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- Committer: Björn Påhlsson
- Date: 2009-09-07 23:50:12 UTC
- mfrom: (363 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 415.
- Revision ID: belorn@braxen-20090907235012-nv0phcej18xq52qv
merge
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
85
98
86
#ifdef __linux__
99
87
#include <sys/klog.h> /* klogctl() */
117
105
init_gnutls_session(),
118
106
GNUTLS_* */
119
107
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
122
110
123
111
/* GPGME */
124
112
#include <gpgme.h> /* All GPGME types, constants and
132
120
#define PATHDIR "/conf/conf.d/mandos"
133
121
#define SECKEY "seckey.txt"
134
122
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
123
137
124
bool debug = false;
138
125
static const char mandos_protocol_version[] = "1";
139
126
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
147
148
/* Doubly linked list that need to be circularly linked when used */
149
typedef struct server{
150
const char *ip;
151
in_port_t port;
152
AvahiIfIndex if_index;
153
int af;
154
struct timespec last_seen;
155
struct server *next;
156
struct server *prev;
157
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
158
128
159
129
/* Used for passing in values through the Avahi callback functions */
160
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
161
132
AvahiServer *server;
162
133
gnutls_certificate_credentials_t cred;
163
134
unsigned int dh_bits;
164
135
gnutls_dh_params_t dh_params;
165
136
const char *priority;
166
137
gpgme_ctx_t ctx;
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
170
138
} mandos_context;
171
139
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
174
175
sig_atomic_t quit_now = 0;
176
int signal_received = 0;
177
178
/* Function to use when printing errors */
179
void perror_plus(const char *print_text){
180
int e = errno;
181
fprintf(stderr, "Mandos plugin %s: ",
182
program_invocation_short_name);
183
errno = e;
184
perror(print_text);
185
}
186
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_list ap;
190
va_start (ap, format);
191
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
}
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" };
196
144
197
145
/*
198
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
147
* bytes. "buffer_capacity" is how much is currently allocated,
200
148
* "buffer_length" is how much is already used.
201
149
*/
202
__attribute__((nonnull, warn_unused_result))
203
150
size_t incbuffer(char **buffer, size_t buffer_length,
204
size_t buffer_capacity){
151
size_t buffer_capacity){
205
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
212
155
return 0;
213
156
}
214
*buffer = new_buf;
215
157
buffer_capacity += BUFFER_SIZE;
216
158
}
217
159
return buffer_capacity;
218
160
}
219
161
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
224
int ret;
225
server *new_server = malloc(sizeof(server));
226
if(new_server == NULL){
227
perror_plus("malloc");
228
return false;
229
}
230
*new_server = (server){ .ip = strdup(ip),
231
.port = port,
232
.if_index = if_index,
233
.af = af };
234
if(new_server->ip == NULL){
235
perror_plus("strdup");
236
return false;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
/* Special case of first server */
244
if(*current_server == NULL){
245
new_server->next = new_server;
246
new_server->prev = new_server;
247
*current_server = new_server;
248
} else {
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
252
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
254
}
255
return true;
256
}
257
258
162
/*
259
163
* Initialize GPGME.
260
164
*/
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
266
167
gpgme_error_t rc;
267
168
gpgme_engine_info_t engine_info;
268
169
170
269
171
/*
270
172
* Helper function to insert pub and seckey to the engine keyring.
271
173
*/
272
bool import_key(const char * const filename){
174
bool import_key(const char *filename){
273
175
int ret;
274
176
int fd;
275
177
gpgme_data_t pgp_data;
276
178
277
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
278
180
if(fd == -1){
279
perror_plus("open");
181
perror("open");
280
182
return false;
281
183
}
282
184
283
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
284
186
if(rc != GPG_ERR_NO_ERROR){
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
287
189
return false;
288
190
}
289
191
290
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
291
193
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
294
196
return false;
295
197
}
296
198
297
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
298
200
if(ret == -1){
299
perror_plus("close");
201
perror("close");
300
202
}
301
203
gpgme_data_release(pgp_data);
302
204
return true;
303
205
}
304
206
305
207
if(debug){
306
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
307
209
}
308
210
309
211
/* Init GPGME */
310
212
gpgme_check_version(NULL);
311
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
312
214
if(rc != GPG_ERR_NO_ERROR){
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
315
217
return false;
316
218
}
317
219
318
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
319
221
rc = gpgme_get_engine_info(&engine_info);
320
222
if(rc != GPG_ERR_NO_ERROR){
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
323
225
return false;
324
226
}
325
227
while(engine_info != NULL){
331
233
engine_info = engine_info->next;
332
234
}
333
235
if(engine_info == NULL){
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
336
237
return false;
337
238
}
338
239
339
240
/* Create new GPGME "context" */
340
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
341
242
if(rc != GPG_ERR_NO_ERROR){
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
345
245
return false;
346
246
}
347
247
356
256
* Decrypt OpenPGP data.
357
257
* Returns -1 on error
358
258
*/
359
__attribute__((nonnull, warn_unused_result))
360
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
361
260
size_t crypto_size,
362
char **plaintext,
363
mandos_context *mc){
261
char **plaintext){
364
262
gpgme_data_t dh_crypto, dh_plain;
365
263
gpgme_error_t rc;
366
264
ssize_t ret;
368
266
ssize_t plaintext_length = 0;
369
267
370
268
if(debug){
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
372
270
}
373
271
374
272
/* Create new GPGME data buffer from memory cryptotext */
375
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
376
274
0);
377
275
if(rc != GPG_ERR_NO_ERROR){
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
380
278
return -1;
381
279
}
382
280
383
281
/* Create new empty GPGME data buffer for the plaintext */
384
282
rc = gpgme_data_new(&dh_plain);
385
283
if(rc != GPG_ERR_NO_ERROR){
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
389
286
gpgme_data_release(dh_crypto);
390
287
return -1;
391
288
}
392
289
393
290
/* Decrypt data from the cryptotext data buffer to the plaintext
394
291
data buffer */
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
293
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
399
296
plaintext_length = -1;
400
297
if(debug){
401
298
gpgme_decrypt_result_t result;
402
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
403
300
if(result == NULL){
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
405
302
} else {
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
410
307
if(result->file_name != NULL){
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
412
309
}
413
310
gpgme_recipient_t recipient;
414
311
recipient = result->recipients;
415
312
while(recipient != NULL){
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
423
319
recipient = recipient->next;
424
320
}
425
321
}
428
324
}
429
325
430
326
if(debug){
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
432
328
}
433
329
434
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
435
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
436
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
437
333
plaintext_length = -1;
438
334
goto decrypt_end;
439
335
}
441
337
*plaintext = NULL;
442
338
while(true){
443
339
plaintext_capacity = incbuffer(plaintext,
444
(size_t)plaintext_length,
445
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
446
342
if(plaintext_capacity == 0){
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
450
346
}
451
347
452
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
457
353
break;
458
354
}
459
355
if(ret < 0){
460
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
461
357
plaintext_length = -1;
462
358
goto decrypt_end;
463
359
}
465
361
}
466
362
467
363
if(debug){
468
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
469
365
for(ssize_t i = 0; i < plaintext_length; i++){
470
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
471
367
}
482
378
return plaintext_length;
483
379
}
484
380
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
488
384
if(ret == NULL)
489
385
ret = "(unknown)";
490
386
return ret;
491
387
}
492
388
493
389
/* GnuTLS log function callback */
494
__attribute__((nonnull))
495
390
static void debuggnutls(__attribute__((unused)) int level,
496
391
const char* string){
497
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
498
393
}
499
394
500
__attribute__((nonnull, warn_unused_result))
501
395
static int init_gnutls_global(const char *pubkeyfilename,
502
const char *seckeyfilename,
503
mandos_context *mc){
396
const char *seckeyfilename){
504
397
int ret;
505
398
506
399
if(debug){
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
508
401
}
509
402
510
403
ret = gnutls_global_init();
511
404
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
514
407
return -1;
515
408
}
516
409
523
416
}
524
417
525
418
/* OpenPGP credentials */
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
527
420
if(ret != GNUTLS_E_SUCCESS){
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
530
426
gnutls_global_deinit();
531
427
return -1;
532
428
}
533
429
534
430
if(debug){
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
539
434
}
540
435
541
436
ret = gnutls_certificate_set_openpgp_key_file
542
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
543
438
GNUTLS_OPENPGP_FMT_BASE64);
544
439
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr,
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
550
445
goto globalfail;
551
446
}
552
447
553
448
/* GnuTLS server initialization */
554
ret = gnutls_dh_params_init(&mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
555
450
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
559
453
goto globalfail;
560
454
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
456
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
565
459
goto globalfail;
566
460
}
567
461
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
463
570
464
return 0;
571
465
572
466
globalfail:
573
467
574
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
575
469
gnutls_global_deinit();
576
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
577
471
return -1;
578
472
}
579
473
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
474
static int init_gnutls_session(gnutls_session_t *session){
583
475
int ret;
584
476
/* GnuTLS session creation */
585
do {
586
ret = gnutls_init(session, GNUTLS_SERVER);
587
if(quit_now){
588
return -1;
589
}
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
591
478
if(ret != GNUTLS_E_SUCCESS){
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
595
481
}
596
482
597
483
{
598
484
const char *err;
599
do {
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
601
if(quit_now){
602
gnutls_deinit(*session);
603
return -1;
604
}
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
606
486
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
610
490
gnutls_deinit(*session);
611
491
return -1;
612
492
}
613
493
}
614
494
615
do {
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
617
mc->cred);
618
if(quit_now){
619
gnutls_deinit(*session);
620
return -1;
621
}
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
623
497
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
626
500
gnutls_deinit(*session);
627
501
return -1;
628
502
}
629
503
630
504
/* ignore client certificate if any. */
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
632
507
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
509
635
510
return 0;
636
511
}
639
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
640
515
__attribute__((unused)) const char *txt){}
641
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
642
520
/* Called when a Mandos server is found */
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
521
static int start_mandos_communication(const char *ip, uint16_t port,
645
522
AvahiIfIndex if_index,
646
int af, mandos_context *mc){
523
int af){
647
524
int ret, tcp_sd = -1;
648
525
ssize_t sret;
649
struct sockaddr_storage to;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
650
530
char *buffer = NULL;
651
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
652
532
size_t buffer_length = 0;
653
533
size_t buffer_capacity = 0;
654
534
size_t written;
655
int retval = -1;
535
int retval = 0;
656
536
gnutls_session_t session;
657
537
int pf; /* Protocol family */
658
538
659
errno = 0;
660
661
539
if(quit_now){
662
errno = EINTR;
663
540
return -1;
664
541
}
665
542
671
548
pf = PF_INET;
672
549
break;
673
550
default:
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
675
errno = EINVAL;
551
fprintf(stderr, "Bad address family: %d\n", af);
676
552
return -1;
677
553
}
678
554
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
682
bool match = false;
683
{
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
687
if(if_nametoindex(interface) == (unsigned int)if_index){
688
match = true;
689
break;
690
}
691
}
692
}
693
if(not match){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
696
if(debug){
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
700
} else {
701
fprintf_plus(stderr, "Skipping server on non-used interface"
702
" \"%s\"\n",
703
if_indextoname((unsigned int)if_index,
704
interface));
705
}
706
}
707
return -1;
708
}
709
}
710
711
ret = init_gnutls_session(&session, mc);
555
ret = init_gnutls_session(&session);
712
556
if(ret != 0){
713
557
return -1;
714
558
}
715
559
716
560
if(debug){
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
562
"\n", ip, port);
719
563
}
720
564
721
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
722
566
if(tcp_sd < 0){
723
int e = errno;
724
perror_plus("socket");
725
errno = e;
567
perror("socket");
568
retval = -1;
726
569
goto mandos_end;
727
570
}
728
571
729
572
if(quit_now){
730
errno = EINTR;
731
573
goto mandos_end;
732
574
}
733
575
734
576
memset(&to, 0, sizeof(to));
735
577
if(af == AF_INET6){
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
738
580
} else { /* IPv4 */
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
741
583
}
742
584
if(ret < 0 ){
743
int e = errno;
744
perror_plus("inet_pton");
745
errno = e;
585
perror("inet_pton");
586
retval = -1;
746
587
goto mandos_end;
747
588
}
748
589
if(ret == 0){
749
int e = errno;
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
751
errno = e;
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
752
592
goto mandos_end;
753
593
}
754
594
if(af == AF_INET6){
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
758
602
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
761
errno = EINVAL;
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
762
606
goto mandos_end;
763
607
}
764
608
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
609
to.in6.sin6_scope_id = (uint32_t)if_index;
766
610
}
767
611
} else {
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
612
to.in.sin_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
769
615
}
770
616
771
617
if(quit_now){
772
errno = EINTR;
773
618
goto mandos_end;
774
619
}
775
620
777
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
778
623
char interface[IF_NAMESIZE];
779
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
perror_plus("if_indextoname");
625
perror("if_indextoname");
781
626
} else {
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
784
629
}
785
630
} else {
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
788
633
}
789
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
636
const char *pcret;
791
637
if(af == AF_INET6){
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
639
sizeof(addrstr));
796
640
} else {
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
642
sizeof(addrstr));
801
643
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
644
if(pcret == NULL){
645
perror("inet_ntop");
646
} else {
647
if(strcmp(addrstr, ip) != 0){
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
649
}
808
650
}
809
651
}
810
652
811
653
if(quit_now){
812
errno = EINTR;
813
654
goto mandos_end;
814
655
}
815
656
816
657
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
819
659
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
822
661
}
823
662
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
663
perror("connect");
664
retval = -1;
829
665
goto mandos_end;
830
666
}
831
667
832
668
if(quit_now){
833
errno = EINTR;
834
669
goto mandos_end;
835
670
}
836
671
839
674
while(true){
840
675
size_t out_size = strlen(out);
841
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
677
out_size - written));
843
678
if(ret == -1){
844
int e = errno;
845
perror_plus("write");
846
errno = e;
679
perror("write");
680
retval = -1;
847
681
goto mandos_end;
848
682
}
849
683
written += (size_t)ret;
859
693
}
860
694
861
695
if(quit_now){
862
errno = EINTR;
863
696
goto mandos_end;
864
697
}
865
698
}
866
699
867
700
if(debug){
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
869
702
}
870
703
871
704
if(quit_now){
872
errno = EINTR;
873
705
goto mandos_end;
874
706
}
875
707
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
881
709
882
710
if(quit_now){
883
errno = EINTR;
884
711
goto mandos_end;
885
712
}
886
713
887
714
do {
888
715
ret = gnutls_handshake(session);
889
716
if(quit_now){
890
errno = EINTR;
891
717
goto mandos_end;
892
718
}
893
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
720
895
721
if(ret != GNUTLS_E_SUCCESS){
896
722
if(debug){
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
898
724
gnutls_perror(ret);
899
725
}
900
errno = EPROTO;
726
retval = -1;
901
727
goto mandos_end;
902
728
}
903
729
904
730
/* Read OpenPGP packet that contains the wanted password */
905
731
906
732
if(debug){
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
909
735
}
910
736
911
737
while(true){
912
738
913
739
if(quit_now){
914
errno = EINTR;
915
740
goto mandos_end;
916
741
}
917
742
918
743
buffer_capacity = incbuffer(&buffer, buffer_length,
919
buffer_capacity);
744
buffer_capacity);
920
745
if(buffer_capacity == 0){
921
int e = errno;
922
perror_plus("incbuffer");
923
errno = e;
746
perror("incbuffer");
747
retval = -1;
924
748
goto mandos_end;
925
749
}
926
750
927
751
if(quit_now){
928
errno = EINTR;
929
752
goto mandos_end;
930
753
}
931
754
944
767
ret = gnutls_handshake(session);
945
768
946
769
if(quit_now){
947
errno = EINTR;
948
770
goto mandos_end;
949
771
}
950
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
773
if(ret < 0){
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
954
775
gnutls_perror(ret);
955
errno = EPROTO;
776
retval = -1;
956
777
goto mandos_end;
957
778
}
958
779
break;
959
780
default:
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
781
fprintf(stderr, "Unknown error while reading data from"
782
" encrypted session with Mandos server\n");
783
retval = -1;
962
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
errno = EIO;
964
785
goto mandos_end;
965
786
}
966
787
} else {
969
790
}
970
791
971
792
if(debug){
972
fprintf_plus(stderr, "Closing TLS session\n");
973
}
974
975
if(quit_now){
976
errno = EINTR;
977
goto mandos_end;
978
}
979
980
do {
981
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
982
if(quit_now){
983
errno = EINTR;
984
goto mandos_end;
985
}
986
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
987
805
988
806
if(buffer_length > 0){
989
807
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
810
&decrypted_buffer);
992
811
if(decrypted_buffer_size >= 0){
993
812
994
813
written = 0;
995
814
while(written < (size_t) decrypted_buffer_size){
996
815
if(quit_now){
997
errno = EINTR;
998
816
goto mandos_end;
999
817
}
1000
818
1002
820
(size_t)decrypted_buffer_size - written,
1003
821
stdout);
1004
822
if(ret == 0 and ferror(stdout)){
1005
int e = errno;
1006
823
if(debug){
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
824
fprintf(stderr, "Error writing encrypted data: %s\n",
825
strerror(errno));
1009
826
}
1010
errno = e;
1011
goto mandos_end;
827
retval = -1;
828
break;
1012
829
}
1013
830
written += (size_t)ret;
1014
831
}
1015
retval = 0;
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
1016
835
}
836
} else {
837
retval = -1;
1017
838
}
1018
839
1019
840
/* Shutdown procedure */
1020
841
1021
842
mandos_end:
1022
{
1023
int e = errno;
1024
free(decrypted_buffer);
1025
free(buffer);
1026
if(tcp_sd >= 0){
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1028
}
1029
if(ret == -1){
1030
if(e == 0){
1031
e = errno;
1032
}
1033
perror_plus("close");
1034
}
1035
gnutls_deinit(session);
1036
errno = e;
1037
if(quit_now){
1038
errno = EINTR;
1039
retval = -1;
1040
}
843
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
1041
853
}
1042
854
return retval;
1043
855
}
1044
856
1045
__attribute__((nonnull))
1046
857
static void resolve_callback(AvahiSServiceResolver *r,
1047
858
AvahiIfIndex interface,
1048
859
AvahiProtocol proto,
1056
867
AVAHI_GCC_UNUSED AvahiStringList *txt,
1057
868
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
869
flags,
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
870
AVAHI_GCC_UNUSED void* userdata){
871
assert(r);
1063
872
1064
873
/* Called whenever a service has been resolved successfully or
1065
874
timed out */
1071
880
switch(event){
1072
881
default:
1073
882
case AVAHI_RESOLVER_FAILURE:
1074
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1075
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1076
domain,
1077
avahi_strerror(avahi_server_errno
1078
(((mandos_context*)mc)->server)));
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
1079
886
break;
1080
887
1081
888
case AVAHI_RESOLVER_FOUND:
1083
890
char ip[AVAHI_ADDRESS_STR_MAX];
1084
891
avahi_address_snprint(ip, sizeof(ip), address);
1085
892
if(debug){
1086
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1087
PRIdMAX ") on port %" PRIu16 "\n", name,
1088
host_name, ip, (intmax_t)interface, port);
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
1089
896
}
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
1094
899
if(ret == 0){
1095
avahi_simple_poll_quit(simple_poll);
1096
} else {
1097
if(not add_server(ip, (in_port_t)port, interface,
1098
avahi_proto_to_af(proto),
1099
&((mandos_context*)mc)->current_server)){
1100
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1101
" list\n", name);
1102
}
900
avahi_simple_poll_quit(mc.simple_poll);
1103
901
}
1104
902
}
1105
903
}
1115
913
const char *domain,
1116
914
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1117
915
flags,
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
916
AVAHI_GCC_UNUSED void* userdata){
917
assert(b);
1122
918
1123
919
/* Called whenever a new services becomes available on the LAN or
1124
920
is removed from the LAN */
1131
927
default:
1132
928
case AVAHI_BROWSER_FAILURE:
1133
929
1134
fprintf_plus(stderr, "(Avahi browser) %s\n",
1135
avahi_strerror(avahi_server_errno
1136
(((mandos_context*)mc)->server)));
1137
avahi_simple_poll_quit(simple_poll);
930
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
1138
933
return;
1139
934
1140
935
case AVAHI_BROWSER_NEW:
1143
938
the callback function is called the Avahi server will free the
1144
939
resolver for us. */
1145
940
1146
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1147
interface, protocol, name, type,
1148
domain, protocol, 0,
1149
resolve_callback, mc) == NULL)
1150
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1151
" %s\n", name,
1152
avahi_strerror(avahi_server_errno
1153
(((mandos_context*)mc)->server)));
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
resolve_callback, NULL) == NULL)
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
1154
946
break;
1155
947
1156
948
case AVAHI_BROWSER_REMOVE:
1159
951
case AVAHI_BROWSER_ALL_FOR_NOW:
1160
952
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1161
953
if(debug){
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1164
955
}
1165
956
break;
1166
957
}
1167
958
}
1168
959
1169
/* Signal handler that stops main loop after SIGTERM */
960
/* stop main loop after sigterm has been called */
1170
961
static void handle_sigterm(int sig){
1171
962
if(quit_now){
1172
963
return;
1174
965
quit_now = 1;
1175
966
signal_received = sig;
1176
967
int old_errno = errno;
1177
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1180
}
1181
errno = old_errno;
1182
}
1183
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
int ret;
1187
error_t ret_errno;
1188
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1190
if(s < 0){
1191
ret_errno = errno;
1192
perror_plus("socket");
1193
errno = ret_errno;
1194
return false;
1195
}
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1198
if(ret == -1){
1199
if(debug){
1200
ret_errno = errno;
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1203
}
1204
return false;
1205
}
1206
return true;
1207
}
1208
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1217
}
1218
return false;
1219
}
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1225
}
1226
return true;
1227
}
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1233
}
1234
return false;
1235
}
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1241
}
1242
return false;
1243
}
1244
1245
/* Accept this device */
1246
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1248
}
1249
return true;
1250
}
1251
1252
/*
1253
* This function determines if a directory entry in /sys/class/net
1254
* corresponds to an acceptable network device.
1255
* (This function is passed to scandir(3) as a filter function.)
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1258
int good_interface(const struct dirent *if_entry){
1259
if(if_entry->d_name[0] == '.'){
1260
return 0;
1261
}
1262
1263
struct ifreq ifr;
1264
if(not get_flags(if_entry->d_name, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1269
return 0;
1270
}
1271
1272
if(not good_flags(if_entry->d_name, &ifr)){
1273
return 0;
1274
}
1275
return 1;
1276
}
1277
1278
/*
1279
* This function determines if a network interface is up.
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1283
struct ifreq ifr;
1284
if(not get_flags(interface, &ifr)){
1285
if(debug){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1288
}
1289
return false;
1290
}
1291
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1293
}
1294
1295
/*
1296
* This function determines if a network interface is running
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1300
struct ifreq ifr;
1301
if(not get_flags(interface, &ifr)){
1302
if(debug){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1305
}
1306
return false;
1307
}
1308
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
}
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
int notdotentries(const struct dirent *direntry){
1314
/* Skip "." and ".." */
1315
if(direntry->d_name[0] == '.'
1316
and (direntry->d_name[1] == '\0'
1317
or (direntry->d_name[1] == '.'
1318
and direntry->d_name[2] == '\0'))){
1319
return 0;
1320
}
1321
return 1;
1322
}
1323
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1327
int ret;
1328
size_t sret;
1329
struct stat st;
1330
1331
if((direntry->d_name)[0] == '\0'){
1332
/* Empty name? */
1333
return 0;
1334
}
1335
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1338
"0123456789"
1339
"_.-");
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1357
if(ret == -1){
1358
if(debug){
1359
perror_plus("Could not stat hook");
1360
}
1361
return 0;
1362
}
1363
free(fullname);
1364
if(not (S_ISREG(st.st_mode))){
1365
/* Not a regular file */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1368
direntry->d_name);
1369
}
1370
return 0;
1371
}
1372
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1373
/* Not executable */
1374
if(debug){
1375
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1376
direntry->d_name);
1377
}
1378
return 0;
1379
}
1380
if(debug){
1381
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1382
direntry->d_name);
1383
}
1384
return 1;
1385
}
1386
1387
__attribute__((nonnull, warn_unused_result))
1388
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1389
mandos_context *mc){
1390
int ret;
1391
struct timespec now;
1392
struct timespec waited_time;
1393
intmax_t block_time;
1394
1395
while(true){
1396
if(mc->current_server == NULL){
1397
if(debug){
1398
fprintf_plus(stderr, "Wait until first server is found."
1399
" No timeout!\n");
1400
}
1401
ret = avahi_simple_poll_iterate(s, -1);
1402
} else {
1403
if(debug){
1404
fprintf_plus(stderr, "Check current_server if we should run"
1405
" it, or wait\n");
1406
}
1407
/* the current time */
1408
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1409
if(ret == -1){
1410
perror_plus("clock_gettime");
1411
return -1;
1412
}
1413
/* Calculating in ms how long time between now and server
1414
who we visted longest time ago. Now - last seen. */
1415
waited_time.tv_sec = (now.tv_sec
1416
- mc->current_server->last_seen.tv_sec);
1417
waited_time.tv_nsec = (now.tv_nsec
1418
- mc->current_server->last_seen.tv_nsec);
1419
/* total time is 10s/10,000ms.
1420
Converting to s from ms by dividing by 1,000,
1421
and ns to ms by dividing by 1,000,000. */
1422
block_time = ((retry_interval
1423
- ((intmax_t)waited_time.tv_sec * 1000))
1424
- ((intmax_t)waited_time.tv_nsec / 1000000));
1425
1426
if(debug){
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1428
block_time);
1429
}
1430
1431
if(block_time <= 0){
1432
ret = start_mandos_communication(mc->current_server->ip,
1433
mc->current_server->port,
1434
mc->current_server->if_index,
1435
mc->current_server->af, mc);
1436
if(ret == 0){
1437
avahi_simple_poll_quit(s);
1438
return 0;
1439
}
1440
ret = clock_gettime(CLOCK_MONOTONIC,
1441
&mc->current_server->last_seen);
1442
if(ret == -1){
1443
perror_plus("clock_gettime");
1444
return -1;
1445
}
1446
mc->current_server = mc->current_server->next;
1447
block_time = 0; /* Call avahi to find new Mandos
1448
servers, but don't block */
1449
}
1450
1451
ret = avahi_simple_poll_iterate(s, (int)block_time);
1452
}
1453
if(ret != 0){
1454
if(ret > 0 or errno != EINTR){
1455
return (ret != 1) ? ret : 0;
1456
}
1457
}
1458
}
1459
}
1460
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
1536
__attribute__((nonnull))
1537
void run_network_hooks(const char *mode, const char *interface,
1538
const float delay){
1539
struct dirent **direntries;
1540
if(hookdir_fd == -1){
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
1548
if(hookdir_fd == -1){
1549
if(errno == ENOENT){
1550
if(debug){
1551
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1552
" found\n", hookdir);
1553
}
1554
} else {
1555
perror_plus("open");
1556
}
1557
return;
1558
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
1583
if(numhooks == -1){
1584
perror_plus("scandir");
1585
return;
1586
}
1587
struct dirent *direntry;
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
1590
for(int i = 0; i < numhooks; i++){
1591
direntry = direntries[i];
1592
if(debug){
1593
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1594
direntry->d_name);
1595
}
1596
pid_t hook_pid = fork();
1597
if(hook_pid == 0){
1598
/* Child */
1599
/* Raise privileges */
1600
if(raise_privileges_permanently() != 0){
1601
perror_plus("Failed to raise privileges");
1602
_exit(EX_NOPERM);
1603
}
1604
/* Set group */
1605
errno = 0;
1606
ret = setgid(0);
1607
if(ret == -1){
1608
perror_plus("setgid");
1609
_exit(EX_NOPERM);
1610
}
1611
/* Reset supplementary groups */
1612
errno = 0;
1613
ret = setgroups(0, NULL);
1614
if(ret == -1){
1615
perror_plus("setgroups");
1616
_exit(EX_NOPERM);
1617
}
1618
ret = dup2(devnull, STDIN_FILENO);
1619
if(ret == -1){
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1621
_exit(EX_OSERR);
1622
}
1623
ret = close(devnull);
1624
if(ret == -1){
1625
perror_plus("close");
1626
_exit(EX_OSERR);
1627
}
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1629
if(ret == -1){
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1631
_exit(EX_OSERR);
1632
}
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1634
if(ret == -1){
1635
perror_plus("setenv");
1636
_exit(EX_OSERR);
1637
}
1638
ret = setenv("DEVICE", interface, 1);
1639
if(ret == -1){
1640
perror_plus("setenv");
1641
_exit(EX_OSERR);
1642
}
1643
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1644
if(ret == -1){
1645
perror_plus("setenv");
1646
_exit(EX_OSERR);
1647
}
1648
ret = setenv("MODE", mode, 1);
1649
if(ret == -1){
1650
perror_plus("setenv");
1651
_exit(EX_OSERR);
1652
}
1653
char *delaystring;
1654
ret = asprintf(&delaystring, "%f", (double)delay);
1655
if(ret == -1){
1656
perror_plus("asprintf");
1657
_exit(EX_OSERR);
1658
}
1659
ret = setenv("DELAY", delaystring, 1);
1660
if(ret == -1){
1661
free(delaystring);
1662
perror_plus("setenv");
1663
_exit(EX_OSERR);
1664
}
1665
free(delaystring);
1666
if(connect_to != NULL){
1667
ret = setenv("CONNECT", connect_to, 1);
1668
if(ret == -1){
1669
perror_plus("setenv");
1670
_exit(EX_OSERR);
1671
}
1672
}
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
1675
perror_plus("fexecve");
1676
_exit(EXIT_FAILURE);
1677
}
1678
} else {
1679
int status;
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1681
perror_plus("waitpid");
1682
continue;
1683
}
1684
if(WIFEXITED(status)){
1685
if(WEXITSTATUS(status) != 0){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1687
" with status %d\n", direntry->d_name,
1688
WEXITSTATUS(status));
1689
continue;
1690
}
1691
} else if(WIFSIGNALED(status)){
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1693
" signal %d\n", direntry->d_name,
1694
WTERMSIG(status));
1695
continue;
1696
} else {
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
1698
" crashed\n", direntry->d_name);
1699
continue;
1700
}
1701
}
1702
if(debug){
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1704
direntry->d_name);
1705
}
1706
}
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1708
perror_plus("close");
1709
} else {
1710
hookdir_fd = -1;
1711
}
1712
close(devnull);
1713
}
1714
1715
__attribute__((nonnull, warn_unused_result))
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
1719
int ret;
1720
struct ifreq network;
1721
unsigned int if_index = if_nametoindex(interface);
1722
if(if_index == 0){
1723
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1724
errno = old_errno;
1725
return ENXIO;
1726
}
1727
1728
if(quit_now){
1729
errno = old_errno;
1730
return EINTR;
1731
}
1732
1733
if(not interface_is_up(interface)){
1734
error_t ret_errno = 0, ioctl_errno = 0;
1735
if(not get_flags(interface, &network)){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
errno = old_errno;
1740
return ret_errno;
1741
}
1742
network.ifr_flags |= IFF_UP; /* set flag */
1743
1744
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1745
if(sd == -1){
1746
ret_errno = errno;
1747
perror_plus("socket");
1748
errno = old_errno;
1749
return ret_errno;
1750
}
1751
1752
if(quit_now){
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1754
if(ret == -1){
1755
perror_plus("close");
1756
}
1757
errno = old_errno;
1758
return EINTR;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise privileges */
1767
ret_errno = raise_privileges();
1768
if(ret_errno != 0){
1769
perror_plus("Failed to raise privileges");
1770
}
1771
1772
#ifdef __linux__
1773
int ret_linux;
1774
bool restore_loglevel = false;
1775
if(ret_errno == 0){
1776
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1777
messages about the network interface to mess up the prompt */
1778
ret_linux = klogctl(8, NULL, 5);
1779
if(ret_linux == -1){
1780
perror_plus("klogctl");
1781
} else {
1782
restore_loglevel = true;
1783
}
1784
}
1785
#endif /* __linux__ */
1786
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1787
ioctl_errno = errno;
1788
#ifdef __linux__
1789
if(restore_loglevel){
1790
ret_linux = klogctl(7, NULL, 0);
1791
if(ret_linux == -1){
1792
perror_plus("klogctl");
1793
}
1794
}
1795
#endif /* __linux__ */
1796
1797
/* If raise_privileges() succeeded above */
1798
if(ret_errno == 0){
1799
/* Lower privileges */
1800
ret_errno = lower_privileges();
1801
if(ret_errno != 0){
1802
errno = ret_errno;
1803
perror_plus("Failed to lower privileges");
1804
}
1805
}
1806
1807
/* Close the socket */
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1809
if(ret == -1){
1810
perror_plus("close");
1811
}
1812
1813
if(ret_setflags == -1){
1814
errno = ioctl_errno;
1815
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1816
errno = old_errno;
1817
return ioctl_errno;
1818
}
1819
} else if(debug){
1820
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1821
interface);
1822
}
1823
1824
/* Sleep checking until interface is running.
1825
Check every 0.25s, up to total time of delay */
1826
for(int i=0; i < delay * 4; i++){
1827
if(interface_is_running(interface)){
1828
break;
1829
}
1830
struct timespec sleeptime = { .tv_nsec = 250000000 };
1831
ret = nanosleep(&sleeptime, NULL);
1832
if(ret == -1 and errno != EINTR){
1833
perror_plus("nanosleep");
1834
}
1835
}
1836
1837
errno = old_errno;
1838
return 0;
1839
}
1840
1841
__attribute__((nonnull, warn_unused_result))
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
1844
struct ifreq network;
1845
unsigned int if_index = if_nametoindex(interface);
1846
if(if_index == 0){
1847
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1848
errno = old_errno;
1849
return ENXIO;
1850
}
1851
if(interface_is_up(interface)){
1852
error_t ret_errno = 0, ioctl_errno = 0;
1853
if(not get_flags(interface, &network) and debug){
1854
ret_errno = errno;
1855
fprintf_plus(stderr, "Failed to get flags for interface "
1856
"\"%s\"\n", interface);
1857
errno = old_errno;
1858
return ret_errno;
1859
}
1860
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1861
1862
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1863
if(sd == -1){
1864
ret_errno = errno;
1865
perror_plus("socket");
1866
errno = old_errno;
1867
return ret_errno;
1868
}
1869
1870
if(debug){
1871
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1872
interface);
1873
}
1874
1875
/* Raise privileges */
1876
ret_errno = raise_privileges();
1877
if(ret_errno != 0){
1878
perror_plus("Failed to raise privileges");
1879
}
1880
1881
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1882
ioctl_errno = errno;
1883
1884
/* If raise_privileges() succeeded above */
1885
if(ret_errno == 0){
1886
/* Lower privileges */
1887
ret_errno = lower_privileges();
1888
if(ret_errno != 0){
1889
errno = ret_errno;
1890
perror_plus("Failed to lower privileges");
1891
}
1892
}
1893
1894
/* Close the socket */
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1896
if(ret == -1){
1897
perror_plus("close");
1898
}
1899
1900
if(ret_setflags == -1){
1901
errno = ioctl_errno;
1902
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1903
errno = old_errno;
1904
return ioctl_errno;
1905
}
1906
} else if(debug){
1907
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1908
interface);
1909
}
1910
1911
errno = old_errno;
1912
return 0;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
1913
972
}
1914
973
1915
974
int main(int argc, char *argv[]){
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
1920
975
AvahiSServiceBrowser *sb = NULL;
1921
error_t ret_errno;
976
int error;
1922
977
int ret;
1923
978
intmax_t tmpmax;
1924
979
char *tmp;
1925
980
int exitcode = EXIT_SUCCESS;
1926
char *interfaces_to_take_down = NULL;
1927
size_t interfaces_to_take_down_size = 0;
1928
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1929
char old_tempdir[] = "/tmp/mandosXXXXXX";
1930
char *tempdir = NULL;
981
const char *interface = "eth0";
982
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
1931
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1932
991
const char *seckey = PATHDIR "/" SECKEY;
1933
992
const char *pubkey = PATHDIR "/" PUBKEY;
1934
char *interfaces_hooks = NULL;
1935
993
1936
994
bool gnutls_initialized = false;
1937
995
bool gpgme_initialized = false;
1938
996
float delay = 2.5f;
1939
double retry_interval = 10; /* 10s between trying a server and
1940
retrying the same server again */
1941
997
1942
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
struct sigaction old_sigterm_action;
1943
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1944
1000
1945
uid = getuid();
1946
gid = getgid();
1947
1948
/* Lower any group privileges we might have, just to be safe */
1949
errno = 0;
1950
ret = setgid(gid);
1951
if(ret == -1){
1952
perror_plus("setgid");
1953
}
1954
1955
/* Lower user privileges (temporarily) */
1956
errno = 0;
1957
ret = seteuid(uid);
1958
if(ret == -1){
1959
perror_plus("seteuid");
1960
}
1961
1962
if(quit_now){
1963
goto end;
1964
}
1965
1966
1001
{
1967
1002
struct argp_option options[] = {
1968
1003
{ .name = "debug", .key = 128,
1997
1032
.arg = "SECONDS",
1998
1033
.doc = "Maximum delay to wait for interface startup",
1999
1034
.group = 2 },
2000
{ .name = "retry", .key = 132,
2001
.arg = "SECONDS",
2002
.doc = "Retry interval used when denied by the Mandos server",
2003
.group = 2 },
2004
{ .name = "network-hook-dir", .key = 133,
2005
.arg = "DIR",
2006
.doc = "Directory where network hooks are located",
2007
.group = 2 },
2008
/*
2009
* These reproduce what we would get without ARGP_NO_HELP
2010
*/
2011
{ .name = "help", .key = '?',
2012
.doc = "Give this help list", .group = -1 },
2013
{ .name = "usage", .key = -3,
2014
.doc = "Give a short usage message", .group = -1 },
2015
{ .name = "version", .key = 'V',
2016
.doc = "Print program version", .group = -1 },
2017
1035
{ .name = NULL }
2018
1036
};
2019
1037
2020
1038
error_t parse_opt(int key, char *arg,
2021
1039
struct argp_state *state){
2022
errno = 0;
2023
1040
switch(key){
2024
1041
case 128: /* --debug */
2025
1042
debug = true;
2028
1045
connect_to = arg;
2029
1046
break;
2030
1047
case 'i': /* --interface */
2031
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2032
arg, (int)',');
2033
if(ret_errno != 0){
2034
argp_error(state, "%s", strerror(ret_errno));
2035
}
1048
interface = arg;
2036
1049
break;
2037
1050
case 's': /* --seckey */
2038
1051
seckey = arg;
2045
1058
tmpmax = strtoimax(arg, &tmp, 10);
2046
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
2047
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2048
argp_error(state, "Bad number of DH bits");
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
2049
1063
}
2050
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2051
1065
break;
2056
1070
errno = 0;
2057
1071
delay = strtof(arg, &tmp);
2058
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
2059
argp_error(state, "Bad delay");
2060
}
2061
case 132: /* --retry */
2062
errno = 0;
2063
retry_interval = strtod(arg, &tmp);
2064
if(errno != 0 or tmp == arg or *tmp != '\0'
2065
or (retry_interval * 1000) > INT_MAX
2066
or retry_interval < 0){
2067
argp_error(state, "Bad retry interval");
2068
}
2069
break;
2070
case 133: /* --network-hook-dir */
2071
hookdir = arg;
2072
break;
2073
/*
2074
* These reproduce what we would get without ARGP_NO_HELP
2075
*/
2076
case '?': /* --help */
2077
argp_state_help(state, state->out_stream,
2078
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2079
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2080
case -3: /* --usage */
2081
argp_state_help(state, state->out_stream,
2082
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2083
case 'V': /* --version */
2084
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2085
exit(argp_err_exit_status);
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
2086
1080
break;
2087
1081
default:
2088
1082
return ARGP_ERR_UNKNOWN;
2089
1083
}
2090
return errno;
1084
return 0;
2091
1085
}
2092
1086
2093
1087
struct argp argp = { .options = options, .parser = parse_opt,
2094
1088
.args_doc = "",
2095
1089
.doc = "Mandos client -- Get and decrypt"
2096
1090
" passwords from a Mandos server" };
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2099
switch(ret){
2100
case 0:
2101
break;
2102
case ENOMEM:
2103
default:
2104
errno = ret;
2105
perror_plus("argp_parse");
2106
exitcode = EX_OSERR;
2107
goto end;
2108
case EINVAL:
2109
exitcode = EX_USAGE;
2110
goto end;
2111
}
2112
}
2113
2114
{
2115
/* Work around Debian bug #633582:
2116
<http://bugs.debian.org/633582> */
2117
2118
/* Re-raise privileges */
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to raise privileges");
2123
} else {
2124
struct stat st;
2125
2126
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2127
int seckey_fd = open(seckey, O_RDONLY);
2128
if(seckey_fd == -1){
2129
perror_plus("open");
2130
} else {
2131
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2132
if(ret == -1){
2133
perror_plus("fstat");
2134
} else {
2135
if(S_ISREG(st.st_mode)
2136
and st.st_uid == 0 and st.st_gid == 0){
2137
ret = fchown(seckey_fd, uid, gid);
2138
if(ret == -1){
2139
perror_plus("fchown");
2140
}
2141
}
2142
}
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2144
}
2145
}
2146
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2149
if(pubkey_fd == -1){
2150
perror_plus("open");
2151
} else {
2152
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2153
if(ret == -1){
2154
perror_plus("fstat");
2155
} else {
2156
if(S_ISREG(st.st_mode)
2157
and st.st_uid == 0 and st.st_gid == 0){
2158
ret = fchown(pubkey_fd, uid, gid);
2159
if(ret == -1){
2160
perror_plus("fchown");
2161
}
2162
}
2163
}
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2168
/* Lower privileges */
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2172
perror_plus("Failed to lower privileges");
2173
}
2174
}
2175
}
2176
2177
/* Remove invalid interface names (except "none") */
2178
{
2179
char *interface = NULL;
2180
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2181
interface))){
2182
if(strcmp(interface, "none") != 0
2183
and if_nametoindex(interface) == 0){
2184
if(interface[0] != '\0'){
2185
fprintf_plus(stderr, "Not using nonexisting interface"
2186
" \"%s\"\n", interface);
2187
}
2188
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2189
interface = NULL;
2190
}
2191
}
2192
}
2193
2194
/* Run network hooks */
2195
{
2196
if(mc.interfaces != NULL){
2197
interfaces_hooks = malloc(mc.interfaces_size);
2198
if(interfaces_hooks == NULL){
2199
perror_plus("malloc");
2200
goto end;
2201
}
2202
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2203
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2204
}
2205
run_network_hooks("start", interfaces_hooks != NULL ?
2206
interfaces_hooks : "", delay);
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
2207
1097
}
2208
1098
2209
1099
if(not debug){
2214
1104
from the signal handler */
2215
1105
/* Initialize the pseudo-RNG for Avahi */
2216
1106
srand((unsigned int) time(NULL));
2217
simple_poll = avahi_simple_poll_new();
2218
if(simple_poll == NULL){
2219
fprintf_plus(stderr,
2220
"Avahi: Failed to create simple poll object.\n");
2221
exitcode = EX_UNAVAILABLE;
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
2222
1111
goto end;
2223
1112
}
2224
1113
2225
1114
sigemptyset(&sigterm_action.sa_mask);
2226
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2227
1116
if(ret == -1){
2228
perror_plus("sigaddset");
2229
exitcode = EX_OSERR;
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
2230
1119
goto end;
2231
1120
}
2232
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2233
1122
if(ret == -1){
2234
perror_plus("sigaddset");
2235
exitcode = EX_OSERR;
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
2236
1125
goto end;
2237
1126
}
2238
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2239
1128
if(ret == -1){
2240
perror_plus("sigaddset");
2241
exitcode = EX_OSERR;
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
2242
1131
goto end;
2243
1132
}
2244
1133
/* Need to check if the handler is SIG_IGN before handling:
2247
1136
*/
2248
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2249
1138
if(ret == -1){
2250
perror_plus("sigaction");
2251
return EX_OSERR;
1139
perror("sigaction");
1140
return EXIT_FAILURE;
2252
1141
}
2253
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
2254
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
2255
1144
if(ret == -1){
2256
perror_plus("sigaction");
2257
exitcode = EX_OSERR;
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
2258
1147
goto end;
2259
1148
}
2260
1149
}
2261
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2262
1151
if(ret == -1){
2263
perror_plus("sigaction");
2264
return EX_OSERR;
1152
perror("sigaction");
1153
return EXIT_FAILURE;
2265
1154
}
2266
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
2267
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2268
1157
if(ret == -1){
2269
perror_plus("sigaction");
2270
exitcode = EX_OSERR;
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
2271
1160
goto end;
2272
1161
}
2273
1162
}
2274
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2275
1164
if(ret == -1){
2276
perror_plus("sigaction");
2277
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2278
1167
}
2279
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2280
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2281
1170
if(ret == -1){
2282
perror_plus("sigaction");
2283
exitcode = EX_OSERR;
2284
goto end;
2285
}
2286
}
2287
2288
/* If no interfaces were specified, make a list */
2289
if(mc.interfaces == NULL){
2290
struct dirent **direntries;
2291
/* Look for any good interfaces */
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2293
alphasort);
2294
if(ret >= 1){
2295
/* Add all found interfaces to interfaces list */
2296
for(int i = 0; i < ret; ++i){
2297
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2298
direntries[i]->d_name);
2299
if(ret_errno != 0){
2300
errno = ret_errno;
2301
perror_plus("argz_add");
2302
continue;
2303
}
2304
if(debug){
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2306
direntries[i]->d_name);
2307
}
2308
}
2309
free(direntries);
2310
} else {
2311
free(direntries);
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2313
exitcode = EXIT_FAILURE;
2314
goto end;
2315
}
2316
}
2317
2318
/* Bring up interfaces which are down, and remove any "none"s */
2319
{
2320
char *interface = NULL;
2321
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2322
interface))){
2323
/* If interface name is "none", stop bringing up interfaces.
2324
Also remove all instances of "none" from the list */
2325
if(strcmp(interface, "none") == 0){
2326
argz_delete(&mc.interfaces, &mc.interfaces_size,
2327
interface);
2328
interface = NULL;
2329
while((interface = argz_next(mc.interfaces,
2330
mc.interfaces_size, interface))){
2331
if(strcmp(interface, "none") == 0){
2332
argz_delete(&mc.interfaces, &mc.interfaces_size,
2333
interface);
2334
interface = NULL;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
1200
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
1214
}
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
1229
}
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
if(ret == -1){
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
2335
1243
}
2336
1244
}
1245
#endif /* __linux__ */
1246
goto end;
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
2337
1255
break;
2338
1256
}
2339
bool interface_was_up = interface_is_up(interface);
2340
errno = bring_up_interface(interface, delay);
2341
if(not interface_was_up){
2342
if(errno != 0){
2343
perror_plus("Failed to bring up interface");
2344
} else {
2345
errno = argz_add(&interfaces_to_take_down,
2346
&interfaces_to_take_down_size,
2347
interface);
2348
if(errno != 0){
2349
perror_plus("argz_add");
2350
}
2351
}
2352
}
2353
}
2354
if(debug and (interfaces_to_take_down == NULL)){
2355
fprintf_plus(stderr, "No interfaces were brought up\n");
2356
}
2357
}
2358
2359
/* If we only got one interface, explicitly use only that one */
2360
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2361
if(debug){
2362
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2363
mc.interfaces);
2364
}
2365
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2366
}
2367
2368
if(quit_now){
2369
goto end;
2370
}
2371
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
2373
if(ret == -1){
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
2375
exitcode = EX_UNAVAILABLE;
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
errno = 0;
1289
setgid(gid);
1290
if(ret == -1){
1291
perror("setgid");
1292
}
1293
1294
ret = setuid(uid);
1295
if(ret == -1){
1296
perror("setuid");
1297
}
1298
1299
if(quit_now){
1300
goto end;
1301
}
1302
1303
ret = init_gnutls_global(pubkey, seckey);
1304
if(ret == -1){
1305
fprintf(stderr, "init_gnutls_global failed\n");
1306
exitcode = EXIT_FAILURE;
2376
1307
goto end;
2377
1308
} else {
2378
1309
gnutls_initialized = true;
2382
1313
goto end;
2383
1314
}
2384
1315
2385
/* Try /run/tmp before /tmp */
2386
tempdir = mkdtemp(run_tempdir);
2387
if(tempdir == NULL and errno == ENOENT){
2388
if(debug){
2389
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2390
run_tempdir, old_tempdir);
2391
}
2392
tempdir = mkdtemp(old_tempdir);
2393
}
2394
if(tempdir == NULL){
2395
perror_plus("mkdtemp");
1316
tempdir_created = true;
1317
if(mkdtemp(tempdir) == NULL){
1318
tempdir_created = false;
1319
perror("mkdtemp");
2396
1320
goto end;
2397
1321
}
2398
1322
2400
1324
goto end;
2401
1325
}
2402
1326
2403
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2404
fprintf_plus(stderr, "init_gpgme failed\n");
2405
exitcode = EX_UNAVAILABLE;
1327
if(not init_gpgme(pubkey, seckey, tempdir)){
1328
fprintf(stderr, "init_gpgme failed\n");
1329
exitcode = EXIT_FAILURE;
2406
1330
goto end;
2407
1331
} else {
2408
1332
gpgme_initialized = true;
2416
1340
/* Connect directly, do not use Zeroconf */
2417
1341
/* (Mainly meant for debugging) */
2418
1342
char *address = strrchr(connect_to, ':');
2419
2420
1343
if(address == NULL){
2421
fprintf_plus(stderr, "No colon in address\n");
2422
exitcode = EX_USAGE;
1344
fprintf(stderr, "No colon in address\n");
1345
exitcode = EXIT_FAILURE;
2423
1346
goto end;
2424
1347
}
2425
1348
2427
1350
goto end;
2428
1351
}
2429
1352
2430
in_port_t port;
1353
uint16_t port;
2431
1354
errno = 0;
2432
1355
tmpmax = strtoimax(address+1, &tmp, 10);
2433
1356
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2434
or tmpmax != (in_port_t)tmpmax){
2435
fprintf_plus(stderr, "Bad port number\n");
2436
exitcode = EX_USAGE;
1357
or tmpmax != (uint16_t)tmpmax){
1358
fprintf(stderr, "Bad port number\n");
1359
exitcode = EXIT_FAILURE;
2437
1360
goto end;
2438
1361
}
2439
1362
2440
1363
if(quit_now){
2441
1364
goto end;
2442
1365
}
2443
1366
2444
port = (in_port_t)tmpmax;
1367
port = (uint16_t)tmpmax;
2445
1368
*address = '\0';
1369
address = connect_to;
2446
1370
/* Colon in address indicates IPv6 */
2447
1371
int af;
2448
if(strchr(connect_to, ':') != NULL){
1372
if(strchr(address, ':') != NULL){
2449
1373
af = AF_INET6;
2450
/* Accept [] around IPv6 address - see RFC 5952 */
2451
if(connect_to[0] == '[' and address[-1] == ']')
2452
{
2453
connect_to++;
2454
address[-1] = '\0';
2455
}
2456
1374
} else {
2457
1375
af = AF_INET;
2458
1376
}
2459
address = connect_to;
2460
1377
2461
1378
if(quit_now){
2462
1379
goto end;
2463
1380
}
2464
1381
2465
while(not quit_now){
2466
ret = start_mandos_communication(address, port, if_index, af,
2467
&mc);
2468
if(quit_now or ret == 0){
2469
break;
2470
}
2471
if(debug){
2472
fprintf_plus(stderr, "Retrying in %d seconds\n",
2473
(int)retry_interval);
2474
}
2475
sleep((unsigned int)retry_interval);
2476
}
2477
2478
if(not quit_now){
1382
ret = start_mandos_communication(address, port, if_index, af);
1383
if(ret < 0){
1384
exitcode = EXIT_FAILURE;
1385
} else {
2479
1386
exitcode = EXIT_SUCCESS;
2480
1387
}
2481
2482
1388
goto end;
2483
1389
}
2484
1390
2496
1402
config.publish_domain = 0;
2497
1403
2498
1404
/* Allocate a new server */
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2500
&config, NULL, NULL, &ret_errno);
1405
mc.server = avahi_server_new(avahi_simple_poll_get
1406
(mc.simple_poll), &config, NULL,
1407
NULL, &error);
2501
1408
2502
1409
/* Free the Avahi configuration data */
2503
1410
avahi_server_config_free(&config);
2505
1412
2506
1413
/* Check if creating the Avahi server object succeeded */
2507
1414
if(mc.server == NULL){
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2509
avahi_strerror(ret_errno));
2510
exitcode = EX_UNAVAILABLE;
1415
fprintf(stderr, "Failed to create Avahi server: %s\n",
1416
avahi_strerror(error));
1417
exitcode = EXIT_FAILURE;
2511
1418
goto end;
2512
1419
}
2513
1420
2518
1425
/* Create the Avahi service browser */
2519
1426
sb = avahi_s_service_browser_new(mc.server, if_index,
2520
1427
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2521
NULL, 0, browse_callback,
2522
(void *)&mc);
1428
NULL, 0, browse_callback, NULL);
2523
1429
if(sb == NULL){
2524
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2525
avahi_strerror(avahi_server_errno(mc.server)));
2526
exitcode = EX_UNAVAILABLE;
1430
fprintf(stderr, "Failed to create service browser: %s\n",
1431
avahi_strerror(avahi_server_errno(mc.server)));
1432
exitcode = EXIT_FAILURE;
2527
1433
goto end;
2528
1434
}
2529
1435
2534
1440
/* Run the main loop */
2535
1441
2536
1442
if(debug){
2537
fprintf_plus(stderr, "Starting Avahi loop search\n");
1443
fprintf(stderr, "Starting Avahi loop search\n");
2538
1444
}
2539
1445
2540
ret = avahi_loop_with_timeout(simple_poll,
2541
(int)(retry_interval * 1000), &mc);
2542
if(debug){
2543
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2544
(ret == 0) ? "successfully" : "with error");
2545
}
1446
avahi_simple_poll_loop(mc.simple_poll);
2546
1447
2547
1448
end:
2548
1449
2549
1450
if(debug){
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1451
fprintf(stderr, "%s exiting\n", argv[0]);
2551
1452
}
2552
1453
2553
1454
/* Cleanup things */
2554
free(mc.interfaces);
2555
2556
1455
if(sb != NULL)
2557
1456
avahi_s_service_browser_free(sb);
2558
1457
2559
1458
if(mc.server != NULL)
2560
1459
avahi_server_free(mc.server);
2561
1460
2562
if(simple_poll != NULL)
2563
avahi_simple_poll_free(simple_poll);
1461
if(mc.simple_poll != NULL)
1462
avahi_simple_poll_free(mc.simple_poll);
2564
1463
2565
1464
if(gnutls_initialized){
2566
1465
gnutls_certificate_free_credentials(mc.cred);
2572
1471
gpgme_release(mc.ctx);
2573
1472
}
2574
1473
2575
/* Cleans up the circular linked list of Mandos servers the client
2576
has seen */
2577
if(mc.current_server != NULL){
2578
mc.current_server->prev->next = NULL;
2579
while(mc.current_server != NULL){
2580
server *next = mc.current_server->next;
2581
free(mc.current_server);
2582
mc.current_server = next;
1474
/* Take down the network interface */
1475
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1477
if(ret == -1){
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1482
if(ret == -1){
1483
perror("ioctl SIOCSIFFLAGS");
1484
}
1485
}
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1487
if(ret == -1){
1488
perror("close");
2583
1489
}
2584
1490
}
2585
1491
2586
/* Re-raise privileges */
2587
{
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
2590
perror_plus("Failed to raise privileges");
1492
/* Removes the temp directory used by GPGME */
1493
if(tempdir_created){
1494
DIR *d;
1495
struct dirent *direntry;
1496
d = opendir(tempdir);
1497
if(d == NULL){
1498
if(errno != ENOENT){
1499
perror("opendir");
1500
}
2591
1501
} else {
2592
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2596
2597
/* Take down the network interfaces which were brought up */
2598
{
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to take down interface");
2607
}
2608
}
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
" down\n");
2612
}
2613
}
2614
}
2615
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
perror_plus("Failed to lower privileges permanently");
2619
}
2620
}
2621
2622
free(interfaces_to_take_down);
2623
free(interfaces_hooks);
2624
2625
/* Removes the GPGME temp directory and all files inside */
2626
if(tempdir != NULL){
2627
struct dirent **direntries = NULL;
2628
struct dirent *direntry = NULL;
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2630
alphasort);
2631
if(numentries > 0){
2632
for(int i = 0; i < numentries; i++){
2633
direntry = direntries[i];
1502
while(true){
1503
direntry = readdir(d);
1504
if(direntry == NULL){
1505
break;
1506
}
1507
/* Skip "." and ".." */
1508
if(direntry->d_name[0] == '.'
1509
and (direntry->d_name[1] == '\0'
1510
or (direntry->d_name[1] == '.'
1511
and direntry->d_name[2] == '\0'))){
1512
continue;
1513
}
2634
1514
char *fullname = NULL;
2635
1515
ret = asprintf(&fullname, "%s/%s", tempdir,
2636
1516
direntry->d_name);
2637
1517
if(ret < 0){
2638
perror_plus("asprintf");
1518
perror("asprintf");
2639
1519
continue;
2640
1520
}
2641
1521
ret = remove(fullname);
2642
1522
if(ret == -1){
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2644
strerror(errno));
1523
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1524
strerror(errno));
2645
1525
}
2646
1526
free(fullname);
2647
1527
}
2648
}
2649
2650
/* need to clean even if 0 because man page doesn't specify */
2651
free(direntries);
2652
if(numentries == -1){
2653
perror_plus("scandir");
1528
closedir(d);
2654
1529
}
2655
1530
ret = rmdir(tempdir);
2656
1531
if(ret == -1 and errno != ENOENT){
2657
perror_plus("rmdir");
1532
perror("rmdir");
2658
1533
}
2659
1534
}
2660
1535
2661
1536
if(quit_now){
2662
1537
sigemptyset(&old_sigterm_action.sa_mask);
2663
1538
old_sigterm_action.sa_handler = SIG_DFL;
2664
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2665
&old_sigterm_action,
2666
NULL));
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2667
1540
if(ret == -1){
2668
perror_plus("sigaction");
2669
}
2670
do {
2671
ret = raise(signal_received);
2672
} while(ret != 0 and errno == EINTR);
2673
if(ret != 0){
2674
perror_plus("raise");
2675
abort();
2676
}
2677
TEMP_FAILURE_RETRY(pause());
1541
perror("sigaction");
1542
}
1543
raise(signal_received);
2678
1544
}
2679
1545
2680
1546
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0