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- Committer: Teddy Hogeborn
- Date: 2014-06-07 22:37:22 UTC
- Revision ID: teddy@recompile.se-20140607223722-55qmdr3n9x39pvx4
Make mandos-client use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
- 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() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
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 */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
84
sigaction(), SIGTERM, sig_atomic_t,
84
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
85
97
86
98
#ifdef __linux__
87
99
#include <sys/klog.h> /* klogctl() */
105
117
init_gnutls_session(),
106
118
GNUTLS_* */
107
119
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
110
122
111
123
/* GPGME */
112
124
#include <gpgme.h> /* All GPGME types, constants and
120
132
#define PATHDIR "/conf/conf.d/mandos"
121
133
#define SECKEY "seckey.txt"
122
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
136
124
137
bool debug = false;
125
138
static const char mandos_protocol_version[] = "1";
126
139
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
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;
128
158
129
159
/* Used for passing in values through the Avahi callback functions */
130
160
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
161
AvahiServer *server;
133
162
gnutls_certificate_credentials_t cred;
134
163
unsigned int dh_bits;
135
164
gnutls_dh_params_t dh_params;
136
165
const char *priority;
137
166
gpgme_ctx_t ctx;
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
138
170
} mandos_context;
139
171
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" };
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
}
144
196
145
197
/*
146
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
199
* bytes. "buffer_capacity" is how much is currently allocated,
148
200
* "buffer_length" is how much is already used.
149
201
*/
202
__attribute__((nonnull, warn_unused_result))
150
203
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
204
size_t buffer_capacity){
152
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
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;
155
212
return 0;
156
213
}
214
*buffer = new_buf;
157
215
buffer_capacity += BUFFER_SIZE;
158
216
}
159
217
return buffer_capacity;
160
218
}
161
219
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
162
258
/*
163
259
* Initialize GPGME.
164
260
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
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){
167
266
gpgme_error_t rc;
168
267
gpgme_engine_info_t engine_info;
169
268
170
171
269
/*
172
270
* Helper function to insert pub and seckey to the engine keyring.
173
271
*/
174
bool import_key(const char *filename){
272
bool import_key(const char * const filename){
175
273
int ret;
176
274
int fd;
177
275
gpgme_data_t pgp_data;
178
276
179
277
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
278
if(fd == -1){
181
perror("open");
279
perror_plus("open");
182
280
return false;
183
281
}
184
282
185
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
284
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
189
287
return false;
190
288
}
191
289
192
rc = gpgme_op_import(mc.ctx, pgp_data);
290
rc = gpgme_op_import(mc->ctx, pgp_data);
193
291
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
196
294
return false;
197
295
}
198
296
199
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
298
if(ret == -1){
201
perror("close");
299
perror_plus("close");
202
300
}
203
301
gpgme_data_release(pgp_data);
204
302
return true;
205
303
}
206
304
207
305
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
306
fprintf_plus(stderr, "Initializing GPGME\n");
209
307
}
210
308
211
309
/* Init GPGME */
212
310
gpgme_check_version(NULL);
213
311
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
312
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
217
315
return false;
218
316
}
219
317
220
/* Set GPGME home directory for the OpenPGP engine only */
318
/* Set GPGME home directory for the OpenPGP engine only */
221
319
rc = gpgme_get_engine_info(&engine_info);
222
320
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
225
323
return false;
226
324
}
227
325
while(engine_info != NULL){
233
331
engine_info = engine_info->next;
234
332
}
235
333
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
237
336
return false;
238
337
}
239
338
240
339
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
340
rc = gpgme_new(&(mc->ctx));
242
341
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
245
345
return false;
246
346
}
247
347
256
356
* Decrypt OpenPGP data.
257
357
* Returns -1 on error
258
358
*/
359
__attribute__((nonnull, warn_unused_result))
259
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
361
size_t crypto_size,
261
char **plaintext){
362
char **plaintext,
363
mandos_context *mc){
262
364
gpgme_data_t dh_crypto, dh_plain;
263
365
gpgme_error_t rc;
264
366
ssize_t ret;
266
368
ssize_t plaintext_length = 0;
267
369
268
370
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
372
}
271
373
272
374
/* Create new GPGME data buffer from memory cryptotext */
273
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
376
0);
275
377
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
278
380
return -1;
279
381
}
280
382
281
383
/* Create new empty GPGME data buffer for the plaintext */
282
384
rc = gpgme_data_new(&dh_plain);
283
385
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
286
389
gpgme_data_release(dh_crypto);
287
390
return -1;
288
391
}
289
392
290
393
/* Decrypt data from the cryptotext data buffer to the plaintext
291
394
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
396
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
296
399
plaintext_length = -1;
297
400
if(debug){
298
401
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
402
result = gpgme_op_decrypt_result(mc->ctx);
300
403
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
405
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
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);
307
410
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
412
}
310
413
gpgme_recipient_t recipient;
311
414
recipient = result->recipients;
312
415
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
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");
319
423
recipient = recipient->next;
320
424
}
321
425
}
324
428
}
325
429
326
430
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
328
432
}
329
433
330
434
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
435
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
436
perror_plus("gpgme_data_seek");
333
437
plaintext_length = -1;
334
438
goto decrypt_end;
335
439
}
337
441
*plaintext = NULL;
338
442
while(true){
339
443
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
341
plaintext_capacity);
444
(size_t)plaintext_length,
445
plaintext_capacity);
342
446
if(plaintext_capacity == 0){
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
346
450
}
347
451
348
452
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
353
457
break;
354
458
}
355
459
if(ret < 0){
356
perror("gpgme_data_read");
460
perror_plus("gpgme_data_read");
357
461
plaintext_length = -1;
358
462
goto decrypt_end;
359
463
}
361
465
}
362
466
363
467
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
468
fprintf_plus(stderr, "Decrypted password is: ");
365
469
for(ssize_t i = 0; i < plaintext_length; i++){
366
470
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
471
}
378
482
return plaintext_length;
379
483
}
380
484
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
384
488
if(ret == NULL)
385
489
ret = "(unknown)";
386
490
return ret;
387
491
}
388
492
389
493
/* GnuTLS log function callback */
494
__attribute__((nonnull))
390
495
static void debuggnutls(__attribute__((unused)) int level,
391
496
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
497
fprintf_plus(stderr, "GnuTLS: %s", string);
393
498
}
394
499
500
__attribute__((nonnull, warn_unused_result))
395
501
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
502
const char *seckeyfilename,
503
mandos_context *mc){
397
504
int ret;
398
505
399
506
if(debug){
400
fprintf(stderr, "Initializing GnuTLS\n");
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
401
508
}
402
509
403
510
ret = gnutls_global_init();
404
511
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
407
514
return -1;
408
515
}
409
516
416
523
}
417
524
418
525
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
420
527
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
426
530
gnutls_global_deinit();
427
531
return -1;
428
532
}
429
533
430
534
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
434
539
}
435
540
436
541
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
542
(mc->cred, pubkeyfilename, seckeyfilename,
438
543
GNUTLS_OPENPGP_FMT_BASE64);
439
544
if(ret != GNUTLS_E_SUCCESS){
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
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));
445
550
goto globalfail;
446
551
}
447
552
448
553
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
554
ret = gnutls_dh_params_init(&mc->dh_params);
450
555
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
453
559
goto globalfail;
454
560
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
456
562
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
459
565
goto globalfail;
460
566
}
461
567
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
569
464
570
return 0;
465
571
466
572
globalfail:
467
573
468
gnutls_certificate_free_credentials(mc.cred);
574
gnutls_certificate_free_credentials(mc->cred);
469
575
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
576
gnutls_dh_params_deinit(mc->dh_params);
471
577
return -1;
472
578
}
473
579
474
static int init_gnutls_session(gnutls_session_t *session){
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
475
583
int ret;
476
584
/* GnuTLS session creation */
477
585
do {
478
586
ret = gnutls_init(session, GNUTLS_SERVER);
587
if(quit_now){
588
return -1;
589
}
479
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
591
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
483
595
}
484
596
485
597
{
486
598
const char *err;
487
599
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
601
if(quit_now){
602
gnutls_deinit(*session);
603
return -1;
604
}
489
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
606
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
494
610
gnutls_deinit(*session);
495
611
return -1;
496
612
}
498
614
499
615
do {
500
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
617
mc->cred);
618
if(quit_now){
619
gnutls_deinit(*session);
620
return -1;
621
}
502
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
623
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
506
626
gnutls_deinit(*session);
507
627
return -1;
508
628
}
510
630
/* ignore client certificate if any. */
511
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
512
632
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
514
634
515
635
return 0;
516
636
}
519
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
520
640
__attribute__((unused)) const char *txt){}
521
641
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
525
642
/* Called when a Mandos server is found */
526
static int start_mandos_communication(const char *ip, uint16_t port,
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
527
645
AvahiIfIndex if_index,
528
int af){
646
int af, mandos_context *mc){
529
647
int ret, tcp_sd = -1;
530
648
ssize_t sret;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
649
struct sockaddr_storage to;
535
650
char *buffer = NULL;
536
char *decrypted_buffer;
651
char *decrypted_buffer = NULL;
537
652
size_t buffer_length = 0;
538
653
size_t buffer_capacity = 0;
539
654
size_t written;
540
int retval = 0;
655
int retval = -1;
541
656
gnutls_session_t session;
542
657
int pf; /* Protocol family */
543
658
659
errno = 0;
660
544
661
if(quit_now){
662
errno = EINTR;
545
663
return -1;
546
664
}
547
665
553
671
pf = PF_INET;
554
672
break;
555
673
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
675
errno = EINVAL;
557
676
return -1;
558
677
}
559
678
560
ret = init_gnutls_session(&session);
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);
561
712
if(ret != 0){
562
713
return -1;
563
714
}
564
715
565
716
if(debug){
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
568
719
}
569
720
570
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
571
722
if(tcp_sd < 0){
572
perror("socket");
573
retval = -1;
723
int e = errno;
724
perror_plus("socket");
725
errno = e;
574
726
goto mandos_end;
575
727
}
576
728
577
729
if(quit_now){
730
errno = EINTR;
578
731
goto mandos_end;
579
732
}
580
733
581
734
memset(&to, 0, sizeof(to));
582
735
if(af == AF_INET6){
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
585
738
} else { /* IPv4 */
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
588
741
}
589
742
if(ret < 0 ){
590
perror("inet_pton");
591
retval = -1;
743
int e = errno;
744
perror_plus("inet_pton");
745
errno = e;
592
746
goto mandos_end;
593
747
}
594
748
if(ret == 0){
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
749
int e = errno;
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
751
errno = e;
597
752
goto mandos_end;
598
753
}
599
754
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
607
758
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
761
errno = EINVAL;
611
762
goto mandos_end;
612
763
}
613
764
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
615
766
}
616
767
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
620
769
}
621
770
622
771
if(quit_now){
772
errno = EINTR;
623
773
goto mandos_end;
624
774
}
625
775
627
777
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
778
char interface[IF_NAMESIZE];
629
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
780
perror_plus("if_indextoname");
631
781
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
634
784
}
635
785
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
638
788
}
639
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
642
791
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
645
796
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
648
801
}
649
if(pcret == NULL){
650
perror("inet_ntop");
651
} else {
652
if(strcmp(addrstr, ip) != 0){
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
654
}
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);
655
808
}
656
809
}
657
810
658
811
if(quit_now){
812
errno = EINTR;
659
813
goto mandos_end;
660
814
}
661
815
662
816
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
664
819
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
666
822
}
667
823
if(ret < 0){
668
perror("connect");
669
retval = -1;
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
670
829
goto mandos_end;
671
830
}
672
831
673
832
if(quit_now){
833
errno = EINTR;
674
834
goto mandos_end;
675
835
}
676
836
679
839
while(true){
680
840
size_t out_size = strlen(out);
681
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
682
out_size - written));
842
out_size - written));
683
843
if(ret == -1){
684
perror("write");
685
retval = -1;
844
int e = errno;
845
perror_plus("write");
846
errno = e;
686
847
goto mandos_end;
687
848
}
688
849
written += (size_t)ret;
698
859
}
699
860
700
861
if(quit_now){
862
errno = EINTR;
701
863
goto mandos_end;
702
864
}
703
865
}
704
866
705
867
if(debug){
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
707
869
}
708
870
709
871
if(quit_now){
872
errno = EINTR;
710
873
goto mandos_end;
711
874
}
712
875
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
714
881
715
882
if(quit_now){
883
errno = EINTR;
716
884
goto mandos_end;
717
885
}
718
886
719
887
do {
720
888
ret = gnutls_handshake(session);
721
889
if(quit_now){
890
errno = EINTR;
722
891
goto mandos_end;
723
892
}
724
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
725
894
726
895
if(ret != GNUTLS_E_SUCCESS){
727
896
if(debug){
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
729
898
gnutls_perror(ret);
730
899
}
731
retval = -1;
900
errno = EPROTO;
732
901
goto mandos_end;
733
902
}
734
903
735
904
/* Read OpenPGP packet that contains the wanted password */
736
905
737
906
if(debug){
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
740
909
}
741
910
742
911
while(true){
743
912
744
913
if(quit_now){
914
errno = EINTR;
745
915
goto mandos_end;
746
916
}
747
917
748
918
buffer_capacity = incbuffer(&buffer, buffer_length,
749
buffer_capacity);
919
buffer_capacity);
750
920
if(buffer_capacity == 0){
751
perror("incbuffer");
752
retval = -1;
921
int e = errno;
922
perror_plus("incbuffer");
923
errno = e;
753
924
goto mandos_end;
754
925
}
755
926
756
927
if(quit_now){
928
errno = EINTR;
757
929
goto mandos_end;
758
930
}
759
931
772
944
ret = gnutls_handshake(session);
773
945
774
946
if(quit_now){
947
errno = EINTR;
775
948
goto mandos_end;
776
949
}
777
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
778
951
if(ret < 0){
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
780
954
gnutls_perror(ret);
781
retval = -1;
955
errno = EPROTO;
782
956
goto mandos_end;
783
957
}
784
958
break;
785
959
default:
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
789
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
errno = EIO;
790
964
goto mandos_end;
791
965
}
792
966
} else {
795
969
}
796
970
797
971
if(debug){
798
fprintf(stderr, "Closing TLS session\n");
799
}
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
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);
810
987
811
988
if(buffer_length > 0){
812
989
ssize_t decrypted_buffer_size;
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
815
&decrypted_buffer);
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
816
992
if(decrypted_buffer_size >= 0){
817
993
818
994
written = 0;
819
995
while(written < (size_t) decrypted_buffer_size){
820
996
if(quit_now){
997
errno = EINTR;
821
998
goto mandos_end;
822
999
}
823
1000
825
1002
(size_t)decrypted_buffer_size - written,
826
1003
stdout);
827
1004
if(ret == 0 and ferror(stdout)){
1005
int e = errno;
828
1006
if(debug){
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
831
1009
}
832
retval = -1;
833
break;
1010
errno = e;
1011
goto mandos_end;
834
1012
}
835
1013
written += (size_t)ret;
836
1014
}
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
1015
retval = 0;
840
1016
}
841
} else {
842
retval = -1;
843
1017
}
844
1018
845
1019
/* Shutdown procedure */
846
1020
847
1021
mandos_end:
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
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
}
858
1041
}
859
1042
return retval;
860
1043
}
861
1044
1045
__attribute__((nonnull))
862
1046
static void resolve_callback(AvahiSServiceResolver *r,
863
1047
AvahiIfIndex interface,
864
1048
AvahiProtocol proto,
872
1056
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
1058
flags,
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
877
1063
878
1064
/* Called whenever a service has been resolved successfully or
879
1065
timed out */
885
1071
switch(event){
886
1072
default:
887
1073
case AVAHI_RESOLVER_FAILURE:
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
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)));
891
1079
break;
892
1080
893
1081
case AVAHI_RESOLVER_FOUND:
895
1083
char ip[AVAHI_ADDRESS_STR_MAX];
896
1084
avahi_address_snprint(ip, sizeof(ip), address);
897
1085
if(debug){
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
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);
901
1089
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
904
1094
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
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
}
906
1103
}
907
1104
}
908
1105
}
918
1115
const char *domain,
919
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
1117
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
923
1122
924
1123
/* Called whenever a new services becomes available on the LAN or
925
1124
is removed from the LAN */
932
1131
default:
933
1132
case AVAHI_BROWSER_FAILURE:
934
1133
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
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);
938
1138
return;
939
1139
940
1140
case AVAHI_BROWSER_NEW:
943
1143
the callback function is called the Avahi server will free the
944
1144
resolver for us. */
945
1145
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
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)));
951
1154
break;
952
1155
953
1156
case AVAHI_BROWSER_REMOVE:
956
1159
case AVAHI_BROWSER_ALL_FOR_NOW:
957
1160
case AVAHI_BROWSER_CACHE_EXHAUSTED:
958
1161
if(debug){
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
960
1164
}
961
1165
break;
962
1166
}
963
1167
}
964
1168
965
/* stop main loop after sigterm has been called */
1169
/* Signal handler that stops main loop after SIGTERM */
966
1170
static void handle_sigterm(int sig){
967
1171
if(quit_now){
968
1172
return;
970
1174
quit_now = 1;
971
1175
signal_received = sig;
972
1176
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_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
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1350
if(ret == -1){
1351
if(debug){
1352
perror_plus("Could not stat hook");
1353
}
1354
return 0;
1355
}
1356
if(not (S_ISREG(st.st_mode))){
1357
/* Not a regular file */
1358
if(debug){
1359
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1360
direntry->d_name);
1361
}
1362
return 0;
1363
}
1364
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1365
/* Not executable */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1368
direntry->d_name);
1369
}
1370
return 0;
1371
}
1372
if(debug){
1373
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1374
direntry->d_name);
1375
}
1376
return 1;
1377
}
1378
1379
__attribute__((nonnull, warn_unused_result))
1380
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1381
mandos_context *mc){
1382
int ret;
1383
struct timespec now;
1384
struct timespec waited_time;
1385
intmax_t block_time;
1386
1387
while(true){
1388
if(mc->current_server == NULL){
1389
if(debug){
1390
fprintf_plus(stderr, "Wait until first server is found."
1391
" No timeout!\n");
1392
}
1393
ret = avahi_simple_poll_iterate(s, -1);
1394
} else {
1395
if(debug){
1396
fprintf_plus(stderr, "Check current_server if we should run"
1397
" it, or wait\n");
1398
}
1399
/* the current time */
1400
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1401
if(ret == -1){
1402
perror_plus("clock_gettime");
1403
return -1;
1404
}
1405
/* Calculating in ms how long time between now and server
1406
who we visted longest time ago. Now - last seen. */
1407
waited_time.tv_sec = (now.tv_sec
1408
- mc->current_server->last_seen.tv_sec);
1409
waited_time.tv_nsec = (now.tv_nsec
1410
- mc->current_server->last_seen.tv_nsec);
1411
/* total time is 10s/10,000ms.
1412
Converting to s from ms by dividing by 1,000,
1413
and ns to ms by dividing by 1,000,000. */
1414
block_time = ((retry_interval
1415
- ((intmax_t)waited_time.tv_sec * 1000))
1416
- ((intmax_t)waited_time.tv_nsec / 1000000));
1417
1418
if(debug){
1419
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1420
block_time);
1421
}
1422
1423
if(block_time <= 0){
1424
ret = start_mandos_communication(mc->current_server->ip,
1425
mc->current_server->port,
1426
mc->current_server->if_index,
1427
mc->current_server->af, mc);
1428
if(ret == 0){
1429
avahi_simple_poll_quit(s);
1430
return 0;
1431
}
1432
ret = clock_gettime(CLOCK_MONOTONIC,
1433
&mc->current_server->last_seen);
1434
if(ret == -1){
1435
perror_plus("clock_gettime");
1436
return -1;
1437
}
1438
mc->current_server = mc->current_server->next;
1439
block_time = 0; /* Call avahi to find new Mandos
1440
servers, but don't block */
1441
}
1442
1443
ret = avahi_simple_poll_iterate(s, (int)block_time);
1444
}
1445
if(ret != 0){
1446
if(ret > 0 or errno != EINTR){
1447
return (ret != 1) ? ret : 0;
1448
}
1449
}
1450
}
1451
}
1452
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1459
ret_errno = errno;
1460
perror_plus("seteuid");
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
perror_plus("seteuid");
1478
}
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1489
ret_errno = errno;
1490
perror_plus("seteuid");
1491
}
1492
errno = old_errno;
1493
return ret_errno;
1494
}
1495
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1502
ret_errno = errno;
1503
perror_plus("setuid");
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
#ifndef O_CLOEXEC
1510
/*
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1514
*/
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1519
if(ret < 0){
1520
return ret;
1521
}
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1524
ret | FD_CLOEXEC));
1525
}
1526
#endif /* not O_CLOEXEC */
1527
1528
__attribute__((nonnull))
1529
void run_network_hooks(const char *mode, const char *interface,
1530
const float delay){
1531
struct dirent **direntries;
1532
if(hookdir_fd == -1){
1533
hookdir_fd = open(hookdir, O_RDONLY |
1534
#ifdef O_CLOEXEC
1535
O_CLOEXEC
1536
#else /* not O_CLOEXEC */
1537
0
1538
#endif /* not O_CLOEXEC */
1539
);
1540
if(hookdir_fd == -1){
1541
if(errno == ENOENT){
1542
if(debug){
1543
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1544
" found\n", hookdir);
1545
}
1546
} else {
1547
perror_plus("open");
1548
}
1549
return;
1550
}
1551
#ifndef O_CLOEXEC
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1556
} else {
1557
hookdir_fd = -1;
1558
}
1559
return;
1560
}
1561
#endif /* not O_CLOEXEC */
1562
}
1563
#ifdef __GLIBC__
1564
#if __GLIBC_PREREQ(2, 15)
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1569
alphasort);
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1573
alphasort);
1574
#endif /* not __GLIBC__ */
1575
if(numhooks == -1){
1576
perror_plus("scandir");
1577
return;
1578
}
1579
struct dirent *direntry;
1580
int ret;
1581
int devnull = open("/dev/null", O_RDONLY);
1582
for(int i = 0; i < numhooks; i++){
1583
direntry = direntries[i];
1584
if(debug){
1585
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1586
direntry->d_name);
1587
}
1588
pid_t hook_pid = fork();
1589
if(hook_pid == 0){
1590
/* Child */
1591
/* Raise privileges */
1592
if(raise_privileges_permanently() != 0){
1593
perror_plus("Failed to raise privileges");
1594
_exit(EX_NOPERM);
1595
}
1596
/* Set group */
1597
errno = 0;
1598
ret = setgid(0);
1599
if(ret == -1){
1600
perror_plus("setgid");
1601
_exit(EX_NOPERM);
1602
}
1603
/* Reset supplementary groups */
1604
errno = 0;
1605
ret = setgroups(0, NULL);
1606
if(ret == -1){
1607
perror_plus("setgroups");
1608
_exit(EX_NOPERM);
1609
}
1610
ret = dup2(devnull, STDIN_FILENO);
1611
if(ret == -1){
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1613
_exit(EX_OSERR);
1614
}
1615
ret = close(devnull);
1616
if(ret == -1){
1617
perror_plus("close");
1618
_exit(EX_OSERR);
1619
}
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1621
if(ret == -1){
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1623
_exit(EX_OSERR);
1624
}
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1626
if(ret == -1){
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
ret = setenv("DEVICE", interface, 1);
1631
if(ret == -1){
1632
perror_plus("setenv");
1633
_exit(EX_OSERR);
1634
}
1635
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
_exit(EX_OSERR);
1639
}
1640
ret = setenv("MODE", mode, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
_exit(EX_OSERR);
1644
}
1645
char *delaystring;
1646
ret = asprintf(&delaystring, "%f", (double)delay);
1647
if(ret == -1){
1648
perror_plus("asprintf");
1649
_exit(EX_OSERR);
1650
}
1651
ret = setenv("DELAY", delaystring, 1);
1652
if(ret == -1){
1653
free(delaystring);
1654
perror_plus("setenv");
1655
_exit(EX_OSERR);
1656
}
1657
free(delaystring);
1658
if(connect_to != NULL){
1659
ret = setenv("CONNECT", connect_to, 1);
1660
if(ret == -1){
1661
perror_plus("setenv");
1662
_exit(EX_OSERR);
1663
}
1664
}
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
1667
perror_plus("fexecve");
1668
_exit(EXIT_FAILURE);
1669
}
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
continue;
1675
}
1676
if(WIFEXITED(status)){
1677
if(WEXITSTATUS(status) != 0){
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1679
" with status %d\n", direntry->d_name,
1680
WEXITSTATUS(status));
1681
continue;
1682
}
1683
} else if(WIFSIGNALED(status)){
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1685
" signal %d\n", direntry->d_name,
1686
WTERMSIG(status));
1687
continue;
1688
} else {
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
1690
" crashed\n", direntry->d_name);
1691
continue;
1692
}
1693
}
1694
if(debug){
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1696
direntry->d_name);
1697
}
1698
}
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1700
perror_plus("close");
1701
} else {
1702
hookdir_fd = -1;
1703
}
1704
close(devnull);
1705
}
1706
1707
__attribute__((nonnull, warn_unused_result))
1708
error_t bring_up_interface(const char *const interface,
1709
const float delay){
1710
error_t old_errno = errno;
1711
int ret;
1712
struct ifreq network;
1713
unsigned int if_index = if_nametoindex(interface);
1714
if(if_index == 0){
1715
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1716
errno = old_errno;
1717
return ENXIO;
1718
}
1719
1720
if(quit_now){
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(not interface_is_up(interface)){
1726
error_t ret_errno = 0, ioctl_errno = 0;
1727
if(not get_flags(interface, &network)){
1728
ret_errno = errno;
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
network.ifr_flags |= IFF_UP; /* set flag */
1735
1736
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1737
if(sd == -1){
1738
ret_errno = errno;
1739
perror_plus("socket");
1740
errno = old_errno;
1741
return ret_errno;
1742
}
1743
1744
if(quit_now){
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1746
if(ret == -1){
1747
perror_plus("close");
1748
}
1749
errno = old_errno;
1750
return EINTR;
1751
}
1752
1753
if(debug){
1754
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1755
interface);
1756
}
1757
1758
/* Raise privileges */
1759
ret_errno = raise_privileges();
1760
if(ret_errno != 0){
1761
perror_plus("Failed to raise privileges");
1762
}
1763
1764
#ifdef __linux__
1765
int ret_linux;
1766
bool restore_loglevel = false;
1767
if(ret_errno == 0){
1768
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1769
messages about the network interface to mess up the prompt */
1770
ret_linux = klogctl(8, NULL, 5);
1771
if(ret_linux == -1){
1772
perror_plus("klogctl");
1773
} else {
1774
restore_loglevel = true;
1775
}
1776
}
1777
#endif /* __linux__ */
1778
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1779
ioctl_errno = errno;
1780
#ifdef __linux__
1781
if(restore_loglevel){
1782
ret_linux = klogctl(7, NULL, 0);
1783
if(ret_linux == -1){
1784
perror_plus("klogctl");
1785
}
1786
}
1787
#endif /* __linux__ */
1788
1789
/* If raise_privileges() succeeded above */
1790
if(ret_errno == 0){
1791
/* Lower privileges */
1792
ret_errno = lower_privileges();
1793
if(ret_errno != 0){
1794
errno = ret_errno;
1795
perror_plus("Failed to lower privileges");
1796
}
1797
}
1798
1799
/* Close the socket */
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1801
if(ret == -1){
1802
perror_plus("close");
1803
}
1804
1805
if(ret_setflags == -1){
1806
errno = ioctl_errno;
1807
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1808
errno = old_errno;
1809
return ioctl_errno;
1810
}
1811
} else if(debug){
1812
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1813
interface);
1814
}
1815
1816
/* Sleep checking until interface is running.
1817
Check every 0.25s, up to total time of delay */
1818
for(int i=0; i < delay * 4; i++){
1819
if(interface_is_running(interface)){
1820
break;
1821
}
1822
struct timespec sleeptime = { .tv_nsec = 250000000 };
1823
ret = nanosleep(&sleeptime, NULL);
1824
if(ret == -1 and errno != EINTR){
1825
perror_plus("nanosleep");
1826
}
1827
}
1828
1829
errno = old_errno;
1830
return 0;
1831
}
1832
1833
__attribute__((nonnull, warn_unused_result))
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
1836
struct ifreq network;
1837
unsigned int if_index = if_nametoindex(interface);
1838
if(if_index == 0){
1839
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1840
errno = old_errno;
1841
return ENXIO;
1842
}
1843
if(interface_is_up(interface)){
1844
error_t ret_errno = 0, ioctl_errno = 0;
1845
if(not get_flags(interface, &network) and debug){
1846
ret_errno = errno;
1847
fprintf_plus(stderr, "Failed to get flags for interface "
1848
"\"%s\"\n", interface);
1849
errno = old_errno;
1850
return ret_errno;
1851
}
1852
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1853
1854
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1855
if(sd == -1){
1856
ret_errno = errno;
1857
perror_plus("socket");
1858
errno = old_errno;
1859
return ret_errno;
1860
}
1861
1862
if(debug){
1863
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1864
interface);
1865
}
1866
1867
/* Raise privileges */
1868
ret_errno = raise_privileges();
1869
if(ret_errno != 0){
1870
perror_plus("Failed to raise privileges");
1871
}
1872
1873
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1874
ioctl_errno = errno;
1875
1876
/* If raise_privileges() succeeded above */
1877
if(ret_errno == 0){
1878
/* Lower privileges */
1879
ret_errno = lower_privileges();
1880
if(ret_errno != 0){
1881
errno = ret_errno;
1882
perror_plus("Failed to lower privileges");
1883
}
1884
}
1885
1886
/* Close the socket */
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1888
if(ret == -1){
1889
perror_plus("close");
1890
}
1891
1892
if(ret_setflags == -1){
1893
errno = ioctl_errno;
1894
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1895
errno = old_errno;
1896
return ioctl_errno;
1897
}
1898
} else if(debug){
1899
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1900
interface);
1901
}
1902
1903
errno = old_errno;
1904
return 0;
977
1905
}
978
1906
979
1907
int main(int argc, char *argv[]){
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
980
1912
AvahiSServiceBrowser *sb = NULL;
981
int error;
1913
error_t ret_errno;
982
1914
int ret;
983
1915
intmax_t tmpmax;
984
1916
char *tmp;
985
1917
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
1918
char *interfaces_to_take_down = NULL;
1919
size_t interfaces_to_take_down_size = 0;
1920
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1921
char old_tempdir[] = "/tmp/mandosXXXXXX";
1922
char *tempdir = NULL;
995
1923
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
1924
const char *seckey = PATHDIR "/" SECKEY;
997
1925
const char *pubkey = PATHDIR "/" PUBKEY;
1926
char *interfaces_hooks = NULL;
998
1927
999
1928
bool gnutls_initialized = false;
1000
1929
bool gpgme_initialized = false;
1001
1930
float delay = 2.5f;
1931
double retry_interval = 10; /* 10s between trying a server and
1932
retrying the same server again */
1002
1933
1003
1934
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1004
1935
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1010
1941
errno = 0;
1011
1942
ret = setgid(gid);
1012
1943
if(ret == -1){
1013
perror("setgid");
1944
perror_plus("setgid");
1014
1945
}
1015
1946
1016
1947
/* Lower user privileges (temporarily) */
1017
1948
errno = 0;
1018
1949
ret = seteuid(uid);
1019
1950
if(ret == -1){
1020
perror("seteuid");
1951
perror_plus("seteuid");
1021
1952
}
1022
1953
1023
1954
if(quit_now){
1058
1989
.arg = "SECONDS",
1059
1990
.doc = "Maximum delay to wait for interface startup",
1060
1991
.group = 2 },
1992
{ .name = "retry", .key = 132,
1993
.arg = "SECONDS",
1994
.doc = "Retry interval used when denied by the Mandos server",
1995
.group = 2 },
1996
{ .name = "network-hook-dir", .key = 133,
1997
.arg = "DIR",
1998
.doc = "Directory where network hooks are located",
1999
.group = 2 },
2000
/*
2001
* These reproduce what we would get without ARGP_NO_HELP
2002
*/
2003
{ .name = "help", .key = '?',
2004
.doc = "Give this help list", .group = -1 },
2005
{ .name = "usage", .key = -3,
2006
.doc = "Give a short usage message", .group = -1 },
2007
{ .name = "version", .key = 'V',
2008
.doc = "Print program version", .group = -1 },
1061
2009
{ .name = NULL }
1062
2010
};
1063
2011
1064
2012
error_t parse_opt(int key, char *arg,
1065
2013
struct argp_state *state){
2014
errno = 0;
1066
2015
switch(key){
1067
2016
case 128: /* --debug */
1068
2017
debug = true;
1071
2020
connect_to = arg;
1072
2021
break;
1073
2022
case 'i': /* --interface */
1074
interface = arg;
2023
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2024
arg, (int)',');
2025
if(ret_errno != 0){
2026
argp_error(state, "%s", strerror(ret_errno));
2027
}
1075
2028
break;
1076
2029
case 's': /* --seckey */
1077
2030
seckey = arg;
1084
2037
tmpmax = strtoimax(arg, &tmp, 10);
1085
2038
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
2039
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
2040
argp_error(state, "Bad number of DH bits");
1089
2041
}
1090
2042
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1091
2043
break;
1096
2048
errno = 0;
1097
2049
delay = strtof(arg, &tmp);
1098
2050
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
2051
argp_error(state, "Bad delay");
2052
}
2053
case 132: /* --retry */
2054
errno = 0;
2055
retry_interval = strtod(arg, &tmp);
2056
if(errno != 0 or tmp == arg or *tmp != '\0'
2057
or (retry_interval * 1000) > INT_MAX
2058
or retry_interval < 0){
2059
argp_error(state, "Bad retry interval");
2060
}
2061
break;
2062
case 133: /* --network-hook-dir */
2063
hookdir = arg;
2064
break;
2065
/*
2066
* These reproduce what we would get without ARGP_NO_HELP
2067
*/
2068
case '?': /* --help */
2069
argp_state_help(state, state->out_stream,
2070
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2071
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2072
case -3: /* --usage */
2073
argp_state_help(state, state->out_stream,
2074
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2075
case 'V': /* --version */
2076
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2077
exit(argp_err_exit_status);
1106
2078
break;
1107
2079
default:
1108
2080
return ARGP_ERR_UNKNOWN;
1109
2081
}
1110
return 0;
2082
return errno;
1111
2083
}
1112
2084
1113
2085
struct argp argp = { .options = options, .parser = parse_opt,
1114
2086
.args_doc = "",
1115
2087
.doc = "Mandos client -- Get and decrypt"
1116
2088
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
2089
ret = argp_parse(&argp, argc, argv,
2090
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2091
switch(ret){
2092
case 0:
2093
break;
2094
case ENOMEM:
2095
default:
2096
errno = ret;
2097
perror_plus("argp_parse");
2098
exitcode = EX_OSERR;
2099
goto end;
2100
case EINVAL:
2101
exitcode = EX_USAGE;
2102
goto end;
2103
}
2104
}
2105
2106
{
2107
/* Work around Debian bug #633582:
2108
<http://bugs.debian.org/633582> */
2109
2110
/* Re-raise privileges */
2111
ret_errno = raise_privileges();
2112
if(ret_errno != 0){
2113
errno = ret_errno;
2114
perror_plus("Failed to raise privileges");
2115
} else {
2116
struct stat st;
2117
2118
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2119
int seckey_fd = open(seckey, O_RDONLY);
2120
if(seckey_fd == -1){
2121
perror_plus("open");
2122
} else {
2123
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2124
if(ret == -1){
2125
perror_plus("fstat");
2126
} else {
2127
if(S_ISREG(st.st_mode)
2128
and st.st_uid == 0 and st.st_gid == 0){
2129
ret = fchown(seckey_fd, uid, gid);
2130
if(ret == -1){
2131
perror_plus("fchown");
2132
}
2133
}
2134
}
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2136
}
2137
}
2138
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2141
if(pubkey_fd == -1){
2142
perror_plus("open");
2143
} else {
2144
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2145
if(ret == -1){
2146
perror_plus("fstat");
2147
} else {
2148
if(S_ISREG(st.st_mode)
2149
and st.st_uid == 0 and st.st_gid == 0){
2150
ret = fchown(pubkey_fd, uid, gid);
2151
if(ret == -1){
2152
perror_plus("fchown");
2153
}
2154
}
2155
}
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2157
}
2158
}
2159
2160
/* Lower privileges */
2161
ret_errno = lower_privileges();
2162
if(ret_errno != 0){
2163
errno = ret_errno;
2164
perror_plus("Failed to lower privileges");
2165
}
2166
}
2167
}
2168
2169
/* Remove invalid interface names (except "none") */
2170
{
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
if(strcmp(interface, "none") != 0
2175
and if_nametoindex(interface) == 0){
2176
if(interface[0] != '\0'){
2177
fprintf_plus(stderr, "Not using nonexisting interface"
2178
" \"%s\"\n", interface);
2179
}
2180
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2181
interface = NULL;
2182
}
2183
}
2184
}
2185
2186
/* Run network hooks */
2187
{
2188
if(mc.interfaces != NULL){
2189
interfaces_hooks = malloc(mc.interfaces_size);
2190
if(interfaces_hooks == NULL){
2191
perror_plus("malloc");
2192
goto end;
2193
}
2194
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2195
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2196
}
2197
run_network_hooks("start", interfaces_hooks != NULL ?
2198
interfaces_hooks : "", delay);
1123
2199
}
1124
2200
1125
2201
if(not debug){
1130
2206
from the signal handler */
1131
2207
/* Initialize the pseudo-RNG for Avahi */
1132
2208
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
2209
simple_poll = avahi_simple_poll_new();
2210
if(simple_poll == NULL){
2211
fprintf_plus(stderr,
2212
"Avahi: Failed to create simple poll object.\n");
2213
exitcode = EX_UNAVAILABLE;
1137
2214
goto end;
1138
2215
}
1139
2216
1140
2217
sigemptyset(&sigterm_action.sa_mask);
1141
2218
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
2219
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
2220
perror_plus("sigaddset");
2221
exitcode = EX_OSERR;
1145
2222
goto end;
1146
2223
}
1147
2224
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
2225
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
2226
perror_plus("sigaddset");
2227
exitcode = EX_OSERR;
1151
2228
goto end;
1152
2229
}
1153
2230
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
2231
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
2232
perror_plus("sigaddset");
2233
exitcode = EX_OSERR;
1157
2234
goto end;
1158
2235
}
1159
2236
/* Need to check if the handler is SIG_IGN before handling:
1162
2239
*/
1163
2240
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1164
2241
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2242
perror_plus("sigaction");
2243
return EX_OSERR;
1167
2244
}
1168
2245
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
2246
ret = sigaction(SIGINT, &sigterm_action, NULL);
1170
2247
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
1173
2250
goto end;
1174
2251
}
1175
2252
}
1176
2253
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
2254
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
2255
perror_plus("sigaction");
2256
return EX_OSERR;
1180
2257
}
1181
2258
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
2259
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
2260
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
2261
perror_plus("sigaction");
2262
exitcode = EX_OSERR;
1186
2263
goto end;
1187
2264
}
1188
2265
}
1189
2266
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1190
2267
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2268
perror_plus("sigaction");
2269
return EX_OSERR;
1193
2270
}
1194
2271
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
2272
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1196
2273
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
if(if_index == 0){
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
2274
perror_plus("sigaction");
2275
exitcode = EX_OSERR;
2276
goto end;
2277
}
2278
}
2279
2280
/* If no interfaces were specified, make a list */
2281
if(mc.interfaces == NULL){
2282
struct dirent **direntries;
2283
/* Look for any good interfaces */
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2285
alphasort);
2286
if(ret >= 1){
2287
/* Add all found interfaces to interfaces list */
2288
for(int i = 0; i < ret; ++i){
2289
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2290
direntries[i]->d_name);
2291
if(ret_errno != 0){
2292
errno = ret_errno;
2293
perror_plus("argz_add");
2294
continue;
2295
}
2296
if(debug){
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2298
direntries[i]->d_name);
2299
}
2300
}
2301
free(direntries);
2302
} else {
2303
free(direntries);
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2305
exitcode = EXIT_FAILURE;
2306
goto end;
2307
}
2308
}
2309
2310
/* Bring up interfaces which are down, and remove any "none"s */
2311
{
2312
char *interface = NULL;
2313
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2314
interface))){
2315
/* If interface name is "none", stop bringing up interfaces.
2316
Also remove all instances of "none" from the list */
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
2321
while((interface = argz_next(mc.interfaces,
2322
mc.interfaces_size, interface))){
2323
if(strcmp(interface, "none") == 0){
2324
argz_delete(&mc.interfaces, &mc.interfaces_size,
2325
interface);
2326
interface = NULL;
1288
2327
}
1289
2328
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
2329
break;
1307
2330
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
2331
bool interface_was_up = interface_is_up(interface);
2332
errno = bring_up_interface(interface, delay);
2333
if(not interface_was_up){
2334
if(errno != 0){
2335
perror_plus("Failed to bring up interface");
2336
} else {
2337
errno = argz_add(&interfaces_to_take_down,
2338
&interfaces_to_take_down_size,
2339
interface);
2340
if(errno != 0){
2341
perror_plus("argz_add");
2342
}
2343
}
2344
}
2345
}
2346
if(debug and (interfaces_to_take_down == NULL)){
2347
fprintf_plus(stderr, "No interfaces were brought up\n");
2348
}
2349
}
2350
2351
/* If we only got one interface, explicitly use only that one */
2352
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2353
if(debug){
2354
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2355
mc.interfaces);
2356
}
2357
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1345
2358
}
1346
2359
1347
2360
if(quit_now){
1348
2361
goto end;
1349
2362
}
1350
2363
1351
ret = init_gnutls_global(pubkey, seckey);
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
1352
2365
if(ret == -1){
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
2367
exitcode = EX_UNAVAILABLE;
1355
2368
goto end;
1356
2369
} else {
1357
2370
gnutls_initialized = true;
1361
2374
goto end;
1362
2375
}
1363
2376
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
2377
/* Try /run/tmp before /tmp */
2378
tempdir = mkdtemp(run_tempdir);
2379
if(tempdir == NULL and errno == ENOENT){
2380
if(debug){
2381
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2382
run_tempdir, old_tempdir);
2383
}
2384
tempdir = mkdtemp(old_tempdir);
2385
}
2386
if(tempdir == NULL){
2387
perror_plus("mkdtemp");
1368
2388
goto end;
1369
2389
}
1370
2390
1372
2392
goto end;
1373
2393
}
1374
2394
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2395
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2396
fprintf_plus(stderr, "init_gpgme failed\n");
2397
exitcode = EX_UNAVAILABLE;
1378
2398
goto end;
1379
2399
} else {
1380
2400
gpgme_initialized = true;
1388
2408
/* Connect directly, do not use Zeroconf */
1389
2409
/* (Mainly meant for debugging) */
1390
2410
char *address = strrchr(connect_to, ':');
2411
1391
2412
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2413
fprintf_plus(stderr, "No colon in address\n");
2414
exitcode = EX_USAGE;
1394
2415
goto end;
1395
2416
}
1396
2417
1398
2419
goto end;
1399
2420
}
1400
2421
1401
uint16_t port;
2422
in_port_t port;
1402
2423
errno = 0;
1403
2424
tmpmax = strtoimax(address+1, &tmp, 10);
1404
2425
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2426
or tmpmax != (in_port_t)tmpmax){
2427
fprintf_plus(stderr, "Bad port number\n");
2428
exitcode = EX_USAGE;
1408
2429
goto end;
1409
2430
}
1410
2431
1411
2432
if(quit_now){
1412
2433
goto end;
1413
2434
}
1414
2435
1415
port = (uint16_t)tmpmax;
2436
port = (in_port_t)tmpmax;
1416
2437
*address = '\0';
1417
address = connect_to;
1418
2438
/* Colon in address indicates IPv6 */
1419
2439
int af;
1420
if(strchr(address, ':') != NULL){
2440
if(strchr(connect_to, ':') != NULL){
1421
2441
af = AF_INET6;
2442
/* Accept [] around IPv6 address - see RFC 5952 */
2443
if(connect_to[0] == '[' and address[-1] == ']')
2444
{
2445
connect_to++;
2446
address[-1] = '\0';
2447
}
1422
2448
} else {
1423
2449
af = AF_INET;
1424
2450
}
2451
address = connect_to;
1425
2452
1426
2453
if(quit_now){
1427
2454
goto end;
1428
2455
}
1429
2456
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
2457
while(not quit_now){
2458
ret = start_mandos_communication(address, port, if_index, af,
2459
&mc);
2460
if(quit_now or ret == 0){
2461
break;
2462
}
2463
if(debug){
2464
fprintf_plus(stderr, "Retrying in %d seconds\n",
2465
(int)retry_interval);
2466
}
2467
sleep((unsigned int)retry_interval);
2468
}
2469
2470
if(not quit_now){
1434
2471
exitcode = EXIT_SUCCESS;
1435
2472
}
2473
1436
2474
goto end;
1437
2475
}
1438
2476
1450
2488
config.publish_domain = 0;
1451
2489
1452
2490
/* Allocate a new server */
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2492
&config, NULL, NULL, &ret_errno);
1456
2493
1457
2494
/* Free the Avahi configuration data */
1458
2495
avahi_server_config_free(&config);
1460
2497
1461
2498
/* Check if creating the Avahi server object succeeded */
1462
2499
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2501
avahi_strerror(ret_errno));
2502
exitcode = EX_UNAVAILABLE;
1466
2503
goto end;
1467
2504
}
1468
2505
1473
2510
/* Create the Avahi service browser */
1474
2511
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
2512
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
2513
NULL, 0, browse_callback,
2514
(void *)&mc);
1477
2515
if(sb == NULL){
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
2516
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2517
avahi_strerror(avahi_server_errno(mc.server)));
2518
exitcode = EX_UNAVAILABLE;
1481
2519
goto end;
1482
2520
}
1483
2521
1488
2526
/* Run the main loop */
1489
2527
1490
2528
if(debug){
1491
fprintf(stderr, "Starting Avahi loop search\n");
2529
fprintf_plus(stderr, "Starting Avahi loop search\n");
1492
2530
}
1493
2531
1494
avahi_simple_poll_loop(mc.simple_poll);
2532
ret = avahi_loop_with_timeout(simple_poll,
2533
(int)(retry_interval * 1000), &mc);
2534
if(debug){
2535
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2536
(ret == 0) ? "successfully" : "with error");
2537
}
1495
2538
1496
2539
end:
1497
2540
1498
2541
if(debug){
1499
fprintf(stderr, "%s exiting\n", argv[0]);
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1500
2543
}
1501
2544
1502
2545
/* Cleanup things */
2546
free(mc.interfaces);
2547
1503
2548
if(sb != NULL)
1504
2549
avahi_s_service_browser_free(sb);
1505
2550
1506
2551
if(mc.server != NULL)
1507
2552
avahi_server_free(mc.server);
1508
2553
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
2554
if(simple_poll != NULL)
2555
avahi_simple_poll_free(simple_poll);
1511
2556
1512
2557
if(gnutls_initialized){
1513
2558
gnutls_certificate_free_credentials(mc.cred);
1519
2564
gpgme_release(mc.ctx);
1520
2565
}
1521
2566
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
2567
/* Cleans up the circular linked list of Mandos servers the client
2568
has seen */
2569
if(mc.current_server != NULL){
2570
mc.current_server->prev->next = NULL;
2571
while(mc.current_server != NULL){
2572
server *next = mc.current_server->next;
2573
free(mc.current_server);
2574
mc.current_server = next;
1551
2575
}
1552
2576
}
1553
2577
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
2578
/* Re-raise privileges */
2579
{
2580
ret_errno = raise_privileges();
2581
if(ret_errno != 0){
2582
perror_plus("Failed to raise privileges");
1563
2583
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
2584
2585
/* Run network hooks */
2586
run_network_hooks("stop", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2588
2589
/* Take down the network interfaces which were brought up */
2590
{
2591
char *interface = NULL;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2594
interface))){
2595
ret_errno = take_down_interface(interface);
2596
if(ret_errno != 0){
2597
errno = ret_errno;
2598
perror_plus("Failed to take down interface");
2599
}
2600
}
2601
if(debug and (interfaces_to_take_down == NULL)){
2602
fprintf_plus(stderr, "No interfaces needed to be taken"
2603
" down\n");
2604
}
2605
}
2606
}
2607
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
2610
perror_plus("Failed to lower privileges permanently");
2611
}
2612
}
2613
2614
free(interfaces_to_take_down);
2615
free(interfaces_hooks);
2616
2617
/* Removes the GPGME temp directory and all files inside */
2618
if(tempdir != NULL){
2619
struct dirent **direntries = NULL;
2620
struct dirent *direntry = NULL;
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2622
alphasort);
2623
if(numentries > 0){
2624
for(int i = 0; i < numentries; i++){
2625
direntry = direntries[i];
1576
2626
char *fullname = NULL;
1577
2627
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
2628
direntry->d_name);
1579
2629
if(ret < 0){
1580
perror("asprintf");
2630
perror_plus("asprintf");
1581
2631
continue;
1582
2632
}
1583
2633
ret = remove(fullname);
1584
2634
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2636
strerror(errno));
1587
2637
}
1588
2638
free(fullname);
1589
2639
}
1590
closedir(d);
2640
}
2641
2642
/* need to clean even if 0 because man page doesn't specify */
2643
free(direntries);
2644
if(numentries == -1){
2645
perror_plus("scandir");
1591
2646
}
1592
2647
ret = rmdir(tempdir);
1593
2648
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
2649
perror_plus("rmdir");
1595
2650
}
1596
2651
}
1597
2652
1598
2653
if(quit_now){
1599
2654
sigemptyset(&old_sigterm_action.sa_mask);
1600
2655
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2656
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2657
&old_sigterm_action,
2658
NULL));
1602
2659
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
2660
perror_plus("sigaction");
2661
}
2662
do {
2663
ret = raise(signal_received);
2664
} while(ret != 0 and errno == EINTR);
2665
if(ret != 0){
2666
perror_plus("raise");
2667
abort();
2668
}
2669
TEMP_FAILURE_RETRY(pause());
1606
2670
}
1607
2671
1608
2672
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0