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237.7.20
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2011-03-08 19:09:03 UTC
- mto: (24.1.171 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 282.
- Revision ID: teddy@fukt.bsnet.se-20110308190903-j499ebtb9bpk31ar
* INSTALL: Updated.
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.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, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
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() */
97
87
98
88
#ifdef __linux__
99
89
#include <sys/klog.h> /* klogctl() */
117
107
init_gnutls_session(),
118
108
GNUTLS_* */
119
109
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
122
112
123
113
/* GPGME */
124
114
#include <gpgme.h> /* All GPGME types, constants and
132
122
#define PATHDIR "/conf/conf.d/mandos"
133
123
#define SECKEY "seckey.txt"
134
124
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
125
137
126
bool debug = false;
138
127
static const char mandos_protocol_version[] = "1";
139
128
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
130
static const char sys_class_net[] = "/sys/class/net";
142
131
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
157
132
158
133
/* Used for passing in values through the Avahi callback functions */
159
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
160
136
AvahiServer *server;
161
137
gnutls_certificate_credentials_t cred;
162
138
unsigned int dh_bits;
163
139
gnutls_dh_params_t dh_params;
164
140
const char *priority;
165
141
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
142
} mandos_context;
170
143
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
148
174
149
sig_atomic_t quit_now = 0;
175
150
int signal_received = 0;
176
151
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
152
/*
197
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
154
* bytes. "buffer_capacity" is how much is currently allocated,
199
155
* "buffer_length" is how much is already used.
200
156
*/
201
157
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
158
size_t buffer_capacity){
203
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
210
162
return 0;
211
163
}
212
*buffer = new_buf;
213
164
buffer_capacity += BUFFER_SIZE;
214
165
}
215
166
return buffer_capacity;
216
167
}
217
168
218
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
221
int ret;
222
server *new_server = malloc(sizeof(server));
223
if(new_server == NULL){
224
perror_plus("malloc");
225
return false;
226
}
227
*new_server = (server){ .ip = strdup(ip),
228
.port = port,
229
.if_index = if_index,
230
.af = af };
231
if(new_server->ip == NULL){
232
perror_plus("strdup");
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
239
}
240
/* Special case of first server */
241
if(*current_server == NULL){
242
new_server->next = new_server;
243
new_server->prev = new_server;
244
*current_server = new_server;
245
/* Place the new server last in the list */
246
} else {
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
249
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
251
}
252
return true;
253
}
254
255
169
/*
256
170
* Initialize GPGME.
257
171
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
260
174
gpgme_error_t rc;
261
175
gpgme_engine_info_t engine_info;
262
176
177
263
178
/*
264
179
* Helper function to insert pub and seckey to the engine keyring.
265
180
*/
270
185
271
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
272
187
if(fd == -1){
273
perror_plus("open");
188
perror("open");
274
189
return false;
275
190
}
276
191
277
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
278
193
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
281
196
return false;
282
197
}
283
198
284
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
285
200
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
288
203
return false;
289
204
}
290
205
291
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
292
207
if(ret == -1){
293
perror_plus("close");
208
perror("close");
294
209
}
295
210
gpgme_data_release(pgp_data);
296
211
return true;
297
212
}
298
213
299
214
if(debug){
300
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
301
216
}
302
217
303
218
/* Init GPGME */
304
219
gpgme_check_version(NULL);
305
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
306
221
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
309
224
return false;
310
225
}
311
226
312
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
313
228
rc = gpgme_get_engine_info(&engine_info);
314
229
if(rc != GPG_ERR_NO_ERROR){
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
317
232
return false;
318
233
}
319
234
while(engine_info != NULL){
325
240
engine_info = engine_info->next;
326
241
}
327
242
if(engine_info == NULL){
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
330
244
return false;
331
245
}
332
246
333
247
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
335
249
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
339
252
return false;
340
253
}
341
254
352
265
*/
353
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
267
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
268
char **plaintext){
357
269
gpgme_data_t dh_crypto, dh_plain;
358
270
gpgme_error_t rc;
359
271
ssize_t ret;
361
273
ssize_t plaintext_length = 0;
362
274
363
275
if(debug){
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
365
277
}
366
278
367
279
/* Create new GPGME data buffer from memory cryptotext */
368
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
369
281
0);
370
282
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
373
285
return -1;
374
286
}
375
287
376
288
/* Create new empty GPGME data buffer for the plaintext */
377
289
rc = gpgme_data_new(&dh_plain);
378
290
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
382
293
gpgme_data_release(dh_crypto);
383
294
return -1;
384
295
}
385
296
386
297
/* Decrypt data from the cryptotext data buffer to the plaintext
387
298
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
300
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
392
303
plaintext_length = -1;
393
304
if(debug){
394
305
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
396
307
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
398
309
} else {
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
403
314
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
405
316
}
406
317
gpgme_recipient_t recipient;
407
318
recipient = result->recipients;
408
319
while(recipient != NULL){
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
416
326
recipient = recipient->next;
417
327
}
418
328
}
421
331
}
422
332
423
333
if(debug){
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
425
335
}
426
336
427
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
428
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
429
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
430
340
plaintext_length = -1;
431
341
goto decrypt_end;
432
342
}
434
344
*plaintext = NULL;
435
345
while(true){
436
346
plaintext_capacity = incbuffer(plaintext,
437
(size_t)plaintext_length,
438
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
439
349
if(plaintext_capacity == 0){
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
443
353
}
444
354
445
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
360
break;
451
361
}
452
362
if(ret < 0){
453
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
454
364
plaintext_length = -1;
455
365
goto decrypt_end;
456
366
}
458
368
}
459
369
460
370
if(debug){
461
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
462
372
for(ssize_t i = 0; i < plaintext_length; i++){
463
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
374
}
476
386
}
477
387
478
388
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
480
391
if(ret == NULL)
481
392
ret = "(unknown)";
482
393
return ret;
485
396
/* GnuTLS log function callback */
486
397
static void debuggnutls(__attribute__((unused)) int level,
487
398
const char* string){
488
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
489
400
}
490
401
491
402
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
403
const char *seckeyfilename){
494
404
int ret;
495
405
496
406
if(debug){
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
498
408
}
499
409
500
410
ret = gnutls_global_init();
501
411
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
504
414
return -1;
505
415
}
506
416
513
423
}
514
424
515
425
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
517
427
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
520
433
gnutls_global_deinit();
521
434
return -1;
522
435
}
523
436
524
437
if(debug){
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
529
441
}
530
442
531
443
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
533
445
GNUTLS_OPENPGP_FMT_BASE64);
534
446
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
540
452
goto globalfail;
541
453
}
542
454
543
455
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
545
457
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
549
460
goto globalfail;
550
461
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
463
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
555
466
goto globalfail;
556
467
}
557
468
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
470
560
471
return 0;
561
472
562
473
globalfail:
563
474
564
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
565
476
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
567
478
return -1;
568
479
}
569
480
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
572
482
int ret;
573
483
/* GnuTLS session creation */
574
484
do {
578
488
}
579
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
490
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
584
493
}
585
494
586
495
{
587
496
const char *err;
588
497
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
499
if(quit_now){
591
500
gnutls_deinit(*session);
592
501
return -1;
593
502
}
594
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
595
504
if(ret != GNUTLS_E_SUCCESS){
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
599
508
gnutls_deinit(*session);
600
509
return -1;
601
510
}
603
512
604
513
do {
605
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
515
mc.cred);
607
516
if(quit_now){
608
517
gnutls_deinit(*session);
609
518
return -1;
610
519
}
611
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
612
521
if(ret != GNUTLS_E_SUCCESS){
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
615
524
gnutls_deinit(*session);
616
525
return -1;
617
526
}
619
528
/* ignore client certificate if any. */
620
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
530
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
532
624
533
return 0;
625
534
}
629
538
__attribute__((unused)) const char *txt){}
630
539
631
540
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
633
542
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
543
int af){
635
544
int ret, tcp_sd = -1;
636
545
ssize_t sret;
637
struct sockaddr_storage to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
638
550
char *buffer = NULL;
639
551
char *decrypted_buffer = NULL;
640
552
size_t buffer_length = 0;
659
571
pf = PF_INET;
660
572
break;
661
573
default:
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
663
575
errno = EINVAL;
664
576
return -1;
665
577
}
666
578
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
700
580
if(ret != 0){
701
581
return -1;
702
582
}
703
583
704
584
if(debug){
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
707
587
}
708
588
709
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
710
590
if(tcp_sd < 0){
711
591
int e = errno;
712
perror_plus("socket");
592
perror("socket");
713
593
errno = e;
714
594
goto mandos_end;
715
595
}
721
601
722
602
memset(&to, 0, sizeof(to));
723
603
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
726
606
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
729
609
}
730
610
if(ret < 0 ){
731
611
int e = errno;
732
perror_plus("inet_pton");
612
perror("inet_pton");
733
613
errno = e;
734
614
goto mandos_end;
735
615
}
736
616
if(ret == 0){
737
617
int e = errno;
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
739
619
errno = e;
740
620
goto mandos_end;
741
621
}
742
622
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
746
630
if(if_index == AVAHI_IF_UNSPEC){
747
fprintf_plus(stderr, "An IPv6 link-local address is"
748
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
749
633
errno = EINVAL;
750
634
goto mandos_end;
751
635
}
752
636
/* Set the network interface number as scope */
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
637
to.in6.sin6_scope_id = (uint32_t)if_index;
754
638
}
755
639
} else {
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
757
643
}
758
644
759
645
if(quit_now){
765
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
766
652
char interface[IF_NAMESIZE];
767
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
768
perror_plus("if_indextoname");
654
perror("if_indextoname");
769
655
} else {
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
772
658
}
773
659
} else {
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
776
662
}
777
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
778
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
779
666
if(af == AF_INET6){
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
784
669
} else {
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
789
672
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
796
679
}
797
680
}
798
681
802
685
}
803
686
804
687
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
807
689
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
810
691
}
811
692
if(ret < 0){
812
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
694
int e = errno;
814
perror_plus("connect");
695
perror("connect");
815
696
errno = e;
816
697
}
817
698
goto mandos_end;
827
708
while(true){
828
709
size_t out_size = strlen(out);
829
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
830
out_size - written));
711
out_size - written));
831
712
if(ret == -1){
832
713
int e = errno;
833
perror_plus("write");
714
perror("write");
834
715
errno = e;
835
716
goto mandos_end;
836
717
}
853
734
}
854
735
855
736
if(debug){
856
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
857
738
}
858
739
859
740
if(quit_now){
861
742
goto mandos_end;
862
743
}
863
744
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
869
746
870
747
if(quit_now){
871
748
errno = EINTR;
882
759
883
760
if(ret != GNUTLS_E_SUCCESS){
884
761
if(debug){
885
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
886
763
gnutls_perror(ret);
887
764
}
888
765
errno = EPROTO;
892
769
/* Read OpenPGP packet that contains the wanted password */
893
770
894
771
if(debug){
895
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
896
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
897
774
}
898
775
899
776
while(true){
904
781
}
905
782
906
783
buffer_capacity = incbuffer(&buffer, buffer_length,
907
buffer_capacity);
784
buffer_capacity);
908
785
if(buffer_capacity == 0){
909
786
int e = errno;
910
perror_plus("incbuffer");
787
perror("incbuffer");
911
788
errno = e;
912
789
goto mandos_end;
913
790
}
937
814
}
938
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
939
816
if(ret < 0){
940
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
941
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
942
818
gnutls_perror(ret);
943
819
errno = EPROTO;
944
820
goto mandos_end;
945
821
}
946
822
break;
947
823
default:
948
fprintf_plus(stderr, "Unknown error while reading data from"
949
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
950
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
951
827
errno = EIO;
952
828
goto mandos_end;
957
833
}
958
834
959
835
if(debug){
960
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
961
837
}
962
838
963
839
if(quit_now){
975
851
976
852
if(buffer_length > 0){
977
853
ssize_t decrypted_buffer_size;
978
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
979
&decrypted_buffer, mc);
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
980
857
if(decrypted_buffer_size >= 0){
981
858
982
859
written = 0;
992
869
if(ret == 0 and ferror(stdout)){
993
870
int e = errno;
994
871
if(debug){
995
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
996
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
997
874
}
998
875
errno = e;
999
876
goto mandos_end;
1018
895
if(e == 0){
1019
896
e = errno;
1020
897
}
1021
perror_plus("close");
898
perror("close");
1022
899
}
1023
900
gnutls_deinit(session);
1024
errno = e;
1025
901
if(quit_now){
1026
errno = EINTR;
902
e = EINTR;
1027
903
retval = -1;
1028
904
}
905
errno = e;
1029
906
}
1030
907
return retval;
1031
908
}
1043
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
922
flags,
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1050
925
1051
926
/* Called whenever a service has been resolved successfully or
1052
927
timed out */
1058
933
switch(event){
1059
934
default:
1060
935
case AVAHI_RESOLVER_FAILURE:
1061
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1062
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1063
domain,
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1066
939
break;
1067
940
1068
941
case AVAHI_RESOLVER_FOUND:
1070
943
char ip[AVAHI_ADDRESS_STR_MAX];
1071
944
avahi_address_snprint(ip, sizeof(ip), address);
1072
945
if(debug){
1073
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1074
PRIdMAX ") on port %" PRIu16 "\n", name,
1075
host_name, ip, (intmax_t)interface, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1076
949
}
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1081
952
if(ret == 0){
1082
avahi_simple_poll_quit(simple_poll);
1083
} else {
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1087
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
" list\n", name);
1089
}
953
avahi_simple_poll_quit(mc.simple_poll);
1090
954
}
1091
955
}
1092
956
}
1102
966
const char *domain,
1103
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
968
flags,
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1109
971
1110
972
/* Called whenever a new services becomes available on the LAN or
1111
973
is removed from the LAN */
1118
980
default:
1119
981
case AVAHI_BROWSER_FAILURE:
1120
982
1121
fprintf_plus(stderr, "(Avahi browser) %s\n",
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1125
986
return;
1126
987
1127
988
case AVAHI_BROWSER_NEW:
1130
991
the callback function is called the Avahi server will free the
1131
992
resolver for us. */
1132
993
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1137
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1138
" %s\n", name,
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1141
999
break;
1142
1000
1143
1001
case AVAHI_BROWSER_REMOVE:
1146
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1147
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1148
1006
if(debug){
1149
fprintf_plus(stderr, "No Mandos server found, still"
1150
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1151
1008
}
1152
1009
break;
1153
1010
}
1154
1011
}
1155
1012
1156
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1157
1014
static void handle_sigterm(int sig){
1158
1015
if(quit_now){
1159
1016
return;
1161
1018
quit_now = 1;
1162
1019
signal_received = sig;
1163
1020
int old_errno = errno;
1164
/* set main loop to exit */
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1167
1023
}
1168
1024
errno = old_errno;
1169
1025
}
1170
1026
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
int ret;
1173
error_t ret_errno;
1174
1175
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
if(s < 0){
1177
ret_errno = errno;
1178
perror_plus("socket");
1179
errno = ret_errno;
1180
return false;
1181
}
1182
strcpy(ifr->ifr_name, ifname);
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
if(ret == -1){
1185
if(debug){
1186
ret_errno = errno;
1187
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1189
}
1190
return false;
1191
}
1192
return true;
1193
}
1194
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1196
1197
/* Reject the loopback device */
1198
if(ifr->ifr_flags & IFF_LOOPBACK){
1199
if(debug){
1200
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1201
ifname);
1202
}
1203
return false;
1204
}
1205
/* Accept point-to-point devices only if connect_to is specified */
1206
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1207
if(debug){
1208
fprintf_plus(stderr, "Accepting point-to-point interface"
1209
" \"%s\"\n", ifname);
1210
}
1211
return true;
1212
}
1213
/* Otherwise, reject non-broadcast-capable devices */
1214
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1217
" \"%s\"\n", ifname);
1218
}
1219
return false;
1220
}
1221
/* Reject non-ARP interfaces (including dummy interfaces) */
1222
if(ifr->ifr_flags & IFF_NOARP){
1223
if(debug){
1224
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1225
ifname);
1226
}
1227
return false;
1228
}
1229
1230
/* Accept this device */
1231
if(debug){
1232
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1233
}
1234
return true;
1235
}
1236
1237
1027
/*
1238
1028
* This function determines if a directory entry in /sys/class/net
1239
1029
* corresponds to an acceptable network device.
1240
1030
* (This function is passed to scandir(3) as a filter function.)
1241
1031
*/
1242
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1243
1041
if(if_entry->d_name[0] == '.'){
1244
1042
return 0;
1245
1043
}
1246
1247
struct ifreq ifr;
1248
if(not get_flags(if_entry->d_name, &ifr)){
1249
if(debug){
1250
fprintf_plus(stderr, "Failed to get flags for interface "
1251
"\"%s\"\n", if_entry->d_name);
1252
}
1253
return 0;
1254
}
1255
1256
if(not good_flags(if_entry->d_name, &ifr)){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/*
1263
* This function determines if a network interface is up.
1264
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1277
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(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_RUNNING);
1292
}
1293
1294
int notdotentries(const struct dirent *direntry){
1295
/* Skip "." and ".." */
1296
if(direntry->d_name[0] == '.'
1297
and (direntry->d_name[1] == '\0'
1298
or (direntry->d_name[1] == '.'
1299
and direntry->d_name[2] == '\0'))){
1300
return 0;
1301
}
1302
return 1;
1303
}
1304
1305
/* Is this directory entry a runnable program? */
1306
int runnable_hook(const struct dirent *direntry){
1307
int ret;
1308
size_t sret;
1309
struct stat st;
1310
1311
if((direntry->d_name)[0] == '\0'){
1312
/* Empty name? */
1313
return 0;
1314
}
1315
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
"abcdefghijklmnopqrstuvwxyz"
1318
"0123456789"
1319
"_-");
1320
if((direntry->d_name)[sret] != '\0'){
1321
/* Contains non-allowed characters */
1322
if(debug){
1323
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1337
if(ret == -1){
1338
if(debug){
1339
perror_plus("Could not stat hook");
1340
}
1341
return 0;
1342
}
1343
if(not (S_ISREG(st.st_mode))){
1344
/* Not a regular file */
1345
if(debug){
1346
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1347
direntry->d_name);
1348
}
1349
return 0;
1350
}
1351
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1352
/* Not executable */
1353
if(debug){
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1355
direntry->d_name);
1356
}
1357
return 0;
1358
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1359
1115
if(debug){
1360
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1361
direntry->d_name);
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1362
1118
}
1363
1119
return 1;
1364
1120
}
1365
1121
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1368
int ret;
1369
struct timespec now;
1370
struct timespec waited_time;
1371
intmax_t block_time;
1372
1373
while(true){
1374
if(mc->current_server == NULL){
1375
if (debug){
1376
fprintf_plus(stderr, "Wait until first server is found."
1377
" No timeout!\n");
1378
}
1379
ret = avahi_simple_poll_iterate(s, -1);
1380
} else {
1381
if (debug){
1382
fprintf_plus(stderr, "Check current_server if we should run"
1383
" it, or wait\n");
1384
}
1385
/* the current time */
1386
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1387
if(ret == -1){
1388
perror_plus("clock_gettime");
1389
return -1;
1390
}
1391
/* Calculating in ms how long time between now and server
1392
who we visted longest time ago. Now - last seen. */
1393
waited_time.tv_sec = (now.tv_sec
1394
- mc->current_server->last_seen.tv_sec);
1395
waited_time.tv_nsec = (now.tv_nsec
1396
- mc->current_server->last_seen.tv_nsec);
1397
/* total time is 10s/10,000ms.
1398
Converting to s from ms by dividing by 1,000,
1399
and ns to ms by dividing by 1,000,000. */
1400
block_time = ((retry_interval
1401
- ((intmax_t)waited_time.tv_sec * 1000))
1402
- ((intmax_t)waited_time.tv_nsec / 1000000));
1403
1404
if (debug){
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1406
block_time);
1407
}
1408
1409
if(block_time <= 0){
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1414
if(ret == 0){
1415
avahi_simple_poll_quit(s);
1416
return 0;
1417
}
1418
ret = clock_gettime(CLOCK_MONOTONIC,
1419
&mc->current_server->last_seen);
1420
if(ret == -1){
1421
perror_plus("clock_gettime");
1422
return -1;
1423
}
1424
mc->current_server = mc->current_server->next;
1425
block_time = 0; /* Call avahi to find new Mandos
1426
servers, but don't block */
1427
}
1428
1429
ret = avahi_simple_poll_iterate(s, (int)block_time);
1430
}
1431
if(ret != 0){
1432
if (ret > 0 or errno != EINTR){
1433
return (ret != 1) ? ret : 0;
1434
}
1435
}
1436
}
1437
}
1438
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
1492
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1496
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
1514
perror_plus("asprintf");
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
free(delaystring);
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
1585
} else {
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
1622
}
1623
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
1661
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
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
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1792
}
1793
1794
1122
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1799
1123
AvahiSServiceBrowser *sb = NULL;
1800
error_t ret_errno;
1124
int error;
1801
1125
int ret;
1802
1126
intmax_t tmpmax;
1803
1127
char *tmp;
1804
1128
int exitcode = EXIT_SUCCESS;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1807
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1808
1136
bool tempdir_created = false;
1809
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
1138
const char *seckey = PATHDIR "/" SECKEY;
1811
1139
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1813
1140
1814
1141
bool gnutls_initialized = false;
1815
1142
bool gpgme_initialized = false;
1816
1143
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1819
1144
1820
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1821
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1827
1152
errno = 0;
1828
1153
ret = setgid(gid);
1829
1154
if(ret == -1){
1830
perror_plus("setgid");
1155
perror("setgid");
1831
1156
}
1832
1157
1833
1158
/* Lower user privileges (temporarily) */
1834
1159
errno = 0;
1835
1160
ret = seteuid(uid);
1836
1161
if(ret == -1){
1837
perror_plus("seteuid");
1162
perror("seteuid");
1838
1163
}
1839
1164
1840
1165
if(quit_now){
1875
1200
.arg = "SECONDS",
1876
1201
.doc = "Maximum delay to wait for interface startup",
1877
1202
.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
1203
/*
1887
1204
* These reproduce what we would get without ARGP_NO_HELP
1888
1205
*/
1906
1223
connect_to = arg;
1907
1224
break;
1908
1225
case 'i': /* --interface */
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
}
1226
interface = arg;
1914
1227
break;
1915
1228
case 's': /* --seckey */
1916
1229
seckey = arg;
1936
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1937
1250
argp_error(state, "Bad delay");
1938
1251
}
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
1252
break;
1951
1253
/*
1952
1254
* These reproduce what we would get without ARGP_NO_HELP
1959
1261
argp_state_help(state, state->out_stream,
1960
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
1263
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1963
1265
exit(argp_err_exit_status);
1964
1266
break;
1965
1267
default:
1980
1282
case ENOMEM:
1981
1283
default:
1982
1284
errno = ret;
1983
perror_plus("argp_parse");
1285
perror("argp_parse");
1984
1286
exitcode = EX_OSERR;
1985
1287
goto end;
1986
1288
case EINVAL:
1988
1290
goto end;
1989
1291
}
1990
1292
}
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
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2079
}
2080
1293
2081
1294
if(not debug){
2082
1295
avahi_set_log_function(empty_log);
2083
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
2084
1322
2085
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2086
1324
from the signal handler */
2087
1325
/* Initialize the pseudo-RNG for Avahi */
2088
1326
srand((unsigned int) time(NULL));
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
2091
fprintf_plus(stderr,
2092
"Avahi: Failed to create simple poll object.\n");
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2093
1330
exitcode = EX_UNAVAILABLE;
2094
1331
goto end;
2095
1332
}
2097
1334
sigemptyset(&sigterm_action.sa_mask);
2098
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2099
1336
if(ret == -1){
2100
perror_plus("sigaddset");
1337
perror("sigaddset");
2101
1338
exitcode = EX_OSERR;
2102
1339
goto end;
2103
1340
}
2104
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2105
1342
if(ret == -1){
2106
perror_plus("sigaddset");
1343
perror("sigaddset");
2107
1344
exitcode = EX_OSERR;
2108
1345
goto end;
2109
1346
}
2110
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2111
1348
if(ret == -1){
2112
perror_plus("sigaddset");
1349
perror("sigaddset");
2113
1350
exitcode = EX_OSERR;
2114
1351
goto end;
2115
1352
}
2119
1356
*/
2120
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2121
1358
if(ret == -1){
2122
perror_plus("sigaction");
1359
perror("sigaction");
2123
1360
return EX_OSERR;
2124
1361
}
2125
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
2126
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
2127
1364
if(ret == -1){
2128
perror_plus("sigaction");
1365
perror("sigaction");
2129
1366
exitcode = EX_OSERR;
2130
1367
goto end;
2131
1368
}
2132
1369
}
2133
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2134
1371
if(ret == -1){
2135
perror_plus("sigaction");
1372
perror("sigaction");
2136
1373
return EX_OSERR;
2137
1374
}
2138
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
2139
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2140
1377
if(ret == -1){
2141
perror_plus("sigaction");
1378
perror("sigaction");
2142
1379
exitcode = EX_OSERR;
2143
1380
goto end;
2144
1381
}
2145
1382
}
2146
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2147
1384
if(ret == -1){
2148
perror_plus("sigaction");
1385
perror("sigaction");
2149
1386
return EX_OSERR;
2150
1387
}
2151
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
2152
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2153
1390
if(ret == -1){
2154
perror_plus("sigaction");
1391
perror("sigaction");
2155
1392
exitcode = EX_OSERR;
2156
1393
goto end;
2157
1394
}
2158
1395
}
2159
1396
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
1482
}
1483
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
break;
1501
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
2182
1532
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
}
2208
}
2209
break;
2210
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
2240
1539
}
2241
1540
2242
1541
if(quit_now){
2243
1542
goto end;
2244
1543
}
2245
1544
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
1545
ret = init_gnutls_global(pubkey, seckey);
2247
1546
if(ret == -1){
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2249
1548
exitcode = EX_UNAVAILABLE;
2250
1549
goto end;
2251
1550
} else {
2256
1555
goto end;
2257
1556
}
2258
1557
1558
tempdir_created = true;
2259
1559
if(mkdtemp(tempdir) == NULL){
2260
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2261
1562
goto end;
2262
1563
}
2263
tempdir_created = true;
2264
1564
2265
1565
if(quit_now){
2266
1566
goto end;
2267
1567
}
2268
1568
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2270
fprintf_plus(stderr, "init_gpgme failed\n");
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2271
1571
exitcode = EX_UNAVAILABLE;
2272
1572
goto end;
2273
1573
} else {
2282
1582
/* Connect directly, do not use Zeroconf */
2283
1583
/* (Mainly meant for debugging) */
2284
1584
char *address = strrchr(connect_to, ':');
2285
2286
1585
if(address == NULL){
2287
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2288
1587
exitcode = EX_USAGE;
2289
1588
goto end;
2290
1589
}
2293
1592
goto end;
2294
1593
}
2295
1594
2296
in_port_t port;
1595
uint16_t port;
2297
1596
errno = 0;
2298
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2299
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2300
or tmpmax != (in_port_t)tmpmax){
2301
fprintf_plus(stderr, "Bad port number\n");
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2302
1601
exitcode = EX_USAGE;
2303
1602
goto end;
2304
1603
}
2305
1604
2306
1605
if(quit_now){
2307
1606
goto end;
2308
1607
}
2309
1608
2310
port = (in_port_t)tmpmax;
1609
port = (uint16_t)tmpmax;
2311
1610
*address = '\0';
1611
address = connect_to;
2312
1612
/* Colon in address indicates IPv6 */
2313
1613
int af;
2314
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2315
1615
af = AF_INET6;
2316
/* Accept [] around IPv6 address - see RFC 5952 */
2317
if(connect_to[0] == '[' and address[-1] == ']')
2318
{
2319
connect_to++;
2320
address[-1] = '\0';
2321
}
2322
1616
} else {
2323
1617
af = AF_INET;
2324
1618
}
2325
address = connect_to;
2326
1619
2327
1620
if(quit_now){
2328
1621
goto end;
2329
1622
}
2330
1623
2331
1624
while(not quit_now){
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
1625
ret = start_mandos_communication(address, port, if_index, af);
2334
1626
if(quit_now or ret == 0){
2335
1627
break;
2336
1628
}
2337
if(debug){
2338
fprintf_plus(stderr, "Retrying in %d seconds\n",
2339
(int)retry_interval);
2340
}
2341
sleep((unsigned int)retry_interval);
2342
}
2343
1629
sleep(15);
1630
};
1631
2344
1632
if (not quit_now){
2345
1633
exitcode = EXIT_SUCCESS;
2346
1634
}
2347
1635
2348
1636
goto end;
2349
1637
}
2350
1638
2362
1650
config.publish_domain = 0;
2363
1651
2364
1652
/* Allocate a new server */
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2367
1656
2368
1657
/* Free the Avahi configuration data */
2369
1658
avahi_server_config_free(&config);
2371
1660
2372
1661
/* Check if creating the Avahi server object succeeded */
2373
1662
if(mc.server == NULL){
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2376
1665
exitcode = EX_UNAVAILABLE;
2377
1666
goto end;
2378
1667
}
2384
1673
/* Create the Avahi service browser */
2385
1674
sb = avahi_s_service_browser_new(mc.server, if_index,
2386
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
1676
NULL, 0, browse_callback, NULL);
2389
1677
if(sb == NULL){
2390
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
avahi_strerror(avahi_server_errno(mc.server)));
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2392
1680
exitcode = EX_UNAVAILABLE;
2393
1681
goto end;
2394
1682
}
2400
1688
/* Run the main loop */
2401
1689
2402
1690
if(debug){
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2404
}
2405
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
2408
if(debug){
2409
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2410
(ret == 0) ? "successfully" : "with error");
2411
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2412
1695
2413
1696
end:
2414
1697
2415
1698
if(debug){
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2417
1700
}
2418
1701
2419
1702
/* Cleanup things */
2420
free(mc.interfaces);
2421
2422
1703
if(sb != NULL)
2423
1704
avahi_s_service_browser_free(sb);
2424
1705
2425
1706
if(mc.server != NULL)
2426
1707
avahi_server_free(mc.server);
2427
1708
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2430
1711
2431
1712
if(gnutls_initialized){
2432
1713
gnutls_certificate_free_credentials(mc.cred);
2438
1719
gpgme_release(mc.ctx);
2439
1720
}
2440
1721
2441
/* Cleans up the circular linked list of Mandos servers the client
2442
has seen */
2443
if(mc.current_server != NULL){
2444
mc.current_server->prev->next = NULL;
2445
while(mc.current_server != NULL){
2446
server *next = mc.current_server->next;
2447
free(mc.current_server);
2448
mc.current_server = next;
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
2449
1729
}
2450
}
2451
2452
/* Re-raise priviliges */
2453
{
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2470
1739
}
2471
1740
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2475
1750
}
2476
1751
}
2477
2478
lower_privileges_permanently();
2479
1752
}
2480
1753
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2483
2484
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2485
1755
if(tempdir_created){
2486
struct dirent **direntries = NULL;
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
alphasort);
2490
if (numentries > 0){
2491
for(int i = 0; i < numentries; i++){
2492
direntry = direntries[i];
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2493
1776
char *fullname = NULL;
2494
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2495
1778
direntry->d_name);
2496
1779
if(ret < 0){
2497
perror_plus("asprintf");
1780
perror("asprintf");
2498
1781
continue;
2499
1782
}
2500
1783
ret = remove(fullname);
2501
1784
if(ret == -1){
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2504
1787
}
2505
1788
free(fullname);
2506
1789
}
2507
}
2508
2509
/* need to clean even if 0 because man page doesn't specify */
2510
free(direntries);
2511
if (numentries == -1){
2512
perror_plus("scandir");
1790
closedir(d);
2513
1791
}
2514
1792
ret = rmdir(tempdir);
2515
1793
if(ret == -1 and errno != ENOENT){
2516
perror_plus("rmdir");
1794
perror("rmdir");
2517
1795
}
2518
1796
}
2519
1797
2524
1802
&old_sigterm_action,
2525
1803
NULL));
2526
1804
if(ret == -1){
2527
perror_plus("sigaction");
1805
perror("sigaction");
2528
1806
}
2529
1807
do {
2530
1808
ret = raise(signal_received);
2531
1809
} while(ret != 0 and errno == EINTR);
2532
1810
if(ret != 0){
2533
perror_plus("raise");
1811
perror("raise");
2534
1812
abort();
2535
1813
}
2536
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0