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- Committer: Teddy Hogeborn
- Date: 2014-03-27 21:24:33 UTC
- Revision ID: teddy@recompile.se-20140327212433-oxdvfg1vsaagc6v0
Use fnmatch()in plugin-runner.
* plugin-runner.c (main): Use fnmatch().
* plugin-runner.c (main): Use fnmatch().
- files added:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
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* "browse_callback", and parts of "main".
10
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*
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* Everything else is
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* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
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* This program is free software: you can redistribute it and/or
16
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* modify it under the terms of the GNU General Public License as
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
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#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
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*/
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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strtoimax() */
64
#include <assert.h> /* assert() */
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65
#include <errno.h> /* perror(), errno,
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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
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
87
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
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WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
90
97
91
98
#ifdef __linux__
92
99
#include <sys/klog.h> /* klogctl() */
129
136
130
137
bool debug = false;
131
138
static const char mandos_protocol_version[] = "1";
132
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
134
141
static const char sys_class_net[] = "/sys/class/net";
135
142
char *connect_to = NULL;
136
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
137
146
138
147
/* Doubly linked list that need to be circularly linked when used */
139
148
typedef struct server{
140
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const char *ip;
141
uint16_t port;
150
in_port_t port;
142
151
AvahiIfIndex if_index;
143
152
int af;
144
153
struct timespec last_seen;
148
157
149
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/* Used for passing in values through the Avahi callback functions */
150
159
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
160
AvahiServer *server;
153
161
gnutls_certificate_credentials_t cred;
154
162
unsigned int dh_bits;
156
164
const char *priority;
157
165
gpgme_ctx_t ctx;
158
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
159
169
} mandos_context;
160
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/* 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 };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
166
173
167
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sig_atomic_t quit_now = 0;
168
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int signal_received = 0;
169
176
170
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/* Function to use when printing errors */
171
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void perror_plus(const char *print_text){
179
int e = errno;
172
180
fprintf(stderr, "Mandos plugin %s: ",
173
181
program_invocation_short_name);
182
errno = e;
174
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perror(print_text);
175
184
}
176
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__attribute__((format (gnu_printf, 2, 3), nonnull))
177
187
int fprintf_plus(FILE *stream, const char *format, ...){
178
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va_list ap;
179
189
va_start (ap, format);
180
190
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
194
}
184
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/*
187
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* bytes. "buffer_capacity" is how much is currently allocated,
188
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* "buffer_length" is how much is already used.
189
200
*/
201
__attribute__((nonnull, warn_unused_result))
190
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size_t incbuffer(char **buffer, size_t buffer_length,
191
203
size_t buffer_capacity){
192
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
195
211
return 0;
196
212
}
213
*buffer = new_buf;
197
214
buffer_capacity += BUFFER_SIZE;
198
215
}
199
216
return buffer_capacity;
200
217
}
201
218
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219
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
205
223
int ret;
206
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server *new_server = malloc(sizeof(server));
207
225
if(new_server == NULL){
208
226
perror_plus("malloc");
209
return -1;
227
return false;
210
228
}
211
229
*new_server = (server){ .ip = strdup(ip),
212
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.port = port,
214
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.af = af };
215
233
if(new_server->ip == NULL){
216
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perror_plus("strdup");
217
return -1;
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
218
241
}
219
242
/* Special case of first server */
220
if (mc.current_server == NULL){
243
if(*current_server == NULL){
221
244
new_server->next = new_server;
222
245
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
246
*current_server = new_server;
225
247
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
228
251
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
252
(*current_server)->prev = new_server;
253
}
254
return true;
237
255
}
238
256
239
257
/*
240
258
* Initialize GPGME.
241
259
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
244
265
gpgme_error_t rc;
245
266
gpgme_engine_info_t engine_info;
246
267
247
248
268
/*
249
269
* Helper function to insert pub and seckey to the engine keyring.
250
270
*/
251
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
252
272
int ret;
253
273
int fd;
254
274
gpgme_data_t pgp_data;
261
281
262
282
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
283
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
267
286
return false;
268
287
}
269
288
270
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
271
290
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
275
293
return false;
276
294
}
277
295
284
302
}
285
303
286
304
if(debug){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
305
fprintf_plus(stderr, "Initializing GPGME\n");
289
306
}
290
307
291
308
/* Init GPGME */
292
309
gpgme_check_version(NULL);
293
310
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
311
if(rc != GPG_ERR_NO_ERROR){
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
298
314
return false;
299
315
}
300
316
301
317
/* Set GPGME home directory for the OpenPGP engine only */
302
318
rc = gpgme_get_engine_info(&engine_info);
303
319
if(rc != GPG_ERR_NO_ERROR){
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
307
322
return false;
308
323
}
309
324
while(engine_info != NULL){
315
330
engine_info = engine_info->next;
316
331
}
317
332
if(engine_info == NULL){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", tempdir);
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
320
335
return false;
321
336
}
322
337
323
338
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
325
340
if(rc != GPG_ERR_NO_ERROR){
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
329
344
return false;
330
345
}
331
346
340
355
* Decrypt OpenPGP data.
341
356
* Returns -1 on error
342
357
*/
358
__attribute__((nonnull, warn_unused_result))
343
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
360
size_t crypto_size,
345
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
346
363
gpgme_data_t dh_crypto, dh_plain;
347
364
gpgme_error_t rc;
348
365
ssize_t ret;
350
367
ssize_t plaintext_length = 0;
351
368
352
369
if(debug){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
355
371
}
356
372
357
373
/* Create new GPGME data buffer from memory cryptotext */
358
374
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
359
375
0);
360
376
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
364
379
return -1;
365
380
}
366
381
367
382
/* Create new empty GPGME data buffer for the plaintext */
368
383
rc = gpgme_data_new(&dh_plain);
369
384
if(rc != GPG_ERR_NO_ERROR){
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
373
388
gpgme_data_release(dh_crypto);
374
389
return -1;
375
390
}
376
391
377
392
/* Decrypt data from the cryptotext data buffer to the plaintext
378
393
data buffer */
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
380
395
if(rc != GPG_ERR_NO_ERROR){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
384
398
plaintext_length = -1;
385
399
if(debug){
386
400
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
388
402
if(result == NULL){
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
391
404
} else {
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
397
result->wrong_key_usage);
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
398
409
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
401
411
}
402
412
gpgme_recipient_t recipient;
403
413
recipient = result->recipients;
404
414
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
412
recipient->status == GPG_ERR_NO_SECKEY
413
? "No" : "Yes");
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
414
422
recipient = recipient->next;
415
423
}
416
424
}
419
427
}
420
428
421
429
if(debug){
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
424
431
}
425
432
426
433
/* Seek back to the beginning of the GPGME plaintext data buffer */
457
464
}
458
465
459
466
if(debug){
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
467
fprintf_plus(stderr, "Decrypted password is: ");
462
468
for(ssize_t i = 0; i < plaintext_length; i++){
463
469
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
470
}
475
481
return plaintext_length;
476
482
}
477
483
478
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value); /* Spurious warning from
480
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
481
487
if(ret == NULL)
482
488
ret = "(unknown)";
483
489
return ret;
484
490
}
485
491
486
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
487
494
static void debuggnutls(__attribute__((unused)) int level,
488
495
const char* string){
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
496
fprintf_plus(stderr, "GnuTLS: %s", string);
490
497
}
491
498
499
__attribute__((nonnull, warn_unused_result))
492
500
static int init_gnutls_global(const char *pubkeyfilename,
493
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
494
503
int ret;
495
504
496
505
if(debug){
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
499
507
}
500
508
501
509
ret = gnutls_global_init();
502
510
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
505
513
return -1;
506
514
}
507
515
514
522
}
515
523
516
524
/* OpenPGP credentials */
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
518
526
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
521
529
gnutls_global_deinit();
522
530
return -1;
523
531
}
524
532
525
533
if(debug){
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
528
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
529
seckeyfilename);
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
530
538
}
531
539
532
540
ret = gnutls_certificate_set_openpgp_key_file
533
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
534
542
GNUTLS_OPENPGP_FMT_BASE64);
535
543
if(ret != GNUTLS_E_SUCCESS){
536
fprintf(stderr,
537
"Mandos plugin mandos-client: "
538
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
544
fprintf_plus(stderr,
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
542
549
goto globalfail;
543
550
}
544
551
545
552
/* GnuTLS server initialization */
546
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
547
554
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
550
" %s\n", safer_gnutls_strerror(ret));
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
551
558
goto globalfail;
552
559
}
553
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
554
561
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
557
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
558
564
goto globalfail;
559
565
}
560
566
561
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
562
568
563
569
return 0;
564
570
565
571
globalfail:
566
572
567
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
568
574
gnutls_global_deinit();
569
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
570
576
return -1;
571
577
}
572
578
573
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
574
582
int ret;
575
583
/* GnuTLS session creation */
576
584
do {
580
588
}
581
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
582
590
if(ret != GNUTLS_E_SUCCESS){
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
585
safer_gnutls_strerror(ret));
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
586
594
}
587
595
588
596
{
589
597
const char *err;
590
598
do {
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
592
600
if(quit_now){
593
601
gnutls_deinit(*session);
594
602
return -1;
595
603
}
596
604
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
605
if(ret != GNUTLS_E_SUCCESS){
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
602
609
gnutls_deinit(*session);
603
610
return -1;
604
611
}
606
613
607
614
do {
608
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
609
mc.cred);
616
mc->cred);
610
617
if(quit_now){
611
618
gnutls_deinit(*session);
612
619
return -1;
613
620
}
614
621
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
615
622
if(ret != GNUTLS_E_SUCCESS){
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
618
safer_gnutls_strerror(ret));
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
619
625
gnutls_deinit(*session);
620
626
return -1;
621
627
}
623
629
/* ignore client certificate if any. */
624
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
625
631
626
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
627
633
628
634
return 0;
629
635
}
633
639
__attribute__((unused)) const char *txt){}
634
640
635
641
/* Called when a Mandos server is found */
636
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
637
644
AvahiIfIndex if_index,
638
int af){
645
int af, mandos_context *mc){
639
646
int ret, tcp_sd = -1;
640
647
ssize_t sret;
641
union {
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
644
} to;
648
struct sockaddr_storage to;
645
649
char *buffer = NULL;
646
650
char *decrypted_buffer = NULL;
647
651
size_t buffer_length = 0;
666
670
pf = PF_INET;
667
671
break;
668
672
default:
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
671
674
errno = EINVAL;
672
675
return -1;
673
676
}
674
677
675
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
676
711
if(ret != 0){
677
712
return -1;
678
713
}
679
714
680
715
if(debug){
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
683
"\n", ip, port);
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
684
718
}
685
719
686
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
698
732
699
733
memset(&to, 0, sizeof(to));
700
734
if(af == AF_INET6){
701
to.in6.sin6_family = (sa_family_t)af;
702
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
703
737
} else { /* IPv4 */
704
to.in.sin_family = (sa_family_t)af;
705
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
706
740
}
707
741
if(ret < 0 ){
708
742
int e = errno;
712
746
}
713
747
if(ret == 0){
714
748
int e = errno;
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
717
750
errno = e;
718
751
goto mandos_end;
719
752
}
720
753
if(af == AF_INET6){
721
to.in6.sin6_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
724
725
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
727
-Wunreachable-code*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
728
757
if(if_index == AVAHI_IF_UNSPEC){
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
731
" without a network interface\n");
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
732
760
errno = EINVAL;
733
761
goto mandos_end;
734
762
}
735
763
/* Set the network interface number as scope */
736
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
737
765
}
738
766
} else {
739
to.in.sin_port = htons(port); /* Spurious warnings from
740
-Wconversion and
741
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
742
768
}
743
769
744
770
if(quit_now){
752
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
779
perror_plus("if_indextoname");
754
780
} else {
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
757
ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
758
783
}
759
784
} else {
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
762
787
}
763
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
765
const char *pcret;
766
790
if(af == AF_INET6){
767
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
768
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
769
795
} else {
770
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
771
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
772
800
}
773
if(pcret == NULL){
774
perror_plus("inet_ntop");
775
} else {
776
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
779
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
780
807
}
781
808
}
782
809
786
813
}
787
814
788
815
if(af == AF_INET6){
789
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
790
818
} else {
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
792
821
}
793
822
if(ret < 0){
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
795
824
int e = errno;
796
825
perror_plus("connect");
797
826
errno = e;
835
864
}
836
865
837
866
if(debug){
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
840
868
}
841
869
842
870
if(quit_now){
844
872
goto mandos_end;
845
873
}
846
874
847
/* Spurious warning from -Wint-to-pointer-cast */
848
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
849
880
850
881
if(quit_now){
851
882
errno = EINTR;
862
893
863
894
if(ret != GNUTLS_E_SUCCESS){
864
895
if(debug){
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
867
897
gnutls_perror(ret);
868
898
}
869
899
errno = EPROTO;
873
903
/* Read OpenPGP packet that contains the wanted password */
874
904
875
905
if(debug){
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
878
908
}
879
909
880
910
while(true){
918
948
}
919
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
920
950
if(ret < 0){
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
923
953
gnutls_perror(ret);
924
954
errno = EPROTO;
925
955
goto mandos_end;
926
956
}
927
957
break;
928
958
default:
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
931
" encrypted session with Mandos server\n");
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
932
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
933
962
errno = EIO;
934
963
goto mandos_end;
939
968
}
940
969
941
970
if(debug){
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
971
fprintf_plus(stderr, "Closing TLS session\n");
944
972
}
945
973
946
974
if(quit_now){
959
987
if(buffer_length > 0){
960
988
ssize_t decrypted_buffer_size;
961
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
962
&decrypted_buffer);
990
&decrypted_buffer, mc);
963
991
if(decrypted_buffer_size >= 0){
964
992
965
993
written = 0;
975
1003
if(ret == 0 and ferror(stdout)){
976
1004
int e = errno;
977
1005
if(debug){
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
980
strerror(errno));
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
981
1008
}
982
1009
errno = e;
983
1010
goto mandos_end;
1014
1041
return retval;
1015
1042
}
1016
1043
1044
__attribute__((nonnull))
1017
1045
static void resolve_callback(AvahiSServiceResolver *r,
1018
1046
AvahiIfIndex interface,
1019
1047
AvahiProtocol proto,
1027
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
1028
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1057
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1032
1062
1033
1063
/* Called whenever a service has been resolved successfully or
1034
1064
timed out */
1040
1070
switch(event){
1041
1071
default:
1042
1072
case AVAHI_RESOLVER_FAILURE:
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
1045
" of type '%s' in domain '%s': %s\n", name, type, domain,
1046
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1047
1078
break;
1048
1079
1049
1080
case AVAHI_RESOLVER_FOUND:
1051
1082
char ip[AVAHI_ADDRESS_STR_MAX];
1052
1083
avahi_address_snprint(ip, sizeof(ip), address);
1053
1084
if(debug){
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
1056
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
ip, (intmax_t)interface, port);
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
1058
1088
}
1059
int ret = start_mandos_communication(ip, port, interface,
1060
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1061
1093
if(ret == 0){
1062
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1063
1095
} else {
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
1066
1102
}
1067
1103
}
1068
1104
}
1078
1114
const char *domain,
1079
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1080
1116
flags,
1081
AVAHI_GCC_UNUSED void* userdata){
1082
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1083
1121
1084
1122
/* Called whenever a new services becomes available on the LAN or
1085
1123
is removed from the LAN */
1092
1130
default:
1093
1131
case AVAHI_BROWSER_FAILURE:
1094
1132
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
1097
avahi_strerror(avahi_server_errno(mc.server)));
1098
avahi_simple_poll_quit(mc.simple_poll);
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1099
1137
return;
1100
1138
1101
1139
case AVAHI_BROWSER_NEW:
1104
1142
the callback function is called the Avahi server will free the
1105
1143
resolver for us. */
1106
1144
1107
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1108
name, type, domain, protocol, 0,
1109
resolve_callback, NULL) == NULL)
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
1112
name, avahi_strerror(avahi_server_errno(mc.server)));
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1113
1153
break;
1114
1154
1115
1155
case AVAHI_BROWSER_REMOVE:
1118
1158
case AVAHI_BROWSER_ALL_FOR_NOW:
1119
1159
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1120
1160
if(debug){
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
1123
1163
}
1124
1164
break;
1125
1165
}
1134
1174
signal_received = sig;
1135
1175
int old_errno = errno;
1136
1176
/* set main loop to exit */
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1139
1179
}
1140
1180
errno = old_errno;
1141
1181
}
1142
1182
1183
__attribute__((nonnull, warn_unused_result))
1143
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1144
1185
int ret;
1186
error_t ret_errno;
1145
1187
1146
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1147
1189
if(s < 0){
1190
ret_errno = errno;
1148
1191
perror_plus("socket");
1192
errno = ret_errno;
1149
1193
return false;
1150
1194
}
1151
1195
strcpy(ifr->ifr_name, ifname);
1152
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1153
1197
if(ret == -1){
1154
1198
if(debug){
1199
ret_errno = errno;
1155
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1156
1202
}
1157
1203
return false;
1158
1204
}
1159
1205
return true;
1160
1206
}
1161
1207
1208
__attribute__((nonnull, warn_unused_result))
1162
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1163
1210
1164
1211
/* Reject the loopback device */
1165
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1166
1213
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1169
1216
}
1170
1217
return false;
1171
1218
}
1172
1219
/* Accept point-to-point devices only if connect_to is specified */
1173
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1174
1221
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1177
1224
}
1178
1225
return true;
1179
1226
}
1180
1227
/* Otherwise, reject non-broadcast-capable devices */
1181
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1182
1229
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1185
1232
}
1186
1233
return false;
1187
1234
}
1188
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
1236
if(ifr->ifr_flags & IFF_NOARP){
1190
1237
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1193
1240
}
1194
1241
return false;
1195
1242
}
1196
1243
1197
1244
/* Accept this device */
1198
1245
if(debug){
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1201
1247
}
1202
1248
return true;
1203
1249
}
1207
1253
* corresponds to an acceptable network device.
1208
1254
* (This function is passed to scandir(3) as a filter function.)
1209
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1210
1257
int good_interface(const struct dirent *if_entry){
1211
1258
if(if_entry->d_name[0] == '.'){
1212
1259
return 0;
1215
1262
struct ifreq ifr;
1216
1263
if(not get_flags(if_entry->d_name, &ifr)){
1217
1264
if(debug){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1277
1312
int notdotentries(const struct dirent *direntry){
1278
1313
/* Skip "." and ".." */
1279
1314
if(direntry->d_name[0] == '.'
1286
1321
}
1287
1322
1288
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1289
1325
int runnable_hook(const struct dirent *direntry){
1290
1326
int ret;
1291
1327
size_t sret;
1303
1339
if((direntry->d_name)[sret] != '\0'){
1304
1340
/* Contains non-allowed characters */
1305
1341
if(debug){
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1309
1344
}
1310
1345
return 0;
1311
1346
}
1327
1362
if(not (S_ISREG(st.st_mode))){
1328
1363
/* Not a regular file */
1329
1364
if(debug){
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1366
direntry->d_name);
1333
1367
}
1334
1368
return 0;
1335
1369
}
1336
1370
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
1371
/* Not executable */
1338
1372
if(debug){
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1374
direntry->d_name);
1342
1375
}
1343
1376
return 0;
1344
1377
}
1378
if(debug){
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
direntry->d_name);
1381
}
1345
1382
return 1;
1346
1383
}
1347
1384
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1349
1388
int ret;
1350
1389
struct timespec now;
1351
1390
struct timespec waited_time;
1352
1391
intmax_t block_time;
1353
1392
1354
1393
while(true){
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1394
if(mc->current_server == NULL){
1395
if(debug){
1396
fprintf_plus(stderr, "Wait until first server is found."
1397
" No timeout!\n");
1359
1398
}
1360
1399
ret = avahi_simple_poll_iterate(s, -1);
1361
1400
} else {
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1401
if(debug){
1402
fprintf_plus(stderr, "Check current_server if we should run"
1403
" it, or wait\n");
1366
1404
}
1367
1405
/* the current time */
1368
1406
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1373
1411
/* Calculating in ms how long time between now and server
1374
1412
who we visted longest time ago. Now - last seen. */
1375
1413
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1414
- mc->current_server->last_seen.tv_sec);
1377
1415
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1416
- mc->current_server->last_seen.tv_nsec);
1379
1417
/* total time is 10s/10,000ms.
1380
1418
Converting to s from ms by dividing by 1,000,
1381
1419
and ns to ms by dividing by 1,000,000. */
1383
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1384
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1385
1423
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1424
if(debug){
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
block_time);
1389
1427
}
1390
1428
1391
1429
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1396
1434
if(ret == 0){
1397
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1398
1436
return 0;
1399
1437
}
1400
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1439
&mc->current_server->last_seen);
1402
1440
if(ret == -1){
1403
1441
perror_plus("clock_gettime");
1404
1442
return -1;
1405
1443
}
1406
mc.current_server = mc.current_server->next;
1444
mc->current_server = mc->current_server->next;
1407
1445
block_time = 0; /* Call avahi to find new Mandos
1408
1446
servers, but don't block */
1409
1447
}
1411
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1412
1450
}
1413
1451
if(ret != 0){
1414
if (ret > 0 or errno != EINTR){
1452
if(ret > 0 or errno != EINTR){
1415
1453
return (ret != 1) ? ret : 0;
1416
1454
}
1417
1455
}
1418
1456
}
1419
1457
}
1420
1458
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1517
const float delay){
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
1521
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
1539
perror_plus("asprintf");
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
1615
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1627
} else {
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
#ifdef __linux__
1723
int ret_linux;
1724
if(ret_errno == 0){
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1730
} else {
1731
restore_loglevel = true;
1732
}
1733
}
1734
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
ret_linux = klogctl(7, NULL, 0);
1740
if(ret_linux == -1){
1741
perror_plus("klogctl");
1742
}
1743
}
1744
#endif /* __linux__ */
1745
1746
/* If raise_privileges() succeeded above */
1747
if(ret_errno == 0){
1748
/* Lower privileges */
1749
ret_errno = lower_privileges();
1750
if(ret_errno != 0){
1751
errno = ret_errno;
1752
perror_plus("Failed to lower privileges");
1753
}
1754
}
1755
1756
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1758
if(ret == -1){
1759
perror_plus("close");
1760
}
1761
1762
if(ret_setflags == -1){
1763
errno = ioctl_errno;
1764
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1765
errno = old_errno;
1766
return ioctl_errno;
1767
}
1768
} else if(debug){
1769
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1770
interface);
1771
}
1772
1773
/* Sleep checking until interface is running.
1774
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
1776
if(interface_is_running(interface)){
1777
break;
1778
}
1779
struct timespec sleeptime = { .tv_nsec = 250000000 };
1780
ret = nanosleep(&sleeptime, NULL);
1781
if(ret == -1 and errno != EINTR){
1782
perror_plus("nanosleep");
1783
}
1784
}
1785
1786
errno = old_errno;
1787
return 0;
1788
}
1789
1790
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
1793
struct ifreq network;
1794
unsigned int if_index = if_nametoindex(interface);
1795
if(if_index == 0){
1796
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1797
errno = old_errno;
1798
return ENXIO;
1799
}
1800
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
if(not get_flags(interface, &network) and debug){
1803
ret_errno = errno;
1804
fprintf_plus(stderr, "Failed to get flags for interface "
1805
"\"%s\"\n", interface);
1806
errno = old_errno;
1807
return ret_errno;
1808
}
1809
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1810
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
if(sd == -1){
1813
ret_errno = errno;
1814
perror_plus("socket");
1815
errno = old_errno;
1816
return ret_errno;
1817
}
1818
1819
if(debug){
1820
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1821
interface);
1822
}
1823
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1826
if(ret_errno != 0){
1827
perror_plus("Failed to raise privileges");
1828
}
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1831
1832
/* If raise_privileges() succeeded above */
1833
if(ret_errno == 0){
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1836
if(ret_errno != 0){
1837
errno = ret_errno;
1838
perror_plus("Failed to lower privileges");
1839
}
1840
}
1841
1842
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1844
if(ret == -1){
1845
perror_plus("close");
1846
}
1847
1848
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1851
errno = old_errno;
1852
return ioctl_errno;
1853
}
1854
} else if(debug){
1855
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1856
interface);
1857
}
1858
1859
errno = old_errno;
1860
return 0;
1861
}
1862
1421
1863
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
1422
1868
AvahiSServiceBrowser *sb = NULL;
1423
int error;
1869
error_t ret_errno;
1424
1870
int ret;
1425
1871
intmax_t tmpmax;
1426
1872
char *tmp;
1427
1873
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
1429
struct ifreq network;
1430
int sd = -1;
1431
bool take_down_interface = false;
1432
uid_t uid;
1433
gid_t gid;
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1435
bool tempdir_created = false;
1874
char *interfaces_to_take_down = NULL;
1875
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
1436
1879
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1437
1880
const char *seckey = PATHDIR "/" SECKEY;
1438
1881
const char *pubkey = PATHDIR "/" PUBKEY;
1882
char *interfaces_hooks = NULL;
1439
1883
1440
1884
bool gnutls_initialized = false;
1441
1885
bool gpgme_initialized = false;
1503
1947
.group = 2 },
1504
1948
{ .name = "retry", .key = 132,
1505
1949
.arg = "SECONDS",
1506
.doc = "Retry interval used when denied by the mandos server",
1950
.doc = "Retry interval used when denied by the Mandos server",
1507
1951
.group = 2 },
1508
1952
{ .name = "network-hook-dir", .key = 133,
1509
1953
.arg = "DIR",
1532
1976
connect_to = arg;
1533
1977
break;
1534
1978
case 'i': /* --interface */
1535
interface = arg;
1979
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1980
arg, (int)',');
1981
if(ret_errno != 0){
1982
argp_error(state, "%s", strerror(ret_errno));
1983
}
1536
1984
break;
1537
1985
case 's': /* --seckey */
1538
1986
seckey = arg;
1581
2029
argp_state_help(state, state->out_stream,
1582
2030
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
2031
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
2032
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1586
2033
exit(argp_err_exit_status);
1587
2034
break;
1588
2035
default:
1615
2062
{
1616
2063
/* Work around Debian bug #633582:
1617
2064
<http://bugs.debian.org/633582> */
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
2065
2066
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2070
perror_plus("Failed to raise privileges");
1683
2071
} else {
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1771
}
2072
struct stat st;
2073
2074
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2075
int seckey_fd = open(seckey, O_RDONLY);
2076
if(seckey_fd == -1){
2077
perror_plus("open");
2078
} else {
2079
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2080
if(ret == -1){
2081
perror_plus("fstat");
2082
} else {
2083
if(S_ISREG(st.st_mode)
2084
and st.st_uid == 0 and st.st_gid == 0){
2085
ret = fchown(seckey_fd, uid, gid);
2086
if(ret == -1){
2087
perror_plus("fchown");
2088
}
2089
}
2090
}
2091
TEMP_FAILURE_RETRY(close(seckey_fd));
2092
}
2093
}
2094
2095
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2096
int pubkey_fd = open(pubkey, O_RDONLY);
2097
if(pubkey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(pubkey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(pubkey_fd));
2113
}
2114
}
2115
2116
/* Lower privileges */
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2120
perror_plus("Failed to lower privileges");
2121
}
2122
}
2123
}
2124
2125
/* Remove invalid interface names (except "none") */
2126
{
2127
char *interface = NULL;
2128
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2129
interface))){
2130
if(strcmp(interface, "none") != 0
2131
and if_nametoindex(interface) == 0){
2132
if(interface[0] != '\0'){
2133
fprintf_plus(stderr, "Not using nonexisting interface"
2134
" \"%s\"\n", interface);
2135
}
2136
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2137
interface = NULL;
2138
}
2139
}
2140
}
2141
2142
/* Run network hooks */
2143
{
2144
if(mc.interfaces != NULL){
2145
interfaces_hooks = malloc(mc.interfaces_size);
2146
if(interfaces_hooks == NULL){
2147
perror_plus("malloc");
2148
goto end;
2149
}
2150
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2152
}
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
1772
2155
}
1773
2156
1774
2157
if(not debug){
1775
2158
avahi_set_log_function(empty_log);
1776
2159
}
1777
2160
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
2161
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
2162
from the signal handler */
1814
2163
/* Initialize the pseudo-RNG for Avahi */
1815
2164
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
2165
simple_poll = avahi_simple_poll_new();
2166
if(simple_poll == NULL){
2167
fprintf_plus(stderr,
2168
"Avahi: Failed to create simple poll object.\n");
1820
2169
exitcode = EX_UNAVAILABLE;
1821
2170
goto end;
1822
2171
}
1884
2233
}
1885
2234
}
1886
2235
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1894
goto end;
1895
}
1896
1897
if(quit_now){
1898
goto end;
1899
}
1900
1901
/* Re-raise priviliges */
1902
errno = 0;
1903
ret = seteuid(0);
1904
if(ret == -1){
1905
perror_plus("seteuid");
1906
}
1907
1908
#ifdef __linux__
1909
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1911
ret = klogctl(8, NULL, 5);
1912
bool restore_loglevel = true;
1913
if(ret == -1){
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1916
}
1917
#endif /* __linux__ */
1918
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
if(sd < 0){
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1923
#ifdef __linux__
1924
if(restore_loglevel){
1925
ret = klogctl(7, NULL, 0);
1926
if(ret == -1){
1927
perror_plus("klogctl");
1928
}
1929
}
1930
#endif /* __linux__ */
1931
/* Lower privileges */
1932
errno = 0;
1933
ret = seteuid(uid);
1934
if(ret == -1){
1935
perror_plus("seteuid");
1936
}
1937
goto end;
1938
}
1939
strcpy(network.ifr_name, interface);
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
if(ret == -1){
1942
perror_plus("ioctl SIOCGIFFLAGS");
1943
#ifdef __linux__
1944
if(restore_loglevel){
1945
ret = klogctl(7, NULL, 0);
1946
if(ret == -1){
1947
perror_plus("klogctl");
1948
}
1949
}
1950
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
if((network.ifr_flags & IFF_UP) == 0){
1961
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
if(ret == -1){
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1968
#ifdef __linux__
1969
if(restore_loglevel){
1970
ret = klogctl(7, NULL, 0);
1971
if(ret == -1){
1972
perror_plus("klogctl");
2236
/* If no interfaces were specified, make a list */
2237
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2239
/* Look for any good interfaces */
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2241
alphasort);
2242
if(ret >= 1){
2243
/* Add all found interfaces to interfaces list */
2244
for(int i = 0; i < ret; ++i){
2245
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2246
direntries[i]->d_name);
2247
if(ret_errno != 0){
2248
errno = ret_errno;
2249
perror_plus("argz_add");
2250
continue;
2251
}
2252
if(debug){
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
direntries[i]->d_name);
2255
}
2256
}
2257
free(direntries);
2258
} else {
2259
free(direntries);
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2261
exitcode = EXIT_FAILURE;
2262
goto end;
2263
}
2264
}
2265
2266
/* Bring up interfaces which are down, and remove any "none"s */
2267
{
2268
char *interface = NULL;
2269
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2270
interface))){
2271
/* If interface name is "none", stop bringing up interfaces.
2272
Also remove all instances of "none" from the list */
2273
if(strcmp(interface, "none") == 0){
2274
argz_delete(&mc.interfaces, &mc.interfaces_size,
2275
interface);
2276
interface = NULL;
2277
while((interface = argz_next(mc.interfaces,
2278
mc.interfaces_size, interface))){
2279
if(strcmp(interface, "none") == 0){
2280
argz_delete(&mc.interfaces, &mc.interfaces_size,
2281
interface);
2282
interface = NULL;
1973
2283
}
1974
2284
}
1975
#endif /* __linux__ */
1976
/* Lower privileges */
1977
errno = 0;
1978
ret = seteuid(uid);
1979
if(ret == -1){
1980
perror_plus("seteuid");
1981
}
1982
goto end;
1983
}
1984
}
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1987
for(int i=0; i < delay * 4; i++){
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
if(ret == -1){
1990
perror_plus("ioctl SIOCGIFFLAGS");
1991
} else if(network.ifr_flags & IFF_RUNNING){
1992
2285
break;
1993
2286
}
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
ret = nanosleep(&sleeptime, NULL);
1996
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1998
}
1999
}
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
if(ret == -1){
2004
perror_plus("close");
2005
}
2006
}
2007
#ifdef __linux__
2008
if(restore_loglevel){
2009
/* Restores kernel loglevel to default */
2010
ret = klogctl(7, NULL, 0);
2011
if(ret == -1){
2012
perror_plus("klogctl");
2013
}
2014
}
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2017
errno = 0;
2018
if(take_down_interface){
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2024
} else {
2025
/* Lower privileges permanently */
2026
ret = setuid(uid);
2027
if(ret == -1){
2028
perror_plus("setuid");
2029
}
2030
}
2287
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2289
if(not interface_was_up){
2290
if(errno != 0){
2291
perror_plus("Failed to bring up interface");
2292
} else {
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2295
interface);
2296
if(errno != 0){
2297
perror_plus("argz_add");
2298
}
2299
}
2300
}
2301
}
2302
if(debug and (interfaces_to_take_down == NULL)){
2303
fprintf_plus(stderr, "No interfaces were brought up\n");
2304
}
2305
}
2306
2307
/* If we only got one interface, explicitly use only that one */
2308
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2309
if(debug){
2310
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2311
mc.interfaces);
2312
}
2313
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2031
2314
}
2032
2315
2033
2316
if(quit_now){
2034
2317
goto end;
2035
2318
}
2036
2319
2037
ret = init_gnutls_global(pubkey, seckey);
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
2038
2321
if(ret == -1){
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2322
fprintf_plus(stderr, "init_gnutls_global failed\n");
2041
2323
exitcode = EX_UNAVAILABLE;
2042
2324
goto end;
2043
2325
} else {
2048
2330
goto end;
2049
2331
}
2050
2332
2051
if(mkdtemp(tempdir) == NULL){
2333
/* Try /run/tmp before /tmp */
2334
tempdir = mkdtemp(run_tempdir);
2335
if(tempdir == NULL and errno == ENOENT){
2336
if(debug){
2337
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2338
run_tempdir, old_tempdir);
2339
}
2340
tempdir = mkdtemp(old_tempdir);
2341
}
2342
if(tempdir == NULL){
2052
2343
perror_plus("mkdtemp");
2053
2344
goto end;
2054
2345
}
2055
tempdir_created = true;
2056
2346
2057
2347
if(quit_now){
2058
2348
goto end;
2059
2349
}
2060
2350
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2351
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2352
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2353
exitcode = EX_UNAVAILABLE;
2065
2354
goto end;
2066
2355
} else {
2075
2364
/* Connect directly, do not use Zeroconf */
2076
2365
/* (Mainly meant for debugging) */
2077
2366
char *address = strrchr(connect_to, ':');
2367
2078
2368
if(address == NULL){
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
2369
fprintf_plus(stderr, "No colon in address\n");
2081
2370
exitcode = EX_USAGE;
2082
2371
goto end;
2083
2372
}
2086
2375
goto end;
2087
2376
}
2088
2377
2089
uint16_t port;
2378
in_port_t port;
2090
2379
errno = 0;
2091
2380
tmpmax = strtoimax(address+1, &tmp, 10);
2092
2381
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2093
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
2382
or tmpmax != (in_port_t)tmpmax){
2383
fprintf_plus(stderr, "Bad port number\n");
2096
2384
exitcode = EX_USAGE;
2097
2385
goto end;
2098
2386
}
2099
2387
2100
2388
if(quit_now){
2101
2389
goto end;
2102
2390
}
2103
2391
2104
port = (uint16_t)tmpmax;
2392
port = (in_port_t)tmpmax;
2105
2393
*address = '\0';
2106
2394
/* Colon in address indicates IPv6 */
2107
2395
int af;
2123
2411
}
2124
2412
2125
2413
while(not quit_now){
2126
ret = start_mandos_communication(address, port, if_index, af);
2414
ret = start_mandos_communication(address, port, if_index, af,
2415
&mc);
2127
2416
if(quit_now or ret == 0){
2128
2417
break;
2129
2418
}
2130
2419
if(debug){
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2420
fprintf_plus(stderr, "Retrying in %d seconds\n",
2421
(int)retry_interval);
2133
2422
}
2134
sleep((int)retry_interval);
2423
sleep((unsigned int)retry_interval);
2135
2424
}
2136
2425
2137
if (not quit_now){
2426
if(not quit_now){
2138
2427
exitcode = EXIT_SUCCESS;
2139
2428
}
2140
2429
2155
2444
config.publish_domain = 0;
2156
2445
2157
2446
/* Allocate a new server */
2158
mc.server = avahi_server_new(avahi_simple_poll_get
2159
(mc.simple_poll), &config, NULL,
2160
NULL, &error);
2447
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2448
&config, NULL, NULL, &ret_errno);
2161
2449
2162
2450
/* Free the Avahi configuration data */
2163
2451
avahi_server_config_free(&config);
2165
2453
2166
2454
/* Check if creating the Avahi server object succeeded */
2167
2455
if(mc.server == NULL){
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2456
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2457
avahi_strerror(ret_errno));
2171
2458
exitcode = EX_UNAVAILABLE;
2172
2459
goto end;
2173
2460
}
2179
2466
/* Create the Avahi service browser */
2180
2467
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
2468
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2469
NULL, 0, browse_callback,
2470
(void *)&mc);
2183
2471
if(sb == NULL){
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
2186
avahi_strerror(avahi_server_errno(mc.server)));
2472
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2473
avahi_strerror(avahi_server_errno(mc.server)));
2187
2474
exitcode = EX_UNAVAILABLE;
2188
2475
goto end;
2189
2476
}
2195
2482
/* Run the main loop */
2196
2483
2197
2484
if(debug){
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2485
fprintf_plus(stderr, "Starting Avahi loop search\n");
2200
2486
}
2201
2487
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2488
ret = avahi_loop_with_timeout(simple_poll,
2489
(int)(retry_interval * 1000), &mc);
2204
2490
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2491
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2492
(ret == 0) ? "successfully" : "with error");
2208
2493
}
2209
2494
2210
2495
end:
2211
2496
2212
2497
if(debug){
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
2498
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2215
2499
}
2216
2500
2217
2501
/* Cleanup things */
2502
free(mc.interfaces);
2503
2218
2504
if(sb != NULL)
2219
2505
avahi_s_service_browser_free(sb);
2220
2506
2221
2507
if(mc.server != NULL)
2222
2508
avahi_server_free(mc.server);
2223
2509
2224
if(mc.simple_poll != NULL)
2225
avahi_simple_poll_free(mc.simple_poll);
2510
if(simple_poll != NULL)
2511
avahi_simple_poll_free(simple_poll);
2226
2512
2227
2513
if(gnutls_initialized){
2228
2514
gnutls_certificate_free_credentials(mc.cred);
2233
2519
if(gpgme_initialized){
2234
2520
gpgme_release(mc.ctx);
2235
2521
}
2236
2522
2237
2523
/* Cleans up the circular linked list of Mandos servers the client
2238
2524
has seen */
2239
2525
if(mc.current_server != NULL){
2245
2531
}
2246
2532
}
2247
2533
2248
/* XXX run network hooks "stop" here */
2249
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2253
errno = 0;
2254
ret = seteuid(0);
2255
if(ret == -1){
2256
perror_plus("seteuid");
2534
/* Re-raise privileges */
2535
{
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
2538
perror_plus("Failed to raise privileges");
2539
} else {
2540
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2544
2545
/* Take down the network interfaces which were brought up */
2546
{
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
2554
perror_plus("Failed to take down interface");
2555
}
2556
}
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2559
" down\n");
2560
}
2561
}
2257
2562
}
2258
if(geteuid() == 0){
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2265
if(ret == -1){
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
}
2268
}
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
2565
perror_plus("Failed to lower privileges permanently");
2279
2566
}
2280
2567
}
2281
2568
2569
free(interfaces_to_take_down);
2570
free(interfaces_hooks);
2571
2282
2572
/* Removes the GPGME temp directory and all files inside */
2283
if(tempdir_created){
2573
if(tempdir != NULL){
2284
2574
struct dirent **direntries = NULL;
2285
2575
struct dirent *direntry = NULL;
2286
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
2577
alphasort);
2288
if (numentries > 0){
2578
if(numentries > 0){
2289
2579
for(int i = 0; i < numentries; i++){
2290
2580
direntry = direntries[i];
2291
2581
char *fullname = NULL;
2297
2587
}
2298
2588
ret = remove(fullname);
2299
2589
if(ret == -1){
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2590
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2591
strerror(errno));
2302
2592
}
2303
2593
free(fullname);
2304
2594
}
2306
2596
2307
2597
/* need to clean even if 0 because man page doesn't specify */
2308
2598
free(direntries);
2309
if (numentries == -1){
2599
if(numentries == -1){
2310
2600
perror_plus("scandir");
2311
2601
}
2312
2602
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0