_now){
1906
2355
goto end;
1907
2356
}
1908
2357
1909
ret = init_gnutls_global(pubkey, seckey);
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
1910
2359
if(ret == -1){
1911
fprintf(stderr, "init_gnutls_global failed\n");
2360
fprintf_plus(stderr, "init_gnutls_global failed\n");
1912
2361
exitcode = EX_UNAVAILABLE;
1913
2362
goto end;
1914
2363
} else {
1919
2368
goto end;
1920
2369
}
1921
2370
1922
if(mkdtemp(tempdir) == NULL){
2371
/* Try /run/tmp before /tmp */
2372
tempdir = mkdtemp(run_tempdir);
2373
if(tempdir == NULL and errno == ENOENT){
2374
if(debug){
2375
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2376
run_tempdir, old_tempdir);
2377
}
2378
tempdir = mkdtemp(old_tempdir);
2379
}
2380
if(tempdir == NULL){
1923
2381
perror_plus("mkdtemp");
1924
2382
goto end;
1925
2383
}
1926
tempdir_created = true;
1927
2384
1928
2385
if(quit_now){
1929
2386
goto end;
1930
2387
}
1931
2388
1932
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
fprintf(stderr, "init_gpgme failed\n");
2389
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2390
fprintf_plus(stderr, "init_gpgme failed\n");
1934
2391
exitcode = EX_UNAVAILABLE;
1935
2392
goto end;
1936
2393
} else {
1945
2402
/* Connect directly, do not use Zeroconf */
1946
2403
/* (Mainly meant for debugging) */
1947
2404
char *address = strrchr(connect_to, ':');
2405
1948
2406
if(address == NULL){
1949
fprintf(stderr, "No colon in address\n");
2407
fprintf_plus(stderr, "No colon in address\n");
1950
2408
exitcode = EX_USAGE;
1951
2409
goto end;
1952
2410
}
1955
2413
goto end;
1956
2414
}
1957
2415
1958
uint16_t port;
2416
in_port_t port;
1959
2417
errno = 0;
1960
2418
tmpmax = strtoimax(address+1, &tmp, 10);
1961
2419
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1962
or tmpmax != (uint16_t)tmpmax){
1963
fprintf(stderr, "Bad port number\n");
2420
or tmpmax != (in_port_t)tmpmax){
2421
fprintf_plus(stderr, "Bad port number\n");
1964
2422
exitcode = EX_USAGE;
1965
2423
goto end;
1966
2424
}
1967
2425
1968
2426
if(quit_now){
1969
2427
goto end;
1970
2428
}
1971
2429
1972
port = (uint16_t)tmpmax;
2430
port = (in_port_t)tmpmax;
1973
2431
*address = '\0';
1974
2432
/* Colon in address indicates IPv6 */
1975
2433
int af;
1991
2449
}
1992
2450
1993
2451
while(not quit_now){
1994
ret = start_mandos_communication(address, port, if_index, af);
2452
ret = start_mandos_communication(address, port, if_index, af,
2453
&mc);
1995
2454
if(quit_now or ret == 0){
1996
2455
break;
1997
2456
}
1998
2457
if(debug){
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2458
fprintf_plus(stderr, "Retrying in %d seconds\n",
2459
(int)retry_interval);
2001
2460
}
2002
sleep((int)retry_interval);
2461
sleep((unsigned int)retry_interval);
2003
2462
}
2004
2463
2005
if (not quit_now){
2464
if(not quit_now){
2006
2465
exitcode = EXIT_SUCCESS;
2007
2466
}
2008
2467
2023
2482
config.publish_domain = 0;
2024
2483
2025
2484
/* Allocate a new server */
2026
mc.server = avahi_server_new(avahi_simple_poll_get
2027
(mc.simple_poll), &config, NULL,
2028
NULL, &error);
2485
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2486
&config, NULL, NULL, &ret_errno);
2029
2487
2030
2488
/* Free the Avahi configuration data */
2031
2489
avahi_server_config_free(&config);
2033
2491
2034
2492
/* Check if creating the Avahi server object succeeded */
2035
2493
if(mc.server == NULL){
2036
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
avahi_strerror(error));
2494
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2495
avahi_strerror(ret_errno));
2038
2496
exitcode = EX_UNAVAILABLE;
2039
2497
goto end;
2040
2498
}
2046
2504
/* Create the Avahi service browser */
2047
2505
sb = avahi_s_service_browser_new(mc.server, if_index,
2048
2506
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2049
NULL, 0, browse_callback, NULL);
2507
NULL, 0, browse_callback,
2508
(void *)&mc);
2050
2509
if(sb == NULL){
2051
fprintf(stderr, "Failed to create service browser: %s\n",
2052
avahi_strerror(avahi_server_errno(mc.server)));
2510
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2511
avahi_strerror(avahi_server_errno(mc.server)));
2053
2512
exitcode = EX_UNAVAILABLE;
2054
2513
goto end;
2055
2514
}
2061
2520
/* Run the main loop */
2062
2521
2063
2522
if(debug){
2064
fprintf(stderr, "Starting Avahi loop search\n");
2523
fprintf_plus(stderr, "Starting Avahi loop search\n");
2065
2524
}
2066
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2525
2526
ret = avahi_loop_with_timeout(simple_poll,
2527
(int)(retry_interval * 1000), &mc);
2069
2528
if(debug){
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2529
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2530
(ret == 0) ? "successfully" : "with error");
2072
2531
}
2073
2532
2074
2533
end:
2075
2534
2076
2535
if(debug){
2077
fprintf(stderr, "%s exiting\n", argv[0]);
2536
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2078
2537
}
2079
2538
2080
2539
/* Cleanup things */
2540
free(mc.interfaces);
2541
2081
2542
if(sb != NULL)
2082
2543
avahi_s_service_browser_free(sb);
2083
2544
2084
2545
if(mc.server != NULL)
2085
2546
avahi_server_free(mc.server);
2086
2547
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
2548
if(simple_poll != NULL)
2549
avahi_simple_poll_free(simple_poll);
2089
2550
2090
2551
if(gnutls_initialized){
2091
2552
gnutls_certificate_free_credentials(mc.cred);
2096
2557
if(gpgme_initialized){
2097
2558
gpgme_release(mc.ctx);
2098
2559
}
2099
2560
2100
2561
/* Cleans up the circular linked list of Mandos servers the client
2101
2562
has seen */
2102
2563
if(mc.current_server != NULL){
2103
2564
mc.current_server->prev->next = NULL;
2104
2565
while(mc.current_server != NULL){
2105
2566
server *next = mc.current_server->next;
2567
#ifdef __GNUC__
2568
#pragma GCC diagnostic push
2569
#pragma GCC diagnostic ignored "-Wcast-qual"
2570
#endif
2571
free((char *)(mc.current_server->ip));
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic pop
2574
#endif
2106
2575
free(mc.current_server);
2107
2576
mc.current_server = next;
2108
2577
}
2109
2578
}
2110
2579
2111
/* XXX run network hooks "stop" here */
2112
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2116
errno = 0;
2117
ret = seteuid(0);
2118
if(ret == -1){
2119
perror_plus("seteuid");
2580
/* Re-raise privileges */
2581
{
2582
ret_errno = raise_privileges();
2583
if(ret_errno != 0){
2584
errno = ret_errno;
2585
perror_plus("Failed to raise privileges");
2586
} else {
2587
2588
/* Run network hooks */
2589
run_network_hooks("stop", interfaces_hooks != NULL ?
2590
interfaces_hooks : "", delay);
2591
2592
/* Take down the network interfaces which were brought up */
2593
{
2594
char *interface = NULL;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2597
interface))){
2598
ret_errno = take_down_interface(interface);
2599
if(ret_errno != 0){
2600
errno = ret_errno;
2601
perror_plus("Failed to take down interface");
2602
}
2603
}
2604
if(debug and (interfaces_to_take_down == NULL)){
2605
fprintf_plus(stderr, "No interfaces needed to be taken"
2606
" down\n");
2607
}
2608
}
2120
2609
}
2121
if(geteuid() == 0){
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2123
if(ret == -1){
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2128
if(ret == -1){
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2130
}
2131
}
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2133
if(ret == -1){
2134
perror_plus("close");
2135
}
2136
/* Lower privileges permanently */
2137
errno = 0;
2138
ret = setuid(uid);
2139
if(ret == -1){
2140
perror_plus("setuid");
2141
}
2610
2611
ret_errno = lower_privileges_permanently();
2612
if(ret_errno != 0){
2613
errno = ret_errno;
2614
perror_plus("Failed to lower privileges permanently");
2142
2615
}
2143
2616
}
2144
2617
2618
free(interfaces_to_take_down);
2619
free(interfaces_hooks);
2620
2145
2621
/* Removes the GPGME temp directory and all files inside */
2146
if(tempdir_created){
2622
if(tempdir != NULL){
2147
2623
struct dirent **direntries = NULL;
2148
struct dirent *direntry = NULL;
2149
int numentries = scandir(tempdir, &direntries, notdotentries,
2150
alphasort);
2151
if (numentries > 0){
2152
for(int i = 0; i < numentries; i++){
2153
direntry = direntries[i];
2154
char *fullname = NULL;
2155
ret = asprintf(&fullname, "%s/%s", tempdir,
2156
direntry->d_name);
2157
if(ret < 0){
2158
perror_plus("asprintf");
2159
continue;
2160
}
2161
ret = remove(fullname);
2162
if(ret == -1){
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2164
strerror(errno));
2165
}
2166
free(fullname);
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2625
O_NOFOLLOW));
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2628
} else {
2629
#ifdef __GLIBC__
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2639
alphasort);
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2644
if(ret == -1){
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2648
}
2649
free(direntries[i]);
2650
}
2651
2652
/* need to clean even if 0 because man page doesn't specify */
2653
free(direntries);
2654
if(numentries == -1){
2655
perror_plus("scandir");
2656
}
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2660
}
2167
2661
}
2168
}
2169
2170
/* need to clean even if 0 because man page doesn't specify */
2171
free(direntries);
2172
if (numentries == -1){
2173
perror_plus("scandir");
2174
}
2175
ret = rmdir(tempdir);
2176
if(ret == -1 and errno != ENOENT){
2177
perror_plus("rmdir");
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2178
2663
}
2179
2664
}
2180
2665
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0