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237.7.238
(compared to revision 237.2.150)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-06-07 20:29:36 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140607202936-crh5fxrdd804oora
Fix typo in code comment.
* debian/mandos.postinst: Fix typo in comment.
* debian/mandos.postinst: Fix typo in comment.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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(), abort() */
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(), pause() */
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;
144
173
145
174
sig_atomic_t quit_now = 0;
146
175
int signal_received = 0;
147
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), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
148
196
/*
149
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
198
* bytes. "buffer_capacity" is how much is currently allocated,
151
199
* "buffer_length" is how much is already used.
152
200
*/
201
__attribute__((nonnull, warn_unused_result))
153
202
size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t buffer_capacity){
203
size_t buffer_capacity){
155
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
158
211
return 0;
159
212
}
213
*buffer = new_buf;
160
214
buffer_capacity += BUFFER_SIZE;
161
215
}
162
216
return buffer_capacity;
163
217
}
164
218
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
227
return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
256
165
257
/*
166
258
* Initialize GPGME.
167
259
*/
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
170
265
gpgme_error_t rc;
171
266
gpgme_engine_info_t engine_info;
172
267
173
174
268
/*
175
269
* Helper function to insert pub and seckey to the engine keyring.
176
270
*/
177
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
178
272
int ret;
179
273
int fd;
180
274
gpgme_data_t pgp_data;
181
275
182
276
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
183
277
if(fd == -1){
184
perror("open");
278
perror_plus("open");
185
279
return false;
186
280
}
187
281
188
282
rc = gpgme_data_new_from_fd(&pgp_data, fd);
189
283
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
192
286
return false;
193
287
}
194
288
195
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
196
290
if(rc != GPG_ERR_NO_ERROR){
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
199
293
return false;
200
294
}
201
295
202
296
ret = (int)TEMP_FAILURE_RETRY(close(fd));
203
297
if(ret == -1){
204
perror("close");
298
perror_plus("close");
205
299
}
206
300
gpgme_data_release(pgp_data);
207
301
return true;
208
302
}
209
303
210
304
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
305
fprintf_plus(stderr, "Initializing GPGME\n");
212
306
}
213
307
214
308
/* Init GPGME */
215
309
gpgme_check_version(NULL);
216
310
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
217
311
if(rc != GPG_ERR_NO_ERROR){
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
220
314
return false;
221
315
}
222
316
223
/* Set GPGME home directory for the OpenPGP engine only */
317
/* Set GPGME home directory for the OpenPGP engine only */
224
318
rc = gpgme_get_engine_info(&engine_info);
225
319
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
228
322
return false;
229
323
}
230
324
while(engine_info != NULL){
236
330
engine_info = engine_info->next;
237
331
}
238
332
if(engine_info == NULL){
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
240
335
return false;
241
336
}
242
337
243
338
/* Create new GPGME "context" */
244
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
245
340
if(rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
248
344
return false;
249
345
}
250
346
259
355
* Decrypt OpenPGP data.
260
356
* Returns -1 on error
261
357
*/
358
__attribute__((nonnull, warn_unused_result))
262
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
263
360
size_t crypto_size,
264
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
265
363
gpgme_data_t dh_crypto, dh_plain;
266
364
gpgme_error_t rc;
267
365
ssize_t ret;
269
367
ssize_t plaintext_length = 0;
270
368
271
369
if(debug){
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
371
}
274
372
275
373
/* Create new GPGME data buffer from memory cryptotext */
276
374
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
277
375
0);
278
376
if(rc != GPG_ERR_NO_ERROR){
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
281
379
return -1;
282
380
}
283
381
284
382
/* Create new empty GPGME data buffer for the plaintext */
285
383
rc = gpgme_data_new(&dh_plain);
286
384
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
289
388
gpgme_data_release(dh_crypto);
290
389
return -1;
291
390
}
292
391
293
392
/* Decrypt data from the cryptotext data buffer to the plaintext
294
393
data buffer */
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
395
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
299
398
plaintext_length = -1;
300
399
if(debug){
301
400
gpgme_decrypt_result_t result;
302
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
303
402
if(result == NULL){
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
404
} else {
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
310
409
if(result->file_name != NULL){
311
fprintf(stderr, "File name: %s\n", result->file_name);
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
411
}
313
412
gpgme_recipient_t recipient;
314
413
recipient = result->recipients;
315
414
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
322
422
recipient = recipient->next;
323
423
}
324
424
}
327
427
}
328
428
329
429
if(debug){
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
431
}
332
432
333
433
/* Seek back to the beginning of the GPGME plaintext data buffer */
334
434
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
335
perror("gpgme_data_seek");
435
perror_plus("gpgme_data_seek");
336
436
plaintext_length = -1;
337
437
goto decrypt_end;
338
438
}
340
440
*plaintext = NULL;
341
441
while(true){
342
442
plaintext_capacity = incbuffer(plaintext,
343
(size_t)plaintext_length,
344
plaintext_capacity);
443
(size_t)plaintext_length,
444
plaintext_capacity);
345
445
if(plaintext_capacity == 0){
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
446
perror_plus("incbuffer");
447
plaintext_length = -1;
448
goto decrypt_end;
349
449
}
350
450
351
451
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
456
break;
357
457
}
358
458
if(ret < 0){
359
perror("gpgme_data_read");
459
perror_plus("gpgme_data_read");
360
460
plaintext_length = -1;
361
461
goto decrypt_end;
362
462
}
364
464
}
365
465
366
466
if(debug){
367
fprintf(stderr, "Decrypted password is: ");
467
fprintf_plus(stderr, "Decrypted password is: ");
368
468
for(ssize_t i = 0; i < plaintext_length; i++){
369
469
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
370
470
}
381
481
return plaintext_length;
382
482
}
383
483
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
387
487
if(ret == NULL)
388
488
ret = "(unknown)";
389
489
return ret;
390
490
}
391
491
392
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
393
494
static void debuggnutls(__attribute__((unused)) int level,
394
495
const char* string){
395
fprintf(stderr, "GnuTLS: %s", string);
496
fprintf_plus(stderr, "GnuTLS: %s", string);
396
497
}
397
498
499
__attribute__((nonnull, warn_unused_result))
398
500
static int init_gnutls_global(const char *pubkeyfilename,
399
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
400
503
int ret;
401
504
402
505
if(debug){
403
fprintf(stderr, "Initializing GnuTLS\n");
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
404
507
}
405
508
406
509
ret = gnutls_global_init();
407
510
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
410
513
return -1;
411
514
}
412
515
419
522
}
420
523
421
524
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
423
526
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
429
529
gnutls_global_deinit();
430
530
return -1;
431
531
}
432
532
433
533
if(debug){
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
437
538
}
438
539
439
540
ret = gnutls_certificate_set_openpgp_key_file
440
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
441
542
GNUTLS_OPENPGP_FMT_BASE64);
442
543
if(ret != GNUTLS_E_SUCCESS){
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr,
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
448
549
goto globalfail;
449
550
}
450
551
451
552
/* GnuTLS server initialization */
452
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
453
554
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
456
558
goto globalfail;
457
559
}
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
459
561
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
462
564
goto globalfail;
463
565
}
464
566
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
568
467
569
return 0;
468
570
469
571
globalfail:
470
572
471
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
472
574
gnutls_global_deinit();
473
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
474
576
return -1;
475
577
}
476
578
477
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
478
582
int ret;
479
583
/* GnuTLS session creation */
480
584
do {
484
588
}
485
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
590
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
489
594
}
490
595
491
596
{
492
597
const char *err;
493
598
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
495
600
if(quit_now){
496
601
gnutls_deinit(*session);
497
602
return -1;
498
603
}
499
604
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
605
if(ret != GNUTLS_E_SUCCESS){
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
504
609
gnutls_deinit(*session);
505
610
return -1;
506
611
}
508
613
509
614
do {
510
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
616
mc->cred);
512
617
if(quit_now){
513
618
gnutls_deinit(*session);
514
619
return -1;
515
620
}
516
621
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
622
if(ret != GNUTLS_E_SUCCESS){
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
520
625
gnutls_deinit(*session);
521
626
return -1;
522
627
}
524
629
/* ignore client certificate if any. */
525
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
526
631
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
528
633
529
634
return 0;
530
635
}
534
639
__attribute__((unused)) const char *txt){}
535
640
536
641
/* Called when a Mandos server is found */
537
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
538
644
AvahiIfIndex if_index,
539
int af){
645
int af, mandos_context *mc){
540
646
int ret, tcp_sd = -1;
541
647
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
648
struct sockaddr_storage to;
546
649
char *buffer = NULL;
547
650
char *decrypted_buffer = NULL;
548
651
size_t buffer_length = 0;
552
655
gnutls_session_t session;
553
656
int pf; /* Protocol family */
554
657
658
errno = 0;
659
555
660
if(quit_now){
661
errno = EINTR;
556
662
return -1;
557
663
}
558
664
564
670
pf = PF_INET;
565
671
break;
566
672
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
674
errno = EINVAL;
568
675
return -1;
569
676
}
570
677
571
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
572
711
if(ret != 0){
573
712
return -1;
574
713
}
575
714
576
715
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
579
718
}
580
719
581
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
582
721
if(tcp_sd < 0){
583
perror("socket");
722
int e = errno;
723
perror_plus("socket");
724
errno = e;
584
725
goto mandos_end;
585
726
}
586
727
587
728
if(quit_now){
729
errno = EINTR;
588
730
goto mandos_end;
589
731
}
590
732
591
733
memset(&to, 0, sizeof(to));
592
734
if(af == AF_INET6){
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
595
737
} else { /* IPv4 */
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
598
740
}
599
741
if(ret < 0 ){
600
perror("inet_pton");
742
int e = errno;
743
perror_plus("inet_pton");
744
errno = e;
601
745
goto mandos_end;
602
746
}
603
747
if(ret == 0){
604
fprintf(stderr, "Bad address: %s\n", ip);
748
int e = errno;
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
750
errno = e;
605
751
goto mandos_end;
606
752
}
607
753
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
615
757
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
760
errno = EINVAL;
618
761
goto mandos_end;
619
762
}
620
763
/* Set the network interface number as scope */
621
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
622
765
}
623
766
} else {
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
627
768
}
628
769
629
770
if(quit_now){
771
errno = EINTR;
630
772
goto mandos_end;
631
773
}
632
774
634
776
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
777
char interface[IF_NAMESIZE];
636
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
779
perror_plus("if_indextoname");
638
780
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
641
783
}
642
784
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
645
787
}
646
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
649
790
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
652
795
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
655
800
}
656
if(pcret == NULL){
657
perror("inet_ntop");
658
} else {
659
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
661
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
662
807
}
663
808
}
664
809
665
810
if(quit_now){
811
errno = EINTR;
666
812
goto mandos_end;
667
813
}
668
814
669
815
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
671
818
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
673
821
}
674
822
if(ret < 0){
675
perror("connect");
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
int e = errno;
825
perror_plus("connect");
826
errno = e;
827
}
676
828
goto mandos_end;
677
829
}
678
830
679
831
if(quit_now){
832
errno = EINTR;
680
833
goto mandos_end;
681
834
}
682
835
685
838
while(true){
686
839
size_t out_size = strlen(out);
687
840
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
688
out_size - written));
841
out_size - written));
689
842
if(ret == -1){
690
perror("write");
843
int e = errno;
844
perror_plus("write");
845
errno = e;
691
846
goto mandos_end;
692
847
}
693
848
written += (size_t)ret;
703
858
}
704
859
705
860
if(quit_now){
861
errno = EINTR;
706
862
goto mandos_end;
707
863
}
708
864
}
709
865
710
866
if(debug){
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
868
}
713
869
714
870
if(quit_now){
871
errno = EINTR;
715
872
goto mandos_end;
716
873
}
717
874
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
719
880
720
881
if(quit_now){
882
errno = EINTR;
721
883
goto mandos_end;
722
884
}
723
885
724
886
do {
725
887
ret = gnutls_handshake(session);
726
888
if(quit_now){
889
errno = EINTR;
727
890
goto mandos_end;
728
891
}
729
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
893
731
894
if(ret != GNUTLS_E_SUCCESS){
732
895
if(debug){
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
897
gnutls_perror(ret);
735
898
}
899
errno = EPROTO;
736
900
goto mandos_end;
737
901
}
738
902
739
903
/* Read OpenPGP packet that contains the wanted password */
740
904
741
905
if(debug){
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
744
908
}
745
909
746
910
while(true){
747
911
748
912
if(quit_now){
913
errno = EINTR;
749
914
goto mandos_end;
750
915
}
751
916
752
917
buffer_capacity = incbuffer(&buffer, buffer_length,
753
buffer_capacity);
918
buffer_capacity);
754
919
if(buffer_capacity == 0){
755
perror("incbuffer");
920
int e = errno;
921
perror_plus("incbuffer");
922
errno = e;
756
923
goto mandos_end;
757
924
}
758
925
759
926
if(quit_now){
927
errno = EINTR;
760
928
goto mandos_end;
761
929
}
762
930
775
943
ret = gnutls_handshake(session);
776
944
777
945
if(quit_now){
946
errno = EINTR;
778
947
goto mandos_end;
779
948
}
780
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
781
950
if(ret < 0){
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
783
953
gnutls_perror(ret);
954
errno = EPROTO;
784
955
goto mandos_end;
785
956
}
786
957
break;
787
958
default:
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
790
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
962
errno = EIO;
791
963
goto mandos_end;
792
964
}
793
965
} else {
796
968
}
797
969
798
970
if(debug){
799
fprintf(stderr, "Closing TLS session\n");
971
fprintf_plus(stderr, "Closing TLS session\n");
800
972
}
801
973
802
974
if(quit_now){
975
errno = EINTR;
803
976
goto mandos_end;
804
977
}
805
978
806
979
do {
807
980
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
981
if(quit_now){
982
errno = EINTR;
809
983
goto mandos_end;
810
984
}
811
985
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
986
813
987
if(buffer_length > 0){
814
988
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
817
&decrypted_buffer);
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
818
991
if(decrypted_buffer_size >= 0){
819
992
820
993
written = 0;
821
994
while(written < (size_t) decrypted_buffer_size){
822
995
if(quit_now){
996
errno = EINTR;
823
997
goto mandos_end;
824
998
}
825
999
827
1001
(size_t)decrypted_buffer_size - written,
828
1002
stdout);
829
1003
if(ret == 0 and ferror(stdout)){
1004
int e = errno;
830
1005
if(debug){
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
833
1008
}
1009
errno = e;
834
1010
goto mandos_end;
835
1011
}
836
1012
written += (size_t)ret;
842
1018
/* Shutdown procedure */
843
1019
844
1020
mandos_end:
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
1021
{
1022
int e = errno;
1023
free(decrypted_buffer);
1024
free(buffer);
1025
if(tcp_sd >= 0){
1026
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1027
}
1028
if(ret == -1){
1029
if(e == 0){
1030
e = errno;
1031
}
1032
perror_plus("close");
1033
}
1034
gnutls_deinit(session);
1035
errno = e;
1036
if(quit_now){
1037
errno = EINTR;
1038
retval = -1;
1039
}
856
1040
}
857
1041
return retval;
858
1042
}
859
1043
1044
__attribute__((nonnull))
860
1045
static void resolve_callback(AvahiSServiceResolver *r,
861
1046
AvahiIfIndex interface,
862
1047
AvahiProtocol proto,
870
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
871
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
872
1057
flags,
873
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
875
1062
876
1063
/* Called whenever a service has been resolved successfully or
877
1064
timed out */
883
1070
switch(event){
884
1071
default:
885
1072
case AVAHI_RESOLVER_FAILURE:
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
889
1078
break;
890
1079
891
1080
case AVAHI_RESOLVER_FOUND:
893
1082
char ip[AVAHI_ADDRESS_STR_MAX];
894
1083
avahi_address_snprint(ip, sizeof(ip), address);
895
1084
if(debug){
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
899
1088
}
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
902
1093
if(ret == 0){
903
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1095
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
904
1102
}
905
1103
}
906
1104
}
916
1114
const char *domain,
917
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1116
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
921
1121
922
1122
/* Called whenever a new services becomes available on the LAN or
923
1123
is removed from the LAN */
930
1130
default:
931
1131
case AVAHI_BROWSER_FAILURE:
932
1132
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
936
1137
return;
937
1138
938
1139
case AVAHI_BROWSER_NEW:
941
1142
the callback function is called the Avahi server will free the
942
1143
resolver for us. */
943
1144
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
949
1153
break;
950
1154
951
1155
case AVAHI_BROWSER_REMOVE:
954
1158
case AVAHI_BROWSER_ALL_FOR_NOW:
955
1159
case AVAHI_BROWSER_CACHE_EXHAUSTED:
956
1160
if(debug){
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
958
1163
}
959
1164
break;
960
1165
}
961
1166
}
962
1167
963
/* stop main loop after sigterm has been called */
1168
/* Signal handler that stops main loop after SIGTERM */
964
1169
static void handle_sigterm(int sig){
965
1170
if(quit_now){
966
1171
return;
968
1173
quit_now = 1;
969
1174
signal_received = sig;
970
1175
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
1176
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1179
}
1180
errno = old_errno;
1181
}
1182
1183
__attribute__((nonnull, warn_unused_result))
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
int ret;
1186
error_t ret_errno;
1187
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
if(s < 0){
1190
ret_errno = errno;
1191
perror_plus("socket");
1192
errno = ret_errno;
1193
return false;
1194
}
1195
strcpy(ifr->ifr_name, ifname);
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
if(ret == -1){
1198
if(debug){
1199
ret_errno = errno;
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
}
1203
return false;
1204
}
1205
return true;
1206
}
1207
1208
__attribute__((nonnull, warn_unused_result))
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1211
/* Reject the loopback device */
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1213
if(debug){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1216
}
1217
return false;
1218
}
1219
/* Accept point-to-point devices only if connect_to is specified */
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1221
if(debug){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return true;
1226
}
1227
/* Otherwise, reject non-broadcast-capable devices */
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1232
}
1233
return false;
1234
}
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
if(ifr->ifr_flags & IFF_NOARP){
1237
if(debug){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1240
}
1241
return false;
1242
}
1243
1244
/* Accept this device */
1245
if(debug){
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1247
}
1248
return true;
1249
}
1250
1251
/*
1252
* This function determines if a directory entry in /sys/class/net
1253
* corresponds to an acceptable network device.
1254
* (This function is passed to scandir(3) as a filter function.)
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
int good_interface(const struct dirent *if_entry){
1258
if(if_entry->d_name[0] == '.'){
1259
return 0;
1260
}
1261
1262
struct ifreq ifr;
1263
if(not get_flags(if_entry->d_name, &ifr)){
1264
if(debug){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1312
int notdotentries(const struct dirent *direntry){
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
return 0;
1319
}
1320
return 1;
1321
}
1322
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
int runnable_hook(const struct dirent *direntry){
1326
int ret;
1327
size_t sret;
1328
struct stat st;
1329
1330
if((direntry->d_name)[0] == '\0'){
1331
/* Empty name? */
1332
return 0;
1333
}
1334
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1337
"0123456789"
1338
"_.-");
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1341
if(debug){
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1344
}
1345
return 0;
1346
}
1347
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1356
if(ret == -1){
1357
if(debug){
1358
perror_plus("Could not stat hook");
1359
}
1360
return 0;
1361
}
1362
free(fullname);
1363
if(not (S_ISREG(st.st_mode))){
1364
/* Not a regular file */
1365
if(debug){
1366
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1367
direntry->d_name);
1368
}
1369
return 0;
1370
}
1371
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1372
/* Not executable */
1373
if(debug){
1374
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1375
direntry->d_name);
1376
}
1377
return 0;
1378
}
1379
if(debug){
1380
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1381
direntry->d_name);
1382
}
1383
return 1;
1384
}
1385
1386
__attribute__((nonnull, warn_unused_result))
1387
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1388
mandos_context *mc){
1389
int ret;
1390
struct timespec now;
1391
struct timespec waited_time;
1392
intmax_t block_time;
1393
1394
while(true){
1395
if(mc->current_server == NULL){
1396
if(debug){
1397
fprintf_plus(stderr, "Wait until first server is found."
1398
" No timeout!\n");
1399
}
1400
ret = avahi_simple_poll_iterate(s, -1);
1401
} else {
1402
if(debug){
1403
fprintf_plus(stderr, "Check current_server if we should run"
1404
" it, or wait\n");
1405
}
1406
/* the current time */
1407
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1408
if(ret == -1){
1409
perror_plus("clock_gettime");
1410
return -1;
1411
}
1412
/* Calculating in ms how long time between now and server
1413
who we visted longest time ago. Now - last seen. */
1414
waited_time.tv_sec = (now.tv_sec
1415
- mc->current_server->last_seen.tv_sec);
1416
waited_time.tv_nsec = (now.tv_nsec
1417
- mc->current_server->last_seen.tv_nsec);
1418
/* total time is 10s/10,000ms.
1419
Converting to s from ms by dividing by 1,000,
1420
and ns to ms by dividing by 1,000,000. */
1421
block_time = ((retry_interval
1422
- ((intmax_t)waited_time.tv_sec * 1000))
1423
- ((intmax_t)waited_time.tv_nsec / 1000000));
1424
1425
if(debug){
1426
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1427
block_time);
1428
}
1429
1430
if(block_time <= 0){
1431
ret = start_mandos_communication(mc->current_server->ip,
1432
mc->current_server->port,
1433
mc->current_server->if_index,
1434
mc->current_server->af, mc);
1435
if(ret == 0){
1436
avahi_simple_poll_quit(s);
1437
return 0;
1438
}
1439
ret = clock_gettime(CLOCK_MONOTONIC,
1440
&mc->current_server->last_seen);
1441
if(ret == -1){
1442
perror_plus("clock_gettime");
1443
return -1;
1444
}
1445
mc->current_server = mc->current_server->next;
1446
block_time = 0; /* Call avahi to find new Mandos
1447
servers, but don't block */
1448
}
1449
1450
ret = avahi_simple_poll_iterate(s, (int)block_time);
1451
}
1452
if(ret != 0){
1453
if(ret > 0 or errno != EINTR){
1454
return (ret != 1) ? ret : 0;
1455
}
1456
}
1457
}
1458
}
1459
1460
/* Set effective uid to 0, return errno */
1461
__attribute__((warn_unused_result))
1462
error_t raise_privileges(void){
1463
error_t old_errno = errno;
1464
error_t ret_errno = 0;
1465
if(seteuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective and real user ID to 0. Return errno. */
1474
__attribute__((warn_unused_result))
1475
error_t raise_privileges_permanently(void){
1476
error_t old_errno = errno;
1477
error_t ret_errno = raise_privileges();
1478
if(ret_errno != 0){
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
if(setuid(0) == -1){
1483
ret_errno = errno;
1484
perror_plus("seteuid");
1485
}
1486
errno = old_errno;
1487
return ret_errno;
1488
}
1489
1490
/* Set effective user ID to unprivileged saved user ID */
1491
__attribute__((warn_unused_result))
1492
error_t lower_privileges(void){
1493
error_t old_errno = errno;
1494
error_t ret_errno = 0;
1495
if(seteuid(uid) == -1){
1496
ret_errno = errno;
1497
perror_plus("seteuid");
1498
}
1499
errno = old_errno;
1500
return ret_errno;
1501
}
1502
1503
/* Lower privileges permanently */
1504
__attribute__((warn_unused_result))
1505
error_t lower_privileges_permanently(void){
1506
error_t old_errno = errno;
1507
error_t ret_errno = 0;
1508
if(setuid(uid) == -1){
1509
ret_errno = errno;
1510
perror_plus("setuid");
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1518
const float delay){
1519
struct dirent **direntries;
1520
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1521
alphasort);
1522
if(numhooks == -1){
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("scandir");
1530
}
1531
} else {
1532
struct dirent *direntry;
1533
int ret;
1534
int devnull = open("/dev/null", O_RDONLY);
1535
for(int i = 0; i < numhooks; i++){
1536
direntry = direntries[i];
1537
char *fullname = NULL;
1538
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1539
if(ret < 0){
1540
perror_plus("asprintf");
1541
continue;
1542
}
1543
if(debug){
1544
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1545
direntry->d_name);
1546
}
1547
pid_t hook_pid = fork();
1548
if(hook_pid == 0){
1549
/* Child */
1550
/* Raise privileges */
1551
if(raise_privileges_permanently() != 0){
1552
perror_plus("Failed to raise privileges");
1553
_exit(EX_NOPERM);
1554
}
1555
/* Set group */
1556
errno = 0;
1557
ret = setgid(0);
1558
if(ret == -1){
1559
perror_plus("setgid");
1560
_exit(EX_NOPERM);
1561
}
1562
/* Reset supplementary groups */
1563
errno = 0;
1564
ret = setgroups(0, NULL);
1565
if(ret == -1){
1566
perror_plus("setgroups");
1567
_exit(EX_NOPERM);
1568
}
1569
ret = dup2(devnull, STDIN_FILENO);
1570
if(ret == -1){
1571
perror_plus("dup2(devnull, STDIN_FILENO)");
1572
_exit(EX_OSERR);
1573
}
1574
ret = close(devnull);
1575
if(ret == -1){
1576
perror_plus("close");
1577
_exit(EX_OSERR);
1578
}
1579
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
if(ret == -1){
1581
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1582
_exit(EX_OSERR);
1583
}
1584
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
if(ret == -1){
1586
perror_plus("setenv");
1587
_exit(EX_OSERR);
1588
}
1589
ret = setenv("DEVICE", interface, 1);
1590
if(ret == -1){
1591
perror_plus("setenv");
1592
_exit(EX_OSERR);
1593
}
1594
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1595
if(ret == -1){
1596
perror_plus("setenv");
1597
_exit(EX_OSERR);
1598
}
1599
ret = setenv("MODE", mode, 1);
1600
if(ret == -1){
1601
perror_plus("setenv");
1602
_exit(EX_OSERR);
1603
}
1604
char *delaystring;
1605
ret = asprintf(&delaystring, "%f", (double)delay);
1606
if(ret == -1){
1607
perror_plus("asprintf");
1608
_exit(EX_OSERR);
1609
}
1610
ret = setenv("DELAY", delaystring, 1);
1611
if(ret == -1){
1612
free(delaystring);
1613
perror_plus("setenv");
1614
_exit(EX_OSERR);
1615
}
1616
free(delaystring);
1617
if(connect_to != NULL){
1618
ret = setenv("CONNECT", connect_to, 1);
1619
if(ret == -1){
1620
perror_plus("setenv");
1621
_exit(EX_OSERR);
1622
}
1623
}
1624
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1625
perror_plus("execl");
1626
_exit(EXIT_FAILURE);
1627
}
1628
} else {
1629
int status;
1630
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1631
perror_plus("waitpid");
1632
free(fullname);
1633
continue;
1634
}
1635
if(WIFEXITED(status)){
1636
if(WEXITSTATUS(status) != 0){
1637
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1638
" with status %d\n", direntry->d_name,
1639
WEXITSTATUS(status));
1640
free(fullname);
1641
continue;
1642
}
1643
} else if(WIFSIGNALED(status)){
1644
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1645
" signal %d\n", direntry->d_name,
1646
WTERMSIG(status));
1647
free(fullname);
1648
continue;
1649
} else {
1650
fprintf_plus(stderr, "Warning: network hook \"%s\""
1651
" crashed\n", direntry->d_name);
1652
free(fullname);
1653
continue;
1654
}
1655
}
1656
free(fullname);
1657
if(debug){
1658
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1659
direntry->d_name);
1660
}
1661
}
1662
close(devnull);
1663
}
1664
}
1665
1666
__attribute__((nonnull, warn_unused_result))
1667
error_t bring_up_interface(const char *const interface,
1668
const float delay){
1669
error_t old_errno = errno;
1670
int ret;
1671
struct ifreq network;
1672
unsigned int if_index = if_nametoindex(interface);
1673
if(if_index == 0){
1674
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1675
errno = old_errno;
1676
return ENXIO;
1677
}
1678
1679
if(quit_now){
1680
errno = old_errno;
1681
return EINTR;
1682
}
1683
1684
if(not interface_is_up(interface)){
1685
error_t ret_errno = 0, ioctl_errno = 0;
1686
if(not get_flags(interface, &network)){
1687
ret_errno = errno;
1688
fprintf_plus(stderr, "Failed to get flags for interface "
1689
"\"%s\"\n", interface);
1690
errno = old_errno;
1691
return ret_errno;
1692
}
1693
network.ifr_flags |= IFF_UP; /* set flag */
1694
1695
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1696
if(sd == -1){
1697
ret_errno = errno;
1698
perror_plus("socket");
1699
errno = old_errno;
1700
return ret_errno;
1701
}
1702
1703
if(quit_now){
1704
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
if(ret == -1){
1706
perror_plus("close");
1707
}
1708
errno = old_errno;
1709
return EINTR;
1710
}
1711
1712
if(debug){
1713
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1714
interface);
1715
}
1716
1717
/* Raise privileges */
1718
ret_errno = raise_privileges();
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
1723
#ifdef __linux__
1724
int ret_linux;
1725
bool restore_loglevel = false;
1726
if(ret_errno == 0){
1727
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1728
messages about the network interface to mess up the prompt */
1729
ret_linux = klogctl(8, NULL, 5);
1730
if(ret_linux == -1){
1731
perror_plus("klogctl");
1732
} else {
1733
restore_loglevel = true;
1734
}
1735
}
1736
#endif /* __linux__ */
1737
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1738
ioctl_errno = errno;
1739
#ifdef __linux__
1740
if(restore_loglevel){
1741
ret_linux = klogctl(7, NULL, 0);
1742
if(ret_linux == -1){
1743
perror_plus("klogctl");
1744
}
1745
}
1746
#endif /* __linux__ */
1747
1748
/* If raise_privileges() succeeded above */
1749
if(ret_errno == 0){
1750
/* Lower privileges */
1751
ret_errno = lower_privileges();
1752
if(ret_errno != 0){
1753
errno = ret_errno;
1754
perror_plus("Failed to lower privileges");
1755
}
1756
}
1757
1758
/* Close the socket */
1759
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1760
if(ret == -1){
1761
perror_plus("close");
1762
}
1763
1764
if(ret_setflags == -1){
1765
errno = ioctl_errno;
1766
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1767
errno = old_errno;
1768
return ioctl_errno;
1769
}
1770
} else if(debug){
1771
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1772
interface);
1773
}
1774
1775
/* Sleep checking until interface is running.
1776
Check every 0.25s, up to total time of delay */
1777
for(int i=0; i < delay * 4; i++){
1778
if(interface_is_running(interface)){
1779
break;
1780
}
1781
struct timespec sleeptime = { .tv_nsec = 250000000 };
1782
ret = nanosleep(&sleeptime, NULL);
1783
if(ret == -1 and errno != EINTR){
1784
perror_plus("nanosleep");
1785
}
1786
}
1787
1788
errno = old_errno;
1789
return 0;
1790
}
1791
1792
__attribute__((nonnull, warn_unused_result))
1793
error_t take_down_interface(const char *const interface){
1794
error_t old_errno = errno;
1795
struct ifreq network;
1796
unsigned int if_index = if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1799
errno = old_errno;
1800
return ENXIO;
1801
}
1802
if(interface_is_up(interface)){
1803
error_t ret_errno = 0, ioctl_errno = 0;
1804
if(not get_flags(interface, &network) and debug){
1805
ret_errno = errno;
1806
fprintf_plus(stderr, "Failed to get flags for interface "
1807
"\"%s\"\n", interface);
1808
errno = old_errno;
1809
return ret_errno;
1810
}
1811
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1812
1813
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1814
if(sd == -1){
1815
ret_errno = errno;
1816
perror_plus("socket");
1817
errno = old_errno;
1818
return ret_errno;
1819
}
1820
1821
if(debug){
1822
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1823
interface);
1824
}
1825
1826
/* Raise privileges */
1827
ret_errno = raise_privileges();
1828
if(ret_errno != 0){
1829
perror_plus("Failed to raise privileges");
1830
}
1831
1832
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1833
ioctl_errno = errno;
1834
1835
/* If raise_privileges() succeeded above */
1836
if(ret_errno == 0){
1837
/* Lower privileges */
1838
ret_errno = lower_privileges();
1839
if(ret_errno != 0){
1840
errno = ret_errno;
1841
perror_plus("Failed to lower privileges");
1842
}
1843
}
1844
1845
/* Close the socket */
1846
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1847
if(ret == -1){
1848
perror_plus("close");
1849
}
1850
1851
if(ret_setflags == -1){
1852
errno = ioctl_errno;
1853
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1854
errno = old_errno;
1855
return ioctl_errno;
1856
}
1857
} else if(debug){
1858
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1859
interface);
1860
}
1861
1862
errno = old_errno;
1863
return 0;
975
1864
}
976
1865
977
1866
int main(int argc, char *argv[]){
1867
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1868
.priority = "SECURE256:!CTYPE-X.509:"
1869
"+CTYPE-OPENPGP", .current_server = NULL,
1870
.interfaces = NULL, .interfaces_size = 0 };
978
1871
AvahiSServiceBrowser *sb = NULL;
979
int error;
1872
error_t ret_errno;
980
1873
int ret;
981
1874
intmax_t tmpmax;
982
1875
char *tmp;
983
1876
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
1877
char *interfaces_to_take_down = NULL;
1878
size_t interfaces_to_take_down_size = 0;
1879
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1880
char old_tempdir[] = "/tmp/mandosXXXXXX";
1881
char *tempdir = NULL;
993
1882
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
1883
const char *seckey = PATHDIR "/" SECKEY;
995
1884
const char *pubkey = PATHDIR "/" PUBKEY;
1885
char *interfaces_hooks = NULL;
996
1886
997
1887
bool gnutls_initialized = false;
998
1888
bool gpgme_initialized = false;
999
1889
float delay = 2.5f;
1890
double retry_interval = 10; /* 10s between trying a server and
1891
retrying the same server again */
1000
1892
1001
1893
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
1894
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1008
1900
errno = 0;
1009
1901
ret = setgid(gid);
1010
1902
if(ret == -1){
1011
perror("setgid");
1903
perror_plus("setgid");
1012
1904
}
1013
1905
1014
1906
/* Lower user privileges (temporarily) */
1015
1907
errno = 0;
1016
1908
ret = seteuid(uid);
1017
1909
if(ret == -1){
1018
perror("seteuid");
1910
perror_plus("seteuid");
1019
1911
}
1020
1912
1021
1913
if(quit_now){
1056
1948
.arg = "SECONDS",
1057
1949
.doc = "Maximum delay to wait for interface startup",
1058
1950
.group = 2 },
1951
{ .name = "retry", .key = 132,
1952
.arg = "SECONDS",
1953
.doc = "Retry interval used when denied by the Mandos server",
1954
.group = 2 },
1955
{ .name = "network-hook-dir", .key = 133,
1956
.arg = "DIR",
1957
.doc = "Directory where network hooks are located",
1958
.group = 2 },
1959
/*
1960
* These reproduce what we would get without ARGP_NO_HELP
1961
*/
1962
{ .name = "help", .key = '?',
1963
.doc = "Give this help list", .group = -1 },
1964
{ .name = "usage", .key = -3,
1965
.doc = "Give a short usage message", .group = -1 },
1966
{ .name = "version", .key = 'V',
1967
.doc = "Print program version", .group = -1 },
1059
1968
{ .name = NULL }
1060
1969
};
1061
1970
1062
1971
error_t parse_opt(int key, char *arg,
1063
1972
struct argp_state *state){
1973
errno = 0;
1064
1974
switch(key){
1065
1975
case 128: /* --debug */
1066
1976
debug = true;
1069
1979
connect_to = arg;
1070
1980
break;
1071
1981
case 'i': /* --interface */
1072
interface = arg;
1982
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1983
arg, (int)',');
1984
if(ret_errno != 0){
1985
argp_error(state, "%s", strerror(ret_errno));
1986
}
1073
1987
break;
1074
1988
case 's': /* --seckey */
1075
1989
seckey = arg;
1082
1996
tmpmax = strtoimax(arg, &tmp, 10);
1083
1997
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
1998
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1999
argp_error(state, "Bad number of DH bits");
1087
2000
}
1088
2001
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
2002
break;
1094
2007
errno = 0;
1095
2008
delay = strtof(arg, &tmp);
1096
2009
if(errno != 0 or tmp == arg or *tmp != '\0'){
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
2010
argp_error(state, "Bad delay");
2011
}
2012
case 132: /* --retry */
2013
errno = 0;
2014
retry_interval = strtod(arg, &tmp);
2015
if(errno != 0 or tmp == arg or *tmp != '\0'
2016
or (retry_interval * 1000) > INT_MAX
2017
or retry_interval < 0){
2018
argp_error(state, "Bad retry interval");
2019
}
2020
break;
2021
case 133: /* --network-hook-dir */
2022
hookdir = arg;
2023
break;
2024
/*
2025
* These reproduce what we would get without ARGP_NO_HELP
2026
*/
2027
case '?': /* --help */
2028
argp_state_help(state, state->out_stream,
2029
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2030
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2031
case -3: /* --usage */
2032
argp_state_help(state, state->out_stream,
2033
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2034
case 'V': /* --version */
2035
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2036
exit(argp_err_exit_status);
1104
2037
break;
1105
2038
default:
1106
2039
return ARGP_ERR_UNKNOWN;
1107
2040
}
1108
return 0;
2041
return errno;
1109
2042
}
1110
2043
1111
2044
struct argp argp = { .options = options, .parser = parse_opt,
1112
2045
.args_doc = "",
1113
2046
.doc = "Mandos client -- Get and decrypt"
1114
2047
" passwords from a Mandos server" };
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
2048
ret = argp_parse(&argp, argc, argv,
2049
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2050
switch(ret){
2051
case 0:
2052
break;
2053
case ENOMEM:
2054
default:
2055
errno = ret;
2056
perror_plus("argp_parse");
2057
exitcode = EX_OSERR;
2058
goto end;
2059
case EINVAL:
2060
exitcode = EX_USAGE;
2061
goto end;
2062
}
2063
}
2064
2065
{
2066
/* Work around Debian bug #633582:
2067
<http://bugs.debian.org/633582> */
2068
2069
/* Re-raise privileges */
2070
ret_errno = raise_privileges();
2071
if(ret_errno != 0){
2072
errno = ret_errno;
2073
perror_plus("Failed to raise privileges");
2074
} else {
2075
struct stat st;
2076
2077
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2078
int seckey_fd = open(seckey, O_RDONLY);
2079
if(seckey_fd == -1){
2080
perror_plus("open");
2081
} else {
2082
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2083
if(ret == -1){
2084
perror_plus("fstat");
2085
} else {
2086
if(S_ISREG(st.st_mode)
2087
and st.st_uid == 0 and st.st_gid == 0){
2088
ret = fchown(seckey_fd, uid, gid);
2089
if(ret == -1){
2090
perror_plus("fchown");
2091
}
2092
}
2093
}
2094
TEMP_FAILURE_RETRY(close(seckey_fd));
2095
}
2096
}
2097
2098
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2099
int pubkey_fd = open(pubkey, O_RDONLY);
2100
if(pubkey_fd == -1){
2101
perror_plus("open");
2102
} else {
2103
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2104
if(ret == -1){
2105
perror_plus("fstat");
2106
} else {
2107
if(S_ISREG(st.st_mode)
2108
and st.st_uid == 0 and st.st_gid == 0){
2109
ret = fchown(pubkey_fd, uid, gid);
2110
if(ret == -1){
2111
perror_plus("fchown");
2112
}
2113
}
2114
}
2115
TEMP_FAILURE_RETRY(close(pubkey_fd));
2116
}
2117
}
2118
2119
/* Lower privileges */
2120
ret_errno = lower_privileges();
2121
if(ret_errno != 0){
2122
errno = ret_errno;
2123
perror_plus("Failed to lower privileges");
2124
}
2125
}
2126
}
2127
2128
/* Remove invalid interface names (except "none") */
2129
{
2130
char *interface = NULL;
2131
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2132
interface))){
2133
if(strcmp(interface, "none") != 0
2134
and if_nametoindex(interface) == 0){
2135
if(interface[0] != '\0'){
2136
fprintf_plus(stderr, "Not using nonexisting interface"
2137
" \"%s\"\n", interface);
2138
}
2139
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2140
interface = NULL;
2141
}
2142
}
2143
}
2144
2145
/* Run network hooks */
2146
{
2147
if(mc.interfaces != NULL){
2148
interfaces_hooks = malloc(mc.interfaces_size);
2149
if(interfaces_hooks == NULL){
2150
perror_plus("malloc");
2151
goto end;
2152
}
2153
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2154
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2155
}
2156
run_network_hooks("start", interfaces_hooks != NULL ?
2157
interfaces_hooks : "", delay);
1121
2158
}
1122
2159
1123
2160
if(not debug){
1128
2165
from the signal handler */
1129
2166
/* Initialize the pseudo-RNG for Avahi */
1130
2167
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2168
simple_poll = avahi_simple_poll_new();
2169
if(simple_poll == NULL){
2170
fprintf_plus(stderr,
2171
"Avahi: Failed to create simple poll object.\n");
2172
exitcode = EX_UNAVAILABLE;
1135
2173
goto end;
1136
2174
}
1137
2175
1138
2176
sigemptyset(&sigterm_action.sa_mask);
1139
2177
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
2178
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2179
perror_plus("sigaddset");
2180
exitcode = EX_OSERR;
1143
2181
goto end;
1144
2182
}
1145
2183
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
2184
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2185
perror_plus("sigaddset");
2186
exitcode = EX_OSERR;
1149
2187
goto end;
1150
2188
}
1151
2189
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
2190
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2191
perror_plus("sigaddset");
2192
exitcode = EX_OSERR;
1155
2193
goto end;
1156
2194
}
1157
2195
/* Need to check if the handler is SIG_IGN before handling:
1160
2198
*/
1161
2199
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
2200
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2201
perror_plus("sigaction");
2202
return EX_OSERR;
1165
2203
}
1166
2204
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
2205
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
2206
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2207
perror_plus("sigaction");
2208
exitcode = EX_OSERR;
1171
2209
goto end;
1172
2210
}
1173
2211
}
1174
2212
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
2213
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2214
perror_plus("sigaction");
2215
return EX_OSERR;
1178
2216
}
1179
2217
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
2218
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
2219
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2220
perror_plus("sigaction");
2221
exitcode = EX_OSERR;
1184
2222
goto end;
1185
2223
}
1186
2224
}
1187
2225
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
2226
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2227
perror_plus("sigaction");
2228
return EX_OSERR;
1191
2229
}
1192
2230
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
2231
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
2232
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
2233
perror_plus("sigaction");
2234
exitcode = EX_OSERR;
2235
goto end;
2236
}
2237
}
2238
2239
/* If no interfaces were specified, make a list */
2240
if(mc.interfaces == NULL){
2241
struct dirent **direntries;
2242
/* Look for any good interfaces */
2243
ret = scandir(sys_class_net, &direntries, good_interface,
2244
alphasort);
2245
if(ret >= 1){
2246
/* Add all found interfaces to interfaces list */
2247
for(int i = 0; i < ret; ++i){
2248
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2249
direntries[i]->d_name);
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("argz_add");
2253
continue;
2254
}
2255
if(debug){
2256
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2257
direntries[i]->d_name);
2258
}
2259
}
2260
free(direntries);
2261
} else {
2262
free(direntries);
2263
fprintf_plus(stderr, "Could not find a network interface\n");
2264
exitcode = EXIT_FAILURE;
2265
goto end;
2266
}
2267
}
2268
2269
/* Bring up interfaces which are down, and remove any "none"s */
2270
{
2271
char *interface = NULL;
2272
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2273
interface))){
2274
/* If interface name is "none", stop bringing up interfaces.
2275
Also remove all instances of "none" from the list */
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
while((interface = argz_next(mc.interfaces,
2281
mc.interfaces_size, interface))){
2282
if(strcmp(interface, "none") == 0){
2283
argz_delete(&mc.interfaces, &mc.interfaces_size,
2284
interface);
2285
interface = NULL;
1286
2286
}
1287
2287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
2288
break;
1305
2289
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
2290
bool interface_was_up = interface_is_up(interface);
2291
errno = bring_up_interface(interface, delay);
2292
if(not interface_was_up){
2293
if(errno != 0){
2294
perror_plus("Failed to bring up interface");
2295
} else {
2296
errno = argz_add(&interfaces_to_take_down,
2297
&interfaces_to_take_down_size,
2298
interface);
2299
if(errno != 0){
2300
perror_plus("argz_add");
2301
}
2302
}
2303
}
2304
}
2305
if(debug and (interfaces_to_take_down == NULL)){
2306
fprintf_plus(stderr, "No interfaces were brought up\n");
2307
}
2308
}
2309
2310
/* If we only got one interface, explicitly use only that one */
2311
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2312
if(debug){
2313
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2314
mc.interfaces);
2315
}
2316
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1343
2317
}
1344
2318
1345
2319
if(quit_now){
1346
2320
goto end;
1347
2321
}
1348
2322
1349
ret = init_gnutls_global(pubkey, seckey);
2323
ret = init_gnutls_global(pubkey, seckey, &mc);
1350
2324
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2325
fprintf_plus(stderr, "init_gnutls_global failed\n");
2326
exitcode = EX_UNAVAILABLE;
1353
2327
goto end;
1354
2328
} else {
1355
2329
gnutls_initialized = true;
1359
2333
goto end;
1360
2334
}
1361
2335
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
2336
/* Try /run/tmp before /tmp */
2337
tempdir = mkdtemp(run_tempdir);
2338
if(tempdir == NULL and errno == ENOENT){
2339
if(debug){
2340
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2341
run_tempdir, old_tempdir);
2342
}
2343
tempdir = mkdtemp(old_tempdir);
2344
}
2345
if(tempdir == NULL){
2346
perror_plus("mkdtemp");
1366
2347
goto end;
1367
2348
}
1368
2349
1370
2351
goto end;
1371
2352
}
1372
2353
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2354
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2355
fprintf_plus(stderr, "init_gpgme failed\n");
2356
exitcode = EX_UNAVAILABLE;
1376
2357
goto end;
1377
2358
} else {
1378
2359
gpgme_initialized = true;
1386
2367
/* Connect directly, do not use Zeroconf */
1387
2368
/* (Mainly meant for debugging) */
1388
2369
char *address = strrchr(connect_to, ':');
2370
1389
2371
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2372
fprintf_plus(stderr, "No colon in address\n");
2373
exitcode = EX_USAGE;
1392
2374
goto end;
1393
2375
}
1394
2376
1396
2378
goto end;
1397
2379
}
1398
2380
1399
uint16_t port;
2381
in_port_t port;
1400
2382
errno = 0;
1401
2383
tmpmax = strtoimax(address+1, &tmp, 10);
1402
2384
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2385
or tmpmax != (in_port_t)tmpmax){
2386
fprintf_plus(stderr, "Bad port number\n");
2387
exitcode = EX_USAGE;
1406
2388
goto end;
1407
2389
}
1408
2390
1409
2391
if(quit_now){
1410
2392
goto end;
1411
2393
}
1412
2394
1413
port = (uint16_t)tmpmax;
2395
port = (in_port_t)tmpmax;
1414
2396
*address = '\0';
1415
address = connect_to;
1416
2397
/* Colon in address indicates IPv6 */
1417
2398
int af;
1418
if(strchr(address, ':') != NULL){
2399
if(strchr(connect_to, ':') != NULL){
1419
2400
af = AF_INET6;
2401
/* Accept [] around IPv6 address - see RFC 5952 */
2402
if(connect_to[0] == '[' and address[-1] == ']')
2403
{
2404
connect_to++;
2405
address[-1] = '\0';
2406
}
1420
2407
} else {
1421
2408
af = AF_INET;
1422
2409
}
2410
address = connect_to;
1423
2411
1424
2412
if(quit_now){
1425
2413
goto end;
1426
2414
}
1427
2415
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2416
while(not quit_now){
2417
ret = start_mandos_communication(address, port, if_index, af,
2418
&mc);
2419
if(quit_now or ret == 0){
2420
break;
2421
}
2422
if(debug){
2423
fprintf_plus(stderr, "Retrying in %d seconds\n",
2424
(int)retry_interval);
2425
}
2426
sleep((unsigned int)retry_interval);
2427
}
2428
2429
if(not quit_now){
1432
2430
exitcode = EXIT_SUCCESS;
1433
2431
}
2432
1434
2433
goto end;
1435
2434
}
1436
2435
1448
2447
config.publish_domain = 0;
1449
2448
1450
2449
/* Allocate a new server */
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2450
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2451
&config, NULL, NULL, &ret_errno);
1454
2452
1455
2453
/* Free the Avahi configuration data */
1456
2454
avahi_server_config_free(&config);
1458
2456
1459
2457
/* Check if creating the Avahi server object succeeded */
1460
2458
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2459
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2460
avahi_strerror(ret_errno));
2461
exitcode = EX_UNAVAILABLE;
1464
2462
goto end;
1465
2463
}
1466
2464
1471
2469
/* Create the Avahi service browser */
1472
2470
sb = avahi_s_service_browser_new(mc.server, if_index,
1473
2471
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
2472
NULL, 0, browse_callback,
2473
(void *)&mc);
1475
2474
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2475
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2476
avahi_strerror(avahi_server_errno(mc.server)));
2477
exitcode = EX_UNAVAILABLE;
1479
2478
goto end;
1480
2479
}
1481
2480
1486
2485
/* Run the main loop */
1487
2486
1488
2487
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
2488
fprintf_plus(stderr, "Starting Avahi loop search\n");
1490
2489
}
1491
2490
1492
avahi_simple_poll_loop(mc.simple_poll);
2491
ret = avahi_loop_with_timeout(simple_poll,
2492
(int)(retry_interval * 1000), &mc);
2493
if(debug){
2494
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2495
(ret == 0) ? "successfully" : "with error");
2496
}
1493
2497
1494
2498
end:
1495
2499
1496
2500
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2501
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1498
2502
}
1499
2503
1500
2504
/* Cleanup things */
2505
free(mc.interfaces);
2506
1501
2507
if(sb != NULL)
1502
2508
avahi_s_service_browser_free(sb);
1503
2509
1504
2510
if(mc.server != NULL)
1505
2511
avahi_server_free(mc.server);
1506
2512
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
2513
if(simple_poll != NULL)
2514
avahi_simple_poll_free(simple_poll);
1509
2515
1510
2516
if(gnutls_initialized){
1511
2517
gnutls_certificate_free_credentials(mc.cred);
1517
2523
gpgme_release(mc.ctx);
1518
2524
}
1519
2525
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
2526
/* Cleans up the circular linked list of Mandos servers the client
2527
has seen */
2528
if(mc.current_server != NULL){
2529
mc.current_server->prev->next = NULL;
2530
while(mc.current_server != NULL){
2531
server *next = mc.current_server->next;
2532
free(mc.current_server);
2533
mc.current_server = next;
1549
2534
}
1550
2535
}
1551
2536
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
2537
/* Re-raise privileges */
2538
{
2539
ret_errno = raise_privileges();
2540
if(ret_errno != 0){
2541
perror_plus("Failed to raise privileges");
1561
2542
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
2543
2544
/* Run network hooks */
2545
run_network_hooks("stop", interfaces_hooks != NULL ?
2546
interfaces_hooks : "", delay);
2547
2548
/* Take down the network interfaces which were brought up */
2549
{
2550
char *interface = NULL;
2551
while((interface=argz_next(interfaces_to_take_down,
2552
interfaces_to_take_down_size,
2553
interface))){
2554
ret_errno = take_down_interface(interface);
2555
if(ret_errno != 0){
2556
errno = ret_errno;
2557
perror_plus("Failed to take down interface");
2558
}
2559
}
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces needed to be taken"
2562
" down\n");
2563
}
2564
}
2565
}
2566
2567
ret_errno = lower_privileges_permanently();
2568
if(ret_errno != 0){
2569
perror_plus("Failed to lower privileges permanently");
2570
}
2571
}
2572
2573
free(interfaces_to_take_down);
2574
free(interfaces_hooks);
2575
2576
/* Removes the GPGME temp directory and all files inside */
2577
if(tempdir != NULL){
2578
struct dirent **direntries = NULL;
2579
struct dirent *direntry = NULL;
2580
int numentries = scandir(tempdir, &direntries, notdotentries,
2581
alphasort);
2582
if(numentries > 0){
2583
for(int i = 0; i < numentries; i++){
2584
direntry = direntries[i];
1574
2585
char *fullname = NULL;
1575
2586
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
2587
direntry->d_name);
1577
2588
if(ret < 0){
1578
perror("asprintf");
2589
perror_plus("asprintf");
1579
2590
continue;
1580
2591
}
1581
2592
ret = remove(fullname);
1582
2593
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
2594
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2595
strerror(errno));
1585
2596
}
1586
2597
free(fullname);
1587
2598
}
1588
closedir(d);
2599
}
2600
2601
/* need to clean even if 0 because man page doesn't specify */
2602
free(direntries);
2603
if(numentries == -1){
2604
perror_plus("scandir");
1589
2605
}
1590
2606
ret = rmdir(tempdir);
1591
2607
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
2608
perror_plus("rmdir");
1593
2609
}
1594
2610
}
1595
2611
1600
2616
&old_sigterm_action,
1601
2617
NULL));
1602
2618
if(ret == -1){
1603
perror("sigaction");
2619
perror_plus("sigaction");
1604
2620
}
1605
2621
do {
1606
2622
ret = raise(signal_received);
1607
2623
} while(ret != 0 and errno == EINTR);
1608
2624
if(ret != 0){
1609
perror("raise");
2625
perror_plus("raise");
1610
2626
abort();
1611
2627
}
1612
2628
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0