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- Committer: Teddy Hogeborn
- Date: 2012-06-17 02:30:59 UTC
- Revision ID: teddy@recompile.se-20120617023059-em4nfnxg1tsn64xj
* plugins.d/mandos-client (start_mandos_communication): Bug fix; skip
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
75
setgid(), pause(), _exit() */
77
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
88
94
89
95
#ifdef __linux__
90
96
#include <sys/klog.h> /* klogctl() */
108
114
init_gnutls_session(),
109
115
GNUTLS_* */
110
116
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
113
119
114
120
/* GPGME */
115
121
#include <gpgme.h> /* All GPGME types, constants and
123
129
#define PATHDIR "/conf/conf.d/mandos"
124
130
#define SECKEY "seckey.txt"
125
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
133
127
134
bool debug = false;
128
135
static const char mandos_protocol_version[] = "1";
130
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
138
static const char sys_class_net[] = "/sys/class/net";
132
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
133
143
134
144
/* Doubly linked list that need to be circularly linked when used */
135
145
typedef struct server{
136
146
const char *ip;
137
uint16_t port;
147
in_port_t port;
138
148
AvahiIfIndex if_index;
139
149
int af;
140
150
struct timespec last_seen;
144
154
145
155
/* Used for passing in values through the Avahi callback functions */
146
156
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
157
AvahiServer *server;
149
158
gnutls_certificate_credentials_t cred;
150
159
unsigned int dh_bits;
152
161
const char *priority;
153
162
gpgme_ctx_t ctx;
154
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
155
166
} mandos_context;
156
167
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
162
170
163
171
sig_atomic_t quit_now = 0;
164
172
int signal_received = 0;
165
173
166
174
/* Function to use when printing errors */
167
175
void perror_plus(const char *print_text){
176
int e = errno;
168
177
fprintf(stderr, "Mandos plugin %s: ",
169
178
program_invocation_short_name);
179
errno = e;
170
180
perror(print_text);
171
181
}
172
182
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
173
193
/*
174
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
195
* bytes. "buffer_capacity" is how much is currently allocated,
176
196
* "buffer_length" is how much is already used.
177
197
*/
178
198
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
199
size_t buffer_capacity){
180
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
202
if(buffer == NULL){
188
208
}
189
209
190
210
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
194
213
int ret;
195
214
server *new_server = malloc(sizeof(server));
196
215
if(new_server == NULL){
197
216
perror_plus("malloc");
198
return -1;
217
return false;
199
218
}
200
219
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
220
.port = port,
221
.if_index = if_index,
222
.af = af };
204
223
if(new_server->ip == NULL){
205
224
perror_plus("strdup");
206
return -1;
225
return false;
207
226
}
208
227
/* Special case of first server */
209
if (mc.current_server == NULL){
228
if(*current_server == NULL){
210
229
new_server->next = new_server;
211
230
new_server->prev = new_server;
212
mc.current_server = new_server;
231
*current_server = new_server;
213
232
/* Place the new server last in the list */
214
233
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
217
236
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
237
(*current_server)->prev = new_server;
219
238
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
221
240
if(ret == -1){
222
241
perror_plus("clock_gettime");
223
return -1;
242
return false;
224
243
}
225
return 0;
244
return true;
226
245
}
227
246
228
247
/*
229
248
* Initialize GPGME.
230
249
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
233
252
gpgme_error_t rc;
234
253
gpgme_engine_info_t engine_info;
235
254
236
237
255
/*
238
256
* Helper function to insert pub and seckey to the engine keyring.
239
257
*/
250
268
251
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
270
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
255
273
return false;
256
274
}
257
275
258
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
259
277
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
262
280
return false;
263
281
}
264
282
271
289
}
272
290
273
291
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
275
293
}
276
294
277
295
/* Init GPGME */
278
296
gpgme_check_version(NULL);
279
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
298
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
283
301
return false;
284
302
}
285
303
286
304
/* Set GPGME home directory for the OpenPGP engine only */
287
305
rc = gpgme_get_engine_info(&engine_info);
288
306
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
291
309
return false;
292
310
}
293
311
while(engine_info != NULL){
299
317
engine_info = engine_info->next;
300
318
}
301
319
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
303
322
return false;
304
323
}
305
324
306
325
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
308
327
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
311
331
return false;
312
332
}
313
333
324
344
*/
325
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
346
size_t crypto_size,
327
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
328
349
gpgme_data_t dh_crypto, dh_plain;
329
350
gpgme_error_t rc;
330
351
ssize_t ret;
332
353
ssize_t plaintext_length = 0;
333
354
334
355
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
357
}
337
358
338
359
/* Create new GPGME data buffer from memory cryptotext */
339
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
361
0);
341
362
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
344
365
return -1;
345
366
}
346
367
347
368
/* Create new empty GPGME data buffer for the plaintext */
348
369
rc = gpgme_data_new(&dh_plain);
349
370
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
352
374
gpgme_data_release(dh_crypto);
353
375
return -1;
354
376
}
355
377
356
378
/* Decrypt data from the cryptotext data buffer to the plaintext
357
379
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
381
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
362
384
plaintext_length = -1;
363
385
if(debug){
364
386
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
366
388
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
390
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
373
395
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
397
}
376
398
gpgme_recipient_t recipient;
377
399
recipient = result->recipients;
378
400
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
385
408
recipient = recipient->next;
386
409
}
387
410
}
390
413
}
391
414
392
415
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
417
}
395
418
396
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
426
*plaintext = NULL;
404
427
while(true){
405
428
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
429
(size_t)plaintext_length,
430
plaintext_capacity);
408
431
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
412
435
}
413
436
414
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
450
}
428
451
429
452
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
431
454
for(ssize_t i = 0; i < plaintext_length; i++){
432
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
456
}
445
468
}
446
469
447
470
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
450
472
if(ret == NULL)
451
473
ret = "(unknown)";
452
474
return ret;
455
477
/* GnuTLS log function callback */
456
478
static void debuggnutls(__attribute__((unused)) int level,
457
479
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
459
481
}
460
482
461
483
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
463
486
int ret;
464
487
465
488
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
490
}
468
491
469
492
ret = gnutls_global_init();
470
493
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
473
496
return -1;
474
497
}
475
498
482
505
}
483
506
484
507
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
509
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
489
512
gnutls_global_deinit();
490
513
return -1;
491
514
}
492
515
493
516
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
497
521
}
498
522
499
523
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
501
525
GNUTLS_OPENPGP_FMT_BASE64);
502
526
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
508
532
goto globalfail;
509
533
}
510
534
511
535
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
513
537
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
516
541
goto globalfail;
517
542
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
544
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
522
547
goto globalfail;
523
548
}
524
549
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
551
527
552
return 0;
528
553
529
554
globalfail:
530
555
531
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
532
557
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
534
559
return -1;
535
560
}
536
561
537
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
538
564
int ret;
539
565
/* GnuTLS session creation */
540
566
do {
544
570
}
545
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
572
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
549
576
}
550
577
551
578
{
552
579
const char *err;
553
580
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
582
if(quit_now){
556
583
gnutls_deinit(*session);
557
584
return -1;
558
585
}
559
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
587
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
564
591
gnutls_deinit(*session);
565
592
return -1;
566
593
}
568
595
569
596
do {
570
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
598
mc->cred);
572
599
if(quit_now){
573
600
gnutls_deinit(*session);
574
601
return -1;
575
602
}
576
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
604
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
580
607
gnutls_deinit(*session);
581
608
return -1;
582
609
}
584
611
/* ignore client certificate if any. */
585
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
586
613
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
615
589
616
return 0;
590
617
}
594
621
__attribute__((unused)) const char *txt){}
595
622
596
623
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
598
625
AvahiIfIndex if_index,
599
int af){
626
int af, mandos_context *mc){
600
627
int ret, tcp_sd = -1;
601
628
ssize_t sret;
602
629
union {
627
654
pf = PF_INET;
628
655
break;
629
656
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
658
errno = EINVAL;
632
659
return -1;
633
660
}
634
661
635
ret = init_gnutls_session(&session);
662
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
663
/* Check if the interface is one of the interfaces we are using */
664
bool match = false;
665
{
666
char *interface = NULL;
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
669
if(if_nametoindex(interface) == (unsigned int)if_index){
670
match = true;
671
break;
672
}
673
}
674
}
675
if(not match){
676
if(debug){
677
char interface[IF_NAMESIZE];
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
679
perror_plus("if_indextoname");
680
} else {
681
fprintf_plus(stderr, "Skipping server on non-used interface"
682
" \"%s\"\n",
683
if_indextoname((unsigned int)if_index,
684
interface));
685
}
686
}
687
return -1;
688
}
689
}
690
691
ret = init_gnutls_session(&session, mc);
636
692
if(ret != 0){
637
693
return -1;
638
694
}
639
695
640
696
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
697
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
698
PRIuMAX "\n", ip, (uintmax_t)port);
643
699
}
644
700
645
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
727
}
672
728
if(ret == 0){
673
729
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
730
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
731
errno = e;
676
732
goto mandos_end;
677
733
}
678
734
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
735
to.in6.sin6_port = htons(port);
683
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
738
-Wunreachable-code*/
686
739
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
740
fprintf_plus(stderr, "An IPv6 link-local address is"
741
" incomplete without a network interface\n");
689
742
errno = EINVAL;
690
743
goto mandos_end;
691
744
}
709
762
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
763
perror_plus("if_indextoname");
711
764
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
765
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
766
"\n", ip, interface, (uintmax_t)port);
714
767
}
715
768
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
769
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
770
ip, (uintmax_t)port);
718
771
}
719
772
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
773
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
783
perror_plus("inet_ntop");
731
784
} else {
732
785
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
786
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
787
}
735
788
}
736
789
}
764
817
while(true){
765
818
size_t out_size = strlen(out);
766
819
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
820
out_size - written));
768
821
if(ret == -1){
769
822
int e = errno;
770
823
perror_plus("write");
790
843
}
791
844
792
845
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
846
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
847
}
795
848
796
849
if(quit_now){
798
851
goto mandos_end;
799
852
}
800
853
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
854
/* This casting via intptr_t is to eliminate warning about casting
855
an int to a pointer type. This is exactly how the GnuTLS Guile
856
function "set-session-transport-fd!" does it. */
857
gnutls_transport_set_ptr(session,
858
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
803
859
804
860
if(quit_now){
805
861
errno = EINTR;
816
872
817
873
if(ret != GNUTLS_E_SUCCESS){
818
874
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
875
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
876
gnutls_perror(ret);
821
877
}
822
878
errno = EPROTO;
826
882
/* Read OpenPGP packet that contains the wanted password */
827
883
828
884
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
885
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
886
" %s\n", ip);
831
887
}
832
888
833
889
while(true){
838
894
}
839
895
840
896
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
897
buffer_capacity);
842
898
if(buffer_capacity == 0){
843
899
int e = errno;
844
900
perror_plus("incbuffer");
871
927
}
872
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
929
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
930
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
931
"***\n");
875
932
gnutls_perror(ret);
876
933
errno = EPROTO;
877
934
goto mandos_end;
878
935
}
879
936
break;
880
937
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
938
fprintf_plus(stderr, "Unknown error while reading data from"
939
" encrypted session with Mandos server\n");
883
940
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
941
errno = EIO;
885
942
goto mandos_end;
890
947
}
891
948
892
949
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
950
fprintf_plus(stderr, "Closing TLS session\n");
894
951
}
895
952
896
953
if(quit_now){
908
965
909
966
if(buffer_length > 0){
910
967
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
968
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
969
&decrypted_buffer, mc);
914
970
if(decrypted_buffer_size >= 0){
915
971
916
972
written = 0;
926
982
if(ret == 0 and ferror(stdout)){
927
983
int e = errno;
928
984
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
985
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
986
strerror(errno));
931
987
}
932
988
errno = e;
933
989
goto mandos_end;
977
1033
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
1034
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1035
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1036
void* mc){
1037
if(r == NULL){
1038
return;
1039
}
982
1040
983
1041
/* Called whenever a service has been resolved successfully or
984
1042
timed out */
990
1048
switch(event){
991
1049
default:
992
1050
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1051
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1052
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1053
domain,
1054
avahi_strerror(avahi_server_errno
1055
(((mandos_context*)mc)->server)));
996
1056
break;
997
1057
998
1058
case AVAHI_RESOLVER_FOUND:
1000
1060
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1061
avahi_address_snprint(ip, sizeof(ip), address);
1002
1062
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1063
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1064
PRIdMAX ") on port %" PRIu16 "\n", name,
1065
host_name, ip, (intmax_t)interface, port);
1006
1066
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1067
int ret = start_mandos_communication(ip, (in_port_t)port,
1068
interface,
1069
avahi_proto_to_af(proto),
1070
mc);
1009
1071
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1072
avahi_simple_poll_quit(simple_poll);
1011
1073
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1074
if(not add_server(ip, (in_port_t)port, interface,
1075
avahi_proto_to_af(proto),
1076
&((mandos_context*)mc)->current_server)){
1077
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1078
" list\n", name);
1079
}
1014
1080
}
1015
1081
}
1016
1082
}
1026
1092
const char *domain,
1027
1093
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1094
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1095
void* mc){
1096
if(b == NULL){
1097
return;
1098
}
1031
1099
1032
1100
/* Called whenever a new services becomes available on the LAN or
1033
1101
is removed from the LAN */
1040
1108
default:
1041
1109
case AVAHI_BROWSER_FAILURE:
1042
1110
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1111
fprintf_plus(stderr, "(Avahi browser) %s\n",
1112
avahi_strerror(avahi_server_errno
1113
(((mandos_context*)mc)->server)));
1114
avahi_simple_poll_quit(simple_poll);
1046
1115
return;
1047
1116
1048
1117
case AVAHI_BROWSER_NEW:
1051
1120
the callback function is called the Avahi server will free the
1052
1121
resolver for us. */
1053
1122
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1123
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1124
interface, protocol, name, type,
1125
domain, protocol, 0,
1126
resolve_callback, mc) == NULL)
1127
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1128
" %s\n", name,
1129
avahi_strerror(avahi_server_errno
1130
(((mandos_context*)mc)->server)));
1059
1131
break;
1060
1132
1061
1133
case AVAHI_BROWSER_REMOVE:
1064
1136
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1137
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1138
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1139
fprintf_plus(stderr, "No Mandos server found, still"
1140
" searching...\n");
1068
1141
}
1069
1142
break;
1070
1143
}
1079
1152
signal_received = sig;
1080
1153
int old_errno = errno;
1081
1154
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1155
if(simple_poll != NULL){
1156
avahi_simple_poll_quit(simple_poll);
1084
1157
}
1085
1158
errno = old_errno;
1086
1159
}
1087
1160
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1162
int ret;
1163
error_t ret_errno;
1164
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1166
if(s < 0){
1167
ret_errno = errno;
1168
perror_plus("socket");
1169
errno = ret_errno;
1170
return false;
1171
}
1172
strcpy(ifr->ifr_name, ifname);
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1174
if(ret == -1){
1175
if(debug){
1176
ret_errno = errno;
1177
perror_plus("ioctl SIOCGIFFLAGS");
1178
errno = ret_errno;
1179
}
1180
return false;
1181
}
1182
return true;
1183
}
1184
1185
bool good_flags(const char *ifname, const struct ifreq *ifr){
1186
1187
/* Reject the loopback device */
1188
if(ifr->ifr_flags & IFF_LOOPBACK){
1189
if(debug){
1190
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1191
ifname);
1192
}
1193
return false;
1194
}
1195
/* Accept point-to-point devices only if connect_to is specified */
1196
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1197
if(debug){
1198
fprintf_plus(stderr, "Accepting point-to-point interface"
1199
" \"%s\"\n", ifname);
1200
}
1201
return true;
1202
}
1203
/* Otherwise, reject non-broadcast-capable devices */
1204
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1205
if(debug){
1206
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1207
" \"%s\"\n", ifname);
1208
}
1209
return false;
1210
}
1211
/* Reject non-ARP interfaces (including dummy interfaces) */
1212
if(ifr->ifr_flags & IFF_NOARP){
1213
if(debug){
1214
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1215
ifname);
1216
}
1217
return false;
1218
}
1219
1220
/* Accept this device */
1221
if(debug){
1222
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1223
}
1224
return true;
1225
}
1226
1088
1227
/*
1089
1228
* This function determines if a directory entry in /sys/class/net
1090
1229
* corresponds to an acceptable network device.
1091
1230
* (This function is passed to scandir(3) as a filter function.)
1092
1231
*/
1093
1232
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1233
if(if_entry->d_name[0] == '.'){
1097
1234
return 0;
1098
1235
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1236
1237
struct ifreq ifr;
1238
if(not get_flags(if_entry->d_name, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", if_entry->d_name);
1242
}
1243
return 0;
1244
}
1245
1246
if(not good_flags(if_entry->d_name, &ifr)){
1247
return 0;
1189
1248
}
1190
1249
return 1;
1191
1250
}
1192
1251
1252
/*
1253
* This function determines if a network interface is up.
1254
*/
1255
bool interface_is_up(const char *interface){
1256
struct ifreq ifr;
1257
if(not get_flags(interface, &ifr)){
1258
if(debug){
1259
fprintf_plus(stderr, "Failed to get flags for interface "
1260
"\"%s\"\n", interface);
1261
}
1262
return false;
1263
}
1264
1265
return (bool)(ifr.ifr_flags & IFF_UP);
1266
}
1267
1268
/*
1269
* This function determines if a network interface is running
1270
*/
1271
bool interface_is_running(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_RUNNING);
1282
}
1283
1193
1284
int notdotentries(const struct dirent *direntry){
1194
1285
/* Skip "." and ".." */
1195
1286
if(direntry->d_name[0] == '.'
1201
1292
return 1;
1202
1293
}
1203
1294
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1295
/* Is this directory entry a runnable program? */
1296
int runnable_hook(const struct dirent *direntry){
1297
int ret;
1298
size_t sret;
1299
struct stat st;
1300
1301
if((direntry->d_name)[0] == '\0'){
1302
/* Empty name? */
1303
return 0;
1304
}
1305
1306
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1307
"abcdefghijklmnopqrstuvwxyz"
1308
"0123456789"
1309
"_-");
1310
if((direntry->d_name)[sret] != '\0'){
1311
/* Contains non-allowed characters */
1312
if(debug){
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1314
direntry->d_name);
1315
}
1316
return 0;
1317
}
1318
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1321
if(ret < 0){
1322
perror_plus("asprintf");
1323
return 0;
1324
}
1325
1326
ret = stat(fullname, &st);
1327
if(ret == -1){
1328
if(debug){
1329
perror_plus("Could not stat hook");
1330
}
1331
return 0;
1332
}
1333
if(not (S_ISREG(st.st_mode))){
1334
/* Not a regular file */
1335
if(debug){
1336
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1337
direntry->d_name);
1338
}
1339
return 0;
1340
}
1341
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1342
/* Not executable */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
if(debug){
1350
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1351
direntry->d_name);
1352
}
1353
return 1;
1354
}
1355
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1357
mandos_context *mc){
1205
1358
int ret;
1206
1359
struct timespec now;
1207
1360
struct timespec waited_time;
1208
1361
intmax_t block_time;
1209
1362
1210
1363
while(true){
1211
if(mc.current_server == NULL){
1364
if(mc->current_server == NULL){
1212
1365
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1366
fprintf_plus(stderr, "Wait until first server is found."
1367
" No timeout!\n");
1215
1368
}
1216
1369
ret = avahi_simple_poll_iterate(s, -1);
1217
1370
} else {
1218
1371
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1372
fprintf_plus(stderr, "Check current_server if we should run"
1373
" it, or wait\n");
1221
1374
}
1222
1375
/* the current time */
1223
1376
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1228
1381
/* Calculating in ms how long time between now and server
1229
1382
who we visted longest time ago. Now - last seen. */
1230
1383
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1384
- mc->current_server->last_seen.tv_sec);
1232
1385
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1386
- mc->current_server->last_seen.tv_nsec);
1234
1387
/* total time is 10s/10,000ms.
1235
1388
Converting to s from ms by dividing by 1,000,
1236
1389
and ns to ms by dividing by 1,000,000. */
1239
1392
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1393
1241
1394
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1395
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1396
block_time);
1243
1397
}
1244
1398
1245
1399
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1400
ret = start_mandos_communication(mc->current_server->ip,
1401
mc->current_server->port,
1402
mc->current_server->if_index,
1403
mc->current_server->af, mc);
1250
1404
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1405
avahi_simple_poll_quit(s);
1252
1406
return 0;
1253
1407
}
1254
1408
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1409
&mc->current_server->last_seen);
1256
1410
if(ret == -1){
1257
1411
perror_plus("clock_gettime");
1258
1412
return -1;
1259
1413
}
1260
mc.current_server = mc.current_server->next;
1414
mc->current_server = mc->current_server->next;
1261
1415
block_time = 0; /* Call avahi to find new Mandos
1262
1416
servers, but don't block */
1263
1417
}
1265
1419
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1420
}
1267
1421
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1422
if (ret > 0 or errno != EINTR){
1269
1423
return (ret != 1) ? ret : 0;
1270
1424
}
1271
1425
}
1272
1426
}
1273
1427
}
1274
1428
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
bool run_network_hooks(const char *mode, const char *interface,
1482
const float delay){
1483
struct dirent **direntries;
1484
struct dirent *direntry;
1485
int ret;
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1487
alphasort);
1488
if(numhooks == -1){
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
1496
}
1497
} else {
1498
int devnull = open("/dev/null", O_RDONLY);
1499
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1501
char *fullname = NULL;
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1503
if(ret < 0){
1504
perror_plus("asprintf");
1505
continue;
1506
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1511
pid_t hook_pid = fork();
1512
if(hook_pid == 0){
1513
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1528
dup2(devnull, STDIN_FILENO);
1529
close(devnull);
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1532
if(ret == -1){
1533
perror_plus("setenv");
1534
_exit(EX_OSERR);
1535
}
1536
ret = setenv("DEVICE", interface, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("MODE", mode, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
char *delaystring;
1552
ret = asprintf(&delaystring, "%f", delay);
1553
if(ret == -1){
1554
perror_plus("asprintf");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("DELAY", delaystring, 1);
1558
if(ret == -1){
1559
free(delaystring);
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
free(delaystring);
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
1575
} else {
1576
int status;
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1578
perror_plus("waitpid");
1579
free(fullname);
1580
continue;
1581
}
1582
if(WIFEXITED(status)){
1583
if(WEXITSTATUS(status) != 0){
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1587
free(fullname);
1588
continue;
1589
}
1590
} else if(WIFSIGNALED(status)){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1593
WTERMSIG(status));
1594
free(fullname);
1595
continue;
1596
} else {
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1599
free(fullname);
1600
continue;
1601
}
1602
}
1603
free(fullname);
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1607
}
1608
}
1609
close(devnull);
1610
}
1611
return true;
1612
}
1613
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
1620
struct ifreq network;
1621
unsigned int if_index = if_nametoindex(interface);
1622
if(if_index == 0){
1623
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1624
errno = old_errno;
1625
return ENXIO;
1626
}
1627
1628
if(quit_now){
1629
errno = old_errno;
1630
return EINTR;
1631
}
1632
1633
if(not interface_is_up(interface)){
1634
if(not get_flags(interface, &network) and debug){
1635
ret_errno = errno;
1636
fprintf_plus(stderr, "Failed to get flags for interface "
1637
"\"%s\"\n", interface);
1638
return ret_errno;
1639
}
1640
network.ifr_flags |= IFF_UP;
1641
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
1644
ret_errno = errno;
1645
perror_plus("socket");
1646
errno = old_errno;
1647
return ret_errno;
1648
}
1649
1650
if(quit_now){
1651
close(sd);
1652
errno = old_errno;
1653
return EINTR;
1654
}
1655
1656
if(debug){
1657
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1658
interface);
1659
}
1660
1661
/* Raise priviliges */
1662
raise_privileges();
1663
1664
#ifdef __linux__
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
1672
}
1673
#endif /* __linux__ */
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
1676
#ifdef __linux__
1677
if(restore_loglevel){
1678
ret_linux = klogctl(7, NULL, 0);
1679
if(ret_linux == -1){
1680
perror_plus("klogctl");
1681
}
1682
}
1683
#endif /* __linux__ */
1684
1685
/* Lower privileges */
1686
lower_privileges();
1687
1688
/* Close the socket */
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1690
if(ret == -1){
1691
perror_plus("close");
1692
}
1693
1694
if(ret_setflags == -1){
1695
errno = ret_errno;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
errno = old_errno;
1698
return ret_errno;
1699
}
1700
} else if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1702
interface);
1703
}
1704
1705
/* Sleep checking until interface is running.
1706
Check every 0.25s, up to total time of delay */
1707
for(int i=0; i < delay * 4; i++){
1708
if(interface_is_running(interface)){
1709
break;
1710
}
1711
struct timespec sleeptime = { .tv_nsec = 250000000 };
1712
ret = nanosleep(&sleeptime, NULL);
1713
if(ret == -1 and errno != EINTR){
1714
perror_plus("nanosleep");
1715
}
1716
}
1717
1718
errno = old_errno;
1719
return 0;
1720
}
1721
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
1727
struct ifreq network;
1728
unsigned int if_index = if_nametoindex(interface);
1729
if(if_index == 0){
1730
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1731
errno = old_errno;
1732
return ENXIO;
1733
}
1734
if(interface_is_up(interface)){
1735
if(not get_flags(interface, &network) and debug){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
return ret_errno;
1740
}
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1742
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
1745
ret_errno = errno;
1746
perror_plus("socket");
1747
errno = old_errno;
1748
return ret_errno;
1749
}
1750
1751
if(debug){
1752
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1753
interface);
1754
}
1755
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
1764
1765
/* Close the socket */
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1767
if(ret == -1){
1768
perror_plus("close");
1769
}
1770
1771
if(ret_setflags == -1){
1772
errno = ret_errno;
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1774
errno = old_errno;
1775
return ret_errno;
1776
}
1777
} else if(debug){
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1779
interface);
1780
}
1781
1782
errno = old_errno;
1783
return 0;
1784
}
1785
1275
1786
int main(int argc, char *argv[]){
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
1276
1791
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1792
error_t ret_errno;
1278
1793
int ret;
1279
1794
intmax_t tmpmax;
1280
1795
char *tmp;
1281
1796
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1797
char *interfaces_to_take_down = NULL;
1798
size_t interfaces_to_take_down_size = 0;
1288
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1289
1800
bool tempdir_created = false;
1290
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
1802
const char *seckey = PATHDIR "/" SECKEY;
1292
1803
const char *pubkey = PATHDIR "/" PUBKEY;
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
1293
1806
1294
1807
bool gnutls_initialized = false;
1295
1808
bool gpgme_initialized = false;
1357
1870
.group = 2 },
1358
1871
{ .name = "retry", .key = 132,
1359
1872
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1873
.doc = "Retry interval used when denied by the Mandos server",
1874
.group = 2 },
1875
{ .name = "network-hook-dir", .key = 133,
1876
.arg = "DIR",
1877
.doc = "Directory where network hooks are located",
1361
1878
.group = 2 },
1362
1879
/*
1363
1880
* These reproduce what we would get without ARGP_NO_HELP
1382
1899
connect_to = arg;
1383
1900
break;
1384
1901
case 'i': /* --interface */
1385
interface = arg;
1902
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1903
arg, (int)',');
1904
if(ret_errno != 0){
1905
argp_error(state, "%s", strerror(ret_errno));
1906
}
1386
1907
break;
1387
1908
case 's': /* --seckey */
1388
1909
seckey = arg;
1417
1938
argp_error(state, "Bad retry interval");
1418
1939
}
1419
1940
break;
1941
case 133: /* --network-hook-dir */
1942
hookdir = arg;
1943
break;
1420
1944
/*
1421
1945
* These reproduce what we would get without ARGP_NO_HELP
1422
1946
*/
1428
1952
argp_state_help(state, state->out_stream,
1429
1953
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1954
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1955
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1956
exit(argp_err_exit_status);
1433
1957
break;
1434
1958
default:
1461
1985
{
1462
1986
/* Work around Debian bug #633582:
1463
1987
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1988
1466
1989
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1990
if(raise_privileges() == 0){
1991
struct stat st;
1992
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1994
int seckey_fd = open(seckey, O_RDONLY);
1995
if(seckey_fd == -1){
1996
perror_plus("open");
1997
} else {
1998
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1999
if(ret == -1){
2000
perror_plus("fstat");
2001
} else {
2002
if(S_ISREG(st.st_mode)
2003
and st.st_uid == 0 and st.st_gid == 0){
2004
ret = fchown(seckey_fd, uid, gid);
2005
if(ret == -1){
2006
perror_plus("fchown");
2007
}
2008
}
2009
}
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2011
}
2012
}
2013
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2016
if(pubkey_fd == -1){
2017
perror_plus("open");
2018
} else {
2019
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2020
if(ret == -1){
2021
perror_plus("fstat");
2022
} else {
2023
if(S_ISREG(st.st_mode)
2024
and st.st_uid == 0 and st.st_gid == 0){
2025
ret = fchown(pubkey_fd, uid, gid);
2026
if(ret == -1){
2027
perror_plus("fchown");
2028
}
2029
}
2030
}
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2035
/* Lower privileges */
2036
lower_privileges();
2037
}
2038
}
2039
2040
/* Remove invalid interface names (except "none") */
2041
{
2042
char *interface = NULL;
2043
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2044
interface))){
2045
if(strcmp(interface, "none") != 0
2046
and if_nametoindex(interface) == 0){
2047
if(interface[0] != '\0'){
2048
fprintf_plus(stderr, "Not using nonexisting interface"
2049
" \"%s\"\n", interface);
2050
}
2051
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2052
interface = NULL;
2053
}
2054
}
2055
}
2056
2057
/* Run network hooks */
2058
{
2059
if(mc.interfaces != NULL){
2060
interfaces_hooks = malloc(mc.interfaces_size);
2061
if(interfaces_hooks == NULL){
2062
perror_plus("malloc");
2063
goto end;
2064
}
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
2069
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2072
goto end;
1518
2073
}
1519
2074
}
1520
2075
1521
2076
if(not debug){
1522
2077
avahi_set_log_function(empty_log);
1523
2078
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
2079
1550
2080
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2081
from the signal handler */
1552
2082
/* Initialize the pseudo-RNG for Avahi */
1553
2083
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2084
simple_poll = avahi_simple_poll_new();
2085
if(simple_poll == NULL){
2086
fprintf_plus(stderr,
2087
"Avahi: Failed to create simple poll object.\n");
1557
2088
exitcode = EX_UNAVAILABLE;
1558
2089
goto end;
1559
2090
}
1621
2152
}
1622
2153
}
1623
2154
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
2155
/* If no interfaces were specified, make a list */
2156
if(mc.interfaces == NULL){
2157
struct dirent **direntries;
2158
/* Look for any good interfaces */
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2160
alphasort);
2161
if(ret >= 1){
2162
/* Add all found interfaces to interfaces list */
2163
for(int i = 0; i < ret; ++i){
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2165
direntries[i]->d_name);
2166
if(ret_errno != 0){
2167
perror_plus("argz_add");
2168
continue;
2169
}
2170
if(debug){
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2172
direntries[i]->d_name);
2173
}
2174
}
2175
free(direntries);
2176
} else {
2177
free(direntries);
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2179
exitcode = EXIT_FAILURE;
2180
goto end;
2181
}
2182
}
2183
2184
/* Bring up interfaces which are down */
2185
{
2186
char *interface = NULL;
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2188
interface))){
2189
/* If interface name is "none", stop bringing up interfaces.
2190
Also remove all instances of "none" from the list */
2191
if(strcmp(interface, "none") == 0){
2192
argz_delete(&mc.interfaces, &mc.interfaces_size,
2193
interface);
2194
interface = NULL;
2195
while((interface = argz_next(mc.interfaces,
2196
mc.interfaces_size, interface))){
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
1709
2201
}
1710
2202
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
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
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
2203
break;
1729
2204
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
2205
bool interface_was_up = interface_is_up(interface);
2206
ret = bring_up_interface(interface, delay);
2207
if(not interface_was_up){
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2211
} else {
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2215
}
2216
}
2217
}
2218
if(debug and (interfaces_to_take_down == NULL)){
2219
fprintf_plus(stderr, "No interfaces were brought up\n");
2220
}
2221
}
2222
2223
/* If we only got one interface, explicitly use only that one */
2224
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2225
if(debug){
2226
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2227
mc.interfaces);
2228
}
2229
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1767
2230
}
1768
2231
1769
2232
if(quit_now){
1770
2233
goto end;
1771
2234
}
1772
2235
1773
ret = init_gnutls_global(pubkey, seckey);
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
1774
2237
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2239
exitcode = EX_UNAVAILABLE;
1777
2240
goto end;
1778
2241
} else {
1793
2256
goto end;
1794
2257
}
1795
2258
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2259
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2260
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2261
exitcode = EX_UNAVAILABLE;
1799
2262
goto end;
1800
2263
} else {
1809
2272
/* Connect directly, do not use Zeroconf */
1810
2273
/* (Mainly meant for debugging) */
1811
2274
char *address = strrchr(connect_to, ':');
2275
1812
2276
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2277
fprintf_plus(stderr, "No colon in address\n");
1814
2278
exitcode = EX_USAGE;
1815
2279
goto end;
1816
2280
}
1819
2283
goto end;
1820
2284
}
1821
2285
1822
uint16_t port;
2286
in_port_t port;
1823
2287
errno = 0;
1824
2288
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2289
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2290
or tmpmax != (in_port_t)tmpmax){
2291
fprintf_plus(stderr, "Bad port number\n");
1828
2292
exitcode = EX_USAGE;
1829
2293
goto end;
1830
2294
}
1831
2295
1832
2296
if(quit_now){
1833
2297
goto end;
1834
2298
}
1835
2299
1836
port = (uint16_t)tmpmax;
2300
port = (in_port_t)tmpmax;
1837
2301
*address = '\0';
1838
2302
/* Colon in address indicates IPv6 */
1839
2303
int af;
1855
2319
}
1856
2320
1857
2321
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
2322
ret = start_mandos_communication(address, port, if_index, af,
2323
&mc);
1859
2324
if(quit_now or ret == 0){
1860
2325
break;
1861
2326
}
1862
2327
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2328
fprintf_plus(stderr, "Retrying in %d seconds\n",
2329
(int)retry_interval);
1865
2330
}
1866
2331
sleep((int)retry_interval);
1867
2332
}
1869
2334
if (not quit_now){
1870
2335
exitcode = EXIT_SUCCESS;
1871
2336
}
1872
2337
1873
2338
goto end;
1874
2339
}
1875
2340
1887
2352
config.publish_domain = 0;
1888
2353
1889
2354
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2356
&config, NULL, NULL, &ret_errno);
1893
2357
1894
2358
/* Free the Avahi configuration data */
1895
2359
avahi_server_config_free(&config);
1897
2361
1898
2362
/* Check if creating the Avahi server object succeeded */
1899
2363
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2364
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2365
avahi_strerror(ret_errno));
1902
2366
exitcode = EX_UNAVAILABLE;
1903
2367
goto end;
1904
2368
}
1910
2374
/* Create the Avahi service browser */
1911
2375
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
2376
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
2377
NULL, 0, browse_callback,
2378
(void *)&mc);
1914
2379
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2380
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2381
avahi_strerror(avahi_server_errno(mc.server)));
1917
2382
exitcode = EX_UNAVAILABLE;
1918
2383
goto end;
1919
2384
}
1925
2390
/* Run the main loop */
1926
2391
1927
2392
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2393
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2394
}
1930
2395
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2396
ret = avahi_loop_with_timeout(simple_poll,
2397
(int)(retry_interval * 1000), &mc);
1933
2398
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2399
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2400
(ret == 0) ? "successfully" : "with error");
1936
2401
}
1937
2402
1938
2403
end:
1939
2404
1940
2405
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2406
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2407
}
1943
2408
1944
2409
/* Cleanup things */
2410
free(mc.interfaces);
2411
1945
2412
if(sb != NULL)
1946
2413
avahi_s_service_browser_free(sb);
1947
2414
1948
2415
if(mc.server != NULL)
1949
2416
avahi_server_free(mc.server);
1950
2417
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2418
if(simple_poll != NULL)
2419
avahi_simple_poll_free(simple_poll);
1953
2420
1954
2421
if(gnutls_initialized){
1955
2422
gnutls_certificate_free_credentials(mc.cred);
1960
2427
if(gpgme_initialized){
1961
2428
gpgme_release(mc.ctx);
1962
2429
}
1963
2430
1964
2431
/* Cleans up the circular linked list of Mandos servers the client
1965
2432
has seen */
1966
2433
if(mc.current_server != NULL){
1972
2439
}
1973
2440
}
1974
2441
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2442
/* Re-raise priviliges */
2443
{
2444
raise_privileges();
2445
2446
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2449
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
1992
2460
}
1993
2461
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2003
2465
}
2004
2466
}
2467
2468
lower_privileges_permanently();
2005
2469
}
2006
2470
2471
free(interfaces_to_take_down);
2472
free(interfaces_hooks);
2473
2007
2474
/* Removes the GPGME temp directory and all files inside */
2008
2475
if(tempdir_created){
2009
2476
struct dirent **direntries = NULL;
2022
2489
}
2023
2490
ret = remove(fullname);
2024
2491
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2492
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2493
strerror(errno));
2027
2494
}
2028
2495
free(fullname);
2029
2496
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0