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- Committer: Teddy Hogeborn
- Date: 2014-06-08 17:36:33 UTC
- Revision ID: teddy@recompile.se-20140608173633-miqqavhoxym10uiz
Fix mandos server "--servicename" option, broken since 1.6.4.
* mandos (initlogger): Make "syslogger" a global variable again.
* mandos (initlogger): Make "syslogger" a global variable again.
- 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
*
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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
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14
*
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* 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
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#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
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#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
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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
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/* Doubly linked list that need to be circularly linked when used */
139
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typedef struct server{
140
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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
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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
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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
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
210
243
}
211
244
/* Special case of first server */
212
if (mc.current_server == NULL){
245
if(*current_server == NULL){
213
246
new_server->next = new_server;
214
247
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
248
*current_server = new_server;
217
249
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
220
253
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;
254
(*current_server)->prev = new_server;
255
}
256
return true;
229
257
}
230
258
231
259
/*
232
260
* Initialize GPGME.
233
261
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
236
267
gpgme_error_t rc;
237
268
gpgme_engine_info_t engine_info;
238
269
239
240
270
/*
241
271
* Helper function to insert pub and seckey to the engine keyring.
242
272
*/
243
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
244
274
int ret;
245
275
int fd;
246
276
gpgme_data_t pgp_data;
253
283
254
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
285
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));
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
259
288
return false;
260
289
}
261
290
262
rc = gpgme_op_import(mc.ctx, pgp_data);
291
rc = gpgme_op_import(mc->ctx, pgp_data);
263
292
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));
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
267
295
return false;
268
296
}
269
297
276
304
}
277
305
278
306
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
307
fprintf_plus(stderr, "Initializing GPGME\n");
281
308
}
282
309
283
310
/* Init GPGME */
284
311
gpgme_check_version(NULL);
285
312
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
313
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));
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
290
316
return false;
291
317
}
292
318
293
319
/* Set GPGME home directory for the OpenPGP engine only */
294
320
rc = gpgme_get_engine_info(&engine_info);
295
321
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));
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
299
324
return false;
300
325
}
301
326
while(engine_info != NULL){
307
332
engine_info = engine_info->next;
308
333
}
309
334
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
312
337
return false;
313
338
}
314
339
315
340
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
341
rc = gpgme_new(&(mc->ctx));
317
342
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));
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
321
346
return false;
322
347
}
323
348
332
357
* Decrypt OpenPGP data.
333
358
* Returns -1 on error
334
359
*/
360
__attribute__((nonnull, warn_unused_result))
335
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
362
size_t crypto_size,
337
char **plaintext){
363
char **plaintext,
364
mandos_context *mc){
338
365
gpgme_data_t dh_crypto, dh_plain;
339
366
gpgme_error_t rc;
340
367
ssize_t ret;
342
369
ssize_t plaintext_length = 0;
343
370
344
371
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
373
}
348
374
349
375
/* Create new GPGME data buffer from memory cryptotext */
350
376
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
377
0);
352
378
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));
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
356
381
return -1;
357
382
}
358
383
359
384
/* Create new empty GPGME data buffer for the plaintext */
360
385
rc = gpgme_data_new(&dh_plain);
361
386
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));
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
365
390
gpgme_data_release(dh_crypto);
366
391
return -1;
367
392
}
368
393
369
394
/* Decrypt data from the cryptotext data buffer to the plaintext
370
395
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
397
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));
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
376
400
plaintext_length = -1;
377
401
if(debug){
378
402
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
403
result = gpgme_op_decrypt_result(mc->ctx);
380
404
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
406
} 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);
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
390
411
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
413
}
394
414
gpgme_recipient_t recipient;
395
415
recipient = result->recipients;
396
416
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");
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
406
424
recipient = recipient->next;
407
425
}
408
426
}
411
429
}
412
430
413
431
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
433
}
417
434
418
435
/* Seek back to the beginning of the GPGME plaintext data buffer */
449
466
}
450
467
451
468
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
469
fprintf_plus(stderr, "Decrypted password is: ");
454
470
for(ssize_t i = 0; i < plaintext_length; i++){
455
471
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
472
}
467
483
return plaintext_length;
468
484
}
469
485
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
473
489
if(ret == NULL)
474
490
ret = "(unknown)";
475
491
return ret;
476
492
}
477
493
478
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
479
496
static void debuggnutls(__attribute__((unused)) int level,
480
497
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
498
fprintf_plus(stderr, "GnuTLS: %s", string);
482
499
}
483
500
501
__attribute__((nonnull, warn_unused_result))
484
502
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
503
const char *seckeyfilename,
504
mandos_context *mc){
486
505
int ret;
487
506
488
507
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
509
}
492
510
493
511
ret = gnutls_global_init();
494
512
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
497
515
return -1;
498
516
}
499
517
506
524
}
507
525
508
526
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
528
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
513
531
gnutls_global_deinit();
514
532
return -1;
515
533
}
516
534
517
535
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);
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
522
540
}
523
541
524
542
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
543
(mc->cred, pubkeyfilename, seckeyfilename,
526
544
GNUTLS_OPENPGP_FMT_BASE64);
527
545
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));
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
534
551
goto globalfail;
535
552
}
536
553
537
554
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
555
ret = gnutls_dh_params_init(&mc->dh_params);
539
556
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));
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
543
560
goto globalfail;
544
561
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
563
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));
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
550
566
goto globalfail;
551
567
}
552
568
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
570
555
571
return 0;
556
572
557
573
globalfail:
558
574
559
gnutls_certificate_free_credentials(mc.cred);
575
gnutls_certificate_free_credentials(mc->cred);
560
576
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
577
gnutls_dh_params_deinit(mc->dh_params);
562
578
return -1;
563
579
}
564
580
565
static int init_gnutls_session(gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
566
584
int ret;
567
585
/* GnuTLS session creation */
568
586
do {
572
590
}
573
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
592
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));
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
578
596
}
579
597
580
598
{
581
599
const char *err;
582
600
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
602
if(quit_now){
585
603
gnutls_deinit(*session);
586
604
return -1;
587
605
}
588
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
607
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));
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
594
611
gnutls_deinit(*session);
595
612
return -1;
596
613
}
598
615
599
616
do {
600
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
618
mc->cred);
602
619
if(quit_now){
603
620
gnutls_deinit(*session);
604
621
return -1;
605
622
}
606
623
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
624
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
611
627
gnutls_deinit(*session);
612
628
return -1;
613
629
}
615
631
/* ignore client certificate if any. */
616
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
617
633
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
635
620
636
return 0;
621
637
}
625
641
__attribute__((unused)) const char *txt){}
626
642
627
643
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
629
646
AvahiIfIndex if_index,
630
int af){
647
int af, mandos_context *mc){
631
648
int ret, tcp_sd = -1;
632
649
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
650
struct sockaddr_storage to;
637
651
char *buffer = NULL;
638
652
char *decrypted_buffer = NULL;
639
653
size_t buffer_length = 0;
658
672
pf = PF_INET;
659
673
break;
660
674
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
676
errno = EINVAL;
664
677
return -1;
665
678
}
666
679
667
ret = init_gnutls_session(&session);
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
668
713
if(ret != 0){
669
714
return -1;
670
715
}
671
716
672
717
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
676
720
}
677
721
678
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
690
734
691
735
memset(&to, 0, sizeof(to));
692
736
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
695
739
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
698
742
}
699
743
if(ret < 0 ){
700
744
int e = errno;
704
748
}
705
749
if(ret == 0){
706
750
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
752
errno = e;
710
753
goto mandos_end;
711
754
}
712
755
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*/
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
720
759
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");
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
724
762
errno = EINVAL;
725
763
goto mandos_end;
726
764
}
727
765
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
729
767
}
730
768
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
734
770
}
735
771
736
772
if(quit_now){
744
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
781
perror_plus("if_indextoname");
746
782
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
750
785
}
751
786
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
754
789
}
755
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
792
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
761
797
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
764
802
}
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
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
772
809
}
773
810
}
774
811
778
815
}
779
816
780
817
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
782
820
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
784
823
}
785
824
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
826
int e = errno;
788
827
perror_plus("connect");
789
828
errno = e;
827
866
}
828
867
829
868
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
870
}
833
871
834
872
if(quit_now){
836
874
goto mandos_end;
837
875
}
838
876
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
882
842
883
if(quit_now){
843
884
errno = EINTR;
854
895
855
896
if(ret != GNUTLS_E_SUCCESS){
856
897
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
899
gnutls_perror(ret);
860
900
}
861
901
errno = EPROTO;
865
905
/* Read OpenPGP packet that contains the wanted password */
866
906
867
907
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
870
910
}
871
911
872
912
while(true){
910
950
}
911
951
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
952
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
915
955
gnutls_perror(ret);
916
956
errno = EPROTO;
917
957
goto mandos_end;
918
958
}
919
959
break;
920
960
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
924
963
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
964
errno = EIO;
926
965
goto mandos_end;
931
970
}
932
971
933
972
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
973
fprintf_plus(stderr, "Closing TLS session\n");
936
974
}
937
975
938
976
if(quit_now){
951
989
if(buffer_length > 0){
952
990
ssize_t decrypted_buffer_size;
953
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
992
&decrypted_buffer, mc);
955
993
if(decrypted_buffer_size >= 0){
956
994
957
995
written = 0;
967
1005
if(ret == 0 and ferror(stdout)){
968
1006
int e = errno;
969
1007
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
973
1010
}
974
1011
errno = e;
975
1012
goto mandos_end;
1006
1043
return retval;
1007
1044
}
1008
1045
1046
__attribute__((nonnull))
1009
1047
static void resolve_callback(AvahiSServiceResolver *r,
1010
1048
AvahiIfIndex interface,
1011
1049
AvahiProtocol proto,
1019
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1059
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1024
1064
1025
1065
/* Called whenever a service has been resolved successfully or
1026
1066
timed out */
1032
1072
switch(event){
1033
1073
default:
1034
1074
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)));
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1039
1080
break;
1040
1081
1041
1082
case AVAHI_RESOLVER_FOUND:
1043
1084
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1085
avahi_address_snprint(ip, sizeof(ip), address);
1045
1086
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);
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
1050
1090
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1053
1095
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1096
avahi_simple_poll_quit(simple_poll);
1055
1097
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
1058
1104
}
1059
1105
}
1060
1106
}
1070
1116
const char *domain,
1071
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1118
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1075
1123
1076
1124
/* Called whenever a new services becomes available on the LAN or
1077
1125
is removed from the LAN */
1084
1132
default:
1085
1133
case AVAHI_BROWSER_FAILURE:
1086
1134
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);
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1091
1139
return;
1092
1140
1093
1141
case AVAHI_BROWSER_NEW:
1096
1144
the callback function is called the Avahi server will free the
1097
1145
resolver for us. */
1098
1146
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)));
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1105
1155
break;
1106
1156
1107
1157
case AVAHI_BROWSER_REMOVE:
1110
1160
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1161
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1162
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
1115
1165
}
1116
1166
break;
1117
1167
}
1126
1176
signal_received = sig;
1127
1177
int old_errno = errno;
1128
1178
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1131
1181
}
1132
1182
errno = old_errno;
1133
1183
}
1134
1184
1185
__attribute__((nonnull, warn_unused_result))
1135
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1187
int ret;
1188
error_t ret_errno;
1137
1189
1138
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1191
if(s < 0){
1192
ret_errno = errno;
1140
1193
perror_plus("socket");
1194
errno = ret_errno;
1141
1195
return false;
1142
1196
}
1143
1197
strcpy(ifr->ifr_name, ifname);
1144
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1199
if(ret == -1){
1146
1200
if(debug){
1201
ret_errno = errno;
1147
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1148
1204
}
1149
1205
return false;
1150
1206
}
1151
1207
return true;
1152
1208
}
1153
1209
1210
__attribute__((nonnull, warn_unused_result))
1154
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1212
1156
1213
/* Reject the loopback device */
1157
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1215
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1161
1218
}
1162
1219
return false;
1163
1220
}
1164
1221
/* Accept point-to-point devices only if connect_to is specified */
1165
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1223
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1169
1226
}
1170
1227
return true;
1171
1228
}
1172
1229
/* Otherwise, reject non-broadcast-capable devices */
1173
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1231
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1177
1234
}
1178
1235
return false;
1179
1236
}
1180
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1238
if(ifr->ifr_flags & IFF_NOARP){
1182
1239
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1185
1242
}
1186
1243
return false;
1187
1244
}
1188
1245
1189
1246
/* Accept this device */
1190
1247
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1249
}
1194
1250
return true;
1195
1251
}
1199
1255
* corresponds to an acceptable network device.
1200
1256
* (This function is passed to scandir(3) as a filter function.)
1201
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1202
1259
int good_interface(const struct dirent *if_entry){
1203
1260
if(if_entry->d_name[0] == '.'){
1204
1261
return 0;
1207
1264
struct ifreq ifr;
1208
1265
if(not get_flags(if_entry->d_name, &ifr)){
1209
1266
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
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1269
1314
int notdotentries(const struct dirent *direntry){
1270
1315
/* Skip "." and ".." */
1271
1316
if(direntry->d_name[0] == '.'
1278
1323
}
1279
1324
1280
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1281
1327
int runnable_hook(const struct dirent *direntry){
1282
1328
int ret;
1283
1329
size_t sret;
1291
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
1338
"abcdefghijklmnopqrstuvwxyz"
1293
1339
"0123456789"
1294
"_-");
1340
"_.-");
1295
1341
if((direntry->d_name)[sret] != '\0'){
1296
1342
/* Contains non-allowed characters */
1297
1343
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1301
1346
}
1302
1347
return 0;
1303
1348
}
1304
1349
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);
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1313
1351
if(ret == -1){
1314
1352
if(debug){
1315
1353
perror_plus("Could not stat hook");
1319
1357
if(not (S_ISREG(st.st_mode))){
1320
1358
/* Not a regular file */
1321
1359
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1325
1362
}
1326
1363
return 0;
1327
1364
}
1328
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1366
/* Not executable */
1330
1367
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1334
1370
}
1335
1371
return 0;
1336
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1337
1377
return 1;
1338
1378
}
1339
1379
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1341
1383
int ret;
1342
1384
struct timespec now;
1343
1385
struct timespec waited_time;
1344
1386
intmax_t block_time;
1345
1387
1346
1388
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");
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1351
1393
}
1352
1394
ret = avahi_simple_poll_iterate(s, -1);
1353
1395
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1358
1399
}
1359
1400
/* the current time */
1360
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1406
/* Calculating in ms how long time between now and server
1366
1407
who we visted longest time ago. Now - last seen. */
1367
1408
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1409
- mc->current_server->last_seen.tv_sec);
1369
1410
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1411
- mc->current_server->last_seen.tv_nsec);
1371
1412
/* total time is 10s/10,000ms.
1372
1413
Converting to s from ms by dividing by 1,000,
1373
1414
and ns to ms by dividing by 1,000,000. */
1375
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1376
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1418
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1381
1422
}
1382
1423
1383
1424
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);
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1388
1429
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1430
avahi_simple_poll_quit(s);
1390
1431
return 0;
1391
1432
}
1392
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1434
&mc->current_server->last_seen);
1394
1435
if(ret == -1){
1395
1436
perror_plus("clock_gettime");
1396
1437
return -1;
1397
1438
}
1398
mc.current_server = mc.current_server->next;
1439
mc->current_server = mc->current_server->next;
1399
1440
block_time = 0; /* Call avahi to find new Mandos
1400
1441
servers, but don't block */
1401
1442
}
1403
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
1445
}
1405
1446
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1447
if(ret > 0 or errno != EINTR){
1407
1448
return (ret != 1) ? ret : 0;
1408
1449
}
1409
1450
}
1410
1451
}
1411
1452
}
1412
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1512
const float delay){
1513
struct dirent **direntries;
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1518
if(debug){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1521
}
1522
} else {
1523
perror_plus("open");
1524
}
1525
return;
1526
}
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1540
if(numhooks == -1){
1541
perror_plus("scandir");
1542
return;
1543
}
1544
struct dirent *direntry;
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1549
if(debug){
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1551
direntry->d_name);
1552
}
1553
pid_t hook_pid = fork();
1554
if(hook_pid == 0){
1555
/* Child */
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1674
perror_plus("close");
1675
} else {
1676
hookdir_fd = -1;
1677
}
1678
close(devnull);
1679
}
1680
1681
__attribute__((nonnull, warn_unused_result))
1682
error_t bring_up_interface(const char *const interface,
1683
const float delay){
1684
error_t old_errno = errno;
1685
int ret;
1686
struct ifreq network;
1687
unsigned int if_index = if_nametoindex(interface);
1688
if(if_index == 0){
1689
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1690
errno = old_errno;
1691
return ENXIO;
1692
}
1693
1694
if(quit_now){
1695
errno = old_errno;
1696
return EINTR;
1697
}
1698
1699
if(not interface_is_up(interface)){
1700
error_t ret_errno = 0, ioctl_errno = 0;
1701
if(not get_flags(interface, &network)){
1702
ret_errno = errno;
1703
fprintf_plus(stderr, "Failed to get flags for interface "
1704
"\"%s\"\n", interface);
1705
errno = old_errno;
1706
return ret_errno;
1707
}
1708
network.ifr_flags |= IFF_UP; /* set flag */
1709
1710
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1711
if(sd == -1){
1712
ret_errno = errno;
1713
perror_plus("socket");
1714
errno = old_errno;
1715
return ret_errno;
1716
}
1717
1718
if(quit_now){
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1720
if(ret == -1){
1721
perror_plus("close");
1722
}
1723
errno = old_errno;
1724
return EINTR;
1725
}
1726
1727
if(debug){
1728
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1729
interface);
1730
}
1731
1732
/* Raise privileges */
1733
ret_errno = raise_privileges();
1734
if(ret_errno != 0){
1735
perror_plus("Failed to raise privileges");
1736
}
1737
1738
#ifdef __linux__
1739
int ret_linux;
1740
bool restore_loglevel = false;
1741
if(ret_errno == 0){
1742
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1743
messages about the network interface to mess up the prompt */
1744
ret_linux = klogctl(8, NULL, 5);
1745
if(ret_linux == -1){
1746
perror_plus("klogctl");
1747
} else {
1748
restore_loglevel = true;
1749
}
1750
}
1751
#endif /* __linux__ */
1752
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1753
ioctl_errno = errno;
1754
#ifdef __linux__
1755
if(restore_loglevel){
1756
ret_linux = klogctl(7, NULL, 0);
1757
if(ret_linux == -1){
1758
perror_plus("klogctl");
1759
}
1760
}
1761
#endif /* __linux__ */
1762
1763
/* If raise_privileges() succeeded above */
1764
if(ret_errno == 0){
1765
/* Lower privileges */
1766
ret_errno = lower_privileges();
1767
if(ret_errno != 0){
1768
errno = ret_errno;
1769
perror_plus("Failed to lower privileges");
1770
}
1771
}
1772
1773
/* Close the socket */
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ioctl_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1782
errno = old_errno;
1783
return ioctl_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1787
interface);
1788
}
1789
1790
/* Sleep checking until interface is running.
1791
Check every 0.25s, up to total time of delay */
1792
for(int i=0; i < delay * 4; i++){
1793
if(interface_is_running(interface)){
1794
break;
1795
}
1796
struct timespec sleeptime = { .tv_nsec = 250000000 };
1797
ret = nanosleep(&sleeptime, NULL);
1798
if(ret == -1 and errno != EINTR){
1799
perror_plus("nanosleep");
1800
}
1801
}
1802
1803
errno = old_errno;
1804
return 0;
1805
}
1806
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t take_down_interface(const char *const interface){
1809
error_t old_errno = errno;
1810
struct ifreq network;
1811
unsigned int if_index = if_nametoindex(interface);
1812
if(if_index == 0){
1813
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1814
errno = old_errno;
1815
return ENXIO;
1816
}
1817
if(interface_is_up(interface)){
1818
error_t ret_errno = 0, ioctl_errno = 0;
1819
if(not get_flags(interface, &network) and debug){
1820
ret_errno = errno;
1821
fprintf_plus(stderr, "Failed to get flags for interface "
1822
"\"%s\"\n", interface);
1823
errno = old_errno;
1824
return ret_errno;
1825
}
1826
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1827
1828
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1829
if(sd == -1){
1830
ret_errno = errno;
1831
perror_plus("socket");
1832
errno = old_errno;
1833
return ret_errno;
1834
}
1835
1836
if(debug){
1837
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1838
interface);
1839
}
1840
1841
/* Raise privileges */
1842
ret_errno = raise_privileges();
1843
if(ret_errno != 0){
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1859
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
if(ret == -1){
1863
perror_plus("close");
1864
}
1865
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
errno = old_errno;
1870
return ioctl_errno;
1871
}
1872
} else if(debug){
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1874
interface);
1875
}
1876
1877
errno = old_errno;
1878
return 0;
1879
}
1880
1413
1881
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1414
1886
AvahiSServiceBrowser *sb = NULL;
1415
int error;
1887
error_t ret_errno;
1416
1888
int ret;
1417
1889
intmax_t tmpmax;
1418
1890
char *tmp;
1419
1891
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;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1428
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
1898
const char *seckey = PATHDIR "/" SECKEY;
1430
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1431
1901
1432
1902
bool gnutls_initialized = false;
1433
1903
bool gpgme_initialized = false;
1495
1965
.group = 2 },
1496
1966
{ .name = "retry", .key = 132,
1497
1967
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1968
.doc = "Retry interval used when denied by the Mandos server",
1499
1969
.group = 2 },
1500
1970
{ .name = "network-hook-dir", .key = 133,
1501
1971
.arg = "DIR",
1524
1994
connect_to = arg;
1525
1995
break;
1526
1996
case 'i': /* --interface */
1527
interface = arg;
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1999
if(ret_errno != 0){
2000
argp_error(state, "%s", strerror(ret_errno));
2001
}
1528
2002
break;
1529
2003
case 's': /* --seckey */
1530
2004
seckey = arg;
1573
2047
argp_state_help(state, state->out_stream,
1574
2048
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
2049
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1578
2051
exit(argp_err_exit_status);
1579
2052
break;
1580
2053
default:
1607
2080
{
1608
2081
/* Work around Debian bug #633582:
1609
2082
<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");
2083
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
1675
2089
} 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
}
2090
struct stat st;
2091
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2093
int seckey_fd = open(seckey, O_RDONLY);
2094
if(seckey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(seckey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2110
}
2111
}
2112
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2115
if(pubkey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(pubkey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2134
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2140
}
2141
}
2142
2143
/* Remove invalid interface names (except "none") */
2144
{
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2147
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2153
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2155
interface = NULL;
2156
}
2157
}
2158
}
2159
2160
/* Run network hooks */
2161
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
2166
goto end;
2167
}
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
1759
2173
}
1760
2174
1761
2175
if(not debug){
1762
2176
avahi_set_log_function(empty_log);
1763
2177
}
1764
2178
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
2179
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1800
2180
from the signal handler */
1801
2181
/* Initialize the pseudo-RNG for Avahi */
1802
2182
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");
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
2185
fprintf_plus(stderr,
2186
"Avahi: Failed to create simple poll object.\n");
1807
2187
exitcode = EX_UNAVAILABLE;
1808
2188
goto end;
1809
2189
}
1871
2251
}
1872
2252
}
1873
2253
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");
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2259
alphasort);
2260
if(ret >= 1){
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("argz_add");
2268
continue;
2269
}
2270
if(debug){
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2273
}
2274
}
2275
free(direntries);
2276
} else {
2277
free(direntries);
2278
fprintf_plus(stderr, "Could not find a network interface\n");
2279
exitcode = EXIT_FAILURE;
2280
goto end;
2281
}
2282
}
2283
2284
/* Bring up interfaces which are down, and remove any "none"s */
2285
{
2286
char *interface = NULL;
2287
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2288
interface))){
2289
/* If interface name is "none", stop bringing up interfaces.
2290
Also remove all instances of "none" from the list */
2291
if(strcmp(interface, "none") == 0){
2292
argz_delete(&mc.interfaces, &mc.interfaces_size,
2293
interface);
2294
interface = NULL;
2295
while((interface = argz_next(mc.interfaces,
2296
mc.interfaces_size, interface))){
2297
if(strcmp(interface, "none") == 0){
2298
argz_delete(&mc.interfaces, &mc.interfaces_size,
2299
interface);
2300
interface = NULL;
1960
2301
}
1961
2302
}
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
2303
break;
1980
2304
}
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
}
2305
bool interface_was_up = interface_is_up(interface);
2306
errno = bring_up_interface(interface, delay);
2307
if(not interface_was_up){
2308
if(errno != 0){
2309
perror_plus("Failed to bring up interface");
2310
} else {
2311
errno = argz_add(&interfaces_to_take_down,
2312
&interfaces_to_take_down_size,
2313
interface);
2314
if(errno != 0){
2315
perror_plus("argz_add");
2316
}
2317
}
2318
}
2319
}
2320
if(debug and (interfaces_to_take_down == NULL)){
2321
fprintf_plus(stderr, "No interfaces were brought up\n");
2322
}
2323
}
2324
2325
/* If we only got one interface, explicitly use only that one */
2326
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2327
if(debug){
2328
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2329
mc.interfaces);
2330
}
2331
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2018
2332
}
2019
2333
2020
2334
if(quit_now){
2021
2335
goto end;
2022
2336
}
2023
2337
2024
ret = init_gnutls_global(pubkey, seckey);
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
2025
2339
if(ret == -1){
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2340
fprintf_plus(stderr, "init_gnutls_global failed\n");
2028
2341
exitcode = EX_UNAVAILABLE;
2029
2342
goto end;
2030
2343
} else {
2035
2348
goto end;
2036
2349
}
2037
2350
2038
if(mkdtemp(tempdir) == NULL){
2351
/* Try /run/tmp before /tmp */
2352
tempdir = mkdtemp(run_tempdir);
2353
if(tempdir == NULL and errno == ENOENT){
2354
if(debug){
2355
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2356
run_tempdir, old_tempdir);
2357
}
2358
tempdir = mkdtemp(old_tempdir);
2359
}
2360
if(tempdir == NULL){
2039
2361
perror_plus("mkdtemp");
2040
2362
goto end;
2041
2363
}
2042
tempdir_created = true;
2043
2364
2044
2365
if(quit_now){
2045
2366
goto end;
2046
2367
}
2047
2368
2048
if(not init_gpgme(pubkey, seckey, tempdir)){
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2369
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2370
fprintf_plus(stderr, "init_gpgme failed\n");
2051
2371
exitcode = EX_UNAVAILABLE;
2052
2372
goto end;
2053
2373
} else {
2062
2382
/* Connect directly, do not use Zeroconf */
2063
2383
/* (Mainly meant for debugging) */
2064
2384
char *address = strrchr(connect_to, ':');
2385
2065
2386
if(address == NULL){
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2387
fprintf_plus(stderr, "No colon in address\n");
2068
2388
exitcode = EX_USAGE;
2069
2389
goto end;
2070
2390
}
2073
2393
goto end;
2074
2394
}
2075
2395
2076
uint16_t port;
2396
in_port_t port;
2077
2397
errno = 0;
2078
2398
tmpmax = strtoimax(address+1, &tmp, 10);
2079
2399
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");
2400
or tmpmax != (in_port_t)tmpmax){
2401
fprintf_plus(stderr, "Bad port number\n");
2083
2402
exitcode = EX_USAGE;
2084
2403
goto end;
2085
2404
}
2086
2405
2087
2406
if(quit_now){
2088
2407
goto end;
2089
2408
}
2090
2409
2091
port = (uint16_t)tmpmax;
2410
port = (in_port_t)tmpmax;
2092
2411
*address = '\0';
2093
2412
/* Colon in address indicates IPv6 */
2094
2413
int af;
2110
2429
}
2111
2430
2112
2431
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2432
ret = start_mandos_communication(address, port, if_index, af,
2433
&mc);
2114
2434
if(quit_now or ret == 0){
2115
2435
break;
2116
2436
}
2117
2437
if(debug){
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2438
fprintf_plus(stderr, "Retrying in %d seconds\n",
2439
(int)retry_interval);
2120
2440
}
2121
sleep((int)retry_interval);
2441
sleep((unsigned int)retry_interval);
2122
2442
}
2123
2443
2124
if (not quit_now){
2444
if(not quit_now){
2125
2445
exitcode = EXIT_SUCCESS;
2126
2446
}
2127
2447
2142
2462
config.publish_domain = 0;
2143
2463
2144
2464
/* Allocate a new server */
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2465
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2466
&config, NULL, NULL, &ret_errno);
2148
2467
2149
2468
/* Free the Avahi configuration data */
2150
2469
avahi_server_config_free(&config);
2152
2471
2153
2472
/* Check if creating the Avahi server object succeeded */
2154
2473
if(mc.server == NULL){
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
2157
avahi_strerror(error));
2474
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2475
avahi_strerror(ret_errno));
2158
2476
exitcode = EX_UNAVAILABLE;
2159
2477
goto end;
2160
2478
}
2166
2484
/* Create the Avahi service browser */
2167
2485
sb = avahi_s_service_browser_new(mc.server, if_index,
2168
2486
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2169
NULL, 0, browse_callback, NULL);
2487
NULL, 0, browse_callback,
2488
(void *)&mc);
2170
2489
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)));
2490
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2491
avahi_strerror(avahi_server_errno(mc.server)));
2174
2492
exitcode = EX_UNAVAILABLE;
2175
2493
goto end;
2176
2494
}
2182
2500
/* Run the main loop */
2183
2501
2184
2502
if(debug){
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2503
fprintf_plus(stderr, "Starting Avahi loop search\n");
2187
2504
}
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2505
2506
ret = avahi_loop_with_timeout(simple_poll,
2507
(int)(retry_interval * 1000), &mc);
2191
2508
if(debug){
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2509
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2510
(ret == 0) ? "successfully" : "with error");
2195
2511
}
2196
2512
2197
2513
end:
2198
2514
2199
2515
if(debug){
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
2516
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2202
2517
}
2203
2518
2204
2519
/* Cleanup things */
2520
free(mc.interfaces);
2521
2205
2522
if(sb != NULL)
2206
2523
avahi_s_service_browser_free(sb);
2207
2524
2208
2525
if(mc.server != NULL)
2209
2526
avahi_server_free(mc.server);
2210
2527
2211
if(mc.simple_poll != NULL)
2212
avahi_simple_poll_free(mc.simple_poll);
2528
if(simple_poll != NULL)
2529
avahi_simple_poll_free(simple_poll);
2213
2530
2214
2531
if(gnutls_initialized){
2215
2532
gnutls_certificate_free_credentials(mc.cred);
2220
2537
if(gpgme_initialized){
2221
2538
gpgme_release(mc.ctx);
2222
2539
}
2223
2540
2224
2541
/* Cleans up the circular linked list of Mandos servers the client
2225
2542
has seen */
2226
2543
if(mc.current_server != NULL){
2232
2549
}
2233
2550
}
2234
2551
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");
2552
/* Re-raise privileges */
2553
{
2554
ret_errno = raise_privileges();
2555
if(ret_errno != 0){
2556
perror_plus("Failed to raise privileges");
2557
} else {
2558
2559
/* Run network hooks */
2560
run_network_hooks("stop", interfaces_hooks != NULL ?
2561
interfaces_hooks : "", delay);
2562
2563
/* Take down the network interfaces which were brought up */
2564
{
2565
char *interface = NULL;
2566
while((interface=argz_next(interfaces_to_take_down,
2567
interfaces_to_take_down_size,
2568
interface))){
2569
ret_errno = take_down_interface(interface);
2570
if(ret_errno != 0){
2571
errno = ret_errno;
2572
perror_plus("Failed to take down interface");
2573
}
2574
}
2575
if(debug and (interfaces_to_take_down == NULL)){
2576
fprintf_plus(stderr, "No interfaces needed to be taken"
2577
" down\n");
2578
}
2579
}
2244
2580
}
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
}
2581
2582
ret_errno = lower_privileges_permanently();
2583
if(ret_errno != 0){
2584
perror_plus("Failed to lower privileges permanently");
2266
2585
}
2267
2586
}
2268
2587
2588
free(interfaces_to_take_down);
2589
free(interfaces_hooks);
2590
2269
2591
/* Removes the GPGME temp directory and all files inside */
2270
if(tempdir_created){
2592
if(tempdir != NULL){
2271
2593
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);
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2595
O_NOFOLLOW));
2596
if(tempdir_fd == -1){
2597
perror_plus("open");
2598
} else {
2599
#ifdef __GLIBC__
2600
#if __GLIBC_PREREQ(2, 15)
2601
int numentries = scandirat(tempdir_fd, ".", &direntries,
2602
notdotentries, alphasort);
2603
#else /* not __GLIBC_PREREQ(2, 15) */
2604
int numentries = scandir(tempdir, &direntries, notdotentries,
2605
alphasort);
2606
#endif /* not __GLIBC_PREREQ(2, 15) */
2607
#else /* not __GLIBC__ */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC__ */
2611
if(numentries > 0){
2612
for(int i = 0; i < numentries; i++){
2613
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2614
if(ret == -1){
2615
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2616
" \"%s\", 0): %s\n", tempdir,
2617
direntries[i]->d_name, strerror(errno));
2618
}
2619
}
2620
2621
/* need to clean even if 0 because man page doesn't specify */
2622
free(direntries);
2623
if(numentries == -1){
2624
perror_plus("scandir");
2625
}
2626
ret = rmdir(tempdir);
2627
if(ret == -1 and errno != ENOENT){
2628
perror_plus("rmdir");
2629
}
2291
2630
}
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");
2631
TEMP_FAILURE_RETRY(close(tempdir_fd));
2302
2632
}
2303
2633
}
2304
2634
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0