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- Committer: Teddy Hogeborn
- Date: 2014-01-20 21:50:11 UTC
- Revision ID: teddy@recompile.se-20140120215011-ka70v54d3rb2pyug
Bug fix from libdir change: make plugins get setuid bit again.
* debian/mandos-client.lintian-overrides: Libdir changes.
* debian/rules (override_dh_fixperms): - '' -
* debian/mandos-client.lintian-overrides: Libdir changes.
* debian/rules (override_dh_fixperms): - '' -
- 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
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";
129
136
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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 (int)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
/* Set GPGME home directory for the OpenPGP engine only */
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 the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
636
695
if(ret != 0){
637
696
return -1;
638
697
}
639
698
640
699
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
643
702
}
644
703
645
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
730
}
672
731
if(ret == 0){
673
732
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
734
errno = e;
676
735
goto mandos_end;
677
736
}
678
737
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
683
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
686
748
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
749
fprintf_plus(stderr, "An IPv6 link-local address is"
750
" incomplete without a network interface\n");
689
751
errno = EINVAL;
690
752
goto mandos_end;
691
753
}
693
755
to.in6.sin6_scope_id = (uint32_t)if_index;
694
756
}
695
757
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
758
to.in.sin_port = htons(port);
699
759
}
700
760
701
761
if(quit_now){
709
769
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
770
perror_plus("if_indextoname");
711
771
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
714
774
}
715
775
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
718
778
}
719
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
790
perror_plus("inet_ntop");
731
791
} else {
732
792
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
794
}
735
795
}
736
796
}
764
824
while(true){
765
825
size_t out_size = strlen(out);
766
826
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
827
out_size - written));
768
828
if(ret == -1){
769
829
int e = errno;
770
830
perror_plus("write");
790
850
}
791
851
792
852
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
853
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
854
}
795
855
796
856
if(quit_now){
798
858
goto mandos_end;
799
859
}
800
860
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
803
866
804
867
if(quit_now){
805
868
errno = EINTR;
816
879
817
880
if(ret != GNUTLS_E_SUCCESS){
818
881
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
882
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
883
gnutls_perror(ret);
821
884
}
822
885
errno = EPROTO;
826
889
/* Read OpenPGP packet that contains the wanted password */
827
890
828
891
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
892
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
893
" %s\n", ip);
831
894
}
832
895
833
896
while(true){
838
901
}
839
902
840
903
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
904
buffer_capacity);
842
905
if(buffer_capacity == 0){
843
906
int e = errno;
844
907
perror_plus("incbuffer");
871
934
}
872
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
936
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
937
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
938
"***\n");
875
939
gnutls_perror(ret);
876
940
errno = EPROTO;
877
941
goto mandos_end;
878
942
}
879
943
break;
880
944
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
945
fprintf_plus(stderr, "Unknown error while reading data from"
946
" encrypted session with Mandos server\n");
883
947
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
948
errno = EIO;
885
949
goto mandos_end;
890
954
}
891
955
892
956
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
957
fprintf_plus(stderr, "Closing TLS session\n");
894
958
}
895
959
896
960
if(quit_now){
908
972
909
973
if(buffer_length > 0){
910
974
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
914
977
if(decrypted_buffer_size >= 0){
915
978
916
979
written = 0;
926
989
if(ret == 0 and ferror(stdout)){
927
990
int e = errno;
928
991
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
992
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
993
strerror(errno));
931
994
}
932
995
errno = e;
933
996
goto mandos_end;
977
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1042
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
982
1047
983
1048
/* Called whenever a service has been resolved successfully or
984
1049
timed out */
990
1055
switch(event){
991
1056
default:
992
1057
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)));
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
996
1063
break;
997
1064
998
1065
case AVAHI_RESOLVER_FOUND:
1000
1067
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1068
avahi_address_snprint(ip, sizeof(ip), address);
1002
1069
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);
1070
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
host_name, ip, (intmax_t)interface, port);
1006
1073
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1009
1078
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1079
avahi_simple_poll_quit(simple_poll);
1011
1080
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
1014
1087
}
1015
1088
}
1016
1089
}
1026
1099
const char *domain,
1027
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1101
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
1031
1106
1032
1107
/* Called whenever a new services becomes available on the LAN or
1033
1108
is removed from the LAN */
1040
1115
default:
1041
1116
case AVAHI_BROWSER_FAILURE:
1042
1117
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
1046
1122
return;
1047
1123
1048
1124
case AVAHI_BROWSER_NEW:
1051
1127
the callback function is called the Avahi server will free the
1052
1128
resolver for us. */
1053
1129
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)));
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1059
1138
break;
1060
1139
1061
1140
case AVAHI_BROWSER_REMOVE:
1064
1143
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1144
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1145
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1146
fprintf_plus(stderr, "No Mandos server found, still"
1147
" searching...\n");
1068
1148
}
1069
1149
break;
1070
1150
}
1079
1159
signal_received = sig;
1080
1160
int old_errno = errno;
1081
1161
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1084
1164
}
1085
1165
errno = old_errno;
1086
1166
}
1087
1167
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
int ret;
1170
error_t ret_errno;
1171
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
if(s < 0){
1174
ret_errno = errno;
1175
perror_plus("socket");
1176
errno = ret_errno;
1177
return false;
1178
}
1179
strcpy(ifr->ifr_name, ifname);
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
if(ret == -1){
1182
if(debug){
1183
ret_errno = errno;
1184
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
}
1187
return false;
1188
}
1189
return true;
1190
}
1191
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1193
1194
/* Reject the loopback device */
1195
if(ifr->ifr_flags & IFF_LOOPBACK){
1196
if(debug){
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1198
ifname);
1199
}
1200
return false;
1201
}
1202
/* Accept point-to-point devices only if connect_to is specified */
1203
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1204
if(debug){
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1207
}
1208
return true;
1209
}
1210
/* Otherwise, reject non-broadcast-capable devices */
1211
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1212
if(debug){
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1215
}
1216
return false;
1217
}
1218
/* Reject non-ARP interfaces (including dummy interfaces) */
1219
if(ifr->ifr_flags & IFF_NOARP){
1220
if(debug){
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1222
ifname);
1223
}
1224
return false;
1225
}
1226
1227
/* Accept this device */
1228
if(debug){
1229
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1230
}
1231
return true;
1232
}
1233
1088
1234
/*
1089
1235
* This function determines if a directory entry in /sys/class/net
1090
1236
* corresponds to an acceptable network device.
1091
1237
* (This function is passed to scandir(3) as a filter function.)
1092
1238
*/
1093
1239
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1240
if(if_entry->d_name[0] == '.'){
1097
1241
return 0;
1098
1242
}
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);
1243
1244
struct ifreq ifr;
1245
if(not get_flags(if_entry->d_name, &ifr)){
1246
if(debug){
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
if(not good_flags(if_entry->d_name, &ifr)){
1254
return 0;
1189
1255
}
1190
1256
return 1;
1191
1257
}
1192
1258
1259
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1289
}
1290
1193
1291
int notdotentries(const struct dirent *direntry){
1194
1292
/* Skip "." and ".." */
1195
1293
if(direntry->d_name[0] == '.'
1201
1299
return 1;
1202
1300
}
1203
1301
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1302
/* Is this directory entry a runnable program? */
1303
int runnable_hook(const struct dirent *direntry){
1304
int ret;
1305
size_t sret;
1306
struct stat st;
1307
1308
if((direntry->d_name)[0] == '\0'){
1309
/* Empty name? */
1310
return 0;
1311
}
1312
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
"abcdefghijklmnopqrstuvwxyz"
1315
"0123456789"
1316
"_-");
1317
if((direntry->d_name)[sret] != '\0'){
1318
/* Contains non-allowed characters */
1319
if(debug){
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1321
direntry->d_name);
1322
}
1323
return 0;
1324
}
1325
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1334
if(ret == -1){
1335
if(debug){
1336
perror_plus("Could not stat hook");
1337
}
1338
return 0;
1339
}
1340
if(not (S_ISREG(st.st_mode))){
1341
/* Not a regular file */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1349
/* Not executable */
1350
if(debug){
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1352
direntry->d_name);
1353
}
1354
return 0;
1355
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1360
return 1;
1361
}
1362
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1205
1365
int ret;
1206
1366
struct timespec now;
1207
1367
struct timespec waited_time;
1208
1368
intmax_t block_time;
1209
1369
1210
1370
while(true){
1211
if(mc.current_server == NULL){
1371
if(mc->current_server == NULL){
1212
1372
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1373
fprintf_plus(stderr, "Wait until first server is found."
1374
" No timeout!\n");
1215
1375
}
1216
1376
ret = avahi_simple_poll_iterate(s, -1);
1217
1377
} else {
1218
1378
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1379
fprintf_plus(stderr, "Check current_server if we should run"
1380
" it, or wait\n");
1221
1381
}
1222
1382
/* the current time */
1223
1383
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1228
1388
/* Calculating in ms how long time between now and server
1229
1389
who we visted longest time ago. Now - last seen. */
1230
1390
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1391
- mc->current_server->last_seen.tv_sec);
1232
1392
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1393
- mc->current_server->last_seen.tv_nsec);
1234
1394
/* total time is 10s/10,000ms.
1235
1395
Converting to s from ms by dividing by 1,000,
1236
1396
and ns to ms by dividing by 1,000,000. */
1239
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1400
1241
1401
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
block_time);
1243
1404
}
1244
1405
1245
1406
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);
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1250
1411
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1412
avahi_simple_poll_quit(s);
1252
1413
return 0;
1253
1414
}
1254
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1416
&mc->current_server->last_seen);
1256
1417
if(ret == -1){
1257
1418
perror_plus("clock_gettime");
1258
1419
return -1;
1259
1420
}
1260
mc.current_server = mc.current_server->next;
1421
mc->current_server = mc->current_server->next;
1261
1422
block_time = 0; /* Call avahi to find new Mandos
1262
1423
servers, but don't block */
1263
1424
}
1265
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1427
}
1267
1428
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1429
if (ret > 0 or errno != EINTR){
1269
1430
return (ret != 1) ? ret : 0;
1270
1431
}
1271
1432
}
1272
1433
}
1273
1434
}
1274
1435
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1489
const float delay){
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1511
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1582
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1619
}
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
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
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1275
1793
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1276
1798
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1799
error_t ret_errno;
1278
1800
int ret;
1279
1801
intmax_t tmpmax;
1280
1802
char *tmp;
1281
1803
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;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
1288
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1289
1807
bool tempdir_created = false;
1290
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
1809
const char *seckey = PATHDIR "/" SECKEY;
1292
1810
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1293
1813
1294
1814
bool gnutls_initialized = false;
1295
1815
bool gpgme_initialized = false;
1357
1877
.group = 2 },
1358
1878
{ .name = "retry", .key = 132,
1359
1879
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1361
1885
.group = 2 },
1362
1886
/*
1363
1887
* These reproduce what we would get without ARGP_NO_HELP
1382
1906
connect_to = arg;
1383
1907
break;
1384
1908
case 'i': /* --interface */
1385
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
}
1386
1914
break;
1387
1915
case 's': /* --seckey */
1388
1916
seckey = arg;
1417
1945
argp_error(state, "Bad retry interval");
1418
1946
}
1419
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1420
1951
/*
1421
1952
* These reproduce what we would get without ARGP_NO_HELP
1422
1953
*/
1428
1959
argp_state_help(state, state->out_stream,
1429
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1961
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1963
exit(argp_err_exit_status);
1433
1964
break;
1434
1965
default:
1461
1992
{
1462
1993
/* Work around Debian bug #633582:
1463
1994
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1995
1466
1996
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1474
if(seckey_fd == -1){
1475
perror_plus("open");
1476
} else {
1477
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1478
if(ret == -1){
1479
perror_plus("fstat");
1480
} else {
1481
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1482
ret = fchown(seckey_fd, uid, gid);
1483
if(ret == -1){
1484
perror_plus("fchown");
1485
}
1486
}
1487
}
1488
TEMP_FAILURE_RETRY(close(seckey_fd));
1489
}
1490
1491
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1492
if(pubkey_fd == -1){
1493
perror_plus("open");
1494
} else {
1495
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1496
if(ret == -1){
1497
perror_plus("fstat");
1498
} else {
1499
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1500
ret = fchown(pubkey_fd, uid, gid);
1501
if(ret == -1){
1502
perror_plus("fchown");
1503
}
1504
}
1505
}
1506
TEMP_FAILURE_RETRY(close(pubkey_fd));
1507
}
1508
1509
/* Lower privileges */
1510
errno = 0;
1511
ret = seteuid(uid);
1512
if(ret == -1){
1513
perror_plus("seteuid");
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
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
1514
2080
}
1515
2081
}
1516
2082
1517
2083
if(not debug){
1518
2084
avahi_set_log_function(empty_log);
1519
2085
}
1520
1521
if(interface[0] == '\0'){
1522
struct dirent **direntries;
1523
ret = scandir(sys_class_net, &direntries, good_interface,
1524
alphasort);
1525
if(ret >= 1){
1526
/* Pick the first good interface */
1527
interface = strdup(direntries[0]->d_name);
1528
if(debug){
1529
fprintf(stderr, "Using interface \"%s\"\n", interface);
1530
}
1531
if(interface == NULL){
1532
perror_plus("malloc");
1533
free(direntries);
1534
exitcode = EXIT_FAILURE;
1535
goto end;
1536
}
1537
free(direntries);
1538
} else {
1539
free(direntries);
1540
fprintf(stderr, "Could not find a network interface\n");
1541
exitcode = EXIT_FAILURE;
1542
goto end;
1543
}
1544
}
1545
2086
1546
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1547
2088
from the signal handler */
1548
2089
/* Initialize the pseudo-RNG for Avahi */
1549
2090
srand((unsigned int) time(NULL));
1550
mc.simple_poll = avahi_simple_poll_new();
1551
if(mc.simple_poll == NULL){
1552
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
1553
2095
exitcode = EX_UNAVAILABLE;
1554
2096
goto end;
1555
2097
}
1617
2159
}
1618
2160
}
1619
2161
1620
/* If the interface is down, bring it up */
1621
if(strcmp(interface, "none") != 0){
1622
if_index = (AvahiIfIndex) if_nametoindex(interface);
1623
if(if_index == 0){
1624
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1625
exitcode = EX_UNAVAILABLE;
1626
goto end;
1627
}
1628
1629
if(quit_now){
1630
goto end;
1631
}
1632
1633
/* Re-raise priviliges */
1634
errno = 0;
1635
ret = seteuid(0);
1636
if(ret == -1){
1637
perror_plus("seteuid");
1638
}
1639
1640
#ifdef __linux__
1641
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1642
messages about the network interface to mess up the prompt */
1643
ret = klogctl(8, NULL, 5);
1644
bool restore_loglevel = true;
1645
if(ret == -1){
1646
restore_loglevel = false;
1647
perror_plus("klogctl");
1648
}
1649
#endif /* __linux__ */
1650
1651
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1652
if(sd < 0){
1653
perror_plus("socket");
1654
exitcode = EX_OSERR;
1655
#ifdef __linux__
1656
if(restore_loglevel){
1657
ret = klogctl(7, NULL, 0);
1658
if(ret == -1){
1659
perror_plus("klogctl");
1660
}
1661
}
1662
#endif /* __linux__ */
1663
/* Lower privileges */
1664
errno = 0;
1665
ret = seteuid(uid);
1666
if(ret == -1){
1667
perror_plus("seteuid");
1668
}
1669
goto end;
1670
}
1671
strcpy(network.ifr_name, interface);
1672
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1673
if(ret == -1){
1674
perror_plus("ioctl SIOCGIFFLAGS");
1675
#ifdef __linux__
1676
if(restore_loglevel){
1677
ret = klogctl(7, NULL, 0);
1678
if(ret == -1){
1679
perror_plus("klogctl");
1680
}
1681
}
1682
#endif /* __linux__ */
1683
exitcode = EX_OSERR;
1684
/* Lower privileges */
1685
errno = 0;
1686
ret = seteuid(uid);
1687
if(ret == -1){
1688
perror_plus("seteuid");
1689
}
1690
goto end;
1691
}
1692
if((network.ifr_flags & IFF_UP) == 0){
1693
network.ifr_flags |= IFF_UP;
1694
take_down_interface = true;
1695
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1696
if(ret == -1){
1697
take_down_interface = false;
1698
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1699
exitcode = EX_OSERR;
1700
#ifdef __linux__
1701
if(restore_loglevel){
1702
ret = klogctl(7, NULL, 0);
1703
if(ret == -1){
1704
perror_plus("klogctl");
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
1705
2208
}
1706
2209
}
1707
#endif /* __linux__ */
1708
/* Lower privileges */
1709
errno = 0;
1710
ret = seteuid(uid);
1711
if(ret == -1){
1712
perror_plus("seteuid");
1713
}
1714
goto end;
1715
}
1716
}
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1721
if(ret == -1){
1722
perror_plus("ioctl SIOCGIFFLAGS");
1723
} else if(network.ifr_flags & IFF_RUNNING){
1724
2210
break;
1725
2211
}
1726
struct timespec sleeptime = { .tv_nsec = 250000000 };
1727
ret = nanosleep(&sleeptime, NULL);
1728
if(ret == -1 and errno != EINTR){
1729
perror_plus("nanosleep");
1730
}
1731
}
1732
if(not take_down_interface){
1733
/* We won't need the socket anymore */
1734
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1735
if(ret == -1){
1736
perror_plus("close");
1737
}
1738
}
1739
#ifdef __linux__
1740
if(restore_loglevel){
1741
/* Restores kernel loglevel to default */
1742
ret = klogctl(7, NULL, 0);
1743
if(ret == -1){
1744
perror_plus("klogctl");
1745
}
1746
}
1747
#endif /* __linux__ */
1748
/* Lower privileges */
1749
errno = 0;
1750
if(take_down_interface){
1751
/* Lower privileges */
1752
ret = seteuid(uid);
1753
if(ret == -1){
1754
perror_plus("seteuid");
1755
}
1756
} else {
1757
/* Lower privileges permanently */
1758
ret = setuid(uid);
1759
if(ret == -1){
1760
perror_plus("setuid");
1761
}
1762
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1763
2237
}
1764
2238
1765
2239
if(quit_now){
1766
2240
goto end;
1767
2241
}
1768
2242
1769
ret = init_gnutls_global(pubkey, seckey);
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
1770
2244
if(ret == -1){
1771
fprintf(stderr, "init_gnutls_global failed\n");
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
1772
2246
exitcode = EX_UNAVAILABLE;
1773
2247
goto end;
1774
2248
} else {
1789
2263
goto end;
1790
2264
}
1791
2265
1792
if(not init_gpgme(pubkey, seckey, tempdir)){
1793
fprintf(stderr, "init_gpgme failed\n");
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2267
fprintf_plus(stderr, "init_gpgme failed\n");
1794
2268
exitcode = EX_UNAVAILABLE;
1795
2269
goto end;
1796
2270
} else {
1805
2279
/* Connect directly, do not use Zeroconf */
1806
2280
/* (Mainly meant for debugging) */
1807
2281
char *address = strrchr(connect_to, ':');
2282
1808
2283
if(address == NULL){
1809
fprintf(stderr, "No colon in address\n");
2284
fprintf_plus(stderr, "No colon in address\n");
1810
2285
exitcode = EX_USAGE;
1811
2286
goto end;
1812
2287
}
1815
2290
goto end;
1816
2291
}
1817
2292
1818
uint16_t port;
2293
in_port_t port;
1819
2294
errno = 0;
1820
2295
tmpmax = strtoimax(address+1, &tmp, 10);
1821
2296
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1822
or tmpmax != (uint16_t)tmpmax){
1823
fprintf(stderr, "Bad port number\n");
2297
or tmpmax != (in_port_t)tmpmax){
2298
fprintf_plus(stderr, "Bad port number\n");
1824
2299
exitcode = EX_USAGE;
1825
2300
goto end;
1826
2301
}
1827
2302
1828
2303
if(quit_now){
1829
2304
goto end;
1830
2305
}
1831
2306
1832
port = (uint16_t)tmpmax;
2307
port = (in_port_t)tmpmax;
1833
2308
*address = '\0';
1834
2309
/* Colon in address indicates IPv6 */
1835
2310
int af;
1851
2326
}
1852
2327
1853
2328
while(not quit_now){
1854
ret = start_mandos_communication(address, port, if_index, af);
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
1855
2331
if(quit_now or ret == 0){
1856
2332
break;
1857
2333
}
1858
2334
if(debug){
1859
fprintf(stderr, "Retrying in %d seconds\n",
1860
(int)retry_interval);
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
(int)retry_interval);
1861
2337
}
1862
sleep((int)retry_interval);
1863
};
1864
2338
sleep((unsigned int)retry_interval);
2339
}
2340
1865
2341
if (not quit_now){
1866
2342
exitcode = EXIT_SUCCESS;
1867
2343
}
1868
2344
1869
2345
goto end;
1870
2346
}
1871
2347
1883
2359
config.publish_domain = 0;
1884
2360
1885
2361
/* Allocate a new server */
1886
mc.server = avahi_server_new(avahi_simple_poll_get
1887
(mc.simple_poll), &config, NULL,
1888
NULL, &error);
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
1889
2364
1890
2365
/* Free the Avahi configuration data */
1891
2366
avahi_server_config_free(&config);
1893
2368
1894
2369
/* Check if creating the Avahi server object succeeded */
1895
2370
if(mc.server == NULL){
1896
fprintf(stderr, "Failed to create Avahi server: %s\n",
1897
avahi_strerror(error));
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
1898
2373
exitcode = EX_UNAVAILABLE;
1899
2374
goto end;
1900
2375
}
1906
2381
/* Create the Avahi service browser */
1907
2382
sb = avahi_s_service_browser_new(mc.server, if_index,
1908
2383
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1909
NULL, 0, browse_callback, NULL);
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
1910
2386
if(sb == NULL){
1911
fprintf(stderr, "Failed to create service browser: %s\n",
1912
avahi_strerror(avahi_server_errno(mc.server)));
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
avahi_strerror(avahi_server_errno(mc.server)));
1913
2389
exitcode = EX_UNAVAILABLE;
1914
2390
goto end;
1915
2391
}
1921
2397
/* Run the main loop */
1922
2398
1923
2399
if(debug){
1924
fprintf(stderr, "Starting Avahi loop search\n");
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
1925
2401
}
1926
2402
1927
ret = avahi_loop_with_timeout(mc.simple_poll,
1928
(int)(retry_interval * 1000));
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
1929
2405
if(debug){
1930
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1931
(ret == 0) ? "successfully" : "with error");
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
(ret == 0) ? "successfully" : "with error");
1932
2408
}
1933
2409
1934
2410
end:
1935
2411
1936
2412
if(debug){
1937
fprintf(stderr, "%s exiting\n", argv[0]);
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1938
2414
}
1939
2415
1940
2416
/* Cleanup things */
2417
free(mc.interfaces);
2418
1941
2419
if(sb != NULL)
1942
2420
avahi_s_service_browser_free(sb);
1943
2421
1944
2422
if(mc.server != NULL)
1945
2423
avahi_server_free(mc.server);
1946
2424
1947
if(mc.simple_poll != NULL)
1948
avahi_simple_poll_free(mc.simple_poll);
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
1949
2427
1950
2428
if(gnutls_initialized){
1951
2429
gnutls_certificate_free_credentials(mc.cred);
1956
2434
if(gpgme_initialized){
1957
2435
gpgme_release(mc.ctx);
1958
2436
}
1959
2437
1960
2438
/* Cleans up the circular linked list of Mandos servers the client
1961
2439
has seen */
1962
2440
if(mc.current_server != NULL){
1968
2446
}
1969
2447
}
1970
2448
1971
/* Take down the network interface */
1972
if(take_down_interface){
1973
/* Re-raise priviliges */
1974
errno = 0;
1975
ret = seteuid(0);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
if(geteuid() == 0){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_UP) {
1984
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1985
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2449
/* Re-raise priviliges */
2450
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
1988
2467
}
1989
2468
}
1990
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
if(ret == -1){
1992
perror_plus("close");
1993
}
1994
/* Lower privileges permanently */
1995
errno = 0;
1996
ret = setuid(uid);
1997
if(ret == -1){
1998
perror_plus("setuid");
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
1999
2472
}
2000
2473
}
2474
2475
lower_privileges_permanently();
2001
2476
}
2002
2477
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2480
2003
2481
/* Removes the GPGME temp directory and all files inside */
2004
2482
if(tempdir_created){
2005
2483
struct dirent **direntries = NULL;
2006
2484
struct dirent *direntry = NULL;
2007
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
2008
if (ret > 0){
2009
for(int i = 0; i < ret; i++){
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
2010
2489
direntry = direntries[i];
2011
2490
char *fullname = NULL;
2012
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2017
2496
}
2018
2497
ret = remove(fullname);
2019
2498
if(ret == -1){
2020
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2021
strerror(errno));
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2022
2501
}
2023
2502
free(fullname);
2024
2503
}
2025
2504
}
2026
2505
2027
/* need to be cleaned even if ret == 0 because man page doesn't
2028
specify */
2506
/* need to clean even if 0 because man page doesn't specify */
2029
2507
free(direntries);
2030
if (ret == -1){
2508
if (numentries == -1){
2031
2509
perror_plus("scandir");
2032
2510
}
2033
2511
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0