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- Committer: Teddy Hogeborn
- Date: 2015-07-06 20:09:47 UTC
- mto: This revision was merged to the branch mainline in revision 759.
- Revision ID: teddy@recompile.se-20150706200947-w21u4eq74efgl6r5
Fix minor bugs and typos and add some more debug output.
* Makefile (install-client-nokey): Create plugin-helpers directory and
the mandos-client-iprouteadddel
helper program.
* initramfs-tools-hook (PLUGINHELPERDIR): Fix typo.
* plugins.d/mandos-client.c: Change terminology; routes are "deleted",
not "removed". All occurences changed.
(add_remove_local_route): Renamed to "add_delete_local_route". All
callers changed. Also pass "--debug" flag
to helper if in debug mode.
(add_local_route): Add debugging output.
(remove_local_route): Renamed to "delete_local_route". All callers
changed. Also pass "--debug" flag to helper
if in debug mode.
(start_mandos_communication): Add debug output when adding route.
* Makefile (install-client-nokey): Create plugin-helpers directory and
the mandos-client-iprouteadddel
helper program.
* initramfs-tools-hook (PLUGINHELPERDIR): Fix typo.
* plugins.d/mandos-client.c: Change terminology; routes are "deleted",
not "removed". All occurences changed.
(add_remove_local_route): Renamed to "add_delete_local_route". All
callers changed. Also pass "--debug" flag
to helper if in debug mode.
(add_local_route): Add debugging output.
(remove_local_route): Renamed to "delete_local_route". All callers
changed. Also pass "--debug" flag to helper
if in debug mode.
(start_mandos_communication): Add debug output when adding route.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
90
98
91
99
#ifdef __linux__
92
100
#include <sys/klog.h> /* klogctl() */
134
142
static const char sys_class_net[] = "/sys/class/net";
135
143
char *connect_to = NULL;
136
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
137
148
138
149
/* Doubly linked list that need to be circularly linked when used */
139
150
typedef struct server{
140
151
const char *ip;
141
uint16_t port;
152
in_port_t port;
142
153
AvahiIfIndex if_index;
143
154
int af;
144
155
struct timespec last_seen;
148
159
149
160
/* Used for passing in values through the Avahi callback functions */
150
161
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
162
AvahiServer *server;
153
163
gnutls_certificate_credentials_t cred;
154
164
unsigned int dh_bits;
156
166
const char *priority;
157
167
gpgme_ctx_t ctx;
158
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
159
171
} mandos_context;
160
172
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
166
175
167
176
sig_atomic_t quit_now = 0;
168
177
int signal_received = 0;
169
178
170
179
/* Function to use when printing errors */
171
180
void perror_plus(const char *print_text){
181
int e = errno;
172
182
fprintf(stderr, "Mandos plugin %s: ",
173
183
program_invocation_short_name);
184
errno = e;
174
185
perror(print_text);
175
186
}
176
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
177
198
/*
178
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
200
* bytes. "buffer_capacity" is how much is currently allocated,
180
201
* "buffer_length" is how much is already used.
181
202
*/
203
__attribute__((nonnull, warn_unused_result))
182
204
size_t incbuffer(char **buffer, size_t buffer_length,
183
205
size_t buffer_capacity){
184
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
187
213
return 0;
188
214
}
215
*buffer = new_buf;
189
216
buffer_capacity += BUFFER_SIZE;
190
217
}
191
218
return buffer_capacity;
192
219
}
193
220
194
221
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
197
225
int ret;
198
226
server *new_server = malloc(sizeof(server));
199
227
if(new_server == NULL){
200
228
perror_plus("malloc");
201
return -1;
229
return false;
202
230
}
203
231
*new_server = (server){ .ip = strdup(ip),
204
232
.port = port,
206
234
.af = af };
207
235
if(new_server->ip == NULL){
208
236
perror_plus("strdup");
209
return -1;
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
210
253
}
211
254
/* Special case of first server */
212
if (mc.current_server == NULL){
255
if(*current_server == NULL){
213
256
new_server->next = new_server;
214
257
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
258
*current_server = new_server;
217
259
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
220
263
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
229
267
}
230
268
231
269
/*
232
270
* Initialize GPGME.
233
271
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
236
277
gpgme_error_t rc;
237
278
gpgme_engine_info_t engine_info;
238
279
239
240
280
/*
241
281
* Helper function to insert pub and seckey to the engine keyring.
242
282
*/
243
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
244
284
int ret;
245
285
int fd;
246
286
gpgme_data_t pgp_data;
253
293
254
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
295
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
259
298
return false;
260
299
}
261
300
262
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
263
302
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
267
305
return false;
268
306
}
269
307
276
314
}
277
315
278
316
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
281
318
}
282
319
283
320
/* Init GPGME */
284
321
gpgme_check_version(NULL);
285
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
323
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
290
326
return false;
291
327
}
292
328
293
329
/* Set GPGME home directory for the OpenPGP engine only */
294
330
rc = gpgme_get_engine_info(&engine_info);
295
331
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
299
334
return false;
300
335
}
301
336
while(engine_info != NULL){
307
342
engine_info = engine_info->next;
308
343
}
309
344
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
312
347
return false;
313
348
}
314
349
315
350
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
317
352
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
321
356
return false;
322
357
}
323
358
332
367
* Decrypt OpenPGP data.
333
368
* Returns -1 on error
334
369
*/
370
__attribute__((nonnull, warn_unused_result))
335
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
372
size_t crypto_size,
337
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
338
375
gpgme_data_t dh_crypto, dh_plain;
339
376
gpgme_error_t rc;
340
377
ssize_t ret;
342
379
ssize_t plaintext_length = 0;
343
380
344
381
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
383
}
348
384
349
385
/* Create new GPGME data buffer from memory cryptotext */
350
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
387
0);
352
388
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
356
391
return -1;
357
392
}
358
393
359
394
/* Create new empty GPGME data buffer for the plaintext */
360
395
rc = gpgme_data_new(&dh_plain);
361
396
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
365
400
gpgme_data_release(dh_crypto);
366
401
return -1;
367
402
}
368
403
369
404
/* Decrypt data from the cryptotext data buffer to the plaintext
370
405
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
407
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
376
410
plaintext_length = -1;
377
411
if(debug){
378
412
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
380
414
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
416
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
390
421
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
423
}
394
424
gpgme_recipient_t recipient;
395
425
recipient = result->recipients;
396
426
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
406
434
recipient = recipient->next;
407
435
}
408
436
}
411
439
}
412
440
413
441
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
443
}
417
444
418
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
449
476
}
450
477
451
478
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
454
480
for(ssize_t i = 0; i < plaintext_length; i++){
455
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
482
}
467
493
return plaintext_length;
468
494
}
469
495
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
473
499
if(ret == NULL)
474
500
ret = "(unknown)";
475
501
return ret;
476
502
}
477
503
478
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
479
506
static void debuggnutls(__attribute__((unused)) int level,
480
507
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
482
509
}
483
510
511
__attribute__((nonnull, warn_unused_result))
484
512
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
486
515
int ret;
487
516
488
517
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
519
}
492
520
493
521
ret = gnutls_global_init();
494
522
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
497
525
return -1;
498
526
}
499
527
506
534
}
507
535
508
536
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
538
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
513
541
gnutls_global_deinit();
514
542
return -1;
515
543
}
516
544
517
545
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
522
550
}
523
551
524
552
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
526
554
GNUTLS_OPENPGP_FMT_BASE64);
527
555
if(ret != GNUTLS_E_SUCCESS){
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
534
561
goto globalfail;
535
562
}
536
563
537
564
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
539
566
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
543
570
goto globalfail;
544
571
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
573
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
550
576
goto globalfail;
551
577
}
552
578
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
580
555
581
return 0;
556
582
557
583
globalfail:
558
584
559
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
560
586
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
562
588
return -1;
563
589
}
564
590
565
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
566
594
int ret;
567
595
/* GnuTLS session creation */
568
596
do {
572
600
}
573
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
602
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
578
606
}
579
607
580
608
{
581
609
const char *err;
582
610
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
612
if(quit_now){
585
613
gnutls_deinit(*session);
586
614
return -1;
587
615
}
588
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
617
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
594
621
gnutls_deinit(*session);
595
622
return -1;
596
623
}
598
625
599
626
do {
600
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
628
mc->cred);
602
629
if(quit_now){
603
630
gnutls_deinit(*session);
604
631
return -1;
605
632
}
606
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
634
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
611
637
gnutls_deinit(*session);
612
638
return -1;
613
639
}
615
641
/* ignore client certificate if any. */
616
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
617
643
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
645
620
646
return 0;
621
647
}
624
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
625
651
__attribute__((unused)) const char *txt){}
626
652
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and delete_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_delete_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char debug_flag[] = "--debug";
715
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
716
if(pluginhelperdir == NULL){
717
if(debug){
718
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
719
" variable not set; cannot run helper\n");
720
}
721
return false;
722
}
723
724
char interface[IF_NAMESIZE];
725
if(if_indextoname((unsigned int)if_index, interface) == NULL){
726
perror_plus("if_indextoname");
727
return false;
728
}
729
730
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
if(devnull == -1){
732
perror_plus("open(\"/dev/null\", O_RDONLY)");
733
return false;
734
}
735
pid_t pid = fork();
736
if(pid == 0){
737
/* Child */
738
/* Raise privileges */
739
errno = raise_privileges_permanently();
740
if(errno != 0){
741
perror_plus("Failed to raise privileges");
742
/* _exit(EX_NOPERM); */
743
} else {
744
/* Set group */
745
errno = 0;
746
ret = setgid(0);
747
if(ret == -1){
748
perror_plus("setgid");
749
_exit(EX_NOPERM);
750
}
751
/* Reset supplementary groups */
752
errno = 0;
753
ret = setgroups(0, NULL);
754
if(ret == -1){
755
perror_plus("setgroups");
756
_exit(EX_NOPERM);
757
}
758
}
759
ret = dup2(devnull, STDIN_FILENO);
760
if(ret == -1){
761
perror_plus("dup2(devnull, STDIN_FILENO)");
762
_exit(EX_OSERR);
763
}
764
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
765
if(ret == -1){
766
perror_plus("close");
767
_exit(EX_OSERR);
768
}
769
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
if(ret == -1){
771
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
772
_exit(EX_OSERR);
773
}
774
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
775
O_RDONLY
776
| O_DIRECTORY
777
| O_PATH
778
| O_CLOEXEC));
779
if(helperdir_fd == -1){
780
perror_plus("open");
781
_exit(EX_UNAVAILABLE);
782
}
783
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
784
helper, O_RDONLY));
785
if(helper_fd == -1){
786
perror_plus("openat");
787
_exit(EX_UNAVAILABLE);
788
}
789
TEMP_FAILURE_RETRY(close(helperdir_fd));
790
#ifdef __GNUC__
791
#pragma GCC diagnostic push
792
#pragma GCC diagnostic ignored "-Wcast-qual"
793
#endif
794
if(fexecve(helper_fd, (char *const [])
795
{ helper, add ? add_arg : delete_arg, (char *)address,
796
interface, debug ? debug_flag : NULL, NULL },
797
environ) == -1){
798
#ifdef __GNUC__
799
#pragma GCC diagnostic pop
800
#endif
801
perror_plus("fexecve");
802
_exit(EXIT_FAILURE);
803
}
804
}
805
if(pid == -1){
806
perror_plus("fork");
807
return false;
808
}
809
int status;
810
pid_t pret = -1;
811
errno = 0;
812
do {
813
pret = waitpid(pid, &status, 0);
814
if(pret == -1 and errno == EINTR and quit_now){
815
int errno_raising = 0;
816
if((errno = raise_privileges()) != 0){
817
errno_raising = errno;
818
perror_plus("Failed to raise privileges in order to"
819
" kill helper program");
820
}
821
if(kill(pid, SIGTERM) == -1){
822
perror_plus("kill");
823
}
824
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
825
perror_plus("Failed to lower privileges after killing"
826
" helper program");
827
}
828
return false;
829
}
830
} while(pret == -1 and errno == EINTR);
831
if(pret == -1){
832
perror_plus("waitpid");
833
return false;
834
}
835
if(WIFEXITED(status)){
836
if(WEXITSTATUS(status) != 0){
837
fprintf_plus(stderr, "Error: iprouteadddel exited"
838
" with status %d\n", WEXITSTATUS(status));
839
return false;
840
}
841
return true;
842
}
843
if(WIFSIGNALED(status)){
844
fprintf_plus(stderr, "Error: iprouteadddel died by"
845
" signal %d\n", WTERMSIG(status));
846
return false;
847
}
848
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
849
return false;
850
}
851
852
__attribute__((nonnull, warn_unused_result))
853
static bool add_local_route(const char *address,
854
AvahiIfIndex if_index){
855
if(debug){
856
fprintf_plus(stderr, "Adding route to %s\n", address);
857
}
858
return add_delete_local_route(true, address, if_index);
859
}
860
861
__attribute__((nonnull, warn_unused_result))
862
static bool delete_local_route(const char *address,
863
AvahiIfIndex if_index){
864
if(debug){
865
fprintf_plus(stderr, "Removing route to %s\n", address);
866
}
867
return add_delete_local_route(false, address, if_index);
868
}
869
627
870
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
871
__attribute__((nonnull, warn_unused_result))
872
static int start_mandos_communication(const char *ip, in_port_t port,
629
873
AvahiIfIndex if_index,
630
int af){
874
int af, mandos_context *mc){
631
875
int ret, tcp_sd = -1;
632
876
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
877
struct sockaddr_storage to;
637
878
char *buffer = NULL;
638
879
char *decrypted_buffer = NULL;
639
880
size_t buffer_length = 0;
642
883
int retval = -1;
643
884
gnutls_session_t session;
644
885
int pf; /* Protocol family */
886
bool route_added = false;
645
887
646
888
errno = 0;
647
889
658
900
pf = PF_INET;
659
901
break;
660
902
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
903
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
904
errno = EINVAL;
664
905
return -1;
665
906
}
666
907
667
ret = init_gnutls_session(&session);
908
/* If the interface is specified and we have a list of interfaces */
909
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
910
/* Check if the interface is one of the interfaces we are using */
911
bool match = false;
912
{
913
char *interface = NULL;
914
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
915
interface))){
916
if(if_nametoindex(interface) == (unsigned int)if_index){
917
match = true;
918
break;
919
}
920
}
921
}
922
if(not match){
923
/* This interface does not match any in the list, so we don't
924
connect to the server */
925
if(debug){
926
char interface[IF_NAMESIZE];
927
if(if_indextoname((unsigned int)if_index, interface) == NULL){
928
perror_plus("if_indextoname");
929
} else {
930
fprintf_plus(stderr, "Skipping server on non-used interface"
931
" \"%s\"\n",
932
if_indextoname((unsigned int)if_index,
933
interface));
934
}
935
}
936
return -1;
937
}
938
}
939
940
ret = init_gnutls_session(&session, mc);
668
941
if(ret != 0){
669
942
return -1;
670
943
}
671
944
672
945
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
946
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
947
PRIuMAX "\n", ip, (uintmax_t)port);
676
948
}
677
949
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
950
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
679
951
if(tcp_sd < 0){
680
952
int e = errno;
681
953
perror_plus("socket");
690
962
691
963
memset(&to, 0, sizeof(to));
692
964
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
965
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
966
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
695
967
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
968
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
969
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
698
970
}
699
971
if(ret < 0 ){
700
972
int e = errno;
704
976
}
705
977
if(ret == 0){
706
978
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
979
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
980
errno = e;
710
981
goto mandos_end;
711
982
}
712
983
if(af == AF_INET6){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
984
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
985
if(IN6_IS_ADDR_LINKLOCAL
986
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
720
987
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
988
fprintf_plus(stderr, "An IPv6 link-local address is"
989
" incomplete without a network interface\n");
724
990
errno = EINVAL;
725
991
goto mandos_end;
726
992
}
727
993
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
994
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
729
995
}
730
996
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
997
((struct sockaddr_in *)&to)->sin_port = htons(port);
734
998
}
735
999
736
1000
if(quit_now){
744
1008
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
1009
perror_plus("if_indextoname");
746
1010
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
1011
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1012
"\n", ip, interface, (uintmax_t)port);
750
1013
}
751
1014
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1015
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1016
ip, (uintmax_t)port);
754
1017
}
755
1018
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
1019
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
761
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
764
}
765
if(pcret == NULL){
766
perror_plus("inet_ntop");
767
} else {
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
771
}
772
}
773
}
774
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
782
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
}
785
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
1020
if(af == AF_INET6){
1021
ret = getnameinfo((struct sockaddr *)&to,
1022
sizeof(struct sockaddr_in6),
1023
addrstr, sizeof(addrstr), NULL, 0,
1024
NI_NUMERICHOST);
1025
} else {
1026
ret = getnameinfo((struct sockaddr *)&to,
1027
sizeof(struct sockaddr_in),
1028
addrstr, sizeof(addrstr), NULL, 0,
1029
NI_NUMERICHOST);
1030
}
1031
if(ret == EAI_SYSTEM){
1032
perror_plus("getnameinfo");
1033
} else if(ret != 0) {
1034
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1035
} else if(strcmp(addrstr, ip) != 0){
1036
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1037
}
1038
}
1039
1040
if(quit_now){
1041
errno = EINTR;
1042
goto mandos_end;
1043
}
1044
1045
while(true){
1046
if(af == AF_INET6){
1047
ret = connect(tcp_sd, (struct sockaddr *)&to,
1048
sizeof(struct sockaddr_in6));
1049
} else {
1050
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1051
sizeof(struct sockaddr_in));
1052
}
1053
if(ret < 0){
1054
if(errno == ENETUNREACH
1055
and if_index != AVAHI_IF_UNSPEC
1056
and connect_to == NULL
1057
and not route_added and
1058
((af == AF_INET6 and not
1059
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1060
&to)->sin6_addr)))
1061
or (af == AF_INET and
1062
/* Not a a IPv4LL address */
1063
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1064
& 0xFFFF0000L) != 0xA9FE0000L))){
1065
/* Work around Avahi bug - Avahi does not announce link-local
1066
addresses if it has a global address, so local hosts with
1067
*only* a link-local address (e.g. Mandos clients) cannot
1068
connect to a Mandos server announced by Avahi on a server
1069
host with a global address. Work around this by retrying
1070
with an explicit route added with the server's address.
1071
1072
Avahi bug reference:
1073
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1074
https://bugs.debian.org/587961
1075
*/
1076
if(debug){
1077
fprintf_plus(stderr, "Mandos server unreachable, trying"
1078
" direct route\n");
1079
}
1080
int e = errno;
1081
route_added = add_local_route(ip, if_index);
1082
if(route_added){
1083
continue;
1084
}
1085
errno = e;
1086
}
1087
if(errno != ECONNREFUSED or debug){
1088
int e = errno;
1089
perror_plus("connect");
1090
errno = e;
1091
}
1092
goto mandos_end;
1093
}
1094
1095
if(quit_now){
1096
errno = EINTR;
1097
goto mandos_end;
1098
}
1099
break;
797
1100
}
798
1101
799
1102
const char *out = mandos_protocol_version;
827
1130
}
828
1131
829
1132
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
1133
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
1134
}
833
1135
834
1136
if(quit_now){
836
1138
goto mandos_end;
837
1139
}
838
1140
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1141
/* This casting via intptr_t is to eliminate warning about casting
1142
an int to a pointer type. This is exactly how the GnuTLS Guile
1143
function "set-session-transport-fd!" does it. */
1144
gnutls_transport_set_ptr(session,
1145
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
1146
842
1147
if(quit_now){
843
1148
errno = EINTR;
854
1159
855
1160
if(ret != GNUTLS_E_SUCCESS){
856
1161
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
1162
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
1163
gnutls_perror(ret);
860
1164
}
861
1165
errno = EPROTO;
865
1169
/* Read OpenPGP packet that contains the wanted password */
866
1170
867
1171
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
1172
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1173
" %s\n", ip);
870
1174
}
871
1175
872
1176
while(true){
910
1214
}
911
1215
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
1216
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
1217
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1218
"***\n");
915
1219
gnutls_perror(ret);
916
1220
errno = EPROTO;
917
1221
goto mandos_end;
918
1222
}
919
1223
break;
920
1224
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
1225
fprintf_plus(stderr, "Unknown error while reading data from"
1226
" encrypted session with Mandos server\n");
924
1227
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
1228
errno = EIO;
926
1229
goto mandos_end;
931
1234
}
932
1235
933
1236
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
1237
fprintf_plus(stderr, "Closing TLS session\n");
936
1238
}
937
1239
938
1240
if(quit_now){
951
1253
if(buffer_length > 0){
952
1254
ssize_t decrypted_buffer_size;
953
1255
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
1256
&decrypted_buffer, mc);
955
1257
if(decrypted_buffer_size >= 0){
956
1258
957
1259
written = 0;
967
1269
if(ret == 0 and ferror(stdout)){
968
1270
int e = errno;
969
1271
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
1272
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1273
strerror(errno));
973
1274
}
974
1275
errno = e;
975
1276
goto mandos_end;
984
1285
985
1286
mandos_end:
986
1287
{
1288
if(route_added){
1289
if(not delete_local_route(ip, if_index)){
1290
fprintf_plus(stderr, "Failed to delete local route to %s on"
1291
" interface %d", ip, if_index);
1292
}
1293
}
987
1294
int e = errno;
988
1295
free(decrypted_buffer);
989
1296
free(buffer);
1006
1313
return retval;
1007
1314
}
1008
1315
1316
__attribute__((nonnull))
1009
1317
static void resolve_callback(AvahiSServiceResolver *r,
1010
1318
AvahiIfIndex interface,
1011
1319
AvahiProtocol proto,
1019
1327
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1328
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1329
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1330
void *mc){
1331
if(r == NULL){
1332
return;
1333
}
1024
1334
1025
1335
/* Called whenever a service has been resolved successfully or
1026
1336
timed out */
1027
1337
1028
1338
if(quit_now){
1339
avahi_s_service_resolver_free(r);
1029
1340
return;
1030
1341
}
1031
1342
1032
1343
switch(event){
1033
1344
default:
1034
1345
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
avahi_strerror(avahi_server_errno(mc.server)));
1346
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1347
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1348
domain,
1349
avahi_strerror(avahi_server_errno
1350
(((mandos_context*)mc)->server)));
1039
1351
break;
1040
1352
1041
1353
case AVAHI_RESOLVER_FOUND:
1043
1355
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1356
avahi_address_snprint(ip, sizeof(ip), address);
1045
1357
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
ip, (intmax_t)interface, port);
1358
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1359
PRIdMAX ") on port %" PRIu16 "\n", name,
1360
host_name, ip, (intmax_t)interface, port);
1050
1361
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1362
int ret = start_mandos_communication(ip, (in_port_t)port,
1363
interface,
1364
avahi_proto_to_af(proto),
1365
mc);
1053
1366
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1367
avahi_simple_poll_quit(simple_poll);
1055
1368
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1369
if(not add_server(ip, (in_port_t)port, interface,
1370
avahi_proto_to_af(proto),
1371
&((mandos_context*)mc)->current_server)){
1372
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1373
" list\n", name);
1374
}
1058
1375
}
1059
1376
}
1060
1377
}
1070
1387
const char *domain,
1071
1388
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1389
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1390
void *mc){
1391
if(b == NULL){
1392
return;
1393
}
1075
1394
1076
1395
/* Called whenever a new services becomes available on the LAN or
1077
1396
is removed from the LAN */
1084
1403
default:
1085
1404
case AVAHI_BROWSER_FAILURE:
1086
1405
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
1089
avahi_strerror(avahi_server_errno(mc.server)));
1090
avahi_simple_poll_quit(mc.simple_poll);
1406
fprintf_plus(stderr, "(Avahi browser) %s\n",
1407
avahi_strerror(avahi_server_errno
1408
(((mandos_context*)mc)->server)));
1409
avahi_simple_poll_quit(simple_poll);
1091
1410
return;
1092
1411
1093
1412
case AVAHI_BROWSER_NEW:
1096
1415
the callback function is called the Avahi server will free the
1097
1416
resolver for us. */
1098
1417
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
name, type, domain, protocol, 0,
1101
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
1418
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1419
interface, protocol, name, type,
1420
domain, protocol, 0,
1421
resolve_callback, mc) == NULL)
1422
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1423
" %s\n", name,
1424
avahi_strerror(avahi_server_errno
1425
(((mandos_context*)mc)->server)));
1105
1426
break;
1106
1427
1107
1428
case AVAHI_BROWSER_REMOVE:
1110
1431
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1432
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1433
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1434
fprintf_plus(stderr, "No Mandos server found, still"
1435
" searching...\n");
1115
1436
}
1116
1437
break;
1117
1438
}
1126
1447
signal_received = sig;
1127
1448
int old_errno = errno;
1128
1449
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1450
if(simple_poll != NULL){
1451
avahi_simple_poll_quit(simple_poll);
1131
1452
}
1132
1453
errno = old_errno;
1133
1454
}
1134
1455
1456
__attribute__((nonnull, warn_unused_result))
1135
1457
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1458
int ret;
1459
error_t ret_errno;
1137
1460
1138
1461
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1462
if(s < 0){
1463
ret_errno = errno;
1140
1464
perror_plus("socket");
1465
errno = ret_errno;
1141
1466
return false;
1142
1467
}
1143
1468
strcpy(ifr->ifr_name, ifname);
1144
1469
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1470
if(ret == -1){
1146
1471
if(debug){
1472
ret_errno = errno;
1147
1473
perror_plus("ioctl SIOCGIFFLAGS");
1474
errno = ret_errno;
1148
1475
}
1149
1476
return false;
1150
1477
}
1151
1478
return true;
1152
1479
}
1153
1480
1481
__attribute__((nonnull, warn_unused_result))
1154
1482
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1483
1156
1484
/* Reject the loopback device */
1157
1485
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1486
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1487
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1488
ifname);
1161
1489
}
1162
1490
return false;
1163
1491
}
1164
1492
/* Accept point-to-point devices only if connect_to is specified */
1165
1493
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1494
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1495
fprintf_plus(stderr, "Accepting point-to-point interface"
1496
" \"%s\"\n", ifname);
1169
1497
}
1170
1498
return true;
1171
1499
}
1172
1500
/* Otherwise, reject non-broadcast-capable devices */
1173
1501
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1502
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1503
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1504
" \"%s\"\n", ifname);
1177
1505
}
1178
1506
return false;
1179
1507
}
1180
1508
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1509
if(ifr->ifr_flags & IFF_NOARP){
1182
1510
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1511
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1512
ifname);
1185
1513
}
1186
1514
return false;
1187
1515
}
1188
1516
1189
1517
/* Accept this device */
1190
1518
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1519
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1520
}
1194
1521
return true;
1195
1522
}
1199
1526
* corresponds to an acceptable network device.
1200
1527
* (This function is passed to scandir(3) as a filter function.)
1201
1528
*/
1529
__attribute__((nonnull, warn_unused_result))
1202
1530
int good_interface(const struct dirent *if_entry){
1203
1531
if(if_entry->d_name[0] == '.'){
1204
1532
return 0;
1207
1535
struct ifreq ifr;
1208
1536
if(not get_flags(if_entry->d_name, &ifr)){
1209
1537
if(debug){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1538
fprintf_plus(stderr, "Failed to get flags for interface "
1539
"\"%s\"\n", if_entry->d_name);
1540
}
1541
return 0;
1542
}
1543
1544
if(not good_flags(if_entry->d_name, &ifr)){
1545
return 0;
1546
}
1547
return 1;
1548
}
1549
1550
/*
1551
* This function determines if a network interface is up.
1552
*/
1553
__attribute__((nonnull, warn_unused_result))
1554
bool interface_is_up(const char *interface){
1555
struct ifreq ifr;
1556
if(not get_flags(interface, &ifr)){
1557
if(debug){
1558
fprintf_plus(stderr, "Failed to get flags for interface "
1559
"\"%s\"\n", interface);
1560
}
1561
return false;
1562
}
1563
1564
return (bool)(ifr.ifr_flags & IFF_UP);
1565
}
1566
1567
/*
1568
* This function determines if a network interface is running
1569
*/
1570
__attribute__((nonnull, warn_unused_result))
1571
bool interface_is_running(const char *interface){
1572
struct ifreq ifr;
1573
if(not get_flags(interface, &ifr)){
1574
if(debug){
1575
fprintf_plus(stderr, "Failed to get flags for interface "
1576
"\"%s\"\n", interface);
1577
}
1578
return false;
1579
}
1580
1581
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1582
}
1583
1584
__attribute__((nonnull, pure, warn_unused_result))
1269
1585
int notdotentries(const struct dirent *direntry){
1270
1586
/* Skip "." and ".." */
1271
1587
if(direntry->d_name[0] == '.'
1278
1594
}
1279
1595
1280
1596
/* Is this directory entry a runnable program? */
1597
__attribute__((nonnull, warn_unused_result))
1281
1598
int runnable_hook(const struct dirent *direntry){
1282
1599
int ret;
1283
1600
size_t sret;
1291
1608
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
1609
"abcdefghijklmnopqrstuvwxyz"
1293
1610
"0123456789"
1294
"_-");
1611
"_.-");
1295
1612
if((direntry->d_name)[sret] != '\0'){
1296
1613
/* Contains non-allowed characters */
1297
1614
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1615
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1616
direntry->d_name);
1301
1617
}
1302
1618
return 0;
1303
1619
}
1304
1620
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1621
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1313
1622
if(ret == -1){
1314
1623
if(debug){
1315
1624
perror_plus("Could not stat hook");
1319
1628
if(not (S_ISREG(st.st_mode))){
1320
1629
/* Not a regular file */
1321
1630
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1631
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1632
direntry->d_name);
1325
1633
}
1326
1634
return 0;
1327
1635
}
1328
1636
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1637
/* Not executable */
1330
1638
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1639
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1640
direntry->d_name);
1334
1641
}
1335
1642
return 0;
1336
1643
}
1644
if(debug){
1645
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1646
direntry->d_name);
1647
}
1337
1648
return 1;
1338
1649
}
1339
1650
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1651
__attribute__((nonnull, warn_unused_result))
1652
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1653
mandos_context *mc){
1341
1654
int ret;
1342
1655
struct timespec now;
1343
1656
struct timespec waited_time;
1344
1657
intmax_t block_time;
1345
1658
1346
1659
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1660
if(mc->current_server == NULL){
1661
if(debug){
1662
fprintf_plus(stderr, "Wait until first server is found."
1663
" No timeout!\n");
1351
1664
}
1352
1665
ret = avahi_simple_poll_iterate(s, -1);
1353
1666
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1667
if(debug){
1668
fprintf_plus(stderr, "Check current_server if we should run"
1669
" it, or wait\n");
1358
1670
}
1359
1671
/* the current time */
1360
1672
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1677
/* Calculating in ms how long time between now and server
1366
1678
who we visted longest time ago. Now - last seen. */
1367
1679
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1680
- mc->current_server->last_seen.tv_sec);
1369
1681
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1682
- mc->current_server->last_seen.tv_nsec);
1371
1683
/* total time is 10s/10,000ms.
1372
1684
Converting to s from ms by dividing by 1,000,
1373
1685
and ns to ms by dividing by 1,000,000. */
1375
1687
- ((intmax_t)waited_time.tv_sec * 1000))
1376
1688
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1689
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1690
if(debug){
1691
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1692
block_time);
1381
1693
}
1382
1694
1383
1695
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1696
ret = start_mandos_communication(mc->current_server->ip,
1697
mc->current_server->port,
1698
mc->current_server->if_index,
1699
mc->current_server->af, mc);
1388
1700
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1701
avahi_simple_poll_quit(s);
1390
1702
return 0;
1391
1703
}
1392
1704
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1705
&mc->current_server->last_seen);
1394
1706
if(ret == -1){
1395
1707
perror_plus("clock_gettime");
1396
1708
return -1;
1397
1709
}
1398
mc.current_server = mc.current_server->next;
1710
mc->current_server = mc->current_server->next;
1399
1711
block_time = 0; /* Call avahi to find new Mandos
1400
1712
servers, but don't block */
1401
1713
}
1403
1715
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
1716
}
1405
1717
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1718
if(ret > 0 or errno != EINTR){
1407
1719
return (ret != 1) ? ret : 0;
1408
1720
}
1409
1721
}
1410
1722
}
1411
1723
}
1412
1724
1725
__attribute__((nonnull))
1726
void run_network_hooks(const char *mode, const char *interface,
1727
const float delay){
1728
struct dirent **direntries = NULL;
1729
if(hookdir_fd == -1){
1730
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1731
| O_CLOEXEC);
1732
if(hookdir_fd == -1){
1733
if(errno == ENOENT){
1734
if(debug){
1735
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1736
" found\n", hookdir);
1737
}
1738
} else {
1739
perror_plus("open");
1740
}
1741
return;
1742
}
1743
}
1744
#ifdef __GLIBC__
1745
#if __GLIBC_PREREQ(2, 15)
1746
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1747
runnable_hook, alphasort);
1748
#else /* not __GLIBC_PREREQ(2, 15) */
1749
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1750
alphasort);
1751
#endif /* not __GLIBC_PREREQ(2, 15) */
1752
#else /* not __GLIBC__ */
1753
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1754
alphasort);
1755
#endif /* not __GLIBC__ */
1756
if(numhooks == -1){
1757
perror_plus("scandir");
1758
return;
1759
}
1760
struct dirent *direntry;
1761
int ret;
1762
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1763
if(devnull == -1){
1764
perror_plus("open(\"/dev/null\", O_RDONLY)");
1765
return;
1766
}
1767
for(int i = 0; i < numhooks; i++){
1768
direntry = direntries[i];
1769
if(debug){
1770
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1771
direntry->d_name);
1772
}
1773
pid_t hook_pid = fork();
1774
if(hook_pid == 0){
1775
/* Child */
1776
/* Raise privileges */
1777
errno = raise_privileges_permanently();
1778
if(errno != 0){
1779
perror_plus("Failed to raise privileges");
1780
_exit(EX_NOPERM);
1781
}
1782
/* Set group */
1783
errno = 0;
1784
ret = setgid(0);
1785
if(ret == -1){
1786
perror_plus("setgid");
1787
_exit(EX_NOPERM);
1788
}
1789
/* Reset supplementary groups */
1790
errno = 0;
1791
ret = setgroups(0, NULL);
1792
if(ret == -1){
1793
perror_plus("setgroups");
1794
_exit(EX_NOPERM);
1795
}
1796
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1797
if(ret == -1){
1798
perror_plus("setenv");
1799
_exit(EX_OSERR);
1800
}
1801
ret = setenv("DEVICE", interface, 1);
1802
if(ret == -1){
1803
perror_plus("setenv");
1804
_exit(EX_OSERR);
1805
}
1806
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1807
if(ret == -1){
1808
perror_plus("setenv");
1809
_exit(EX_OSERR);
1810
}
1811
ret = setenv("MODE", mode, 1);
1812
if(ret == -1){
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
char *delaystring;
1817
ret = asprintf(&delaystring, "%f", (double)delay);
1818
if(ret == -1){
1819
perror_plus("asprintf");
1820
_exit(EX_OSERR);
1821
}
1822
ret = setenv("DELAY", delaystring, 1);
1823
if(ret == -1){
1824
free(delaystring);
1825
perror_plus("setenv");
1826
_exit(EX_OSERR);
1827
}
1828
free(delaystring);
1829
if(connect_to != NULL){
1830
ret = setenv("CONNECT", connect_to, 1);
1831
if(ret == -1){
1832
perror_plus("setenv");
1833
_exit(EX_OSERR);
1834
}
1835
}
1836
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1837
direntry->d_name,
1838
O_RDONLY));
1839
if(hook_fd == -1){
1840
perror_plus("openat");
1841
_exit(EXIT_FAILURE);
1842
}
1843
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1844
perror_plus("close");
1845
_exit(EXIT_FAILURE);
1846
}
1847
ret = dup2(devnull, STDIN_FILENO);
1848
if(ret == -1){
1849
perror_plus("dup2(devnull, STDIN_FILENO)");
1850
_exit(EX_OSERR);
1851
}
1852
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1853
if(ret == -1){
1854
perror_plus("close");
1855
_exit(EX_OSERR);
1856
}
1857
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1858
if(ret == -1){
1859
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1860
_exit(EX_OSERR);
1861
}
1862
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1863
environ) == -1){
1864
perror_plus("fexecve");
1865
_exit(EXIT_FAILURE);
1866
}
1867
} else {
1868
if(hook_pid == -1){
1869
perror_plus("fork");
1870
free(direntry);
1871
continue;
1872
}
1873
int status;
1874
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1875
perror_plus("waitpid");
1876
free(direntry);
1877
continue;
1878
}
1879
if(WIFEXITED(status)){
1880
if(WEXITSTATUS(status) != 0){
1881
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1882
" with status %d\n", direntry->d_name,
1883
WEXITSTATUS(status));
1884
free(direntry);
1885
continue;
1886
}
1887
} else if(WIFSIGNALED(status)){
1888
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1889
" signal %d\n", direntry->d_name,
1890
WTERMSIG(status));
1891
free(direntry);
1892
continue;
1893
} else {
1894
fprintf_plus(stderr, "Warning: network hook \"%s\""
1895
" crashed\n", direntry->d_name);
1896
free(direntry);
1897
continue;
1898
}
1899
}
1900
if(debug){
1901
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1902
direntry->d_name);
1903
}
1904
free(direntry);
1905
}
1906
free(direntries);
1907
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1908
perror_plus("close");
1909
} else {
1910
hookdir_fd = -1;
1911
}
1912
close(devnull);
1913
}
1914
1915
__attribute__((nonnull, warn_unused_result))
1916
error_t bring_up_interface(const char *const interface,
1917
const float delay){
1918
error_t old_errno = errno;
1919
int ret;
1920
struct ifreq network;
1921
unsigned int if_index = if_nametoindex(interface);
1922
if(if_index == 0){
1923
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1924
errno = old_errno;
1925
return ENXIO;
1926
}
1927
1928
if(quit_now){
1929
errno = old_errno;
1930
return EINTR;
1931
}
1932
1933
if(not interface_is_up(interface)){
1934
error_t ret_errno = 0, ioctl_errno = 0;
1935
if(not get_flags(interface, &network)){
1936
ret_errno = errno;
1937
fprintf_plus(stderr, "Failed to get flags for interface "
1938
"\"%s\"\n", interface);
1939
errno = old_errno;
1940
return ret_errno;
1941
}
1942
network.ifr_flags |= IFF_UP; /* set flag */
1943
1944
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1945
if(sd == -1){
1946
ret_errno = errno;
1947
perror_plus("socket");
1948
errno = old_errno;
1949
return ret_errno;
1950
}
1951
1952
if(quit_now){
1953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1954
if(ret == -1){
1955
perror_plus("close");
1956
}
1957
errno = old_errno;
1958
return EINTR;
1959
}
1960
1961
if(debug){
1962
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1963
interface);
1964
}
1965
1966
/* Raise privileges */
1967
ret_errno = raise_privileges();
1968
if(ret_errno != 0){
1969
errno = ret_errno;
1970
perror_plus("Failed to raise privileges");
1971
}
1972
1973
#ifdef __linux__
1974
int ret_linux;
1975
bool restore_loglevel = false;
1976
if(ret_errno == 0){
1977
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1978
messages about the network interface to mess up the prompt */
1979
ret_linux = klogctl(8, NULL, 5);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
} else {
1983
restore_loglevel = true;
1984
}
1985
}
1986
#endif /* __linux__ */
1987
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1988
ioctl_errno = errno;
1989
#ifdef __linux__
1990
if(restore_loglevel){
1991
ret_linux = klogctl(7, NULL, 0);
1992
if(ret_linux == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
1998
/* If raise_privileges() succeeded above */
1999
if(ret_errno == 0){
2000
/* Lower privileges */
2001
ret_errno = lower_privileges();
2002
if(ret_errno != 0){
2003
errno = ret_errno;
2004
perror_plus("Failed to lower privileges");
2005
}
2006
}
2007
2008
/* Close the socket */
2009
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2010
if(ret == -1){
2011
perror_plus("close");
2012
}
2013
2014
if(ret_setflags == -1){
2015
errno = ioctl_errno;
2016
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2017
errno = old_errno;
2018
return ioctl_errno;
2019
}
2020
} else if(debug){
2021
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2022
interface);
2023
}
2024
2025
/* Sleep checking until interface is running.
2026
Check every 0.25s, up to total time of delay */
2027
for(int i=0; i < delay * 4; i++){
2028
if(interface_is_running(interface)){
2029
break;
2030
}
2031
struct timespec sleeptime = { .tv_nsec = 250000000 };
2032
ret = nanosleep(&sleeptime, NULL);
2033
if(ret == -1 and errno != EINTR){
2034
perror_plus("nanosleep");
2035
}
2036
}
2037
2038
errno = old_errno;
2039
return 0;
2040
}
2041
2042
__attribute__((nonnull, warn_unused_result))
2043
error_t take_down_interface(const char *const interface){
2044
error_t old_errno = errno;
2045
struct ifreq network;
2046
unsigned int if_index = if_nametoindex(interface);
2047
if(if_index == 0){
2048
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2049
errno = old_errno;
2050
return ENXIO;
2051
}
2052
if(interface_is_up(interface)){
2053
error_t ret_errno = 0, ioctl_errno = 0;
2054
if(not get_flags(interface, &network) and debug){
2055
ret_errno = errno;
2056
fprintf_plus(stderr, "Failed to get flags for interface "
2057
"\"%s\"\n", interface);
2058
errno = old_errno;
2059
return ret_errno;
2060
}
2061
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2062
2063
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2064
if(sd == -1){
2065
ret_errno = errno;
2066
perror_plus("socket");
2067
errno = old_errno;
2068
return ret_errno;
2069
}
2070
2071
if(debug){
2072
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2073
interface);
2074
}
2075
2076
/* Raise privileges */
2077
ret_errno = raise_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to raise privileges");
2081
}
2082
2083
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2084
ioctl_errno = errno;
2085
2086
/* If raise_privileges() succeeded above */
2087
if(ret_errno == 0){
2088
/* Lower privileges */
2089
ret_errno = lower_privileges();
2090
if(ret_errno != 0){
2091
errno = ret_errno;
2092
perror_plus("Failed to lower privileges");
2093
}
2094
}
2095
2096
/* Close the socket */
2097
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2098
if(ret == -1){
2099
perror_plus("close");
2100
}
2101
2102
if(ret_setflags == -1){
2103
errno = ioctl_errno;
2104
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2105
errno = old_errno;
2106
return ioctl_errno;
2107
}
2108
} else if(debug){
2109
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2110
interface);
2111
}
2112
2113
errno = old_errno;
2114
return 0;
2115
}
2116
1413
2117
int main(int argc, char *argv[]){
2118
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2119
.priority = "SECURE256:!CTYPE-X.509:"
2120
"+CTYPE-OPENPGP", .current_server = NULL,
2121
.interfaces = NULL, .interfaces_size = 0 };
1414
2122
AvahiSServiceBrowser *sb = NULL;
1415
int error;
2123
error_t ret_errno;
1416
2124
int ret;
1417
2125
intmax_t tmpmax;
1418
2126
char *tmp;
1419
2127
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
1421
struct ifreq network;
1422
int sd = -1;
1423
bool take_down_interface = false;
1424
uid_t uid;
1425
gid_t gid;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
2128
char *interfaces_to_take_down = NULL;
2129
size_t interfaces_to_take_down_size = 0;
2130
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2131
char old_tempdir[] = "/tmp/mandosXXXXXX";
2132
char *tempdir = NULL;
1428
2133
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
2134
const char *seckey = PATHDIR "/" SECKEY;
1430
2135
const char *pubkey = PATHDIR "/" PUBKEY;
2136
char *interfaces_hooks = NULL;
1431
2137
1432
2138
bool gnutls_initialized = false;
1433
2139
bool gpgme_initialized = false;
1495
2201
.group = 2 },
1496
2202
{ .name = "retry", .key = 132,
1497
2203
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
2204
.doc = "Retry interval used when denied by the Mandos server",
1499
2205
.group = 2 },
1500
2206
{ .name = "network-hook-dir", .key = 133,
1501
2207
.arg = "DIR",
1524
2230
connect_to = arg;
1525
2231
break;
1526
2232
case 'i': /* --interface */
1527
interface = arg;
2233
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2234
arg, (int)',');
2235
if(ret_errno != 0){
2236
argp_error(state, "%s", strerror(ret_errno));
2237
}
1528
2238
break;
1529
2239
case 's': /* --seckey */
1530
2240
seckey = arg;
1573
2283
argp_state_help(state, state->out_stream,
1574
2284
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
2285
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
2286
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1578
2287
exit(argp_err_exit_status);
1579
2288
break;
1580
2289
default:
1603
2312
goto end;
1604
2313
}
1605
2314
}
1606
2315
1607
2316
{
1608
2317
/* Work around Debian bug #633582:
1609
2318
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
2319
2320
/* Re-raise privileges */
2321
ret_errno = raise_privileges();
2322
if(ret_errno != 0){
2323
errno = ret_errno;
2324
perror_plus("Failed to raise privileges");
1675
2325
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("DEVICE", interface, 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
ret = setenv("MODE", "start", 1);
1707
if(ret == -1){
1708
perror_plus("setenv");
1709
exit(1);
1710
}
1711
char *delaystring;
1712
ret = asprintf(&delaystring, "%f", delay);
1713
if(ret == -1){
1714
perror_plus("asprintf");
1715
exit(1);
1716
}
1717
ret = setenv("DELAY", delaystring, 1);
1718
if(ret == -1){
1719
free(delaystring);
1720
perror_plus("setenv");
1721
exit(1);
1722
}
1723
free(delaystring);
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1726
} else {
1727
int status;
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1730
free(fullname);
1731
continue;
1732
}
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1739
free(fullname);
1740
continue;
1741
}
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1746
WTERMSIG(status));
1747
free(fullname);
1748
continue;
1749
} else {
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1752
direntry->d_name);
1753
free(fullname);
1754
continue;
1755
}
1756
}
1757
free(fullname);
1758
if(quit_now){
1759
goto end;
1760
}
1761
}
1762
close(devnull);
1763
}
2326
struct stat st;
2327
2328
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2329
int seckey_fd = open(seckey, O_RDONLY);
2330
if(seckey_fd == -1){
2331
perror_plus("open");
2332
} else {
2333
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2334
if(ret == -1){
2335
perror_plus("fstat");
2336
} else {
2337
if(S_ISREG(st.st_mode)
2338
and st.st_uid == 0 and st.st_gid == 0){
2339
ret = fchown(seckey_fd, uid, gid);
2340
if(ret == -1){
2341
perror_plus("fchown");
2342
}
2343
}
2344
}
2345
TEMP_FAILURE_RETRY(close(seckey_fd));
2346
}
2347
}
2348
2349
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2350
int pubkey_fd = open(pubkey, O_RDONLY);
2351
if(pubkey_fd == -1){
2352
perror_plus("open");
2353
} else {
2354
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2355
if(ret == -1){
2356
perror_plus("fstat");
2357
} else {
2358
if(S_ISREG(st.st_mode)
2359
and st.st_uid == 0 and st.st_gid == 0){
2360
ret = fchown(pubkey_fd, uid, gid);
2361
if(ret == -1){
2362
perror_plus("fchown");
2363
}
2364
}
2365
}
2366
TEMP_FAILURE_RETRY(close(pubkey_fd));
2367
}
2368
}
2369
2370
/* Lower privileges */
2371
ret_errno = lower_privileges();
2372
if(ret_errno != 0){
2373
errno = ret_errno;
2374
perror_plus("Failed to lower privileges");
2375
}
2376
}
2377
}
2378
2379
/* Remove invalid interface names (except "none") */
2380
{
2381
char *interface = NULL;
2382
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2383
interface))){
2384
if(strcmp(interface, "none") != 0
2385
and if_nametoindex(interface) == 0){
2386
if(interface[0] != '\0'){
2387
fprintf_plus(stderr, "Not using nonexisting interface"
2388
" \"%s\"\n", interface);
2389
}
2390
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2391
interface = NULL;
2392
}
2393
}
2394
}
2395
2396
/* Run network hooks */
2397
{
2398
if(mc.interfaces != NULL){
2399
interfaces_hooks = malloc(mc.interfaces_size);
2400
if(interfaces_hooks == NULL){
2401
perror_plus("malloc");
2402
goto end;
2403
}
2404
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2405
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2406
}
2407
run_network_hooks("start", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
1764
2409
}
1765
2410
1766
2411
if(not debug){
1767
2412
avahi_set_log_function(empty_log);
1768
2413
}
1769
2414
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1787
}
1788
if(interface == NULL){
1789
perror_plus("malloc");
1790
free(direntries);
1791
exitcode = EXIT_FAILURE;
1792
goto end;
1793
}
1794
free(direntries);
1795
} else {
1796
free(direntries);
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
}
1803
1804
2415
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
2416
from the signal handler */
1806
2417
/* Initialize the pseudo-RNG for Avahi */
1807
2418
srand((unsigned int) time(NULL));
1808
mc.simple_poll = avahi_simple_poll_new();
1809
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
2419
simple_poll = avahi_simple_poll_new();
2420
if(simple_poll == NULL){
2421
fprintf_plus(stderr,
2422
"Avahi: Failed to create simple poll object.\n");
1812
2423
exitcode = EX_UNAVAILABLE;
1813
2424
goto end;
1814
2425
}
1876
2487
}
1877
2488
}
1878
2489
1879
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1882
if(if_index == 0){
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1886
goto end;
1887
}
1888
1889
if(quit_now){
1890
goto end;
1891
}
1892
1893
/* Re-raise priviliges */
1894
errno = 0;
1895
ret = seteuid(0);
1896
if(ret == -1){
1897
perror_plus("seteuid");
1898
}
1899
1900
#ifdef __linux__
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1903
ret = klogctl(8, NULL, 5);
1904
bool restore_loglevel = true;
1905
if(ret == -1){
1906
restore_loglevel = false;
1907
perror_plus("klogctl");
1908
}
1909
#endif /* __linux__ */
1910
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1912
if(sd < 0){
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1915
#ifdef __linux__
1916
if(restore_loglevel){
1917
ret = klogctl(7, NULL, 0);
1918
if(ret == -1){
1919
perror_plus("klogctl");
1920
}
1921
}
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1924
errno = 0;
1925
ret = seteuid(uid);
1926
if(ret == -1){
1927
perror_plus("seteuid");
1928
}
1929
goto end;
1930
}
1931
strcpy(network.ifr_name, interface);
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1933
if(ret == -1){
1934
perror_plus("ioctl SIOCGIFFLAGS");
1935
#ifdef __linux__
1936
if(restore_loglevel){
1937
ret = klogctl(7, NULL, 0);
1938
if(ret == -1){
1939
perror_plus("klogctl");
1940
}
1941
}
1942
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
if((network.ifr_flags & IFF_UP) == 0){
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1956
if(ret == -1){
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1960
#ifdef __linux__
1961
if(restore_loglevel){
1962
ret = klogctl(7, NULL, 0);
1963
if(ret == -1){
1964
perror_plus("klogctl");
2490
/* If no interfaces were specified, make a list */
2491
if(mc.interfaces == NULL){
2492
struct dirent **direntries = NULL;
2493
/* Look for any good interfaces */
2494
ret = scandir(sys_class_net, &direntries, good_interface,
2495
alphasort);
2496
if(ret >= 1){
2497
/* Add all found interfaces to interfaces list */
2498
for(int i = 0; i < ret; ++i){
2499
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2500
direntries[i]->d_name);
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("argz_add");
2504
free(direntries[i]);
2505
continue;
2506
}
2507
if(debug){
2508
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2509
direntries[i]->d_name);
2510
}
2511
free(direntries[i]);
2512
}
2513
free(direntries);
2514
} else {
2515
if(ret == 0){
2516
free(direntries);
2517
}
2518
fprintf_plus(stderr, "Could not find a network interface\n");
2519
exitcode = EXIT_FAILURE;
2520
goto end;
2521
}
2522
}
2523
2524
/* Bring up interfaces which are down, and remove any "none"s */
2525
{
2526
char *interface = NULL;
2527
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2528
interface))){
2529
/* If interface name is "none", stop bringing up interfaces.
2530
Also remove all instances of "none" from the list */
2531
if(strcmp(interface, "none") == 0){
2532
argz_delete(&mc.interfaces, &mc.interfaces_size,
2533
interface);
2534
interface = NULL;
2535
while((interface = argz_next(mc.interfaces,
2536
mc.interfaces_size, interface))){
2537
if(strcmp(interface, "none") == 0){
2538
argz_delete(&mc.interfaces, &mc.interfaces_size,
2539
interface);
2540
interface = NULL;
1965
2541
}
1966
2542
}
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1969
errno = 0;
1970
ret = seteuid(uid);
1971
if(ret == -1){
1972
perror_plus("seteuid");
1973
}
1974
goto end;
1975
}
1976
}
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1979
for(int i=0; i < delay * 4; i++){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_RUNNING){
1984
2543
break;
1985
2544
}
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
ret = nanosleep(&sleeptime, NULL);
1988
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1990
}
1991
}
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
}
1999
#ifdef __linux__
2000
if(restore_loglevel){
2001
/* Restores kernel loglevel to default */
2002
ret = klogctl(7, NULL, 0);
2003
if(ret == -1){
2004
perror_plus("klogctl");
2005
}
2006
}
2007
#endif /* __linux__ */
2008
/* Lower privileges */
2009
errno = 0;
2010
if(take_down_interface){
2011
/* Lower privileges */
2012
ret = seteuid(uid);
2013
if(ret == -1){
2014
perror_plus("seteuid");
2015
}
2016
} else {
2017
/* Lower privileges permanently */
2018
ret = setuid(uid);
2019
if(ret == -1){
2020
perror_plus("setuid");
2021
}
2022
}
2545
bool interface_was_up = interface_is_up(interface);
2546
errno = bring_up_interface(interface, delay);
2547
if(not interface_was_up){
2548
if(errno != 0){
2549
perror_plus("Failed to bring up interface");
2550
} else {
2551
errno = argz_add(&interfaces_to_take_down,
2552
&interfaces_to_take_down_size,
2553
interface);
2554
if(errno != 0){
2555
perror_plus("argz_add");
2556
}
2557
}
2558
}
2559
}
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces were brought up\n");
2562
}
2563
}
2564
2565
/* If we only got one interface, explicitly use only that one */
2566
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2567
if(debug){
2568
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2569
mc.interfaces);
2570
}
2571
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2023
2572
}
2024
2573
2025
2574
if(quit_now){
2026
2575
goto end;
2027
2576
}
2028
2577
2029
ret = init_gnutls_global(pubkey, seckey);
2578
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
2579
if(ret == -1){
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2580
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2581
exitcode = EX_UNAVAILABLE;
2034
2582
goto end;
2035
2583
} else {
2040
2588
goto end;
2041
2589
}
2042
2590
2043
if(mkdtemp(tempdir) == NULL){
2591
/* Try /run/tmp before /tmp */
2592
tempdir = mkdtemp(run_tempdir);
2593
if(tempdir == NULL and errno == ENOENT){
2594
if(debug){
2595
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2596
run_tempdir, old_tempdir);
2597
}
2598
tempdir = mkdtemp(old_tempdir);
2599
}
2600
if(tempdir == NULL){
2044
2601
perror_plus("mkdtemp");
2045
2602
goto end;
2046
2603
}
2047
tempdir_created = true;
2048
2604
2049
2605
if(quit_now){
2050
2606
goto end;
2051
2607
}
2052
2608
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
2609
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2610
fprintf_plus(stderr, "init_gpgme failed\n");
2056
2611
exitcode = EX_UNAVAILABLE;
2057
2612
goto end;
2058
2613
} else {
2067
2622
/* Connect directly, do not use Zeroconf */
2068
2623
/* (Mainly meant for debugging) */
2069
2624
char *address = strrchr(connect_to, ':');
2625
2070
2626
if(address == NULL){
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
2627
fprintf_plus(stderr, "No colon in address\n");
2073
2628
exitcode = EX_USAGE;
2074
2629
goto end;
2075
2630
}
2078
2633
goto end;
2079
2634
}
2080
2635
2081
uint16_t port;
2636
in_port_t port;
2082
2637
errno = 0;
2083
2638
tmpmax = strtoimax(address+1, &tmp, 10);
2084
2639
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
or tmpmax != (uint16_t)tmpmax){
2086
fprintf(stderr, "Mandos plugin mandos-client: "
2087
"Bad port number\n");
2640
or tmpmax != (in_port_t)tmpmax){
2641
fprintf_plus(stderr, "Bad port number\n");
2088
2642
exitcode = EX_USAGE;
2089
2643
goto end;
2090
2644
}
2091
2645
2092
2646
if(quit_now){
2093
2647
goto end;
2094
2648
}
2095
2649
2096
port = (uint16_t)tmpmax;
2650
port = (in_port_t)tmpmax;
2097
2651
*address = '\0';
2098
2652
/* Colon in address indicates IPv6 */
2099
2653
int af;
2115
2669
}
2116
2670
2117
2671
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2672
ret = start_mandos_communication(address, port, if_index, af,
2673
&mc);
2119
2674
if(quit_now or ret == 0){
2120
2675
break;
2121
2676
}
2122
2677
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2678
fprintf_plus(stderr, "Retrying in %d seconds\n",
2679
(int)retry_interval);
2125
2680
}
2126
sleep((int)retry_interval);
2681
sleep((unsigned int)retry_interval);
2127
2682
}
2128
2683
2129
if (not quit_now){
2684
if(not quit_now){
2130
2685
exitcode = EXIT_SUCCESS;
2131
2686
}
2132
2687
2147
2702
config.publish_domain = 0;
2148
2703
2149
2704
/* Allocate a new server */
2150
mc.server = avahi_server_new(avahi_simple_poll_get
2151
(mc.simple_poll), &config, NULL,
2152
NULL, &error);
2705
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2706
&config, NULL, NULL, &ret_errno);
2153
2707
2154
2708
/* Free the Avahi configuration data */
2155
2709
avahi_server_config_free(&config);
2157
2711
2158
2712
/* Check if creating the Avahi server object succeeded */
2159
2713
if(mc.server == NULL){
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
2162
avahi_strerror(error));
2714
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2715
avahi_strerror(ret_errno));
2163
2716
exitcode = EX_UNAVAILABLE;
2164
2717
goto end;
2165
2718
}
2171
2724
/* Create the Avahi service browser */
2172
2725
sb = avahi_s_service_browser_new(mc.server, if_index,
2173
2726
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2174
NULL, 0, browse_callback, NULL);
2727
NULL, 0, browse_callback,
2728
(void *)&mc);
2175
2729
if(sb == NULL){
2176
fprintf(stderr, "Mandos plugin mandos-client: "
2177
"Failed to create service browser: %s\n",
2178
avahi_strerror(avahi_server_errno(mc.server)));
2730
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2731
avahi_strerror(avahi_server_errno(mc.server)));
2179
2732
exitcode = EX_UNAVAILABLE;
2180
2733
goto end;
2181
2734
}
2187
2740
/* Run the main loop */
2188
2741
2189
2742
if(debug){
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2743
fprintf_plus(stderr, "Starting Avahi loop search\n");
2192
2744
}
2193
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2745
2746
ret = avahi_loop_with_timeout(simple_poll,
2747
(int)(retry_interval * 1000), &mc);
2196
2748
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2749
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2750
(ret == 0) ? "successfully" : "with error");
2200
2751
}
2201
2752
2202
2753
end:
2203
2754
2204
2755
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
2756
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2207
2757
}
2208
2758
2209
2759
/* Cleanup things */
2760
free(mc.interfaces);
2761
2210
2762
if(sb != NULL)
2211
2763
avahi_s_service_browser_free(sb);
2212
2764
2213
2765
if(mc.server != NULL)
2214
2766
avahi_server_free(mc.server);
2215
2767
2216
if(mc.simple_poll != NULL)
2217
avahi_simple_poll_free(mc.simple_poll);
2768
if(simple_poll != NULL)
2769
avahi_simple_poll_free(simple_poll);
2218
2770
2219
2771
if(gnutls_initialized){
2220
2772
gnutls_certificate_free_credentials(mc.cred);
2225
2777
if(gpgme_initialized){
2226
2778
gpgme_release(mc.ctx);
2227
2779
}
2228
2780
2229
2781
/* Cleans up the circular linked list of Mandos servers the client
2230
2782
has seen */
2231
2783
if(mc.current_server != NULL){
2232
2784
mc.current_server->prev->next = NULL;
2233
2785
while(mc.current_server != NULL){
2234
2786
server *next = mc.current_server->next;
2787
#ifdef __GNUC__
2788
#pragma GCC diagnostic push
2789
#pragma GCC diagnostic ignored "-Wcast-qual"
2790
#endif
2791
free((char *)(mc.current_server->ip));
2792
#ifdef __GNUC__
2793
#pragma GCC diagnostic pop
2794
#endif
2235
2795
free(mc.current_server);
2236
2796
mc.current_server = next;
2237
2797
}
2238
2798
}
2239
2799
2240
/* XXX run network hooks "stop" here */
2241
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2245
errno = 0;
2246
ret = seteuid(0);
2247
if(ret == -1){
2248
perror_plus("seteuid");
2800
/* Re-raise privileges */
2801
{
2802
ret_errno = raise_privileges();
2803
if(ret_errno != 0){
2804
errno = ret_errno;
2805
perror_plus("Failed to raise privileges");
2806
} else {
2807
2808
/* Run network hooks */
2809
run_network_hooks("stop", interfaces_hooks != NULL ?
2810
interfaces_hooks : "", delay);
2811
2812
/* Take down the network interfaces which were brought up */
2813
{
2814
char *interface = NULL;
2815
while((interface=argz_next(interfaces_to_take_down,
2816
interfaces_to_take_down_size,
2817
interface))){
2818
ret_errno = take_down_interface(interface);
2819
if(ret_errno != 0){
2820
errno = ret_errno;
2821
perror_plus("Failed to take down interface");
2822
}
2823
}
2824
if(debug and (interfaces_to_take_down == NULL)){
2825
fprintf_plus(stderr, "No interfaces needed to be taken"
2826
" down\n");
2827
}
2828
}
2249
2829
}
2250
if(geteuid() == 0){
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2257
if(ret == -1){
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
}
2260
}
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2262
if(ret == -1){
2263
perror_plus("close");
2264
}
2265
/* Lower privileges permanently */
2266
errno = 0;
2267
ret = setuid(uid);
2268
if(ret == -1){
2269
perror_plus("setuid");
2270
}
2830
2831
ret_errno = lower_privileges_permanently();
2832
if(ret_errno != 0){
2833
errno = ret_errno;
2834
perror_plus("Failed to lower privileges permanently");
2271
2835
}
2272
2836
}
2273
2837
2838
free(interfaces_to_take_down);
2839
free(interfaces_hooks);
2840
2274
2841
/* Removes the GPGME temp directory and all files inside */
2275
if(tempdir_created){
2842
if(tempdir != NULL){
2276
2843
struct dirent **direntries = NULL;
2277
struct dirent *direntry = NULL;
2278
int numentries = scandir(tempdir, &direntries, notdotentries,
2279
alphasort);
2280
if (numentries > 0){
2281
for(int i = 0; i < numentries; i++){
2282
direntry = direntries[i];
2283
char *fullname = NULL;
2284
ret = asprintf(&fullname, "%s/%s", tempdir,
2285
direntry->d_name);
2286
if(ret < 0){
2287
perror_plus("asprintf");
2288
continue;
2289
}
2290
ret = remove(fullname);
2291
if(ret == -1){
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2294
}
2295
free(fullname);
2844
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2845
| O_NOFOLLOW
2846
| O_DIRECTORY
2847
| O_PATH));
2848
if(tempdir_fd == -1){
2849
perror_plus("open");
2850
} else {
2851
#ifdef __GLIBC__
2852
#if __GLIBC_PREREQ(2, 15)
2853
int numentries = scandirat(tempdir_fd, ".", &direntries,
2854
notdotentries, alphasort);
2855
#else /* not __GLIBC_PREREQ(2, 15) */
2856
int numentries = scandir(tempdir, &direntries, notdotentries,
2857
alphasort);
2858
#endif /* not __GLIBC_PREREQ(2, 15) */
2859
#else /* not __GLIBC__ */
2860
int numentries = scandir(tempdir, &direntries, notdotentries,
2861
alphasort);
2862
#endif /* not __GLIBC__ */
2863
if(numentries >= 0){
2864
for(int i = 0; i < numentries; i++){
2865
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2866
if(ret == -1){
2867
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2868
" \"%s\", 0): %s\n", tempdir,
2869
direntries[i]->d_name, strerror(errno));
2870
}
2871
free(direntries[i]);
2872
}
2873
2874
/* need to clean even if 0 because man page doesn't specify */
2875
free(direntries);
2876
if(numentries == -1){
2877
perror_plus("scandir");
2878
}
2879
ret = rmdir(tempdir);
2880
if(ret == -1 and errno != ENOENT){
2881
perror_plus("rmdir");
2882
}
2296
2883
}
2297
}
2298
2299
/* need to clean even if 0 because man page doesn't specify */
2300
free(direntries);
2301
if (numentries == -1){
2302
perror_plus("scandir");
2303
}
2304
ret = rmdir(tempdir);
2305
if(ret == -1 and errno != ENOENT){
2306
perror_plus("rmdir");
2884
TEMP_FAILURE_RETRY(close(tempdir_fd));
2307
2885
}
2308
2886
}
2309
2887
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0