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- Committer: Teddy Hogeborn
- Date: 2014-06-14 23:43:07 UTC
- Revision ID: teddy@recompile.se-20140614234307-i0mh9r2n4orkqtki
plugin-runner: Release memory and close FD's correctly in all cases.
* plugins.d/mandos-client.c (main): Init "direntries" to NULL. Close
"dir_fd" at fallback label. Do
not free "direntries" if
scandirat() or scandir() failed.
Do free(direntries) at fallback
label.
* plugins.d/mandos-client.c (main): Init "direntries" to NULL. Close
"dir_fd" at fallback label. Do
not free "direntries" if
scandirat() or scandir() failed.
Do free(direntries) at fallback
label.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
90
98
91
99
#ifdef __linux__
92
100
#include <sys/klog.h> /* klogctl() */
134
142
static const char sys_class_net[] = "/sys/class/net";
135
143
char *connect_to = NULL;
136
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
137
148
138
149
/* Doubly linked list that need to be circularly linked when used */
139
150
typedef struct server{
140
151
const char *ip;
141
uint16_t port;
152
in_port_t port;
142
153
AvahiIfIndex if_index;
143
154
int af;
144
155
struct timespec last_seen;
148
159
149
160
/* Used for passing in values through the Avahi callback functions */
150
161
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
162
AvahiServer *server;
153
163
gnutls_certificate_credentials_t cred;
154
164
unsigned int dh_bits;
156
166
const char *priority;
157
167
gpgme_ctx_t ctx;
158
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
159
171
} mandos_context;
160
172
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
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
166
175
167
176
sig_atomic_t quit_now = 0;
168
177
int signal_received = 0;
169
178
170
179
/* Function to use when printing errors */
171
180
void perror_plus(const char *print_text){
181
int e = errno;
172
182
fprintf(stderr, "Mandos plugin %s: ",
173
183
program_invocation_short_name);
184
errno = e;
174
185
perror(print_text);
175
186
}
176
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
177
198
/*
178
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
200
* bytes. "buffer_capacity" is how much is currently allocated,
180
201
* "buffer_length" is how much is already used.
181
202
*/
203
__attribute__((nonnull, warn_unused_result))
182
204
size_t incbuffer(char **buffer, size_t buffer_length,
183
205
size_t buffer_capacity){
184
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
187
213
return 0;
188
214
}
215
*buffer = new_buf;
189
216
buffer_capacity += BUFFER_SIZE;
190
217
}
191
218
return buffer_capacity;
192
219
}
193
220
194
221
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
197
225
int ret;
198
226
server *new_server = malloc(sizeof(server));
199
227
if(new_server == NULL){
200
228
perror_plus("malloc");
201
return -1;
229
return false;
202
230
}
203
231
*new_server = (server){ .ip = strdup(ip),
204
232
.port = port,
206
234
.af = af };
207
235
if(new_server->ip == NULL){
208
236
perror_plus("strdup");
209
return -1;
237
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
210
243
}
211
244
/* Special case of first server */
212
if (mc.current_server == NULL){
245
if(*current_server == NULL){
213
246
new_server->next = new_server;
214
247
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
248
*current_server = new_server;
217
249
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
220
253
new_server->prev->next = new_server;
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;
254
(*current_server)->prev = new_server;
255
}
256
return true;
229
257
}
230
258
231
259
/*
232
260
* Initialize GPGME.
233
261
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
236
267
gpgme_error_t rc;
237
268
gpgme_engine_info_t engine_info;
238
269
239
240
270
/*
241
271
* Helper function to insert pub and seckey to the engine keyring.
242
272
*/
243
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
244
274
int ret;
245
275
int fd;
246
276
gpgme_data_t pgp_data;
253
283
254
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
285
if(rc != GPG_ERR_NO_ERROR){
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
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
259
288
return false;
260
289
}
261
290
262
rc = gpgme_op_import(mc.ctx, pgp_data);
291
rc = gpgme_op_import(mc->ctx, pgp_data);
263
292
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
267
295
return false;
268
296
}
269
297
276
304
}
277
305
278
306
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
307
fprintf_plus(stderr, "Initializing GPGME\n");
281
308
}
282
309
283
310
/* Init GPGME */
284
311
gpgme_check_version(NULL);
285
312
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
313
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
290
316
return false;
291
317
}
292
318
293
319
/* Set GPGME home directory for the OpenPGP engine only */
294
320
rc = gpgme_get_engine_info(&engine_info);
295
321
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
299
324
return false;
300
325
}
301
326
while(engine_info != NULL){
307
332
engine_info = engine_info->next;
308
333
}
309
334
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
312
337
return false;
313
338
}
314
339
315
340
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
341
rc = gpgme_new(&(mc->ctx));
317
342
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
321
346
return false;
322
347
}
323
348
332
357
* Decrypt OpenPGP data.
333
358
* Returns -1 on error
334
359
*/
360
__attribute__((nonnull, warn_unused_result))
335
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
362
size_t crypto_size,
337
char **plaintext){
363
char **plaintext,
364
mandos_context *mc){
338
365
gpgme_data_t dh_crypto, dh_plain;
339
366
gpgme_error_t rc;
340
367
ssize_t ret;
342
369
ssize_t plaintext_length = 0;
343
370
344
371
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
373
}
348
374
349
375
/* Create new GPGME data buffer from memory cryptotext */
350
376
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
377
0);
352
378
if(rc != GPG_ERR_NO_ERROR){
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
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
356
381
return -1;
357
382
}
358
383
359
384
/* Create new empty GPGME data buffer for the plaintext */
360
385
rc = gpgme_data_new(&dh_plain);
361
386
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
365
390
gpgme_data_release(dh_crypto);
366
391
return -1;
367
392
}
368
393
369
394
/* Decrypt data from the cryptotext data buffer to the plaintext
370
395
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
397
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
376
400
plaintext_length = -1;
377
401
if(debug){
378
402
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
403
result = gpgme_op_decrypt_result(mc->ctx);
380
404
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
406
} else {
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);
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
390
411
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
413
}
394
414
gpgme_recipient_t recipient;
395
415
recipient = result->recipients;
396
416
while(recipient != NULL){
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");
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
406
424
recipient = recipient->next;
407
425
}
408
426
}
411
429
}
412
430
413
431
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
433
}
417
434
418
435
/* Seek back to the beginning of the GPGME plaintext data buffer */
449
466
}
450
467
451
468
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
469
fprintf_plus(stderr, "Decrypted password is: ");
454
470
for(ssize_t i = 0; i < plaintext_length; i++){
455
471
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
472
}
467
483
return plaintext_length;
468
484
}
469
485
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
473
489
if(ret == NULL)
474
490
ret = "(unknown)";
475
491
return ret;
476
492
}
477
493
478
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
479
496
static void debuggnutls(__attribute__((unused)) int level,
480
497
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
498
fprintf_plus(stderr, "GnuTLS: %s", string);
482
499
}
483
500
501
__attribute__((nonnull, warn_unused_result))
484
502
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
503
const char *seckeyfilename,
504
mandos_context *mc){
486
505
int ret;
487
506
488
507
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
509
}
492
510
493
511
ret = gnutls_global_init();
494
512
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
497
515
return -1;
498
516
}
499
517
506
524
}
507
525
508
526
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
528
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
513
531
gnutls_global_deinit();
514
532
return -1;
515
533
}
516
534
517
535
if(debug){
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);
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
522
540
}
523
541
524
542
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
543
(mc->cred, pubkeyfilename, seckeyfilename,
526
544
GNUTLS_OPENPGP_FMT_BASE64);
527
545
if(ret != GNUTLS_E_SUCCESS){
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));
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
534
551
goto globalfail;
535
552
}
536
553
537
554
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
555
ret = gnutls_dh_params_init(&mc->dh_params);
539
556
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
543
560
goto globalfail;
544
561
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
563
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
550
566
goto globalfail;
551
567
}
552
568
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
570
555
571
return 0;
556
572
557
573
globalfail:
558
574
559
gnutls_certificate_free_credentials(mc.cred);
575
gnutls_certificate_free_credentials(mc->cred);
560
576
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
577
gnutls_dh_params_deinit(mc->dh_params);
562
578
return -1;
563
579
}
564
580
565
static int init_gnutls_session(gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
566
584
int ret;
567
585
/* GnuTLS session creation */
568
586
do {
572
590
}
573
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
592
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
578
596
}
579
597
580
598
{
581
599
const char *err;
582
600
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
602
if(quit_now){
585
603
gnutls_deinit(*session);
586
604
return -1;
587
605
}
588
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
607
if(ret != GNUTLS_E_SUCCESS){
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));
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
594
611
gnutls_deinit(*session);
595
612
return -1;
596
613
}
598
615
599
616
do {
600
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
618
mc->cred);
602
619
if(quit_now){
603
620
gnutls_deinit(*session);
604
621
return -1;
605
622
}
606
623
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
624
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
611
627
gnutls_deinit(*session);
612
628
return -1;
613
629
}
615
631
/* ignore client certificate if any. */
616
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
617
633
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
635
620
636
return 0;
621
637
}
625
641
__attribute__((unused)) const char *txt){}
626
642
627
643
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
629
646
AvahiIfIndex if_index,
630
int af){
647
int af, mandos_context *mc){
631
648
int ret, tcp_sd = -1;
632
649
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
650
struct sockaddr_storage to;
637
651
char *buffer = NULL;
638
652
char *decrypted_buffer = NULL;
639
653
size_t buffer_length = 0;
658
672
pf = PF_INET;
659
673
break;
660
674
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
676
errno = EINVAL;
664
677
return -1;
665
678
}
666
679
667
ret = init_gnutls_session(&session);
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
668
713
if(ret != 0){
669
714
return -1;
670
715
}
671
716
672
717
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
676
720
}
677
721
678
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
690
734
691
735
memset(&to, 0, sizeof(to));
692
736
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
695
739
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
698
742
}
699
743
if(ret < 0 ){
700
744
int e = errno;
704
748
}
705
749
if(ret == 0){
706
750
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
752
errno = e;
710
753
goto mandos_end;
711
754
}
712
755
if(af == AF_INET6){
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*/
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
720
759
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
724
762
errno = EINVAL;
725
763
goto mandos_end;
726
764
}
727
765
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
729
767
}
730
768
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
734
770
}
735
771
736
772
if(quit_now){
744
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
781
perror_plus("if_indextoname");
746
782
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
750
785
}
751
786
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
754
789
}
755
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
792
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
761
797
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
764
802
}
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
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
772
809
}
773
810
}
774
811
778
815
}
779
816
780
817
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
782
820
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
784
823
}
785
824
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
826
int e = errno;
788
827
perror_plus("connect");
789
828
errno = e;
827
866
}
828
867
829
868
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
870
}
833
871
834
872
if(quit_now){
836
874
goto mandos_end;
837
875
}
838
876
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
882
842
883
if(quit_now){
843
884
errno = EINTR;
854
895
855
896
if(ret != GNUTLS_E_SUCCESS){
856
897
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
899
gnutls_perror(ret);
860
900
}
861
901
errno = EPROTO;
865
905
/* Read OpenPGP packet that contains the wanted password */
866
906
867
907
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
870
910
}
871
911
872
912
while(true){
910
950
}
911
951
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
952
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
915
955
gnutls_perror(ret);
916
956
errno = EPROTO;
917
957
goto mandos_end;
918
958
}
919
959
break;
920
960
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
924
963
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
964
errno = EIO;
926
965
goto mandos_end;
931
970
}
932
971
933
972
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
973
fprintf_plus(stderr, "Closing TLS session\n");
936
974
}
937
975
938
976
if(quit_now){
951
989
if(buffer_length > 0){
952
990
ssize_t decrypted_buffer_size;
953
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
992
&decrypted_buffer, mc);
955
993
if(decrypted_buffer_size >= 0){
956
994
957
995
written = 0;
967
1005
if(ret == 0 and ferror(stdout)){
968
1006
int e = errno;
969
1007
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
973
1010
}
974
1011
errno = e;
975
1012
goto mandos_end;
1006
1043
return retval;
1007
1044
}
1008
1045
1046
__attribute__((nonnull))
1009
1047
static void resolve_callback(AvahiSServiceResolver *r,
1010
1048
AvahiIfIndex interface,
1011
1049
AvahiProtocol proto,
1019
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1059
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1024
1064
1025
1065
/* Called whenever a service has been resolved successfully or
1026
1066
timed out */
1032
1072
switch(event){
1033
1073
default:
1034
1074
case AVAHI_RESOLVER_FAILURE:
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)));
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1039
1080
break;
1040
1081
1041
1082
case AVAHI_RESOLVER_FOUND:
1043
1084
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1085
avahi_address_snprint(ip, sizeof(ip), address);
1045
1086
if(debug){
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);
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
1050
1090
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1053
1095
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1096
avahi_simple_poll_quit(simple_poll);
1055
1097
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
1058
1104
}
1059
1105
}
1060
1106
}
1070
1116
const char *domain,
1071
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1118
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1075
1123
1076
1124
/* Called whenever a new services becomes available on the LAN or
1077
1125
is removed from the LAN */
1084
1132
default:
1085
1133
case AVAHI_BROWSER_FAILURE:
1086
1134
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);
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1091
1139
return;
1092
1140
1093
1141
case AVAHI_BROWSER_NEW:
1096
1144
the callback function is called the Avahi server will free the
1097
1145
resolver for us. */
1098
1146
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)));
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1105
1155
break;
1106
1156
1107
1157
case AVAHI_BROWSER_REMOVE:
1110
1160
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1161
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1162
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
1115
1165
}
1116
1166
break;
1117
1167
}
1126
1176
signal_received = sig;
1127
1177
int old_errno = errno;
1128
1178
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1131
1181
}
1132
1182
errno = old_errno;
1133
1183
}
1134
1184
1185
__attribute__((nonnull, warn_unused_result))
1135
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1187
int ret;
1188
error_t ret_errno;
1137
1189
1138
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1191
if(s < 0){
1192
ret_errno = errno;
1140
1193
perror_plus("socket");
1194
errno = ret_errno;
1141
1195
return false;
1142
1196
}
1143
1197
strcpy(ifr->ifr_name, ifname);
1144
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1199
if(ret == -1){
1146
1200
if(debug){
1201
ret_errno = errno;
1147
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1148
1204
}
1149
1205
return false;
1150
1206
}
1151
1207
return true;
1152
1208
}
1153
1209
1210
__attribute__((nonnull, warn_unused_result))
1154
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1212
1156
1213
/* Reject the loopback device */
1157
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1215
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1161
1218
}
1162
1219
return false;
1163
1220
}
1164
1221
/* Accept point-to-point devices only if connect_to is specified */
1165
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1223
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1169
1226
}
1170
1227
return true;
1171
1228
}
1172
1229
/* Otherwise, reject non-broadcast-capable devices */
1173
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1231
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1177
1234
}
1178
1235
return false;
1179
1236
}
1180
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1238
if(ifr->ifr_flags & IFF_NOARP){
1182
1239
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1185
1242
}
1186
1243
return false;
1187
1244
}
1188
1245
1189
1246
/* Accept this device */
1190
1247
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1249
}
1194
1250
return true;
1195
1251
}
1199
1255
* corresponds to an acceptable network device.
1200
1256
* (This function is passed to scandir(3) as a filter function.)
1201
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1202
1259
int good_interface(const struct dirent *if_entry){
1203
1260
if(if_entry->d_name[0] == '.'){
1204
1261
return 0;
1207
1264
struct ifreq ifr;
1208
1265
if(not get_flags(if_entry->d_name, &ifr)){
1209
1266
if(debug){
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
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1269
1314
int notdotentries(const struct dirent *direntry){
1270
1315
/* Skip "." and ".." */
1271
1316
if(direntry->d_name[0] == '.'
1278
1323
}
1279
1324
1280
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1281
1327
int runnable_hook(const struct dirent *direntry){
1282
1328
int ret;
1283
1329
size_t sret;
1291
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
1338
"abcdefghijklmnopqrstuvwxyz"
1293
1339
"0123456789"
1294
"_-");
1340
"_.-");
1295
1341
if((direntry->d_name)[sret] != '\0'){
1296
1342
/* Contains non-allowed characters */
1297
1343
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1301
1346
}
1302
1347
return 0;
1303
1348
}
1304
1349
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1313
1351
if(ret == -1){
1314
1352
if(debug){
1315
1353
perror_plus("Could not stat hook");
1319
1357
if(not (S_ISREG(st.st_mode))){
1320
1358
/* Not a regular file */
1321
1359
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1325
1362
}
1326
1363
return 0;
1327
1364
}
1328
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1366
/* Not executable */
1330
1367
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1334
1370
}
1335
1371
return 0;
1336
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1337
1377
return 1;
1338
1378
}
1339
1379
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1341
1383
int ret;
1342
1384
struct timespec now;
1343
1385
struct timespec waited_time;
1344
1386
intmax_t block_time;
1345
1387
1346
1388
while(true){
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");
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1351
1393
}
1352
1394
ret = avahi_simple_poll_iterate(s, -1);
1353
1395
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1358
1399
}
1359
1400
/* the current time */
1360
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1406
/* Calculating in ms how long time between now and server
1366
1407
who we visted longest time ago. Now - last seen. */
1367
1408
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1409
- mc->current_server->last_seen.tv_sec);
1369
1410
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1411
- mc->current_server->last_seen.tv_nsec);
1371
1412
/* total time is 10s/10,000ms.
1372
1413
Converting to s from ms by dividing by 1,000,
1373
1414
and ns to ms by dividing by 1,000,000. */
1375
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1376
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1418
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1381
1422
}
1382
1423
1383
1424
if(block_time <= 0){
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);
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1388
1429
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1430
avahi_simple_poll_quit(s);
1390
1431
return 0;
1391
1432
}
1392
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1434
&mc->current_server->last_seen);
1394
1435
if(ret == -1){
1395
1436
perror_plus("clock_gettime");
1396
1437
return -1;
1397
1438
}
1398
mc.current_server = mc.current_server->next;
1439
mc->current_server = mc->current_server->next;
1399
1440
block_time = 0; /* Call avahi to find new Mandos
1400
1441
servers, but don't block */
1401
1442
}
1403
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
1445
}
1405
1446
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1447
if(ret > 0 or errno != EINTR){
1407
1448
return (ret != 1) ? ret : 0;
1408
1449
}
1409
1450
}
1410
1451
}
1411
1452
}
1412
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1512
const float delay){
1513
struct dirent **direntries = NULL;
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1518
if(debug){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1521
}
1522
} else {
1523
perror_plus("open");
1524
}
1525
return;
1526
}
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1540
if(numhooks == -1){
1541
perror_plus("scandir");
1542
return;
1543
}
1544
struct dirent *direntry;
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1549
if(debug){
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1551
direntry->d_name);
1552
}
1553
pid_t hook_pid = fork();
1554
if(hook_pid == 0){
1555
/* Child */
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
perror_plus("Failed to raise privileges");
1737
}
1738
1739
#ifdef __linux__
1740
int ret_linux;
1741
bool restore_loglevel = false;
1742
if(ret_errno == 0){
1743
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1744
messages about the network interface to mess up the prompt */
1745
ret_linux = klogctl(8, NULL, 5);
1746
if(ret_linux == -1){
1747
perror_plus("klogctl");
1748
} else {
1749
restore_loglevel = true;
1750
}
1751
}
1752
#endif /* __linux__ */
1753
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1754
ioctl_errno = errno;
1755
#ifdef __linux__
1756
if(restore_loglevel){
1757
ret_linux = klogctl(7, NULL, 0);
1758
if(ret_linux == -1){
1759
perror_plus("klogctl");
1760
}
1761
}
1762
#endif /* __linux__ */
1763
1764
/* If raise_privileges() succeeded above */
1765
if(ret_errno == 0){
1766
/* Lower privileges */
1767
ret_errno = lower_privileges();
1768
if(ret_errno != 0){
1769
errno = ret_errno;
1770
perror_plus("Failed to lower privileges");
1771
}
1772
}
1773
1774
/* Close the socket */
1775
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1776
if(ret == -1){
1777
perror_plus("close");
1778
}
1779
1780
if(ret_setflags == -1){
1781
errno = ioctl_errno;
1782
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1783
errno = old_errno;
1784
return ioctl_errno;
1785
}
1786
} else if(debug){
1787
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1788
interface);
1789
}
1790
1791
/* Sleep checking until interface is running.
1792
Check every 0.25s, up to total time of delay */
1793
for(int i=0; i < delay * 4; i++){
1794
if(interface_is_running(interface)){
1795
break;
1796
}
1797
struct timespec sleeptime = { .tv_nsec = 250000000 };
1798
ret = nanosleep(&sleeptime, NULL);
1799
if(ret == -1 and errno != EINTR){
1800
perror_plus("nanosleep");
1801
}
1802
}
1803
1804
errno = old_errno;
1805
return 0;
1806
}
1807
1808
__attribute__((nonnull, warn_unused_result))
1809
error_t take_down_interface(const char *const interface){
1810
error_t old_errno = errno;
1811
struct ifreq network;
1812
unsigned int if_index = if_nametoindex(interface);
1813
if(if_index == 0){
1814
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1815
errno = old_errno;
1816
return ENXIO;
1817
}
1818
if(interface_is_up(interface)){
1819
error_t ret_errno = 0, ioctl_errno = 0;
1820
if(not get_flags(interface, &network) and debug){
1821
ret_errno = errno;
1822
fprintf_plus(stderr, "Failed to get flags for interface "
1823
"\"%s\"\n", interface);
1824
errno = old_errno;
1825
return ret_errno;
1826
}
1827
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1828
1829
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1830
if(sd == -1){
1831
ret_errno = errno;
1832
perror_plus("socket");
1833
errno = old_errno;
1834
return ret_errno;
1835
}
1836
1837
if(debug){
1838
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1839
interface);
1840
}
1841
1842
/* Raise privileges */
1843
ret_errno = raise_privileges();
1844
if(ret_errno != 0){
1845
perror_plus("Failed to raise privileges");
1846
}
1847
1848
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1849
ioctl_errno = errno;
1850
1851
/* If raise_privileges() succeeded above */
1852
if(ret_errno == 0){
1853
/* Lower privileges */
1854
ret_errno = lower_privileges();
1855
if(ret_errno != 0){
1856
errno = ret_errno;
1857
perror_plus("Failed to lower privileges");
1858
}
1859
}
1860
1861
/* Close the socket */
1862
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1863
if(ret == -1){
1864
perror_plus("close");
1865
}
1866
1867
if(ret_setflags == -1){
1868
errno = ioctl_errno;
1869
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1870
errno = old_errno;
1871
return ioctl_errno;
1872
}
1873
} else if(debug){
1874
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1875
interface);
1876
}
1877
1878
errno = old_errno;
1879
return 0;
1880
}
1881
1413
1882
int main(int argc, char *argv[]){
1883
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1884
.priority = "SECURE256:!CTYPE-X.509:"
1885
"+CTYPE-OPENPGP", .current_server = NULL,
1886
.interfaces = NULL, .interfaces_size = 0 };
1414
1887
AvahiSServiceBrowser *sb = NULL;
1415
int error;
1888
error_t ret_errno;
1416
1889
int ret;
1417
1890
intmax_t tmpmax;
1418
1891
char *tmp;
1419
1892
int exitcode = EXIT_SUCCESS;
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;
1893
char *interfaces_to_take_down = NULL;
1894
size_t interfaces_to_take_down_size = 0;
1895
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1896
char old_tempdir[] = "/tmp/mandosXXXXXX";
1897
char *tempdir = NULL;
1428
1898
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
1899
const char *seckey = PATHDIR "/" SECKEY;
1430
1900
const char *pubkey = PATHDIR "/" PUBKEY;
1901
char *interfaces_hooks = NULL;
1431
1902
1432
1903
bool gnutls_initialized = false;
1433
1904
bool gpgme_initialized = false;
1495
1966
.group = 2 },
1496
1967
{ .name = "retry", .key = 132,
1497
1968
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1969
.doc = "Retry interval used when denied by the Mandos server",
1499
1970
.group = 2 },
1500
1971
{ .name = "network-hook-dir", .key = 133,
1501
1972
.arg = "DIR",
1524
1995
connect_to = arg;
1525
1996
break;
1526
1997
case 'i': /* --interface */
1527
interface = arg;
1998
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1999
arg, (int)',');
2000
if(ret_errno != 0){
2001
argp_error(state, "%s", strerror(ret_errno));
2002
}
1528
2003
break;
1529
2004
case 's': /* --seckey */
1530
2005
seckey = arg;
1573
2048
argp_state_help(state, state->out_stream,
1574
2049
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
2050
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
2051
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1578
2052
exit(argp_err_exit_status);
1579
2053
break;
1580
2054
default:
1607
2081
{
1608
2082
/* Work around Debian bug #633582:
1609
2083
<http://bugs.debian.org/633582> */
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");
2084
2085
/* Re-raise privileges */
2086
ret_errno = raise_privileges();
2087
if(ret_errno != 0){
2088
errno = ret_errno;
2089
perror_plus("Failed to raise privileges");
1675
2090
} else {
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("MANDOSNETHOOKDIR", hookdir, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("DEVICE", interface, 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
ret = setenv("MODE", "start", 1);
1707
if(ret == -1){
1708
perror_plus("setenv");
1709
exit(1);
1710
}
1711
char *delaystring;
1712
ret = asprintf(&delaystring, "%f", delay);
1713
if(ret == -1){
1714
perror_plus("asprintf");
1715
exit(1);
1716
}
1717
ret = setenv("DELAY", delaystring, 1);
1718
if(ret == -1){
1719
free(delaystring);
1720
perror_plus("setenv");
1721
exit(1);
1722
}
1723
free(delaystring);
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1726
} else {
1727
int status;
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1730
free(fullname);
1731
continue;
1732
}
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1739
free(fullname);
1740
continue;
1741
}
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1746
WTERMSIG(status));
1747
free(fullname);
1748
continue;
1749
} else {
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1752
direntry->d_name);
1753
free(fullname);
1754
continue;
1755
}
1756
}
1757
free(fullname);
1758
if(quit_now){
1759
goto end;
1760
}
1761
}
1762
close(devnull);
1763
}
2091
struct stat st;
2092
2093
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2094
int seckey_fd = open(seckey, O_RDONLY);
2095
if(seckey_fd == -1){
2096
perror_plus("open");
2097
} else {
2098
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2099
if(ret == -1){
2100
perror_plus("fstat");
2101
} else {
2102
if(S_ISREG(st.st_mode)
2103
and st.st_uid == 0 and st.st_gid == 0){
2104
ret = fchown(seckey_fd, uid, gid);
2105
if(ret == -1){
2106
perror_plus("fchown");
2107
}
2108
}
2109
}
2110
TEMP_FAILURE_RETRY(close(seckey_fd));
2111
}
2112
}
2113
2114
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2115
int pubkey_fd = open(pubkey, O_RDONLY);
2116
if(pubkey_fd == -1){
2117
perror_plus("open");
2118
} else {
2119
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2120
if(ret == -1){
2121
perror_plus("fstat");
2122
} else {
2123
if(S_ISREG(st.st_mode)
2124
and st.st_uid == 0 and st.st_gid == 0){
2125
ret = fchown(pubkey_fd, uid, gid);
2126
if(ret == -1){
2127
perror_plus("fchown");
2128
}
2129
}
2130
}
2131
TEMP_FAILURE_RETRY(close(pubkey_fd));
2132
}
2133
}
2134
2135
/* Lower privileges */
2136
ret_errno = lower_privileges();
2137
if(ret_errno != 0){
2138
errno = ret_errno;
2139
perror_plus("Failed to lower privileges");
2140
}
2141
}
2142
}
2143
2144
/* Remove invalid interface names (except "none") */
2145
{
2146
char *interface = NULL;
2147
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2148
interface))){
2149
if(strcmp(interface, "none") != 0
2150
and if_nametoindex(interface) == 0){
2151
if(interface[0] != '\0'){
2152
fprintf_plus(stderr, "Not using nonexisting interface"
2153
" \"%s\"\n", interface);
2154
}
2155
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2156
interface = NULL;
2157
}
2158
}
2159
}
2160
2161
/* Run network hooks */
2162
{
2163
if(mc.interfaces != NULL){
2164
interfaces_hooks = malloc(mc.interfaces_size);
2165
if(interfaces_hooks == NULL){
2166
perror_plus("malloc");
2167
goto end;
2168
}
2169
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2170
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2171
}
2172
run_network_hooks("start", interfaces_hooks != NULL ?
2173
interfaces_hooks : "", delay);
1764
2174
}
1765
2175
1766
2176
if(not debug){
1767
2177
avahi_set_log_function(empty_log);
1768
2178
}
1769
2179
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1787
}
1788
if(interface == NULL){
1789
perror_plus("malloc");
1790
free(direntries);
1791
exitcode = EXIT_FAILURE;
1792
goto end;
1793
}
1794
free(direntries);
1795
} else {
1796
free(direntries);
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
}
1803
1804
2180
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
2181
from the signal handler */
1806
2182
/* Initialize the pseudo-RNG for Avahi */
1807
2183
srand((unsigned int) time(NULL));
1808
mc.simple_poll = avahi_simple_poll_new();
1809
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
2184
simple_poll = avahi_simple_poll_new();
2185
if(simple_poll == NULL){
2186
fprintf_plus(stderr,
2187
"Avahi: Failed to create simple poll object.\n");
1812
2188
exitcode = EX_UNAVAILABLE;
1813
2189
goto end;
1814
2190
}
1876
2252
}
1877
2253
}
1878
2254
1879
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1882
if(if_index == 0){
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1886
goto end;
1887
}
1888
1889
if(quit_now){
1890
goto end;
1891
}
1892
1893
/* Re-raise priviliges */
1894
errno = 0;
1895
ret = seteuid(0);
1896
if(ret == -1){
1897
perror_plus("seteuid");
1898
}
1899
1900
#ifdef __linux__
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1903
ret = klogctl(8, NULL, 5);
1904
bool restore_loglevel = true;
1905
if(ret == -1){
1906
restore_loglevel = false;
1907
perror_plus("klogctl");
1908
}
1909
#endif /* __linux__ */
1910
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1912
if(sd < 0){
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1915
#ifdef __linux__
1916
if(restore_loglevel){
1917
ret = klogctl(7, NULL, 0);
1918
if(ret == -1){
1919
perror_plus("klogctl");
1920
}
1921
}
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1924
errno = 0;
1925
ret = seteuid(uid);
1926
if(ret == -1){
1927
perror_plus("seteuid");
1928
}
1929
goto end;
1930
}
1931
strcpy(network.ifr_name, interface);
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1933
if(ret == -1){
1934
perror_plus("ioctl SIOCGIFFLAGS");
1935
#ifdef __linux__
1936
if(restore_loglevel){
1937
ret = klogctl(7, NULL, 0);
1938
if(ret == -1){
1939
perror_plus("klogctl");
1940
}
1941
}
1942
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
if((network.ifr_flags & IFF_UP) == 0){
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1956
if(ret == -1){
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1960
#ifdef __linux__
1961
if(restore_loglevel){
1962
ret = klogctl(7, NULL, 0);
1963
if(ret == -1){
1964
perror_plus("klogctl");
2255
/* If no interfaces were specified, make a list */
2256
if(mc.interfaces == NULL){
2257
struct dirent **direntries = NULL;
2258
/* Look for any good interfaces */
2259
ret = scandir(sys_class_net, &direntries, good_interface,
2260
alphasort);
2261
if(ret >= 1){
2262
/* Add all found interfaces to interfaces list */
2263
for(int i = 0; i < ret; ++i){
2264
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2265
direntries[i]->d_name);
2266
if(ret_errno != 0){
2267
errno = ret_errno;
2268
perror_plus("argz_add");
2269
continue;
2270
}
2271
if(debug){
2272
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2273
direntries[i]->d_name);
2274
}
2275
}
2276
free(direntries);
2277
} else {
2278
if(ret == 0){
2279
free(direntries);
2280
}
2281
fprintf_plus(stderr, "Could not find a network interface\n");
2282
exitcode = EXIT_FAILURE;
2283
goto end;
2284
}
2285
}
2286
2287
/* Bring up interfaces which are down, and remove any "none"s */
2288
{
2289
char *interface = NULL;
2290
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2291
interface))){
2292
/* If interface name is "none", stop bringing up interfaces.
2293
Also remove all instances of "none" from the list */
2294
if(strcmp(interface, "none") == 0){
2295
argz_delete(&mc.interfaces, &mc.interfaces_size,
2296
interface);
2297
interface = NULL;
2298
while((interface = argz_next(mc.interfaces,
2299
mc.interfaces_size, interface))){
2300
if(strcmp(interface, "none") == 0){
2301
argz_delete(&mc.interfaces, &mc.interfaces_size,
2302
interface);
2303
interface = NULL;
1965
2304
}
1966
2305
}
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1969
errno = 0;
1970
ret = seteuid(uid);
1971
if(ret == -1){
1972
perror_plus("seteuid");
1973
}
1974
goto end;
1975
}
1976
}
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1979
for(int i=0; i < delay * 4; i++){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_RUNNING){
1984
2306
break;
1985
2307
}
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
ret = nanosleep(&sleeptime, NULL);
1988
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1990
}
1991
}
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
}
1999
#ifdef __linux__
2000
if(restore_loglevel){
2001
/* Restores kernel loglevel to default */
2002
ret = klogctl(7, NULL, 0);
2003
if(ret == -1){
2004
perror_plus("klogctl");
2005
}
2006
}
2007
#endif /* __linux__ */
2008
/* Lower privileges */
2009
errno = 0;
2010
if(take_down_interface){
2011
/* Lower privileges */
2012
ret = seteuid(uid);
2013
if(ret == -1){
2014
perror_plus("seteuid");
2015
}
2016
} else {
2017
/* Lower privileges permanently */
2018
ret = setuid(uid);
2019
if(ret == -1){
2020
perror_plus("setuid");
2021
}
2022
}
2308
bool interface_was_up = interface_is_up(interface);
2309
errno = bring_up_interface(interface, delay);
2310
if(not interface_was_up){
2311
if(errno != 0){
2312
perror_plus("Failed to bring up interface");
2313
} else {
2314
errno = argz_add(&interfaces_to_take_down,
2315
&interfaces_to_take_down_size,
2316
interface);
2317
if(errno != 0){
2318
perror_plus("argz_add");
2319
}
2320
}
2321
}
2322
}
2323
if(debug and (interfaces_to_take_down == NULL)){
2324
fprintf_plus(stderr, "No interfaces were brought up\n");
2325
}
2326
}
2327
2328
/* If we only got one interface, explicitly use only that one */
2329
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2330
if(debug){
2331
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2332
mc.interfaces);
2333
}
2334
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2023
2335
}
2024
2336
2025
2337
if(quit_now){
2026
2338
goto end;
2027
2339
}
2028
2340
2029
ret = init_gnutls_global(pubkey, seckey);
2341
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
2342
if(ret == -1){
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2343
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2344
exitcode = EX_UNAVAILABLE;
2034
2345
goto end;
2035
2346
} else {
2040
2351
goto end;
2041
2352
}
2042
2353
2043
if(mkdtemp(tempdir) == NULL){
2354
/* Try /run/tmp before /tmp */
2355
tempdir = mkdtemp(run_tempdir);
2356
if(tempdir == NULL and errno == ENOENT){
2357
if(debug){
2358
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2359
run_tempdir, old_tempdir);
2360
}
2361
tempdir = mkdtemp(old_tempdir);
2362
}
2363
if(tempdir == NULL){
2044
2364
perror_plus("mkdtemp");
2045
2365
goto end;
2046
2366
}
2047
tempdir_created = true;
2048
2367
2049
2368
if(quit_now){
2050
2369
goto end;
2051
2370
}
2052
2371
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
2372
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2373
fprintf_plus(stderr, "init_gpgme failed\n");
2056
2374
exitcode = EX_UNAVAILABLE;
2057
2375
goto end;
2058
2376
} else {
2067
2385
/* Connect directly, do not use Zeroconf */
2068
2386
/* (Mainly meant for debugging) */
2069
2387
char *address = strrchr(connect_to, ':');
2388
2070
2389
if(address == NULL){
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
2390
fprintf_plus(stderr, "No colon in address\n");
2073
2391
exitcode = EX_USAGE;
2074
2392
goto end;
2075
2393
}
2078
2396
goto end;
2079
2397
}
2080
2398
2081
uint16_t port;
2399
in_port_t port;
2082
2400
errno = 0;
2083
2401
tmpmax = strtoimax(address+1, &tmp, 10);
2084
2402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
or tmpmax != (uint16_t)tmpmax){
2086
fprintf(stderr, "Mandos plugin mandos-client: "
2087
"Bad port number\n");
2403
or tmpmax != (in_port_t)tmpmax){
2404
fprintf_plus(stderr, "Bad port number\n");
2088
2405
exitcode = EX_USAGE;
2089
2406
goto end;
2090
2407
}
2091
2408
2092
2409
if(quit_now){
2093
2410
goto end;
2094
2411
}
2095
2412
2096
port = (uint16_t)tmpmax;
2413
port = (in_port_t)tmpmax;
2097
2414
*address = '\0';
2098
2415
/* Colon in address indicates IPv6 */
2099
2416
int af;
2115
2432
}
2116
2433
2117
2434
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2435
ret = start_mandos_communication(address, port, if_index, af,
2436
&mc);
2119
2437
if(quit_now or ret == 0){
2120
2438
break;
2121
2439
}
2122
2440
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2441
fprintf_plus(stderr, "Retrying in %d seconds\n",
2442
(int)retry_interval);
2125
2443
}
2126
sleep((int)retry_interval);
2444
sleep((unsigned int)retry_interval);
2127
2445
}
2128
2446
2129
if (not quit_now){
2447
if(not quit_now){
2130
2448
exitcode = EXIT_SUCCESS;
2131
2449
}
2132
2450
2147
2465
config.publish_domain = 0;
2148
2466
2149
2467
/* Allocate a new server */
2150
mc.server = avahi_server_new(avahi_simple_poll_get
2151
(mc.simple_poll), &config, NULL,
2152
NULL, &error);
2468
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2469
&config, NULL, NULL, &ret_errno);
2153
2470
2154
2471
/* Free the Avahi configuration data */
2155
2472
avahi_server_config_free(&config);
2157
2474
2158
2475
/* Check if creating the Avahi server object succeeded */
2159
2476
if(mc.server == NULL){
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
2162
avahi_strerror(error));
2477
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2478
avahi_strerror(ret_errno));
2163
2479
exitcode = EX_UNAVAILABLE;
2164
2480
goto end;
2165
2481
}
2171
2487
/* Create the Avahi service browser */
2172
2488
sb = avahi_s_service_browser_new(mc.server, if_index,
2173
2489
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2174
NULL, 0, browse_callback, NULL);
2490
NULL, 0, browse_callback,
2491
(void *)&mc);
2175
2492
if(sb == NULL){
2176
fprintf(stderr, "Mandos plugin mandos-client: "
2177
"Failed to create service browser: %s\n",
2178
avahi_strerror(avahi_server_errno(mc.server)));
2493
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2494
avahi_strerror(avahi_server_errno(mc.server)));
2179
2495
exitcode = EX_UNAVAILABLE;
2180
2496
goto end;
2181
2497
}
2187
2503
/* Run the main loop */
2188
2504
2189
2505
if(debug){
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2506
fprintf_plus(stderr, "Starting Avahi loop search\n");
2192
2507
}
2193
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2508
2509
ret = avahi_loop_with_timeout(simple_poll,
2510
(int)(retry_interval * 1000), &mc);
2196
2511
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2512
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2513
(ret == 0) ? "successfully" : "with error");
2200
2514
}
2201
2515
2202
2516
end:
2203
2517
2204
2518
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
2519
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2207
2520
}
2208
2521
2209
2522
/* Cleanup things */
2523
free(mc.interfaces);
2524
2210
2525
if(sb != NULL)
2211
2526
avahi_s_service_browser_free(sb);
2212
2527
2213
2528
if(mc.server != NULL)
2214
2529
avahi_server_free(mc.server);
2215
2530
2216
if(mc.simple_poll != NULL)
2217
avahi_simple_poll_free(mc.simple_poll);
2531
if(simple_poll != NULL)
2532
avahi_simple_poll_free(simple_poll);
2218
2533
2219
2534
if(gnutls_initialized){
2220
2535
gnutls_certificate_free_credentials(mc.cred);
2225
2540
if(gpgme_initialized){
2226
2541
gpgme_release(mc.ctx);
2227
2542
}
2228
2543
2229
2544
/* Cleans up the circular linked list of Mandos servers the client
2230
2545
has seen */
2231
2546
if(mc.current_server != NULL){
2237
2552
}
2238
2553
}
2239
2554
2240
/* XXX run network hooks "stop" here */
2241
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2245
errno = 0;
2246
ret = seteuid(0);
2247
if(ret == -1){
2248
perror_plus("seteuid");
2555
/* Re-raise privileges */
2556
{
2557
ret_errno = raise_privileges();
2558
if(ret_errno != 0){
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2249
2583
}
2250
if(geteuid() == 0){
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2257
if(ret == -1){
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
}
2260
}
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2262
if(ret == -1){
2263
perror_plus("close");
2264
}
2265
/* Lower privileges permanently */
2266
errno = 0;
2267
ret = setuid(uid);
2268
if(ret == -1){
2269
perror_plus("setuid");
2270
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
perror_plus("Failed to lower privileges permanently");
2271
2588
}
2272
2589
}
2273
2590
2591
free(interfaces_to_take_down);
2592
free(interfaces_hooks);
2593
2274
2594
/* Removes the GPGME temp directory and all files inside */
2275
if(tempdir_created){
2595
if(tempdir != NULL){
2276
2596
struct dirent **direntries = NULL;
2277
struct dirent *direntry = NULL;
2278
int numentries = scandir(tempdir, &direntries, notdotentries,
2279
alphasort);
2280
if (numentries > 0){
2281
for(int i = 0; i < numentries; i++){
2282
direntry = direntries[i];
2283
char *fullname = NULL;
2284
ret = asprintf(&fullname, "%s/%s", tempdir,
2285
direntry->d_name);
2286
if(ret < 0){
2287
perror_plus("asprintf");
2288
continue;
2289
}
2290
ret = remove(fullname);
2291
if(ret == -1){
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2294
}
2295
free(fullname);
2597
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2598
O_NOFOLLOW));
2599
if(tempdir_fd == -1){
2600
perror_plus("open");
2601
} else {
2602
#ifdef __GLIBC__
2603
#if __GLIBC_PREREQ(2, 15)
2604
int numentries = scandirat(tempdir_fd, ".", &direntries,
2605
notdotentries, alphasort);
2606
#else /* not __GLIBC_PREREQ(2, 15) */
2607
int numentries = scandir(tempdir, &direntries, notdotentries,
2608
alphasort);
2609
#endif /* not __GLIBC_PREREQ(2, 15) */
2610
#else /* not __GLIBC__ */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC__ */
2614
if(numentries >= 0){
2615
for(int i = 0; i < numentries; i++){
2616
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2617
if(ret == -1){
2618
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2619
" \"%s\", 0): %s\n", tempdir,
2620
direntries[i]->d_name, strerror(errno));
2621
}
2622
}
2623
2624
/* need to clean even if 0 because man page doesn't specify */
2625
free(direntries);
2626
if(numentries == -1){
2627
perror_plus("scandir");
2628
}
2629
ret = rmdir(tempdir);
2630
if(ret == -1 and errno != ENOENT){
2631
perror_plus("rmdir");
2632
}
2296
2633
}
2297
}
2298
2299
/* need to clean even if 0 because man page doesn't specify */
2300
free(direntries);
2301
if (numentries == -1){
2302
perror_plus("scandir");
2303
}
2304
ret = rmdir(tempdir);
2305
if(ret == -1 and errno != ENOENT){
2306
perror_plus("rmdir");
2634
TEMP_FAILURE_RETRY(close(tempdir_fd));
2307
2635
}
2308
2636
}
2309
2637
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0