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- Committer: Teddy Hogeborn
- Date: 2014-03-28 22:32:21 UTC
- Revision ID: teddy@recompile.se-20140328223221-w579qlvlex5if3dn
Fix location and format of signing key file.
* debian/upstream/signing-key.asc: Added.
* debian/upstream-signing-key.pgp: Removed.
* debian/upstream/signing-key.asc: Added.
* debian/upstream-signing-key.pgp: Removed.
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
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
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
88
97
89
98
#ifdef __linux__
90
99
#include <sys/klog.h> /* klogctl() */
108
117
init_gnutls_session(),
109
118
GNUTLS_* */
110
119
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
113
122
114
123
/* GPGME */
115
124
#include <gpgme.h> /* All GPGME types, constants and
127
136
128
137
bool debug = false;
129
138
static const char mandos_protocol_version[] = "1";
130
const char *argp_program_version = "mandos-client " VERSION;
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
132
141
static const char sys_class_net[] = "/sys/class/net";
133
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
134
146
135
147
/* Doubly linked list that need to be circularly linked when used */
136
148
typedef struct server{
137
149
const char *ip;
138
uint16_t port;
150
in_port_t port;
139
151
AvahiIfIndex if_index;
140
152
int af;
141
153
struct timespec last_seen;
145
157
146
158
/* Used for passing in values through the Avahi callback functions */
147
159
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
160
AvahiServer *server;
150
161
gnutls_certificate_credentials_t cred;
151
162
unsigned int dh_bits;
153
164
const char *priority;
154
165
gpgme_ctx_t ctx;
155
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
156
169
} mandos_context;
157
170
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 };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
163
173
164
174
sig_atomic_t quit_now = 0;
165
175
int signal_received = 0;
166
176
167
177
/* Function to use when printing errors */
168
178
void perror_plus(const char *print_text){
179
int e = errno;
169
180
fprintf(stderr, "Mandos plugin %s: ",
170
181
program_invocation_short_name);
182
errno = e;
171
183
perror(print_text);
172
184
}
173
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
174
196
/*
175
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
198
* bytes. "buffer_capacity" is how much is currently allocated,
177
199
* "buffer_length" is how much is already used.
178
200
*/
201
__attribute__((nonnull, warn_unused_result))
179
202
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
203
size_t buffer_capacity){
181
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
184
211
return 0;
185
212
}
213
*buffer = new_buf;
186
214
buffer_capacity += BUFFER_SIZE;
187
215
}
188
216
return buffer_capacity;
189
217
}
190
218
191
219
/* 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){
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
195
223
int ret;
196
224
server *new_server = malloc(sizeof(server));
197
225
if(new_server == NULL){
198
226
perror_plus("malloc");
199
return -1;
227
return false;
200
228
}
201
229
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
230
.port = port,
231
.if_index = if_index,
232
.af = af };
205
233
if(new_server->ip == NULL){
206
234
perror_plus("strdup");
207
return -1;
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
208
241
}
209
242
/* Special case of first server */
210
if (mc.current_server == NULL){
243
if(*current_server == NULL){
211
244
new_server->next = new_server;
212
245
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
246
*current_server = new_server;
215
247
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
218
251
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;
252
(*current_server)->prev = new_server;
253
}
254
return true;
227
255
}
228
256
229
257
/*
230
258
* Initialize GPGME.
231
259
*/
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
234
265
gpgme_error_t rc;
235
266
gpgme_engine_info_t engine_info;
236
267
237
238
268
/*
239
269
* Helper function to insert pub and seckey to the engine keyring.
240
270
*/
241
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
242
272
int ret;
243
273
int fd;
244
274
gpgme_data_t pgp_data;
251
281
252
282
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
283
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));
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
256
286
return false;
257
287
}
258
288
259
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
260
290
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
263
293
return false;
264
294
}
265
295
272
302
}
273
303
274
304
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
305
fprintf_plus(stderr, "Initializing GPGME\n");
276
306
}
277
307
278
308
/* Init GPGME */
279
309
gpgme_check_version(NULL);
280
310
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
311
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
284
314
return false;
285
315
}
286
316
287
317
/* Set GPGME home directory for the OpenPGP engine only */
288
318
rc = gpgme_get_engine_info(&engine_info);
289
319
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
292
322
return false;
293
323
}
294
324
while(engine_info != NULL){
300
330
engine_info = engine_info->next;
301
331
}
302
332
if(engine_info == NULL){
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
304
335
return false;
305
336
}
306
337
307
338
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
309
340
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
312
344
return false;
313
345
}
314
346
323
355
* Decrypt OpenPGP data.
324
356
* Returns -1 on error
325
357
*/
358
__attribute__((nonnull, warn_unused_result))
326
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
360
size_t crypto_size,
328
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
329
363
gpgme_data_t dh_crypto, dh_plain;
330
364
gpgme_error_t rc;
331
365
ssize_t ret;
333
367
ssize_t plaintext_length = 0;
334
368
335
369
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
371
}
338
372
339
373
/* Create new GPGME data buffer from memory cryptotext */
340
374
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
375
0);
342
376
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));
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
345
379
return -1;
346
380
}
347
381
348
382
/* Create new empty GPGME data buffer for the plaintext */
349
383
rc = gpgme_data_new(&dh_plain);
350
384
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
353
388
gpgme_data_release(dh_crypto);
354
389
return -1;
355
390
}
356
391
357
392
/* Decrypt data from the cryptotext data buffer to the plaintext
358
393
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
395
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
363
398
plaintext_length = -1;
364
399
if(debug){
365
400
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
367
402
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
404
} 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);
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
374
409
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
411
}
377
412
gpgme_recipient_t recipient;
378
413
recipient = result->recipients;
379
414
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");
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
386
422
recipient = recipient->next;
387
423
}
388
424
}
391
427
}
392
428
393
429
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
395
431
}
396
432
397
433
/* Seek back to the beginning of the GPGME plaintext data buffer */
404
440
*plaintext = NULL;
405
441
while(true){
406
442
plaintext_capacity = incbuffer(plaintext,
407
(size_t)plaintext_length,
408
plaintext_capacity);
443
(size_t)plaintext_length,
444
plaintext_capacity);
409
445
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
446
perror_plus("incbuffer");
447
plaintext_length = -1;
448
goto decrypt_end;
413
449
}
414
450
415
451
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
428
464
}
429
465
430
466
if(debug){
431
fprintf(stderr, "Decrypted password is: ");
467
fprintf_plus(stderr, "Decrypted password is: ");
432
468
for(ssize_t i = 0; i < plaintext_length; i++){
433
469
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
434
470
}
445
481
return plaintext_length;
446
482
}
447
483
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
451
487
if(ret == NULL)
452
488
ret = "(unknown)";
453
489
return ret;
454
490
}
455
491
456
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
457
494
static void debuggnutls(__attribute__((unused)) int level,
458
495
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
496
fprintf_plus(stderr, "GnuTLS: %s", string);
460
497
}
461
498
499
__attribute__((nonnull, warn_unused_result))
462
500
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
464
503
int ret;
465
504
466
505
if(debug){
467
fprintf(stderr, "Initializing GnuTLS\n");
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
468
507
}
469
508
470
509
ret = gnutls_global_init();
471
510
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
474
513
return -1;
475
514
}
476
515
483
522
}
484
523
485
524
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
526
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
490
529
gnutls_global_deinit();
491
530
return -1;
492
531
}
493
532
494
533
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
498
538
}
499
539
500
540
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
502
542
GNUTLS_OPENPGP_FMT_BASE64);
503
543
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));
544
fprintf_plus(stderr,
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
509
549
goto globalfail;
510
550
}
511
551
512
552
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
514
554
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
517
558
goto globalfail;
518
559
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
520
561
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
523
564
goto globalfail;
524
565
}
525
566
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
527
568
528
569
return 0;
529
570
530
571
globalfail:
531
572
532
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
533
574
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
535
576
return -1;
536
577
}
537
578
538
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
539
582
int ret;
540
583
/* GnuTLS session creation */
541
584
do {
545
588
}
546
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
590
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
550
594
}
551
595
552
596
{
553
597
const char *err;
554
598
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
556
600
if(quit_now){
557
601
gnutls_deinit(*session);
558
602
return -1;
559
603
}
560
604
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
605
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));
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
565
609
gnutls_deinit(*session);
566
610
return -1;
567
611
}
569
613
570
614
do {
571
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
616
mc->cred);
573
617
if(quit_now){
574
618
gnutls_deinit(*session);
575
619
return -1;
576
620
}
577
621
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
622
if(ret != GNUTLS_E_SUCCESS){
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
581
625
gnutls_deinit(*session);
582
626
return -1;
583
627
}
585
629
/* ignore client certificate if any. */
586
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
587
631
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
589
633
590
634
return 0;
591
635
}
595
639
__attribute__((unused)) const char *txt){}
596
640
597
641
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
599
644
AvahiIfIndex if_index,
600
int af){
645
int af, mandos_context *mc){
601
646
int ret, tcp_sd = -1;
602
647
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
648
struct sockaddr_storage to;
607
649
char *buffer = NULL;
608
650
char *decrypted_buffer = NULL;
609
651
size_t buffer_length = 0;
628
670
pf = PF_INET;
629
671
break;
630
672
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
632
674
errno = EINVAL;
633
675
return -1;
634
676
}
635
677
636
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
637
711
if(ret != 0){
638
712
return -1;
639
713
}
640
714
641
715
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
644
718
}
645
719
646
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
658
732
659
733
memset(&to, 0, sizeof(to));
660
734
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
663
737
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
666
740
}
667
741
if(ret < 0 ){
668
742
int e = errno;
672
746
}
673
747
if(ret == 0){
674
748
int e = errno;
675
fprintf(stderr, "Bad address: %s\n", ip);
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
676
750
errno = e;
677
751
goto mandos_end;
678
752
}
679
753
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*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
687
757
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
690
760
errno = EINVAL;
691
761
goto mandos_end;
692
762
}
693
763
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
695
765
}
696
766
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
700
768
}
701
769
702
770
if(quit_now){
710
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
779
perror_plus("if_indextoname");
712
780
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
715
783
}
716
784
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
719
787
}
720
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
790
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
726
795
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
729
800
}
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
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
736
807
}
737
808
}
738
809
742
813
}
743
814
744
815
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
746
818
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
748
821
}
749
822
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
824
int e = errno;
752
825
perror_plus("connect");
753
826
errno = e;
765
838
while(true){
766
839
size_t out_size = strlen(out);
767
840
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
out_size - written));
841
out_size - written));
769
842
if(ret == -1){
770
843
int e = errno;
771
844
perror_plus("write");
791
864
}
792
865
793
866
if(debug){
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
795
868
}
796
869
797
870
if(quit_now){
799
872
goto mandos_end;
800
873
}
801
874
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
804
880
805
881
if(quit_now){
806
882
errno = EINTR;
817
893
818
894
if(ret != GNUTLS_E_SUCCESS){
819
895
if(debug){
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
821
897
gnutls_perror(ret);
822
898
}
823
899
errno = EPROTO;
827
903
/* Read OpenPGP packet that contains the wanted password */
828
904
829
905
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
832
908
}
833
909
834
910
while(true){
839
915
}
840
916
841
917
buffer_capacity = incbuffer(&buffer, buffer_length,
842
buffer_capacity);
918
buffer_capacity);
843
919
if(buffer_capacity == 0){
844
920
int e = errno;
845
921
perror_plus("incbuffer");
872
948
}
873
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
950
if(ret < 0){
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
876
953
gnutls_perror(ret);
877
954
errno = EPROTO;
878
955
goto mandos_end;
879
956
}
880
957
break;
881
958
default:
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
884
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
962
errno = EIO;
886
963
goto mandos_end;
891
968
}
892
969
893
970
if(debug){
894
fprintf(stderr, "Closing TLS session\n");
971
fprintf_plus(stderr, "Closing TLS session\n");
895
972
}
896
973
897
974
if(quit_now){
909
986
910
987
if(buffer_length > 0){
911
988
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
915
991
if(decrypted_buffer_size >= 0){
916
992
917
993
written = 0;
927
1003
if(ret == 0 and ferror(stdout)){
928
1004
int e = errno;
929
1005
if(debug){
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
932
1008
}
933
1009
errno = e;
934
1010
goto mandos_end;
965
1041
return retval;
966
1042
}
967
1043
1044
__attribute__((nonnull))
968
1045
static void resolve_callback(AvahiSServiceResolver *r,
969
1046
AvahiIfIndex interface,
970
1047
AvahiProtocol proto,
978
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
1057
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
983
1062
984
1063
/* Called whenever a service has been resolved successfully or
985
1064
timed out */
991
1070
switch(event){
992
1071
default:
993
1072
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)));
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
997
1078
break;
998
1079
999
1080
case AVAHI_RESOLVER_FOUND:
1001
1082
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1083
avahi_address_snprint(ip, sizeof(ip), address);
1003
1084
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);
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
1007
1088
}
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1010
1093
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1012
1095
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
1015
1102
}
1016
1103
}
1017
1104
}
1027
1114
const char *domain,
1028
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1116
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1032
1121
1033
1122
/* Called whenever a new services becomes available on the LAN or
1034
1123
is removed from the LAN */
1041
1130
default:
1042
1131
case AVAHI_BROWSER_FAILURE:
1043
1132
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1047
1137
return;
1048
1138
1049
1139
case AVAHI_BROWSER_NEW:
1052
1142
the callback function is called the Avahi server will free the
1053
1143
resolver for us. */
1054
1144
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)));
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1060
1153
break;
1061
1154
1062
1155
case AVAHI_BROWSER_REMOVE:
1065
1158
case AVAHI_BROWSER_ALL_FOR_NOW:
1066
1159
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1067
1160
if(debug){
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
1069
1163
}
1070
1164
break;
1071
1165
}
1080
1174
signal_received = sig;
1081
1175
int old_errno = errno;
1082
1176
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1085
1179
}
1086
1180
errno = old_errno;
1087
1181
}
1088
1182
1183
__attribute__((nonnull, warn_unused_result))
1089
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
1185
int ret;
1186
error_t ret_errno;
1091
1187
1092
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
1189
if(s < 0){
1190
ret_errno = errno;
1094
1191
perror_plus("socket");
1192
errno = ret_errno;
1095
1193
return false;
1096
1194
}
1097
1195
strcpy(ifr->ifr_name, ifname);
1098
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
1197
if(ret == -1){
1100
1198
if(debug){
1199
ret_errno = errno;
1101
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1102
1202
}
1103
1203
return false;
1104
1204
}
1105
1205
return true;
1106
1206
}
1107
1207
1208
__attribute__((nonnull, warn_unused_result))
1108
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1210
1110
1211
/* Reject the loopback device */
1111
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
1213
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1115
1216
}
1116
1217
return false;
1117
1218
}
1118
1219
/* Accept point-to-point devices only if connect_to is specified */
1119
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
1221
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1123
1224
}
1124
1225
return true;
1125
1226
}
1126
1227
/* Otherwise, reject non-broadcast-capable devices */
1127
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
1229
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1131
1232
}
1132
1233
return false;
1133
1234
}
1134
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1236
if(ifr->ifr_flags & IFF_NOARP){
1136
1237
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1138
1240
}
1139
1241
return false;
1140
1242
}
1141
1243
1142
1244
/* Accept this device */
1143
1245
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1145
1247
}
1146
1248
return true;
1147
1249
}
1151
1253
* corresponds to an acceptable network device.
1152
1254
* (This function is passed to scandir(3) as a filter function.)
1153
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1154
1257
int good_interface(const struct dirent *if_entry){
1155
1258
if(if_entry->d_name[0] == '.'){
1156
1259
return 0;
1159
1262
struct ifreq ifr;
1160
1263
if(not get_flags(if_entry->d_name, &ifr)){
1161
1264
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
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1217
1312
int notdotentries(const struct dirent *direntry){
1218
1313
/* Skip "." and ".." */
1219
1314
if(direntry->d_name[0] == '.'
1226
1321
}
1227
1322
1228
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1229
1325
int runnable_hook(const struct dirent *direntry){
1230
1326
int ret;
1327
size_t sret;
1231
1328
struct stat st;
1232
1329
1233
1330
if((direntry->d_name)[0] == '\0'){
1235
1332
return 0;
1236
1333
}
1237
1334
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);
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1337
"0123456789"
1338
"_-");
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1341
if(debug){
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1344
}
1345
return 0;
1346
}
1347
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1255
1356
if(ret == -1){
1256
1357
if(debug){
1257
perror_plus("Could not stat plugin");
1358
perror_plus("Could not stat hook");
1258
1359
}
1259
1360
return 0;
1260
1361
}
1261
1362
if(not (S_ISREG(st.st_mode))){
1262
1363
/* Not a regular file */
1364
if(debug){
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1366
direntry->d_name);
1367
}
1263
1368
return 0;
1264
1369
}
1265
1370
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
1371
/* Not executable */
1372
if(debug){
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1374
direntry->d_name);
1375
}
1267
1376
return 0;
1268
1377
}
1378
if(debug){
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
direntry->d_name);
1381
}
1269
1382
return 1;
1270
1383
}
1271
1384
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1273
1388
int ret;
1274
1389
struct timespec now;
1275
1390
struct timespec waited_time;
1276
1391
intmax_t block_time;
1277
1392
1278
1393
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1394
if(mc->current_server == NULL){
1395
if(debug){
1396
fprintf_plus(stderr, "Wait until first server is found."
1397
" No timeout!\n");
1283
1398
}
1284
1399
ret = avahi_simple_poll_iterate(s, -1);
1285
1400
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1401
if(debug){
1402
fprintf_plus(stderr, "Check current_server if we should run"
1403
" it, or wait\n");
1289
1404
}
1290
1405
/* the current time */
1291
1406
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1296
1411
/* Calculating in ms how long time between now and server
1297
1412
who we visted longest time ago. Now - last seen. */
1298
1413
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1414
- mc->current_server->last_seen.tv_sec);
1300
1415
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1416
- mc->current_server->last_seen.tv_nsec);
1302
1417
/* total time is 10s/10,000ms.
1303
1418
Converting to s from ms by dividing by 1,000,
1304
1419
and ns to ms by dividing by 1,000,000. */
1306
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1307
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1423
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1424
if(debug){
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
block_time);
1311
1427
}
1312
1428
1313
1429
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);
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1318
1434
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1320
1436
return 0;
1321
1437
}
1322
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1439
&mc->current_server->last_seen);
1324
1440
if(ret == -1){
1325
1441
perror_plus("clock_gettime");
1326
1442
return -1;
1327
1443
}
1328
mc.current_server = mc.current_server->next;
1444
mc->current_server = mc->current_server->next;
1329
1445
block_time = 0; /* Call avahi to find new Mandos
1330
1446
servers, but don't block */
1331
1447
}
1333
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
1450
}
1335
1451
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1452
if(ret > 0 or errno != EINTR){
1337
1453
return (ret != 1) ? ret : 0;
1338
1454
}
1339
1455
}
1340
1456
}
1341
1457
}
1342
1458
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1517
const float delay){
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
1521
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
1539
perror_plus("asprintf");
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
1615
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1627
} else {
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
#ifdef __linux__
1723
int ret_linux;
1724
if(ret_errno == 0){
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1730
} else {
1731
restore_loglevel = true;
1732
}
1733
}
1734
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
ret_linux = klogctl(7, NULL, 0);
1740
if(ret_linux == -1){
1741
perror_plus("klogctl");
1742
}
1743
}
1744
#endif /* __linux__ */
1745
1746
/* If raise_privileges() succeeded above */
1747
if(ret_errno == 0){
1748
/* Lower privileges */
1749
ret_errno = lower_privileges();
1750
if(ret_errno != 0){
1751
errno = ret_errno;
1752
perror_plus("Failed to lower privileges");
1753
}
1754
}
1755
1756
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1758
if(ret == -1){
1759
perror_plus("close");
1760
}
1761
1762
if(ret_setflags == -1){
1763
errno = ioctl_errno;
1764
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1765
errno = old_errno;
1766
return ioctl_errno;
1767
}
1768
} else if(debug){
1769
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1770
interface);
1771
}
1772
1773
/* Sleep checking until interface is running.
1774
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
1776
if(interface_is_running(interface)){
1777
break;
1778
}
1779
struct timespec sleeptime = { .tv_nsec = 250000000 };
1780
ret = nanosleep(&sleeptime, NULL);
1781
if(ret == -1 and errno != EINTR){
1782
perror_plus("nanosleep");
1783
}
1784
}
1785
1786
errno = old_errno;
1787
return 0;
1788
}
1789
1790
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
1793
struct ifreq network;
1794
unsigned int if_index = if_nametoindex(interface);
1795
if(if_index == 0){
1796
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1797
errno = old_errno;
1798
return ENXIO;
1799
}
1800
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
if(not get_flags(interface, &network) and debug){
1803
ret_errno = errno;
1804
fprintf_plus(stderr, "Failed to get flags for interface "
1805
"\"%s\"\n", interface);
1806
errno = old_errno;
1807
return ret_errno;
1808
}
1809
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1810
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
if(sd == -1){
1813
ret_errno = errno;
1814
perror_plus("socket");
1815
errno = old_errno;
1816
return ret_errno;
1817
}
1818
1819
if(debug){
1820
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1821
interface);
1822
}
1823
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1826
if(ret_errno != 0){
1827
perror_plus("Failed to raise privileges");
1828
}
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1831
1832
/* If raise_privileges() succeeded above */
1833
if(ret_errno == 0){
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1836
if(ret_errno != 0){
1837
errno = ret_errno;
1838
perror_plus("Failed to lower privileges");
1839
}
1840
}
1841
1842
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1844
if(ret == -1){
1845
perror_plus("close");
1846
}
1847
1848
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1851
errno = old_errno;
1852
return ioctl_errno;
1853
}
1854
} else if(debug){
1855
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1856
interface);
1857
}
1858
1859
errno = old_errno;
1860
return 0;
1861
}
1862
1343
1863
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
1344
1868
AvahiSServiceBrowser *sb = NULL;
1345
int error;
1869
error_t ret_errno;
1346
1870
int ret;
1347
1871
intmax_t tmpmax;
1348
1872
char *tmp;
1349
1873
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;
1874
char *interfaces_to_take_down = NULL;
1875
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
1358
1879
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1359
1880
const char *seckey = PATHDIR "/" SECKEY;
1360
1881
const char *pubkey = PATHDIR "/" PUBKEY;
1882
char *interfaces_hooks = NULL;
1361
1883
1362
1884
bool gnutls_initialized = false;
1363
1885
bool gpgme_initialized = false;
1425
1947
.group = 2 },
1426
1948
{ .name = "retry", .key = 132,
1427
1949
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
1950
.doc = "Retry interval used when denied by the Mandos server",
1951
.group = 2 },
1952
{ .name = "network-hook-dir", .key = 133,
1953
.arg = "DIR",
1954
.doc = "Directory where network hooks are located",
1429
1955
.group = 2 },
1430
1956
/*
1431
1957
* These reproduce what we would get without ARGP_NO_HELP
1450
1976
connect_to = arg;
1451
1977
break;
1452
1978
case 'i': /* --interface */
1453
interface = arg;
1979
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1980
arg, (int)',');
1981
if(ret_errno != 0){
1982
argp_error(state, "%s", strerror(ret_errno));
1983
}
1454
1984
break;
1455
1985
case 's': /* --seckey */
1456
1986
seckey = arg;
1485
2015
argp_error(state, "Bad retry interval");
1486
2016
}
1487
2017
break;
2018
case 133: /* --network-hook-dir */
2019
hookdir = arg;
2020
break;
1488
2021
/*
1489
2022
* These reproduce what we would get without ARGP_NO_HELP
1490
2023
*/
1496
2029
argp_state_help(state, state->out_stream,
1497
2030
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
2031
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
2032
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1500
2033
exit(argp_err_exit_status);
1501
2034
break;
1502
2035
default:
1529
2062
{
1530
2063
/* Work around Debian bug #633582:
1531
2064
<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){
2065
2066
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2070
perror_plus("Failed to raise privileges");
2071
} else {
2072
struct stat st;
2073
2074
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2075
int seckey_fd = open(seckey, O_RDONLY);
2076
if(seckey_fd == -1){
2077
perror_plus("open");
2078
} else {
2079
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2080
if(ret == -1){
2081
perror_plus("fstat");
2082
} else {
2083
if(S_ISREG(st.st_mode)
2084
and st.st_uid == 0 and st.st_gid == 0){
2085
ret = fchown(seckey_fd, uid, gid);
2086
if(ret == -1){
2087
perror_plus("fchown");
2088
}
2089
}
2090
}
2091
TEMP_FAILURE_RETRY(close(seckey_fd));
2092
}
2093
}
2094
2095
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2096
int pubkey_fd = open(pubkey, O_RDONLY);
2097
if(pubkey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(pubkey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(pubkey_fd));
2113
}
2114
}
2115
2116
/* Lower privileges */
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2120
perror_plus("Failed to lower privileges");
2121
}
2122
}
2123
}
2124
2125
/* Remove invalid interface names (except "none") */
2126
{
2127
char *interface = NULL;
2128
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2129
interface))){
2130
if(strcmp(interface, "none") != 0
2131
and if_nametoindex(interface) == 0){
2132
if(interface[0] != '\0'){
2133
fprintf_plus(stderr, "Not using nonexisting interface"
2134
" \"%s\"\n", interface);
2135
}
2136
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2137
interface = NULL;
2138
}
2139
}
2140
}
2141
2142
/* Run network hooks */
2143
{
2144
if(mc.interfaces != NULL){
2145
interfaces_hooks = malloc(mc.interfaces_size);
2146
if(interfaces_hooks == NULL){
2147
perror_plus("malloc");
1644
2148
goto end;
1645
2149
}
2150
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1646
2152
}
1647
close(devnull);
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
1648
2155
}
1649
2156
1650
2157
if(not debug){
1651
2158
avahi_set_log_function(empty_log);
1652
2159
}
1653
2160
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
2161
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1687
2162
from the signal handler */
1688
2163
/* Initialize the pseudo-RNG for Avahi */
1689
2164
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");
2165
simple_poll = avahi_simple_poll_new();
2166
if(simple_poll == NULL){
2167
fprintf_plus(stderr,
2168
"Avahi: Failed to create simple poll object.\n");
1693
2169
exitcode = EX_UNAVAILABLE;
1694
2170
goto end;
1695
2171
}
1757
2233
}
1758
2234
}
1759
2235
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");
2236
/* If no interfaces were specified, make a list */
2237
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2239
/* Look for any good interfaces */
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2241
alphasort);
2242
if(ret >= 1){
2243
/* Add all found interfaces to interfaces list */
2244
for(int i = 0; i < ret; ++i){
2245
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2246
direntries[i]->d_name);
2247
if(ret_errno != 0){
2248
errno = ret_errno;
2249
perror_plus("argz_add");
2250
continue;
2251
}
2252
if(debug){
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
direntries[i]->d_name);
2255
}
2256
}
2257
free(direntries);
2258
} else {
2259
free(direntries);
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2261
exitcode = EXIT_FAILURE;
2262
goto end;
2263
}
2264
}
2265
2266
/* Bring up interfaces which are down, and remove any "none"s */
2267
{
2268
char *interface = NULL;
2269
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2270
interface))){
2271
/* If interface name is "none", stop bringing up interfaces.
2272
Also remove all instances of "none" from the list */
2273
if(strcmp(interface, "none") == 0){
2274
argz_delete(&mc.interfaces, &mc.interfaces_size,
2275
interface);
2276
interface = NULL;
2277
while((interface = argz_next(mc.interfaces,
2278
mc.interfaces_size, interface))){
2279
if(strcmp(interface, "none") == 0){
2280
argz_delete(&mc.interfaces, &mc.interfaces_size,
2281
interface);
2282
interface = NULL;
1845
2283
}
1846
2284
}
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
2285
break;
1865
2286
}
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
}
2287
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2289
if(not interface_was_up){
2290
if(errno != 0){
2291
perror_plus("Failed to bring up interface");
2292
} else {
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2295
interface);
2296
if(errno != 0){
2297
perror_plus("argz_add");
2298
}
2299
}
2300
}
2301
}
2302
if(debug and (interfaces_to_take_down == NULL)){
2303
fprintf_plus(stderr, "No interfaces were brought up\n");
2304
}
2305
}
2306
2307
/* If we only got one interface, explicitly use only that one */
2308
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2309
if(debug){
2310
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2311
mc.interfaces);
2312
}
2313
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1903
2314
}
1904
2315
1905
2316
if(quit_now){
1906
2317
goto end;
1907
2318
}
1908
2319
1909
ret = init_gnutls_global(pubkey, seckey);
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
1910
2321
if(ret == -1){
1911
fprintf(stderr, "init_gnutls_global failed\n");
2322
fprintf_plus(stderr, "init_gnutls_global failed\n");
1912
2323
exitcode = EX_UNAVAILABLE;
1913
2324
goto end;
1914
2325
} else {
1919
2330
goto end;
1920
2331
}
1921
2332
1922
if(mkdtemp(tempdir) == NULL){
2333
/* Try /run/tmp before /tmp */
2334
tempdir = mkdtemp(run_tempdir);
2335
if(tempdir == NULL and errno == ENOENT){
2336
if(debug){
2337
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2338
run_tempdir, old_tempdir);
2339
}
2340
tempdir = mkdtemp(old_tempdir);
2341
}
2342
if(tempdir == NULL){
1923
2343
perror_plus("mkdtemp");
1924
2344
goto end;
1925
2345
}
1926
tempdir_created = true;
1927
2346
1928
2347
if(quit_now){
1929
2348
goto end;
1930
2349
}
1931
2350
1932
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
fprintf(stderr, "init_gpgme failed\n");
2351
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2352
fprintf_plus(stderr, "init_gpgme failed\n");
1934
2353
exitcode = EX_UNAVAILABLE;
1935
2354
goto end;
1936
2355
} else {
1945
2364
/* Connect directly, do not use Zeroconf */
1946
2365
/* (Mainly meant for debugging) */
1947
2366
char *address = strrchr(connect_to, ':');
2367
1948
2368
if(address == NULL){
1949
fprintf(stderr, "No colon in address\n");
2369
fprintf_plus(stderr, "No colon in address\n");
1950
2370
exitcode = EX_USAGE;
1951
2371
goto end;
1952
2372
}
1955
2375
goto end;
1956
2376
}
1957
2377
1958
uint16_t port;
2378
in_port_t port;
1959
2379
errno = 0;
1960
2380
tmpmax = strtoimax(address+1, &tmp, 10);
1961
2381
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1962
or tmpmax != (uint16_t)tmpmax){
1963
fprintf(stderr, "Bad port number\n");
2382
or tmpmax != (in_port_t)tmpmax){
2383
fprintf_plus(stderr, "Bad port number\n");
1964
2384
exitcode = EX_USAGE;
1965
2385
goto end;
1966
2386
}
1967
2387
1968
2388
if(quit_now){
1969
2389
goto end;
1970
2390
}
1971
2391
1972
port = (uint16_t)tmpmax;
2392
port = (in_port_t)tmpmax;
1973
2393
*address = '\0';
1974
2394
/* Colon in address indicates IPv6 */
1975
2395
int af;
1991
2411
}
1992
2412
1993
2413
while(not quit_now){
1994
ret = start_mandos_communication(address, port, if_index, af);
2414
ret = start_mandos_communication(address, port, if_index, af,
2415
&mc);
1995
2416
if(quit_now or ret == 0){
1996
2417
break;
1997
2418
}
1998
2419
if(debug){
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2420
fprintf_plus(stderr, "Retrying in %d seconds\n",
2421
(int)retry_interval);
2001
2422
}
2002
sleep((int)retry_interval);
2423
sleep((unsigned int)retry_interval);
2003
2424
}
2004
2425
2005
if (not quit_now){
2426
if(not quit_now){
2006
2427
exitcode = EXIT_SUCCESS;
2007
2428
}
2008
2429
2023
2444
config.publish_domain = 0;
2024
2445
2025
2446
/* Allocate a new server */
2026
mc.server = avahi_server_new(avahi_simple_poll_get
2027
(mc.simple_poll), &config, NULL,
2028
NULL, &error);
2447
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2448
&config, NULL, NULL, &ret_errno);
2029
2449
2030
2450
/* Free the Avahi configuration data */
2031
2451
avahi_server_config_free(&config);
2033
2453
2034
2454
/* Check if creating the Avahi server object succeeded */
2035
2455
if(mc.server == NULL){
2036
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
avahi_strerror(error));
2456
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2457
avahi_strerror(ret_errno));
2038
2458
exitcode = EX_UNAVAILABLE;
2039
2459
goto end;
2040
2460
}
2046
2466
/* Create the Avahi service browser */
2047
2467
sb = avahi_s_service_browser_new(mc.server, if_index,
2048
2468
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2049
NULL, 0, browse_callback, NULL);
2469
NULL, 0, browse_callback,
2470
(void *)&mc);
2050
2471
if(sb == NULL){
2051
fprintf(stderr, "Failed to create service browser: %s\n",
2052
avahi_strerror(avahi_server_errno(mc.server)));
2472
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2473
avahi_strerror(avahi_server_errno(mc.server)));
2053
2474
exitcode = EX_UNAVAILABLE;
2054
2475
goto end;
2055
2476
}
2061
2482
/* Run the main loop */
2062
2483
2063
2484
if(debug){
2064
fprintf(stderr, "Starting Avahi loop search\n");
2485
fprintf_plus(stderr, "Starting Avahi loop search\n");
2065
2486
}
2066
2487
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2488
ret = avahi_loop_with_timeout(simple_poll,
2489
(int)(retry_interval * 1000), &mc);
2069
2490
if(debug){
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2491
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2492
(ret == 0) ? "successfully" : "with error");
2072
2493
}
2073
2494
2074
2495
end:
2075
2496
2076
2497
if(debug){
2077
fprintf(stderr, "%s exiting\n", argv[0]);
2498
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2078
2499
}
2079
2500
2080
2501
/* Cleanup things */
2502
free(mc.interfaces);
2503
2081
2504
if(sb != NULL)
2082
2505
avahi_s_service_browser_free(sb);
2083
2506
2084
2507
if(mc.server != NULL)
2085
2508
avahi_server_free(mc.server);
2086
2509
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
2510
if(simple_poll != NULL)
2511
avahi_simple_poll_free(simple_poll);
2089
2512
2090
2513
if(gnutls_initialized){
2091
2514
gnutls_certificate_free_credentials(mc.cred);
2096
2519
if(gpgme_initialized){
2097
2520
gpgme_release(mc.ctx);
2098
2521
}
2099
2522
2100
2523
/* Cleans up the circular linked list of Mandos servers the client
2101
2524
has seen */
2102
2525
if(mc.current_server != NULL){
2108
2531
}
2109
2532
}
2110
2533
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");
2534
/* Re-raise privileges */
2535
{
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
2538
perror_plus("Failed to raise privileges");
2539
} else {
2540
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2544
2545
/* Take down the network interfaces which were brought up */
2546
{
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
2554
perror_plus("Failed to take down interface");
2555
}
2556
}
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2559
" down\n");
2560
}
2561
}
2120
2562
}
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
}
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
2565
perror_plus("Failed to lower privileges permanently");
2142
2566
}
2143
2567
}
2144
2568
2569
free(interfaces_to_take_down);
2570
free(interfaces_hooks);
2571
2145
2572
/* Removes the GPGME temp directory and all files inside */
2146
if(tempdir_created){
2573
if(tempdir != NULL){
2147
2574
struct dirent **direntries = NULL;
2148
2575
struct dirent *direntry = NULL;
2149
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2150
2577
alphasort);
2151
if (numentries > 0){
2578
if(numentries > 0){
2152
2579
for(int i = 0; i < numentries; i++){
2153
2580
direntry = direntries[i];
2154
2581
char *fullname = NULL;
2160
2587
}
2161
2588
ret = remove(fullname);
2162
2589
if(ret == -1){
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2164
strerror(errno));
2590
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2591
strerror(errno));
2165
2592
}
2166
2593
free(fullname);
2167
2594
}
2169
2596
2170
2597
/* need to clean even if 0 because man page doesn't specify */
2171
2598
free(direntries);
2172
if (numentries == -1){
2599
if(numentries == -1){
2173
2600
perror_plus("scandir");
2174
2601
}
2175
2602
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0