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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:34:36 UTC
- Revision ID: teddy@recompile.se-20140310063436-zksdghqvv6k1pbyg
Do not add a new server to server list if clock_gettime() fails
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
- files added:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
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() */
90
97
91
98
#ifdef __linux__
92
99
#include <sys/klog.h> /* klogctl() */
110
117
init_gnutls_session(),
111
118
GNUTLS_* */
112
119
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
115
122
116
123
/* GPGME */
117
124
#include <gpgme.h> /* All GPGME types, constants and
134
141
static const char sys_class_net[] = "/sys/class/net";
135
142
char *connect_to = NULL;
136
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
137
146
138
147
/* Doubly linked list that need to be circularly linked when used */
139
148
typedef struct server{
140
149
const char *ip;
141
uint16_t port;
150
in_port_t port;
142
151
AvahiIfIndex if_index;
143
152
int af;
144
153
struct timespec last_seen;
148
157
149
158
/* Used for passing in values through the Avahi callback functions */
150
159
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
160
AvahiServer *server;
153
161
gnutls_certificate_credentials_t cred;
154
162
unsigned int dh_bits;
156
164
const char *priority;
157
165
gpgme_ctx_t ctx;
158
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
159
169
} mandos_context;
160
170
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 };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
166
173
167
174
sig_atomic_t quit_now = 0;
168
175
int signal_received = 0;
169
176
170
177
/* Function to use when printing errors */
171
178
void perror_plus(const char *print_text){
179
int e = errno;
172
180
fprintf(stderr, "Mandos plugin %s: ",
173
181
program_invocation_short_name);
182
errno = e;
174
183
perror(print_text);
175
184
}
176
185
186
__attribute__((format (gnu_printf, 2, 3)))
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
177
196
/*
178
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
198
* bytes. "buffer_capacity" is how much is currently allocated,
180
199
* "buffer_length" is how much is already used.
181
200
*/
182
201
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
202
size_t buffer_capacity){
184
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
187
210
return 0;
188
211
}
212
*buffer = new_buf;
189
213
buffer_capacity += BUFFER_SIZE;
190
214
}
191
215
return buffer_capacity;
192
216
}
193
217
194
218
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
198
221
int ret;
199
222
server *new_server = malloc(sizeof(server));
200
223
if(new_server == NULL){
201
224
perror_plus("malloc");
202
return -1;
225
return false;
203
226
}
204
227
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
228
.port = port,
229
.if_index = if_index,
230
.af = af };
208
231
if(new_server->ip == NULL){
209
232
perror_plus("strdup");
210
return -1;
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
211
239
}
212
240
/* Special case of first server */
213
if (mc.current_server == NULL){
241
if(*current_server == NULL){
214
242
new_server->next = new_server;
215
243
new_server->prev = new_server;
216
mc.current_server = new_server;
244
*current_server = new_server;
217
245
/* Place the new server last in the list */
218
246
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
221
249
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
250
(*current_server)->prev = new_server;
251
}
252
return true;
230
253
}
231
254
232
255
/*
233
256
* Initialize GPGME.
234
257
*/
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
237
260
gpgme_error_t rc;
238
261
gpgme_engine_info_t engine_info;
239
262
240
241
263
/*
242
264
* Helper function to insert pub and seckey to the engine keyring.
243
265
*/
254
276
255
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
278
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
259
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
260
281
return false;
261
282
}
262
283
263
rc = gpgme_op_import(mc.ctx, pgp_data);
284
rc = gpgme_op_import(mc->ctx, pgp_data);
264
285
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
268
288
return false;
269
289
}
270
290
277
297
}
278
298
279
299
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
300
fprintf_plus(stderr, "Initializing GPGME\n");
282
301
}
283
302
284
303
/* Init GPGME */
285
304
gpgme_check_version(NULL);
286
305
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
306
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
291
309
return false;
292
310
}
293
311
294
312
/* Set GPGME home directory for the OpenPGP engine only */
295
313
rc = gpgme_get_engine_info(&engine_info);
296
314
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
300
317
return false;
301
318
}
302
319
while(engine_info != NULL){
308
325
engine_info = engine_info->next;
309
326
}
310
327
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
313
330
return false;
314
331
}
315
332
316
333
/* Create new GPGME "context" */
317
rc = gpgme_new(&(mc.ctx));
334
rc = gpgme_new(&(mc->ctx));
318
335
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
322
339
return false;
323
340
}
324
341
335
352
*/
336
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
337
354
size_t crypto_size,
338
char **plaintext){
355
char **plaintext,
356
mandos_context *mc){
339
357
gpgme_data_t dh_crypto, dh_plain;
340
358
gpgme_error_t rc;
341
359
ssize_t ret;
343
361
ssize_t plaintext_length = 0;
344
362
345
363
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
348
365
}
349
366
350
367
/* Create new GPGME data buffer from memory cryptotext */
351
368
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
369
0);
353
370
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
356
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
357
373
return -1;
358
374
}
359
375
360
376
/* Create new empty GPGME data buffer for the plaintext */
361
377
rc = gpgme_data_new(&dh_plain);
362
378
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
365
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
366
382
gpgme_data_release(dh_crypto);
367
383
return -1;
368
384
}
369
385
370
386
/* Decrypt data from the cryptotext data buffer to the plaintext
371
387
data buffer */
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
389
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
377
392
plaintext_length = -1;
378
393
if(debug){
379
394
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
395
result = gpgme_op_decrypt_result(mc->ctx);
381
396
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
398
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
390
result->wrong_key_usage);
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
391
403
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
405
}
395
406
gpgme_recipient_t recipient;
396
407
recipient = result->recipients;
397
408
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
407
416
recipient = recipient->next;
408
417
}
409
418
}
412
421
}
413
422
414
423
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
417
425
}
418
426
419
427
/* Seek back to the beginning of the GPGME plaintext data buffer */
426
434
*plaintext = NULL;
427
435
while(true){
428
436
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
437
(size_t)plaintext_length,
438
plaintext_capacity);
431
439
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
435
443
}
436
444
437
445
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
458
}
451
459
452
460
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
461
fprintf_plus(stderr, "Decrypted password is: ");
455
462
for(ssize_t i = 0; i < plaintext_length; i++){
456
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
464
}
469
476
}
470
477
471
478
static const char * safer_gnutls_strerror(int value){
472
const char *ret = gnutls_strerror(value); /* Spurious warning from
473
-Wunreachable-code */
479
const char *ret = gnutls_strerror(value);
474
480
if(ret == NULL)
475
481
ret = "(unknown)";
476
482
return ret;
479
485
/* GnuTLS log function callback */
480
486
static void debuggnutls(__attribute__((unused)) int level,
481
487
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
488
fprintf_plus(stderr, "GnuTLS: %s", string);
483
489
}
484
490
485
491
static int init_gnutls_global(const char *pubkeyfilename,
486
const char *seckeyfilename){
492
const char *seckeyfilename,
493
mandos_context *mc){
487
494
int ret;
488
495
489
496
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
492
498
}
493
499
494
500
ret = gnutls_global_init();
495
501
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
498
504
return -1;
499
505
}
500
506
507
513
}
508
514
509
515
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
517
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
514
520
gnutls_global_deinit();
515
521
return -1;
516
522
}
517
523
518
524
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
seckeyfilename);
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
523
529
}
524
530
525
531
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
532
(mc->cred, pubkeyfilename, seckeyfilename,
527
533
GNUTLS_OPENPGP_FMT_BASE64);
528
534
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
safer_gnutls_strerror(ret));
535
540
goto globalfail;
536
541
}
537
542
538
543
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
544
ret = gnutls_dh_params_init(&mc->dh_params);
540
545
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
544
549
goto globalfail;
545
550
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
547
552
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
551
555
goto globalfail;
552
556
}
553
557
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
555
559
556
560
return 0;
557
561
558
562
globalfail:
559
563
560
gnutls_certificate_free_credentials(mc.cred);
564
gnutls_certificate_free_credentials(mc->cred);
561
565
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
566
gnutls_dh_params_deinit(mc->dh_params);
563
567
return -1;
564
568
}
565
569
566
static int init_gnutls_session(gnutls_session_t *session){
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
567
572
int ret;
568
573
/* GnuTLS session creation */
569
574
do {
573
578
}
574
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
580
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
578
safer_gnutls_strerror(ret));
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
579
584
}
580
585
581
586
{
582
587
const char *err;
583
588
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
585
590
if(quit_now){
586
591
gnutls_deinit(*session);
587
592
return -1;
588
593
}
589
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
595
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
595
599
gnutls_deinit(*session);
596
600
return -1;
597
601
}
599
603
600
604
do {
601
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
606
mc->cred);
603
607
if(quit_now){
604
608
gnutls_deinit(*session);
605
609
return -1;
606
610
}
607
611
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
612
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
612
615
gnutls_deinit(*session);
613
616
return -1;
614
617
}
616
619
/* ignore client certificate if any. */
617
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
621
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
620
623
621
624
return 0;
622
625
}
626
629
__attribute__((unused)) const char *txt){}
627
630
628
631
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, uint16_t port,
632
static int start_mandos_communication(const char *ip, in_port_t port,
630
633
AvahiIfIndex if_index,
631
int af){
634
int af, mandos_context *mc){
632
635
int ret, tcp_sd = -1;
633
636
ssize_t sret;
634
637
union {
659
662
pf = PF_INET;
660
663
break;
661
664
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
665
fprintf_plus(stderr, "Bad address family: %d\n", af);
664
666
errno = EINVAL;
665
667
return -1;
666
668
}
667
669
668
ret = init_gnutls_session(&session);
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
673
bool match = false;
674
{
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
678
if(if_nametoindex(interface) == (unsigned int)if_index){
679
match = true;
680
break;
681
}
682
}
683
}
684
if(not match){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
687
if(debug){
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
691
} else {
692
fprintf_plus(stderr, "Skipping server on non-used interface"
693
" \"%s\"\n",
694
if_indextoname((unsigned int)if_index,
695
interface));
696
}
697
}
698
return -1;
699
}
700
}
701
702
ret = init_gnutls_session(&session, mc);
669
703
if(ret != 0){
670
704
return -1;
671
705
}
672
706
673
707
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
676
"\n", ip, port);
708
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
677
710
}
678
711
679
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
705
738
}
706
739
if(ret == 0){
707
740
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
741
fprintf_plus(stderr, "Bad address: %s\n", ip);
710
742
errno = e;
711
743
goto mandos_end;
712
744
}
713
745
if(af == AF_INET6){
714
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wconversion and
716
-Wunreachable-code */
717
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
718
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
-Wunreachable-code*/
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
721
756
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
757
fprintf_plus(stderr, "An IPv6 link-local address is"
758
" incomplete without a network interface\n");
725
759
errno = EINVAL;
726
760
goto mandos_end;
727
761
}
729
763
to.in6.sin6_scope_id = (uint32_t)if_index;
730
764
}
731
765
} else {
732
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wconversion and
734
-Wunreachable-code */
766
to.in.sin_port = htons(port);
735
767
}
736
768
737
769
if(quit_now){
745
777
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
778
perror_plus("if_indextoname");
747
779
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
751
782
}
752
783
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
755
786
}
756
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
759
789
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
762
793
} else {
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
765
797
}
766
if(pcret == NULL){
767
perror_plus("inet_ntop");
768
} else {
769
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
772
}
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
773
804
}
774
805
}
775
806
802
833
while(true){
803
834
size_t out_size = strlen(out);
804
835
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
out_size - written));
836
out_size - written));
806
837
if(ret == -1){
807
838
int e = errno;
808
839
perror_plus("write");
828
859
}
829
860
830
861
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
862
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
833
863
}
834
864
835
865
if(quit_now){
837
867
goto mandos_end;
838
868
}
839
869
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
870
/* This casting via intptr_t is to eliminate warning about casting
871
an int to a pointer type. This is exactly how the GnuTLS Guile
872
function "set-session-transport-fd!" does it. */
873
gnutls_transport_set_ptr(session,
874
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
842
875
843
876
if(quit_now){
844
877
errno = EINTR;
855
888
856
889
if(ret != GNUTLS_E_SUCCESS){
857
890
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
891
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
860
892
gnutls_perror(ret);
861
893
}
862
894
errno = EPROTO;
866
898
/* Read OpenPGP packet that contains the wanted password */
867
899
868
900
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
901
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
902
" %s\n", ip);
871
903
}
872
904
873
905
while(true){
878
910
}
879
911
880
912
buffer_capacity = incbuffer(&buffer, buffer_length,
881
buffer_capacity);
913
buffer_capacity);
882
914
if(buffer_capacity == 0){
883
915
int e = errno;
884
916
perror_plus("incbuffer");
911
943
}
912
944
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
945
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
946
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
947
"***\n");
916
948
gnutls_perror(ret);
917
949
errno = EPROTO;
918
950
goto mandos_end;
919
951
}
920
952
break;
921
953
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
924
" encrypted session with Mandos server\n");
954
fprintf_plus(stderr, "Unknown error while reading data from"
955
" encrypted session with Mandos server\n");
925
956
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
957
errno = EIO;
927
958
goto mandos_end;
932
963
}
933
964
934
965
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
966
fprintf_plus(stderr, "Closing TLS session\n");
937
967
}
938
968
939
969
if(quit_now){
951
981
952
982
if(buffer_length > 0){
953
983
ssize_t decrypted_buffer_size;
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
buffer_length,
956
&decrypted_buffer);
984
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
957
986
if(decrypted_buffer_size >= 0){
958
987
959
988
written = 0;
969
998
if(ret == 0 and ferror(stdout)){
970
999
int e = errno;
971
1000
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
974
strerror(errno));
1001
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1002
strerror(errno));
975
1003
}
976
1004
errno = e;
977
1005
goto mandos_end;
1021
1049
AVAHI_GCC_UNUSED AvahiStringList *txt,
1022
1050
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1023
1051
flags,
1024
AVAHI_GCC_UNUSED void* userdata){
1025
assert(r);
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
1026
1056
1027
1057
/* Called whenever a service has been resolved successfully or
1028
1058
timed out */
1034
1064
switch(event){
1035
1065
default:
1036
1066
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
1039
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
avahi_strerror(avahi_server_errno(mc.server)));
1067
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1068
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1069
domain,
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
1041
1072
break;
1042
1073
1043
1074
case AVAHI_RESOLVER_FOUND:
1045
1076
char ip[AVAHI_ADDRESS_STR_MAX];
1046
1077
avahi_address_snprint(ip, sizeof(ip), address);
1047
1078
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
1079
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1080
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
host_name, ip, (intmax_t)interface, port);
1052
1082
}
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
1055
1087
if(ret == 0){
1056
avahi_simple_poll_quit(mc.simple_poll);
1088
avahi_simple_poll_quit(simple_poll);
1057
1089
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1093
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1094
" list\n", name);
1095
}
1060
1096
}
1061
1097
}
1062
1098
}
1072
1108
const char *domain,
1073
1109
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1074
1110
flags,
1075
AVAHI_GCC_UNUSED void* userdata){
1076
assert(b);
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
1077
1115
1078
1116
/* Called whenever a new services becomes available on the LAN or
1079
1117
is removed from the LAN */
1086
1124
default:
1087
1125
case AVAHI_BROWSER_FAILURE:
1088
1126
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
1091
avahi_strerror(avahi_server_errno(mc.server)));
1092
avahi_simple_poll_quit(mc.simple_poll);
1127
fprintf_plus(stderr, "(Avahi browser) %s\n",
1128
avahi_strerror(avahi_server_errno
1129
(((mandos_context*)mc)->server)));
1130
avahi_simple_poll_quit(simple_poll);
1093
1131
return;
1094
1132
1095
1133
case AVAHI_BROWSER_NEW:
1098
1136
the callback function is called the Avahi server will free the
1099
1137
resolver for us. */
1100
1138
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
name, type, domain, protocol, 0,
1103
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
1139
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1140
interface, protocol, name, type,
1141
domain, protocol, 0,
1142
resolve_callback, mc) == NULL)
1143
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1144
" %s\n", name,
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
1107
1147
break;
1108
1148
1109
1149
case AVAHI_BROWSER_REMOVE:
1112
1152
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
1153
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
1154
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1155
fprintf_plus(stderr, "No Mandos server found, still"
1156
" searching...\n");
1117
1157
}
1118
1158
break;
1119
1159
}
1128
1168
signal_received = sig;
1129
1169
int old_errno = errno;
1130
1170
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1133
1173
}
1134
1174
errno = old_errno;
1135
1175
}
1136
1176
1137
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
1178
int ret;
1179
error_t ret_errno;
1139
1180
1140
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
1182
if(s < 0){
1183
ret_errno = errno;
1142
1184
perror_plus("socket");
1185
errno = ret_errno;
1143
1186
return false;
1144
1187
}
1145
1188
strcpy(ifr->ifr_name, ifname);
1146
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
1190
if(ret == -1){
1148
1191
if(debug){
1192
ret_errno = errno;
1149
1193
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1150
1195
}
1151
1196
return false;
1152
1197
}
1158
1203
/* Reject the loopback device */
1159
1204
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
1205
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1206
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1207
ifname);
1163
1208
}
1164
1209
return false;
1165
1210
}
1166
1211
/* Accept point-to-point devices only if connect_to is specified */
1167
1212
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
1213
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1214
fprintf_plus(stderr, "Accepting point-to-point interface"
1215
" \"%s\"\n", ifname);
1171
1216
}
1172
1217
return true;
1173
1218
}
1174
1219
/* Otherwise, reject non-broadcast-capable devices */
1175
1220
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
1221
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1222
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1223
" \"%s\"\n", ifname);
1179
1224
}
1180
1225
return false;
1181
1226
}
1182
1227
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
1228
if(ifr->ifr_flags & IFF_NOARP){
1184
1229
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1230
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1231
ifname);
1187
1232
}
1188
1233
return false;
1189
1234
}
1190
1235
1191
1236
/* Accept this device */
1192
1237
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1238
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1195
1239
}
1196
1240
return true;
1197
1241
}
1209
1253
struct ifreq ifr;
1210
1254
if(not get_flags(if_entry->d_name, &ifr)){
1211
1255
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1256
fprintf_plus(stderr, "Failed to get flags for interface "
1257
"\"%s\"\n", if_entry->d_name);
1258
}
1259
return 0;
1260
}
1261
1262
if(not good_flags(if_entry->d_name, &ifr)){
1263
return 0;
1264
}
1265
return 1;
1266
}
1267
1268
/*
1269
* This function determines if a network interface is up.
1270
*/
1271
bool interface_is_up(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1282
}
1283
1284
/*
1285
* This function determines if a network interface is running
1286
*/
1287
bool interface_is_running(const char *interface){
1288
struct ifreq ifr;
1289
if(not get_flags(interface, &ifr)){
1290
if(debug){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1293
}
1294
return false;
1295
}
1296
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1269
1298
}
1270
1299
1271
1300
int notdotentries(const struct dirent *direntry){
1282
1311
/* Is this directory entry a runnable program? */
1283
1312
int runnable_hook(const struct dirent *direntry){
1284
1313
int ret;
1314
size_t sret;
1285
1315
struct stat st;
1286
1316
1287
1317
if((direntry->d_name)[0] == '\0'){
1289
1319
return 0;
1290
1320
}
1291
1321
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1323
"abcdefghijklmnopqrstuvwxyz"
1324
"0123456789"
1325
"_-");
1326
if((direntry->d_name)[sret] != '\0'){
1327
/* Contains non-allowed characters */
1328
if(debug){
1329
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1330
direntry->d_name);
1331
}
1332
return 0;
1333
}
1307
1334
1308
1335
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1311
1337
if(ret < 0){
1312
1338
perror_plus("asprintf");
1313
1339
return 0;
1316
1342
ret = stat(fullname, &st);
1317
1343
if(ret == -1){
1318
1344
if(debug){
1319
perror_plus("Could not stat plugin");
1345
perror_plus("Could not stat hook");
1320
1346
}
1321
1347
return 0;
1322
1348
}
1323
1349
if(not (S_ISREG(st.st_mode))){
1324
1350
/* Not a regular file */
1351
if(debug){
1352
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1353
direntry->d_name);
1354
}
1325
1355
return 0;
1326
1356
}
1327
1357
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
1358
/* Not executable */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1361
direntry->d_name);
1362
}
1329
1363
return 0;
1330
1364
}
1365
if(debug){
1366
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1367
direntry->d_name);
1368
}
1331
1369
return 1;
1332
1370
}
1333
1371
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1335
1374
int ret;
1336
1375
struct timespec now;
1337
1376
struct timespec waited_time;
1338
1377
intmax_t block_time;
1339
1378
1340
1379
while(true){
1341
if(mc.current_server == NULL){
1380
if(mc->current_server == NULL){
1342
1381
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1382
fprintf_plus(stderr, "Wait until first server is found."
1383
" No timeout!\n");
1345
1384
}
1346
1385
ret = avahi_simple_poll_iterate(s, -1);
1347
1386
} else {
1348
1387
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1388
fprintf_plus(stderr, "Check current_server if we should run"
1389
" it, or wait\n");
1352
1390
}
1353
1391
/* the current time */
1354
1392
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1359
1397
/* Calculating in ms how long time between now and server
1360
1398
who we visted longest time ago. Now - last seen. */
1361
1399
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1400
- mc->current_server->last_seen.tv_sec);
1363
1401
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1402
- mc->current_server->last_seen.tv_nsec);
1365
1403
/* total time is 10s/10,000ms.
1366
1404
Converting to s from ms by dividing by 1,000,
1367
1405
and ns to ms by dividing by 1,000,000. */
1370
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1409
1372
1410
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1412
block_time);
1375
1413
}
1376
1414
1377
1415
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1416
ret = start_mandos_communication(mc->current_server->ip,
1417
mc->current_server->port,
1418
mc->current_server->if_index,
1419
mc->current_server->af, mc);
1382
1420
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1421
avahi_simple_poll_quit(s);
1384
1422
return 0;
1385
1423
}
1386
1424
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1425
&mc->current_server->last_seen);
1388
1426
if(ret == -1){
1389
1427
perror_plus("clock_gettime");
1390
1428
return -1;
1391
1429
}
1392
mc.current_server = mc.current_server->next;
1430
mc->current_server = mc->current_server->next;
1393
1431
block_time = 0; /* Call avahi to find new Mandos
1394
1432
servers, but don't block */
1395
1433
}
1404
1442
}
1405
1443
}
1406
1444
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
bool run_network_hooks(const char *mode, const char *interface,
1498
const float delay){
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
alphasort);
1502
if(numhooks == -1){
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1510
}
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
if(ret < 0){
1520
perror_plus("asprintf");
1521
continue;
1522
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
pid_t hook_pid = fork();
1528
if(hook_pid == 0){
1529
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
dup2(devnull, STDIN_FILENO);
1545
close(devnull);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
if(ret == -1){
1549
perror_plus("setenv");
1550
_exit(EX_OSERR);
1551
}
1552
ret = setenv("DEVICE", interface, 1);
1553
if(ret == -1){
1554
perror_plus("setenv");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1558
if(ret == -1){
1559
perror_plus("setenv");
1560
_exit(EX_OSERR);
1561
}
1562
ret = setenv("MODE", mode, 1);
1563
if(ret == -1){
1564
perror_plus("setenv");
1565
_exit(EX_OSERR);
1566
}
1567
char *delaystring;
1568
ret = asprintf(&delaystring, "%f", delay);
1569
if(ret == -1){
1570
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1572
}
1573
ret = setenv("DELAY", delaystring, 1);
1574
if(ret == -1){
1575
free(delaystring);
1576
perror_plus("setenv");
1577
_exit(EX_OSERR);
1578
}
1579
free(delaystring);
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
1591
} else {
1592
int status;
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1595
free(fullname);
1596
continue;
1597
}
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1603
free(fullname);
1604
continue;
1605
}
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1609
WTERMSIG(status));
1610
free(fullname);
1611
continue;
1612
} else {
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1615
free(fullname);
1616
continue;
1617
}
1618
}
1619
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1623
}
1624
}
1625
close(devnull);
1626
}
1627
return true;
1628
}
1629
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1638
if(if_index == 0){
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1640
errno = old_errno;
1641
return ENXIO;
1642
}
1643
1644
if(quit_now){
1645
errno = old_errno;
1646
return EINTR;
1647
}
1648
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1651
ret_errno = errno;
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1654
return ret_errno;
1655
}
1656
network.ifr_flags |= IFF_UP;
1657
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
1660
ret_errno = errno;
1661
perror_plus("socket");
1662
errno = old_errno;
1663
return ret_errno;
1664
}
1665
1666
if(quit_now){
1667
close(sd);
1668
errno = old_errno;
1669
return EINTR;
1670
}
1671
1672
if(debug){
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1674
interface);
1675
}
1676
1677
/* Raise priviliges */
1678
raise_privileges();
1679
1680
#ifdef __linux__
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1688
}
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
1692
#ifdef __linux__
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
1697
}
1698
}
1699
#endif /* __linux__ */
1700
1701
/* Lower privileges */
1702
lower_privileges();
1703
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1706
if(ret == -1){
1707
perror_plus("close");
1708
}
1709
1710
if(ret_setflags == -1){
1711
errno = ret_errno;
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
} else if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1718
interface);
1719
}
1720
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1725
break;
1726
}
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1731
}
1732
}
1733
1734
errno = old_errno;
1735
return 0;
1736
}
1737
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1742
if(if_index == 0){
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1744
errno = old_errno;
1745
return ENXIO;
1746
}
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1750
ret_errno = errno;
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1753
return ret_errno;
1754
}
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1756
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1758
if(sd < 0){
1759
ret_errno = errno;
1760
perror_plus("socket");
1761
errno = old_errno;
1762
return ret_errno;
1763
}
1764
1765
if(debug){
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1767
interface);
1768
}
1769
1770
/* Raise priviliges */
1771
raise_privileges();
1772
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1774
ret_errno = errno;
1775
1776
/* Lower privileges */
1777
lower_privileges();
1778
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1781
if(ret == -1){
1782
perror_plus("close");
1783
}
1784
1785
if(ret_setflags == -1){
1786
errno = ret_errno;
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
errno = old_errno;
1789
return ret_errno;
1790
}
1791
} else if(debug){
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1793
interface);
1794
}
1795
1796
errno = old_errno;
1797
return 0;
1798
}
1799
1407
1800
int main(int argc, char *argv[]){
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1408
1805
AvahiSServiceBrowser *sb = NULL;
1409
int error;
1806
error_t ret_errno;
1410
1807
int ret;
1411
1808
intmax_t tmpmax;
1412
1809
char *tmp;
1413
1810
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
1415
struct ifreq network;
1416
int sd = -1;
1417
bool take_down_interface = false;
1418
uid_t uid;
1419
gid_t gid;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1420
1813
char tempdir[] = "/tmp/mandosXXXXXX";
1421
1814
bool tempdir_created = false;
1422
1815
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
1816
const char *seckey = PATHDIR "/" SECKEY;
1424
1817
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1425
1819
1426
1820
bool gnutls_initialized = false;
1427
1821
bool gpgme_initialized = false;
1489
1883
.group = 2 },
1490
1884
{ .name = "retry", .key = 132,
1491
1885
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1886
.doc = "Retry interval used when denied by the Mandos server",
1493
1887
.group = 2 },
1494
1888
{ .name = "network-hook-dir", .key = 133,
1495
1889
.arg = "DIR",
1518
1912
connect_to = arg;
1519
1913
break;
1520
1914
case 'i': /* --interface */
1521
interface = arg;
1915
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1916
arg, (int)',');
1917
if(ret_errno != 0){
1918
argp_error(state, "%s", strerror(ret_errno));
1919
}
1522
1920
break;
1523
1921
case 's': /* --seckey */
1524
1922
seckey = arg;
1567
1965
argp_state_help(state, state->out_stream,
1568
1966
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
1967
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1968
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1572
1969
exit(argp_err_exit_status);
1573
1970
break;
1574
1971
default:
1601
1998
{
1602
1999
/* Work around Debian bug #633582:
1603
2000
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
2001
1606
2002
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
2003
if(raise_privileges() == 0){
2004
struct stat st;
2005
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
int seckey_fd = open(seckey, O_RDONLY);
2008
if(seckey_fd == -1){
2009
perror_plus("open");
2010
} else {
2011
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2012
if(ret == -1){
2013
perror_plus("fstat");
2014
} else {
2015
if(S_ISREG(st.st_mode)
2016
and st.st_uid == 0 and st.st_gid == 0){
2017
ret = fchown(seckey_fd, uid, gid);
2018
if(ret == -1){
2019
perror_plus("fchown");
2020
}
2021
}
2022
}
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2024
}
2025
}
2026
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2029
if(pubkey_fd == -1){
2030
perror_plus("open");
2031
} else {
2032
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2033
if(ret == -1){
2034
perror_plus("fstat");
2035
} else {
2036
if(S_ISREG(st.st_mode)
2037
and st.st_uid == 0 and st.st_gid == 0){
2038
ret = fchown(pubkey_fd, uid, gid);
2039
if(ret == -1){
2040
perror_plus("fchown");
2041
}
2042
}
2043
}
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2048
/* Lower privileges */
2049
lower_privileges();
2050
}
2051
}
2052
2053
/* Remove invalid interface names (except "none") */
2054
{
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2057
interface))){
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2063
}
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2065
interface = NULL;
2066
}
2067
}
2068
}
2069
2070
/* Run network hooks */
2071
{
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
2076
goto end;
2077
}
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2080
}
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
1752
2084
}
1753
2085
}
1754
2086
1756
2088
avahi_set_log_function(empty_log);
1757
2089
}
1758
2090
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1793
2091
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
2092
from the signal handler */
1795
2093
/* Initialize the pseudo-RNG for Avahi */
1796
2094
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
2097
fprintf_plus(stderr,
2098
"Avahi: Failed to create simple poll object.\n");
1801
2099
exitcode = EX_UNAVAILABLE;
1802
2100
goto end;
1803
2101
}
1865
2163
}
1866
2164
}
1867
2165
1868
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1889
#ifdef __linux__
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1894
if(ret == -1){
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1897
}
1898
#endif /* __linux__ */
1899
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1904
#ifdef __linux__
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1907
if(ret == -1){
1908
perror_plus("klogctl");
1909
}
1910
}
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1918
goto end;
1919
}
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1939
goto end;
1940
}
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1949
#ifdef __linux__
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1952
if(ret == -1){
1953
perror_plus("klogctl");
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2171
alphasort);
2172
if(ret >= 1){
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2177
if(ret_errno != 0){
2178
errno = ret_errno;
2179
perror_plus("argz_add");
2180
continue;
2181
}
2182
if(debug){
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
2185
}
2186
}
2187
free(direntries);
2188
} else {
2189
free(direntries);
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2192
goto end;
2193
}
2194
}
2195
2196
/* Bring up interfaces which are down, and remove any "none"s */
2197
{
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2200
interface))){
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2211
interface);
2212
interface = NULL;
1954
2213
}
1955
2214
}
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1963
goto end;
1964
}
1965
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1973
2215
break;
1974
2216
}
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1979
}
1980
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1987
}
1988
#ifdef __linux__
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1992
if(ret == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2223
} else {
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2229
perror_plus("argz_add");
2230
}
2231
}
2232
}
2233
}
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2236
}
2237
}
2238
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2241
if(debug){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2243
mc.interfaces);
2244
}
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
2246
}
2013
2247
2014
2248
if(quit_now){
2015
2249
goto end;
2016
2250
}
2017
2251
2018
ret = init_gnutls_global(pubkey, seckey);
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2019
2253
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
2022
2255
exitcode = EX_UNAVAILABLE;
2023
2256
goto end;
2024
2257
} else {
2039
2272
goto end;
2040
2273
}
2041
2274
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2276
fprintf_plus(stderr, "init_gpgme failed\n");
2045
2277
exitcode = EX_UNAVAILABLE;
2046
2278
goto end;
2047
2279
} else {
2056
2288
/* Connect directly, do not use Zeroconf */
2057
2289
/* (Mainly meant for debugging) */
2058
2290
char *address = strrchr(connect_to, ':');
2291
2059
2292
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2293
fprintf_plus(stderr, "No colon in address\n");
2062
2294
exitcode = EX_USAGE;
2063
2295
goto end;
2064
2296
}
2067
2299
goto end;
2068
2300
}
2069
2301
2070
uint16_t port;
2302
in_port_t port;
2071
2303
errno = 0;
2072
2304
tmpmax = strtoimax(address+1, &tmp, 10);
2073
2305
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2306
or tmpmax != (in_port_t)tmpmax){
2307
fprintf_plus(stderr, "Bad port number\n");
2077
2308
exitcode = EX_USAGE;
2078
2309
goto end;
2079
2310
}
2080
2311
2081
2312
if(quit_now){
2082
2313
goto end;
2083
2314
}
2084
2315
2085
port = (uint16_t)tmpmax;
2316
port = (in_port_t)tmpmax;
2086
2317
*address = '\0';
2087
2318
/* Colon in address indicates IPv6 */
2088
2319
int af;
2104
2335
}
2105
2336
2106
2337
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2108
2340
if(quit_now or ret == 0){
2109
2341
break;
2110
2342
}
2111
2343
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2344
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
(int)retry_interval);
2114
2346
}
2115
sleep((int)retry_interval);
2347
sleep((unsigned int)retry_interval);
2116
2348
}
2117
2349
2118
2350
if (not quit_now){
2136
2368
config.publish_domain = 0;
2137
2369
2138
2370
/* Allocate a new server */
2139
mc.server = avahi_server_new(avahi_simple_poll_get
2140
(mc.simple_poll), &config, NULL,
2141
NULL, &error);
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
2142
2373
2143
2374
/* Free the Avahi configuration data */
2144
2375
avahi_server_config_free(&config);
2146
2377
2147
2378
/* Check if creating the Avahi server object succeeded */
2148
2379
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
2152
2382
exitcode = EX_UNAVAILABLE;
2153
2383
goto end;
2154
2384
}
2160
2390
/* Create the Avahi service browser */
2161
2391
sb = avahi_s_service_browser_new(mc.server, if_index,
2162
2392
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
NULL, 0, browse_callback, NULL);
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
2164
2395
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
2167
avahi_strerror(avahi_server_errno(mc.server)));
2396
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
avahi_strerror(avahi_server_errno(mc.server)));
2168
2398
exitcode = EX_UNAVAILABLE;
2169
2399
goto end;
2170
2400
}
2176
2406
/* Run the main loop */
2177
2407
2178
2408
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2181
2410
}
2182
2411
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2185
2414
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2415
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
(ret == 0) ? "successfully" : "with error");
2189
2417
}
2190
2418
2191
2419
end:
2192
2420
2193
2421
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2422
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2196
2423
}
2197
2424
2198
2425
/* Cleanup things */
2426
free(mc.interfaces);
2427
2199
2428
if(sb != NULL)
2200
2429
avahi_s_service_browser_free(sb);
2201
2430
2202
2431
if(mc.server != NULL)
2203
2432
avahi_server_free(mc.server);
2204
2433
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
2207
2436
2208
2437
if(gnutls_initialized){
2209
2438
gnutls_certificate_free_credentials(mc.cred);
2214
2443
if(gpgme_initialized){
2215
2444
gpgme_release(mc.ctx);
2216
2445
}
2217
2446
2218
2447
/* Cleans up the circular linked list of Mandos servers the client
2219
2448
has seen */
2220
2449
if(mc.current_server != NULL){
2226
2455
}
2227
2456
}
2228
2457
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2458
/* Re-raise priviliges */
2459
{
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
2248
2476
}
2249
2477
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2259
2481
}
2260
2482
}
2483
2484
lower_privileges_permanently();
2261
2485
}
2262
2486
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2489
2263
2490
/* Removes the GPGME temp directory and all files inside */
2264
2491
if(tempdir_created){
2265
2492
struct dirent **direntries = NULL;
2278
2505
}
2279
2506
ret = remove(fullname);
2280
2507
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2509
strerror(errno));
2283
2510
}
2284
2511
free(fullname);
2285
2512
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0