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- Committer: Björn Påhlsson
- Date: 2011-11-14 18:03:35 UTC
- mto: (505.3.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: belorn@fukt.bsnet.se-20111114180335-3j4x5mjr7lix2jyj
New convinence error printer: fprintf_plus
- files removed:
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
88
98
89
#ifdef __linux__
99
90
#include <sys/klog.h> /* klogctl() */
117
108
init_gnutls_session(),
118
109
GNUTLS_* */
119
110
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
122
113
123
114
/* GPGME */
124
115
#include <gpgme.h> /* All GPGME types, constants and
140
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
132
static const char sys_class_net[] = "/sys/class/net";
142
133
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
134
147
135
/* Doubly linked list that need to be circularly linked when used */
148
136
typedef struct server{
149
137
const char *ip;
150
in_port_t port;
138
uint16_t port;
151
139
AvahiIfIndex if_index;
152
140
int af;
153
141
struct timespec last_seen;
157
145
158
146
/* Used for passing in values through the Avahi callback functions */
159
147
typedef struct {
148
AvahiSimplePoll *simple_poll;
160
149
AvahiServer *server;
161
150
gnutls_certificate_credentials_t cred;
162
151
unsigned int dh_bits;
164
153
const char *priority;
165
154
gpgme_ctx_t ctx;
166
155
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
156
} mandos_context;
170
157
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
173
163
174
164
sig_atomic_t quit_now = 0;
175
165
int signal_received = 0;
176
166
177
167
/* Function to use when printing errors */
178
168
void perror_plus(const char *print_text){
179
int e = errno;
180
169
fprintf(stderr, "Mandos plugin %s: ",
181
170
program_invocation_short_name);
182
errno = e;
183
171
perror(print_text);
184
172
}
185
173
186
__attribute__((format (gnu_printf, 2, 3)))
187
174
int fprintf_plus(FILE *stream, const char *format, ...){
188
175
va_list ap;
189
176
va_start (ap, format);
190
177
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
179
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
180
}
195
181
196
182
/*
199
185
* "buffer_length" is how much is already used.
200
186
*/
201
187
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
188
size_t buffer_capacity){
203
189
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
190
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
191
if(buffer == NULL){
210
192
return 0;
211
193
}
212
*buffer = new_buf;
213
194
buffer_capacity += BUFFER_SIZE;
214
195
}
215
196
return buffer_capacity;
216
197
}
217
198
218
199
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
int af){
221
203
int ret;
222
204
server *new_server = malloc(sizeof(server));
223
205
if(new_server == NULL){
224
206
perror_plus("malloc");
225
return false;
207
return -1;
226
208
}
227
209
*new_server = (server){ .ip = strdup(ip),
228
.port = port,
229
.if_index = if_index,
230
.af = af };
210
.port = port,
211
.if_index = if_index,
212
.af = af };
231
213
if(new_server->ip == NULL){
232
214
perror_plus("strdup");
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
215
return -1;
239
216
}
240
217
/* Special case of first server */
241
if(*current_server == NULL){
218
if (mc.current_server == NULL){
242
219
new_server->next = new_server;
243
220
new_server->prev = new_server;
244
*current_server = new_server;
221
mc.current_server = new_server;
245
222
/* Place the new server last in the list */
246
223
} else {
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
224
new_server->next = mc.current_server;
225
new_server->prev = mc.current_server->prev;
249
226
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
251
}
252
return true;
227
mc.current_server->prev = new_server;
228
}
229
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
if(ret == -1){
231
perror_plus("clock_gettime");
232
return -1;
233
}
234
return 0;
253
235
}
254
236
255
237
/*
256
238
* Initialize GPGME.
257
239
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
240
static bool init_gpgme(const char *seckey,
241
const char *pubkey, const char *tempdir){
260
242
gpgme_error_t rc;
261
243
gpgme_engine_info_t engine_info;
262
244
245
263
246
/*
264
247
* Helper function to insert pub and seckey to the engine keyring.
265
248
*/
276
259
277
260
rc = gpgme_data_new_from_fd(&pgp_data, fd);
278
261
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
262
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
263
gpgme_strsource(rc), gpgme_strerror(rc));
281
264
return false;
282
265
}
283
266
284
rc = gpgme_op_import(mc->ctx, pgp_data);
267
rc = gpgme_op_import(mc.ctx, pgp_data);
285
268
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
288
271
return false;
289
272
}
290
273
297
280
}
298
281
299
282
if(debug){
300
fprintf_plus(stderr, "Initializing GPGME\n");
283
fprintf(stderr, "Initializing GPGME\n");
301
284
}
302
285
303
286
/* Init GPGME */
304
287
gpgme_check_version(NULL);
305
288
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
306
289
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
309
292
return false;
310
293
}
311
294
312
295
/* Set GPGME home directory for the OpenPGP engine only */
313
296
rc = gpgme_get_engine_info(&engine_info);
314
297
if(rc != GPG_ERR_NO_ERROR){
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
298
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
317
300
return false;
318
301
}
319
302
while(engine_info != NULL){
325
308
engine_info = engine_info->next;
326
309
}
327
310
if(engine_info == NULL){
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
311
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
330
312
return false;
331
313
}
332
314
333
315
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
316
rc = gpgme_new(&(mc.ctx));
335
317
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
318
fprintf(stderr, "bad gpgme_new: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
339
320
return false;
340
321
}
341
322
352
333
*/
353
334
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
335
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
336
char **plaintext){
357
337
gpgme_data_t dh_crypto, dh_plain;
358
338
gpgme_error_t rc;
359
339
ssize_t ret;
361
341
ssize_t plaintext_length = 0;
362
342
363
343
if(debug){
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
344
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
365
345
}
366
346
367
347
/* Create new GPGME data buffer from memory cryptotext */
368
348
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
369
349
0);
370
350
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
351
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
373
353
return -1;
374
354
}
375
355
376
356
/* Create new empty GPGME data buffer for the plaintext */
377
357
rc = gpgme_data_new(&dh_plain);
378
358
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
382
361
gpgme_data_release(dh_crypto);
383
362
return -1;
384
363
}
385
364
386
365
/* Decrypt data from the cryptotext data buffer to the plaintext
387
366
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
367
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
368
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
369
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
392
371
plaintext_length = -1;
393
372
if(debug){
394
373
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
374
result = gpgme_op_decrypt_result(mc.ctx);
396
375
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
376
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
398
377
} else {
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
378
fprintf(stderr, "Unsupported algorithm: %s\n",
379
result->unsupported_algorithm);
380
fprintf(stderr, "Wrong key usage: %u\n",
381
result->wrong_key_usage);
403
382
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
383
fprintf(stderr, "File name: %s\n", result->file_name);
405
384
}
406
385
gpgme_recipient_t recipient;
407
386
recipient = result->recipients;
408
387
while(recipient != NULL){
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
388
fprintf(stderr, "Public key algorithm: %s\n",
389
gpgme_pubkey_algo_name(recipient->pubkey_algo));
390
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
391
fprintf(stderr, "Secret key available: %s\n",
392
recipient->status == GPG_ERR_NO_SECKEY
393
? "No" : "Yes");
416
394
recipient = recipient->next;
417
395
}
418
396
}
421
399
}
422
400
423
401
if(debug){
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
402
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
425
403
}
426
404
427
405
/* Seek back to the beginning of the GPGME plaintext data buffer */
434
412
*plaintext = NULL;
435
413
while(true){
436
414
plaintext_capacity = incbuffer(plaintext,
437
(size_t)plaintext_length,
438
plaintext_capacity);
415
(size_t)plaintext_length,
416
plaintext_capacity);
439
417
if(plaintext_capacity == 0){
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
418
perror_plus("incbuffer");
419
plaintext_length = -1;
420
goto decrypt_end;
443
421
}
444
422
445
423
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
458
436
}
459
437
460
438
if(debug){
461
fprintf_plus(stderr, "Decrypted password is: ");
439
fprintf(stderr, "Decrypted password is: ");
462
440
for(ssize_t i = 0; i < plaintext_length; i++){
463
441
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
442
}
476
454
}
477
455
478
456
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
457
const char *ret = gnutls_strerror(value); /* Spurious warning from
458
-Wunreachable-code */
480
459
if(ret == NULL)
481
460
ret = "(unknown)";
482
461
return ret;
485
464
/* GnuTLS log function callback */
486
465
static void debuggnutls(__attribute__((unused)) int level,
487
466
const char* string){
488
fprintf_plus(stderr, "GnuTLS: %s", string);
467
fprintf(stderr, "GnuTLS: %s", string);
489
468
}
490
469
491
470
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
471
const char *seckeyfilename){
494
472
int ret;
495
473
496
474
if(debug){
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
475
fprintf(stderr, "Initializing GnuTLS\n");
498
476
}
499
477
500
478
ret = gnutls_global_init();
501
479
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
480
fprintf(stderr, "GnuTLS global_init: %s\n",
481
safer_gnutls_strerror(ret));
504
482
return -1;
505
483
}
506
484
513
491
}
514
492
515
493
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
494
ret = gnutls_certificate_allocate_credentials(&mc.cred);
517
495
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
496
fprintf(stderr, "GnuTLS memory error: %s\n",
497
safer_gnutls_strerror(ret));
520
498
gnutls_global_deinit();
521
499
return -1;
522
500
}
523
501
524
502
if(debug){
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
503
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
504
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
505
seckeyfilename);
529
506
}
530
507
531
508
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
509
(mc.cred, pubkeyfilename, seckeyfilename,
533
510
GNUTLS_OPENPGP_FMT_BASE64);
534
511
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
safer_gnutls_strerror(ret));
512
fprintf(stderr,
513
"Error[%d] while reading the OpenPGP key pair ('%s',"
514
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
515
fprintf(stderr, "The GnuTLS error is: %s\n",
516
safer_gnutls_strerror(ret));
540
517
goto globalfail;
541
518
}
542
519
543
520
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
521
ret = gnutls_dh_params_init(&mc.dh_params);
545
522
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
523
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
524
" %s\n", safer_gnutls_strerror(ret));
549
525
goto globalfail;
550
526
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
527
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
528
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
529
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
530
safer_gnutls_strerror(ret));
555
531
goto globalfail;
556
532
}
557
533
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
534
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
535
560
536
return 0;
561
537
562
538
globalfail:
563
539
564
gnutls_certificate_free_credentials(mc->cred);
540
gnutls_certificate_free_credentials(mc.cred);
565
541
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
542
gnutls_dh_params_deinit(mc.dh_params);
567
543
return -1;
568
544
}
569
545
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
546
static int init_gnutls_session(gnutls_session_t *session){
572
547
int ret;
573
548
/* GnuTLS session creation */
574
549
do {
578
553
}
579
554
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
555
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
556
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
557
safer_gnutls_strerror(ret));
584
558
}
585
559
586
560
{
587
561
const char *err;
588
562
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
563
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
564
if(quit_now){
591
565
gnutls_deinit(*session);
592
566
return -1;
593
567
}
594
568
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
595
569
if(ret != GNUTLS_E_SUCCESS){
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
570
fprintf(stderr, "Syntax error at: %s\n", err);
571
fprintf(stderr, "GnuTLS error: %s\n",
572
safer_gnutls_strerror(ret));
599
573
gnutls_deinit(*session);
600
574
return -1;
601
575
}
603
577
604
578
do {
605
579
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
580
mc.cred);
607
581
if(quit_now){
608
582
gnutls_deinit(*session);
609
583
return -1;
610
584
}
611
585
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
612
586
if(ret != GNUTLS_E_SUCCESS){
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
587
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
615
589
gnutls_deinit(*session);
616
590
return -1;
617
591
}
619
593
/* ignore client certificate if any. */
620
594
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
595
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
597
624
598
return 0;
625
599
}
629
603
__attribute__((unused)) const char *txt){}
630
604
631
605
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
606
static int start_mandos_communication(const char *ip, uint16_t port,
633
607
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
608
int af){
635
609
int ret, tcp_sd = -1;
636
610
ssize_t sret;
637
struct sockaddr_storage to;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
638
615
char *buffer = NULL;
639
616
char *decrypted_buffer = NULL;
640
617
size_t buffer_length = 0;
659
636
pf = PF_INET;
660
637
break;
661
638
default:
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
639
fprintf(stderr, "Bad address family: %d\n", af);
663
640
errno = EINVAL;
664
641
return -1;
665
642
}
666
643
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
644
ret = init_gnutls_session(&session);
700
645
if(ret != 0){
701
646
return -1;
702
647
}
703
648
704
649
if(debug){
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
650
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
707
652
}
708
653
709
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
721
666
722
667
memset(&to, 0, sizeof(to));
723
668
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
726
671
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
729
674
}
730
675
if(ret < 0 ){
731
676
int e = errno;
735
680
}
736
681
if(ret == 0){
737
682
int e = errno;
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
683
fprintf(stderr, "Bad address: %s\n", ip);
739
684
errno = e;
740
685
goto mandos_end;
741
686
}
742
687
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
746
695
if(if_index == AVAHI_IF_UNSPEC){
747
fprintf_plus(stderr, "An IPv6 link-local address is"
748
" incomplete without a network interface\n");
696
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
749
698
errno = EINVAL;
750
699
goto mandos_end;
751
700
}
752
701
/* Set the network interface number as scope */
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
702
to.in6.sin6_scope_id = (uint32_t)if_index;
754
703
}
755
704
} else {
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
757
708
}
758
709
759
710
if(quit_now){
767
718
if(if_indextoname((unsigned int)if_index, interface) == NULL){
768
719
perror_plus("if_indextoname");
769
720
} else {
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
721
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
772
723
}
773
724
} else {
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
725
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
726
port);
776
727
}
777
728
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
778
729
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
const char *pcret;
779
731
if(af == AF_INET6){
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
732
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
733
sizeof(addrstr));
784
734
} else {
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
735
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
736
sizeof(addrstr));
789
737
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
738
if(pcret == NULL){
739
perror_plus("inet_ntop");
740
} else {
741
if(strcmp(addrstr, ip) != 0){
742
fprintf(stderr, "Canonical address form: %s\n", addrstr);
743
}
796
744
}
797
745
}
798
746
802
750
}
803
751
804
752
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
753
ret = connect(tcp_sd, &to.in6, sizeof(to));
807
754
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
755
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
810
756
}
811
757
if(ret < 0){
812
758
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
827
773
while(true){
828
774
size_t out_size = strlen(out);
829
775
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
830
out_size - written));
776
out_size - written));
831
777
if(ret == -1){
832
778
int e = errno;
833
779
perror_plus("write");
853
799
}
854
800
855
801
if(debug){
856
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
802
fprintf(stderr, "Establishing TLS session with %s\n", ip);
857
803
}
858
804
859
805
if(quit_now){
861
807
goto mandos_end;
862
808
}
863
809
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
810
/* Spurious warning from -Wint-to-pointer-cast */
811
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
869
812
870
813
if(quit_now){
871
814
errno = EINTR;
882
825
883
826
if(ret != GNUTLS_E_SUCCESS){
884
827
if(debug){
885
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
828
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
886
829
gnutls_perror(ret);
887
830
}
888
831
errno = EPROTO;
892
835
/* Read OpenPGP packet that contains the wanted password */
893
836
894
837
if(debug){
895
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
896
" %s\n", ip);
838
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
839
ip);
897
840
}
898
841
899
842
while(true){
904
847
}
905
848
906
849
buffer_capacity = incbuffer(&buffer, buffer_length,
907
buffer_capacity);
850
buffer_capacity);
908
851
if(buffer_capacity == 0){
909
852
int e = errno;
910
853
perror_plus("incbuffer");
937
880
}
938
881
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
939
882
if(ret < 0){
940
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
941
"***\n");
883
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
942
884
gnutls_perror(ret);
943
885
errno = EPROTO;
944
886
goto mandos_end;
945
887
}
946
888
break;
947
889
default:
948
fprintf_plus(stderr, "Unknown error while reading data from"
949
" encrypted session with Mandos server\n");
890
fprintf(stderr, "Unknown error while reading data from"
891
" encrypted session with Mandos server\n");
950
892
gnutls_bye(session, GNUTLS_SHUT_RDWR);
951
893
errno = EIO;
952
894
goto mandos_end;
957
899
}
958
900
959
901
if(debug){
960
fprintf_plus(stderr, "Closing TLS session\n");
902
fprintf(stderr, "Closing TLS session\n");
961
903
}
962
904
963
905
if(quit_now){
975
917
976
918
if(buffer_length > 0){
977
919
ssize_t decrypted_buffer_size;
978
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
979
&decrypted_buffer, mc);
920
decrypted_buffer_size = pgp_packet_decrypt(buffer,
921
buffer_length,
922
&decrypted_buffer);
980
923
if(decrypted_buffer_size >= 0){
981
924
982
925
written = 0;
992
935
if(ret == 0 and ferror(stdout)){
993
936
int e = errno;
994
937
if(debug){
995
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
996
strerror(errno));
938
fprintf(stderr, "Error writing encrypted data: %s\n",
939
strerror(errno));
997
940
}
998
941
errno = e;
999
942
goto mandos_end;
1043
986
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
987
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
988
flags,
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
989
AVAHI_GCC_UNUSED void* userdata){
990
assert(r);
1050
991
1051
992
/* Called whenever a service has been resolved successfully or
1052
993
timed out */
1058
999
switch(event){
1059
1000
default:
1060
1001
case AVAHI_RESOLVER_FAILURE:
1061
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1062
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1063
domain,
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
1002
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1003
" of type '%s' in domain '%s': %s\n", name, type, domain,
1004
avahi_strerror(avahi_server_errno(mc.server)));
1066
1005
break;
1067
1006
1068
1007
case AVAHI_RESOLVER_FOUND:
1070
1009
char ip[AVAHI_ADDRESS_STR_MAX];
1071
1010
avahi_address_snprint(ip, sizeof(ip), address);
1072
1011
if(debug){
1073
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1074
PRIdMAX ") on port %" PRIu16 "\n", name,
1075
host_name, ip, (intmax_t)interface, port);
1012
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1013
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1014
ip, (intmax_t)interface, port);
1076
1015
}
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
1016
int ret = start_mandos_communication(ip, port, interface,
1017
avahi_proto_to_af(proto));
1081
1018
if(ret == 0){
1082
avahi_simple_poll_quit(simple_poll);
1019
avahi_simple_poll_quit(mc.simple_poll);
1083
1020
} else {
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1087
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
" list\n", name);
1089
}
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
1090
1023
}
1091
1024
}
1092
1025
}
1102
1035
const char *domain,
1103
1036
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
1037
flags,
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
1038
AVAHI_GCC_UNUSED void* userdata){
1039
assert(b);
1109
1040
1110
1041
/* Called whenever a new services becomes available on the LAN or
1111
1042
is removed from the LAN */
1118
1049
default:
1119
1050
case AVAHI_BROWSER_FAILURE:
1120
1051
1121
fprintf_plus(stderr, "(Avahi browser) %s\n",
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
1052
fprintf(stderr, "(Avahi browser) %s\n",
1053
avahi_strerror(avahi_server_errno(mc.server)));
1054
avahi_simple_poll_quit(mc.simple_poll);
1125
1055
return;
1126
1056
1127
1057
case AVAHI_BROWSER_NEW:
1130
1060
the callback function is called the Avahi server will free the
1131
1061
resolver for us. */
1132
1062
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1137
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1138
" %s\n", name,
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1063
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1064
name, type, domain, protocol, 0,
1065
resolve_callback, NULL) == NULL)
1066
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1067
name, avahi_strerror(avahi_server_errno(mc.server)));
1141
1068
break;
1142
1069
1143
1070
case AVAHI_BROWSER_REMOVE:
1146
1073
case AVAHI_BROWSER_ALL_FOR_NOW:
1147
1074
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1148
1075
if(debug){
1149
fprintf_plus(stderr, "No Mandos server found, still"
1150
" searching...\n");
1076
fprintf(stderr, "No Mandos server found, still searching...\n");
1151
1077
}
1152
1078
break;
1153
1079
}
1162
1088
signal_received = sig;
1163
1089
int old_errno = errno;
1164
1090
/* set main loop to exit */
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1091
if(mc.simple_poll != NULL){
1092
avahi_simple_poll_quit(mc.simple_poll);
1167
1093
}
1168
1094
errno = old_errno;
1169
1095
}
1170
1096
1171
1097
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
1098
int ret;
1173
error_t ret_errno;
1174
1099
1175
1100
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
1101
if(s < 0){
1177
ret_errno = errno;
1178
1102
perror_plus("socket");
1179
errno = ret_errno;
1180
1103
return false;
1181
1104
}
1182
1105
strcpy(ifr->ifr_name, ifname);
1183
1106
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
1107
if(ret == -1){
1185
1108
if(debug){
1186
ret_errno = errno;
1187
1109
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1189
1110
}
1190
1111
return false;
1191
1112
}
1197
1118
/* Reject the loopback device */
1198
1119
if(ifr->ifr_flags & IFF_LOOPBACK){
1199
1120
if(debug){
1200
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1201
ifname);
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1202
1123
}
1203
1124
return false;
1204
1125
}
1205
1126
/* Accept point-to-point devices only if connect_to is specified */
1206
1127
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1207
1128
if(debug){
1208
fprintf_plus(stderr, "Accepting point-to-point interface"
1209
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1210
1131
}
1211
1132
return true;
1212
1133
}
1213
1134
/* Otherwise, reject non-broadcast-capable devices */
1214
1135
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1215
1136
if(debug){
1216
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1217
" \"%s\"\n", ifname);
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1218
1139
}
1219
1140
return false;
1220
1141
}
1221
1142
/* Reject non-ARP interfaces (including dummy interfaces) */
1222
1143
if(ifr->ifr_flags & IFF_NOARP){
1223
1144
if(debug){
1224
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1225
ifname);
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1226
1146
}
1227
1147
return false;
1228
1148
}
1229
1149
1230
1150
/* Accept this device */
1231
1151
if(debug){
1232
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1233
1153
}
1234
1154
return true;
1235
1155
}
1240
1160
* (This function is passed to scandir(3) as a filter function.)
1241
1161
*/
1242
1162
int good_interface(const struct dirent *if_entry){
1163
int ret;
1243
1164
if(if_entry->d_name[0] == '.'){
1244
1165
return 0;
1245
1166
}
1246
1247
1167
struct ifreq ifr;
1168
1248
1169
if(not get_flags(if_entry->d_name, &ifr)){
1249
if(debug){
1250
fprintf_plus(stderr, "Failed to get flags for interface "
1251
"\"%s\"\n", if_entry->d_name);
1252
}
1253
1170
return 0;
1254
1171
}
1255
1172
1260
1177
}
1261
1178
1262
1179
/*
1263
* This function determines if a network interface is up.
1180
* This function determines if a directory entry in /sys/class/net
1181
* corresponds to an acceptable network device which is up.
1182
* (This function is passed to scandir(3) as a filter function.)
1264
1183
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1184
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1277
1252
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1253
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1289
1256
}
1290
1257
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1286
}
1287
return 1;
1292
1288
}
1293
1289
1294
1290
int notdotentries(const struct dirent *direntry){
1305
1301
/* Is this directory entry a runnable program? */
1306
1302
int runnable_hook(const struct dirent *direntry){
1307
1303
int ret;
1308
size_t sret;
1309
1304
struct stat st;
1310
1305
1311
1306
if((direntry->d_name)[0] == '\0'){
1313
1308
return 0;
1314
1309
}
1315
1310
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
"abcdefghijklmnopqrstuvwxyz"
1318
"0123456789"
1319
"_-");
1320
if((direntry->d_name)[sret] != '\0'){
1321
/* Contains non-allowed characters */
1322
if(debug){
1323
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
1337
1328
if(ret == -1){
1338
1329
if(debug){
1339
perror_plus("Could not stat hook");
1330
perror_plus("Could not stat plugin");
1340
1331
}
1341
1332
return 0;
1342
1333
}
1343
if(not (S_ISREG(st.st_mode))){
1334
if(not (st.st_mode & S_ISREG)){
1344
1335
/* Not a regular file */
1345
if(debug){
1346
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1347
direntry->d_name);
1348
}
1349
1336
return 0;
1350
1337
}
1351
1338
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1352
1339
/* Not executable */
1353
if(debug){
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1355
direntry->d_name);
1356
}
1357
1340
return 0;
1358
1341
}
1359
if(debug){
1360
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1361
direntry->d_name);
1362
}
1363
1342
return 1;
1364
1343
}
1365
1344
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1345
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1368
1346
int ret;
1369
1347
struct timespec now;
1370
1348
struct timespec waited_time;
1371
1349
intmax_t block_time;
1372
1350
1373
1351
while(true){
1374
if(mc->current_server == NULL){
1352
if(mc.current_server == NULL){
1375
1353
if (debug){
1376
fprintf_plus(stderr, "Wait until first server is found."
1377
" No timeout!\n");
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1378
1356
}
1379
1357
ret = avahi_simple_poll_iterate(s, -1);
1380
1358
} else {
1381
1359
if (debug){
1382
fprintf_plus(stderr, "Check current_server if we should run"
1383
" it, or wait\n");
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1384
1362
}
1385
1363
/* the current time */
1386
1364
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1391
1369
/* Calculating in ms how long time between now and server
1392
1370
who we visted longest time ago. Now - last seen. */
1393
1371
waited_time.tv_sec = (now.tv_sec
1394
- mc->current_server->last_seen.tv_sec);
1372
- mc.current_server->last_seen.tv_sec);
1395
1373
waited_time.tv_nsec = (now.tv_nsec
1396
- mc->current_server->last_seen.tv_nsec);
1374
- mc.current_server->last_seen.tv_nsec);
1397
1375
/* total time is 10s/10,000ms.
1398
1376
Converting to s from ms by dividing by 1,000,
1399
1377
and ns to ms by dividing by 1,000,000. */
1402
1380
- ((intmax_t)waited_time.tv_nsec / 1000000));
1403
1381
1404
1382
if (debug){
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1406
block_time);
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1407
1384
}
1408
1385
1409
1386
if(block_time <= 0){
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1387
ret = start_mandos_communication(mc.current_server->ip,
1388
mc.current_server->port,
1389
mc.current_server->if_index,
1390
mc.current_server->af);
1414
1391
if(ret == 0){
1415
avahi_simple_poll_quit(s);
1392
avahi_simple_poll_quit(mc.simple_poll);
1416
1393
return 0;
1417
1394
}
1418
1395
ret = clock_gettime(CLOCK_MONOTONIC,
1419
&mc->current_server->last_seen);
1396
&mc.current_server->last_seen);
1420
1397
if(ret == -1){
1421
1398
perror_plus("clock_gettime");
1422
1399
return -1;
1423
1400
}
1424
mc->current_server = mc->current_server->next;
1401
mc.current_server = mc.current_server->next;
1425
1402
block_time = 0; /* Call avahi to find new Mandos
1426
1403
servers, but don't block */
1427
1404
}
1429
1406
ret = avahi_simple_poll_iterate(s, (int)block_time);
1430
1407
}
1431
1408
if(ret != 0){
1432
if (ret > 0 or errno != EINTR){
1409
if (ret > 0 or errno != EINTR) {
1433
1410
return (ret != 1) ? ret : 0;
1434
1411
}
1435
1412
}
1436
1413
}
1437
1414
}
1438
1415
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
1492
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1496
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
1514
perror_plus("asprintf");
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
free(delaystring);
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
1585
} else {
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
1622
}
1623
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
1661
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1792
}
1793
1794
1416
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1799
1417
AvahiSServiceBrowser *sb = NULL;
1800
error_t ret_errno;
1418
int error;
1801
1419
int ret;
1802
1420
intmax_t tmpmax;
1803
1421
char *tmp;
1804
1422
int exitcode = EXIT_SUCCESS;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1423
const char *interface = "";
1424
struct ifreq network;
1425
int sd = -1;
1426
bool take_down_interface = false;
1427
uid_t uid;
1428
gid_t gid;
1807
1429
char tempdir[] = "/tmp/mandosXXXXXX";
1808
1430
bool tempdir_created = false;
1809
1431
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
1432
const char *seckey = PATHDIR "/" SECKEY;
1811
1433
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1813
1434
1814
1435
bool gnutls_initialized = false;
1815
1436
bool gpgme_initialized = false;
1877
1498
.group = 2 },
1878
1499
{ .name = "retry", .key = 132,
1879
1500
.arg = "SECONDS",
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",
1501
.doc = "Retry interval used when denied by the mandos server",
1885
1502
.group = 2 },
1886
1503
/*
1887
1504
* These reproduce what we would get without ARGP_NO_HELP
1906
1523
connect_to = arg;
1907
1524
break;
1908
1525
case 'i': /* --interface */
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
}
1526
interface = arg;
1914
1527
break;
1915
1528
case 's': /* --seckey */
1916
1529
seckey = arg;
1945
1558
argp_error(state, "Bad retry interval");
1946
1559
}
1947
1560
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1951
1561
/*
1952
1562
* These reproduce what we would get without ARGP_NO_HELP
1953
1563
*/
1959
1569
argp_state_help(state, state->out_stream,
1960
1570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
1571
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1572
fprintf(state->out_stream, "%s\n", argp_program_version);
1963
1573
exit(argp_err_exit_status);
1964
1574
break;
1965
1575
default:
1992
1602
{
1993
1603
/* Work around Debian bug #633582:
1994
1604
<http://bugs.debian.org/633582> */
1605
struct stat st;
1995
1606
1996
1607
/* Re-raise priviliges */
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");
1608
errno = 0;
1609
ret = seteuid(0);
1610
if(ret == -1){
1611
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1659
}
1660
}
1661
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
2070
1693
goto end;
2071
1694
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
1695
}
1696
close(devnull);
2079
1697
}
2080
1698
2081
1699
if(not debug){
2082
1700
avahi_set_log_function(empty_log);
2083
1701
}
2084
1702
1703
if(interface[0] == '\0'){
1704
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1706
alphasort);
1707
if(ret >= 1){
1708
/* Pick the first good interface */
1709
interface = strdup(direntries[0]->d_name);
1710
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1712
}
1713
if(interface == NULL){
1714
perror_plus("malloc");
1715
free(direntries);
1716
exitcode = EXIT_FAILURE;
1717
goto end;
1718
}
1719
free(direntries);
1720
} else {
1721
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1723
exitcode = EXIT_FAILURE;
1724
goto end;
1725
}
1726
}
1727
2085
1728
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2086
1729
from the signal handler */
2087
1730
/* Initialize the pseudo-RNG for Avahi */
2088
1731
srand((unsigned int) time(NULL));
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
2091
fprintf_plus(stderr,
2092
"Avahi: Failed to create simple poll object.\n");
1732
mc.simple_poll = avahi_simple_poll_new();
1733
if(mc.simple_poll == NULL){
1734
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2093
1735
exitcode = EX_UNAVAILABLE;
2094
1736
goto end;
2095
1737
}
2157
1799
}
2158
1800
}
2159
1801
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
1802
/* If the interface is down, bring it up */
1803
if(strcmp(interface, "none") != 0){
1804
if_index = (AvahiIfIndex) if_nametoindex(interface);
1805
if(if_index == 0){
1806
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1807
exitcode = EX_UNAVAILABLE;
1808
goto end;
1809
}
1810
1811
if(quit_now){
1812
goto end;
1813
}
1814
1815
/* Re-raise priviliges */
1816
errno = 0;
1817
ret = seteuid(0);
1818
if(ret == -1){
1819
perror_plus("seteuid");
1820
}
1821
1822
#ifdef __linux__
1823
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1824
messages about the network interface to mess up the prompt */
1825
ret = klogctl(8, NULL, 5);
1826
bool restore_loglevel = true;
1827
if(ret == -1){
1828
restore_loglevel = false;
1829
perror_plus("klogctl");
1830
}
1831
#endif /* __linux__ */
1832
1833
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1834
if(sd < 0){
1835
perror_plus("socket");
1836
exitcode = EX_OSERR;
1837
#ifdef __linux__
1838
if(restore_loglevel){
1839
ret = klogctl(7, NULL, 0);
1840
if(ret == -1){
1841
perror_plus("klogctl");
1842
}
1843
}
1844
#endif /* __linux__ */
1845
/* Lower privileges */
1846
errno = 0;
1847
ret = seteuid(uid);
1848
if(ret == -1){
1849
perror_plus("seteuid");
1850
}
1851
goto end;
1852
}
1853
strcpy(network.ifr_name, interface);
1854
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1855
if(ret == -1){
1856
perror_plus("ioctl SIOCGIFFLAGS");
1857
#ifdef __linux__
1858
if(restore_loglevel){
1859
ret = klogctl(7, NULL, 0);
1860
if(ret == -1){
1861
perror_plus("klogctl");
1862
}
1863
}
1864
#endif /* __linux__ */
1865
exitcode = EX_OSERR;
1866
/* Lower privileges */
1867
errno = 0;
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
goto end;
1873
}
1874
if((network.ifr_flags & IFF_UP) == 0){
1875
network.ifr_flags |= IFF_UP;
1876
take_down_interface = true;
1877
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1878
if(ret == -1){
1879
take_down_interface = false;
1880
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1881
exitcode = EX_OSERR;
1882
#ifdef __linux__
1883
if(restore_loglevel){
1884
ret = klogctl(7, NULL, 0);
1885
if(ret == -1){
1886
perror_plus("klogctl");
1887
}
1888
}
1889
#endif /* __linux__ */
1890
/* Lower privileges */
1891
errno = 0;
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
goto end;
1897
}
1898
}
1899
/* Sleep checking until interface is running.
1900
Check every 0.25s, up to total time of delay */
1901
for(int i=0; i < delay * 4; i++){
1902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1903
if(ret == -1){
1904
perror_plus("ioctl SIOCGIFFLAGS");
1905
} else if(network.ifr_flags & IFF_RUNNING){
1906
break;
1907
}
1908
struct timespec sleeptime = { .tv_nsec = 250000000 };
1909
ret = nanosleep(&sleeptime, NULL);
1910
if(ret == -1 and errno != EINTR){
1911
perror_plus("nanosleep");
1912
}
1913
}
1914
if(not take_down_interface){
1915
/* We won't need the socket anymore */
1916
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1917
if(ret == -1){
1918
perror_plus("close");
1919
}
1920
}
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
/* Restores kernel loglevel to default */
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
if(take_down_interface){
1933
/* Lower privileges */
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
2182
1938
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
}
2208
}
2209
break;
2210
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1939
/* Lower privileges permanently */
1940
ret = setuid(uid);
1941
if(ret == -1){
1942
perror_plus("setuid");
1943
}
1944
}
2240
1945
}
2241
1946
2242
1947
if(quit_now){
2243
1948
goto end;
2244
1949
}
2245
1950
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
1951
ret = init_gnutls_global(pubkey, seckey);
2247
1952
if(ret == -1){
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
1953
fprintf(stderr, "init_gnutls_global failed\n");
2249
1954
exitcode = EX_UNAVAILABLE;
2250
1955
goto end;
2251
1956
} else {
2266
1971
goto end;
2267
1972
}
2268
1973
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2270
fprintf_plus(stderr, "init_gpgme failed\n");
1974
if(not init_gpgme(pubkey, seckey, tempdir)){
1975
fprintf(stderr, "init_gpgme failed\n");
2271
1976
exitcode = EX_UNAVAILABLE;
2272
1977
goto end;
2273
1978
} else {
2282
1987
/* Connect directly, do not use Zeroconf */
2283
1988
/* (Mainly meant for debugging) */
2284
1989
char *address = strrchr(connect_to, ':');
2285
2286
1990
if(address == NULL){
2287
fprintf_plus(stderr, "No colon in address\n");
1991
fprintf(stderr, "No colon in address\n");
2288
1992
exitcode = EX_USAGE;
2289
1993
goto end;
2290
1994
}
2293
1997
goto end;
2294
1998
}
2295
1999
2296
in_port_t port;
2000
uint16_t port;
2297
2001
errno = 0;
2298
2002
tmpmax = strtoimax(address+1, &tmp, 10);
2299
2003
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2300
or tmpmax != (in_port_t)tmpmax){
2301
fprintf_plus(stderr, "Bad port number\n");
2004
or tmpmax != (uint16_t)tmpmax){
2005
fprintf(stderr, "Bad port number\n");
2302
2006
exitcode = EX_USAGE;
2303
2007
goto end;
2304
2008
}
2305
2009
2306
2010
if(quit_now){
2307
2011
goto end;
2308
2012
}
2309
2013
2310
port = (in_port_t)tmpmax;
2014
port = (uint16_t)tmpmax;
2311
2015
*address = '\0';
2312
2016
/* Colon in address indicates IPv6 */
2313
2017
int af;
2329
2033
}
2330
2034
2331
2035
while(not quit_now){
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
2036
ret = start_mandos_communication(address, port, if_index, af);
2334
2037
if(quit_now or ret == 0){
2335
2038
break;
2336
2039
}
2337
2040
if(debug){
2338
fprintf_plus(stderr, "Retrying in %d seconds\n",
2339
(int)retry_interval);
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2340
2043
}
2341
sleep((unsigned int)retry_interval);
2044
sleep((int)retry_interval);
2342
2045
}
2343
2046
2344
2047
if (not quit_now){
2362
2065
config.publish_domain = 0;
2363
2066
2364
2067
/* Allocate a new server */
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
2068
mc.server = avahi_server_new(avahi_simple_poll_get
2069
(mc.simple_poll), &config, NULL,
2070
NULL, &error);
2367
2071
2368
2072
/* Free the Avahi configuration data */
2369
2073
avahi_server_config_free(&config);
2371
2075
2372
2076
/* Check if creating the Avahi server object succeeded */
2373
2077
if(mc.server == NULL){
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
2078
fprintf(stderr, "Failed to create Avahi server: %s\n",
2079
avahi_strerror(error));
2376
2080
exitcode = EX_UNAVAILABLE;
2377
2081
goto end;
2378
2082
}
2384
2088
/* Create the Avahi service browser */
2385
2089
sb = avahi_s_service_browser_new(mc.server, if_index,
2386
2090
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
2091
NULL, 0, browse_callback, NULL);
2389
2092
if(sb == NULL){
2390
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
avahi_strerror(avahi_server_errno(mc.server)));
2093
fprintf(stderr, "Failed to create service browser: %s\n",
2094
avahi_strerror(avahi_server_errno(mc.server)));
2392
2095
exitcode = EX_UNAVAILABLE;
2393
2096
goto end;
2394
2097
}
2400
2103
/* Run the main loop */
2401
2104
2402
2105
if(debug){
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2106
fprintf(stderr, "Starting Avahi loop search\n");
2404
2107
}
2405
2108
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
2109
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
(int)(retry_interval * 1000));
2408
2111
if(debug){
2409
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2410
(ret == 0) ? "successfully" : "with error");
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2411
2114
}
2412
2115
2413
2116
end:
2414
2117
2415
2118
if(debug){
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2119
fprintf(stderr, "%s exiting\n", argv[0]);
2417
2120
}
2418
2121
2419
2122
/* Cleanup things */
2420
free(mc.interfaces);
2421
2422
2123
if(sb != NULL)
2423
2124
avahi_s_service_browser_free(sb);
2424
2125
2425
2126
if(mc.server != NULL)
2426
2127
avahi_server_free(mc.server);
2427
2128
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
2129
if(mc.simple_poll != NULL)
2130
avahi_simple_poll_free(mc.simple_poll);
2430
2131
2431
2132
if(gnutls_initialized){
2432
2133
gnutls_certificate_free_credentials(mc.cred);
2437
2138
if(gpgme_initialized){
2438
2139
gpgme_release(mc.ctx);
2439
2140
}
2440
2141
2441
2142
/* Cleans up the circular linked list of Mandos servers the client
2442
2143
has seen */
2443
2144
if(mc.current_server != NULL){
2449
2150
}
2450
2151
}
2451
2152
2452
/* Re-raise priviliges */
2453
{
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2153
/* XXX run network hooks "stop" here */
2154
2155
/* Take down the network interface */
2156
if(take_down_interface){
2157
/* Re-raise priviliges */
2158
errno = 0;
2159
ret = seteuid(0);
2160
if(ret == -1){
2161
perror_plus("seteuid");
2162
}
2163
if(geteuid() == 0){
2164
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
if(ret == -1){
2166
perror_plus("ioctl SIOCGIFFLAGS");
2167
} else if(network.ifr_flags & IFF_UP) {
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
if(ret == -1){
2171
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2470
2172
}
2471
2173
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2174
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2175
if(ret == -1){
2176
perror_plus("close");
2177
}
2178
/* Lower privileges permanently */
2179
errno = 0;
2180
ret = setuid(uid);
2181
if(ret == -1){
2182
perror_plus("setuid");
2475
2183
}
2476
2184
}
2477
2478
lower_privileges_permanently();
2479
2185
}
2480
2186
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2483
2484
2187
/* Removes the GPGME temp directory and all files inside */
2485
2188
if(tempdir_created){
2486
2189
struct dirent **direntries = NULL;
2499
2202
}
2500
2203
ret = remove(fullname);
2501
2204
if(ret == -1){
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
2205
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2206
strerror(errno));
2504
2207
}
2505
2208
free(fullname);
2506
2209
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0