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- Committer: Teddy Hogeborn
- Date: 2009-09-17 01:21:27 UTC
- Revision ID: teddy@fukt.bsnet.se-20090917012127-4kwzquwuvudwucuv
* debian/control (Standards-Version): Updated to "2.8.3".
* mandos-client.conf.xml (OPTIONS/timeout): Add that a successful
client request will also
reset the timeout.
* mandos.xml (CHECKING): - '' -
* mandos-client.conf.xml (OPTIONS/timeout): Add that a successful
client request will also
reset the timeout.
* mandos.xml (CHECKING): - '' -
- files removed:
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
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(), 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 */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
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() */
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,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
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
85
98
86
#ifdef __linux__
99
87
#include <sys/klog.h> /* klogctl() */
117
105
init_gnutls_session(),
118
106
GNUTLS_* */
119
107
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
122
110
123
111
/* GPGME */
124
112
#include <gpgme.h> /* All GPGME types, constants and
132
120
#define PATHDIR "/conf/conf.d/mandos"
133
121
#define SECKEY "seckey.txt"
134
122
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
123
137
124
bool debug = false;
138
125
static const char mandos_protocol_version[] = "1";
139
126
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
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;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
157
128
158
129
/* Used for passing in values through the Avahi callback functions */
159
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
160
132
AvahiServer *server;
161
133
gnutls_certificate_credentials_t cred;
162
134
unsigned int dh_bits;
163
135
gnutls_dh_params_t dh_params;
164
136
const char *priority;
165
137
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
138
} mandos_context;
170
139
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
173
174
sig_atomic_t quit_now = 0;
175
int signal_received = 0;
176
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
}
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" };
195
144
196
145
/*
197
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
148
* "buffer_length" is how much is already used.
200
149
*/
201
150
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
151
size_t buffer_capacity){
203
152
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;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
210
155
return 0;
211
156
}
212
*buffer = new_buf;
213
157
buffer_capacity += BUFFER_SIZE;
214
158
}
215
159
return buffer_capacity;
216
160
}
217
161
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
/* Special case of first server */
236
if(*current_server == NULL){
237
new_server->next = new_server;
238
new_server->prev = new_server;
239
*current_server = new_server;
240
/* Place the new server last in the list */
241
} else {
242
new_server->next = *current_server;
243
new_server->prev = (*current_server)->prev;
244
new_server->prev->next = new_server;
245
(*current_server)->prev = new_server;
246
}
247
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
248
if(ret == -1){
249
perror_plus("clock_gettime");
250
return false;
251
}
252
return true;
253
}
254
255
162
/*
256
163
* Initialize GPGME.
257
164
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
260
167
gpgme_error_t rc;
261
168
gpgme_engine_info_t engine_info;
262
169
170
263
171
/*
264
172
* Helper function to insert pub and seckey to the engine keyring.
265
173
*/
270
178
271
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
272
180
if(fd == -1){
273
perror_plus("open");
181
perror("open");
274
182
return false;
275
183
}
276
184
277
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
278
186
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));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
281
189
return false;
282
190
}
283
191
284
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
285
193
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
288
196
return false;
289
197
}
290
198
291
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
292
200
if(ret == -1){
293
perror_plus("close");
201
perror("close");
294
202
}
295
203
gpgme_data_release(pgp_data);
296
204
return true;
297
205
}
298
206
299
207
if(debug){
300
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
301
209
}
302
210
303
211
/* Init GPGME */
304
212
gpgme_check_version(NULL);
305
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
306
214
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));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
309
217
return false;
310
218
}
311
219
312
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
313
221
rc = gpgme_get_engine_info(&engine_info);
314
222
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));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
317
225
return false;
318
226
}
319
227
while(engine_info != NULL){
325
233
engine_info = engine_info->next;
326
234
}
327
235
if(engine_info == NULL){
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
330
237
return false;
331
238
}
332
239
333
240
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
335
242
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));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
339
245
return false;
340
246
}
341
247
352
258
*/
353
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
260
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
261
char **plaintext){
357
262
gpgme_data_t dh_crypto, dh_plain;
358
263
gpgme_error_t rc;
359
264
ssize_t ret;
361
266
ssize_t plaintext_length = 0;
362
267
363
268
if(debug){
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
365
270
}
366
271
367
272
/* Create new GPGME data buffer from memory cryptotext */
368
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
369
274
0);
370
275
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));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
373
278
return -1;
374
279
}
375
280
376
281
/* Create new empty GPGME data buffer for the plaintext */
377
282
rc = gpgme_data_new(&dh_plain);
378
283
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));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
382
286
gpgme_data_release(dh_crypto);
383
287
return -1;
384
288
}
385
289
386
290
/* Decrypt data from the cryptotext data buffer to the plaintext
387
291
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
293
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
392
296
plaintext_length = -1;
393
297
if(debug){
394
298
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
396
300
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
398
302
} 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);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
403
307
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
405
309
}
406
310
gpgme_recipient_t recipient;
407
311
recipient = result->recipients;
408
312
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");
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");
416
319
recipient = recipient->next;
417
320
}
418
321
}
421
324
}
422
325
423
326
if(debug){
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
425
328
}
426
329
427
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
428
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
429
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
430
333
plaintext_length = -1;
431
334
goto decrypt_end;
432
335
}
434
337
*plaintext = NULL;
435
338
while(true){
436
339
plaintext_capacity = incbuffer(plaintext,
437
(size_t)plaintext_length,
438
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
439
342
if(plaintext_capacity == 0){
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
443
346
}
444
347
445
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
353
break;
451
354
}
452
355
if(ret < 0){
453
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
454
357
plaintext_length = -1;
455
358
goto decrypt_end;
456
359
}
458
361
}
459
362
460
363
if(debug){
461
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
462
365
for(ssize_t i = 0; i < plaintext_length; i++){
463
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
367
}
476
379
}
477
380
478
381
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
480
384
if(ret == NULL)
481
385
ret = "(unknown)";
482
386
return ret;
485
389
/* GnuTLS log function callback */
486
390
static void debuggnutls(__attribute__((unused)) int level,
487
391
const char* string){
488
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
489
393
}
490
394
491
395
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
396
const char *seckeyfilename){
494
397
int ret;
495
398
496
399
if(debug){
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
498
401
}
499
402
500
403
ret = gnutls_global_init();
501
404
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
504
407
return -1;
505
408
}
506
409
513
416
}
514
417
515
418
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
517
420
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
520
426
gnutls_global_deinit();
521
427
return -1;
522
428
}
523
429
524
430
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);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
529
434
}
530
435
531
436
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
533
438
GNUTLS_OPENPGP_FMT_BASE64);
534
439
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));
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));
540
445
goto globalfail;
541
446
}
542
447
543
448
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
545
450
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
549
453
goto globalfail;
550
454
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
456
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
555
459
goto globalfail;
556
460
}
557
461
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
463
560
464
return 0;
561
465
562
466
globalfail:
563
467
564
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
565
469
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
567
471
return -1;
568
472
}
569
473
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
474
static int init_gnutls_session(gnutls_session_t *session){
572
475
int ret;
573
476
/* GnuTLS session creation */
574
477
do {
575
478
ret = gnutls_init(session, GNUTLS_SERVER);
576
if(quit_now){
577
return -1;
578
}
579
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
480
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
584
483
}
585
484
586
485
{
587
486
const char *err;
588
487
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
590
if(quit_now){
591
gnutls_deinit(*session);
592
return -1;
593
}
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
594
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
595
490
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));
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
599
494
gnutls_deinit(*session);
600
495
return -1;
601
496
}
603
498
604
499
do {
605
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
607
if(quit_now){
608
gnutls_deinit(*session);
609
return -1;
610
}
501
mc.cred);
611
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
612
503
if(ret != GNUTLS_E_SUCCESS){
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
615
506
gnutls_deinit(*session);
616
507
return -1;
617
508
}
619
510
/* ignore client certificate if any. */
620
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
512
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
514
624
515
return 0;
625
516
}
628
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
629
520
__attribute__((unused)) const char *txt){}
630
521
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
631
525
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
526
static int start_mandos_communication(const char *ip, uint16_t port,
633
527
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
528
int af){
635
529
int ret, tcp_sd = -1;
636
530
ssize_t sret;
637
531
union {
639
533
struct sockaddr_in6 in6;
640
534
} to;
641
535
char *buffer = NULL;
642
char *decrypted_buffer = NULL;
536
char *decrypted_buffer;
643
537
size_t buffer_length = 0;
644
538
size_t buffer_capacity = 0;
645
539
size_t written;
646
int retval = -1;
540
int retval = 0;
647
541
gnutls_session_t session;
648
542
int pf; /* Protocol family */
649
543
650
errno = 0;
651
652
544
if(quit_now){
653
errno = EINTR;
654
545
return -1;
655
546
}
656
547
662
553
pf = PF_INET;
663
554
break;
664
555
default:
665
fprintf_plus(stderr, "Bad address family: %d\n", af);
666
errno = EINVAL;
556
fprintf(stderr, "Bad address family: %d\n", af);
667
557
return -1;
668
558
}
669
559
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
673
bool match = false;
674
{
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
678
if(if_nametoindex(interface) == (unsigned int)if_index){
679
match = true;
680
break;
681
}
682
}
683
}
684
if(not match){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
687
if(debug){
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
691
} else {
692
fprintf_plus(stderr, "Skipping server on non-used interface"
693
" \"%s\"\n",
694
if_indextoname((unsigned int)if_index,
695
interface));
696
}
697
}
698
return -1;
699
}
700
}
701
702
ret = init_gnutls_session(&session, mc);
560
ret = init_gnutls_session(&session);
703
561
if(ret != 0){
704
562
return -1;
705
563
}
706
564
707
565
if(debug){
708
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
710
568
}
711
569
712
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
713
571
if(tcp_sd < 0){
714
int e = errno;
715
perror_plus("socket");
716
errno = e;
572
perror("socket");
573
retval = -1;
717
574
goto mandos_end;
718
575
}
719
576
720
577
if(quit_now){
721
errno = EINTR;
722
578
goto mandos_end;
723
579
}
724
580
731
587
ret = inet_pton(af, ip, &to.in.sin_addr);
732
588
}
733
589
if(ret < 0 ){
734
int e = errno;
735
perror_plus("inet_pton");
736
errno = e;
590
perror("inet_pton");
591
retval = -1;
737
592
goto mandos_end;
738
593
}
739
594
if(ret == 0){
740
int e = errno;
741
fprintf_plus(stderr, "Bad address: %s\n", ip);
742
errno = e;
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
743
597
goto mandos_end;
744
598
}
745
599
if(af == AF_INET6){
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
751
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
756
607
if(if_index == AVAHI_IF_UNSPEC){
757
fprintf_plus(stderr, "An IPv6 link-local address is"
758
" incomplete without a network interface\n");
759
errno = EINVAL;
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
760
611
goto mandos_end;
761
612
}
762
613
/* Set the network interface number as scope */
763
614
to.in6.sin6_scope_id = (uint32_t)if_index;
764
615
}
765
616
} else {
766
to.in.sin_port = htons(port);
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
767
620
}
768
621
769
622
if(quit_now){
770
errno = EINTR;
771
623
goto mandos_end;
772
624
}
773
625
775
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
776
628
char interface[IF_NAMESIZE];
777
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
778
perror_plus("if_indextoname");
630
perror("if_indextoname");
779
631
} else {
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
782
634
}
783
635
} else {
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
786
638
}
787
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
788
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
789
642
if(af == AF_INET6){
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
793
645
} else {
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
797
648
}
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
649
if(pcret == NULL){
650
perror("inet_ntop");
651
} else {
652
if(strcmp(addrstr, ip) != 0){
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
654
}
804
655
}
805
656
}
806
657
807
658
if(quit_now){
808
errno = EINTR;
809
659
goto mandos_end;
810
660
}
811
661
815
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
816
666
}
817
667
if(ret < 0){
818
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
819
int e = errno;
820
perror_plus("connect");
821
errno = e;
822
}
668
perror("connect");
669
retval = -1;
823
670
goto mandos_end;
824
671
}
825
672
826
673
if(quit_now){
827
errno = EINTR;
828
674
goto mandos_end;
829
675
}
830
676
833
679
while(true){
834
680
size_t out_size = strlen(out);
835
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
836
out_size - written));
682
out_size - written));
837
683
if(ret == -1){
838
int e = errno;
839
perror_plus("write");
840
errno = e;
684
perror("write");
685
retval = -1;
841
686
goto mandos_end;
842
687
}
843
688
written += (size_t)ret;
853
698
}
854
699
855
700
if(quit_now){
856
errno = EINTR;
857
701
goto mandos_end;
858
702
}
859
703
}
860
704
861
705
if(debug){
862
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
863
707
}
864
708
865
709
if(quit_now){
866
errno = EINTR;
867
710
goto mandos_end;
868
711
}
869
712
870
/* This casting via intptr_t is to eliminate warning about casting
871
an int to a pointer type. This is exactly how the GnuTLS Guile
872
function "set-session-transport-fd!" does it. */
873
gnutls_transport_set_ptr(session,
874
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
714
876
715
if(quit_now){
877
errno = EINTR;
878
716
goto mandos_end;
879
717
}
880
718
881
719
do {
882
720
ret = gnutls_handshake(session);
883
721
if(quit_now){
884
errno = EINTR;
885
722
goto mandos_end;
886
723
}
887
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
888
725
889
726
if(ret != GNUTLS_E_SUCCESS){
890
727
if(debug){
891
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
892
729
gnutls_perror(ret);
893
730
}
894
errno = EPROTO;
731
retval = -1;
895
732
goto mandos_end;
896
733
}
897
734
898
735
/* Read OpenPGP packet that contains the wanted password */
899
736
900
737
if(debug){
901
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
902
" %s\n", ip);
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
903
740
}
904
741
905
742
while(true){
906
743
907
744
if(quit_now){
908
errno = EINTR;
909
745
goto mandos_end;
910
746
}
911
747
912
748
buffer_capacity = incbuffer(&buffer, buffer_length,
913
buffer_capacity);
749
buffer_capacity);
914
750
if(buffer_capacity == 0){
915
int e = errno;
916
perror_plus("incbuffer");
917
errno = e;
751
perror("incbuffer");
752
retval = -1;
918
753
goto mandos_end;
919
754
}
920
755
921
756
if(quit_now){
922
errno = EINTR;
923
757
goto mandos_end;
924
758
}
925
759
938
772
ret = gnutls_handshake(session);
939
773
940
774
if(quit_now){
941
errno = EINTR;
942
775
goto mandos_end;
943
776
}
944
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
945
778
if(ret < 0){
946
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
947
"***\n");
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
948
780
gnutls_perror(ret);
949
errno = EPROTO;
781
retval = -1;
950
782
goto mandos_end;
951
783
}
952
784
break;
953
785
default:
954
fprintf_plus(stderr, "Unknown error while reading data from"
955
" encrypted session with Mandos server\n");
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
956
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
957
errno = EIO;
958
790
goto mandos_end;
959
791
}
960
792
} else {
963
795
}
964
796
965
797
if(debug){
966
fprintf_plus(stderr, "Closing TLS session\n");
967
}
968
969
if(quit_now){
970
errno = EINTR;
971
goto mandos_end;
972
}
973
974
do {
975
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
976
if(quit_now){
977
errno = EINTR;
978
goto mandos_end;
979
}
980
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
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
}
981
810
982
811
if(buffer_length > 0){
983
812
ssize_t decrypted_buffer_size;
984
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
815
&decrypted_buffer);
986
816
if(decrypted_buffer_size >= 0){
987
817
988
818
written = 0;
989
819
while(written < (size_t) decrypted_buffer_size){
990
820
if(quit_now){
991
errno = EINTR;
992
821
goto mandos_end;
993
822
}
994
823
996
825
(size_t)decrypted_buffer_size - written,
997
826
stdout);
998
827
if(ret == 0 and ferror(stdout)){
999
int e = errno;
1000
828
if(debug){
1001
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1002
strerror(errno));
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
1003
831
}
1004
errno = e;
1005
goto mandos_end;
832
retval = -1;
833
break;
1006
834
}
1007
835
written += (size_t)ret;
1008
836
}
1009
retval = 0;
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
1010
840
}
841
} else {
842
retval = -1;
1011
843
}
1012
844
1013
845
/* Shutdown procedure */
1014
846
1015
847
mandos_end:
1016
{
1017
int e = errno;
1018
free(decrypted_buffer);
1019
free(buffer);
1020
if(tcp_sd >= 0){
1021
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1022
}
1023
if(ret == -1){
1024
if(e == 0){
1025
e = errno;
1026
}
1027
perror_plus("close");
1028
}
1029
gnutls_deinit(session);
1030
errno = e;
1031
if(quit_now){
1032
errno = EINTR;
1033
retval = -1;
1034
}
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;
1035
858
}
1036
859
return retval;
1037
860
}
1049
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
1050
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1051
874
flags,
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1056
877
1057
878
/* Called whenever a service has been resolved successfully or
1058
879
timed out */
1064
885
switch(event){
1065
886
default:
1066
887
case AVAHI_RESOLVER_FAILURE:
1067
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1068
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1069
domain,
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
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)));
1072
891
break;
1073
892
1074
893
case AVAHI_RESOLVER_FOUND:
1076
895
char ip[AVAHI_ADDRESS_STR_MAX];
1077
896
avahi_address_snprint(ip, sizeof(ip), address);
1078
897
if(debug){
1079
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1080
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
host_name, ip, (intmax_t)interface, port);
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);
1082
901
}
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1087
904
if(ret == 0){
1088
avahi_simple_poll_quit(simple_poll);
1089
} else {
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1093
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1094
" list\n", name);
1095
}
905
avahi_simple_poll_quit(mc.simple_poll);
1096
906
}
1097
907
}
1098
908
}
1108
918
const char *domain,
1109
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1110
920
flags,
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1115
923
1116
924
/* Called whenever a new services becomes available on the LAN or
1117
925
is removed from the LAN */
1124
932
default:
1125
933
case AVAHI_BROWSER_FAILURE:
1126
934
1127
fprintf_plus(stderr, "(Avahi browser) %s\n",
1128
avahi_strerror(avahi_server_errno
1129
(((mandos_context*)mc)->server)));
1130
avahi_simple_poll_quit(simple_poll);
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1131
938
return;
1132
939
1133
940
case AVAHI_BROWSER_NEW:
1136
943
the callback function is called the Avahi server will free the
1137
944
resolver for us. */
1138
945
1139
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1140
interface, protocol, name, type,
1141
domain, protocol, 0,
1142
resolve_callback, mc) == NULL)
1143
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1144
" %s\n", name,
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
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)));
1147
951
break;
1148
952
1149
953
case AVAHI_BROWSER_REMOVE:
1152
956
case AVAHI_BROWSER_ALL_FOR_NOW:
1153
957
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1154
958
if(debug){
1155
fprintf_plus(stderr, "No Mandos server found, still"
1156
" searching...\n");
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1157
960
}
1158
961
break;
1159
962
}
1160
963
}
1161
964
1162
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1163
966
static void handle_sigterm(int sig){
1164
967
if(quit_now){
1165
968
return;
1167
970
quit_now = 1;
1168
971
signal_received = sig;
1169
972
int old_errno = errno;
1170
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1173
}
1174
errno = old_errno;
1175
}
1176
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1178
int ret;
1179
error_t ret_errno;
1180
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1182
if(s < 0){
1183
ret_errno = errno;
1184
perror_plus("socket");
1185
errno = ret_errno;
1186
return false;
1187
}
1188
strcpy(ifr->ifr_name, ifname);
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1190
if(ret == -1){
1191
if(debug){
1192
ret_errno = errno;
1193
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1195
}
1196
return false;
1197
}
1198
return true;
1199
}
1200
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1202
1203
/* Reject the loopback device */
1204
if(ifr->ifr_flags & IFF_LOOPBACK){
1205
if(debug){
1206
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1207
ifname);
1208
}
1209
return false;
1210
}
1211
/* Accept point-to-point devices only if connect_to is specified */
1212
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1213
if(debug){
1214
fprintf_plus(stderr, "Accepting point-to-point interface"
1215
" \"%s\"\n", ifname);
1216
}
1217
return true;
1218
}
1219
/* Otherwise, reject non-broadcast-capable devices */
1220
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return false;
1226
}
1227
/* Reject non-ARP interfaces (including dummy interfaces) */
1228
if(ifr->ifr_flags & IFF_NOARP){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1231
ifname);
1232
}
1233
return false;
1234
}
1235
1236
/* Accept this device */
1237
if(debug){
1238
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1239
}
1240
return true;
1241
}
1242
1243
/*
1244
* This function determines if a directory entry in /sys/class/net
1245
* corresponds to an acceptable network device.
1246
* (This function is passed to scandir(3) as a filter function.)
1247
*/
1248
int good_interface(const struct dirent *if_entry){
1249
if(if_entry->d_name[0] == '.'){
1250
return 0;
1251
}
1252
1253
struct ifreq ifr;
1254
if(not get_flags(if_entry->d_name, &ifr)){
1255
if(debug){
1256
fprintf_plus(stderr, "Failed to get flags for interface "
1257
"\"%s\"\n", if_entry->d_name);
1258
}
1259
return 0;
1260
}
1261
1262
if(not good_flags(if_entry->d_name, &ifr)){
1263
return 0;
1264
}
1265
return 1;
1266
}
1267
1268
/*
1269
* This function determines if a network interface is up.
1270
*/
1271
bool interface_is_up(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1282
}
1283
1284
/*
1285
* This function determines if a network interface is running
1286
*/
1287
bool interface_is_running(const char *interface){
1288
struct ifreq ifr;
1289
if(not get_flags(interface, &ifr)){
1290
if(debug){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1293
}
1294
return false;
1295
}
1296
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1298
}
1299
1300
int notdotentries(const struct dirent *direntry){
1301
/* Skip "." and ".." */
1302
if(direntry->d_name[0] == '.'
1303
and (direntry->d_name[1] == '\0'
1304
or (direntry->d_name[1] == '.'
1305
and direntry->d_name[2] == '\0'))){
1306
return 0;
1307
}
1308
return 1;
1309
}
1310
1311
/* Is this directory entry a runnable program? */
1312
int runnable_hook(const struct dirent *direntry){
1313
int ret;
1314
size_t sret;
1315
struct stat st;
1316
1317
if((direntry->d_name)[0] == '\0'){
1318
/* Empty name? */
1319
return 0;
1320
}
1321
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1323
"abcdefghijklmnopqrstuvwxyz"
1324
"0123456789"
1325
"_-");
1326
if((direntry->d_name)[sret] != '\0'){
1327
/* Contains non-allowed characters */
1328
if(debug){
1329
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1330
direntry->d_name);
1331
}
1332
return 0;
1333
}
1334
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1337
if(ret < 0){
1338
perror_plus("asprintf");
1339
return 0;
1340
}
1341
1342
ret = stat(fullname, &st);
1343
if(ret == -1){
1344
if(debug){
1345
perror_plus("Could not stat hook");
1346
}
1347
return 0;
1348
}
1349
if(not (S_ISREG(st.st_mode))){
1350
/* Not a regular file */
1351
if(debug){
1352
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1353
direntry->d_name);
1354
}
1355
return 0;
1356
}
1357
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1358
/* Not executable */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(debug){
1366
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1367
direntry->d_name);
1368
}
1369
return 1;
1370
}
1371
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1374
int ret;
1375
struct timespec now;
1376
struct timespec waited_time;
1377
intmax_t block_time;
1378
1379
while(true){
1380
if(mc->current_server == NULL){
1381
if (debug){
1382
fprintf_plus(stderr, "Wait until first server is found."
1383
" No timeout!\n");
1384
}
1385
ret = avahi_simple_poll_iterate(s, -1);
1386
} else {
1387
if (debug){
1388
fprintf_plus(stderr, "Check current_server if we should run"
1389
" it, or wait\n");
1390
}
1391
/* the current time */
1392
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1393
if(ret == -1){
1394
perror_plus("clock_gettime");
1395
return -1;
1396
}
1397
/* Calculating in ms how long time between now and server
1398
who we visted longest time ago. Now - last seen. */
1399
waited_time.tv_sec = (now.tv_sec
1400
- mc->current_server->last_seen.tv_sec);
1401
waited_time.tv_nsec = (now.tv_nsec
1402
- mc->current_server->last_seen.tv_nsec);
1403
/* total time is 10s/10,000ms.
1404
Converting to s from ms by dividing by 1,000,
1405
and ns to ms by dividing by 1,000,000. */
1406
block_time = ((retry_interval
1407
- ((intmax_t)waited_time.tv_sec * 1000))
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
1409
1410
if (debug){
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1412
block_time);
1413
}
1414
1415
if(block_time <= 0){
1416
ret = start_mandos_communication(mc->current_server->ip,
1417
mc->current_server->port,
1418
mc->current_server->if_index,
1419
mc->current_server->af, mc);
1420
if(ret == 0){
1421
avahi_simple_poll_quit(s);
1422
return 0;
1423
}
1424
ret = clock_gettime(CLOCK_MONOTONIC,
1425
&mc->current_server->last_seen);
1426
if(ret == -1){
1427
perror_plus("clock_gettime");
1428
return -1;
1429
}
1430
mc->current_server = mc->current_server->next;
1431
block_time = 0; /* Call avahi to find new Mandos
1432
servers, but don't block */
1433
}
1434
1435
ret = avahi_simple_poll_iterate(s, (int)block_time);
1436
}
1437
if(ret != 0){
1438
if (ret > 0 or errno != EINTR){
1439
return (ret != 1) ? ret : 0;
1440
}
1441
}
1442
}
1443
}
1444
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
bool run_network_hooks(const char *mode, const char *interface,
1498
const float delay){
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
alphasort);
1502
if(numhooks == -1){
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1510
}
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
if(ret < 0){
1520
perror_plus("asprintf");
1521
continue;
1522
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
pid_t hook_pid = fork();
1528
if(hook_pid == 0){
1529
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
dup2(devnull, STDIN_FILENO);
1545
close(devnull);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
if(ret == -1){
1549
perror_plus("setenv");
1550
_exit(EX_OSERR);
1551
}
1552
ret = setenv("DEVICE", interface, 1);
1553
if(ret == -1){
1554
perror_plus("setenv");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1558
if(ret == -1){
1559
perror_plus("setenv");
1560
_exit(EX_OSERR);
1561
}
1562
ret = setenv("MODE", mode, 1);
1563
if(ret == -1){
1564
perror_plus("setenv");
1565
_exit(EX_OSERR);
1566
}
1567
char *delaystring;
1568
ret = asprintf(&delaystring, "%f", delay);
1569
if(ret == -1){
1570
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1572
}
1573
ret = setenv("DELAY", delaystring, 1);
1574
if(ret == -1){
1575
free(delaystring);
1576
perror_plus("setenv");
1577
_exit(EX_OSERR);
1578
}
1579
free(delaystring);
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
1591
} else {
1592
int status;
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1595
free(fullname);
1596
continue;
1597
}
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1603
free(fullname);
1604
continue;
1605
}
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1609
WTERMSIG(status));
1610
free(fullname);
1611
continue;
1612
} else {
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1615
free(fullname);
1616
continue;
1617
}
1618
}
1619
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1623
}
1624
}
1625
close(devnull);
1626
}
1627
return true;
1628
}
1629
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1638
if(if_index == 0){
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1640
errno = old_errno;
1641
return ENXIO;
1642
}
1643
1644
if(quit_now){
1645
errno = old_errno;
1646
return EINTR;
1647
}
1648
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1651
ret_errno = errno;
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1654
return ret_errno;
1655
}
1656
network.ifr_flags |= IFF_UP;
1657
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
1660
ret_errno = errno;
1661
perror_plus("socket");
1662
errno = old_errno;
1663
return ret_errno;
1664
}
1665
1666
if(quit_now){
1667
close(sd);
1668
errno = old_errno;
1669
return EINTR;
1670
}
1671
1672
if(debug){
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1674
interface);
1675
}
1676
1677
/* Raise priviliges */
1678
raise_privileges();
1679
1680
#ifdef __linux__
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1688
}
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
1692
#ifdef __linux__
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
1697
}
1698
}
1699
#endif /* __linux__ */
1700
1701
/* Lower privileges */
1702
lower_privileges();
1703
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1706
if(ret == -1){
1707
perror_plus("close");
1708
}
1709
1710
if(ret_setflags == -1){
1711
errno = ret_errno;
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
} else if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1718
interface);
1719
}
1720
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1725
break;
1726
}
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1731
}
1732
}
1733
1734
errno = old_errno;
1735
return 0;
1736
}
1737
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1742
if(if_index == 0){
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1744
errno = old_errno;
1745
return ENXIO;
1746
}
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1750
ret_errno = errno;
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1753
return ret_errno;
1754
}
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1756
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1758
if(sd < 0){
1759
ret_errno = errno;
1760
perror_plus("socket");
1761
errno = old_errno;
1762
return ret_errno;
1763
}
1764
1765
if(debug){
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1767
interface);
1768
}
1769
1770
/* Raise priviliges */
1771
raise_privileges();
1772
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1774
ret_errno = errno;
1775
1776
/* Lower privileges */
1777
lower_privileges();
1778
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1781
if(ret == -1){
1782
perror_plus("close");
1783
}
1784
1785
if(ret_setflags == -1){
1786
errno = ret_errno;
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
errno = old_errno;
1789
return ret_errno;
1790
}
1791
} else if(debug){
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1793
interface);
1794
}
1795
1796
errno = old_errno;
1797
return 0;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
1798
977
}
1799
978
1800
979
int main(int argc, char *argv[]){
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1805
980
AvahiSServiceBrowser *sb = NULL;
1806
error_t ret_errno;
981
int error;
1807
982
int ret;
1808
983
intmax_t tmpmax;
1809
984
char *tmp;
1810
985
int exitcode = EXIT_SUCCESS;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
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;
1813
993
char tempdir[] = "/tmp/mandosXXXXXX";
1814
994
bool tempdir_created = false;
1815
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1816
996
const char *seckey = PATHDIR "/" SECKEY;
1817
997
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1819
998
1820
999
bool gnutls_initialized = false;
1821
1000
bool gpgme_initialized = false;
1822
1001
float delay = 2.5f;
1823
double retry_interval = 10; /* 10s between trying a server and
1824
retrying the same server again */
1825
1002
1826
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1827
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1833
1010
errno = 0;
1834
1011
ret = setgid(gid);
1835
1012
if(ret == -1){
1836
perror_plus("setgid");
1013
perror("setgid");
1837
1014
}
1838
1015
1839
1016
/* Lower user privileges (temporarily) */
1840
1017
errno = 0;
1841
1018
ret = seteuid(uid);
1842
1019
if(ret == -1){
1843
perror_plus("seteuid");
1020
perror("seteuid");
1844
1021
}
1845
1022
1846
1023
if(quit_now){
1881
1058
.arg = "SECONDS",
1882
1059
.doc = "Maximum delay to wait for interface startup",
1883
1060
.group = 2 },
1884
{ .name = "retry", .key = 132,
1885
.arg = "SECONDS",
1886
.doc = "Retry interval used when denied by the Mandos server",
1887
.group = 2 },
1888
{ .name = "network-hook-dir", .key = 133,
1889
.arg = "DIR",
1890
.doc = "Directory where network hooks are located",
1891
.group = 2 },
1892
/*
1893
* These reproduce what we would get without ARGP_NO_HELP
1894
*/
1895
{ .name = "help", .key = '?',
1896
.doc = "Give this help list", .group = -1 },
1897
{ .name = "usage", .key = -3,
1898
.doc = "Give a short usage message", .group = -1 },
1899
{ .name = "version", .key = 'V',
1900
.doc = "Print program version", .group = -1 },
1901
1061
{ .name = NULL }
1902
1062
};
1903
1063
1904
1064
error_t parse_opt(int key, char *arg,
1905
1065
struct argp_state *state){
1906
errno = 0;
1907
1066
switch(key){
1908
1067
case 128: /* --debug */
1909
1068
debug = true;
1912
1071
connect_to = arg;
1913
1072
break;
1914
1073
case 'i': /* --interface */
1915
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1916
arg, (int)',');
1917
if(ret_errno != 0){
1918
argp_error(state, "%s", strerror(ret_errno));
1919
}
1074
interface = arg;
1920
1075
break;
1921
1076
case 's': /* --seckey */
1922
1077
seckey = arg;
1929
1084
tmpmax = strtoimax(arg, &tmp, 10);
1930
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1931
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1932
argp_error(state, "Bad number of DH bits");
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1933
1089
}
1934
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1935
1091
break;
1940
1096
errno = 0;
1941
1097
delay = strtof(arg, &tmp);
1942
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1943
argp_error(state, "Bad delay");
1944
}
1945
case 132: /* --retry */
1946
errno = 0;
1947
retry_interval = strtod(arg, &tmp);
1948
if(errno != 0 or tmp == arg or *tmp != '\0'
1949
or (retry_interval * 1000) > INT_MAX
1950
or retry_interval < 0){
1951
argp_error(state, "Bad retry interval");
1952
}
1953
break;
1954
case 133: /* --network-hook-dir */
1955
hookdir = arg;
1956
break;
1957
/*
1958
* These reproduce what we would get without ARGP_NO_HELP
1959
*/
1960
case '?': /* --help */
1961
argp_state_help(state, state->out_stream,
1962
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1963
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1964
case -3: /* --usage */
1965
argp_state_help(state, state->out_stream,
1966
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1967
case 'V': /* --version */
1968
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1969
exit(argp_err_exit_status);
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:
1970
1106
break;
1971
1107
default:
1972
1108
return ARGP_ERR_UNKNOWN;
1973
1109
}
1974
return errno;
1110
return 0;
1975
1111
}
1976
1112
1977
1113
struct argp argp = { .options = options, .parser = parse_opt,
1978
1114
.args_doc = "",
1979
1115
.doc = "Mandos client -- Get and decrypt"
1980
1116
" passwords from a Mandos server" };
1981
ret = argp_parse(&argp, argc, argv,
1982
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1983
switch(ret){
1984
case 0:
1985
break;
1986
case ENOMEM:
1987
default:
1988
errno = ret;
1989
perror_plus("argp_parse");
1990
exitcode = EX_OSERR;
1991
goto end;
1992
case EINVAL:
1993
exitcode = EX_USAGE;
1994
goto end;
1995
}
1996
}
1997
1998
{
1999
/* Work around Debian bug #633582:
2000
<http://bugs.debian.org/633582> */
2001
2002
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2004
struct stat st;
2005
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
int seckey_fd = open(seckey, O_RDONLY);
2008
if(seckey_fd == -1){
2009
perror_plus("open");
2010
} else {
2011
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2012
if(ret == -1){
2013
perror_plus("fstat");
2014
} else {
2015
if(S_ISREG(st.st_mode)
2016
and st.st_uid == 0 and st.st_gid == 0){
2017
ret = fchown(seckey_fd, uid, gid);
2018
if(ret == -1){
2019
perror_plus("fchown");
2020
}
2021
}
2022
}
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2024
}
2025
}
2026
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2029
if(pubkey_fd == -1){
2030
perror_plus("open");
2031
} else {
2032
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2033
if(ret == -1){
2034
perror_plus("fstat");
2035
} else {
2036
if(S_ISREG(st.st_mode)
2037
and st.st_uid == 0 and st.st_gid == 0){
2038
ret = fchown(pubkey_fd, uid, gid);
2039
if(ret == -1){
2040
perror_plus("fchown");
2041
}
2042
}
2043
}
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2048
/* Lower privileges */
2049
lower_privileges();
2050
}
2051
}
2052
2053
/* Remove invalid interface names (except "none") */
2054
{
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2057
interface))){
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2063
}
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2065
interface = NULL;
2066
}
2067
}
2068
}
2069
2070
/* Run network hooks */
2071
{
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
2076
goto end;
2077
}
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2080
}
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
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;
2083
1121
goto end;
2084
1122
}
2085
1123
}
2092
1130
from the signal handler */
2093
1131
/* Initialize the pseudo-RNG for Avahi */
2094
1132
srand((unsigned int) time(NULL));
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
2097
fprintf_plus(stderr,
2098
"Avahi: Failed to create simple poll object.\n");
2099
exitcode = EX_UNAVAILABLE;
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;
2100
1137
goto end;
2101
1138
}
2102
1139
2103
1140
sigemptyset(&sigterm_action.sa_mask);
2104
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2105
1142
if(ret == -1){
2106
perror_plus("sigaddset");
2107
exitcode = EX_OSERR;
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
2108
1145
goto end;
2109
1146
}
2110
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2111
1148
if(ret == -1){
2112
perror_plus("sigaddset");
2113
exitcode = EX_OSERR;
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
2114
1151
goto end;
2115
1152
}
2116
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2117
1154
if(ret == -1){
2118
perror_plus("sigaddset");
2119
exitcode = EX_OSERR;
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
2120
1157
goto end;
2121
1158
}
2122
1159
/* Need to check if the handler is SIG_IGN before handling:
2125
1162
*/
2126
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2127
1164
if(ret == -1){
2128
perror_plus("sigaction");
2129
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2130
1167
}
2131
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2132
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
2133
1170
if(ret == -1){
2134
perror_plus("sigaction");
2135
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2136
1173
goto end;
2137
1174
}
2138
1175
}
2139
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2140
1177
if(ret == -1){
2141
perror_plus("sigaction");
2142
return EX_OSERR;
1178
perror("sigaction");
1179
return EXIT_FAILURE;
2143
1180
}
2144
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
2145
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2146
1183
if(ret == -1){
2147
perror_plus("sigaction");
2148
exitcode = EX_OSERR;
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
2149
1186
goto end;
2150
1187
}
2151
1188
}
2152
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2153
1190
if(ret == -1){
2154
perror_plus("sigaction");
2155
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2156
1193
}
2157
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
2158
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2159
1196
if(ret == -1){
2160
perror_plus("sigaction");
2161
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2162
1199
goto end;
2163
1200
}
2164
1201
}
2165
1202
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2171
alphasort);
2172
if(ret >= 1){
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2177
if(ret_errno != 0){
2178
errno = ret_errno;
2179
perror_plus("argz_add");
2180
continue;
2181
}
2182
if(debug){
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
2185
}
2186
}
2187
free(direntries);
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");
1288
}
1289
}
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
break;
1307
}
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
}
2188
1338
} else {
2189
free(direntries);
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2192
goto end;
2193
}
2194
}
2195
2196
/* Bring up interfaces which are down, and remove any "none"s */
2197
{
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2200
interface))){
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2211
interface);
2212
interface = NULL;
2213
}
2214
}
2215
break;
2216
}
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2223
} else {
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2229
perror_plus("argz_add");
2230
}
2231
}
2232
}
2233
}
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2236
}
2237
}
2238
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2241
if(debug){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2243
mc.interfaces);
2244
}
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
2246
1345
}
2247
1346
2248
1347
if(quit_now){
2249
1348
goto end;
2250
1349
}
2251
1350
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
1351
ret = init_gnutls_global(pubkey, seckey);
2253
1352
if(ret == -1){
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
2255
exitcode = EX_UNAVAILABLE;
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2256
1355
goto end;
2257
1356
} else {
2258
1357
gnutls_initialized = true;
2262
1361
goto end;
2263
1362
}
2264
1363
1364
tempdir_created = true;
2265
1365
if(mkdtemp(tempdir) == NULL){
2266
perror_plus("mkdtemp");
1366
tempdir_created = false;
1367
perror("mkdtemp");
2267
1368
goto end;
2268
1369
}
2269
tempdir_created = true;
2270
1370
2271
1371
if(quit_now){
2272
1372
goto end;
2273
1373
}
2274
1374
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2276
fprintf_plus(stderr, "init_gpgme failed\n");
2277
exitcode = EX_UNAVAILABLE;
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2278
1378
goto end;
2279
1379
} else {
2280
1380
gpgme_initialized = true;
2288
1388
/* Connect directly, do not use Zeroconf */
2289
1389
/* (Mainly meant for debugging) */
2290
1390
char *address = strrchr(connect_to, ':');
2291
2292
1391
if(address == NULL){
2293
fprintf_plus(stderr, "No colon in address\n");
2294
exitcode = EX_USAGE;
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2295
1394
goto end;
2296
1395
}
2297
1396
2299
1398
goto end;
2300
1399
}
2301
1400
2302
in_port_t port;
1401
uint16_t port;
2303
1402
errno = 0;
2304
1403
tmpmax = strtoimax(address+1, &tmp, 10);
2305
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2306
or tmpmax != (in_port_t)tmpmax){
2307
fprintf_plus(stderr, "Bad port number\n");
2308
exitcode = EX_USAGE;
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2309
1408
goto end;
2310
1409
}
2311
1410
2312
1411
if(quit_now){
2313
1412
goto end;
2314
1413
}
2315
1414
2316
port = (in_port_t)tmpmax;
1415
port = (uint16_t)tmpmax;
2317
1416
*address = '\0';
1417
address = connect_to;
2318
1418
/* Colon in address indicates IPv6 */
2319
1419
int af;
2320
if(strchr(connect_to, ':') != NULL){
1420
if(strchr(address, ':') != NULL){
2321
1421
af = AF_INET6;
2322
/* Accept [] around IPv6 address - see RFC 5952 */
2323
if(connect_to[0] == '[' and address[-1] == ']')
2324
{
2325
connect_to++;
2326
address[-1] = '\0';
2327
}
2328
1422
} else {
2329
1423
af = AF_INET;
2330
1424
}
2331
address = connect_to;
2332
1425
2333
1426
if(quit_now){
2334
1427
goto end;
2335
1428
}
2336
1429
2337
while(not quit_now){
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2340
if(quit_now or ret == 0){
2341
break;
2342
}
2343
if(debug){
2344
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
(int)retry_interval);
2346
}
2347
sleep((unsigned int)retry_interval);
2348
}
2349
2350
if (not quit_now){
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
2351
1434
exitcode = EXIT_SUCCESS;
2352
1435
}
2353
2354
1436
goto end;
2355
1437
}
2356
1438
2368
1450
config.publish_domain = 0;
2369
1451
2370
1452
/* Allocate a new server */
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
2373
1456
2374
1457
/* Free the Avahi configuration data */
2375
1458
avahi_server_config_free(&config);
2377
1460
2378
1461
/* Check if creating the Avahi server object succeeded */
2379
1462
if(mc.server == NULL){
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
2382
exitcode = EX_UNAVAILABLE;
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
2383
1466
goto end;
2384
1467
}
2385
1468
2390
1473
/* Create the Avahi service browser */
2391
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
2392
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
1476
NULL, 0, browse_callback, NULL);
2395
1477
if(sb == NULL){
2396
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
avahi_strerror(avahi_server_errno(mc.server)));
2398
exitcode = EX_UNAVAILABLE;
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
2399
1481
goto end;
2400
1482
}
2401
1483
2406
1488
/* Run the main loop */
2407
1489
2408
1490
if(debug){
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2410
}
2411
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2414
if(debug){
2415
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
(ret == 0) ? "successfully" : "with error");
2417
}
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
2418
1495
2419
1496
end:
2420
1497
2421
1498
if(debug){
2422
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1499
fprintf(stderr, "%s exiting\n", argv[0]);
2423
1500
}
2424
1501
2425
1502
/* Cleanup things */
2426
free(mc.interfaces);
2427
2428
1503
if(sb != NULL)
2429
1504
avahi_s_service_browser_free(sb);
2430
1505
2431
1506
if(mc.server != NULL)
2432
1507
avahi_server_free(mc.server);
2433
1508
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
2436
1511
2437
1512
if(gnutls_initialized){
2438
1513
gnutls_certificate_free_credentials(mc.cred);
2444
1519
gpgme_release(mc.ctx);
2445
1520
}
2446
1521
2447
/* Cleans up the circular linked list of Mandos servers the client
2448
has seen */
2449
if(mc.current_server != NULL){
2450
mc.current_server->prev->next = NULL;
2451
while(mc.current_server != NULL){
2452
server *next = mc.current_server->next;
2453
free(mc.current_server);
2454
mc.current_server = next;
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");
2455
1529
}
2456
}
2457
2458
/* Re-raise priviliges */
2459
{
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
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");
2476
1539
}
2477
1540
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
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");
2481
1550
}
2482
1551
}
2483
2484
lower_privileges_permanently();
2485
1552
}
2486
1553
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2489
2490
/* Removes the GPGME temp directory and all files inside */
1554
/* Removes the temp directory used by GPGME */
2491
1555
if(tempdir_created){
2492
struct dirent **direntries = NULL;
2493
struct dirent *direntry = NULL;
2494
int numentries = scandir(tempdir, &direntries, notdotentries,
2495
alphasort);
2496
if (numentries > 0){
2497
for(int i = 0; i < numentries; i++){
2498
direntry = direntries[i];
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
}
2499
1576
char *fullname = NULL;
2500
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
2501
1578
direntry->d_name);
2502
1579
if(ret < 0){
2503
perror_plus("asprintf");
1580
perror("asprintf");
2504
1581
continue;
2505
1582
}
2506
1583
ret = remove(fullname);
2507
1584
if(ret == -1){
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2509
strerror(errno));
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
2510
1587
}
2511
1588
free(fullname);
2512
1589
}
2513
}
2514
2515
/* need to clean even if 0 because man page doesn't specify */
2516
free(direntries);
2517
if (numentries == -1){
2518
perror_plus("scandir");
1590
closedir(d);
2519
1591
}
2520
1592
ret = rmdir(tempdir);
2521
1593
if(ret == -1 and errno != ENOENT){
2522
perror_plus("rmdir");
1594
perror("rmdir");
2523
1595
}
2524
1596
}
2525
1597
2526
1598
if(quit_now){
2527
1599
sigemptyset(&old_sigterm_action.sa_mask);
2528
1600
old_sigterm_action.sa_handler = SIG_DFL;
2529
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2530
&old_sigterm_action,
2531
NULL));
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2532
1602
if(ret == -1){
2533
perror_plus("sigaction");
2534
}
2535
do {
2536
ret = raise(signal_received);
2537
} while(ret != 0 and errno == EINTR);
2538
if(ret != 0){
2539
perror_plus("raise");
2540
abort();
2541
}
2542
TEMP_FAILURE_RETRY(pause());
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
2543
1606
}
2544
1607
2545
1608
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0