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- Committer: Teddy Hogeborn
- Date: 2014-03-10 07:04:09 UTC
- Revision ID: teddy@recompile.se-20140310070409-ho6p1wrnpopi2ny1
White space fix: change "if (" to "if(" in C code.
* plugins.d/askpass-fifo.c (error_plus): White space fix.
* plugins.d/password-prompt.c (error_plus, conflict_detection,
main): - '' -
* plugins.d/plymouth.c (error_plus, exec_and_wait, get_pid): - '' -
* plugins.d/splashy.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
* plugins.d/askpass-fifo.c (error_plus): White space fix.
* plugins.d/password-prompt.c (error_plus, conflict_detection,
main): - '' -
* plugins.d/plymouth.c (error_plus, exec_and_wait, get_pid): - '' -
* plugins.d/splashy.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
- 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() */
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,
182
201
size_t incbuffer(char **buffer, size_t buffer_length,
183
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, AvahiIfIndex if_index,
196
int af){
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
197
221
int ret;
198
222
server *new_server = malloc(sizeof(server));
199
223
if(new_server == NULL){
200
224
perror_plus("malloc");
201
return -1;
225
return false;
202
226
}
203
227
*new_server = (server){ .ip = strdup(ip),
204
228
.port = port,
206
230
.af = af };
207
231
if(new_server->ip == NULL){
208
232
perror_plus("strdup");
209
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;
210
239
}
211
240
/* Special case of first server */
212
if (mc.current_server == NULL){
241
if(*current_server == NULL){
213
242
new_server->next = new_server;
214
243
new_server->prev = new_server;
215
mc.current_server = new_server;
244
*current_server = new_server;
216
245
/* Place the new server last in the list */
217
246
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
220
249
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;
250
(*current_server)->prev = new_server;
251
}
252
return true;
229
253
}
230
254
231
255
/*
232
256
* Initialize GPGME.
233
257
*/
234
258
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
259
const char *tempdir, mandos_context *mc){
236
260
gpgme_error_t rc;
237
261
gpgme_engine_info_t engine_info;
238
262
239
240
263
/*
241
264
* Helper function to insert pub and seckey to the engine keyring.
242
265
*/
253
276
254
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
278
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));
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
259
281
return false;
260
282
}
261
283
262
rc = gpgme_op_import(mc.ctx, pgp_data);
284
rc = gpgme_op_import(mc->ctx, pgp_data);
263
285
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));
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
267
288
return false;
268
289
}
269
290
276
297
}
277
298
278
299
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
300
fprintf_plus(stderr, "Initializing GPGME\n");
281
301
}
282
302
283
303
/* Init GPGME */
284
304
gpgme_check_version(NULL);
285
305
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
306
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));
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
290
309
return false;
291
310
}
292
311
293
312
/* Set GPGME home directory for the OpenPGP engine only */
294
313
rc = gpgme_get_engine_info(&engine_info);
295
314
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));
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
299
317
return false;
300
318
}
301
319
while(engine_info != NULL){
307
325
engine_info = engine_info->next;
308
326
}
309
327
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"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);
312
330
return false;
313
331
}
314
332
315
333
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
334
rc = gpgme_new(&(mc->ctx));
317
335
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));
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
321
339
return false;
322
340
}
323
341
334
352
*/
335
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
354
size_t crypto_size,
337
char **plaintext){
355
char **plaintext,
356
mandos_context *mc){
338
357
gpgme_data_t dh_crypto, dh_plain;
339
358
gpgme_error_t rc;
340
359
ssize_t ret;
342
361
ssize_t plaintext_length = 0;
343
362
344
363
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
365
}
348
366
349
367
/* Create new GPGME data buffer from memory cryptotext */
350
368
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
369
0);
352
370
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));
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
356
373
return -1;
357
374
}
358
375
359
376
/* Create new empty GPGME data buffer for the plaintext */
360
377
rc = gpgme_data_new(&dh_plain);
361
378
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));
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
365
382
gpgme_data_release(dh_crypto);
366
383
return -1;
367
384
}
368
385
369
386
/* Decrypt data from the cryptotext data buffer to the plaintext
370
387
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
389
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));
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
376
392
plaintext_length = -1;
377
393
if(debug){
378
394
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
395
result = gpgme_op_decrypt_result(mc->ctx);
380
396
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
398
} 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);
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);
390
403
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
405
}
394
406
gpgme_recipient_t recipient;
395
407
recipient = result->recipients;
396
408
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");
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");
406
416
recipient = recipient->next;
407
417
}
408
418
}
411
421
}
412
422
413
423
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
425
}
417
426
418
427
/* Seek back to the beginning of the GPGME plaintext data buffer */
449
458
}
450
459
451
460
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
461
fprintf_plus(stderr, "Decrypted password is: ");
454
462
for(ssize_t i = 0; i < plaintext_length; i++){
455
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
464
}
468
476
}
469
477
470
478
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
479
const char *ret = gnutls_strerror(value);
473
480
if(ret == NULL)
474
481
ret = "(unknown)";
475
482
return ret;
478
485
/* GnuTLS log function callback */
479
486
static void debuggnutls(__attribute__((unused)) int level,
480
487
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
488
fprintf_plus(stderr, "GnuTLS: %s", string);
482
489
}
483
490
484
491
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
492
const char *seckeyfilename,
493
mandos_context *mc){
486
494
int ret;
487
495
488
496
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
498
}
492
499
493
500
ret = gnutls_global_init();
494
501
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
497
504
return -1;
498
505
}
499
506
506
513
}
507
514
508
515
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
517
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
513
520
gnutls_global_deinit();
514
521
return -1;
515
522
}
516
523
517
524
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);
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
522
529
}
523
530
524
531
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
532
(mc->cred, pubkeyfilename, seckeyfilename,
526
533
GNUTLS_OPENPGP_FMT_BASE64);
527
534
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));
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));
534
540
goto globalfail;
535
541
}
536
542
537
543
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
544
ret = gnutls_dh_params_init(&mc->dh_params);
539
545
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));
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
543
549
goto globalfail;
544
550
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
552
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));
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
550
555
goto globalfail;
551
556
}
552
557
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
559
555
560
return 0;
556
561
557
562
globalfail:
558
563
559
gnutls_certificate_free_credentials(mc.cred);
564
gnutls_certificate_free_credentials(mc->cred);
560
565
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
566
gnutls_dh_params_deinit(mc->dh_params);
562
567
return -1;
563
568
}
564
569
565
static int init_gnutls_session(gnutls_session_t *session){
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
566
572
int ret;
567
573
/* GnuTLS session creation */
568
574
do {
572
578
}
573
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
580
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));
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
578
584
}
579
585
580
586
{
581
587
const char *err;
582
588
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
590
if(quit_now){
585
591
gnutls_deinit(*session);
586
592
return -1;
587
593
}
588
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
595
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));
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
594
599
gnutls_deinit(*session);
595
600
return -1;
596
601
}
598
603
599
604
do {
600
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
606
mc->cred);
602
607
if(quit_now){
603
608
gnutls_deinit(*session);
604
609
return -1;
605
610
}
606
611
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
612
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
611
615
gnutls_deinit(*session);
612
616
return -1;
613
617
}
615
619
/* ignore client certificate if any. */
616
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
617
621
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
623
620
624
return 0;
621
625
}
625
629
__attribute__((unused)) const char *txt){}
626
630
627
631
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
632
static int start_mandos_communication(const char *ip, in_port_t port,
629
633
AvahiIfIndex if_index,
630
int af){
634
int af, mandos_context *mc){
631
635
int ret, tcp_sd = -1;
632
636
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
637
struct sockaddr_storage to;
637
638
char *buffer = NULL;
638
639
char *decrypted_buffer = NULL;
639
640
size_t buffer_length = 0;
658
659
pf = PF_INET;
659
660
break;
660
661
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
663
errno = EINVAL;
664
664
return -1;
665
665
}
666
666
667
ret = init_gnutls_session(&session);
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
668
700
if(ret != 0){
669
701
return -1;
670
702
}
671
703
672
704
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
676
707
}
677
708
678
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
690
721
691
722
memset(&to, 0, sizeof(to));
692
723
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
695
726
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
698
729
}
699
730
if(ret < 0 ){
700
731
int e = errno;
704
735
}
705
736
if(ret == 0){
706
737
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
739
errno = e;
710
740
goto mandos_end;
711
741
}
712
742
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*/
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
720
746
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");
747
fprintf_plus(stderr, "An IPv6 link-local address is"
748
" incomplete without a network interface\n");
724
749
errno = EINVAL;
725
750
goto mandos_end;
726
751
}
727
752
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
729
754
}
730
755
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
734
757
}
735
758
736
759
if(quit_now){
744
767
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
768
perror_plus("if_indextoname");
746
769
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
750
772
}
751
773
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
754
776
}
755
777
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
778
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
779
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
761
784
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
764
789
}
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
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
772
796
}
773
797
}
774
798
778
802
}
779
803
780
804
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
782
807
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
784
810
}
785
811
if(ret < 0){
786
812
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
827
853
}
828
854
829
855
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
856
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
857
}
833
858
834
859
if(quit_now){
836
861
goto mandos_end;
837
862
}
838
863
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
869
842
870
if(quit_now){
843
871
errno = EINTR;
854
882
855
883
if(ret != GNUTLS_E_SUCCESS){
856
884
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
885
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
886
gnutls_perror(ret);
860
887
}
861
888
errno = EPROTO;
865
892
/* Read OpenPGP packet that contains the wanted password */
866
893
867
894
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
895
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
896
" %s\n", ip);
870
897
}
871
898
872
899
while(true){
910
937
}
911
938
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
939
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
940
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
941
"***\n");
915
942
gnutls_perror(ret);
916
943
errno = EPROTO;
917
944
goto mandos_end;
918
945
}
919
946
break;
920
947
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
948
fprintf_plus(stderr, "Unknown error while reading data from"
949
" encrypted session with Mandos server\n");
924
950
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
951
errno = EIO;
926
952
goto mandos_end;
931
957
}
932
958
933
959
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
960
fprintf_plus(stderr, "Closing TLS session\n");
936
961
}
937
962
938
963
if(quit_now){
951
976
if(buffer_length > 0){
952
977
ssize_t decrypted_buffer_size;
953
978
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
979
&decrypted_buffer, mc);
955
980
if(decrypted_buffer_size >= 0){
956
981
957
982
written = 0;
967
992
if(ret == 0 and ferror(stdout)){
968
993
int e = errno;
969
994
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
995
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
996
strerror(errno));
973
997
}
974
998
errno = e;
975
999
goto mandos_end;
1019
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1045
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
1024
1050
1025
1051
/* Called whenever a service has been resolved successfully or
1026
1052
timed out */
1032
1058
switch(event){
1033
1059
default:
1034
1060
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)));
1061
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1062
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1063
domain,
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
1039
1066
break;
1040
1067
1041
1068
case AVAHI_RESOLVER_FOUND:
1043
1070
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1071
avahi_address_snprint(ip, sizeof(ip), address);
1045
1072
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);
1073
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1074
PRIdMAX ") on port %" PRIu16 "\n", name,
1075
host_name, ip, (intmax_t)interface, port);
1050
1076
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
1053
1081
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1082
avahi_simple_poll_quit(simple_poll);
1055
1083
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1087
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
" list\n", name);
1089
}
1058
1090
}
1059
1091
}
1060
1092
}
1070
1102
const char *domain,
1071
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1104
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
1075
1109
1076
1110
/* Called whenever a new services becomes available on the LAN or
1077
1111
is removed from the LAN */
1084
1118
default:
1085
1119
case AVAHI_BROWSER_FAILURE:
1086
1120
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);
1121
fprintf_plus(stderr, "(Avahi browser) %s\n",
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
1091
1125
return;
1092
1126
1093
1127
case AVAHI_BROWSER_NEW:
1096
1130
the callback function is called the Avahi server will free the
1097
1131
resolver for us. */
1098
1132
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)));
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1137
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1138
" %s\n", name,
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1105
1141
break;
1106
1142
1107
1143
case AVAHI_BROWSER_REMOVE:
1110
1146
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1147
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1148
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1149
fprintf_plus(stderr, "No Mandos server found, still"
1150
" searching...\n");
1115
1151
}
1116
1152
break;
1117
1153
}
1126
1162
signal_received = sig;
1127
1163
int old_errno = errno;
1128
1164
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1131
1167
}
1132
1168
errno = old_errno;
1133
1169
}
1134
1170
1135
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1172
int ret;
1173
error_t ret_errno;
1137
1174
1138
1175
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1176
if(s < 0){
1177
ret_errno = errno;
1140
1178
perror_plus("socket");
1179
errno = ret_errno;
1141
1180
return false;
1142
1181
}
1143
1182
strcpy(ifr->ifr_name, ifname);
1144
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1184
if(ret == -1){
1146
1185
if(debug){
1186
ret_errno = errno;
1147
1187
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1148
1189
}
1149
1190
return false;
1150
1191
}
1156
1197
/* Reject the loopback device */
1157
1198
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1199
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1200
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1201
ifname);
1161
1202
}
1162
1203
return false;
1163
1204
}
1164
1205
/* Accept point-to-point devices only if connect_to is specified */
1165
1206
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1207
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1208
fprintf_plus(stderr, "Accepting point-to-point interface"
1209
" \"%s\"\n", ifname);
1169
1210
}
1170
1211
return true;
1171
1212
}
1172
1213
/* Otherwise, reject non-broadcast-capable devices */
1173
1214
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1215
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1216
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1217
" \"%s\"\n", ifname);
1177
1218
}
1178
1219
return false;
1179
1220
}
1180
1221
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1222
if(ifr->ifr_flags & IFF_NOARP){
1182
1223
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1224
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1225
ifname);
1185
1226
}
1186
1227
return false;
1187
1228
}
1188
1229
1189
1230
/* Accept this device */
1190
1231
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1232
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1233
}
1194
1234
return true;
1195
1235
}
1207
1247
struct ifreq ifr;
1208
1248
if(not get_flags(if_entry->d_name, &ifr)){
1209
1249
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;
1250
fprintf_plus(stderr, "Failed to get flags for interface "
1251
"\"%s\"\n", if_entry->d_name);
1252
}
1253
return 0;
1254
}
1255
1256
if(not good_flags(if_entry->d_name, &ifr)){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/*
1263
* This function determines if a network interface is up.
1264
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1277
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1267
1292
}
1268
1293
1269
1294
int notdotentries(const struct dirent *direntry){
1295
1320
if((direntry->d_name)[sret] != '\0'){
1296
1321
/* Contains non-allowed characters */
1297
1322
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1323
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1324
direntry->d_name);
1301
1325
}
1302
1326
return 0;
1303
1327
}
1319
1343
if(not (S_ISREG(st.st_mode))){
1320
1344
/* Not a regular file */
1321
1345
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1346
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1347
direntry->d_name);
1325
1348
}
1326
1349
return 0;
1327
1350
}
1328
1351
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1352
/* Not executable */
1330
1353
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1355
direntry->d_name);
1334
1356
}
1335
1357
return 0;
1336
1358
}
1359
if(debug){
1360
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1361
direntry->d_name);
1362
}
1337
1363
return 1;
1338
1364
}
1339
1365
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1341
1368
int ret;
1342
1369
struct timespec now;
1343
1370
struct timespec waited_time;
1344
1371
intmax_t block_time;
1345
1372
1346
1373
while(true){
1347
if(mc.current_server == NULL){
1374
if(mc->current_server == NULL){
1348
1375
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1376
fprintf_plus(stderr, "Wait until first server is found."
1377
" No timeout!\n");
1351
1378
}
1352
1379
ret = avahi_simple_poll_iterate(s, -1);
1353
1380
} else {
1354
1381
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1382
fprintf_plus(stderr, "Check current_server if we should run"
1383
" it, or wait\n");
1358
1384
}
1359
1385
/* the current time */
1360
1386
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1391
/* Calculating in ms how long time between now and server
1366
1392
who we visted longest time ago. Now - last seen. */
1367
1393
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1394
- mc->current_server->last_seen.tv_sec);
1369
1395
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1396
- mc->current_server->last_seen.tv_nsec);
1371
1397
/* total time is 10s/10,000ms.
1372
1398
Converting to s from ms by dividing by 1,000,
1373
1399
and ns to ms by dividing by 1,000,000. */
1376
1402
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1403
1378
1404
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1406
block_time);
1381
1407
}
1382
1408
1383
1409
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);
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1388
1414
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1415
avahi_simple_poll_quit(s);
1390
1416
return 0;
1391
1417
}
1392
1418
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1419
&mc->current_server->last_seen);
1394
1420
if(ret == -1){
1395
1421
perror_plus("clock_gettime");
1396
1422
return -1;
1397
1423
}
1398
mc.current_server = mc.current_server->next;
1424
mc->current_server = mc->current_server->next;
1399
1425
block_time = 0; /* Call avahi to find new Mandos
1400
1426
servers, but don't block */
1401
1427
}
1410
1436
}
1411
1437
}
1412
1438
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
1492
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1496
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
1514
perror_plus("asprintf");
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
free(delaystring);
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
1585
} else {
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
1622
}
1623
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
1661
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1792
}
1793
1413
1794
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1414
1799
AvahiSServiceBrowser *sb = NULL;
1415
int error;
1800
error_t ret_errno;
1416
1801
int ret;
1417
1802
intmax_t tmpmax;
1418
1803
char *tmp;
1419
1804
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;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1426
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1427
1808
bool tempdir_created = false;
1428
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
1810
const char *seckey = PATHDIR "/" SECKEY;
1430
1811
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1431
1813
1432
1814
bool gnutls_initialized = false;
1433
1815
bool gpgme_initialized = false;
1495
1877
.group = 2 },
1496
1878
{ .name = "retry", .key = 132,
1497
1879
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1880
.doc = "Retry interval used when denied by the Mandos server",
1499
1881
.group = 2 },
1500
1882
{ .name = "network-hook-dir", .key = 133,
1501
1883
.arg = "DIR",
1524
1906
connect_to = arg;
1525
1907
break;
1526
1908
case 'i': /* --interface */
1527
interface = arg;
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1528
1914
break;
1529
1915
case 's': /* --seckey */
1530
1916
seckey = arg;
1573
1959
argp_state_help(state, state->out_stream,
1574
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
1961
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1578
1963
exit(argp_err_exit_status);
1579
1964
break;
1580
1965
default:
1607
1992
{
1608
1993
/* Work around Debian bug #633582:
1609
1994
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1995
1612
1996
/* 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");
1675
} 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);
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
1763
2078
}
1764
2079
}
1765
2080
1767
2082
avahi_set_log_function(empty_log);
1768
2083
}
1769
2084
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
2085
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
2086
from the signal handler */
1806
2087
/* Initialize the pseudo-RNG for Avahi */
1807
2088
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");
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
2091
fprintf_plus(stderr,
2092
"Avahi: Failed to create simple poll object.\n");
1812
2093
exitcode = EX_UNAVAILABLE;
1813
2094
goto end;
1814
2095
}
1876
2157
}
1877
2158
}
1878
2159
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");
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
2182
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
1965
2207
}
1966
2208
}
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
2209
break;
1985
2210
}
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
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2023
2240
}
2024
2241
2025
2242
if(quit_now){
2026
2243
goto end;
2027
2244
}
2028
2245
2029
ret = init_gnutls_global(pubkey, seckey);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
2247
if(ret == -1){
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2249
exitcode = EX_UNAVAILABLE;
2034
2250
goto end;
2035
2251
} else {
2050
2266
goto end;
2051
2267
}
2052
2268
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2270
fprintf_plus(stderr, "init_gpgme failed\n");
2056
2271
exitcode = EX_UNAVAILABLE;
2057
2272
goto end;
2058
2273
} else {
2067
2282
/* Connect directly, do not use Zeroconf */
2068
2283
/* (Mainly meant for debugging) */
2069
2284
char *address = strrchr(connect_to, ':');
2285
2070
2286
if(address == NULL){
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
2287
fprintf_plus(stderr, "No colon in address\n");
2073
2288
exitcode = EX_USAGE;
2074
2289
goto end;
2075
2290
}
2078
2293
goto end;
2079
2294
}
2080
2295
2081
uint16_t port;
2296
in_port_t port;
2082
2297
errno = 0;
2083
2298
tmpmax = strtoimax(address+1, &tmp, 10);
2084
2299
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");
2300
or tmpmax != (in_port_t)tmpmax){
2301
fprintf_plus(stderr, "Bad port number\n");
2088
2302
exitcode = EX_USAGE;
2089
2303
goto end;
2090
2304
}
2091
2305
2092
2306
if(quit_now){
2093
2307
goto end;
2094
2308
}
2095
2309
2096
port = (uint16_t)tmpmax;
2310
port = (in_port_t)tmpmax;
2097
2311
*address = '\0';
2098
2312
/* Colon in address indicates IPv6 */
2099
2313
int af;
2115
2329
}
2116
2330
2117
2331
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
2119
2334
if(quit_now or ret == 0){
2120
2335
break;
2121
2336
}
2122
2337
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2338
fprintf_plus(stderr, "Retrying in %d seconds\n",
2339
(int)retry_interval);
2125
2340
}
2126
sleep((int)retry_interval);
2341
sleep((unsigned int)retry_interval);
2127
2342
}
2128
2343
2129
2344
if (not quit_now){
2147
2362
config.publish_domain = 0;
2148
2363
2149
2364
/* Allocate a new server */
2150
mc.server = avahi_server_new(avahi_simple_poll_get
2151
(mc.simple_poll), &config, NULL,
2152
NULL, &error);
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
2153
2367
2154
2368
/* Free the Avahi configuration data */
2155
2369
avahi_server_config_free(&config);
2157
2371
2158
2372
/* Check if creating the Avahi server object succeeded */
2159
2373
if(mc.server == NULL){
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
2162
avahi_strerror(error));
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
2163
2376
exitcode = EX_UNAVAILABLE;
2164
2377
goto end;
2165
2378
}
2171
2384
/* Create the Avahi service browser */
2172
2385
sb = avahi_s_service_browser_new(mc.server, if_index,
2173
2386
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2174
NULL, 0, browse_callback, NULL);
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
2175
2389
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)));
2390
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
avahi_strerror(avahi_server_errno(mc.server)));
2179
2392
exitcode = EX_UNAVAILABLE;
2180
2393
goto end;
2181
2394
}
2187
2400
/* Run the main loop */
2188
2401
2189
2402
if(debug){
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2192
2404
}
2193
2405
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
2196
2408
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2409
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2410
(ret == 0) ? "successfully" : "with error");
2200
2411
}
2201
2412
2202
2413
end:
2203
2414
2204
2415
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2207
2417
}
2208
2418
2209
2419
/* Cleanup things */
2420
free(mc.interfaces);
2421
2210
2422
if(sb != NULL)
2211
2423
avahi_s_service_browser_free(sb);
2212
2424
2213
2425
if(mc.server != NULL)
2214
2426
avahi_server_free(mc.server);
2215
2427
2216
if(mc.simple_poll != NULL)
2217
avahi_simple_poll_free(mc.simple_poll);
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
2218
2430
2219
2431
if(gnutls_initialized){
2220
2432
gnutls_certificate_free_credentials(mc.cred);
2225
2437
if(gpgme_initialized){
2226
2438
gpgme_release(mc.ctx);
2227
2439
}
2228
2440
2229
2441
/* Cleans up the circular linked list of Mandos servers the client
2230
2442
has seen */
2231
2443
if(mc.current_server != NULL){
2237
2449
}
2238
2450
}
2239
2451
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");
2249
}
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");
2452
/* Re-raise priviliges */
2453
{
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2259
2470
}
2260
2471
}
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");
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2270
2475
}
2271
2476
}
2477
2478
lower_privileges_permanently();
2272
2479
}
2273
2480
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2483
2274
2484
/* Removes the GPGME temp directory and all files inside */
2275
2485
if(tempdir_created){
2276
2486
struct dirent **direntries = NULL;
2289
2499
}
2290
2500
ret = remove(fullname);
2291
2501
if(ret == -1){
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
2294
2504
}
2295
2505
free(fullname);
2296
2506
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0