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- Committer: Teddy Hogeborn
- Date: 2015-05-31 16:13:39 UTC
- Revision ID: teddy@recompile.se-20150531161339-igb3l0ip3c10ejpz
mandos-ctl: Generate better messages in exceptions.
mandos (rfc3339_duration_to_delta): Remove dead code. Adjust white
space.
mandos-ctl (rfc3339_duration_to_delta): Do minor formatting and
whitespace adjustments, and
Generate better message in
exception.
(string_to_delta): Adjust quote character in doc string.
mandos (rfc3339_duration_to_delta): Remove dead code. Adjust white
space.
mandos-ctl (rfc3339_duration_to_delta): Do minor formatting and
whitespace adjustments, and
Generate better message in
exception.
(string_to_delta): Adjust quote character in doc string.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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 */
473
if(ret == NULL)
474
ret = "(unknown)";
475
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
476
507
}
477
508
478
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
479
511
static void debuggnutls(__attribute__((unused)) int level,
480
512
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
482
514
}
483
515
516
__attribute__((nonnull, warn_unused_result))
484
517
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
518
const char *seckeyfilename,
519
mandos_context *mc){
486
520
int ret;
521
unsigned int uret;
487
522
488
523
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
525
}
492
526
493
527
ret = gnutls_global_init();
494
528
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
497
531
return -1;
498
532
}
499
533
506
540
}
507
541
508
542
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
544
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
513
547
gnutls_global_deinit();
514
548
return -1;
515
549
}
516
550
517
551
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);
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
554
pubkeyfilename,
555
seckeyfilename);
522
556
}
523
557
524
558
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
559
(mc->cred, pubkeyfilename, seckeyfilename,
526
560
GNUTLS_OPENPGP_FMT_BASE64);
527
561
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));
562
fprintf_plus(stderr,
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
534
567
goto globalfail;
535
568
}
536
569
537
570
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
571
ret = gnutls_dh_params_init(&mc->dh_params);
539
572
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));
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
543
576
goto globalfail;
544
577
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
680
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));
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
550
683
goto globalfail;
551
684
}
552
685
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
687
555
688
return 0;
556
689
557
690
globalfail:
558
691
559
gnutls_certificate_free_credentials(mc.cred);
692
gnutls_certificate_free_credentials(mc->cred);
560
693
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
694
gnutls_dh_params_deinit(mc->dh_params);
562
695
return -1;
563
696
}
564
697
565
static int init_gnutls_session(gnutls_session_t *session){
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
566
701
int ret;
567
702
/* GnuTLS session creation */
568
703
do {
572
707
}
573
708
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
709
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));
710
fprintf_plus(stderr,
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
578
713
}
579
714
580
715
{
581
716
const char *err;
582
717
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
719
if(quit_now){
585
720
gnutls_deinit(*session);
586
721
return -1;
587
722
}
588
723
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
724
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));
725
fprintf_plus(stderr, "Syntax error at: %s\n", err);
726
fprintf_plus(stderr, "GnuTLS error: %s\n",
727
safer_gnutls_strerror(ret));
594
728
gnutls_deinit(*session);
595
729
return -1;
596
730
}
598
732
599
733
do {
600
734
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
735
mc->cred);
602
736
if(quit_now){
603
737
gnutls_deinit(*session);
604
738
return -1;
605
739
}
606
740
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
741
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
611
744
gnutls_deinit(*session);
612
745
return -1;
613
746
}
615
748
/* ignore client certificate if any. */
616
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
617
750
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
752
620
753
return 0;
621
754
}
625
758
__attribute__((unused)) const char *txt){}
626
759
627
760
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
761
__attribute__((nonnull, warn_unused_result))
762
static int start_mandos_communication(const char *ip, in_port_t port,
629
763
AvahiIfIndex if_index,
630
int af){
764
int af, mandos_context *mc){
631
765
int ret, tcp_sd = -1;
632
766
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
767
struct sockaddr_storage to;
637
768
char *buffer = NULL;
638
769
char *decrypted_buffer = NULL;
639
770
size_t buffer_length = 0;
658
789
pf = PF_INET;
659
790
break;
660
791
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
792
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
793
errno = EINVAL;
664
794
return -1;
665
795
}
666
796
667
ret = init_gnutls_session(&session);
797
/* If the interface is specified and we have a list of interfaces */
798
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
799
/* Check if the interface is one of the interfaces we are using */
800
bool match = false;
801
{
802
char *interface = NULL;
803
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
804
interface))){
805
if(if_nametoindex(interface) == (unsigned int)if_index){
806
match = true;
807
break;
808
}
809
}
810
}
811
if(not match){
812
/* This interface does not match any in the list, so we don't
813
connect to the server */
814
if(debug){
815
char interface[IF_NAMESIZE];
816
if(if_indextoname((unsigned int)if_index, interface) == NULL){
817
perror_plus("if_indextoname");
818
} else {
819
fprintf_plus(stderr, "Skipping server on non-used interface"
820
" \"%s\"\n",
821
if_indextoname((unsigned int)if_index,
822
interface));
823
}
824
}
825
return -1;
826
}
827
}
828
829
ret = init_gnutls_session(&session, mc);
668
830
if(ret != 0){
669
831
return -1;
670
832
}
671
833
672
834
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
835
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
836
PRIuMAX "\n", ip, (uintmax_t)port);
676
837
}
677
838
678
839
tcp_sd = socket(pf, SOCK_STREAM, 0);
690
851
691
852
memset(&to, 0, sizeof(to));
692
853
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
695
856
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
698
859
}
699
860
if(ret < 0 ){
700
861
int e = errno;
704
865
}
705
866
if(ret == 0){
706
867
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
868
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
869
errno = e;
710
870
goto mandos_end;
711
871
}
712
872
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*/
873
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
874
if(IN6_IS_ADDR_LINKLOCAL
875
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
720
876
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");
877
fprintf_plus(stderr, "An IPv6 link-local address is"
878
" incomplete without a network interface\n");
724
879
errno = EINVAL;
725
880
goto mandos_end;
726
881
}
727
882
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
883
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
729
884
}
730
885
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
886
((struct sockaddr_in *)&to)->sin_port = htons(port);
734
887
}
735
888
736
889
if(quit_now){
744
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
898
perror_plus("if_indextoname");
746
899
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
900
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
901
"\n", ip, interface, (uintmax_t)port);
750
902
}
751
903
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
904
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
905
ip, (uintmax_t)port);
754
906
}
755
907
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
908
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
909
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
913
NI_NUMERICHOST);
761
914
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
918
NI_NUMERICHOST);
764
919
}
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
}
920
if(ret == EAI_SYSTEM){
921
perror_plus("getnameinfo");
922
} else if(ret != 0) {
923
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
924
} else if(strcmp(addrstr, ip) != 0){
925
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
772
926
}
773
927
}
774
928
778
932
}
779
933
780
934
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
782
937
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
784
940
}
785
941
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
943
int e = errno;
788
944
perror_plus("connect");
789
945
errno = e;
827
983
}
828
984
829
985
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
986
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
987
}
833
988
834
989
if(quit_now){
836
991
goto mandos_end;
837
992
}
838
993
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
994
/* This casting via intptr_t is to eliminate warning about casting
995
an int to a pointer type. This is exactly how the GnuTLS Guile
996
function "set-session-transport-fd!" does it. */
997
gnutls_transport_set_ptr(session,
998
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
999
842
1000
if(quit_now){
843
1001
errno = EINTR;
854
1012
855
1013
if(ret != GNUTLS_E_SUCCESS){
856
1014
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
1015
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
1016
gnutls_perror(ret);
860
1017
}
861
1018
errno = EPROTO;
865
1022
/* Read OpenPGP packet that contains the wanted password */
866
1023
867
1024
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
1025
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1026
" %s\n", ip);
870
1027
}
871
1028
872
1029
while(true){
910
1067
}
911
1068
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
1069
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
1070
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1071
"***\n");
915
1072
gnutls_perror(ret);
916
1073
errno = EPROTO;
917
1074
goto mandos_end;
918
1075
}
919
1076
break;
920
1077
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
1078
fprintf_plus(stderr, "Unknown error while reading data from"
1079
" encrypted session with Mandos server\n");
924
1080
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
1081
errno = EIO;
926
1082
goto mandos_end;
931
1087
}
932
1088
933
1089
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
1090
fprintf_plus(stderr, "Closing TLS session\n");
936
1091
}
937
1092
938
1093
if(quit_now){
951
1106
if(buffer_length > 0){
952
1107
ssize_t decrypted_buffer_size;
953
1108
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
1109
&decrypted_buffer, mc);
955
1110
if(decrypted_buffer_size >= 0){
956
1111
957
1112
written = 0;
967
1122
if(ret == 0 and ferror(stdout)){
968
1123
int e = errno;
969
1124
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
1125
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1126
strerror(errno));
973
1127
}
974
1128
errno = e;
975
1129
goto mandos_end;
1006
1160
return retval;
1007
1161
}
1008
1162
1163
__attribute__((nonnull))
1009
1164
static void resolve_callback(AvahiSServiceResolver *r,
1010
1165
AvahiIfIndex interface,
1011
1166
AvahiProtocol proto,
1019
1174
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1175
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1176
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1177
void *mc){
1178
if(r == NULL){
1179
return;
1180
}
1024
1181
1025
1182
/* Called whenever a service has been resolved successfully or
1026
1183
timed out */
1027
1184
1028
1185
if(quit_now){
1186
avahi_s_service_resolver_free(r);
1029
1187
return;
1030
1188
}
1031
1189
1032
1190
switch(event){
1033
1191
default:
1034
1192
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)));
1193
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1194
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1195
domain,
1196
avahi_strerror(avahi_server_errno
1197
(((mandos_context*)mc)->server)));
1039
1198
break;
1040
1199
1041
1200
case AVAHI_RESOLVER_FOUND:
1043
1202
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1203
avahi_address_snprint(ip, sizeof(ip), address);
1045
1204
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);
1205
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1206
PRIdMAX ") on port %" PRIu16 "\n", name,
1207
host_name, ip, (intmax_t)interface, port);
1050
1208
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1209
int ret = start_mandos_communication(ip, (in_port_t)port,
1210
interface,
1211
avahi_proto_to_af(proto),
1212
mc);
1053
1213
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1214
avahi_simple_poll_quit(simple_poll);
1055
1215
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1216
if(not add_server(ip, (in_port_t)port, interface,
1217
avahi_proto_to_af(proto),
1218
&((mandos_context*)mc)->current_server)){
1219
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1220
" list\n", name);
1221
}
1058
1222
}
1059
1223
}
1060
1224
}
1070
1234
const char *domain,
1071
1235
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1236
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1237
void *mc){
1238
if(b == NULL){
1239
return;
1240
}
1075
1241
1076
1242
/* Called whenever a new services becomes available on the LAN or
1077
1243
is removed from the LAN */
1084
1250
default:
1085
1251
case AVAHI_BROWSER_FAILURE:
1086
1252
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);
1253
fprintf_plus(stderr, "(Avahi browser) %s\n",
1254
avahi_strerror(avahi_server_errno
1255
(((mandos_context*)mc)->server)));
1256
avahi_simple_poll_quit(simple_poll);
1091
1257
return;
1092
1258
1093
1259
case AVAHI_BROWSER_NEW:
1096
1262
the callback function is called the Avahi server will free the
1097
1263
resolver for us. */
1098
1264
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)));
1265
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1266
interface, protocol, name, type,
1267
domain, protocol, 0,
1268
resolve_callback, mc) == NULL)
1269
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1270
" %s\n", name,
1271
avahi_strerror(avahi_server_errno
1272
(((mandos_context*)mc)->server)));
1105
1273
break;
1106
1274
1107
1275
case AVAHI_BROWSER_REMOVE:
1110
1278
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1279
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1280
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1281
fprintf_plus(stderr, "No Mandos server found, still"
1282
" searching...\n");
1115
1283
}
1116
1284
break;
1117
1285
}
1126
1294
signal_received = sig;
1127
1295
int old_errno = errno;
1128
1296
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1297
if(simple_poll != NULL){
1298
avahi_simple_poll_quit(simple_poll);
1131
1299
}
1132
1300
errno = old_errno;
1133
1301
}
1134
1302
1303
__attribute__((nonnull, warn_unused_result))
1135
1304
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1305
int ret;
1306
error_t ret_errno;
1137
1307
1138
1308
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1309
if(s < 0){
1310
ret_errno = errno;
1140
1311
perror_plus("socket");
1312
errno = ret_errno;
1141
1313
return false;
1142
1314
}
1143
1315
strcpy(ifr->ifr_name, ifname);
1144
1316
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1317
if(ret == -1){
1146
1318
if(debug){
1319
ret_errno = errno;
1147
1320
perror_plus("ioctl SIOCGIFFLAGS");
1321
errno = ret_errno;
1148
1322
}
1149
1323
return false;
1150
1324
}
1151
1325
return true;
1152
1326
}
1153
1327
1328
__attribute__((nonnull, warn_unused_result))
1154
1329
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1330
1156
1331
/* Reject the loopback device */
1157
1332
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1333
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1334
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1335
ifname);
1161
1336
}
1162
1337
return false;
1163
1338
}
1164
1339
/* Accept point-to-point devices only if connect_to is specified */
1165
1340
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1341
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1342
fprintf_plus(stderr, "Accepting point-to-point interface"
1343
" \"%s\"\n", ifname);
1169
1344
}
1170
1345
return true;
1171
1346
}
1172
1347
/* Otherwise, reject non-broadcast-capable devices */
1173
1348
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1349
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1350
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1351
" \"%s\"\n", ifname);
1177
1352
}
1178
1353
return false;
1179
1354
}
1180
1355
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1356
if(ifr->ifr_flags & IFF_NOARP){
1182
1357
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1358
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1359
ifname);
1185
1360
}
1186
1361
return false;
1187
1362
}
1188
1363
1189
1364
/* Accept this device */
1190
1365
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1366
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1367
}
1194
1368
return true;
1195
1369
}
1199
1373
* corresponds to an acceptable network device.
1200
1374
* (This function is passed to scandir(3) as a filter function.)
1201
1375
*/
1376
__attribute__((nonnull, warn_unused_result))
1202
1377
int good_interface(const struct dirent *if_entry){
1203
1378
if(if_entry->d_name[0] == '.'){
1204
1379
return 0;
1207
1382
struct ifreq ifr;
1208
1383
if(not get_flags(if_entry->d_name, &ifr)){
1209
1384
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
1385
fprintf_plus(stderr, "Failed to get flags for interface "
1386
"\"%s\"\n", if_entry->d_name);
1387
}
1388
return 0;
1389
}
1390
1391
if(not good_flags(if_entry->d_name, &ifr)){
1392
return 0;
1393
}
1394
return 1;
1395
}
1396
1397
/*
1398
* This function determines if a network interface is up.
1399
*/
1400
__attribute__((nonnull, warn_unused_result))
1401
bool interface_is_up(const char *interface){
1402
struct ifreq ifr;
1403
if(not get_flags(interface, &ifr)){
1404
if(debug){
1405
fprintf_plus(stderr, "Failed to get flags for interface "
1406
"\"%s\"\n", interface);
1407
}
1408
return false;
1409
}
1410
1411
return (bool)(ifr.ifr_flags & IFF_UP);
1412
}
1413
1414
/*
1415
* This function determines if a network interface is running
1416
*/
1417
__attribute__((nonnull, warn_unused_result))
1418
bool interface_is_running(const char *interface){
1419
struct ifreq ifr;
1420
if(not get_flags(interface, &ifr)){
1421
if(debug){
1422
fprintf_plus(stderr, "Failed to get flags for interface "
1423
"\"%s\"\n", interface);
1424
}
1425
return false;
1426
}
1427
1428
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1429
}
1430
1431
__attribute__((nonnull, pure, warn_unused_result))
1269
1432
int notdotentries(const struct dirent *direntry){
1270
1433
/* Skip "." and ".." */
1271
1434
if(direntry->d_name[0] == '.'
1278
1441
}
1279
1442
1280
1443
/* Is this directory entry a runnable program? */
1444
__attribute__((nonnull, warn_unused_result))
1281
1445
int runnable_hook(const struct dirent *direntry){
1282
1446
int ret;
1283
1447
size_t sret;
1291
1455
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
1456
"abcdefghijklmnopqrstuvwxyz"
1293
1457
"0123456789"
1294
"_-");
1458
"_.-");
1295
1459
if((direntry->d_name)[sret] != '\0'){
1296
1460
/* Contains non-allowed characters */
1297
1461
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1462
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1463
direntry->d_name);
1301
1464
}
1302
1465
return 0;
1303
1466
}
1304
1467
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);
1468
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1313
1469
if(ret == -1){
1314
1470
if(debug){
1315
1471
perror_plus("Could not stat hook");
1319
1475
if(not (S_ISREG(st.st_mode))){
1320
1476
/* Not a regular file */
1321
1477
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1478
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1479
direntry->d_name);
1325
1480
}
1326
1481
return 0;
1327
1482
}
1328
1483
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1484
/* Not executable */
1330
1485
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1486
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1487
direntry->d_name);
1334
1488
}
1335
1489
return 0;
1336
1490
}
1491
if(debug){
1492
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1493
direntry->d_name);
1494
}
1337
1495
return 1;
1338
1496
}
1339
1497
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1498
__attribute__((nonnull, warn_unused_result))
1499
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1500
mandos_context *mc){
1341
1501
int ret;
1342
1502
struct timespec now;
1343
1503
struct timespec waited_time;
1344
1504
intmax_t block_time;
1345
1505
1346
1506
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");
1507
if(mc->current_server == NULL){
1508
if(debug){
1509
fprintf_plus(stderr, "Wait until first server is found."
1510
" No timeout!\n");
1351
1511
}
1352
1512
ret = avahi_simple_poll_iterate(s, -1);
1353
1513
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1514
if(debug){
1515
fprintf_plus(stderr, "Check current_server if we should run"
1516
" it, or wait\n");
1358
1517
}
1359
1518
/* the current time */
1360
1519
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1524
/* Calculating in ms how long time between now and server
1366
1525
who we visted longest time ago. Now - last seen. */
1367
1526
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1527
- mc->current_server->last_seen.tv_sec);
1369
1528
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1529
- mc->current_server->last_seen.tv_nsec);
1371
1530
/* total time is 10s/10,000ms.
1372
1531
Converting to s from ms by dividing by 1,000,
1373
1532
and ns to ms by dividing by 1,000,000. */
1375
1534
- ((intmax_t)waited_time.tv_sec * 1000))
1376
1535
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1536
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1537
if(debug){
1538
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1539
block_time);
1381
1540
}
1382
1541
1383
1542
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);
1543
ret = start_mandos_communication(mc->current_server->ip,
1544
mc->current_server->port,
1545
mc->current_server->if_index,
1546
mc->current_server->af, mc);
1388
1547
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(s);
1390
1549
return 0;
1391
1550
}
1392
1551
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1552
&mc->current_server->last_seen);
1394
1553
if(ret == -1){
1395
1554
perror_plus("clock_gettime");
1396
1555
return -1;
1397
1556
}
1398
mc.current_server = mc.current_server->next;
1557
mc->current_server = mc->current_server->next;
1399
1558
block_time = 0; /* Call avahi to find new Mandos
1400
1559
servers, but don't block */
1401
1560
}
1403
1562
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
1563
}
1405
1564
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1565
if(ret > 0 or errno != EINTR){
1407
1566
return (ret != 1) ? ret : 0;
1408
1567
}
1409
1568
}
1410
1569
}
1411
1570
}
1412
1571
1572
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1574
error_t raise_privileges(void){
1575
error_t old_errno = errno;
1576
error_t ret_errno = 0;
1577
if(seteuid(0) == -1){
1578
ret_errno = errno;
1579
}
1580
errno = old_errno;
1581
return ret_errno;
1582
}
1583
1584
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1586
error_t raise_privileges_permanently(void){
1587
error_t old_errno = errno;
1588
error_t ret_errno = raise_privileges();
1589
if(ret_errno != 0){
1590
errno = old_errno;
1591
return ret_errno;
1592
}
1593
if(setuid(0) == -1){
1594
ret_errno = errno;
1595
}
1596
errno = old_errno;
1597
return ret_errno;
1598
}
1599
1600
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
error_t lower_privileges(void){
1603
error_t old_errno = errno;
1604
error_t ret_errno = 0;
1605
if(seteuid(uid) == -1){
1606
ret_errno = errno;
1607
}
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
error_t lower_privileges_permanently(void){
1615
error_t old_errno = errno;
1616
error_t ret_errno = 0;
1617
if(setuid(uid) == -1){
1618
ret_errno = errno;
1619
}
1620
errno = old_errno;
1621
return ret_errno;
1622
}
1623
1624
__attribute__((nonnull))
1625
void run_network_hooks(const char *mode, const char *interface,
1626
const float delay){
1627
struct dirent **direntries = NULL;
1628
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1630
if(hookdir_fd == -1){
1631
if(errno == ENOENT){
1632
if(debug){
1633
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1634
" found\n", hookdir);
1635
}
1636
} else {
1637
perror_plus("open");
1638
}
1639
return;
1640
}
1641
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
1654
if(numhooks == -1){
1655
perror_plus("scandir");
1656
return;
1657
}
1658
struct dirent *direntry;
1659
int ret;
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[i];
1663
if(debug){
1664
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1665
direntry->d_name);
1666
}
1667
pid_t hook_pid = fork();
1668
if(hook_pid == 0){
1669
/* Child */
1670
/* Raise privileges */
1671
errno = raise_privileges_permanently();
1672
if(errno != 0){
1673
perror_plus("Failed to raise privileges");
1674
_exit(EX_NOPERM);
1675
}
1676
/* Set group */
1677
errno = 0;
1678
ret = setgid(0);
1679
if(ret == -1){
1680
perror_plus("setgid");
1681
_exit(EX_NOPERM);
1682
}
1683
/* Reset supplementary groups */
1684
errno = 0;
1685
ret = setgroups(0, NULL);
1686
if(ret == -1){
1687
perror_plus("setgroups");
1688
_exit(EX_NOPERM);
1689
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1706
if(ret == -1){
1707
perror_plus("setenv");
1708
_exit(EX_OSERR);
1709
}
1710
ret = setenv("DEVICE", interface, 1);
1711
if(ret == -1){
1712
perror_plus("setenv");
1713
_exit(EX_OSERR);
1714
}
1715
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1716
if(ret == -1){
1717
perror_plus("setenv");
1718
_exit(EX_OSERR);
1719
}
1720
ret = setenv("MODE", mode, 1);
1721
if(ret == -1){
1722
perror_plus("setenv");
1723
_exit(EX_OSERR);
1724
}
1725
char *delaystring;
1726
ret = asprintf(&delaystring, "%f", (double)delay);
1727
if(ret == -1){
1728
perror_plus("asprintf");
1729
_exit(EX_OSERR);
1730
}
1731
ret = setenv("DELAY", delaystring, 1);
1732
if(ret == -1){
1733
free(delaystring);
1734
perror_plus("setenv");
1735
_exit(EX_OSERR);
1736
}
1737
free(delaystring);
1738
if(connect_to != NULL){
1739
ret = setenv("CONNECT", connect_to, 1);
1740
if(ret == -1){
1741
perror_plus("setenv");
1742
_exit(EX_OSERR);
1743
}
1744
}
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1746
if(hook_fd == -1){
1747
perror_plus("openat");
1748
_exit(EXIT_FAILURE);
1749
}
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1751
perror_plus("close");
1752
_exit(EXIT_FAILURE);
1753
}
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1755
environ) == -1){
1756
perror_plus("fexecve");
1757
_exit(EXIT_FAILURE);
1758
}
1759
} else {
1760
if(hook_pid == -1){
1761
perror_plus("fork");
1762
free(direntry);
1763
continue;
1764
}
1765
int status;
1766
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
perror_plus("waitpid");
1768
free(direntry);
1769
continue;
1770
}
1771
if(WIFEXITED(status)){
1772
if(WEXITSTATUS(status) != 0){
1773
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1774
" with status %d\n", direntry->d_name,
1775
WEXITSTATUS(status));
1776
free(direntry);
1777
continue;
1778
}
1779
} else if(WIFSIGNALED(status)){
1780
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1781
" signal %d\n", direntry->d_name,
1782
WTERMSIG(status));
1783
free(direntry);
1784
continue;
1785
} else {
1786
fprintf_plus(stderr, "Warning: network hook \"%s\""
1787
" crashed\n", direntry->d_name);
1788
free(direntry);
1789
continue;
1790
}
1791
}
1792
if(debug){
1793
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1794
direntry->d_name);
1795
}
1796
free(direntry);
1797
}
1798
free(direntries);
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1800
perror_plus("close");
1801
} else {
1802
hookdir_fd = -1;
1803
}
1804
close(devnull);
1805
}
1806
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
1811
int ret;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
1820
if(quit_now){
1821
errno = old_errno;
1822
return EINTR;
1823
}
1824
1825
if(not interface_is_up(interface)){
1826
error_t ret_errno = 0, ioctl_errno = 0;
1827
if(not get_flags(interface, &network)){
1828
ret_errno = errno;
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
network.ifr_flags |= IFF_UP; /* set flag */
1835
1836
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1837
if(sd == -1){
1838
ret_errno = errno;
1839
perror_plus("socket");
1840
errno = old_errno;
1841
return ret_errno;
1842
}
1843
1844
if(quit_now){
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
errno = old_errno;
1850
return EINTR;
1851
}
1852
1853
if(debug){
1854
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1855
interface);
1856
}
1857
1858
/* Raise privileges */
1859
ret_errno = raise_privileges();
1860
if(ret_errno != 0){
1861
errno = ret_errno;
1862
perror_plus("Failed to raise privileges");
1863
}
1864
1865
#ifdef __linux__
1866
int ret_linux;
1867
bool restore_loglevel = false;
1868
if(ret_errno == 0){
1869
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1870
messages about the network interface to mess up the prompt */
1871
ret_linux = klogctl(8, NULL, 5);
1872
if(ret_linux == -1){
1873
perror_plus("klogctl");
1874
} else {
1875
restore_loglevel = true;
1876
}
1877
}
1878
#endif /* __linux__ */
1879
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1880
ioctl_errno = errno;
1881
#ifdef __linux__
1882
if(restore_loglevel){
1883
ret_linux = klogctl(7, NULL, 0);
1884
if(ret_linux == -1){
1885
perror_plus("klogctl");
1886
}
1887
}
1888
#endif /* __linux__ */
1889
1890
/* If raise_privileges() succeeded above */
1891
if(ret_errno == 0){
1892
/* Lower privileges */
1893
ret_errno = lower_privileges();
1894
if(ret_errno != 0){
1895
errno = ret_errno;
1896
perror_plus("Failed to lower privileges");
1897
}
1898
}
1899
1900
/* Close the socket */
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1902
if(ret == -1){
1903
perror_plus("close");
1904
}
1905
1906
if(ret_setflags == -1){
1907
errno = ioctl_errno;
1908
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1909
errno = old_errno;
1910
return ioctl_errno;
1911
}
1912
} else if(debug){
1913
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1914
interface);
1915
}
1916
1917
/* Sleep checking until interface is running.
1918
Check every 0.25s, up to total time of delay */
1919
for(int i=0; i < delay * 4; i++){
1920
if(interface_is_running(interface)){
1921
break;
1922
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
1930
errno = old_errno;
1931
return 0;
1932
}
1933
1934
__attribute__((nonnull, warn_unused_result))
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
1937
struct ifreq network;
1938
unsigned int if_index = if_nametoindex(interface);
1939
if(if_index == 0){
1940
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1941
errno = old_errno;
1942
return ENXIO;
1943
}
1944
if(interface_is_up(interface)){
1945
error_t ret_errno = 0, ioctl_errno = 0;
1946
if(not get_flags(interface, &network) and debug){
1947
ret_errno = errno;
1948
fprintf_plus(stderr, "Failed to get flags for interface "
1949
"\"%s\"\n", interface);
1950
errno = old_errno;
1951
return ret_errno;
1952
}
1953
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1954
1955
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1956
if(sd == -1){
1957
ret_errno = errno;
1958
perror_plus("socket");
1959
errno = old_errno;
1960
return ret_errno;
1961
}
1962
1963
if(debug){
1964
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1965
interface);
1966
}
1967
1968
/* Raise privileges */
1969
ret_errno = raise_privileges();
1970
if(ret_errno != 0){
1971
errno = ret_errno;
1972
perror_plus("Failed to raise privileges");
1973
}
1974
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1987
1988
/* Close the socket */
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1997
errno = old_errno;
1998
return ioctl_errno;
1999
}
2000
} else if(debug){
2001
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2002
interface);
2003
}
2004
2005
errno = old_errno;
2006
return 0;
2007
}
2008
1413
2009
int main(int argc, char *argv[]){
2010
mandos_context mc = { .server = NULL, .dh_bits = 0,
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
1414
2014
AvahiSServiceBrowser *sb = NULL;
1415
int error;
2015
error_t ret_errno;
1416
2016
int ret;
1417
2017
intmax_t tmpmax;
1418
2018
char *tmp;
1419
2019
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;
2020
char *interfaces_to_take_down = NULL;
2021
size_t interfaces_to_take_down_size = 0;
2022
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2023
char old_tempdir[] = "/tmp/mandosXXXXXX";
2024
char *tempdir = NULL;
1428
2025
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
2026
const char *seckey = PATHDIR "/" SECKEY;
1430
2027
const char *pubkey = PATHDIR "/" PUBKEY;
2028
char *interfaces_hooks = NULL;
1431
2029
1432
2030
bool gnutls_initialized = false;
1433
2031
bool gpgme_initialized = false;
1495
2093
.group = 2 },
1496
2094
{ .name = "retry", .key = 132,
1497
2095
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
2096
.doc = "Retry interval used when denied by the Mandos server",
1499
2097
.group = 2 },
1500
2098
{ .name = "network-hook-dir", .key = 133,
1501
2099
.arg = "DIR",
1524
2122
connect_to = arg;
1525
2123
break;
1526
2124
case 'i': /* --interface */
1527
interface = arg;
2125
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2126
arg, (int)',');
2127
if(ret_errno != 0){
2128
argp_error(state, "%s", strerror(ret_errno));
2129
}
1528
2130
break;
1529
2131
case 's': /* --seckey */
1530
2132
seckey = arg;
1573
2175
argp_state_help(state, state->out_stream,
1574
2176
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
2177
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
2178
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1578
2179
exit(argp_err_exit_status);
1579
2180
break;
1580
2181
default:
1607
2208
{
1608
2209
/* Work around Debian bug #633582:
1609
2210
<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");
2211
2212
/* Re-raise privileges */
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2216
perror_plus("Failed to raise privileges");
1675
2217
} 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("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
1754
goto end;
1755
}
1756
}
1757
close(devnull);
1758
}
2218
struct stat st;
2219
2220
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2221
int seckey_fd = open(seckey, O_RDONLY);
2222
if(seckey_fd == -1){
2223
perror_plus("open");
2224
} else {
2225
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2226
if(ret == -1){
2227
perror_plus("fstat");
2228
} else {
2229
if(S_ISREG(st.st_mode)
2230
and st.st_uid == 0 and st.st_gid == 0){
2231
ret = fchown(seckey_fd, uid, gid);
2232
if(ret == -1){
2233
perror_plus("fchown");
2234
}
2235
}
2236
}
2237
TEMP_FAILURE_RETRY(close(seckey_fd));
2238
}
2239
}
2240
2241
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2242
int pubkey_fd = open(pubkey, O_RDONLY);
2243
if(pubkey_fd == -1){
2244
perror_plus("open");
2245
} else {
2246
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2247
if(ret == -1){
2248
perror_plus("fstat");
2249
} else {
2250
if(S_ISREG(st.st_mode)
2251
and st.st_uid == 0 and st.st_gid == 0){
2252
ret = fchown(pubkey_fd, uid, gid);
2253
if(ret == -1){
2254
perror_plus("fchown");
2255
}
2256
}
2257
}
2258
TEMP_FAILURE_RETRY(close(pubkey_fd));
2259
}
2260
}
2261
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
}
2270
2271
/* Remove invalid interface names (except "none") */
2272
{
2273
char *interface = NULL;
2274
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2275
interface))){
2276
if(strcmp(interface, "none") != 0
2277
and if_nametoindex(interface) == 0){
2278
if(interface[0] != '\0'){
2279
fprintf_plus(stderr, "Not using nonexisting interface"
2280
" \"%s\"\n", interface);
2281
}
2282
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2283
interface = NULL;
2284
}
2285
}
2286
}
2287
2288
/* Run network hooks */
2289
{
2290
if(mc.interfaces != NULL){
2291
interfaces_hooks = malloc(mc.interfaces_size);
2292
if(interfaces_hooks == NULL){
2293
perror_plus("malloc");
2294
goto end;
2295
}
2296
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2297
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2298
}
2299
run_network_hooks("start", interfaces_hooks != NULL ?
2300
interfaces_hooks : "", delay);
1759
2301
}
1760
2302
1761
2303
if(not debug){
1762
2304
avahi_set_log_function(empty_log);
1763
2305
}
1764
2306
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
1799
2307
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1800
2308
from the signal handler */
1801
2309
/* Initialize the pseudo-RNG for Avahi */
1802
2310
srand((unsigned int) time(NULL));
1803
mc.simple_poll = avahi_simple_poll_new();
1804
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
2311
simple_poll = avahi_simple_poll_new();
2312
if(simple_poll == NULL){
2313
fprintf_plus(stderr,
2314
"Avahi: Failed to create simple poll object.\n");
1807
2315
exitcode = EX_UNAVAILABLE;
1808
2316
goto end;
1809
2317
}
1871
2379
}
1872
2380
}
1873
2381
1874
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1877
if(if_index == 0){
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1881
goto end;
1882
}
1883
1884
if(quit_now){
1885
goto end;
1886
}
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1895
#ifdef __linux__
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1898
ret = klogctl(8, NULL, 5);
1899
bool restore_loglevel = true;
1900
if(ret == -1){
1901
restore_loglevel = false;
1902
perror_plus("klogctl");
1903
}
1904
#endif /* __linux__ */
1905
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1907
if(sd < 0){
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1910
#ifdef __linux__
1911
if(restore_loglevel){
1912
ret = klogctl(7, NULL, 0);
1913
if(ret == -1){
1914
perror_plus("klogctl");
1915
}
1916
}
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
goto end;
1925
}
1926
strcpy(network.ifr_name, interface);
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1928
if(ret == -1){
1929
perror_plus("ioctl SIOCGIFFLAGS");
1930
#ifdef __linux__
1931
if(restore_loglevel){
1932
ret = klogctl(7, NULL, 0);
1933
if(ret == -1){
1934
perror_plus("klogctl");
1935
}
1936
}
1937
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1945
goto end;
1946
}
1947
if((network.ifr_flags & IFF_UP) == 0){
1948
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1951
if(ret == -1){
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1955
#ifdef __linux__
1956
if(restore_loglevel){
1957
ret = klogctl(7, NULL, 0);
1958
if(ret == -1){
1959
perror_plus("klogctl");
2382
/* If no interfaces were specified, make a list */
2383
if(mc.interfaces == NULL){
2384
struct dirent **direntries = NULL;
2385
/* Look for any good interfaces */
2386
ret = scandir(sys_class_net, &direntries, good_interface,
2387
alphasort);
2388
if(ret >= 1){
2389
/* Add all found interfaces to interfaces list */
2390
for(int i = 0; i < ret; ++i){
2391
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2392
direntries[i]->d_name);
2393
if(ret_errno != 0){
2394
errno = ret_errno;
2395
perror_plus("argz_add");
2396
free(direntries[i]);
2397
continue;
2398
}
2399
if(debug){
2400
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2401
direntries[i]->d_name);
2402
}
2403
free(direntries[i]);
2404
}
2405
free(direntries);
2406
} else {
2407
if(ret == 0){
2408
free(direntries);
2409
}
2410
fprintf_plus(stderr, "Could not find a network interface\n");
2411
exitcode = EXIT_FAILURE;
2412
goto end;
2413
}
2414
}
2415
2416
/* Bring up interfaces which are down, and remove any "none"s */
2417
{
2418
char *interface = NULL;
2419
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2420
interface))){
2421
/* If interface name is "none", stop bringing up interfaces.
2422
Also remove all instances of "none" from the list */
2423
if(strcmp(interface, "none") == 0){
2424
argz_delete(&mc.interfaces, &mc.interfaces_size,
2425
interface);
2426
interface = NULL;
2427
while((interface = argz_next(mc.interfaces,
2428
mc.interfaces_size, interface))){
2429
if(strcmp(interface, "none") == 0){
2430
argz_delete(&mc.interfaces, &mc.interfaces_size,
2431
interface);
2432
interface = NULL;
1960
2433
}
1961
2434
}
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1969
goto end;
1970
}
1971
}
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1974
for(int i=0; i < delay * 4; i++){
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1976
if(ret == -1){
1977
perror_plus("ioctl SIOCGIFFLAGS");
1978
} else if(network.ifr_flags & IFF_RUNNING){
1979
2435
break;
1980
2436
}
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
ret = nanosleep(&sleeptime, NULL);
1983
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1985
}
1986
}
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
}
1994
#ifdef __linux__
1995
if(restore_loglevel){
1996
/* Restores kernel loglevel to default */
1997
ret = klogctl(7, NULL, 0);
1998
if(ret == -1){
1999
perror_plus("klogctl");
2000
}
2001
}
2002
#endif /* __linux__ */
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
} else {
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
2437
bool interface_was_up = interface_is_up(interface);
2438
errno = bring_up_interface(interface, delay);
2439
if(not interface_was_up){
2440
if(errno != 0){
2441
perror_plus("Failed to bring up interface");
2442
} else {
2443
errno = argz_add(&interfaces_to_take_down,
2444
&interfaces_to_take_down_size,
2445
interface);
2446
if(errno != 0){
2447
perror_plus("argz_add");
2448
}
2449
}
2450
}
2451
}
2452
if(debug and (interfaces_to_take_down == NULL)){
2453
fprintf_plus(stderr, "No interfaces were brought up\n");
2454
}
2455
}
2456
2457
/* If we only got one interface, explicitly use only that one */
2458
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2459
if(debug){
2460
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2461
mc.interfaces);
2462
}
2463
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2018
2464
}
2019
2465
2020
2466
if(quit_now){
2021
2467
goto end;
2022
2468
}
2023
2469
2024
ret = init_gnutls_global(pubkey, seckey);
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
2025
2471
if(ret == -1){
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2472
fprintf_plus(stderr, "init_gnutls_global failed\n");
2028
2473
exitcode = EX_UNAVAILABLE;
2029
2474
goto end;
2030
2475
} else {
2035
2480
goto end;
2036
2481
}
2037
2482
2038
if(mkdtemp(tempdir) == NULL){
2483
/* Try /run/tmp before /tmp */
2484
tempdir = mkdtemp(run_tempdir);
2485
if(tempdir == NULL and errno == ENOENT){
2486
if(debug){
2487
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2488
run_tempdir, old_tempdir);
2489
}
2490
tempdir = mkdtemp(old_tempdir);
2491
}
2492
if(tempdir == NULL){
2039
2493
perror_plus("mkdtemp");
2040
2494
goto end;
2041
2495
}
2042
tempdir_created = true;
2043
2496
2044
2497
if(quit_now){
2045
2498
goto end;
2046
2499
}
2047
2500
2048
if(not init_gpgme(pubkey, seckey, tempdir)){
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2501
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2502
fprintf_plus(stderr, "init_gpgme failed\n");
2051
2503
exitcode = EX_UNAVAILABLE;
2052
2504
goto end;
2053
2505
} else {
2062
2514
/* Connect directly, do not use Zeroconf */
2063
2515
/* (Mainly meant for debugging) */
2064
2516
char *address = strrchr(connect_to, ':');
2517
2065
2518
if(address == NULL){
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2519
fprintf_plus(stderr, "No colon in address\n");
2068
2520
exitcode = EX_USAGE;
2069
2521
goto end;
2070
2522
}
2073
2525
goto end;
2074
2526
}
2075
2527
2076
uint16_t port;
2528
in_port_t port;
2077
2529
errno = 0;
2078
2530
tmpmax = strtoimax(address+1, &tmp, 10);
2079
2531
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2080
or tmpmax != (uint16_t)tmpmax){
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2532
or tmpmax != (in_port_t)tmpmax){
2533
fprintf_plus(stderr, "Bad port number\n");
2083
2534
exitcode = EX_USAGE;
2084
2535
goto end;
2085
2536
}
2086
2537
2087
2538
if(quit_now){
2088
2539
goto end;
2089
2540
}
2090
2541
2091
port = (uint16_t)tmpmax;
2542
port = (in_port_t)tmpmax;
2092
2543
*address = '\0';
2093
2544
/* Colon in address indicates IPv6 */
2094
2545
int af;
2110
2561
}
2111
2562
2112
2563
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2564
ret = start_mandos_communication(address, port, if_index, af,
2565
&mc);
2114
2566
if(quit_now or ret == 0){
2115
2567
break;
2116
2568
}
2117
2569
if(debug){
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2570
fprintf_plus(stderr, "Retrying in %d seconds\n",
2571
(int)retry_interval);
2120
2572
}
2121
sleep((int)retry_interval);
2573
sleep((unsigned int)retry_interval);
2122
2574
}
2123
2575
2124
if (not quit_now){
2576
if(not quit_now){
2125
2577
exitcode = EXIT_SUCCESS;
2126
2578
}
2127
2579
2142
2594
config.publish_domain = 0;
2143
2595
2144
2596
/* Allocate a new server */
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2598
&config, NULL, NULL, &ret_errno);
2148
2599
2149
2600
/* Free the Avahi configuration data */
2150
2601
avahi_server_config_free(&config);
2152
2603
2153
2604
/* Check if creating the Avahi server object succeeded */
2154
2605
if(mc.server == NULL){
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
2157
avahi_strerror(error));
2606
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2607
avahi_strerror(ret_errno));
2158
2608
exitcode = EX_UNAVAILABLE;
2159
2609
goto end;
2160
2610
}
2166
2616
/* Create the Avahi service browser */
2167
2617
sb = avahi_s_service_browser_new(mc.server, if_index,
2168
2618
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2169
NULL, 0, browse_callback, NULL);
2619
NULL, 0, browse_callback,
2620
(void *)&mc);
2170
2621
if(sb == NULL){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2622
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2623
avahi_strerror(avahi_server_errno(mc.server)));
2174
2624
exitcode = EX_UNAVAILABLE;
2175
2625
goto end;
2176
2626
}
2182
2632
/* Run the main loop */
2183
2633
2184
2634
if(debug){
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2635
fprintf_plus(stderr, "Starting Avahi loop search\n");
2187
2636
}
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2637
2638
ret = avahi_loop_with_timeout(simple_poll,
2639
(int)(retry_interval * 1000), &mc);
2191
2640
if(debug){
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2641
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2642
(ret == 0) ? "successfully" : "with error");
2195
2643
}
2196
2644
2197
2645
end:
2198
2646
2199
2647
if(debug){
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
2648
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2202
2649
}
2203
2650
2204
2651
/* Cleanup things */
2652
free(mc.interfaces);
2653
2205
2654
if(sb != NULL)
2206
2655
avahi_s_service_browser_free(sb);
2207
2656
2208
2657
if(mc.server != NULL)
2209
2658
avahi_server_free(mc.server);
2210
2659
2211
if(mc.simple_poll != NULL)
2212
avahi_simple_poll_free(mc.simple_poll);
2660
if(simple_poll != NULL)
2661
avahi_simple_poll_free(simple_poll);
2213
2662
2214
2663
if(gnutls_initialized){
2215
2664
gnutls_certificate_free_credentials(mc.cred);
2220
2669
if(gpgme_initialized){
2221
2670
gpgme_release(mc.ctx);
2222
2671
}
2223
2672
2224
2673
/* Cleans up the circular linked list of Mandos servers the client
2225
2674
has seen */
2226
2675
if(mc.current_server != NULL){
2227
2676
mc.current_server->prev->next = NULL;
2228
2677
while(mc.current_server != NULL){
2229
2678
server *next = mc.current_server->next;
2679
#ifdef __GNUC__
2680
#pragma GCC diagnostic push
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
2682
#endif
2683
free((char *)(mc.current_server->ip));
2684
#ifdef __GNUC__
2685
#pragma GCC diagnostic pop
2686
#endif
2230
2687
free(mc.current_server);
2231
2688
mc.current_server = next;
2232
2689
}
2233
2690
}
2234
2691
2235
/* XXX run network hooks "stop" here */
2236
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
2242
if(ret == -1){
2243
perror_plus("seteuid");
2692
/* Re-raise privileges */
2693
{
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
2697
perror_plus("Failed to raise privileges");
2698
} else {
2699
2700
/* Run network hooks */
2701
run_network_hooks("stop", interfaces_hooks != NULL ?
2702
interfaces_hooks : "", delay);
2703
2704
/* Take down the network interfaces which were brought up */
2705
{
2706
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("Failed to take down interface");
2714
}
2715
}
2716
if(debug and (interfaces_to_take_down == NULL)){
2717
fprintf_plus(stderr, "No interfaces needed to be taken"
2718
" down\n");
2719
}
2720
}
2244
2721
}
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2254
}
2255
}
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2265
}
2722
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("Failed to lower privileges permanently");
2266
2727
}
2267
2728
}
2268
2729
2730
free(interfaces_to_take_down);
2731
free(interfaces_hooks);
2732
2269
2733
/* Removes the GPGME temp directory and all files inside */
2270
if(tempdir_created){
2734
if(tempdir != NULL){
2271
2735
struct dirent **direntries = NULL;
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
alphasort);
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
2278
char *fullname = NULL;
2279
ret = asprintf(&fullname, "%s/%s", tempdir,
2280
direntry->d_name);
2281
if(ret < 0){
2282
perror_plus("asprintf");
2283
continue;
2284
}
2285
ret = remove(fullname);
2286
if(ret == -1){
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2289
}
2290
free(fullname);
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
2291
2773
}
2292
}
2293
2294
/* need to clean even if 0 because man page doesn't specify */
2295
free(direntries);
2296
if (numentries == -1){
2297
perror_plus("scandir");
2298
}
2299
ret = rmdir(tempdir);
2300
if(ret == -1 and errno != ENOENT){
2301
perror_plus("rmdir");
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2302
2775
}
2303
2776
}
2304
2777
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0