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237.7.195
(compared to revision 237.2.131)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2013-12-31 16:02:18 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 307.
- Revision ID: teddy@recompile.se-20131231160218-plmmb0o0iifkd5l2
Specify BusName in systemd service file.
* mandos.service (BusName): Uncommented.
* mandos.service (BusName): Uncommented.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
83
sigaction(), SIGTERM, sig_atomic_t,
84
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
85
94
86
95
#ifdef __linux__
87
96
#include <sys/klog.h> /* klogctl() */
105
114
init_gnutls_session(),
106
115
GNUTLS_* */
107
116
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
110
119
111
120
/* GPGME */
112
121
#include <gpgme.h> /* All GPGME types, constants and
120
129
#define PATHDIR "/conf/conf.d/mandos"
121
130
#define SECKEY "seckey.txt"
122
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
133
124
134
bool debug = false;
125
135
static const char mandos_protocol_version[] = "1";
126
136
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
128
154
129
155
/* Used for passing in values through the Avahi callback functions */
130
156
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
157
AvahiServer *server;
133
158
gnutls_certificate_credentials_t cred;
134
159
unsigned int dh_bits;
135
160
gnutls_dh_params_t dh_params;
136
161
const char *priority;
137
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
138
166
} mandos_context;
139
167
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
170
171
sig_atomic_t quit_now = 0;
172
int signal_received = 0;
173
174
/* Function to use when printing errors */
175
void perror_plus(const char *print_text){
176
int e = errno;
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
179
errno = e;
180
perror(print_text);
181
}
182
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
144
192
145
193
/*
146
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
148
196
* "buffer_length" is how much is already used.
149
197
*/
150
198
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
199
size_t buffer_capacity){
152
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
202
if(buffer == NULL){
159
207
return buffer_capacity;
160
208
}
161
209
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
213
int ret;
214
server *new_server = malloc(sizeof(server));
215
if(new_server == NULL){
216
perror_plus("malloc");
217
return false;
218
}
219
*new_server = (server){ .ip = strdup(ip),
220
.port = port,
221
.if_index = if_index,
222
.af = af };
223
if(new_server->ip == NULL){
224
perror_plus("strdup");
225
return false;
226
}
227
/* Special case of first server */
228
if(*current_server == NULL){
229
new_server->next = new_server;
230
new_server->prev = new_server;
231
*current_server = new_server;
232
/* Place the new server last in the list */
233
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
236
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
return true;
245
}
246
162
247
/*
163
248
* Initialize GPGME.
164
249
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
167
252
gpgme_error_t rc;
168
253
gpgme_engine_info_t engine_info;
169
254
170
171
255
/*
172
256
* Helper function to insert pub and seckey to the engine keyring.
173
257
*/
178
262
179
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
264
if(fd == -1){
181
perror("open");
265
perror_plus("open");
182
266
return false;
183
267
}
184
268
185
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
270
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
189
273
return false;
190
274
}
191
275
192
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
193
277
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
196
280
return false;
197
281
}
198
282
199
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
284
if(ret == -1){
201
perror("close");
285
perror_plus("close");
202
286
}
203
287
gpgme_data_release(pgp_data);
204
288
return true;
205
289
}
206
290
207
291
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
209
293
}
210
294
211
295
/* Init GPGME */
212
296
gpgme_check_version(NULL);
213
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
298
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
217
301
return false;
218
302
}
219
303
220
/* Set GPGME home directory for the OpenPGP engine only */
304
/* Set GPGME home directory for the OpenPGP engine only */
221
305
rc = gpgme_get_engine_info(&engine_info);
222
306
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
225
309
return false;
226
310
}
227
311
while(engine_info != NULL){
233
317
engine_info = engine_info->next;
234
318
}
235
319
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
237
322
return false;
238
323
}
239
324
240
325
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
242
327
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
245
331
return false;
246
332
}
247
333
258
344
*/
259
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
346
size_t crypto_size,
261
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
262
349
gpgme_data_t dh_crypto, dh_plain;
263
350
gpgme_error_t rc;
264
351
ssize_t ret;
266
353
ssize_t plaintext_length = 0;
267
354
268
355
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
357
}
271
358
272
359
/* Create new GPGME data buffer from memory cryptotext */
273
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
361
0);
275
362
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
278
365
return -1;
279
366
}
280
367
281
368
/* Create new empty GPGME data buffer for the plaintext */
282
369
rc = gpgme_data_new(&dh_plain);
283
370
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
286
374
gpgme_data_release(dh_crypto);
287
375
return -1;
288
376
}
289
377
290
378
/* Decrypt data from the cryptotext data buffer to the plaintext
291
379
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
381
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
296
384
plaintext_length = -1;
297
385
if(debug){
298
386
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
300
388
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
390
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
307
395
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
397
}
310
398
gpgme_recipient_t recipient;
311
399
recipient = result->recipients;
312
400
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
319
408
recipient = recipient->next;
320
409
}
321
410
}
324
413
}
325
414
326
415
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
328
417
}
329
418
330
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
421
perror_plus("gpgme_data_seek");
333
422
plaintext_length = -1;
334
423
goto decrypt_end;
335
424
}
337
426
*plaintext = NULL;
338
427
while(true){
339
428
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
341
plaintext_capacity);
429
(size_t)plaintext_length,
430
plaintext_capacity);
342
431
if(plaintext_capacity == 0){
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
346
435
}
347
436
348
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
353
442
break;
354
443
}
355
444
if(ret < 0){
356
perror("gpgme_data_read");
445
perror_plus("gpgme_data_read");
357
446
plaintext_length = -1;
358
447
goto decrypt_end;
359
448
}
361
450
}
362
451
363
452
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
365
454
for(ssize_t i = 0; i < plaintext_length; i++){
366
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
456
}
379
468
}
380
469
381
470
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
384
472
if(ret == NULL)
385
473
ret = "(unknown)";
386
474
return ret;
389
477
/* GnuTLS log function callback */
390
478
static void debuggnutls(__attribute__((unused)) int level,
391
479
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
393
481
}
394
482
395
483
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
397
486
int ret;
398
487
399
488
if(debug){
400
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
401
490
}
402
491
403
492
ret = gnutls_global_init();
404
493
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
407
496
return -1;
408
497
}
409
498
416
505
}
417
506
418
507
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
420
509
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
426
512
gnutls_global_deinit();
427
513
return -1;
428
514
}
429
515
430
516
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
434
521
}
435
522
436
523
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
438
525
GNUTLS_OPENPGP_FMT_BASE64);
439
526
if(ret != GNUTLS_E_SUCCESS){
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
445
532
goto globalfail;
446
533
}
447
534
448
535
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
450
537
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
453
541
goto globalfail;
454
542
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
456
544
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
459
547
goto globalfail;
460
548
}
461
549
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
551
464
552
return 0;
465
553
466
554
globalfail:
467
555
468
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
469
557
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
471
559
return -1;
472
560
}
473
561
474
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
475
564
int ret;
476
565
/* GnuTLS session creation */
477
566
do {
478
567
ret = gnutls_init(session, GNUTLS_SERVER);
568
if(quit_now){
569
return -1;
570
}
479
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
572
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
483
576
}
484
577
485
578
{
486
579
const char *err;
487
580
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
582
if(quit_now){
583
gnutls_deinit(*session);
584
return -1;
585
}
489
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
587
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
494
591
gnutls_deinit(*session);
495
592
return -1;
496
593
}
498
595
499
596
do {
500
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
598
mc->cred);
599
if(quit_now){
600
gnutls_deinit(*session);
601
return -1;
602
}
502
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
604
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
506
607
gnutls_deinit(*session);
507
608
return -1;
508
609
}
510
611
/* ignore client certificate if any. */
511
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
512
613
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
514
615
515
616
return 0;
516
617
}
519
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
520
621
__attribute__((unused)) const char *txt){}
521
622
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
525
623
/* Called when a Mandos server is found */
526
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
527
625
AvahiIfIndex if_index,
528
int af){
626
int af, mandos_context *mc){
529
627
int ret, tcp_sd = -1;
530
628
ssize_t sret;
531
629
union {
533
631
struct sockaddr_in6 in6;
534
632
} to;
535
633
char *buffer = NULL;
536
char *decrypted_buffer;
634
char *decrypted_buffer = NULL;
537
635
size_t buffer_length = 0;
538
636
size_t buffer_capacity = 0;
539
637
size_t written;
540
int retval = 0;
638
int retval = -1;
541
639
gnutls_session_t session;
542
640
int pf; /* Protocol family */
543
641
642
errno = 0;
643
544
644
if(quit_now){
645
errno = EINTR;
545
646
return -1;
546
647
}
547
648
553
654
pf = PF_INET;
554
655
break;
555
656
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
557
659
return -1;
558
660
}
559
661
560
ret = init_gnutls_session(&session);
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
561
695
if(ret != 0){
562
696
return -1;
563
697
}
564
698
565
699
if(debug){
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
568
702
}
569
703
570
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
571
705
if(tcp_sd < 0){
572
perror("socket");
573
retval = -1;
706
int e = errno;
707
perror_plus("socket");
708
errno = e;
574
709
goto mandos_end;
575
710
}
576
711
577
712
if(quit_now){
713
errno = EINTR;
578
714
goto mandos_end;
579
715
}
580
716
587
723
ret = inet_pton(af, ip, &to.in.sin_addr);
588
724
}
589
725
if(ret < 0 ){
590
perror("inet_pton");
591
retval = -1;
726
int e = errno;
727
perror_plus("inet_pton");
728
errno = e;
592
729
goto mandos_end;
593
730
}
594
731
if(ret == 0){
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
732
int e = errno;
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
734
errno = e;
597
735
goto mandos_end;
598
736
}
599
737
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
604
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
607
748
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
749
fprintf_plus(stderr, "An IPv6 link-local address is"
750
" incomplete without a network interface\n");
751
errno = EINVAL;
611
752
goto mandos_end;
612
753
}
613
754
/* Set the network interface number as scope */
614
755
to.in6.sin6_scope_id = (uint32_t)if_index;
615
756
}
616
757
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
758
to.in.sin_port = htons(port);
620
759
}
621
760
622
761
if(quit_now){
762
errno = EINTR;
623
763
goto mandos_end;
624
764
}
625
765
627
767
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
768
char interface[IF_NAMESIZE];
629
769
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
770
perror_plus("if_indextoname");
631
771
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
634
774
}
635
775
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
638
778
}
639
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
647
787
sizeof(addrstr));
648
788
}
649
789
if(pcret == NULL){
650
perror("inet_ntop");
790
perror_plus("inet_ntop");
651
791
} else {
652
792
if(strcmp(addrstr, ip) != 0){
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
654
794
}
655
795
}
656
796
}
657
797
658
798
if(quit_now){
799
errno = EINTR;
659
800
goto mandos_end;
660
801
}
661
802
665
806
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
807
}
667
808
if(ret < 0){
668
perror("connect");
669
retval = -1;
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
int e = errno;
811
perror_plus("connect");
812
errno = e;
813
}
670
814
goto mandos_end;
671
815
}
672
816
673
817
if(quit_now){
818
errno = EINTR;
674
819
goto mandos_end;
675
820
}
676
821
679
824
while(true){
680
825
size_t out_size = strlen(out);
681
826
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
682
out_size - written));
827
out_size - written));
683
828
if(ret == -1){
684
perror("write");
685
retval = -1;
829
int e = errno;
830
perror_plus("write");
831
errno = e;
686
832
goto mandos_end;
687
833
}
688
834
written += (size_t)ret;
698
844
}
699
845
700
846
if(quit_now){
847
errno = EINTR;
701
848
goto mandos_end;
702
849
}
703
850
}
704
851
705
852
if(debug){
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
853
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
707
854
}
708
855
709
856
if(quit_now){
857
errno = EINTR;
710
858
goto mandos_end;
711
859
}
712
860
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
714
866
715
867
if(quit_now){
868
errno = EINTR;
716
869
goto mandos_end;
717
870
}
718
871
719
872
do {
720
873
ret = gnutls_handshake(session);
721
874
if(quit_now){
875
errno = EINTR;
722
876
goto mandos_end;
723
877
}
724
878
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
725
879
726
880
if(ret != GNUTLS_E_SUCCESS){
727
881
if(debug){
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
882
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
729
883
gnutls_perror(ret);
730
884
}
731
retval = -1;
885
errno = EPROTO;
732
886
goto mandos_end;
733
887
}
734
888
735
889
/* Read OpenPGP packet that contains the wanted password */
736
890
737
891
if(debug){
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
892
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
893
" %s\n", ip);
740
894
}
741
895
742
896
while(true){
743
897
744
898
if(quit_now){
899
errno = EINTR;
745
900
goto mandos_end;
746
901
}
747
902
748
903
buffer_capacity = incbuffer(&buffer, buffer_length,
749
buffer_capacity);
904
buffer_capacity);
750
905
if(buffer_capacity == 0){
751
perror("incbuffer");
752
retval = -1;
906
int e = errno;
907
perror_plus("incbuffer");
908
errno = e;
753
909
goto mandos_end;
754
910
}
755
911
756
912
if(quit_now){
913
errno = EINTR;
757
914
goto mandos_end;
758
915
}
759
916
772
929
ret = gnutls_handshake(session);
773
930
774
931
if(quit_now){
932
errno = EINTR;
775
933
goto mandos_end;
776
934
}
777
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
778
936
if(ret < 0){
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
937
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
938
"***\n");
780
939
gnutls_perror(ret);
781
retval = -1;
940
errno = EPROTO;
782
941
goto mandos_end;
783
942
}
784
943
break;
785
944
default:
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
945
fprintf_plus(stderr, "Unknown error while reading data from"
946
" encrypted session with Mandos server\n");
789
947
gnutls_bye(session, GNUTLS_SHUT_RDWR);
948
errno = EIO;
790
949
goto mandos_end;
791
950
}
792
951
} else {
795
954
}
796
955
797
956
if(debug){
798
fprintf(stderr, "Closing TLS session\n");
799
}
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
957
fprintf_plus(stderr, "Closing TLS session\n");
958
}
959
960
if(quit_now){
961
errno = EINTR;
962
goto mandos_end;
963
}
964
965
do {
966
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
967
if(quit_now){
968
errno = EINTR;
969
goto mandos_end;
970
}
971
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
810
972
811
973
if(buffer_length > 0){
812
974
ssize_t decrypted_buffer_size;
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
815
&decrypted_buffer);
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
816
977
if(decrypted_buffer_size >= 0){
817
978
818
979
written = 0;
819
980
while(written < (size_t) decrypted_buffer_size){
820
981
if(quit_now){
982
errno = EINTR;
821
983
goto mandos_end;
822
984
}
823
985
825
987
(size_t)decrypted_buffer_size - written,
826
988
stdout);
827
989
if(ret == 0 and ferror(stdout)){
990
int e = errno;
828
991
if(debug){
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
992
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
993
strerror(errno));
831
994
}
832
retval = -1;
833
break;
995
errno = e;
996
goto mandos_end;
834
997
}
835
998
written += (size_t)ret;
836
999
}
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
1000
retval = 0;
840
1001
}
841
} else {
842
retval = -1;
843
1002
}
844
1003
845
1004
/* Shutdown procedure */
846
1005
847
1006
mandos_end:
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1007
{
1008
int e = errno;
1009
free(decrypted_buffer);
1010
free(buffer);
1011
if(tcp_sd >= 0){
1012
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1013
}
1014
if(ret == -1){
1015
if(e == 0){
1016
e = errno;
1017
}
1018
perror_plus("close");
1019
}
1020
gnutls_deinit(session);
1021
errno = e;
1022
if(quit_now){
1023
errno = EINTR;
1024
retval = -1;
1025
}
858
1026
}
859
1027
return retval;
860
1028
}
872
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
1042
flags,
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
877
1047
878
1048
/* Called whenever a service has been resolved successfully or
879
1049
timed out */
885
1055
switch(event){
886
1056
default:
887
1057
case AVAHI_RESOLVER_FAILURE:
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
891
1063
break;
892
1064
893
1065
case AVAHI_RESOLVER_FOUND:
895
1067
char ip[AVAHI_ADDRESS_STR_MAX];
896
1068
avahi_address_snprint(ip, sizeof(ip), address);
897
1069
if(debug){
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1070
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
host_name, ip, (intmax_t)interface, port);
901
1073
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
904
1078
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
1079
avahi_simple_poll_quit(simple_poll);
1080
} else {
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
906
1087
}
907
1088
}
908
1089
}
918
1099
const char *domain,
919
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
1101
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
923
1106
924
1107
/* Called whenever a new services becomes available on the LAN or
925
1108
is removed from the LAN */
932
1115
default:
933
1116
case AVAHI_BROWSER_FAILURE:
934
1117
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
938
1122
return;
939
1123
940
1124
case AVAHI_BROWSER_NEW:
943
1127
the callback function is called the Avahi server will free the
944
1128
resolver for us. */
945
1129
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
951
1138
break;
952
1139
953
1140
case AVAHI_BROWSER_REMOVE:
956
1143
case AVAHI_BROWSER_ALL_FOR_NOW:
957
1144
case AVAHI_BROWSER_CACHE_EXHAUSTED:
958
1145
if(debug){
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1146
fprintf_plus(stderr, "No Mandos server found, still"
1147
" searching...\n");
960
1148
}
961
1149
break;
962
1150
}
963
1151
}
964
1152
965
/* stop main loop after sigterm has been called */
1153
/* Signal handler that stops main loop after SIGTERM */
966
1154
static void handle_sigterm(int sig){
967
1155
if(quit_now){
968
1156
return;
970
1158
quit_now = 1;
971
1159
signal_received = sig;
972
1160
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
1161
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1164
}
1165
errno = old_errno;
1166
}
1167
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
int ret;
1170
error_t ret_errno;
1171
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
if(s < 0){
1174
ret_errno = errno;
1175
perror_plus("socket");
1176
errno = ret_errno;
1177
return false;
1178
}
1179
strcpy(ifr->ifr_name, ifname);
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
if(ret == -1){
1182
if(debug){
1183
ret_errno = errno;
1184
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
}
1187
return false;
1188
}
1189
return true;
1190
}
1191
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1193
1194
/* Reject the loopback device */
1195
if(ifr->ifr_flags & IFF_LOOPBACK){
1196
if(debug){
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1198
ifname);
1199
}
1200
return false;
1201
}
1202
/* Accept point-to-point devices only if connect_to is specified */
1203
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1204
if(debug){
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1207
}
1208
return true;
1209
}
1210
/* Otherwise, reject non-broadcast-capable devices */
1211
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1212
if(debug){
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1215
}
1216
return false;
1217
}
1218
/* Reject non-ARP interfaces (including dummy interfaces) */
1219
if(ifr->ifr_flags & IFF_NOARP){
1220
if(debug){
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1222
ifname);
1223
}
1224
return false;
1225
}
1226
1227
/* Accept this device */
1228
if(debug){
1229
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1230
}
1231
return true;
1232
}
1233
1234
/*
1235
* This function determines if a directory entry in /sys/class/net
1236
* corresponds to an acceptable network device.
1237
* (This function is passed to scandir(3) as a filter function.)
1238
*/
1239
int good_interface(const struct dirent *if_entry){
1240
if(if_entry->d_name[0] == '.'){
1241
return 0;
1242
}
1243
1244
struct ifreq ifr;
1245
if(not get_flags(if_entry->d_name, &ifr)){
1246
if(debug){
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
if(not good_flags(if_entry->d_name, &ifr)){
1254
return 0;
1255
}
1256
return 1;
1257
}
1258
1259
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1289
}
1290
1291
int notdotentries(const struct dirent *direntry){
1292
/* Skip "." and ".." */
1293
if(direntry->d_name[0] == '.'
1294
and (direntry->d_name[1] == '\0'
1295
or (direntry->d_name[1] == '.'
1296
and direntry->d_name[2] == '\0'))){
1297
return 0;
1298
}
1299
return 1;
1300
}
1301
1302
/* Is this directory entry a runnable program? */
1303
int runnable_hook(const struct dirent *direntry){
1304
int ret;
1305
size_t sret;
1306
struct stat st;
1307
1308
if((direntry->d_name)[0] == '\0'){
1309
/* Empty name? */
1310
return 0;
1311
}
1312
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
"abcdefghijklmnopqrstuvwxyz"
1315
"0123456789"
1316
"_-");
1317
if((direntry->d_name)[sret] != '\0'){
1318
/* Contains non-allowed characters */
1319
if(debug){
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1321
direntry->d_name);
1322
}
1323
return 0;
1324
}
1325
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1334
if(ret == -1){
1335
if(debug){
1336
perror_plus("Could not stat hook");
1337
}
1338
return 0;
1339
}
1340
if(not (S_ISREG(st.st_mode))){
1341
/* Not a regular file */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1349
/* Not executable */
1350
if(debug){
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1352
direntry->d_name);
1353
}
1354
return 0;
1355
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1360
return 1;
1361
}
1362
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1365
int ret;
1366
struct timespec now;
1367
struct timespec waited_time;
1368
intmax_t block_time;
1369
1370
while(true){
1371
if(mc->current_server == NULL){
1372
if (debug){
1373
fprintf_plus(stderr, "Wait until first server is found."
1374
" No timeout!\n");
1375
}
1376
ret = avahi_simple_poll_iterate(s, -1);
1377
} else {
1378
if (debug){
1379
fprintf_plus(stderr, "Check current_server if we should run"
1380
" it, or wait\n");
1381
}
1382
/* the current time */
1383
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1384
if(ret == -1){
1385
perror_plus("clock_gettime");
1386
return -1;
1387
}
1388
/* Calculating in ms how long time between now and server
1389
who we visted longest time ago. Now - last seen. */
1390
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1392
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1394
/* total time is 10s/10,000ms.
1395
Converting to s from ms by dividing by 1,000,
1396
and ns to ms by dividing by 1,000,000. */
1397
block_time = ((retry_interval
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1400
1401
if (debug){
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
block_time);
1404
}
1405
1406
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1411
if(ret == 0){
1412
avahi_simple_poll_quit(s);
1413
return 0;
1414
}
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1417
if(ret == -1){
1418
perror_plus("clock_gettime");
1419
return -1;
1420
}
1421
mc->current_server = mc->current_server->next;
1422
block_time = 0; /* Call avahi to find new Mandos
1423
servers, but don't block */
1424
}
1425
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1427
}
1428
if(ret != 0){
1429
if (ret > 0 or errno != EINTR){
1430
return (ret != 1) ? ret : 0;
1431
}
1432
}
1433
}
1434
}
1435
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1489
const float delay){
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1511
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1582
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1619
}
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
977
1791
}
978
1792
979
1793
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
980
1798
AvahiSServiceBrowser *sb = NULL;
981
int error;
1799
error_t ret_errno;
982
1800
int ret;
983
1801
intmax_t tmpmax;
984
1802
char *tmp;
985
1803
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
993
1806
char tempdir[] = "/tmp/mandosXXXXXX";
994
1807
bool tempdir_created = false;
995
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
1809
const char *seckey = PATHDIR "/" SECKEY;
997
1810
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
998
1813
999
1814
bool gnutls_initialized = false;
1000
1815
bool gpgme_initialized = false;
1001
1816
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1002
1819
1003
struct sigaction old_sigterm_action;
1820
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1004
1821
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1005
1822
1006
1823
uid = getuid();
1010
1827
errno = 0;
1011
1828
ret = setgid(gid);
1012
1829
if(ret == -1){
1013
perror("setgid");
1830
perror_plus("setgid");
1014
1831
}
1015
1832
1016
1833
/* Lower user privileges (temporarily) */
1017
1834
errno = 0;
1018
1835
ret = seteuid(uid);
1019
1836
if(ret == -1){
1020
perror("seteuid");
1837
perror_plus("seteuid");
1021
1838
}
1022
1839
1023
1840
if(quit_now){
1058
1875
.arg = "SECONDS",
1059
1876
.doc = "Maximum delay to wait for interface startup",
1060
1877
.group = 2 },
1878
{ .name = "retry", .key = 132,
1879
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1885
.group = 2 },
1886
/*
1887
* These reproduce what we would get without ARGP_NO_HELP
1888
*/
1889
{ .name = "help", .key = '?',
1890
.doc = "Give this help list", .group = -1 },
1891
{ .name = "usage", .key = -3,
1892
.doc = "Give a short usage message", .group = -1 },
1893
{ .name = "version", .key = 'V',
1894
.doc = "Print program version", .group = -1 },
1061
1895
{ .name = NULL }
1062
1896
};
1063
1897
1064
1898
error_t parse_opt(int key, char *arg,
1065
1899
struct argp_state *state){
1900
errno = 0;
1066
1901
switch(key){
1067
1902
case 128: /* --debug */
1068
1903
debug = true;
1071
1906
connect_to = arg;
1072
1907
break;
1073
1908
case 'i': /* --interface */
1074
interface = arg;
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1075
1914
break;
1076
1915
case 's': /* --seckey */
1077
1916
seckey = arg;
1084
1923
tmpmax = strtoimax(arg, &tmp, 10);
1085
1924
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
1925
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1926
argp_error(state, "Bad number of DH bits");
1089
1927
}
1090
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1091
1929
break;
1096
1934
errno = 0;
1097
1935
delay = strtof(arg, &tmp);
1098
1936
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
1937
argp_error(state, "Bad delay");
1938
}
1939
case 132: /* --retry */
1940
errno = 0;
1941
retry_interval = strtod(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'
1943
or (retry_interval * 1000) > INT_MAX
1944
or retry_interval < 0){
1945
argp_error(state, "Bad retry interval");
1946
}
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1951
/*
1952
* These reproduce what we would get without ARGP_NO_HELP
1953
*/
1954
case '?': /* --help */
1955
argp_state_help(state, state->out_stream,
1956
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1957
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1958
case -3: /* --usage */
1959
argp_state_help(state, state->out_stream,
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
exit(argp_err_exit_status);
1106
1964
break;
1107
1965
default:
1108
1966
return ARGP_ERR_UNKNOWN;
1109
1967
}
1110
return 0;
1968
return errno;
1111
1969
}
1112
1970
1113
1971
struct argp argp = { .options = options, .parser = parse_opt,
1114
1972
.args_doc = "",
1115
1973
.doc = "Mandos client -- Get and decrypt"
1116
1974
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
1978
case 0:
1979
break;
1980
case ENOMEM:
1981
default:
1982
errno = ret;
1983
perror_plus("argp_parse");
1984
exitcode = EX_OSERR;
1985
goto end;
1986
case EINVAL:
1987
exitcode = EX_USAGE;
1988
goto end;
1989
}
1990
}
1991
1992
{
1993
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
1995
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
1121
2079
goto end;
1122
2080
}
1123
2081
}
1130
2088
from the signal handler */
1131
2089
/* Initialize the pseudo-RNG for Avahi */
1132
2090
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
2095
exitcode = EX_UNAVAILABLE;
1137
2096
goto end;
1138
2097
}
1139
2098
1140
2099
sigemptyset(&sigterm_action.sa_mask);
1141
2100
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
2101
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
2102
perror_plus("sigaddset");
2103
exitcode = EX_OSERR;
1145
2104
goto end;
1146
2105
}
1147
2106
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
2107
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
2108
perror_plus("sigaddset");
2109
exitcode = EX_OSERR;
1151
2110
goto end;
1152
2111
}
1153
2112
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
2113
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
2114
perror_plus("sigaddset");
2115
exitcode = EX_OSERR;
1157
2116
goto end;
1158
2117
}
1159
2118
/* Need to check if the handler is SIG_IGN before handling:
1162
2121
*/
1163
2122
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1164
2123
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2124
perror_plus("sigaction");
2125
return EX_OSERR;
1167
2126
}
1168
2127
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
2128
ret = sigaction(SIGINT, &sigterm_action, NULL);
1170
2129
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2130
perror_plus("sigaction");
2131
exitcode = EX_OSERR;
1173
2132
goto end;
1174
2133
}
1175
2134
}
1176
2135
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
2136
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
2137
perror_plus("sigaction");
2138
return EX_OSERR;
1180
2139
}
1181
2140
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
2141
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
2142
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
2143
perror_plus("sigaction");
2144
exitcode = EX_OSERR;
1186
2145
goto end;
1187
2146
}
1188
2147
}
1189
2148
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1190
2149
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2150
perror_plus("sigaction");
2151
return EX_OSERR;
1193
2152
}
1194
2153
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
2154
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1196
2155
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
if(if_index == 0){
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
2156
perror_plus("sigaction");
2157
exitcode = EX_OSERR;
2158
goto end;
2159
}
2160
}
2161
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
1288
2208
}
1289
2209
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
2210
break;
1307
2211
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1345
2237
}
1346
2238
1347
2239
if(quit_now){
1348
2240
goto end;
1349
2241
}
1350
2242
1351
ret = init_gnutls_global(pubkey, seckey);
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
1352
2244
if(ret == -1){
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
2246
exitcode = EX_UNAVAILABLE;
1355
2247
goto end;
1356
2248
} else {
1357
2249
gnutls_initialized = true;
1361
2253
goto end;
1362
2254
}
1363
2255
2256
if(mkdtemp(tempdir) == NULL){
2257
perror_plus("mkdtemp");
2258
goto end;
2259
}
1364
2260
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
1368
goto end;
1369
}
1370
2261
1371
2262
if(quit_now){
1372
2263
goto end;
1373
2264
}
1374
2265
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2267
fprintf_plus(stderr, "init_gpgme failed\n");
2268
exitcode = EX_UNAVAILABLE;
1378
2269
goto end;
1379
2270
} else {
1380
2271
gpgme_initialized = true;
1388
2279
/* Connect directly, do not use Zeroconf */
1389
2280
/* (Mainly meant for debugging) */
1390
2281
char *address = strrchr(connect_to, ':');
2282
1391
2283
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2284
fprintf_plus(stderr, "No colon in address\n");
2285
exitcode = EX_USAGE;
1394
2286
goto end;
1395
2287
}
1396
2288
1398
2290
goto end;
1399
2291
}
1400
2292
1401
uint16_t port;
2293
in_port_t port;
1402
2294
errno = 0;
1403
2295
tmpmax = strtoimax(address+1, &tmp, 10);
1404
2296
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2297
or tmpmax != (in_port_t)tmpmax){
2298
fprintf_plus(stderr, "Bad port number\n");
2299
exitcode = EX_USAGE;
1408
2300
goto end;
1409
2301
}
1410
2302
1411
2303
if(quit_now){
1412
2304
goto end;
1413
2305
}
1414
2306
1415
port = (uint16_t)tmpmax;
2307
port = (in_port_t)tmpmax;
1416
2308
*address = '\0';
1417
address = connect_to;
1418
2309
/* Colon in address indicates IPv6 */
1419
2310
int af;
1420
if(strchr(address, ':') != NULL){
2311
if(strchr(connect_to, ':') != NULL){
1421
2312
af = AF_INET6;
2313
/* Accept [] around IPv6 address - see RFC 5952 */
2314
if(connect_to[0] == '[' and address[-1] == ']')
2315
{
2316
connect_to++;
2317
address[-1] = '\0';
2318
}
1422
2319
} else {
1423
2320
af = AF_INET;
1424
2321
}
2322
address = connect_to;
1425
2323
1426
2324
if(quit_now){
1427
2325
goto end;
1428
2326
}
1429
2327
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
2328
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
2331
if(quit_now or ret == 0){
2332
break;
2333
}
2334
if(debug){
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
(int)retry_interval);
2337
}
2338
sleep((unsigned int)retry_interval);
2339
}
2340
2341
if (not quit_now){
1434
2342
exitcode = EXIT_SUCCESS;
1435
2343
}
2344
1436
2345
goto end;
1437
2346
}
1438
2347
1450
2359
config.publish_domain = 0;
1451
2360
1452
2361
/* Allocate a new server */
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
1456
2364
1457
2365
/* Free the Avahi configuration data */
1458
2366
avahi_server_config_free(&config);
1460
2368
1461
2369
/* Check if creating the Avahi server object succeeded */
1462
2370
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
2373
exitcode = EX_UNAVAILABLE;
1466
2374
goto end;
1467
2375
}
1468
2376
1473
2381
/* Create the Avahi service browser */
1474
2382
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
2383
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
1477
2386
if(sb == NULL){
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
avahi_strerror(avahi_server_errno(mc.server)));
2389
exitcode = EX_UNAVAILABLE;
1481
2390
goto end;
1482
2391
}
1483
2392
1488
2397
/* Run the main loop */
1489
2398
1490
2399
if(debug){
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2401
}
2402
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2405
if(debug){
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
(ret == 0) ? "successfully" : "with error");
2408
}
1495
2409
1496
2410
end:
1497
2411
1498
2412
if(debug){
1499
fprintf(stderr, "%s exiting\n", argv[0]);
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1500
2414
}
1501
2415
1502
2416
/* Cleanup things */
2417
free(mc.interfaces);
2418
1503
2419
if(sb != NULL)
1504
2420
avahi_s_service_browser_free(sb);
1505
2421
1506
2422
if(mc.server != NULL)
1507
2423
avahi_server_free(mc.server);
1508
2424
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
1511
2427
1512
2428
if(gnutls_initialized){
1513
2429
gnutls_certificate_free_credentials(mc.cred);
1519
2435
gpgme_release(mc.ctx);
1520
2436
}
1521
2437
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
2438
/* Cleans up the circular linked list of Mandos servers the client
2439
has seen */
2440
if(mc.current_server != NULL){
2441
mc.current_server->prev->next = NULL;
2442
while(mc.current_server != NULL){
2443
server *next = mc.current_server->next;
2444
free(mc.current_server);
2445
mc.current_server = next;
1529
2446
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
2447
}
2448
2449
/* Re-raise priviliges */
2450
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
1539
2467
}
1540
2468
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
1550
2472
}
1551
2473
}
2474
2475
lower_privileges_permanently();
1552
2476
}
1553
2477
1554
/* Removes the temp directory used by GPGME */
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2480
2481
/* Removes the GPGME temp directory and all files inside */
1555
2482
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
2483
struct dirent **direntries = NULL;
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
2489
direntry = direntries[i];
1576
2490
char *fullname = NULL;
1577
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
2492
direntry->d_name);
1579
2493
if(ret < 0){
1580
perror("asprintf");
2494
perror_plus("asprintf");
1581
2495
continue;
1582
2496
}
1583
2497
ret = remove(fullname);
1584
2498
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
1587
2501
}
1588
2502
free(fullname);
1589
2503
}
1590
closedir(d);
2504
}
2505
2506
/* need to clean even if 0 because man page doesn't specify */
2507
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
1591
2510
}
1592
2511
ret = rmdir(tempdir);
1593
2512
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
2513
perror_plus("rmdir");
1595
2514
}
1596
2515
}
1597
2516
1598
2517
if(quit_now){
1599
2518
sigemptyset(&old_sigterm_action.sa_mask);
1600
2519
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2520
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2521
&old_sigterm_action,
2522
NULL));
1602
2523
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
2524
perror_plus("sigaction");
2525
}
2526
do {
2527
ret = raise(signal_received);
2528
} while(ret != 0 and errno == EINTR);
2529
if(ret != 0){
2530
perror_plus("raise");
2531
abort();
2532
}
2533
TEMP_FAILURE_RETRY(pause());
1606
2534
}
1607
2535
1608
2536
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0