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- Committer: teddy at bsnet
- Date: 2011-11-13 13:55:45 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-20111113135545-hyb59g1q2icwdcte
* plugins.d/mandos-client.c: Some white space fixes.
(runnable_hook): Simplify name rule. More debug messages.
(runnable_hook): Simplify name rule. More debug messages.
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
41
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42
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
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#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() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
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*/
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
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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
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getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
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() */
97
90
98
91
#ifdef __linux__
99
92
#include <sys/klog.h> /* klogctl() */
141
134
static const char sys_class_net[] = "/sys/class/net";
142
135
char *connect_to = NULL;
143
136
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
137
147
138
/* Doubly linked list that need to be circularly linked when used */
148
139
typedef struct server{
149
140
const char *ip;
150
in_port_t port;
141
uint16_t port;
151
142
AvahiIfIndex if_index;
152
143
int af;
153
144
struct timespec last_seen;
157
148
158
149
/* Used for passing in values through the Avahi callback functions */
159
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
160
152
AvahiServer *server;
161
153
gnutls_certificate_credentials_t cred;
162
154
unsigned int dh_bits;
164
156
const char *priority;
165
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gpgme_ctx_t ctx;
166
158
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
159
} mandos_context;
170
160
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
173
166
174
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sig_atomic_t quit_now = 0;
175
168
int signal_received = 0;
176
169
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/* Function to use when printing errors */
178
171
void perror_plus(const char *print_text){
179
int e = errno;
180
172
fprintf(stderr, "Mandos plugin %s: ",
181
173
program_invocation_short_name);
182
errno = e;
183
174
perror(print_text);
184
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}
185
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__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
196
177
/*
197
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
179
* bytes. "buffer_capacity" is how much is currently allocated,
199
180
* "buffer_length" is how much is already used.
200
181
*/
201
__attribute__((nonnull, warn_unused_result))
202
182
size_t incbuffer(char **buffer, size_t buffer_length,
203
183
size_t buffer_capacity){
204
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
211
187
return 0;
212
188
}
213
*buffer = new_buf;
214
189
buffer_capacity += BUFFER_SIZE;
215
190
}
216
191
return buffer_capacity;
217
192
}
218
193
219
194
/* Add server to set of servers to retry periodically */
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
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
223
197
int ret;
224
198
server *new_server = malloc(sizeof(server));
225
199
if(new_server == NULL){
226
200
perror_plus("malloc");
227
return false;
201
return -1;
228
202
}
229
203
*new_server = (server){ .ip = strdup(ip),
230
204
.port = port,
232
206
.af = af };
233
207
if(new_server->ip == NULL){
234
208
perror_plus("strdup");
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;
209
return -1;
241
210
}
242
211
/* Special case of first server */
243
if(*current_server == NULL){
212
if (mc.current_server == NULL){
244
213
new_server->next = new_server;
245
214
new_server->prev = new_server;
246
*current_server = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
247
217
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
251
220
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
255
229
}
256
230
257
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/*
258
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* Initialize GPGME.
259
233
*/
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
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
265
236
gpgme_error_t rc;
266
237
gpgme_engine_info_t engine_info;
267
238
239
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/*
269
241
* Helper function to insert pub and seckey to the engine keyring.
270
242
*/
271
bool import_key(const char * const filename){
243
bool import_key(const char *filename){
272
244
int ret;
273
245
int fd;
274
246
gpgme_data_t pgp_data;
281
253
282
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
283
255
if(rc != GPG_ERR_NO_ERROR){
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
286
259
return false;
287
260
}
288
261
289
rc = gpgme_op_import(mc->ctx, pgp_data);
262
rc = gpgme_op_import(mc.ctx, pgp_data);
290
263
if(rc != GPG_ERR_NO_ERROR){
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
293
267
return false;
294
268
}
295
269
302
276
}
303
277
304
278
if(debug){
305
fprintf_plus(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
306
281
}
307
282
308
283
/* Init GPGME */
309
284
gpgme_check_version(NULL);
310
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
311
286
if(rc != GPG_ERR_NO_ERROR){
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
314
290
return false;
315
291
}
316
292
317
293
/* Set GPGME home directory for the OpenPGP engine only */
318
294
rc = gpgme_get_engine_info(&engine_info);
319
295
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
322
299
return false;
323
300
}
324
301
while(engine_info != NULL){
330
307
engine_info = engine_info->next;
331
308
}
332
309
if(engine_info == NULL){
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
335
312
return false;
336
313
}
337
314
338
315
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
316
rc = gpgme_new(&(mc.ctx));
340
317
if(rc != GPG_ERR_NO_ERROR){
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
344
321
return false;
345
322
}
346
323
355
332
* Decrypt OpenPGP data.
356
333
* Returns -1 on error
357
334
*/
358
__attribute__((nonnull, warn_unused_result))
359
335
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
336
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
337
char **plaintext){
363
338
gpgme_data_t dh_crypto, dh_plain;
364
339
gpgme_error_t rc;
365
340
ssize_t ret;
367
342
ssize_t plaintext_length = 0;
368
343
369
344
if(debug){
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
371
347
}
372
348
373
349
/* Create new GPGME data buffer from memory cryptotext */
374
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
375
351
0);
376
352
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
379
356
return -1;
380
357
}
381
358
382
359
/* Create new empty GPGME data buffer for the plaintext */
383
360
rc = gpgme_data_new(&dh_plain);
384
361
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
388
365
gpgme_data_release(dh_crypto);
389
366
return -1;
390
367
}
391
368
392
369
/* Decrypt data from the cryptotext data buffer to the plaintext
393
370
data buffer */
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
372
if(rc != GPG_ERR_NO_ERROR){
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
398
376
plaintext_length = -1;
399
377
if(debug){
400
378
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
379
result = gpgme_op_decrypt_result(mc.ctx);
402
380
if(result == NULL){
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
404
383
} else {
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);
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
409
390
if(result->file_name != NULL){
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
411
393
}
412
394
gpgme_recipient_t recipient;
413
395
recipient = result->recipients;
414
396
while(recipient != NULL){
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");
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
422
406
recipient = recipient->next;
423
407
}
424
408
}
427
411
}
428
412
429
413
if(debug){
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
431
416
}
432
417
433
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
464
449
}
465
450
466
451
if(debug){
467
fprintf_plus(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
468
454
for(ssize_t i = 0; i < plaintext_length; i++){
469
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
470
456
}
481
467
return plaintext_length;
482
468
}
483
469
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
487
473
if(ret == NULL)
488
474
ret = "(unknown)";
489
475
return ret;
490
476
}
491
477
492
478
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
479
static void debuggnutls(__attribute__((unused)) int level,
495
480
const char* string){
496
fprintf_plus(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
497
482
}
498
483
499
__attribute__((nonnull, warn_unused_result))
500
484
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
485
const char *seckeyfilename){
503
486
int ret;
504
487
505
488
if(debug){
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
507
491
}
508
492
509
493
ret = gnutls_global_init();
510
494
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
513
497
return -1;
514
498
}
515
499
522
506
}
523
507
524
508
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
510
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
529
513
gnutls_global_deinit();
530
514
return -1;
531
515
}
532
516
533
517
if(debug){
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
seckeyfilename);
538
522
}
539
523
540
524
ret = gnutls_certificate_set_openpgp_key_file
541
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
542
526
GNUTLS_OPENPGP_FMT_BASE64);
543
527
if(ret != GNUTLS_E_SUCCESS){
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));
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
549
534
goto globalfail;
550
535
}
551
536
552
537
/* GnuTLS server initialization */
553
ret = gnutls_dh_params_init(&mc->dh_params);
538
ret = gnutls_dh_params_init(&mc.dh_params);
554
539
if(ret != GNUTLS_E_SUCCESS){
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
558
543
goto globalfail;
559
544
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
546
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
564
550
goto globalfail;
565
551
}
566
552
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
554
569
555
return 0;
570
556
571
557
globalfail:
572
558
573
gnutls_certificate_free_credentials(mc->cred);
559
gnutls_certificate_free_credentials(mc.cred);
574
560
gnutls_global_deinit();
575
gnutls_dh_params_deinit(mc->dh_params);
561
gnutls_dh_params_deinit(mc.dh_params);
576
562
return -1;
577
563
}
578
564
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
565
static int init_gnutls_session(gnutls_session_t *session){
582
566
int ret;
583
567
/* GnuTLS session creation */
584
568
do {
588
572
}
589
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
574
if(ret != GNUTLS_E_SUCCESS){
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
594
578
}
595
579
596
580
{
597
581
const char *err;
598
582
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
584
if(quit_now){
601
585
gnutls_deinit(*session);
602
586
return -1;
603
587
}
604
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
605
589
if(ret != GNUTLS_E_SUCCESS){
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
609
594
gnutls_deinit(*session);
610
595
return -1;
611
596
}
613
598
614
599
do {
615
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
601
mc.cred);
617
602
if(quit_now){
618
603
gnutls_deinit(*session);
619
604
return -1;
620
605
}
621
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
622
607
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
625
611
gnutls_deinit(*session);
626
612
return -1;
627
613
}
629
615
/* ignore client certificate if any. */
630
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
617
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
619
634
620
return 0;
635
621
}
639
625
__attribute__((unused)) const char *txt){}
640
626
641
627
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
628
static int start_mandos_communication(const char *ip, uint16_t port,
644
629
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
630
int af){
646
631
int ret, tcp_sd = -1;
647
632
ssize_t sret;
648
struct sockaddr_storage to;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
649
637
char *buffer = NULL;
650
638
char *decrypted_buffer = NULL;
651
639
size_t buffer_length = 0;
670
658
pf = PF_INET;
671
659
break;
672
660
default:
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
674
663
errno = EINVAL;
675
664
return -1;
676
665
}
677
666
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);
667
ret = init_gnutls_session(&session);
711
668
if(ret != 0){
712
669
return -1;
713
670
}
714
671
715
672
if(debug){
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
718
676
}
719
677
720
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
732
690
733
691
memset(&to, 0, sizeof(to));
734
692
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
695
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
740
698
}
741
699
if(ret < 0 ){
742
700
int e = errno;
746
704
}
747
705
if(ret == 0){
748
706
int e = errno;
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
750
709
errno = e;
751
710
goto mandos_end;
752
711
}
753
712
if(af == AF_INET6){
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
757
720
if(if_index == AVAHI_IF_UNSPEC){
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
760
724
errno = EINVAL;
761
725
goto mandos_end;
762
726
}
763
727
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
728
to.in6.sin6_scope_id = (uint32_t)if_index;
765
729
}
766
730
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
768
734
}
769
735
770
736
if(quit_now){
778
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
745
perror_plus("if_indextoname");
780
746
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
783
750
}
784
751
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
787
754
}
788
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
790
758
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
795
761
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
800
764
}
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);
765
if(pcret == NULL){
766
perror_plus("inet_ntop");
767
} else {
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
771
}
807
772
}
808
773
}
809
774
813
778
}
814
779
815
780
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
782
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
784
}
822
785
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
787
int e = errno;
825
788
perror_plus("connect");
826
789
errno = e;
864
827
}
865
828
866
829
if(debug){
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
868
832
}
869
833
870
834
if(quit_now){
872
836
goto mandos_end;
873
837
}
874
838
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);
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
841
881
842
if(quit_now){
882
843
errno = EINTR;
893
854
894
855
if(ret != GNUTLS_E_SUCCESS){
895
856
if(debug){
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
897
859
gnutls_perror(ret);
898
860
}
899
861
errno = EPROTO;
903
865
/* Read OpenPGP packet that contains the wanted password */
904
866
905
867
if(debug){
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
908
870
}
909
871
910
872
while(true){
948
910
}
949
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
950
912
if(ret < 0){
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
953
915
gnutls_perror(ret);
954
916
errno = EPROTO;
955
917
goto mandos_end;
956
918
}
957
919
break;
958
920
default:
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
961
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
962
925
errno = EIO;
963
926
goto mandos_end;
968
931
}
969
932
970
933
if(debug){
971
fprintf_plus(stderr, "Closing TLS session\n");
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
972
936
}
973
937
974
938
if(quit_now){
987
951
if(buffer_length > 0){
988
952
ssize_t decrypted_buffer_size;
989
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
954
&decrypted_buffer);
991
955
if(decrypted_buffer_size >= 0){
992
956
993
957
written = 0;
1003
967
if(ret == 0 and ferror(stdout)){
1004
968
int e = errno;
1005
969
if(debug){
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
1008
973
}
1009
974
errno = e;
1010
975
goto mandos_end;
1041
1006
return retval;
1042
1007
}
1043
1008
1044
__attribute__((nonnull))
1045
1009
static void resolve_callback(AvahiSServiceResolver *r,
1046
1010
AvahiIfIndex interface,
1047
1011
AvahiProtocol proto,
1055
1019
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
1020
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
1021
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1062
1024
1063
1025
/* Called whenever a service has been resolved successfully or
1064
1026
timed out */
1070
1032
switch(event){
1071
1033
default:
1072
1034
case AVAHI_RESOLVER_FAILURE:
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)));
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
avahi_strerror(avahi_server_errno(mc.server)));
1078
1039
break;
1079
1040
1080
1041
case AVAHI_RESOLVER_FOUND:
1082
1043
char ip[AVAHI_ADDRESS_STR_MAX];
1083
1044
avahi_address_snprint(ip, sizeof(ip), address);
1084
1045
if(debug){
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);
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
ip, (intmax_t)interface, port);
1088
1050
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1093
1053
if(ret == 0){
1094
avahi_simple_poll_quit(simple_poll);
1054
avahi_simple_poll_quit(mc.simple_poll);
1095
1055
} else {
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
}
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1102
1058
}
1103
1059
}
1104
1060
}
1114
1070
const char *domain,
1115
1071
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
1072
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1121
1075
1122
1076
/* Called whenever a new services becomes available on the LAN or
1123
1077
is removed from the LAN */
1130
1084
default:
1131
1085
case AVAHI_BROWSER_FAILURE:
1132
1086
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);
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
1089
avahi_strerror(avahi_server_errno(mc.server)));
1090
avahi_simple_poll_quit(mc.simple_poll);
1137
1091
return;
1138
1092
1139
1093
case AVAHI_BROWSER_NEW:
1142
1096
the callback function is called the Avahi server will free the
1143
1097
resolver for us. */
1144
1098
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)));
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
name, type, domain, protocol, 0,
1101
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
1153
1105
break;
1154
1106
1155
1107
case AVAHI_BROWSER_REMOVE:
1158
1110
case AVAHI_BROWSER_ALL_FOR_NOW:
1159
1111
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1160
1112
if(debug){
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1163
1115
}
1164
1116
break;
1165
1117
}
1174
1126
signal_received = sig;
1175
1127
int old_errno = errno;
1176
1128
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1179
1131
}
1180
1132
errno = old_errno;
1181
1133
}
1182
1134
1183
__attribute__((nonnull, warn_unused_result))
1184
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
1136
int ret;
1186
error_t ret_errno;
1187
1137
1188
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
1139
if(s < 0){
1190
ret_errno = errno;
1191
1140
perror_plus("socket");
1192
errno = ret_errno;
1193
1141
return false;
1194
1142
}
1195
1143
strcpy(ifr->ifr_name, ifname);
1196
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
1145
if(ret == -1){
1198
1146
if(debug){
1199
ret_errno = errno;
1200
1147
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
1148
}
1203
1149
return false;
1204
1150
}
1205
1151
return true;
1206
1152
}
1207
1153
1208
__attribute__((nonnull, warn_unused_result))
1209
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1155
1211
1156
/* Reject the loopback device */
1212
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1213
1158
if(debug){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1216
1161
}
1217
1162
return false;
1218
1163
}
1219
1164
/* Accept point-to-point devices only if connect_to is specified */
1220
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1221
1166
if(debug){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1224
1169
}
1225
1170
return true;
1226
1171
}
1227
1172
/* Otherwise, reject non-broadcast-capable devices */
1228
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1229
1174
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1232
1177
}
1233
1178
return false;
1234
1179
}
1235
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
1181
if(ifr->ifr_flags & IFF_NOARP){
1237
1182
if(debug){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1240
1185
}
1241
1186
return false;
1242
1187
}
1243
1188
1244
1189
/* Accept this device */
1245
1190
if(debug){
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1247
1193
}
1248
1194
return true;
1249
1195
}
1253
1199
* corresponds to an acceptable network device.
1254
1200
* (This function is passed to scandir(3) as a filter function.)
1255
1201
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
1202
int good_interface(const struct dirent *if_entry){
1258
1203
if(if_entry->d_name[0] == '.'){
1259
1204
return 0;
1262
1207
struct ifreq ifr;
1263
1208
if(not get_flags(if_entry->d_name, &ifr)){
1264
1209
if(debug){
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))
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1312
1269
int notdotentries(const struct dirent *direntry){
1313
1270
/* Skip "." and ".." */
1314
1271
if(direntry->d_name[0] == '.'
1321
1278
}
1322
1279
1323
1280
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
1281
int runnable_hook(const struct dirent *direntry){
1326
1282
int ret;
1327
1283
size_t sret;
1335
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
1292
"abcdefghijklmnopqrstuvwxyz"
1337
1293
"0123456789"
1338
"_.-");
1294
"_-");
1339
1295
if((direntry->d_name)[sret] != '\0'){
1340
1296
/* Contains non-allowed characters */
1341
1297
if(debug){
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1344
1301
}
1345
1302
return 0;
1346
1303
}
1359
1316
}
1360
1317
return 0;
1361
1318
}
1362
free(fullname);
1363
1319
if(not (S_ISREG(st.st_mode))){
1364
1320
/* Not a regular file */
1365
1321
if(debug){
1366
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1367
direntry->d_name);
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1368
1325
}
1369
1326
return 0;
1370
1327
}
1371
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1372
1329
/* Not executable */
1373
1330
if(debug){
1374
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1375
direntry->d_name);
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1376
1334
}
1377
1335
return 0;
1378
1336
}
1379
if(debug){
1380
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1381
direntry->d_name);
1382
}
1383
1337
return 1;
1384
1338
}
1385
1339
1386
__attribute__((nonnull, warn_unused_result))
1387
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1388
mandos_context *mc){
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1389
1341
int ret;
1390
1342
struct timespec now;
1391
1343
struct timespec waited_time;
1392
1344
intmax_t block_time;
1393
1345
1394
1346
while(true){
1395
if(mc->current_server == NULL){
1396
if(debug){
1397
fprintf_plus(stderr, "Wait until first server is found."
1398
" No timeout!\n");
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1399
1351
}
1400
1352
ret = avahi_simple_poll_iterate(s, -1);
1401
1353
} else {
1402
if(debug){
1403
fprintf_plus(stderr, "Check current_server if we should run"
1404
" it, or wait\n");
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1405
1358
}
1406
1359
/* the current time */
1407
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1412
1365
/* Calculating in ms how long time between now and server
1413
1366
who we visted longest time ago. Now - last seen. */
1414
1367
waited_time.tv_sec = (now.tv_sec
1415
- mc->current_server->last_seen.tv_sec);
1368
- mc.current_server->last_seen.tv_sec);
1416
1369
waited_time.tv_nsec = (now.tv_nsec
1417
- mc->current_server->last_seen.tv_nsec);
1370
- mc.current_server->last_seen.tv_nsec);
1418
1371
/* total time is 10s/10,000ms.
1419
1372
Converting to s from ms by dividing by 1,000,
1420
1373
and ns to ms by dividing by 1,000,000. */
1422
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1423
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1424
1377
1425
if(debug){
1426
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1427
block_time);
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1428
1381
}
1429
1382
1430
1383
if(block_time <= 0){
1431
ret = start_mandos_communication(mc->current_server->ip,
1432
mc->current_server->port,
1433
mc->current_server->if_index,
1434
mc->current_server->af, mc);
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1435
1388
if(ret == 0){
1436
avahi_simple_poll_quit(s);
1389
avahi_simple_poll_quit(mc.simple_poll);
1437
1390
return 0;
1438
1391
}
1439
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1440
&mc->current_server->last_seen);
1393
&mc.current_server->last_seen);
1441
1394
if(ret == -1){
1442
1395
perror_plus("clock_gettime");
1443
1396
return -1;
1444
1397
}
1445
mc->current_server = mc->current_server->next;
1398
mc.current_server = mc.current_server->next;
1446
1399
block_time = 0; /* Call avahi to find new Mandos
1447
1400
servers, but don't block */
1448
1401
}
1450
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1451
1404
}
1452
1405
if(ret != 0){
1453
if(ret > 0 or errno != EINTR){
1406
if (ret > 0 or errno != EINTR){
1454
1407
return (ret != 1) ? ret : 0;
1455
1408
}
1456
1409
}
1457
1410
}
1458
1411
}
1459
1412
1460
/* Set effective uid to 0, return errno */
1461
__attribute__((warn_unused_result))
1462
error_t raise_privileges(void){
1463
error_t old_errno = errno;
1464
error_t ret_errno = 0;
1465
if(seteuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective and real user ID to 0. Return errno. */
1474
__attribute__((warn_unused_result))
1475
error_t raise_privileges_permanently(void){
1476
error_t old_errno = errno;
1477
error_t ret_errno = raise_privileges();
1478
if(ret_errno != 0){
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
if(setuid(0) == -1){
1483
ret_errno = errno;
1484
perror_plus("seteuid");
1485
}
1486
errno = old_errno;
1487
return ret_errno;
1488
}
1489
1490
/* Set effective user ID to unprivileged saved user ID */
1491
__attribute__((warn_unused_result))
1492
error_t lower_privileges(void){
1493
error_t old_errno = errno;
1494
error_t ret_errno = 0;
1495
if(seteuid(uid) == -1){
1496
ret_errno = errno;
1497
perror_plus("seteuid");
1498
}
1499
errno = old_errno;
1500
return ret_errno;
1501
}
1502
1503
/* Lower privileges permanently */
1504
__attribute__((warn_unused_result))
1505
error_t lower_privileges_permanently(void){
1506
error_t old_errno = errno;
1507
error_t ret_errno = 0;
1508
if(setuid(uid) == -1){
1509
ret_errno = errno;
1510
perror_plus("setuid");
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1518
const float delay){
1519
struct dirent **direntries;
1520
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1521
alphasort);
1522
if(numhooks == -1){
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("scandir");
1530
}
1531
} else {
1532
struct dirent *direntry;
1533
int ret;
1534
int devnull = open("/dev/null", O_RDONLY);
1535
for(int i = 0; i < numhooks; i++){
1536
direntry = direntries[i];
1537
char *fullname = NULL;
1538
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1539
if(ret < 0){
1540
perror_plus("asprintf");
1541
continue;
1542
}
1543
if(debug){
1544
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1545
direntry->d_name);
1546
}
1547
pid_t hook_pid = fork();
1548
if(hook_pid == 0){
1549
/* Child */
1550
/* Raise privileges */
1551
if(raise_privileges_permanently() != 0){
1552
perror_plus("Failed to raise privileges");
1553
_exit(EX_NOPERM);
1554
}
1555
/* Set group */
1556
errno = 0;
1557
ret = setgid(0);
1558
if(ret == -1){
1559
perror_plus("setgid");
1560
_exit(EX_NOPERM);
1561
}
1562
/* Reset supplementary groups */
1563
errno = 0;
1564
ret = setgroups(0, NULL);
1565
if(ret == -1){
1566
perror_plus("setgroups");
1567
_exit(EX_NOPERM);
1568
}
1569
ret = dup2(devnull, STDIN_FILENO);
1570
if(ret == -1){
1571
perror_plus("dup2(devnull, STDIN_FILENO)");
1572
_exit(EX_OSERR);
1573
}
1574
ret = close(devnull);
1575
if(ret == -1){
1576
perror_plus("close");
1577
_exit(EX_OSERR);
1578
}
1579
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
if(ret == -1){
1581
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1582
_exit(EX_OSERR);
1583
}
1584
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
if(ret == -1){
1586
perror_plus("setenv");
1587
_exit(EX_OSERR);
1588
}
1589
ret = setenv("DEVICE", interface, 1);
1590
if(ret == -1){
1591
perror_plus("setenv");
1592
_exit(EX_OSERR);
1593
}
1594
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1595
if(ret == -1){
1596
perror_plus("setenv");
1597
_exit(EX_OSERR);
1598
}
1599
ret = setenv("MODE", mode, 1);
1600
if(ret == -1){
1601
perror_plus("setenv");
1602
_exit(EX_OSERR);
1603
}
1604
char *delaystring;
1605
ret = asprintf(&delaystring, "%f", (double)delay);
1606
if(ret == -1){
1607
perror_plus("asprintf");
1608
_exit(EX_OSERR);
1609
}
1610
ret = setenv("DELAY", delaystring, 1);
1611
if(ret == -1){
1612
free(delaystring);
1613
perror_plus("setenv");
1614
_exit(EX_OSERR);
1615
}
1616
free(delaystring);
1617
if(connect_to != NULL){
1618
ret = setenv("CONNECT", connect_to, 1);
1619
if(ret == -1){
1620
perror_plus("setenv");
1621
_exit(EX_OSERR);
1622
}
1623
}
1624
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1625
perror_plus("execl");
1626
_exit(EXIT_FAILURE);
1627
}
1628
} else {
1629
int status;
1630
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1631
perror_plus("waitpid");
1632
free(fullname);
1633
continue;
1634
}
1635
if(WIFEXITED(status)){
1636
if(WEXITSTATUS(status) != 0){
1637
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1638
" with status %d\n", direntry->d_name,
1639
WEXITSTATUS(status));
1640
free(fullname);
1641
continue;
1642
}
1643
} else if(WIFSIGNALED(status)){
1644
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1645
" signal %d\n", direntry->d_name,
1646
WTERMSIG(status));
1647
free(fullname);
1648
continue;
1649
} else {
1650
fprintf_plus(stderr, "Warning: network hook \"%s\""
1651
" crashed\n", direntry->d_name);
1652
free(fullname);
1653
continue;
1654
}
1655
}
1656
free(fullname);
1657
if(debug){
1658
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1659
direntry->d_name);
1660
}
1661
}
1662
close(devnull);
1663
}
1664
}
1665
1666
__attribute__((nonnull, warn_unused_result))
1667
error_t bring_up_interface(const char *const interface,
1668
const float delay){
1669
error_t old_errno = errno;
1670
int ret;
1671
struct ifreq network;
1672
unsigned int if_index = if_nametoindex(interface);
1673
if(if_index == 0){
1674
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1675
errno = old_errno;
1676
return ENXIO;
1677
}
1678
1679
if(quit_now){
1680
errno = old_errno;
1681
return EINTR;
1682
}
1683
1684
if(not interface_is_up(interface)){
1685
error_t ret_errno = 0, ioctl_errno = 0;
1686
if(not get_flags(interface, &network)){
1687
ret_errno = errno;
1688
fprintf_plus(stderr, "Failed to get flags for interface "
1689
"\"%s\"\n", interface);
1690
errno = old_errno;
1691
return ret_errno;
1692
}
1693
network.ifr_flags |= IFF_UP; /* set flag */
1694
1695
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1696
if(sd == -1){
1697
ret_errno = errno;
1698
perror_plus("socket");
1699
errno = old_errno;
1700
return ret_errno;
1701
}
1702
1703
if(quit_now){
1704
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
if(ret == -1){
1706
perror_plus("close");
1707
}
1708
errno = old_errno;
1709
return EINTR;
1710
}
1711
1712
if(debug){
1713
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1714
interface);
1715
}
1716
1717
/* Raise privileges */
1718
ret_errno = raise_privileges();
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
1723
#ifdef __linux__
1724
int ret_linux;
1725
bool restore_loglevel = false;
1726
if(ret_errno == 0){
1727
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1728
messages about the network interface to mess up the prompt */
1729
ret_linux = klogctl(8, NULL, 5);
1730
if(ret_linux == -1){
1731
perror_plus("klogctl");
1732
} else {
1733
restore_loglevel = true;
1734
}
1735
}
1736
#endif /* __linux__ */
1737
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1738
ioctl_errno = errno;
1739
#ifdef __linux__
1740
if(restore_loglevel){
1741
ret_linux = klogctl(7, NULL, 0);
1742
if(ret_linux == -1){
1743
perror_plus("klogctl");
1744
}
1745
}
1746
#endif /* __linux__ */
1747
1748
/* If raise_privileges() succeeded above */
1749
if(ret_errno == 0){
1750
/* Lower privileges */
1751
ret_errno = lower_privileges();
1752
if(ret_errno != 0){
1753
errno = ret_errno;
1754
perror_plus("Failed to lower privileges");
1755
}
1756
}
1757
1758
/* Close the socket */
1759
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1760
if(ret == -1){
1761
perror_plus("close");
1762
}
1763
1764
if(ret_setflags == -1){
1765
errno = ioctl_errno;
1766
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1767
errno = old_errno;
1768
return ioctl_errno;
1769
}
1770
} else if(debug){
1771
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1772
interface);
1773
}
1774
1775
/* Sleep checking until interface is running.
1776
Check every 0.25s, up to total time of delay */
1777
for(int i=0; i < delay * 4; i++){
1778
if(interface_is_running(interface)){
1779
break;
1780
}
1781
struct timespec sleeptime = { .tv_nsec = 250000000 };
1782
ret = nanosleep(&sleeptime, NULL);
1783
if(ret == -1 and errno != EINTR){
1784
perror_plus("nanosleep");
1785
}
1786
}
1787
1788
errno = old_errno;
1789
return 0;
1790
}
1791
1792
__attribute__((nonnull, warn_unused_result))
1793
error_t take_down_interface(const char *const interface){
1794
error_t old_errno = errno;
1795
struct ifreq network;
1796
unsigned int if_index = if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1799
errno = old_errno;
1800
return ENXIO;
1801
}
1802
if(interface_is_up(interface)){
1803
error_t ret_errno = 0, ioctl_errno = 0;
1804
if(not get_flags(interface, &network) and debug){
1805
ret_errno = errno;
1806
fprintf_plus(stderr, "Failed to get flags for interface "
1807
"\"%s\"\n", interface);
1808
errno = old_errno;
1809
return ret_errno;
1810
}
1811
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1812
1813
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1814
if(sd == -1){
1815
ret_errno = errno;
1816
perror_plus("socket");
1817
errno = old_errno;
1818
return ret_errno;
1819
}
1820
1821
if(debug){
1822
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1823
interface);
1824
}
1825
1826
/* Raise privileges */
1827
ret_errno = raise_privileges();
1828
if(ret_errno != 0){
1829
perror_plus("Failed to raise privileges");
1830
}
1831
1832
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1833
ioctl_errno = errno;
1834
1835
/* If raise_privileges() succeeded above */
1836
if(ret_errno == 0){
1837
/* Lower privileges */
1838
ret_errno = lower_privileges();
1839
if(ret_errno != 0){
1840
errno = ret_errno;
1841
perror_plus("Failed to lower privileges");
1842
}
1843
}
1844
1845
/* Close the socket */
1846
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1847
if(ret == -1){
1848
perror_plus("close");
1849
}
1850
1851
if(ret_setflags == -1){
1852
errno = ioctl_errno;
1853
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1854
errno = old_errno;
1855
return ioctl_errno;
1856
}
1857
} else if(debug){
1858
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1859
interface);
1860
}
1861
1862
errno = old_errno;
1863
return 0;
1864
}
1865
1866
1413
int main(int argc, char *argv[]){
1867
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1868
.priority = "SECURE256:!CTYPE-X.509:"
1869
"+CTYPE-OPENPGP", .current_server = NULL,
1870
.interfaces = NULL, .interfaces_size = 0 };
1871
1414
AvahiSServiceBrowser *sb = NULL;
1872
error_t ret_errno;
1415
int error;
1873
1416
int ret;
1874
1417
intmax_t tmpmax;
1875
1418
char *tmp;
1876
1419
int exitcode = EXIT_SUCCESS;
1877
char *interfaces_to_take_down = NULL;
1878
size_t interfaces_to_take_down_size = 0;
1879
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1880
char old_tempdir[] = "/tmp/mandosXXXXXX";
1881
char *tempdir = NULL;
1420
const char *interface = "";
1421
struct ifreq network;
1422
int sd = -1;
1423
bool take_down_interface = false;
1424
uid_t uid;
1425
gid_t gid;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
1882
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1883
1429
const char *seckey = PATHDIR "/" SECKEY;
1884
1430
const char *pubkey = PATHDIR "/" PUBKEY;
1885
char *interfaces_hooks = NULL;
1886
1431
1887
1432
bool gnutls_initialized = false;
1888
1433
bool gpgme_initialized = false;
1950
1495
.group = 2 },
1951
1496
{ .name = "retry", .key = 132,
1952
1497
.arg = "SECONDS",
1953
.doc = "Retry interval used when denied by the Mandos server",
1498
.doc = "Retry interval used when denied by the mandos server",
1954
1499
.group = 2 },
1955
1500
{ .name = "network-hook-dir", .key = 133,
1956
1501
.arg = "DIR",
1979
1524
connect_to = arg;
1980
1525
break;
1981
1526
case 'i': /* --interface */
1982
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1983
arg, (int)',');
1984
if(ret_errno != 0){
1985
argp_error(state, "%s", strerror(ret_errno));
1986
}
1527
interface = arg;
1987
1528
break;
1988
1529
case 's': /* --seckey */
1989
1530
seckey = arg;
2032
1573
argp_state_help(state, state->out_stream,
2033
1574
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2034
1575
case 'V': /* --version */
2035
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
2036
1578
exit(argp_err_exit_status);
2037
1579
break;
2038
1580
default:
2065
1607
{
2066
1608
/* Work around Debian bug #633582:
2067
1609
<http://bugs.debian.org/633582> */
2068
2069
/* Re-raise privileges */
2070
ret_errno = raise_privileges();
2071
if(ret_errno != 0){
2072
errno = ret_errno;
2073
perror_plus("Failed to raise privileges");
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
2074
1675
} else {
2075
struct stat st;
2076
2077
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2078
int seckey_fd = open(seckey, O_RDONLY);
2079
if(seckey_fd == -1){
2080
perror_plus("open");
2081
} else {
2082
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2083
if(ret == -1){
2084
perror_plus("fstat");
2085
} else {
2086
if(S_ISREG(st.st_mode)
2087
and st.st_uid == 0 and st.st_gid == 0){
2088
ret = fchown(seckey_fd, uid, gid);
2089
if(ret == -1){
2090
perror_plus("fchown");
2091
}
2092
}
2093
}
2094
TEMP_FAILURE_RETRY(close(seckey_fd));
2095
}
2096
}
2097
2098
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2099
int pubkey_fd = open(pubkey, O_RDONLY);
2100
if(pubkey_fd == -1){
2101
perror_plus("open");
2102
} else {
2103
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2104
if(ret == -1){
2105
perror_plus("fstat");
2106
} else {
2107
if(S_ISREG(st.st_mode)
2108
and st.st_uid == 0 and st.st_gid == 0){
2109
ret = fchown(pubkey_fd, uid, gid);
2110
if(ret == -1){
2111
perror_plus("fchown");
2112
}
2113
}
2114
}
2115
TEMP_FAILURE_RETRY(close(pubkey_fd));
2116
}
2117
}
2118
2119
/* Lower privileges */
2120
ret_errno = lower_privileges();
2121
if(ret_errno != 0){
2122
errno = ret_errno;
2123
perror_plus("Failed to lower privileges");
2124
}
2125
}
2126
}
2127
2128
/* Remove invalid interface names (except "none") */
2129
{
2130
char *interface = NULL;
2131
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2132
interface))){
2133
if(strcmp(interface, "none") != 0
2134
and if_nametoindex(interface) == 0){
2135
if(interface[0] != '\0'){
2136
fprintf_plus(stderr, "Not using nonexisting interface"
2137
" \"%s\"\n", interface);
2138
}
2139
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2140
interface = NULL;
2141
}
2142
}
2143
}
2144
2145
/* Run network hooks */
2146
{
2147
if(mc.interfaces != NULL){
2148
interfaces_hooks = malloc(mc.interfaces_size);
2149
if(interfaces_hooks == NULL){
2150
perror_plus("malloc");
2151
goto end;
2152
}
2153
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2154
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2155
}
2156
run_network_hooks("start", interfaces_hooks != NULL ?
2157
interfaces_hooks : "", delay);
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
1754
goto end;
1755
}
1756
}
1757
close(devnull);
1758
}
2158
1759
}
2159
1760
2160
1761
if(not debug){
2161
1762
avahi_set_log_function(empty_log);
2162
1763
}
2163
1764
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
2164
1799
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2165
1800
from the signal handler */
2166
1801
/* Initialize the pseudo-RNG for Avahi */
2167
1802
srand((unsigned int) time(NULL));
2168
simple_poll = avahi_simple_poll_new();
2169
if(simple_poll == NULL){
2170
fprintf_plus(stderr,
2171
"Avahi: Failed to create simple poll object.\n");
1803
mc.simple_poll = avahi_simple_poll_new();
1804
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
2172
1807
exitcode = EX_UNAVAILABLE;
2173
1808
goto end;
2174
1809
}
2236
1871
}
2237
1872
}
2238
1873
2239
/* If no interfaces were specified, make a list */
2240
if(mc.interfaces == NULL){
2241
struct dirent **direntries;
2242
/* Look for any good interfaces */
2243
ret = scandir(sys_class_net, &direntries, good_interface,
2244
alphasort);
2245
if(ret >= 1){
2246
/* Add all found interfaces to interfaces list */
2247
for(int i = 0; i < ret; ++i){
2248
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2249
direntries[i]->d_name);
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("argz_add");
2253
continue;
2254
}
2255
if(debug){
2256
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2257
direntries[i]->d_name);
2258
}
2259
}
2260
free(direntries);
1874
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1877
if(if_index == 0){
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1881
goto end;
1882
}
1883
1884
if(quit_now){
1885
goto end;
1886
}
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1895
#ifdef __linux__
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1898
ret = klogctl(8, NULL, 5);
1899
bool restore_loglevel = true;
1900
if(ret == -1){
1901
restore_loglevel = false;
1902
perror_plus("klogctl");
1903
}
1904
#endif /* __linux__ */
1905
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1907
if(sd < 0){
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1910
#ifdef __linux__
1911
if(restore_loglevel){
1912
ret = klogctl(7, NULL, 0);
1913
if(ret == -1){
1914
perror_plus("klogctl");
1915
}
1916
}
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
goto end;
1925
}
1926
strcpy(network.ifr_name, interface);
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1928
if(ret == -1){
1929
perror_plus("ioctl SIOCGIFFLAGS");
1930
#ifdef __linux__
1931
if(restore_loglevel){
1932
ret = klogctl(7, NULL, 0);
1933
if(ret == -1){
1934
perror_plus("klogctl");
1935
}
1936
}
1937
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1945
goto end;
1946
}
1947
if((network.ifr_flags & IFF_UP) == 0){
1948
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1951
if(ret == -1){
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1955
#ifdef __linux__
1956
if(restore_loglevel){
1957
ret = klogctl(7, NULL, 0);
1958
if(ret == -1){
1959
perror_plus("klogctl");
1960
}
1961
}
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1969
goto end;
1970
}
1971
}
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1974
for(int i=0; i < delay * 4; i++){
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1976
if(ret == -1){
1977
perror_plus("ioctl SIOCGIFFLAGS");
1978
} else if(network.ifr_flags & IFF_RUNNING){
1979
break;
1980
}
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
ret = nanosleep(&sleeptime, NULL);
1983
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1985
}
1986
}
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
}
1994
#ifdef __linux__
1995
if(restore_loglevel){
1996
/* Restores kernel loglevel to default */
1997
ret = klogctl(7, NULL, 0);
1998
if(ret == -1){
1999
perror_plus("klogctl");
2000
}
2001
}
2002
#endif /* __linux__ */
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2261
2011
} else {
2262
free(direntries);
2263
fprintf_plus(stderr, "Could not find a network interface\n");
2264
exitcode = EXIT_FAILURE;
2265
goto end;
2266
}
2267
}
2268
2269
/* Bring up interfaces which are down, and remove any "none"s */
2270
{
2271
char *interface = NULL;
2272
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2273
interface))){
2274
/* If interface name is "none", stop bringing up interfaces.
2275
Also remove all instances of "none" from the list */
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
while((interface = argz_next(mc.interfaces,
2281
mc.interfaces_size, interface))){
2282
if(strcmp(interface, "none") == 0){
2283
argz_delete(&mc.interfaces, &mc.interfaces_size,
2284
interface);
2285
interface = NULL;
2286
}
2287
}
2288
break;
2289
}
2290
bool interface_was_up = interface_is_up(interface);
2291
errno = bring_up_interface(interface, delay);
2292
if(not interface_was_up){
2293
if(errno != 0){
2294
perror_plus("Failed to bring up interface");
2295
} else {
2296
errno = argz_add(&interfaces_to_take_down,
2297
&interfaces_to_take_down_size,
2298
interface);
2299
if(errno != 0){
2300
perror_plus("argz_add");
2301
}
2302
}
2303
}
2304
}
2305
if(debug and (interfaces_to_take_down == NULL)){
2306
fprintf_plus(stderr, "No interfaces were brought up\n");
2307
}
2308
}
2309
2310
/* If we only got one interface, explicitly use only that one */
2311
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2312
if(debug){
2313
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2314
mc.interfaces);
2315
}
2316
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
2317
2018
}
2318
2019
2319
2020
if(quit_now){
2320
2021
goto end;
2321
2022
}
2322
2023
2323
ret = init_gnutls_global(pubkey, seckey, &mc);
2024
ret = init_gnutls_global(pubkey, seckey);
2324
2025
if(ret == -1){
2325
fprintf_plus(stderr, "init_gnutls_global failed\n");
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2326
2028
exitcode = EX_UNAVAILABLE;
2327
2029
goto end;
2328
2030
} else {
2333
2035
goto end;
2334
2036
}
2335
2037
2336
/* Try /run/tmp before /tmp */
2337
tempdir = mkdtemp(run_tempdir);
2338
if(tempdir == NULL and errno == ENOENT){
2339
if(debug){
2340
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2341
run_tempdir, old_tempdir);
2342
}
2343
tempdir = mkdtemp(old_tempdir);
2344
}
2345
if(tempdir == NULL){
2038
if(mkdtemp(tempdir) == NULL){
2346
2039
perror_plus("mkdtemp");
2347
2040
goto end;
2348
2041
}
2042
tempdir_created = true;
2349
2043
2350
2044
if(quit_now){
2351
2045
goto end;
2352
2046
}
2353
2047
2354
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2355
fprintf_plus(stderr, "init_gpgme failed\n");
2048
if(not init_gpgme(pubkey, seckey, tempdir)){
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2356
2051
exitcode = EX_UNAVAILABLE;
2357
2052
goto end;
2358
2053
} else {
2367
2062
/* Connect directly, do not use Zeroconf */
2368
2063
/* (Mainly meant for debugging) */
2369
2064
char *address = strrchr(connect_to, ':');
2370
2371
2065
if(address == NULL){
2372
fprintf_plus(stderr, "No colon in address\n");
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2373
2068
exitcode = EX_USAGE;
2374
2069
goto end;
2375
2070
}
2378
2073
goto end;
2379
2074
}
2380
2075
2381
in_port_t port;
2076
uint16_t port;
2382
2077
errno = 0;
2383
2078
tmpmax = strtoimax(address+1, &tmp, 10);
2384
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2385
or tmpmax != (in_port_t)tmpmax){
2386
fprintf_plus(stderr, "Bad port number\n");
2080
or tmpmax != (uint16_t)tmpmax){
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2387
2083
exitcode = EX_USAGE;
2388
2084
goto end;
2389
2085
}
2390
2086
2391
2087
if(quit_now){
2392
2088
goto end;
2393
2089
}
2394
2090
2395
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2396
2092
*address = '\0';
2397
2093
/* Colon in address indicates IPv6 */
2398
2094
int af;
2414
2110
}
2415
2111
2416
2112
while(not quit_now){
2417
ret = start_mandos_communication(address, port, if_index, af,
2418
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2419
2114
if(quit_now or ret == 0){
2420
2115
break;
2421
2116
}
2422
2117
if(debug){
2423
fprintf_plus(stderr, "Retrying in %d seconds\n",
2424
(int)retry_interval);
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2425
2120
}
2426
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2427
2122
}
2428
2123
2429
if(not quit_now){
2124
if (not quit_now){
2430
2125
exitcode = EXIT_SUCCESS;
2431
2126
}
2432
2127
2447
2142
config.publish_domain = 0;
2448
2143
2449
2144
/* Allocate a new server */
2450
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2451
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2452
2148
2453
2149
/* Free the Avahi configuration data */
2454
2150
avahi_server_config_free(&config);
2456
2152
2457
2153
/* Check if creating the Avahi server object succeeded */
2458
2154
if(mc.server == NULL){
2459
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2460
avahi_strerror(ret_errno));
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
2157
avahi_strerror(error));
2461
2158
exitcode = EX_UNAVAILABLE;
2462
2159
goto end;
2463
2160
}
2469
2166
/* Create the Avahi service browser */
2470
2167
sb = avahi_s_service_browser_new(mc.server, if_index,
2471
2168
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2472
NULL, 0, browse_callback,
2473
(void *)&mc);
2169
NULL, 0, browse_callback, NULL);
2474
2170
if(sb == NULL){
2475
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2476
avahi_strerror(avahi_server_errno(mc.server)));
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2477
2174
exitcode = EX_UNAVAILABLE;
2478
2175
goto end;
2479
2176
}
2485
2182
/* Run the main loop */
2486
2183
2487
2184
if(debug){
2488
fprintf_plus(stderr, "Starting Avahi loop search\n");
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2489
2187
}
2490
2491
ret = avahi_loop_with_timeout(simple_poll,
2492
(int)(retry_interval * 1000), &mc);
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2493
2191
if(debug){
2494
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2495
(ret == 0) ? "successfully" : "with error");
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2496
2195
}
2497
2196
2498
2197
end:
2499
2198
2500
2199
if(debug){
2501
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
2502
2202
}
2503
2203
2504
2204
/* Cleanup things */
2505
free(mc.interfaces);
2506
2507
2205
if(sb != NULL)
2508
2206
avahi_s_service_browser_free(sb);
2509
2207
2510
2208
if(mc.server != NULL)
2511
2209
avahi_server_free(mc.server);
2512
2210
2513
if(simple_poll != NULL)
2514
avahi_simple_poll_free(simple_poll);
2211
if(mc.simple_poll != NULL)
2212
avahi_simple_poll_free(mc.simple_poll);
2515
2213
2516
2214
if(gnutls_initialized){
2517
2215
gnutls_certificate_free_credentials(mc.cred);
2522
2220
if(gpgme_initialized){
2523
2221
gpgme_release(mc.ctx);
2524
2222
}
2525
2223
2526
2224
/* Cleans up the circular linked list of Mandos servers the client
2527
2225
has seen */
2528
2226
if(mc.current_server != NULL){
2534
2232
}
2535
2233
}
2536
2234
2537
/* Re-raise privileges */
2538
{
2539
ret_errno = raise_privileges();
2540
if(ret_errno != 0){
2541
perror_plus("Failed to raise privileges");
2542
} else {
2543
2544
/* Run network hooks */
2545
run_network_hooks("stop", interfaces_hooks != NULL ?
2546
interfaces_hooks : "", delay);
2547
2548
/* Take down the network interfaces which were brought up */
2549
{
2550
char *interface = NULL;
2551
while((interface=argz_next(interfaces_to_take_down,
2552
interfaces_to_take_down_size,
2553
interface))){
2554
ret_errno = take_down_interface(interface);
2555
if(ret_errno != 0){
2556
errno = ret_errno;
2557
perror_plus("Failed to take down interface");
2558
}
2559
}
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces needed to be taken"
2562
" down\n");
2563
}
2564
}
2235
/* XXX run network hooks "stop" here */
2236
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
2242
if(ret == -1){
2243
perror_plus("seteuid");
2565
2244
}
2566
2567
ret_errno = lower_privileges_permanently();
2568
if(ret_errno != 0){
2569
perror_plus("Failed to lower privileges permanently");
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2254
}
2255
}
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2265
}
2570
2266
}
2571
2267
}
2572
2268
2573
free(interfaces_to_take_down);
2574
free(interfaces_hooks);
2575
2576
2269
/* Removes the GPGME temp directory and all files inside */
2577
if(tempdir != NULL){
2270
if(tempdir_created){
2578
2271
struct dirent **direntries = NULL;
2579
2272
struct dirent *direntry = NULL;
2580
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2581
2274
alphasort);
2582
if(numentries > 0){
2275
if (numentries > 0){
2583
2276
for(int i = 0; i < numentries; i++){
2584
2277
direntry = direntries[i];
2585
2278
char *fullname = NULL;
2591
2284
}
2592
2285
ret = remove(fullname);
2593
2286
if(ret == -1){
2594
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2595
strerror(errno));
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2596
2289
}
2597
2290
free(fullname);
2598
2291
}
2599
2292
}
2600
2293
2601
2294
/* need to clean even if 0 because man page doesn't specify */
2602
2295
free(direntries);
2603
if(numentries == -1){
2296
if (numentries == -1){
2604
2297
perror_plus("scandir");
2605
2298
}
2606
2299
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0