(root)/mandos/release
» Revision
237.7.217
(compared to revision 237.2.131)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:55:54 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 311.
- Revision ID: teddy@recompile.se-20140310065554-of3kz8jdhlll42l3
Use "struct sockaddr_storage" instead of a union in mandos-client.
Apparently using struct sockaddr_storage the way POSIX intended is
incompatible with strict aliasing, so turn that off in the Makefile.
* plugins.d/mandos-client.c (start_mandos_communication): Change "to"
from a union
to a struct
sockaddr_storage.
* Makefile (OPTIMIZE): Add "-fno-strict-aliasing".
Apparently using struct sockaddr_storage the way POSIX intended is
incompatible with strict aliasing, so turn that off in the Makefile.
* plugins.d/mandos-client.c (start_mandos_communication): Change "to"
from a union
to a struct
sockaddr_storage.
* Makefile (OPTIMIZE): Add "-fno-strict-aliasing".
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
84
sigaction(), SIGTERM, sig_atomic_t,
84
85
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() */
85
97
86
98
#ifdef __linux__
87
99
#include <sys/klog.h> /* klogctl() */
105
117
init_gnutls_session(),
106
118
GNUTLS_* */
107
119
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
110
122
111
123
/* GPGME */
112
124
#include <gpgme.h> /* All GPGME types, constants and
120
132
#define PATHDIR "/conf/conf.d/mandos"
121
133
#define SECKEY "seckey.txt"
122
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
136
124
137
bool debug = false;
125
138
static const char mandos_protocol_version[] = "1";
126
139
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
128
157
129
158
/* Used for passing in values through the Avahi callback functions */
130
159
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
160
AvahiServer *server;
133
161
gnutls_certificate_credentials_t cred;
134
162
unsigned int dh_bits;
135
163
gnutls_dh_params_t dh_params;
136
164
const char *priority;
137
165
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
138
169
} mandos_context;
139
170
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" };
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
}
144
195
145
196
/*
146
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
148
199
* "buffer_length" is how much is already used.
149
200
*/
150
201
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
202
size_t buffer_capacity){
152
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
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;
155
210
return 0;
156
211
}
212
*buffer = new_buf;
157
213
buffer_capacity += BUFFER_SIZE;
158
214
}
159
215
return buffer_capacity;
160
216
}
161
217
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
162
255
/*
163
256
* Initialize GPGME.
164
257
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
167
260
gpgme_error_t rc;
168
261
gpgme_engine_info_t engine_info;
169
262
170
171
263
/*
172
264
* Helper function to insert pub and seckey to the engine keyring.
173
265
*/
178
270
179
271
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
272
if(fd == -1){
181
perror("open");
273
perror_plus("open");
182
274
return false;
183
275
}
184
276
185
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
278
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
189
281
return false;
190
282
}
191
283
192
rc = gpgme_op_import(mc.ctx, pgp_data);
284
rc = gpgme_op_import(mc->ctx, pgp_data);
193
285
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
196
288
return false;
197
289
}
198
290
199
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
292
if(ret == -1){
201
perror("close");
293
perror_plus("close");
202
294
}
203
295
gpgme_data_release(pgp_data);
204
296
return true;
205
297
}
206
298
207
299
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
300
fprintf_plus(stderr, "Initializing GPGME\n");
209
301
}
210
302
211
303
/* Init GPGME */
212
304
gpgme_check_version(NULL);
213
305
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
306
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
217
309
return false;
218
310
}
219
311
220
/* Set GPGME home directory for the OpenPGP engine only */
312
/* Set GPGME home directory for the OpenPGP engine only */
221
313
rc = gpgme_get_engine_info(&engine_info);
222
314
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
225
317
return false;
226
318
}
227
319
while(engine_info != NULL){
233
325
engine_info = engine_info->next;
234
326
}
235
327
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
237
330
return false;
238
331
}
239
332
240
333
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
334
rc = gpgme_new(&(mc->ctx));
242
335
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
245
339
return false;
246
340
}
247
341
258
352
*/
259
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
354
size_t crypto_size,
261
char **plaintext){
355
char **plaintext,
356
mandos_context *mc){
262
357
gpgme_data_t dh_crypto, dh_plain;
263
358
gpgme_error_t rc;
264
359
ssize_t ret;
266
361
ssize_t plaintext_length = 0;
267
362
268
363
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
365
}
271
366
272
367
/* Create new GPGME data buffer from memory cryptotext */
273
368
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
369
0);
275
370
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
278
373
return -1;
279
374
}
280
375
281
376
/* Create new empty GPGME data buffer for the plaintext */
282
377
rc = gpgme_data_new(&dh_plain);
283
378
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
286
382
gpgme_data_release(dh_crypto);
287
383
return -1;
288
384
}
289
385
290
386
/* Decrypt data from the cryptotext data buffer to the plaintext
291
387
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
389
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
296
392
plaintext_length = -1;
297
393
if(debug){
298
394
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
395
result = gpgme_op_decrypt_result(mc->ctx);
300
396
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
398
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
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);
307
403
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
405
}
310
406
gpgme_recipient_t recipient;
311
407
recipient = result->recipients;
312
408
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
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");
319
416
recipient = recipient->next;
320
417
}
321
418
}
324
421
}
325
422
326
423
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
328
425
}
329
426
330
427
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
428
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
429
perror_plus("gpgme_data_seek");
333
430
plaintext_length = -1;
334
431
goto decrypt_end;
335
432
}
337
434
*plaintext = NULL;
338
435
while(true){
339
436
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
341
plaintext_capacity);
437
(size_t)plaintext_length,
438
plaintext_capacity);
342
439
if(plaintext_capacity == 0){
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
346
443
}
347
444
348
445
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
353
450
break;
354
451
}
355
452
if(ret < 0){
356
perror("gpgme_data_read");
453
perror_plus("gpgme_data_read");
357
454
plaintext_length = -1;
358
455
goto decrypt_end;
359
456
}
361
458
}
362
459
363
460
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
461
fprintf_plus(stderr, "Decrypted password is: ");
365
462
for(ssize_t i = 0; i < plaintext_length; i++){
366
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
464
}
379
476
}
380
477
381
478
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
479
const char *ret = gnutls_strerror(value);
384
480
if(ret == NULL)
385
481
ret = "(unknown)";
386
482
return ret;
389
485
/* GnuTLS log function callback */
390
486
static void debuggnutls(__attribute__((unused)) int level,
391
487
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
488
fprintf_plus(stderr, "GnuTLS: %s", string);
393
489
}
394
490
395
491
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
492
const char *seckeyfilename,
493
mandos_context *mc){
397
494
int ret;
398
495
399
496
if(debug){
400
fprintf(stderr, "Initializing GnuTLS\n");
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
401
498
}
402
499
403
500
ret = gnutls_global_init();
404
501
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
407
504
return -1;
408
505
}
409
506
416
513
}
417
514
418
515
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
420
517
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
426
520
gnutls_global_deinit();
427
521
return -1;
428
522
}
429
523
430
524
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
434
529
}
435
530
436
531
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
532
(mc->cred, pubkeyfilename, seckeyfilename,
438
533
GNUTLS_OPENPGP_FMT_BASE64);
439
534
if(ret != GNUTLS_E_SUCCESS){
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
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));
445
540
goto globalfail;
446
541
}
447
542
448
543
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
544
ret = gnutls_dh_params_init(&mc->dh_params);
450
545
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
453
549
goto globalfail;
454
550
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
456
552
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
459
555
goto globalfail;
460
556
}
461
557
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
559
464
560
return 0;
465
561
466
562
globalfail:
467
563
468
gnutls_certificate_free_credentials(mc.cred);
564
gnutls_certificate_free_credentials(mc->cred);
469
565
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
566
gnutls_dh_params_deinit(mc->dh_params);
471
567
return -1;
472
568
}
473
569
474
static int init_gnutls_session(gnutls_session_t *session){
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
475
572
int ret;
476
573
/* GnuTLS session creation */
477
574
do {
478
575
ret = gnutls_init(session, GNUTLS_SERVER);
576
if(quit_now){
577
return -1;
578
}
479
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
580
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
483
584
}
484
585
485
586
{
486
587
const char *err;
487
588
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
590
if(quit_now){
591
gnutls_deinit(*session);
592
return -1;
593
}
489
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
595
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
494
599
gnutls_deinit(*session);
495
600
return -1;
496
601
}
498
603
499
604
do {
500
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
606
mc->cred);
607
if(quit_now){
608
gnutls_deinit(*session);
609
return -1;
610
}
502
611
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
612
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
506
615
gnutls_deinit(*session);
507
616
return -1;
508
617
}
510
619
/* ignore client certificate if any. */
511
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
512
621
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
514
623
515
624
return 0;
516
625
}
519
628
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
520
629
__attribute__((unused)) const char *txt){}
521
630
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
525
631
/* Called when a Mandos server is found */
526
static int start_mandos_communication(const char *ip, uint16_t port,
632
static int start_mandos_communication(const char *ip, in_port_t port,
527
633
AvahiIfIndex if_index,
528
int af){
634
int af, mandos_context *mc){
529
635
int ret, tcp_sd = -1;
530
636
ssize_t sret;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
637
struct sockaddr_storage to;
535
638
char *buffer = NULL;
536
char *decrypted_buffer;
639
char *decrypted_buffer = NULL;
537
640
size_t buffer_length = 0;
538
641
size_t buffer_capacity = 0;
539
642
size_t written;
540
int retval = 0;
643
int retval = -1;
541
644
gnutls_session_t session;
542
645
int pf; /* Protocol family */
543
646
647
errno = 0;
648
544
649
if(quit_now){
650
errno = EINTR;
545
651
return -1;
546
652
}
547
653
553
659
pf = PF_INET;
554
660
break;
555
661
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
errno = EINVAL;
557
664
return -1;
558
665
}
559
666
560
ret = init_gnutls_session(&session);
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);
561
700
if(ret != 0){
562
701
return -1;
563
702
}
564
703
565
704
if(debug){
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
568
707
}
569
708
570
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
571
710
if(tcp_sd < 0){
572
perror("socket");
573
retval = -1;
711
int e = errno;
712
perror_plus("socket");
713
errno = e;
574
714
goto mandos_end;
575
715
}
576
716
577
717
if(quit_now){
718
errno = EINTR;
578
719
goto mandos_end;
579
720
}
580
721
581
722
memset(&to, 0, sizeof(to));
582
723
if(af == AF_INET6){
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
585
726
} else { /* IPv4 */
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
588
729
}
589
730
if(ret < 0 ){
590
perror("inet_pton");
591
retval = -1;
731
int e = errno;
732
perror_plus("inet_pton");
733
errno = e;
592
734
goto mandos_end;
593
735
}
594
736
if(ret == 0){
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
737
int e = errno;
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
739
errno = e;
597
740
goto mandos_end;
598
741
}
599
742
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
607
746
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
747
fprintf_plus(stderr, "An IPv6 link-local address is"
748
" incomplete without a network interface\n");
749
errno = EINVAL;
611
750
goto mandos_end;
612
751
}
613
752
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
615
754
}
616
755
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
620
757
}
621
758
622
759
if(quit_now){
760
errno = EINTR;
623
761
goto mandos_end;
624
762
}
625
763
627
765
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
766
char interface[IF_NAMESIZE];
629
767
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
768
perror_plus("if_indextoname");
631
769
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
634
772
}
635
773
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
638
776
}
639
777
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
778
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
642
779
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
645
784
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
648
789
}
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
}
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);
655
796
}
656
797
}
657
798
658
799
if(quit_now){
800
errno = EINTR;
659
801
goto mandos_end;
660
802
}
661
803
662
804
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
664
807
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
666
810
}
667
811
if(ret < 0){
668
perror("connect");
669
retval = -1;
812
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
int e = errno;
814
perror_plus("connect");
815
errno = e;
816
}
670
817
goto mandos_end;
671
818
}
672
819
673
820
if(quit_now){
821
errno = EINTR;
674
822
goto mandos_end;
675
823
}
676
824
679
827
while(true){
680
828
size_t out_size = strlen(out);
681
829
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
682
out_size - written));
830
out_size - written));
683
831
if(ret == -1){
684
perror("write");
685
retval = -1;
832
int e = errno;
833
perror_plus("write");
834
errno = e;
686
835
goto mandos_end;
687
836
}
688
837
written += (size_t)ret;
698
847
}
699
848
700
849
if(quit_now){
850
errno = EINTR;
701
851
goto mandos_end;
702
852
}
703
853
}
704
854
705
855
if(debug){
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
856
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
707
857
}
708
858
709
859
if(quit_now){
860
errno = EINTR;
710
861
goto mandos_end;
711
862
}
712
863
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
714
869
715
870
if(quit_now){
871
errno = EINTR;
716
872
goto mandos_end;
717
873
}
718
874
719
875
do {
720
876
ret = gnutls_handshake(session);
721
877
if(quit_now){
878
errno = EINTR;
722
879
goto mandos_end;
723
880
}
724
881
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
725
882
726
883
if(ret != GNUTLS_E_SUCCESS){
727
884
if(debug){
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
885
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
729
886
gnutls_perror(ret);
730
887
}
731
retval = -1;
888
errno = EPROTO;
732
889
goto mandos_end;
733
890
}
734
891
735
892
/* Read OpenPGP packet that contains the wanted password */
736
893
737
894
if(debug){
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
895
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
896
" %s\n", ip);
740
897
}
741
898
742
899
while(true){
743
900
744
901
if(quit_now){
902
errno = EINTR;
745
903
goto mandos_end;
746
904
}
747
905
748
906
buffer_capacity = incbuffer(&buffer, buffer_length,
749
buffer_capacity);
907
buffer_capacity);
750
908
if(buffer_capacity == 0){
751
perror("incbuffer");
752
retval = -1;
909
int e = errno;
910
perror_plus("incbuffer");
911
errno = e;
753
912
goto mandos_end;
754
913
}
755
914
756
915
if(quit_now){
916
errno = EINTR;
757
917
goto mandos_end;
758
918
}
759
919
772
932
ret = gnutls_handshake(session);
773
933
774
934
if(quit_now){
935
errno = EINTR;
775
936
goto mandos_end;
776
937
}
777
938
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
778
939
if(ret < 0){
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
940
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
941
"***\n");
780
942
gnutls_perror(ret);
781
retval = -1;
943
errno = EPROTO;
782
944
goto mandos_end;
783
945
}
784
946
break;
785
947
default:
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
948
fprintf_plus(stderr, "Unknown error while reading data from"
949
" encrypted session with Mandos server\n");
789
950
gnutls_bye(session, GNUTLS_SHUT_RDWR);
951
errno = EIO;
790
952
goto mandos_end;
791
953
}
792
954
} else {
795
957
}
796
958
797
959
if(debug){
798
fprintf(stderr, "Closing TLS session\n");
799
}
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
960
fprintf_plus(stderr, "Closing TLS session\n");
961
}
962
963
if(quit_now){
964
errno = EINTR;
965
goto mandos_end;
966
}
967
968
do {
969
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
970
if(quit_now){
971
errno = EINTR;
972
goto mandos_end;
973
}
974
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
810
975
811
976
if(buffer_length > 0){
812
977
ssize_t decrypted_buffer_size;
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
815
&decrypted_buffer);
978
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
979
&decrypted_buffer, mc);
816
980
if(decrypted_buffer_size >= 0){
817
981
818
982
written = 0;
819
983
while(written < (size_t) decrypted_buffer_size){
820
984
if(quit_now){
985
errno = EINTR;
821
986
goto mandos_end;
822
987
}
823
988
825
990
(size_t)decrypted_buffer_size - written,
826
991
stdout);
827
992
if(ret == 0 and ferror(stdout)){
993
int e = errno;
828
994
if(debug){
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
995
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
996
strerror(errno));
831
997
}
832
retval = -1;
833
break;
998
errno = e;
999
goto mandos_end;
834
1000
}
835
1001
written += (size_t)ret;
836
1002
}
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
1003
retval = 0;
840
1004
}
841
} else {
842
retval = -1;
843
1005
}
844
1006
845
1007
/* Shutdown procedure */
846
1008
847
1009
mandos_end:
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1010
{
1011
int e = errno;
1012
free(decrypted_buffer);
1013
free(buffer);
1014
if(tcp_sd >= 0){
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1016
}
1017
if(ret == -1){
1018
if(e == 0){
1019
e = errno;
1020
}
1021
perror_plus("close");
1022
}
1023
gnutls_deinit(session);
1024
errno = e;
1025
if(quit_now){
1026
errno = EINTR;
1027
retval = -1;
1028
}
858
1029
}
859
1030
return retval;
860
1031
}
872
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
1045
flags,
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
877
1050
878
1051
/* Called whenever a service has been resolved successfully or
879
1052
timed out */
885
1058
switch(event){
886
1059
default:
887
1060
case AVAHI_RESOLVER_FAILURE:
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
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)));
891
1066
break;
892
1067
893
1068
case AVAHI_RESOLVER_FOUND:
895
1070
char ip[AVAHI_ADDRESS_STR_MAX];
896
1071
avahi_address_snprint(ip, sizeof(ip), address);
897
1072
if(debug){
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
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);
901
1076
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
904
1081
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
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
}
906
1090
}
907
1091
}
908
1092
}
918
1102
const char *domain,
919
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
1104
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
923
1109
924
1110
/* Called whenever a new services becomes available on the LAN or
925
1111
is removed from the LAN */
932
1118
default:
933
1119
case AVAHI_BROWSER_FAILURE:
934
1120
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
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);
938
1125
return;
939
1126
940
1127
case AVAHI_BROWSER_NEW:
943
1130
the callback function is called the Avahi server will free the
944
1131
resolver for us. */
945
1132
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)));
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)));
951
1141
break;
952
1142
953
1143
case AVAHI_BROWSER_REMOVE:
956
1146
case AVAHI_BROWSER_ALL_FOR_NOW:
957
1147
case AVAHI_BROWSER_CACHE_EXHAUSTED:
958
1148
if(debug){
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1149
fprintf_plus(stderr, "No Mandos server found, still"
1150
" searching...\n");
960
1151
}
961
1152
break;
962
1153
}
963
1154
}
964
1155
965
/* stop main loop after sigterm has been called */
1156
/* Signal handler that stops main loop after SIGTERM */
966
1157
static void handle_sigterm(int sig){
967
1158
if(quit_now){
968
1159
return;
970
1161
quit_now = 1;
971
1162
signal_received = sig;
972
1163
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
1164
/* set main loop to exit */
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1167
}
1168
errno = old_errno;
1169
}
1170
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
/*
1238
* This function determines if a directory entry in /sys/class/net
1239
* corresponds to an acceptable network device.
1240
* (This function is passed to scandir(3) as a filter function.)
1241
*/
1242
int good_interface(const struct dirent *if_entry){
1243
if(if_entry->d_name[0] == '.'){
1244
return 0;
1245
}
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
}
1359
if(debug){
1360
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1361
direntry->d_name);
1362
}
1363
return 1;
1364
}
1365
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;
977
1792
}
978
1793
979
1794
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 };
980
1799
AvahiSServiceBrowser *sb = NULL;
981
int error;
1800
error_t ret_errno;
982
1801
int ret;
983
1802
intmax_t tmpmax;
984
1803
char *tmp;
985
1804
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
993
1807
char tempdir[] = "/tmp/mandosXXXXXX";
994
1808
bool tempdir_created = false;
995
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
1810
const char *seckey = PATHDIR "/" SECKEY;
997
1811
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
998
1813
999
1814
bool gnutls_initialized = false;
1000
1815
bool gpgme_initialized = false;
1001
1816
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1002
1819
1003
struct sigaction old_sigterm_action;
1820
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1004
1821
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1005
1822
1006
1823
uid = getuid();
1010
1827
errno = 0;
1011
1828
ret = setgid(gid);
1012
1829
if(ret == -1){
1013
perror("setgid");
1830
perror_plus("setgid");
1014
1831
}
1015
1832
1016
1833
/* Lower user privileges (temporarily) */
1017
1834
errno = 0;
1018
1835
ret = seteuid(uid);
1019
1836
if(ret == -1){
1020
perror("seteuid");
1837
perror_plus("seteuid");
1021
1838
}
1022
1839
1023
1840
if(quit_now){
1058
1875
.arg = "SECONDS",
1059
1876
.doc = "Maximum delay to wait for interface startup",
1060
1877
.group = 2 },
1878
{ .name = "retry", .key = 132,
1879
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1885
.group = 2 },
1886
/*
1887
* These reproduce what we would get without ARGP_NO_HELP
1888
*/
1889
{ .name = "help", .key = '?',
1890
.doc = "Give this help list", .group = -1 },
1891
{ .name = "usage", .key = -3,
1892
.doc = "Give a short usage message", .group = -1 },
1893
{ .name = "version", .key = 'V',
1894
.doc = "Print program version", .group = -1 },
1061
1895
{ .name = NULL }
1062
1896
};
1063
1897
1064
1898
error_t parse_opt(int key, char *arg,
1065
1899
struct argp_state *state){
1900
errno = 0;
1066
1901
switch(key){
1067
1902
case 128: /* --debug */
1068
1903
debug = true;
1071
1906
connect_to = arg;
1072
1907
break;
1073
1908
case 'i': /* --interface */
1074
interface = arg;
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1075
1914
break;
1076
1915
case 's': /* --seckey */
1077
1916
seckey = arg;
1084
1923
tmpmax = strtoimax(arg, &tmp, 10);
1085
1924
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
1925
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1926
argp_error(state, "Bad number of DH bits");
1089
1927
}
1090
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1091
1929
break;
1096
1934
errno = 0;
1097
1935
delay = strtof(arg, &tmp);
1098
1936
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
1937
argp_error(state, "Bad delay");
1938
}
1939
case 132: /* --retry */
1940
errno = 0;
1941
retry_interval = strtod(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'
1943
or (retry_interval * 1000) > INT_MAX
1944
or retry_interval < 0){
1945
argp_error(state, "Bad retry interval");
1946
}
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1951
/*
1952
* These reproduce what we would get without ARGP_NO_HELP
1953
*/
1954
case '?': /* --help */
1955
argp_state_help(state, state->out_stream,
1956
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1957
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1958
case -3: /* --usage */
1959
argp_state_help(state, state->out_stream,
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
exit(argp_err_exit_status);
1106
1964
break;
1107
1965
default:
1108
1966
return ARGP_ERR_UNKNOWN;
1109
1967
}
1110
return 0;
1968
return errno;
1111
1969
}
1112
1970
1113
1971
struct argp argp = { .options = options, .parser = parse_opt,
1114
1972
.args_doc = "",
1115
1973
.doc = "Mandos client -- Get and decrypt"
1116
1974
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
1978
case 0:
1979
break;
1980
case ENOMEM:
1981
default:
1982
errno = ret;
1983
perror_plus("argp_parse");
1984
exitcode = EX_OSERR;
1985
goto end;
1986
case EINVAL:
1987
exitcode = EX_USAGE;
1988
goto end;
1989
}
1990
}
1991
1992
{
1993
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
1995
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
1121
2077
goto end;
1122
2078
}
1123
2079
}
1130
2086
from the signal handler */
1131
2087
/* Initialize the pseudo-RNG for Avahi */
1132
2088
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
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");
2093
exitcode = EX_UNAVAILABLE;
1137
2094
goto end;
1138
2095
}
1139
2096
1140
2097
sigemptyset(&sigterm_action.sa_mask);
1141
2098
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
2099
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
2100
perror_plus("sigaddset");
2101
exitcode = EX_OSERR;
1145
2102
goto end;
1146
2103
}
1147
2104
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
2105
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
2106
perror_plus("sigaddset");
2107
exitcode = EX_OSERR;
1151
2108
goto end;
1152
2109
}
1153
2110
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
2111
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
2112
perror_plus("sigaddset");
2113
exitcode = EX_OSERR;
1157
2114
goto end;
1158
2115
}
1159
2116
/* Need to check if the handler is SIG_IGN before handling:
1162
2119
*/
1163
2120
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1164
2121
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2122
perror_plus("sigaction");
2123
return EX_OSERR;
1167
2124
}
1168
2125
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
2126
ret = sigaction(SIGINT, &sigterm_action, NULL);
1170
2127
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2128
perror_plus("sigaction");
2129
exitcode = EX_OSERR;
1173
2130
goto end;
1174
2131
}
1175
2132
}
1176
2133
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
2134
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
2135
perror_plus("sigaction");
2136
return EX_OSERR;
1180
2137
}
1181
2138
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
2139
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
2140
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
2141
perror_plus("sigaction");
2142
exitcode = EX_OSERR;
1186
2143
goto end;
1187
2144
}
1188
2145
}
1189
2146
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1190
2147
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2148
perror_plus("sigaction");
2149
return EX_OSERR;
1193
2150
}
1194
2151
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
2152
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1196
2153
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
if(if_index == 0){
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
2154
perror_plus("sigaction");
2155
exitcode = EX_OSERR;
2156
goto end;
2157
}
2158
}
2159
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);
2182
} 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;
1288
2207
}
1289
2208
}
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
2209
break;
1307
2210
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
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);
1345
2240
}
1346
2241
1347
2242
if(quit_now){
1348
2243
goto end;
1349
2244
}
1350
2245
1351
ret = init_gnutls_global(pubkey, seckey);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
1352
2247
if(ret == -1){
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2249
exitcode = EX_UNAVAILABLE;
1355
2250
goto end;
1356
2251
} else {
1357
2252
gnutls_initialized = true;
1361
2256
goto end;
1362
2257
}
1363
2258
2259
if(mkdtemp(tempdir) == NULL){
2260
perror_plus("mkdtemp");
2261
goto end;
2262
}
1364
2263
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
1368
goto end;
1369
}
1370
2264
1371
2265
if(quit_now){
1372
2266
goto end;
1373
2267
}
1374
2268
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2270
fprintf_plus(stderr, "init_gpgme failed\n");
2271
exitcode = EX_UNAVAILABLE;
1378
2272
goto end;
1379
2273
} else {
1380
2274
gpgme_initialized = true;
1388
2282
/* Connect directly, do not use Zeroconf */
1389
2283
/* (Mainly meant for debugging) */
1390
2284
char *address = strrchr(connect_to, ':');
2285
1391
2286
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2287
fprintf_plus(stderr, "No colon in address\n");
2288
exitcode = EX_USAGE;
1394
2289
goto end;
1395
2290
}
1396
2291
1398
2293
goto end;
1399
2294
}
1400
2295
1401
uint16_t port;
2296
in_port_t port;
1402
2297
errno = 0;
1403
2298
tmpmax = strtoimax(address+1, &tmp, 10);
1404
2299
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2300
or tmpmax != (in_port_t)tmpmax){
2301
fprintf_plus(stderr, "Bad port number\n");
2302
exitcode = EX_USAGE;
1408
2303
goto end;
1409
2304
}
1410
2305
1411
2306
if(quit_now){
1412
2307
goto end;
1413
2308
}
1414
2309
1415
port = (uint16_t)tmpmax;
2310
port = (in_port_t)tmpmax;
1416
2311
*address = '\0';
1417
address = connect_to;
1418
2312
/* Colon in address indicates IPv6 */
1419
2313
int af;
1420
if(strchr(address, ':') != NULL){
2314
if(strchr(connect_to, ':') != NULL){
1421
2315
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
}
1422
2322
} else {
1423
2323
af = AF_INET;
1424
2324
}
2325
address = connect_to;
1425
2326
1426
2327
if(quit_now){
1427
2328
goto end;
1428
2329
}
1429
2330
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
2331
while(not quit_now){
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
2334
if(quit_now or ret == 0){
2335
break;
2336
}
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
2344
if (not quit_now){
1434
2345
exitcode = EXIT_SUCCESS;
1435
2346
}
2347
1436
2348
goto end;
1437
2349
}
1438
2350
1450
2362
config.publish_domain = 0;
1451
2363
1452
2364
/* Allocate a new server */
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
1456
2367
1457
2368
/* Free the Avahi configuration data */
1458
2369
avahi_server_config_free(&config);
1460
2371
1461
2372
/* Check if creating the Avahi server object succeeded */
1462
2373
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
2376
exitcode = EX_UNAVAILABLE;
1466
2377
goto end;
1467
2378
}
1468
2379
1473
2384
/* Create the Avahi service browser */
1474
2385
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
2386
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
1477
2389
if(sb == NULL){
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
2390
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
avahi_strerror(avahi_server_errno(mc.server)));
2392
exitcode = EX_UNAVAILABLE;
1481
2393
goto end;
1482
2394
}
1483
2395
1488
2400
/* Run the main loop */
1489
2401
1490
2402
if(debug){
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
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
}
1495
2412
1496
2413
end:
1497
2414
1498
2415
if(debug){
1499
fprintf(stderr, "%s exiting\n", argv[0]);
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1500
2417
}
1501
2418
1502
2419
/* Cleanup things */
2420
free(mc.interfaces);
2421
1503
2422
if(sb != NULL)
1504
2423
avahi_s_service_browser_free(sb);
1505
2424
1506
2425
if(mc.server != NULL)
1507
2426
avahi_server_free(mc.server);
1508
2427
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
1511
2430
1512
2431
if(gnutls_initialized){
1513
2432
gnutls_certificate_free_credentials(mc.cred);
1519
2438
gpgme_release(mc.ctx);
1520
2439
}
1521
2440
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");
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;
1529
2449
}
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");
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");
1539
2470
}
1540
2471
}
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");
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
1550
2475
}
1551
2476
}
2477
2478
lower_privileges_permanently();
1552
2479
}
1553
2480
1554
/* Removes the temp directory used by GPGME */
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2483
2484
/* Removes the GPGME temp directory and all files inside */
1555
2485
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
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];
1576
2493
char *fullname = NULL;
1577
2494
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
2495
direntry->d_name);
1579
2496
if(ret < 0){
1580
perror("asprintf");
2497
perror_plus("asprintf");
1581
2498
continue;
1582
2499
}
1583
2500
ret = remove(fullname);
1584
2501
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
1587
2504
}
1588
2505
free(fullname);
1589
2506
}
1590
closedir(d);
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");
1591
2513
}
1592
2514
ret = rmdir(tempdir);
1593
2515
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
2516
perror_plus("rmdir");
1595
2517
}
1596
2518
}
1597
2519
1598
2520
if(quit_now){
1599
2521
sigemptyset(&old_sigterm_action.sa_mask);
1600
2522
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2523
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2524
&old_sigterm_action,
2525
NULL));
1602
2526
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
2527
perror_plus("sigaction");
2528
}
2529
do {
2530
ret = raise(signal_received);
2531
} while(ret != 0 and errno == EINTR);
2532
if(ret != 0){
2533
perror_plus("raise");
2534
abort();
2535
}
2536
TEMP_FAILURE_RETRY(pause());
1606
2537
}
1607
2538
1608
2539
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0