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- Committer: teddy at bsnet
- Date: 2011-11-11 15:05:27 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111111150527-hdlgk1hkubtbth10
* plugins.d/mandos-client.c (good_interface): Add error message.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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() */
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
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
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(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
86
85
raise() */
87
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
87
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() */
98
88
99
89
#ifdef __linux__
100
90
#include <sys/klog.h> /* klogctl() */
118
108
init_gnutls_session(),
119
109
GNUTLS_* */
120
110
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
123
113
124
114
/* GPGME */
125
115
#include <gpgme.h> /* All GPGME types, constants and
141
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
132
static const char sys_class_net[] = "/sys/class/net";
143
133
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
134
149
135
/* Doubly linked list that need to be circularly linked when used */
150
136
typedef struct server{
151
137
const char *ip;
152
in_port_t port;
138
uint16_t port;
153
139
AvahiIfIndex if_index;
154
140
int af;
155
141
struct timespec last_seen;
159
145
160
146
/* Used for passing in values through the Avahi callback functions */
161
147
typedef struct {
148
AvahiSimplePoll *simple_poll;
162
149
AvahiServer *server;
163
150
gnutls_certificate_credentials_t cred;
164
151
unsigned int dh_bits;
166
153
const char *priority;
167
154
gpgme_ctx_t ctx;
168
155
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
156
} mandos_context;
172
157
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
175
163
176
164
sig_atomic_t quit_now = 0;
177
165
int signal_received = 0;
178
166
179
167
/* Function to use when printing errors */
180
168
void perror_plus(const char *print_text){
181
int e = errno;
182
169
fprintf(stderr, "Mandos plugin %s: ",
183
170
program_invocation_short_name);
184
errno = e;
185
171
perror(print_text);
186
172
}
187
173
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
198
174
/*
199
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
176
* bytes. "buffer_capacity" is how much is currently allocated,
201
177
* "buffer_length" is how much is already used.
202
178
*/
203
__attribute__((nonnull, warn_unused_result))
204
179
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
180
size_t buffer_capacity){
206
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
213
184
return 0;
214
185
}
215
*buffer = new_buf;
216
186
buffer_capacity += BUFFER_SIZE;
217
187
}
218
188
return buffer_capacity;
219
189
}
220
190
221
191
/* Add server to set of servers to retry periodically */
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){
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
225
195
int ret;
226
196
server *new_server = malloc(sizeof(server));
227
197
if(new_server == NULL){
228
198
perror_plus("malloc");
229
return false;
199
return -1;
230
200
}
231
201
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
202
.port = port,
203
.if_index = if_index,
204
.af = af };
235
205
if(new_server->ip == NULL){
236
206
perror_plus("strdup");
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;
207
return -1;
253
208
}
254
209
/* Special case of first server */
255
if(*current_server == NULL){
210
if (mc.current_server == NULL){
256
211
new_server->next = new_server;
257
212
new_server->prev = new_server;
258
*current_server = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
259
215
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
263
218
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
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;
267
227
}
268
228
269
229
/*
270
230
* Initialize GPGME.
271
231
*/
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){
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
277
234
gpgme_error_t rc;
278
235
gpgme_engine_info_t engine_info;
279
236
237
280
238
/*
281
239
* Helper function to insert pub and seckey to the engine keyring.
282
240
*/
283
bool import_key(const char * const filename){
241
bool import_key(const char *filename){
284
242
int ret;
285
243
int fd;
286
244
gpgme_data_t pgp_data;
293
251
294
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
253
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
298
256
return false;
299
257
}
300
258
301
rc = gpgme_op_import(mc->ctx, pgp_data);
259
rc = gpgme_op_import(mc.ctx, pgp_data);
302
260
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
305
263
return false;
306
264
}
307
265
314
272
}
315
273
316
274
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
275
fprintf(stderr, "Initializing GPGME\n");
318
276
}
319
277
320
278
/* Init GPGME */
321
279
gpgme_check_version(NULL);
322
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
281
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
326
284
return false;
327
285
}
328
286
329
287
/* Set GPGME home directory for the OpenPGP engine only */
330
288
rc = gpgme_get_engine_info(&engine_info);
331
289
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
334
292
return false;
335
293
}
336
294
while(engine_info != NULL){
342
300
engine_info = engine_info->next;
343
301
}
344
302
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
304
return false;
348
305
}
349
306
350
307
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
308
rc = gpgme_new(&(mc.ctx));
352
309
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
356
312
return false;
357
313
}
358
314
367
323
* Decrypt OpenPGP data.
368
324
* Returns -1 on error
369
325
*/
370
__attribute__((nonnull, warn_unused_result))
371
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
327
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
328
char **plaintext){
375
329
gpgme_data_t dh_crypto, dh_plain;
376
330
gpgme_error_t rc;
377
331
ssize_t ret;
379
333
ssize_t plaintext_length = 0;
380
334
381
335
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
337
}
384
338
385
339
/* Create new GPGME data buffer from memory cryptotext */
386
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
341
0);
388
342
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
391
345
return -1;
392
346
}
393
347
394
348
/* Create new empty GPGME data buffer for the plaintext */
395
349
rc = gpgme_data_new(&dh_plain);
396
350
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
400
353
gpgme_data_release(dh_crypto);
401
354
return -1;
402
355
}
403
356
404
357
/* Decrypt data from the cryptotext data buffer to the plaintext
405
358
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
360
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
410
363
plaintext_length = -1;
411
364
if(debug){
412
365
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
366
result = gpgme_op_decrypt_result(mc.ctx);
414
367
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
369
} else {
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);
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
421
374
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
fprintf(stderr, "File name: %s\n", result->file_name);
423
376
}
424
377
gpgme_recipient_t recipient;
425
378
recipient = result->recipients;
426
379
while(recipient != NULL){
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");
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");
434
386
recipient = recipient->next;
435
387
}
436
388
}
439
391
}
440
392
441
393
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
395
}
444
396
445
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
452
404
*plaintext = NULL;
453
405
while(true){
454
406
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
407
(size_t)plaintext_length,
408
plaintext_capacity);
457
409
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
461
413
}
462
414
463
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
476
428
}
477
429
478
430
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
431
fprintf(stderr, "Decrypted password is: ");
480
432
for(ssize_t i = 0; i < plaintext_length; i++){
481
433
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
434
}
493
445
return plaintext_length;
494
446
}
495
447
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
499
451
if(ret == NULL)
500
452
ret = "(unknown)";
501
453
return ret;
502
454
}
503
455
504
456
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
457
static void debuggnutls(__attribute__((unused)) int level,
507
458
const char* string){
508
fprintf_plus(stderr, "GnuTLS: %s", string);
459
fprintf(stderr, "GnuTLS: %s", string);
509
460
}
510
461
511
__attribute__((nonnull, warn_unused_result))
512
462
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
463
const char *seckeyfilename){
515
464
int ret;
516
465
517
466
if(debug){
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
fprintf(stderr, "Initializing GnuTLS\n");
519
468
}
520
469
521
470
ret = gnutls_global_init();
522
471
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
525
474
return -1;
526
475
}
527
476
534
483
}
535
484
536
485
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
487
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
541
490
gnutls_global_deinit();
542
491
return -1;
543
492
}
544
493
545
494
if(debug){
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
550
498
}
551
499
552
500
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
554
502
GNUTLS_OPENPGP_FMT_BASE64);
555
503
if(ret != GNUTLS_E_SUCCESS){
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));
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));
561
509
goto globalfail;
562
510
}
563
511
564
512
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
513
ret = gnutls_dh_params_init(&mc.dh_params);
566
514
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
570
517
goto globalfail;
571
518
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
520
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
576
523
goto globalfail;
577
524
}
578
525
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
580
527
581
528
return 0;
582
529
583
530
globalfail:
584
531
585
gnutls_certificate_free_credentials(mc->cred);
532
gnutls_certificate_free_credentials(mc.cred);
586
533
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
534
gnutls_dh_params_deinit(mc.dh_params);
588
535
return -1;
589
536
}
590
537
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
538
static int init_gnutls_session(gnutls_session_t *session){
594
539
int ret;
595
540
/* GnuTLS session creation */
596
541
do {
600
545
}
601
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
547
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
606
550
}
607
551
608
552
{
609
553
const char *err;
610
554
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
612
556
if(quit_now){
613
557
gnutls_deinit(*session);
614
558
return -1;
615
559
}
616
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
617
561
if(ret != GNUTLS_E_SUCCESS){
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
621
565
gnutls_deinit(*session);
622
566
return -1;
623
567
}
625
569
626
570
do {
627
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
572
mc.cred);
629
573
if(quit_now){
630
574
gnutls_deinit(*session);
631
575
return -1;
632
576
}
633
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
634
578
if(ret != GNUTLS_E_SUCCESS){
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
637
581
gnutls_deinit(*session);
638
582
return -1;
639
583
}
641
585
/* ignore client certificate if any. */
642
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
587
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
645
589
646
590
return 0;
647
591
}
650
594
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
651
595
__attribute__((unused)) const char *txt){}
652
596
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and delete_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_delete_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char debug_flag[] = "--debug";
715
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
716
if(pluginhelperdir == NULL){
717
if(debug){
718
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
719
" variable not set; cannot run helper\n");
720
}
721
return false;
722
}
723
724
char interface[IF_NAMESIZE];
725
if(if_indextoname((unsigned int)if_index, interface) == NULL){
726
perror_plus("if_indextoname");
727
return false;
728
}
729
730
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
if(devnull == -1){
732
perror_plus("open(\"/dev/null\", O_RDONLY)");
733
return false;
734
}
735
pid_t pid = fork();
736
if(pid == 0){
737
/* Child */
738
/* Raise privileges */
739
errno = raise_privileges_permanently();
740
if(errno != 0){
741
perror_plus("Failed to raise privileges");
742
/* _exit(EX_NOPERM); */
743
} else {
744
/* Set group */
745
errno = 0;
746
ret = setgid(0);
747
if(ret == -1){
748
perror_plus("setgid");
749
_exit(EX_NOPERM);
750
}
751
/* Reset supplementary groups */
752
errno = 0;
753
ret = setgroups(0, NULL);
754
if(ret == -1){
755
perror_plus("setgroups");
756
_exit(EX_NOPERM);
757
}
758
}
759
ret = dup2(devnull, STDIN_FILENO);
760
if(ret == -1){
761
perror_plus("dup2(devnull, STDIN_FILENO)");
762
_exit(EX_OSERR);
763
}
764
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
765
if(ret == -1){
766
perror_plus("close");
767
_exit(EX_OSERR);
768
}
769
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
if(ret == -1){
771
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
772
_exit(EX_OSERR);
773
}
774
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
775
O_RDONLY
776
| O_DIRECTORY
777
| O_PATH
778
| O_CLOEXEC));
779
if(helperdir_fd == -1){
780
perror_plus("open");
781
_exit(EX_UNAVAILABLE);
782
}
783
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
784
helper, O_RDONLY));
785
if(helper_fd == -1){
786
perror_plus("openat");
787
_exit(EX_UNAVAILABLE);
788
}
789
TEMP_FAILURE_RETRY(close(helperdir_fd));
790
#ifdef __GNUC__
791
#pragma GCC diagnostic push
792
#pragma GCC diagnostic ignored "-Wcast-qual"
793
#endif
794
if(fexecve(helper_fd, (char *const [])
795
{ helper, add ? add_arg : delete_arg, (char *)address,
796
interface, debug ? debug_flag : NULL, NULL },
797
environ) == -1){
798
#ifdef __GNUC__
799
#pragma GCC diagnostic pop
800
#endif
801
perror_plus("fexecve");
802
_exit(EXIT_FAILURE);
803
}
804
}
805
if(pid == -1){
806
perror_plus("fork");
807
return false;
808
}
809
int status;
810
pid_t pret = -1;
811
errno = 0;
812
do {
813
pret = waitpid(pid, &status, 0);
814
if(pret == -1 and errno == EINTR and quit_now){
815
int errno_raising = 0;
816
if((errno = raise_privileges()) != 0){
817
errno_raising = errno;
818
perror_plus("Failed to raise privileges in order to"
819
" kill helper program");
820
}
821
if(kill(pid, SIGTERM) == -1){
822
perror_plus("kill");
823
}
824
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
825
perror_plus("Failed to lower privileges after killing"
826
" helper program");
827
}
828
return false;
829
}
830
} while(pret == -1 and errno == EINTR);
831
if(pret == -1){
832
perror_plus("waitpid");
833
return false;
834
}
835
if(WIFEXITED(status)){
836
if(WEXITSTATUS(status) != 0){
837
fprintf_plus(stderr, "Error: iprouteadddel exited"
838
" with status %d\n", WEXITSTATUS(status));
839
return false;
840
}
841
return true;
842
}
843
if(WIFSIGNALED(status)){
844
fprintf_plus(stderr, "Error: iprouteadddel died by"
845
" signal %d\n", WTERMSIG(status));
846
return false;
847
}
848
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
849
return false;
850
}
851
852
__attribute__((nonnull, warn_unused_result))
853
static bool add_local_route(const char *address,
854
AvahiIfIndex if_index){
855
if(debug){
856
fprintf_plus(stderr, "Adding route to %s\n", address);
857
}
858
return add_delete_local_route(true, address, if_index);
859
}
860
861
__attribute__((nonnull, warn_unused_result))
862
static bool delete_local_route(const char *address,
863
AvahiIfIndex if_index){
864
if(debug){
865
fprintf_plus(stderr, "Removing route to %s\n", address);
866
}
867
return add_delete_local_route(false, address, if_index);
868
}
869
870
597
/* Called when a Mandos server is found */
871
__attribute__((nonnull, warn_unused_result))
872
static int start_mandos_communication(const char *ip, in_port_t port,
598
static int start_mandos_communication(const char *ip, uint16_t port,
873
599
AvahiIfIndex if_index,
874
int af, mandos_context *mc){
600
int af){
875
601
int ret, tcp_sd = -1;
876
602
ssize_t sret;
877
struct sockaddr_storage to;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
878
607
char *buffer = NULL;
879
608
char *decrypted_buffer = NULL;
880
609
size_t buffer_length = 0;
883
612
int retval = -1;
884
613
gnutls_session_t session;
885
614
int pf; /* Protocol family */
886
bool route_added = false;
887
615
888
616
errno = 0;
889
617
900
628
pf = PF_INET;
901
629
break;
902
630
default:
903
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
fprintf(stderr, "Bad address family: %d\n", af);
904
632
errno = EINVAL;
905
633
return -1;
906
634
}
907
635
908
/* If the interface is specified and we have a list of interfaces */
909
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
910
/* Check if the interface is one of the interfaces we are using */
911
bool match = false;
912
{
913
char *interface = NULL;
914
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
915
interface))){
916
if(if_nametoindex(interface) == (unsigned int)if_index){
917
match = true;
918
break;
919
}
920
}
921
}
922
if(not match){
923
/* This interface does not match any in the list, so we don't
924
connect to the server */
925
if(debug){
926
char interface[IF_NAMESIZE];
927
if(if_indextoname((unsigned int)if_index, interface) == NULL){
928
perror_plus("if_indextoname");
929
} else {
930
fprintf_plus(stderr, "Skipping server on non-used interface"
931
" \"%s\"\n",
932
if_indextoname((unsigned int)if_index,
933
interface));
934
}
935
}
936
return -1;
937
}
938
}
939
940
ret = init_gnutls_session(&session, mc);
636
ret = init_gnutls_session(&session);
941
637
if(ret != 0){
942
638
return -1;
943
639
}
944
640
945
641
if(debug){
946
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
947
PRIuMAX "\n", ip, (uintmax_t)port);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
948
644
}
949
645
950
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
951
647
if(tcp_sd < 0){
952
648
int e = errno;
953
649
perror_plus("socket");
962
658
963
659
memset(&to, 0, sizeof(to));
964
660
if(af == AF_INET6){
965
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
966
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
967
663
} else { /* IPv4 */
968
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
969
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
970
666
}
971
667
if(ret < 0 ){
972
668
int e = errno;
976
672
}
977
673
if(ret == 0){
978
674
int e = errno;
979
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
fprintf(stderr, "Bad address: %s\n", ip);
980
676
errno = e;
981
677
goto mandos_end;
982
678
}
983
679
if(af == AF_INET6){
984
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
985
if(IN6_IS_ADDR_LINKLOCAL
986
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
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*/
987
687
if(if_index == AVAHI_IF_UNSPEC){
988
fprintf_plus(stderr, "An IPv6 link-local address is"
989
" incomplete without a network interface\n");
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
990
690
errno = EINVAL;
991
691
goto mandos_end;
992
692
}
993
693
/* Set the network interface number as scope */
994
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
to.in6.sin6_scope_id = (uint32_t)if_index;
995
695
}
996
696
} else {
997
((struct sockaddr_in *)&to)->sin_port = htons(port);
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
998
700
}
999
701
1000
702
if(quit_now){
1008
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1009
711
perror_plus("if_indextoname");
1010
712
} else {
1011
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1012
"\n", ip, interface, (uintmax_t)port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1013
715
}
1014
716
} else {
1015
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1016
ip, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
1017
719
}
1018
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1019
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1020
if(af == AF_INET6){
1021
ret = getnameinfo((struct sockaddr *)&to,
1022
sizeof(struct sockaddr_in6),
1023
addrstr, sizeof(addrstr), NULL, 0,
1024
NI_NUMERICHOST);
1025
} else {
1026
ret = getnameinfo((struct sockaddr *)&to,
1027
sizeof(struct sockaddr_in),
1028
addrstr, sizeof(addrstr), NULL, 0,
1029
NI_NUMERICHOST);
1030
}
1031
if(ret == EAI_SYSTEM){
1032
perror_plus("getnameinfo");
1033
} else if(ret != 0) {
1034
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1035
} else if(strcmp(addrstr, ip) != 0){
1036
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1037
}
1038
}
1039
1040
if(quit_now){
1041
errno = EINTR;
1042
goto mandos_end;
1043
}
1044
1045
while(true){
1046
if(af == AF_INET6){
1047
ret = connect(tcp_sd, (struct sockaddr *)&to,
1048
sizeof(struct sockaddr_in6));
1049
} else {
1050
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1051
sizeof(struct sockaddr_in));
1052
}
1053
if(ret < 0){
1054
if(errno == ENETUNREACH
1055
and if_index != AVAHI_IF_UNSPEC
1056
and connect_to == NULL
1057
and not route_added and
1058
((af == AF_INET6 and not
1059
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1060
&to)->sin6_addr)))
1061
or (af == AF_INET and
1062
/* Not a a IPv4LL address */
1063
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1064
& 0xFFFF0000L) != 0xA9FE0000L))){
1065
/* Work around Avahi bug - Avahi does not announce link-local
1066
addresses if it has a global address, so local hosts with
1067
*only* a link-local address (e.g. Mandos clients) cannot
1068
connect to a Mandos server announced by Avahi on a server
1069
host with a global address. Work around this by retrying
1070
with an explicit route added with the server's address.
1071
1072
Avahi bug reference:
1073
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1074
https://bugs.debian.org/587961
1075
*/
1076
if(debug){
1077
fprintf_plus(stderr, "Mandos server unreachable, trying"
1078
" direct route\n");
1079
}
1080
int e = errno;
1081
route_added = add_local_route(ip, if_index);
1082
if(route_added){
1083
continue;
1084
}
1085
errno = e;
1086
}
1087
if(errno != ECONNREFUSED or debug){
1088
int e = errno;
1089
perror_plus("connect");
1090
errno = e;
1091
}
1092
goto mandos_end;
1093
}
1094
1095
if(quit_now){
1096
errno = EINTR;
1097
goto mandos_end;
1098
}
1099
break;
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
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
}
736
}
737
}
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
1100
761
}
1101
762
1102
763
const char *out = mandos_protocol_version;
1104
765
while(true){
1105
766
size_t out_size = strlen(out);
1106
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1107
out_size - written));
768
out_size - written));
1108
769
if(ret == -1){
1109
770
int e = errno;
1110
771
perror_plus("write");
1130
791
}
1131
792
1132
793
if(debug){
1133
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1134
795
}
1135
796
1136
797
if(quit_now){
1138
799
goto mandos_end;
1139
800
}
1140
801
1141
/* This casting via intptr_t is to eliminate warning about casting
1142
an int to a pointer type. This is exactly how the GnuTLS Guile
1143
function "set-session-transport-fd!" does it. */
1144
gnutls_transport_set_ptr(session,
1145
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1146
804
1147
805
if(quit_now){
1148
806
errno = EINTR;
1159
817
1160
818
if(ret != GNUTLS_E_SUCCESS){
1161
819
if(debug){
1162
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1163
821
gnutls_perror(ret);
1164
822
}
1165
823
errno = EPROTO;
1169
827
/* Read OpenPGP packet that contains the wanted password */
1170
828
1171
829
if(debug){
1172
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1173
" %s\n", ip);
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
1174
832
}
1175
833
1176
834
while(true){
1181
839
}
1182
840
1183
841
buffer_capacity = incbuffer(&buffer, buffer_length,
1184
buffer_capacity);
842
buffer_capacity);
1185
843
if(buffer_capacity == 0){
1186
844
int e = errno;
1187
845
perror_plus("incbuffer");
1214
872
}
1215
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1216
874
if(ret < 0){
1217
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1218
"***\n");
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1219
876
gnutls_perror(ret);
1220
877
errno = EPROTO;
1221
878
goto mandos_end;
1222
879
}
1223
880
break;
1224
881
default:
1225
fprintf_plus(stderr, "Unknown error while reading data from"
1226
" encrypted session with Mandos server\n");
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
1227
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1228
885
errno = EIO;
1229
886
goto mandos_end;
1234
891
}
1235
892
1236
893
if(debug){
1237
fprintf_plus(stderr, "Closing TLS session\n");
894
fprintf(stderr, "Closing TLS session\n");
1238
895
}
1239
896
1240
897
if(quit_now){
1252
909
1253
910
if(buffer_length > 0){
1254
911
ssize_t decrypted_buffer_size;
1255
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1256
&decrypted_buffer, mc);
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1257
915
if(decrypted_buffer_size >= 0){
1258
916
1259
917
written = 0;
1269
927
if(ret == 0 and ferror(stdout)){
1270
928
int e = errno;
1271
929
if(debug){
1272
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1273
strerror(errno));
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1274
932
}
1275
933
errno = e;
1276
934
goto mandos_end;
1285
943
1286
944
mandos_end:
1287
945
{
1288
if(route_added){
1289
if(not delete_local_route(ip, if_index)){
1290
fprintf_plus(stderr, "Failed to delete local route to %s on"
1291
" interface %d", ip, if_index);
1292
}
1293
}
1294
946
int e = errno;
1295
947
free(decrypted_buffer);
1296
948
free(buffer);
1313
965
return retval;
1314
966
}
1315
967
1316
__attribute__((nonnull))
1317
968
static void resolve_callback(AvahiSServiceResolver *r,
1318
969
AvahiIfIndex interface,
1319
970
AvahiProtocol proto,
1327
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
1328
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1329
980
flags,
1330
void *mc){
1331
if(r == NULL){
1332
return;
1333
}
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1334
983
1335
984
/* Called whenever a service has been resolved successfully or
1336
985
timed out */
1337
986
1338
987
if(quit_now){
1339
avahi_s_service_resolver_free(r);
1340
988
return;
1341
989
}
1342
990
1343
991
switch(event){
1344
992
default:
1345
993
case AVAHI_RESOLVER_FAILURE:
1346
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1347
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1348
domain,
1349
avahi_strerror(avahi_server_errno
1350
(((mandos_context*)mc)->server)));
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)));
1351
997
break;
1352
998
1353
999
case AVAHI_RESOLVER_FOUND:
1355
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1356
1002
avahi_address_snprint(ip, sizeof(ip), address);
1357
1003
if(debug){
1358
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1359
PRIdMAX ") on port %" PRIu16 "\n", name,
1360
host_name, ip, (intmax_t)interface, port);
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);
1361
1007
}
1362
int ret = start_mandos_communication(ip, (in_port_t)port,
1363
interface,
1364
avahi_proto_to_af(proto),
1365
mc);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1366
1010
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1368
1012
} else {
1369
if(not add_server(ip, (in_port_t)port, interface,
1370
avahi_proto_to_af(proto),
1371
&((mandos_context*)mc)->current_server)){
1372
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1373
" list\n", name);
1374
}
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1375
1015
}
1376
1016
}
1377
1017
}
1387
1027
const char *domain,
1388
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1389
1029
flags,
1390
void *mc){
1391
if(b == NULL){
1392
return;
1393
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1394
1032
1395
1033
/* Called whenever a new services becomes available on the LAN or
1396
1034
is removed from the LAN */
1403
1041
default:
1404
1042
case AVAHI_BROWSER_FAILURE:
1405
1043
1406
fprintf_plus(stderr, "(Avahi browser) %s\n",
1407
avahi_strerror(avahi_server_errno
1408
(((mandos_context*)mc)->server)));
1409
avahi_simple_poll_quit(simple_poll);
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1410
1047
return;
1411
1048
1412
1049
case AVAHI_BROWSER_NEW:
1415
1052
the callback function is called the Avahi server will free the
1416
1053
resolver for us. */
1417
1054
1418
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1419
interface, protocol, name, type,
1420
domain, protocol, 0,
1421
resolve_callback, mc) == NULL)
1422
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1423
" %s\n", name,
1424
avahi_strerror(avahi_server_errno
1425
(((mandos_context*)mc)->server)));
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)));
1426
1060
break;
1427
1061
1428
1062
case AVAHI_BROWSER_REMOVE:
1431
1065
case AVAHI_BROWSER_ALL_FOR_NOW:
1432
1066
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1433
1067
if(debug){
1434
fprintf_plus(stderr, "No Mandos server found, still"
1435
" searching...\n");
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1436
1069
}
1437
1070
break;
1438
1071
}
1447
1080
signal_received = sig;
1448
1081
int old_errno = errno;
1449
1082
/* set main loop to exit */
1450
if(simple_poll != NULL){
1451
avahi_simple_poll_quit(simple_poll);
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1452
1085
}
1453
1086
errno = old_errno;
1454
1087
}
1455
1088
1456
__attribute__((nonnull, warn_unused_result))
1457
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1458
1090
int ret;
1459
error_t ret_errno;
1460
1091
1461
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1462
1093
if(s < 0){
1463
ret_errno = errno;
1464
1094
perror_plus("socket");
1465
errno = ret_errno;
1466
1095
return false;
1467
1096
}
1468
1097
strcpy(ifr->ifr_name, ifname);
1469
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1470
1099
if(ret == -1){
1471
1100
if(debug){
1472
ret_errno = errno;
1473
1101
perror_plus("ioctl SIOCGIFFLAGS");
1474
errno = ret_errno;
1475
1102
}
1476
1103
return false;
1477
1104
}
1478
1105
return true;
1479
1106
}
1480
1107
1481
__attribute__((nonnull, warn_unused_result))
1482
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1483
1109
1484
1110
/* Reject the loopback device */
1485
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1486
1112
if(debug){
1487
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1488
ifname);
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1489
1115
}
1490
1116
return false;
1491
1117
}
1492
1118
/* Accept point-to-point devices only if connect_to is specified */
1493
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1494
1120
if(debug){
1495
fprintf_plus(stderr, "Accepting point-to-point interface"
1496
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1497
1123
}
1498
1124
return true;
1499
1125
}
1500
1126
/* Otherwise, reject non-broadcast-capable devices */
1501
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1502
1128
if(debug){
1503
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1504
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1505
1131
}
1506
1132
return false;
1507
1133
}
1508
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1509
1135
if(ifr->ifr_flags & IFF_NOARP){
1510
1136
if(debug){
1511
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1512
ifname);
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1513
1138
}
1514
1139
return false;
1515
1140
}
1516
1141
1517
1142
/* Accept this device */
1518
1143
if(debug){
1519
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1520
1145
}
1521
1146
return true;
1522
1147
}
1526
1151
* corresponds to an acceptable network device.
1527
1152
* (This function is passed to scandir(3) as a filter function.)
1528
1153
*/
1529
__attribute__((nonnull, warn_unused_result))
1530
1154
int good_interface(const struct dirent *if_entry){
1531
1155
if(if_entry->d_name[0] == '.'){
1532
1156
return 0;
1535
1159
struct ifreq ifr;
1536
1160
if(not get_flags(if_entry->d_name, &ifr)){
1537
1161
if(debug){
1538
fprintf_plus(stderr, "Failed to get flags for interface "
1539
"\"%s\"\n", if_entry->d_name);
1540
}
1541
return 0;
1542
}
1543
1544
if(not good_flags(if_entry->d_name, &ifr)){
1545
return 0;
1546
}
1547
return 1;
1548
}
1549
1550
/*
1551
* This function determines if a network interface is up.
1552
*/
1553
__attribute__((nonnull, warn_unused_result))
1554
bool interface_is_up(const char *interface){
1555
struct ifreq ifr;
1556
if(not get_flags(interface, &ifr)){
1557
if(debug){
1558
fprintf_plus(stderr, "Failed to get flags for interface "
1559
"\"%s\"\n", interface);
1560
}
1561
return false;
1562
}
1563
1564
return (bool)(ifr.ifr_flags & IFF_UP);
1565
}
1566
1567
/*
1568
* This function determines if a network interface is running
1569
*/
1570
__attribute__((nonnull, warn_unused_result))
1571
bool interface_is_running(const char *interface){
1572
struct ifreq ifr;
1573
if(not get_flags(interface, &ifr)){
1574
if(debug){
1575
fprintf_plus(stderr, "Failed to get flags for interface "
1576
"\"%s\"\n", interface);
1577
}
1578
return false;
1579
}
1580
1581
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1582
}
1583
1584
__attribute__((nonnull, pure, warn_unused_result))
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
1585
1217
int notdotentries(const struct dirent *direntry){
1586
1218
/* Skip "." and ".." */
1587
1219
if(direntry->d_name[0] == '.'
1594
1226
}
1595
1227
1596
1228
/* Is this directory entry a runnable program? */
1597
__attribute__((nonnull, warn_unused_result))
1598
1229
int runnable_hook(const struct dirent *direntry){
1599
1230
int ret;
1600
size_t sret;
1601
1231
struct stat st;
1602
1232
1603
1233
if((direntry->d_name)[0] == '\0'){
1605
1235
return 0;
1606
1236
}
1607
1237
1608
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1609
"abcdefghijklmnopqrstuvwxyz"
1610
"0123456789"
1611
"_.-");
1612
if((direntry->d_name)[sret] != '\0'){
1613
/* Contains non-allowed characters */
1614
if(debug){
1615
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1616
direntry->d_name);
1617
}
1618
return 0;
1619
}
1620
1621
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
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);
1622
1255
if(ret == -1){
1623
1256
if(debug){
1624
perror_plus("Could not stat hook");
1257
perror_plus("Could not stat plugin");
1625
1258
}
1626
1259
return 0;
1627
1260
}
1628
1261
if(not (S_ISREG(st.st_mode))){
1629
1262
/* Not a regular file */
1630
if(debug){
1631
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1632
direntry->d_name);
1633
}
1634
1263
return 0;
1635
1264
}
1636
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1637
1266
/* Not executable */
1638
if(debug){
1639
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1640
direntry->d_name);
1641
}
1642
1267
return 0;
1643
1268
}
1644
if(debug){
1645
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1646
direntry->d_name);
1647
}
1648
1269
return 1;
1649
1270
}
1650
1271
1651
__attribute__((nonnull, warn_unused_result))
1652
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1653
mandos_context *mc){
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1654
1273
int ret;
1655
1274
struct timespec now;
1656
1275
struct timespec waited_time;
1657
1276
intmax_t block_time;
1658
1277
1659
1278
while(true){
1660
if(mc->current_server == NULL){
1661
if(debug){
1662
fprintf_plus(stderr, "Wait until first server is found."
1663
" No timeout!\n");
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1664
1283
}
1665
1284
ret = avahi_simple_poll_iterate(s, -1);
1666
1285
} else {
1667
if(debug){
1668
fprintf_plus(stderr, "Check current_server if we should run"
1669
" it, or wait\n");
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1670
1289
}
1671
1290
/* the current time */
1672
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1677
1296
/* Calculating in ms how long time between now and server
1678
1297
who we visted longest time ago. Now - last seen. */
1679
1298
waited_time.tv_sec = (now.tv_sec
1680
- mc->current_server->last_seen.tv_sec);
1299
- mc.current_server->last_seen.tv_sec);
1681
1300
waited_time.tv_nsec = (now.tv_nsec
1682
- mc->current_server->last_seen.tv_nsec);
1301
- mc.current_server->last_seen.tv_nsec);
1683
1302
/* total time is 10s/10,000ms.
1684
1303
Converting to s from ms by dividing by 1,000,
1685
1304
and ns to ms by dividing by 1,000,000. */
1687
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1688
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1689
1308
1690
if(debug){
1691
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1692
block_time);
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1693
1311
}
1694
1312
1695
1313
if(block_time <= 0){
1696
ret = start_mandos_communication(mc->current_server->ip,
1697
mc->current_server->port,
1698
mc->current_server->if_index,
1699
mc->current_server->af, mc);
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);
1700
1318
if(ret == 0){
1701
avahi_simple_poll_quit(s);
1319
avahi_simple_poll_quit(mc.simple_poll);
1702
1320
return 0;
1703
1321
}
1704
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1705
&mc->current_server->last_seen);
1323
&mc.current_server->last_seen);
1706
1324
if(ret == -1){
1707
1325
perror_plus("clock_gettime");
1708
1326
return -1;
1709
1327
}
1710
mc->current_server = mc->current_server->next;
1328
mc.current_server = mc.current_server->next;
1711
1329
block_time = 0; /* Call avahi to find new Mandos
1712
1330
servers, but don't block */
1713
1331
}
1715
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1716
1334
}
1717
1335
if(ret != 0){
1718
if(ret > 0 or errno != EINTR){
1336
if (ret > 0 or errno != EINTR) {
1719
1337
return (ret != 1) ? ret : 0;
1720
1338
}
1721
1339
}
1722
1340
}
1723
1341
}
1724
1342
1725
__attribute__((nonnull))
1726
void run_network_hooks(const char *mode, const char *interface,
1727
const float delay){
1728
struct dirent **direntries = NULL;
1729
if(hookdir_fd == -1){
1730
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1731
| O_CLOEXEC);
1732
if(hookdir_fd == -1){
1733
if(errno == ENOENT){
1734
if(debug){
1735
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1736
" found\n", hookdir);
1737
}
1738
} else {
1739
perror_plus("open");
1740
}
1741
return;
1742
}
1743
}
1744
#ifdef __GLIBC__
1745
#if __GLIBC_PREREQ(2, 15)
1746
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1747
runnable_hook, alphasort);
1748
#else /* not __GLIBC_PREREQ(2, 15) */
1749
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1750
alphasort);
1751
#endif /* not __GLIBC_PREREQ(2, 15) */
1752
#else /* not __GLIBC__ */
1753
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1754
alphasort);
1755
#endif /* not __GLIBC__ */
1756
if(numhooks == -1){
1757
perror_plus("scandir");
1758
return;
1759
}
1760
struct dirent *direntry;
1761
int ret;
1762
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1763
if(devnull == -1){
1764
perror_plus("open(\"/dev/null\", O_RDONLY)");
1765
return;
1766
}
1767
for(int i = 0; i < numhooks; i++){
1768
direntry = direntries[i];
1769
if(debug){
1770
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1771
direntry->d_name);
1772
}
1773
pid_t hook_pid = fork();
1774
if(hook_pid == 0){
1775
/* Child */
1776
/* Raise privileges */
1777
errno = raise_privileges_permanently();
1778
if(errno != 0){
1779
perror_plus("Failed to raise privileges");
1780
_exit(EX_NOPERM);
1781
}
1782
/* Set group */
1783
errno = 0;
1784
ret = setgid(0);
1785
if(ret == -1){
1786
perror_plus("setgid");
1787
_exit(EX_NOPERM);
1788
}
1789
/* Reset supplementary groups */
1790
errno = 0;
1791
ret = setgroups(0, NULL);
1792
if(ret == -1){
1793
perror_plus("setgroups");
1794
_exit(EX_NOPERM);
1795
}
1796
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1797
if(ret == -1){
1798
perror_plus("setenv");
1799
_exit(EX_OSERR);
1800
}
1801
ret = setenv("DEVICE", interface, 1);
1802
if(ret == -1){
1803
perror_plus("setenv");
1804
_exit(EX_OSERR);
1805
}
1806
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1807
if(ret == -1){
1808
perror_plus("setenv");
1809
_exit(EX_OSERR);
1810
}
1811
ret = setenv("MODE", mode, 1);
1812
if(ret == -1){
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
char *delaystring;
1817
ret = asprintf(&delaystring, "%f", (double)delay);
1818
if(ret == -1){
1819
perror_plus("asprintf");
1820
_exit(EX_OSERR);
1821
}
1822
ret = setenv("DELAY", delaystring, 1);
1823
if(ret == -1){
1824
free(delaystring);
1825
perror_plus("setenv");
1826
_exit(EX_OSERR);
1827
}
1828
free(delaystring);
1829
if(connect_to != NULL){
1830
ret = setenv("CONNECT", connect_to, 1);
1831
if(ret == -1){
1832
perror_plus("setenv");
1833
_exit(EX_OSERR);
1834
}
1835
}
1836
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1837
direntry->d_name,
1838
O_RDONLY));
1839
if(hook_fd == -1){
1840
perror_plus("openat");
1841
_exit(EXIT_FAILURE);
1842
}
1843
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1844
perror_plus("close");
1845
_exit(EXIT_FAILURE);
1846
}
1847
ret = dup2(devnull, STDIN_FILENO);
1848
if(ret == -1){
1849
perror_plus("dup2(devnull, STDIN_FILENO)");
1850
_exit(EX_OSERR);
1851
}
1852
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1853
if(ret == -1){
1854
perror_plus("close");
1855
_exit(EX_OSERR);
1856
}
1857
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1858
if(ret == -1){
1859
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1860
_exit(EX_OSERR);
1861
}
1862
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1863
environ) == -1){
1864
perror_plus("fexecve");
1865
_exit(EXIT_FAILURE);
1866
}
1867
} else {
1868
if(hook_pid == -1){
1869
perror_plus("fork");
1870
free(direntry);
1871
continue;
1872
}
1873
int status;
1874
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1875
perror_plus("waitpid");
1876
free(direntry);
1877
continue;
1878
}
1879
if(WIFEXITED(status)){
1880
if(WEXITSTATUS(status) != 0){
1881
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1882
" with status %d\n", direntry->d_name,
1883
WEXITSTATUS(status));
1884
free(direntry);
1885
continue;
1886
}
1887
} else if(WIFSIGNALED(status)){
1888
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1889
" signal %d\n", direntry->d_name,
1890
WTERMSIG(status));
1891
free(direntry);
1892
continue;
1893
} else {
1894
fprintf_plus(stderr, "Warning: network hook \"%s\""
1895
" crashed\n", direntry->d_name);
1896
free(direntry);
1897
continue;
1898
}
1899
}
1900
if(debug){
1901
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1902
direntry->d_name);
1903
}
1904
free(direntry);
1905
}
1906
free(direntries);
1907
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1908
perror_plus("close");
1909
} else {
1910
hookdir_fd = -1;
1911
}
1912
close(devnull);
1913
}
1914
1915
__attribute__((nonnull, warn_unused_result))
1916
error_t bring_up_interface(const char *const interface,
1917
const float delay){
1918
error_t old_errno = errno;
1919
int ret;
1920
struct ifreq network;
1921
unsigned int if_index = if_nametoindex(interface);
1922
if(if_index == 0){
1923
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1924
errno = old_errno;
1925
return ENXIO;
1926
}
1927
1928
if(quit_now){
1929
errno = old_errno;
1930
return EINTR;
1931
}
1932
1933
if(not interface_is_up(interface)){
1934
error_t ret_errno = 0, ioctl_errno = 0;
1935
if(not get_flags(interface, &network)){
1936
ret_errno = errno;
1937
fprintf_plus(stderr, "Failed to get flags for interface "
1938
"\"%s\"\n", interface);
1939
errno = old_errno;
1940
return ret_errno;
1941
}
1942
network.ifr_flags |= IFF_UP; /* set flag */
1943
1944
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1945
if(sd == -1){
1946
ret_errno = errno;
1947
perror_plus("socket");
1948
errno = old_errno;
1949
return ret_errno;
1950
}
1951
1952
if(quit_now){
1953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1954
if(ret == -1){
1955
perror_plus("close");
1956
}
1957
errno = old_errno;
1958
return EINTR;
1959
}
1960
1961
if(debug){
1962
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1963
interface);
1964
}
1965
1966
/* Raise privileges */
1967
ret_errno = raise_privileges();
1968
if(ret_errno != 0){
1969
errno = ret_errno;
1970
perror_plus("Failed to raise privileges");
1971
}
1972
1973
#ifdef __linux__
1974
int ret_linux;
1975
bool restore_loglevel = false;
1976
if(ret_errno == 0){
1977
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1978
messages about the network interface to mess up the prompt */
1979
ret_linux = klogctl(8, NULL, 5);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
} else {
1983
restore_loglevel = true;
1984
}
1985
}
1986
#endif /* __linux__ */
1987
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1988
ioctl_errno = errno;
1989
#ifdef __linux__
1990
if(restore_loglevel){
1991
ret_linux = klogctl(7, NULL, 0);
1992
if(ret_linux == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
1998
/* If raise_privileges() succeeded above */
1999
if(ret_errno == 0){
2000
/* Lower privileges */
2001
ret_errno = lower_privileges();
2002
if(ret_errno != 0){
2003
errno = ret_errno;
2004
perror_plus("Failed to lower privileges");
2005
}
2006
}
2007
2008
/* Close the socket */
2009
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2010
if(ret == -1){
2011
perror_plus("close");
2012
}
2013
2014
if(ret_setflags == -1){
2015
errno = ioctl_errno;
2016
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2017
errno = old_errno;
2018
return ioctl_errno;
2019
}
2020
} else if(debug){
2021
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2022
interface);
2023
}
2024
2025
/* Sleep checking until interface is running.
2026
Check every 0.25s, up to total time of delay */
2027
for(int i=0; i < delay * 4; i++){
2028
if(interface_is_running(interface)){
2029
break;
2030
}
2031
struct timespec sleeptime = { .tv_nsec = 250000000 };
2032
ret = nanosleep(&sleeptime, NULL);
2033
if(ret == -1 and errno != EINTR){
2034
perror_plus("nanosleep");
2035
}
2036
}
2037
2038
errno = old_errno;
2039
return 0;
2040
}
2041
2042
__attribute__((nonnull, warn_unused_result))
2043
error_t take_down_interface(const char *const interface){
2044
error_t old_errno = errno;
2045
struct ifreq network;
2046
unsigned int if_index = if_nametoindex(interface);
2047
if(if_index == 0){
2048
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2049
errno = old_errno;
2050
return ENXIO;
2051
}
2052
if(interface_is_up(interface)){
2053
error_t ret_errno = 0, ioctl_errno = 0;
2054
if(not get_flags(interface, &network) and debug){
2055
ret_errno = errno;
2056
fprintf_plus(stderr, "Failed to get flags for interface "
2057
"\"%s\"\n", interface);
2058
errno = old_errno;
2059
return ret_errno;
2060
}
2061
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2062
2063
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2064
if(sd == -1){
2065
ret_errno = errno;
2066
perror_plus("socket");
2067
errno = old_errno;
2068
return ret_errno;
2069
}
2070
2071
if(debug){
2072
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2073
interface);
2074
}
2075
2076
/* Raise privileges */
2077
ret_errno = raise_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to raise privileges");
2081
}
2082
2083
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2084
ioctl_errno = errno;
2085
2086
/* If raise_privileges() succeeded above */
2087
if(ret_errno == 0){
2088
/* Lower privileges */
2089
ret_errno = lower_privileges();
2090
if(ret_errno != 0){
2091
errno = ret_errno;
2092
perror_plus("Failed to lower privileges");
2093
}
2094
}
2095
2096
/* Close the socket */
2097
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2098
if(ret == -1){
2099
perror_plus("close");
2100
}
2101
2102
if(ret_setflags == -1){
2103
errno = ioctl_errno;
2104
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2105
errno = old_errno;
2106
return ioctl_errno;
2107
}
2108
} else if(debug){
2109
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2110
interface);
2111
}
2112
2113
errno = old_errno;
2114
return 0;
2115
}
2116
2117
1343
int main(int argc, char *argv[]){
2118
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2119
.priority = "SECURE256:!CTYPE-X.509:"
2120
"+CTYPE-OPENPGP", .current_server = NULL,
2121
.interfaces = NULL, .interfaces_size = 0 };
2122
1344
AvahiSServiceBrowser *sb = NULL;
2123
error_t ret_errno;
1345
int error;
2124
1346
int ret;
2125
1347
intmax_t tmpmax;
2126
1348
char *tmp;
2127
1349
int exitcode = EXIT_SUCCESS;
2128
char *interfaces_to_take_down = NULL;
2129
size_t interfaces_to_take_down_size = 0;
2130
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2131
char old_tempdir[] = "/tmp/mandosXXXXXX";
2132
char *tempdir = NULL;
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;
2133
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2134
1359
const char *seckey = PATHDIR "/" SECKEY;
2135
1360
const char *pubkey = PATHDIR "/" PUBKEY;
2136
char *interfaces_hooks = NULL;
2137
1361
2138
1362
bool gnutls_initialized = false;
2139
1363
bool gpgme_initialized = false;
2201
1425
.group = 2 },
2202
1426
{ .name = "retry", .key = 132,
2203
1427
.arg = "SECONDS",
2204
.doc = "Retry interval used when denied by the Mandos server",
2205
.group = 2 },
2206
{ .name = "network-hook-dir", .key = 133,
2207
.arg = "DIR",
2208
.doc = "Directory where network hooks are located",
1428
.doc = "Retry interval used when denied by the mandos server",
2209
1429
.group = 2 },
2210
1430
/*
2211
1431
* These reproduce what we would get without ARGP_NO_HELP
2230
1450
connect_to = arg;
2231
1451
break;
2232
1452
case 'i': /* --interface */
2233
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2234
arg, (int)',');
2235
if(ret_errno != 0){
2236
argp_error(state, "%s", strerror(ret_errno));
2237
}
1453
interface = arg;
2238
1454
break;
2239
1455
case 's': /* --seckey */
2240
1456
seckey = arg;
2269
1485
argp_error(state, "Bad retry interval");
2270
1486
}
2271
1487
break;
2272
case 133: /* --network-hook-dir */
2273
hookdir = arg;
2274
break;
2275
1488
/*
2276
1489
* These reproduce what we would get without ARGP_NO_HELP
2277
1490
*/
2283
1496
argp_state_help(state, state->out_stream,
2284
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2285
1498
case 'V': /* --version */
2286
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
2287
1500
exit(argp_err_exit_status);
2288
1501
break;
2289
1502
default:
2312
1525
goto end;
2313
1526
}
2314
1527
}
2315
1528
2316
1529
{
2317
1530
/* Work around Debian bug #633582:
2318
1531
<http://bugs.debian.org/633582> */
2319
2320
/* Re-raise privileges */
2321
ret_errno = raise_privileges();
2322
if(ret_errno != 0){
2323
errno = ret_errno;
2324
perror_plus("Failed to raise privileges");
2325
} else {
2326
struct stat st;
2327
2328
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2329
int seckey_fd = open(seckey, O_RDONLY);
2330
if(seckey_fd == -1){
2331
perror_plus("open");
2332
} else {
2333
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2334
if(ret == -1){
2335
perror_plus("fstat");
2336
} else {
2337
if(S_ISREG(st.st_mode)
2338
and st.st_uid == 0 and st.st_gid == 0){
2339
ret = fchown(seckey_fd, uid, gid);
2340
if(ret == -1){
2341
perror_plus("fchown");
2342
}
2343
}
2344
}
2345
TEMP_FAILURE_RETRY(close(seckey_fd));
2346
}
2347
}
2348
2349
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2350
int pubkey_fd = open(pubkey, O_RDONLY);
2351
if(pubkey_fd == -1){
2352
perror_plus("open");
2353
} else {
2354
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2355
if(ret == -1){
2356
perror_plus("fstat");
2357
} else {
2358
if(S_ISREG(st.st_mode)
2359
and st.st_uid == 0 and st.st_gid == 0){
2360
ret = fchown(pubkey_fd, uid, gid);
2361
if(ret == -1){
2362
perror_plus("fchown");
2363
}
2364
}
2365
}
2366
TEMP_FAILURE_RETRY(close(pubkey_fd));
2367
}
2368
}
2369
2370
/* Lower privileges */
2371
ret_errno = lower_privileges();
2372
if(ret_errno != 0){
2373
errno = ret_errno;
2374
perror_plus("Failed to lower privileges");
2375
}
2376
}
2377
}
2378
2379
/* Remove invalid interface names (except "none") */
2380
{
2381
char *interface = NULL;
2382
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2383
interface))){
2384
if(strcmp(interface, "none") != 0
2385
and if_nametoindex(interface) == 0){
2386
if(interface[0] != '\0'){
2387
fprintf_plus(stderr, "Not using nonexisting interface"
2388
" \"%s\"\n", interface);
2389
}
2390
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2391
interface = NULL;
2392
}
2393
}
2394
}
2395
2396
/* Run network hooks */
2397
{
2398
if(mc.interfaces != NULL){
2399
interfaces_hooks = malloc(mc.interfaces_size);
2400
if(interfaces_hooks == NULL){
2401
perror_plus("malloc");
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
setenv("DEVICE", interface, 1);
1612
setenv("VERBOSE", debug ? "1" : "0", 1);
1613
setenv("MODE", "start", 1);
1614
/* setenv( XXX more here */
1615
ret = execl(fullname, direntry->d_name, "start", NULL);
1616
perror_plus("execl");
1617
}
1618
free(fullname);
1619
if(quit_now){
2402
1620
goto end;
2403
1621
}
2404
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2405
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2406
1622
}
2407
run_network_hooks("start", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
1623
close(devnull);
2409
1624
}
2410
1625
2411
1626
if(not debug){
2412
1627
avahi_set_log_function(empty_log);
2413
1628
}
2414
1629
1630
if(interface[0] == '\0'){
1631
struct dirent **direntries;
1632
/* First look for interfaces that are up */
1633
ret = scandir(sys_class_net, &direntries, up_interface,
1634
alphasort);
1635
if(ret == 0){
1636
/* No up interfaces, look for any good interfaces */
1637
free(direntries);
1638
ret = scandir(sys_class_net, &direntries, good_interface,
1639
alphasort);
1640
}
1641
if(ret >= 1){
1642
/* Pick the first interface returned */
1643
interface = strdup(direntries[0]->d_name);
1644
if(debug){
1645
fprintf(stderr, "Using interface \"%s\"\n", interface);
1646
}
1647
if(interface == NULL){
1648
perror_plus("malloc");
1649
free(direntries);
1650
exitcode = EXIT_FAILURE;
1651
goto end;
1652
}
1653
free(direntries);
1654
} else {
1655
free(direntries);
1656
fprintf(stderr, "Could not find a network interface\n");
1657
exitcode = EXIT_FAILURE;
1658
goto end;
1659
}
1660
}
1661
2415
1662
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2416
1663
from the signal handler */
2417
1664
/* Initialize the pseudo-RNG for Avahi */
2418
1665
srand((unsigned int) time(NULL));
2419
simple_poll = avahi_simple_poll_new();
2420
if(simple_poll == NULL){
2421
fprintf_plus(stderr,
2422
"Avahi: Failed to create simple poll object.\n");
1666
mc.simple_poll = avahi_simple_poll_new();
1667
if(mc.simple_poll == NULL){
1668
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2423
1669
exitcode = EX_UNAVAILABLE;
2424
1670
goto end;
2425
1671
}
2487
1733
}
2488
1734
}
2489
1735
2490
/* If no interfaces were specified, make a list */
2491
if(mc.interfaces == NULL){
2492
struct dirent **direntries = NULL;
2493
/* Look for any good interfaces */
2494
ret = scandir(sys_class_net, &direntries, good_interface,
2495
alphasort);
2496
if(ret >= 1){
2497
/* Add all found interfaces to interfaces list */
2498
for(int i = 0; i < ret; ++i){
2499
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2500
direntries[i]->d_name);
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("argz_add");
2504
free(direntries[i]);
2505
continue;
2506
}
2507
if(debug){
2508
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2509
direntries[i]->d_name);
2510
}
2511
free(direntries[i]);
2512
}
2513
free(direntries);
1736
/* If the interface is down, bring it up */
1737
if(strcmp(interface, "none") != 0){
1738
if_index = (AvahiIfIndex) if_nametoindex(interface);
1739
if(if_index == 0){
1740
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1741
exitcode = EX_UNAVAILABLE;
1742
goto end;
1743
}
1744
1745
if(quit_now){
1746
goto end;
1747
}
1748
1749
/* Re-raise priviliges */
1750
errno = 0;
1751
ret = seteuid(0);
1752
if(ret == -1){
1753
perror_plus("seteuid");
1754
}
1755
1756
#ifdef __linux__
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret = klogctl(8, NULL, 5);
1760
bool restore_loglevel = true;
1761
if(ret == -1){
1762
restore_loglevel = false;
1763
perror_plus("klogctl");
1764
}
1765
#endif /* __linux__ */
1766
1767
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1768
if(sd < 0){
1769
perror_plus("socket");
1770
exitcode = EX_OSERR;
1771
#ifdef __linux__
1772
if(restore_loglevel){
1773
ret = klogctl(7, NULL, 0);
1774
if(ret == -1){
1775
perror_plus("klogctl");
1776
}
1777
}
1778
#endif /* __linux__ */
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
goto end;
1786
}
1787
strcpy(network.ifr_name, interface);
1788
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1789
if(ret == -1){
1790
perror_plus("ioctl SIOCGIFFLAGS");
1791
#ifdef __linux__
1792
if(restore_loglevel){
1793
ret = klogctl(7, NULL, 0);
1794
if(ret == -1){
1795
perror_plus("klogctl");
1796
}
1797
}
1798
#endif /* __linux__ */
1799
exitcode = EX_OSERR;
1800
/* Lower privileges */
1801
errno = 0;
1802
ret = seteuid(uid);
1803
if(ret == -1){
1804
perror_plus("seteuid");
1805
}
1806
goto end;
1807
}
1808
if((network.ifr_flags & IFF_UP) == 0){
1809
network.ifr_flags |= IFF_UP;
1810
take_down_interface = true;
1811
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1812
if(ret == -1){
1813
take_down_interface = false;
1814
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1815
exitcode = EX_OSERR;
1816
#ifdef __linux__
1817
if(restore_loglevel){
1818
ret = klogctl(7, NULL, 0);
1819
if(ret == -1){
1820
perror_plus("klogctl");
1821
}
1822
}
1823
#endif /* __linux__ */
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
}
1833
/* Sleep checking until interface is running.
1834
Check every 0.25s, up to total time of delay */
1835
for(int i=0; i < delay * 4; i++){
1836
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1837
if(ret == -1){
1838
perror_plus("ioctl SIOCGIFFLAGS");
1839
} else if(network.ifr_flags & IFF_RUNNING){
1840
break;
1841
}
1842
struct timespec sleeptime = { .tv_nsec = 250000000 };
1843
ret = nanosleep(&sleeptime, NULL);
1844
if(ret == -1 and errno != EINTR){
1845
perror_plus("nanosleep");
1846
}
1847
}
1848
if(not take_down_interface){
1849
/* We won't need the socket anymore */
1850
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1851
if(ret == -1){
1852
perror_plus("close");
1853
}
1854
}
1855
#ifdef __linux__
1856
if(restore_loglevel){
1857
/* Restores kernel loglevel to default */
1858
ret = klogctl(7, NULL, 0);
1859
if(ret == -1){
1860
perror_plus("klogctl");
1861
}
1862
}
1863
#endif /* __linux__ */
1864
/* Lower privileges */
1865
errno = 0;
1866
if(take_down_interface){
1867
/* Lower privileges */
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
2514
1872
} else {
2515
if(ret == 0){
2516
free(direntries);
2517
}
2518
fprintf_plus(stderr, "Could not find a network interface\n");
2519
exitcode = EXIT_FAILURE;
2520
goto end;
2521
}
2522
}
2523
2524
/* Bring up interfaces which are down, and remove any "none"s */
2525
{
2526
char *interface = NULL;
2527
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2528
interface))){
2529
/* If interface name is "none", stop bringing up interfaces.
2530
Also remove all instances of "none" from the list */
2531
if(strcmp(interface, "none") == 0){
2532
argz_delete(&mc.interfaces, &mc.interfaces_size,
2533
interface);
2534
interface = NULL;
2535
while((interface = argz_next(mc.interfaces,
2536
mc.interfaces_size, interface))){
2537
if(strcmp(interface, "none") == 0){
2538
argz_delete(&mc.interfaces, &mc.interfaces_size,
2539
interface);
2540
interface = NULL;
2541
}
2542
}
2543
break;
2544
}
2545
bool interface_was_up = interface_is_up(interface);
2546
errno = bring_up_interface(interface, delay);
2547
if(not interface_was_up){
2548
if(errno != 0){
2549
perror_plus("Failed to bring up interface");
2550
} else {
2551
errno = argz_add(&interfaces_to_take_down,
2552
&interfaces_to_take_down_size,
2553
interface);
2554
if(errno != 0){
2555
perror_plus("argz_add");
2556
}
2557
}
2558
}
2559
}
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces were brought up\n");
2562
}
2563
}
2564
2565
/* If we only got one interface, explicitly use only that one */
2566
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2567
if(debug){
2568
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2569
mc.interfaces);
2570
}
2571
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1873
/* Lower privileges permanently */
1874
ret = setuid(uid);
1875
if(ret == -1){
1876
perror_plus("setuid");
1877
}
1878
}
2572
1879
}
2573
1880
2574
1881
if(quit_now){
2575
1882
goto end;
2576
1883
}
2577
1884
2578
ret = init_gnutls_global(pubkey, seckey, &mc);
1885
ret = init_gnutls_global(pubkey, seckey);
2579
1886
if(ret == -1){
2580
fprintf_plus(stderr, "init_gnutls_global failed\n");
1887
fprintf(stderr, "init_gnutls_global failed\n");
2581
1888
exitcode = EX_UNAVAILABLE;
2582
1889
goto end;
2583
1890
} else {
2588
1895
goto end;
2589
1896
}
2590
1897
2591
/* Try /run/tmp before /tmp */
2592
tempdir = mkdtemp(run_tempdir);
2593
if(tempdir == NULL and errno == ENOENT){
2594
if(debug){
2595
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2596
run_tempdir, old_tempdir);
2597
}
2598
tempdir = mkdtemp(old_tempdir);
2599
}
2600
if(tempdir == NULL){
1898
if(mkdtemp(tempdir) == NULL){
2601
1899
perror_plus("mkdtemp");
2602
1900
goto end;
2603
1901
}
1902
tempdir_created = true;
2604
1903
2605
1904
if(quit_now){
2606
1905
goto end;
2607
1906
}
2608
1907
2609
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2610
fprintf_plus(stderr, "init_gpgme failed\n");
1908
if(not init_gpgme(pubkey, seckey, tempdir)){
1909
fprintf(stderr, "init_gpgme failed\n");
2611
1910
exitcode = EX_UNAVAILABLE;
2612
1911
goto end;
2613
1912
} else {
2622
1921
/* Connect directly, do not use Zeroconf */
2623
1922
/* (Mainly meant for debugging) */
2624
1923
char *address = strrchr(connect_to, ':');
2625
2626
1924
if(address == NULL){
2627
fprintf_plus(stderr, "No colon in address\n");
1925
fprintf(stderr, "No colon in address\n");
2628
1926
exitcode = EX_USAGE;
2629
1927
goto end;
2630
1928
}
2633
1931
goto end;
2634
1932
}
2635
1933
2636
in_port_t port;
1934
uint16_t port;
2637
1935
errno = 0;
2638
1936
tmpmax = strtoimax(address+1, &tmp, 10);
2639
1937
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2640
or tmpmax != (in_port_t)tmpmax){
2641
fprintf_plus(stderr, "Bad port number\n");
1938
or tmpmax != (uint16_t)tmpmax){
1939
fprintf(stderr, "Bad port number\n");
2642
1940
exitcode = EX_USAGE;
2643
1941
goto end;
2644
1942
}
2645
1943
2646
1944
if(quit_now){
2647
1945
goto end;
2648
1946
}
2649
1947
2650
port = (in_port_t)tmpmax;
1948
port = (uint16_t)tmpmax;
2651
1949
*address = '\0';
2652
1950
/* Colon in address indicates IPv6 */
2653
1951
int af;
2669
1967
}
2670
1968
2671
1969
while(not quit_now){
2672
ret = start_mandos_communication(address, port, if_index, af,
2673
&mc);
1970
ret = start_mandos_communication(address, port, if_index, af);
2674
1971
if(quit_now or ret == 0){
2675
1972
break;
2676
1973
}
2677
1974
if(debug){
2678
fprintf_plus(stderr, "Retrying in %d seconds\n",
2679
(int)retry_interval);
1975
fprintf(stderr, "Retrying in %d seconds\n",
1976
(int)retry_interval);
2680
1977
}
2681
sleep((unsigned int)retry_interval);
1978
sleep((int)retry_interval);
2682
1979
}
2683
1980
2684
if(not quit_now){
1981
if (not quit_now){
2685
1982
exitcode = EXIT_SUCCESS;
2686
1983
}
2687
1984
2702
1999
config.publish_domain = 0;
2703
2000
2704
2001
/* Allocate a new server */
2705
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2706
&config, NULL, NULL, &ret_errno);
2002
mc.server = avahi_server_new(avahi_simple_poll_get
2003
(mc.simple_poll), &config, NULL,
2004
NULL, &error);
2707
2005
2708
2006
/* Free the Avahi configuration data */
2709
2007
avahi_server_config_free(&config);
2711
2009
2712
2010
/* Check if creating the Avahi server object succeeded */
2713
2011
if(mc.server == NULL){
2714
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2715
avahi_strerror(ret_errno));
2012
fprintf(stderr, "Failed to create Avahi server: %s\n",
2013
avahi_strerror(error));
2716
2014
exitcode = EX_UNAVAILABLE;
2717
2015
goto end;
2718
2016
}
2724
2022
/* Create the Avahi service browser */
2725
2023
sb = avahi_s_service_browser_new(mc.server, if_index,
2726
2024
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2727
NULL, 0, browse_callback,
2728
(void *)&mc);
2025
NULL, 0, browse_callback, NULL);
2729
2026
if(sb == NULL){
2730
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2731
avahi_strerror(avahi_server_errno(mc.server)));
2027
fprintf(stderr, "Failed to create service browser: %s\n",
2028
avahi_strerror(avahi_server_errno(mc.server)));
2732
2029
exitcode = EX_UNAVAILABLE;
2733
2030
goto end;
2734
2031
}
2740
2037
/* Run the main loop */
2741
2038
2742
2039
if(debug){
2743
fprintf_plus(stderr, "Starting Avahi loop search\n");
2040
fprintf(stderr, "Starting Avahi loop search\n");
2744
2041
}
2745
2746
ret = avahi_loop_with_timeout(simple_poll,
2747
(int)(retry_interval * 1000), &mc);
2042
2043
ret = avahi_loop_with_timeout(mc.simple_poll,
2044
(int)(retry_interval * 1000));
2748
2045
if(debug){
2749
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2750
(ret == 0) ? "successfully" : "with error");
2046
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2047
(ret == 0) ? "successfully" : "with error");
2751
2048
}
2752
2049
2753
2050
end:
2754
2051
2755
2052
if(debug){
2756
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2053
fprintf(stderr, "%s exiting\n", argv[0]);
2757
2054
}
2758
2055
2759
2056
/* Cleanup things */
2760
free(mc.interfaces);
2761
2762
2057
if(sb != NULL)
2763
2058
avahi_s_service_browser_free(sb);
2764
2059
2765
2060
if(mc.server != NULL)
2766
2061
avahi_server_free(mc.server);
2767
2062
2768
if(simple_poll != NULL)
2769
avahi_simple_poll_free(simple_poll);
2063
if(mc.simple_poll != NULL)
2064
avahi_simple_poll_free(mc.simple_poll);
2770
2065
2771
2066
if(gnutls_initialized){
2772
2067
gnutls_certificate_free_credentials(mc.cred);
2777
2072
if(gpgme_initialized){
2778
2073
gpgme_release(mc.ctx);
2779
2074
}
2780
2075
2781
2076
/* Cleans up the circular linked list of Mandos servers the client
2782
2077
has seen */
2783
2078
if(mc.current_server != NULL){
2784
2079
mc.current_server->prev->next = NULL;
2785
2080
while(mc.current_server != NULL){
2786
2081
server *next = mc.current_server->next;
2787
#ifdef __GNUC__
2788
#pragma GCC diagnostic push
2789
#pragma GCC diagnostic ignored "-Wcast-qual"
2790
#endif
2791
free((char *)(mc.current_server->ip));
2792
#ifdef __GNUC__
2793
#pragma GCC diagnostic pop
2794
#endif
2795
2082
free(mc.current_server);
2796
2083
mc.current_server = next;
2797
2084
}
2798
2085
}
2799
2086
2800
/* Re-raise privileges */
2801
{
2802
ret_errno = raise_privileges();
2803
if(ret_errno != 0){
2804
errno = ret_errno;
2805
perror_plus("Failed to raise privileges");
2806
} else {
2807
2808
/* Run network hooks */
2809
run_network_hooks("stop", interfaces_hooks != NULL ?
2810
interfaces_hooks : "", delay);
2811
2812
/* Take down the network interfaces which were brought up */
2813
{
2814
char *interface = NULL;
2815
while((interface=argz_next(interfaces_to_take_down,
2816
interfaces_to_take_down_size,
2817
interface))){
2818
ret_errno = take_down_interface(interface);
2819
if(ret_errno != 0){
2820
errno = ret_errno;
2821
perror_plus("Failed to take down interface");
2822
}
2823
}
2824
if(debug and (interfaces_to_take_down == NULL)){
2825
fprintf_plus(stderr, "No interfaces needed to be taken"
2826
" down\n");
2827
}
2828
}
2087
/* XXX run network hooks "stop" here */
2088
2089
/* Take down the network interface */
2090
if(take_down_interface){
2091
/* Re-raise priviliges */
2092
errno = 0;
2093
ret = seteuid(0);
2094
if(ret == -1){
2095
perror_plus("seteuid");
2829
2096
}
2830
2831
ret_errno = lower_privileges_permanently();
2832
if(ret_errno != 0){
2833
errno = ret_errno;
2834
perror_plus("Failed to lower privileges permanently");
2097
if(geteuid() == 0){
2098
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2099
if(ret == -1){
2100
perror_plus("ioctl SIOCGIFFLAGS");
2101
} else if(network.ifr_flags & IFF_UP) {
2102
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2104
if(ret == -1){
2105
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2106
}
2107
}
2108
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2109
if(ret == -1){
2110
perror_plus("close");
2111
}
2112
/* Lower privileges permanently */
2113
errno = 0;
2114
ret = setuid(uid);
2115
if(ret == -1){
2116
perror_plus("setuid");
2117
}
2835
2118
}
2836
2119
}
2837
2120
2838
free(interfaces_to_take_down);
2839
free(interfaces_hooks);
2840
2841
2121
/* Removes the GPGME temp directory and all files inside */
2842
if(tempdir != NULL){
2122
if(tempdir_created){
2843
2123
struct dirent **direntries = NULL;
2844
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2845
| O_NOFOLLOW
2846
| O_DIRECTORY
2847
| O_PATH));
2848
if(tempdir_fd == -1){
2849
perror_plus("open");
2850
} else {
2851
#ifdef __GLIBC__
2852
#if __GLIBC_PREREQ(2, 15)
2853
int numentries = scandirat(tempdir_fd, ".", &direntries,
2854
notdotentries, alphasort);
2855
#else /* not __GLIBC_PREREQ(2, 15) */
2856
int numentries = scandir(tempdir, &direntries, notdotentries,
2857
alphasort);
2858
#endif /* not __GLIBC_PREREQ(2, 15) */
2859
#else /* not __GLIBC__ */
2860
int numentries = scandir(tempdir, &direntries, notdotentries,
2861
alphasort);
2862
#endif /* not __GLIBC__ */
2863
if(numentries >= 0){
2864
for(int i = 0; i < numentries; i++){
2865
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2866
if(ret == -1){
2867
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2868
" \"%s\", 0): %s\n", tempdir,
2869
direntries[i]->d_name, strerror(errno));
2870
}
2871
free(direntries[i]);
2872
}
2873
2874
/* need to clean even if 0 because man page doesn't specify */
2875
free(direntries);
2876
if(numentries == -1){
2877
perror_plus("scandir");
2878
}
2879
ret = rmdir(tempdir);
2880
if(ret == -1 and errno != ENOENT){
2881
perror_plus("rmdir");
2882
}
2124
struct dirent *direntry = NULL;
2125
int numentries = scandir(tempdir, &direntries, notdotentries,
2126
alphasort);
2127
if (numentries > 0){
2128
for(int i = 0; i < numentries; i++){
2129
direntry = direntries[i];
2130
char *fullname = NULL;
2131
ret = asprintf(&fullname, "%s/%s", tempdir,
2132
direntry->d_name);
2133
if(ret < 0){
2134
perror_plus("asprintf");
2135
continue;
2136
}
2137
ret = remove(fullname);
2138
if(ret == -1){
2139
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2140
strerror(errno));
2141
}
2142
free(fullname);
2883
2143
}
2884
TEMP_FAILURE_RETRY(close(tempdir_fd));
2144
}
2145
2146
/* need to clean even if 0 because man page doesn't specify */
2147
free(direntries);
2148
if (numentries == -1){
2149
perror_plus("scandir");
2150
}
2151
ret = rmdir(tempdir);
2152
if(ret == -1 and errno != ENOENT){
2153
perror_plus("rmdir");
2885
2154
}
2886
2155
}
2887
2156
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0