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- Committer: Teddy Hogeborn
- Date: 2009-10-25 19:16:56 UTC
- Revision ID: teddy@fukt.bsnet.se-20091025191656-zc9xzphyanlr88hq
Tags: version-1.0.14-1
* Makefile (version): Changed to "1.0.14".
* NEWS (Version 1.0.14): New entry.
* debian/changelog (1.0.14-1): - '' -
* NEWS (Version 1.0.14): New entry.
* debian/changelog (1.0.14-1): - '' -
- 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
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
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(), 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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
84
82
#include <signal.h> /* sigemptyset(), sigaddset(),
85
83
sigaction(), SIGTERM, sig_atomic_t,
86
84
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
85
99
86
#ifdef __linux__
100
87
#include <sys/klog.h> /* klogctl() */
118
105
init_gnutls_session(),
119
106
GNUTLS_* */
120
107
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
123
110
124
111
/* GPGME */
125
112
#include <gpgme.h> /* All GPGME types, constants and
133
120
#define PATHDIR "/conf/conf.d/mandos"
134
121
#define SECKEY "seckey.txt"
135
122
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
123
138
124
bool debug = false;
139
125
static const char mandos_protocol_version[] = "1";
140
126
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
128
160
129
/* Used for passing in values through the Avahi callback functions */
161
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
162
132
AvahiServer *server;
163
133
gnutls_certificate_credentials_t cred;
164
134
unsigned int dh_bits;
165
135
gnutls_dh_params_t dh_params;
166
136
const char *priority;
167
137
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
138
} mandos_context;
172
139
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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" };
175
144
176
145
sig_atomic_t quit_now = 0;
177
146
int signal_received = 0;
178
147
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
148
/*
199
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
150
* bytes. "buffer_capacity" is how much is currently allocated,
201
151
* "buffer_length" is how much is already used.
202
152
*/
203
__attribute__((nonnull, warn_unused_result))
204
153
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
154
size_t buffer_capacity){
206
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
if(buffer == NULL){
213
158
return 0;
214
159
}
215
*buffer = new_buf;
216
160
buffer_capacity += BUFFER_SIZE;
217
161
}
218
162
return buffer_capacity;
219
163
}
220
164
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
/* Special case of first server */
245
if(*current_server == NULL){
246
new_server->next = new_server;
247
new_server->prev = new_server;
248
*current_server = new_server;
249
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
253
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
257
}
258
259
165
/*
260
166
* Initialize GPGME.
261
167
*/
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
267
170
gpgme_error_t rc;
268
171
gpgme_engine_info_t engine_info;
269
172
173
270
174
/*
271
175
* Helper function to insert pub and seckey to the engine keyring.
272
176
*/
273
bool import_key(const char * const filename){
177
bool import_key(const char *filename){
274
178
int ret;
275
179
int fd;
276
180
gpgme_data_t pgp_data;
277
181
278
182
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
279
183
if(fd == -1){
280
perror_plus("open");
184
perror("open");
281
185
return false;
282
186
}
283
187
284
188
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
189
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
288
192
return false;
289
193
}
290
194
291
rc = gpgme_op_import(mc->ctx, pgp_data);
195
rc = gpgme_op_import(mc.ctx, pgp_data);
292
196
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
295
199
return false;
296
200
}
297
201
298
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
299
203
if(ret == -1){
300
perror_plus("close");
204
perror("close");
301
205
}
302
206
gpgme_data_release(pgp_data);
303
207
return true;
304
208
}
305
209
306
210
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
211
fprintf(stderr, "Initializing GPGME\n");
308
212
}
309
213
310
214
/* Init GPGME */
311
215
gpgme_check_version(NULL);
312
216
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
313
217
if(rc != GPG_ERR_NO_ERROR){
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
316
220
return false;
317
221
}
318
222
319
/* Set GPGME home directory for the OpenPGP engine only */
223
/* Set GPGME home directory for the OpenPGP engine only */
320
224
rc = gpgme_get_engine_info(&engine_info);
321
225
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
324
228
return false;
325
229
}
326
230
while(engine_info != NULL){
332
236
engine_info = engine_info->next;
333
237
}
334
238
if(engine_info == NULL){
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
337
240
return false;
338
241
}
339
242
340
243
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
244
rc = gpgme_new(&(mc.ctx));
342
245
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
346
248
return false;
347
249
}
348
250
357
259
* Decrypt OpenPGP data.
358
260
* Returns -1 on error
359
261
*/
360
__attribute__((nonnull, warn_unused_result))
361
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
263
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
264
char **plaintext){
365
265
gpgme_data_t dh_crypto, dh_plain;
366
266
gpgme_error_t rc;
367
267
ssize_t ret;
369
269
ssize_t plaintext_length = 0;
370
270
371
271
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
373
273
}
374
274
375
275
/* Create new GPGME data buffer from memory cryptotext */
376
276
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
377
277
0);
378
278
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
381
281
return -1;
382
282
}
383
283
384
284
/* Create new empty GPGME data buffer for the plaintext */
385
285
rc = gpgme_data_new(&dh_plain);
386
286
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
390
289
gpgme_data_release(dh_crypto);
391
290
return -1;
392
291
}
393
292
394
293
/* Decrypt data from the cryptotext data buffer to the plaintext
395
294
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
296
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
400
299
plaintext_length = -1;
401
300
if(debug){
402
301
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
302
result = gpgme_op_decrypt_result(mc.ctx);
404
303
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
406
305
} else {
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
411
310
if(result->file_name != NULL){
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
311
fprintf(stderr, "File name: %s\n", result->file_name);
413
312
}
414
313
gpgme_recipient_t recipient;
415
314
recipient = result->recipients;
416
315
while(recipient != NULL){
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
424
322
recipient = recipient->next;
425
323
}
426
324
}
429
327
}
430
328
431
329
if(debug){
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
433
331
}
434
332
435
333
/* Seek back to the beginning of the GPGME plaintext data buffer */
436
334
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
437
perror_plus("gpgme_data_seek");
335
perror("gpgme_data_seek");
438
336
plaintext_length = -1;
439
337
goto decrypt_end;
440
338
}
442
340
*plaintext = NULL;
443
341
while(true){
444
342
plaintext_capacity = incbuffer(plaintext,
445
(size_t)plaintext_length,
446
plaintext_capacity);
343
(size_t)plaintext_length,
344
plaintext_capacity);
447
345
if(plaintext_capacity == 0){
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
451
349
}
452
350
453
351
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
458
356
break;
459
357
}
460
358
if(ret < 0){
461
perror_plus("gpgme_data_read");
359
perror("gpgme_data_read");
462
360
plaintext_length = -1;
463
361
goto decrypt_end;
464
362
}
466
364
}
467
365
468
366
if(debug){
469
fprintf_plus(stderr, "Decrypted password is: ");
367
fprintf(stderr, "Decrypted password is: ");
470
368
for(ssize_t i = 0; i < plaintext_length; i++){
471
369
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
472
370
}
483
381
return plaintext_length;
484
382
}
485
383
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
489
387
if(ret == NULL)
490
388
ret = "(unknown)";
491
389
return ret;
492
390
}
493
391
494
392
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
393
static void debuggnutls(__attribute__((unused)) int level,
497
394
const char* string){
498
fprintf_plus(stderr, "GnuTLS: %s", string);
395
fprintf(stderr, "GnuTLS: %s", string);
499
396
}
500
397
501
__attribute__((nonnull, warn_unused_result))
502
398
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
399
const char *seckeyfilename){
505
400
int ret;
506
401
507
402
if(debug){
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
fprintf(stderr, "Initializing GnuTLS\n");
509
404
}
510
405
511
406
ret = gnutls_global_init();
512
407
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
515
410
return -1;
516
411
}
517
412
524
419
}
525
420
526
421
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
528
423
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
531
429
gnutls_global_deinit();
532
430
return -1;
533
431
}
534
432
535
433
if(debug){
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
540
437
}
541
438
542
439
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
440
(mc.cred, pubkeyfilename, seckeyfilename,
544
441
GNUTLS_OPENPGP_FMT_BASE64);
545
442
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
551
448
goto globalfail;
552
449
}
553
450
554
451
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
452
ret = gnutls_dh_params_init(&mc.dh_params);
556
453
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
560
456
goto globalfail;
561
457
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
459
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
566
462
goto globalfail;
567
463
}
568
464
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
466
571
467
return 0;
572
468
573
469
globalfail:
574
470
575
gnutls_certificate_free_credentials(mc->cred);
471
gnutls_certificate_free_credentials(mc.cred);
576
472
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
473
gnutls_dh_params_deinit(mc.dh_params);
578
474
return -1;
579
475
}
580
476
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
477
static int init_gnutls_session(gnutls_session_t *session){
584
478
int ret;
585
479
/* GnuTLS session creation */
586
480
do {
590
484
}
591
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
486
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
596
489
}
597
490
598
491
{
599
492
const char *err;
600
493
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
495
if(quit_now){
603
496
gnutls_deinit(*session);
604
497
return -1;
605
498
}
606
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
500
if(ret != GNUTLS_E_SUCCESS){
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
611
504
gnutls_deinit(*session);
612
505
return -1;
613
506
}
615
508
616
509
do {
617
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
511
mc.cred);
619
512
if(quit_now){
620
513
gnutls_deinit(*session);
621
514
return -1;
622
515
}
623
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
517
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
627
520
gnutls_deinit(*session);
628
521
return -1;
629
522
}
631
524
/* ignore client certificate if any. */
632
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
526
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
528
636
529
return 0;
637
530
}
641
534
__attribute__((unused)) const char *txt){}
642
535
643
536
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
537
static int start_mandos_communication(const char *ip, uint16_t port,
646
538
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
539
int af){
648
540
int ret, tcp_sd = -1;
649
541
ssize_t sret;
650
struct sockaddr_storage to;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
651
546
char *buffer = NULL;
652
547
char *decrypted_buffer = NULL;
653
548
size_t buffer_length = 0;
657
552
gnutls_session_t session;
658
553
int pf; /* Protocol family */
659
554
660
errno = 0;
661
662
555
if(quit_now){
663
errno = EINTR;
664
556
return -1;
665
557
}
666
558
672
564
pf = PF_INET;
673
565
break;
674
566
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
676
errno = EINVAL;
567
fprintf(stderr, "Bad address family: %d\n", af);
677
568
return -1;
678
569
}
679
570
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
571
ret = init_gnutls_session(&session);
713
572
if(ret != 0){
714
573
return -1;
715
574
}
716
575
717
576
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
720
579
}
721
580
722
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
723
582
if(tcp_sd < 0){
724
int e = errno;
725
perror_plus("socket");
726
errno = e;
583
perror("socket");
727
584
goto mandos_end;
728
585
}
729
586
730
587
if(quit_now){
731
errno = EINTR;
732
588
goto mandos_end;
733
589
}
734
590
735
591
memset(&to, 0, sizeof(to));
736
592
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
739
595
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
742
598
}
743
599
if(ret < 0 ){
744
int e = errno;
745
perror_plus("inet_pton");
746
errno = e;
600
perror("inet_pton");
747
601
goto mandos_end;
748
602
}
749
603
if(ret == 0){
750
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
752
errno = e;
604
fprintf(stderr, "Bad address: %s\n", ip);
753
605
goto mandos_end;
754
606
}
755
607
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
759
615
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
762
errno = EINVAL;
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
763
618
goto mandos_end;
764
619
}
765
620
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
621
to.in6.sin6_scope_id = (uint32_t)if_index;
767
622
}
768
623
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
770
627
}
771
628
772
629
if(quit_now){
773
errno = EINTR;
774
630
goto mandos_end;
775
631
}
776
632
778
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
779
635
char interface[IF_NAMESIZE];
780
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
perror_plus("if_indextoname");
637
perror("if_indextoname");
782
638
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
785
641
}
786
642
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
789
645
}
790
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
792
649
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
797
652
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
802
655
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
656
if(pcret == NULL){
657
perror("inet_ntop");
658
} else {
659
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
661
}
809
662
}
810
663
}
811
664
812
665
if(quit_now){
813
errno = EINTR;
814
666
goto mandos_end;
815
667
}
816
668
817
669
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
671
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
673
}
824
674
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
675
perror("connect");
830
676
goto mandos_end;
831
677
}
832
678
833
679
if(quit_now){
834
errno = EINTR;
835
680
goto mandos_end;
836
681
}
837
682
840
685
while(true){
841
686
size_t out_size = strlen(out);
842
687
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
843
out_size - written));
688
out_size - written));
844
689
if(ret == -1){
845
int e = errno;
846
perror_plus("write");
847
errno = e;
690
perror("write");
848
691
goto mandos_end;
849
692
}
850
693
written += (size_t)ret;
860
703
}
861
704
862
705
if(quit_now){
863
errno = EINTR;
864
706
goto mandos_end;
865
707
}
866
708
}
867
709
868
710
if(debug){
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
870
712
}
871
713
872
714
if(quit_now){
873
errno = EINTR;
874
715
goto mandos_end;
875
716
}
876
717
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
882
719
883
720
if(quit_now){
884
errno = EINTR;
885
721
goto mandos_end;
886
722
}
887
723
888
724
do {
889
725
ret = gnutls_handshake(session);
890
726
if(quit_now){
891
errno = EINTR;
892
727
goto mandos_end;
893
728
}
894
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
895
730
896
731
if(ret != GNUTLS_E_SUCCESS){
897
732
if(debug){
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
899
734
gnutls_perror(ret);
900
735
}
901
errno = EPROTO;
902
736
goto mandos_end;
903
737
}
904
738
905
739
/* Read OpenPGP packet that contains the wanted password */
906
740
907
741
if(debug){
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
910
744
}
911
745
912
746
while(true){
913
747
914
748
if(quit_now){
915
errno = EINTR;
916
749
goto mandos_end;
917
750
}
918
751
919
752
buffer_capacity = incbuffer(&buffer, buffer_length,
920
buffer_capacity);
753
buffer_capacity);
921
754
if(buffer_capacity == 0){
922
int e = errno;
923
perror_plus("incbuffer");
924
errno = e;
755
perror("incbuffer");
925
756
goto mandos_end;
926
757
}
927
758
928
759
if(quit_now){
929
errno = EINTR;
930
760
goto mandos_end;
931
761
}
932
762
945
775
ret = gnutls_handshake(session);
946
776
947
777
if(quit_now){
948
errno = EINTR;
949
778
goto mandos_end;
950
779
}
951
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
952
781
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
955
783
gnutls_perror(ret);
956
errno = EPROTO;
957
784
goto mandos_end;
958
785
}
959
786
break;
960
787
default:
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
963
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
errno = EIO;
965
791
goto mandos_end;
966
792
}
967
793
} else {
970
796
}
971
797
972
798
if(debug){
973
fprintf_plus(stderr, "Closing TLS session\n");
799
fprintf(stderr, "Closing TLS session\n");
974
800
}
975
801
976
802
if(quit_now){
977
errno = EINTR;
978
803
goto mandos_end;
979
804
}
980
805
981
806
do {
982
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
983
808
if(quit_now){
984
errno = EINTR;
985
809
goto mandos_end;
986
810
}
987
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
988
812
989
813
if(buffer_length > 0){
990
814
ssize_t decrypted_buffer_size;
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
817
&decrypted_buffer);
993
818
if(decrypted_buffer_size >= 0){
994
819
995
820
written = 0;
996
821
while(written < (size_t) decrypted_buffer_size){
997
822
if(quit_now){
998
errno = EINTR;
999
823
goto mandos_end;
1000
824
}
1001
825
1003
827
(size_t)decrypted_buffer_size - written,
1004
828
stdout);
1005
829
if(ret == 0 and ferror(stdout)){
1006
int e = errno;
1007
830
if(debug){
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
1010
833
}
1011
errno = e;
1012
834
goto mandos_end;
1013
835
}
1014
836
written += (size_t)ret;
1020
842
/* Shutdown procedure */
1021
843
1022
844
mandos_end:
1023
{
1024
int e = errno;
1025
free(decrypted_buffer);
1026
free(buffer);
1027
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1029
}
1030
if(ret == -1){
1031
if(e == 0){
1032
e = errno;
1033
}
1034
perror_plus("close");
1035
}
1036
gnutls_deinit(session);
1037
errno = e;
1038
if(quit_now){
1039
errno = EINTR;
1040
retval = -1;
1041
}
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
1042
856
}
1043
857
return retval;
1044
858
}
1045
859
1046
__attribute__((nonnull))
1047
860
static void resolve_callback(AvahiSServiceResolver *r,
1048
861
AvahiIfIndex interface,
1049
862
AvahiProtocol proto,
1057
870
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
871
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
872
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
873
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1064
875
1065
876
/* Called whenever a service has been resolved successfully or
1066
877
timed out */
1072
883
switch(event){
1073
884
default:
1074
885
case AVAHI_RESOLVER_FAILURE:
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1080
889
break;
1081
890
1082
891
case AVAHI_RESOLVER_FOUND:
1084
893
char ip[AVAHI_ADDRESS_STR_MAX];
1085
894
avahi_address_snprint(ip, sizeof(ip), address);
1086
895
if(debug){
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1090
899
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
1095
902
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1097
} else {
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
903
avahi_simple_poll_quit(mc.simple_poll);
1104
904
}
1105
905
}
1106
906
}
1116
916
const char *domain,
1117
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
918
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1123
921
1124
922
/* Called whenever a new services becomes available on the LAN or
1125
923
is removed from the LAN */
1132
930
default:
1133
931
case AVAHI_BROWSER_FAILURE:
1134
932
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
1139
936
return;
1140
937
1141
938
case AVAHI_BROWSER_NEW:
1144
941
the callback function is called the Avahi server will free the
1145
942
resolver for us. */
1146
943
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1155
949
break;
1156
950
1157
951
case AVAHI_BROWSER_REMOVE:
1160
954
case AVAHI_BROWSER_ALL_FOR_NOW:
1161
955
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1162
956
if(debug){
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1165
958
}
1166
959
break;
1167
960
}
1168
961
}
1169
962
1170
/* Signal handler that stops main loop after SIGTERM */
963
/* stop main loop after sigterm has been called */
1171
964
static void handle_sigterm(int sig){
1172
965
if(quit_now){
1173
966
return;
1175
968
quit_now = 1;
1176
969
signal_received = sig;
1177
970
int old_errno = errno;
1178
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1181
}
1182
errno = old_errno;
1183
}
1184
1185
__attribute__((nonnull, warn_unused_result))
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
int ret;
1188
error_t ret_errno;
1189
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
if(s < 0){
1192
ret_errno = errno;
1193
perror_plus("socket");
1194
errno = ret_errno;
1195
return false;
1196
}
1197
strcpy(ifr->ifr_name, ifname);
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
if(ret == -1){
1200
if(debug){
1201
ret_errno = errno;
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
}
1205
return false;
1206
}
1207
return true;
1208
}
1209
1210
__attribute__((nonnull, warn_unused_result))
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1213
/* Reject the loopback device */
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1218
}
1219
return false;
1220
}
1221
/* Accept point-to-point devices only if connect_to is specified */
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1226
}
1227
return true;
1228
}
1229
/* Otherwise, reject non-broadcast-capable devices */
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1234
}
1235
return false;
1236
}
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
if(ifr->ifr_flags & IFF_NOARP){
1239
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1242
}
1243
return false;
1244
}
1245
1246
/* Accept this device */
1247
if(debug){
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1249
}
1250
return true;
1251
}
1252
1253
/*
1254
* This function determines if a directory entry in /sys/class/net
1255
* corresponds to an acceptable network device.
1256
* (This function is passed to scandir(3) as a filter function.)
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
int good_interface(const struct dirent *if_entry){
1260
if(if_entry->d_name[0] == '.'){
1261
return 0;
1262
}
1263
1264
struct ifreq ifr;
1265
if(not get_flags(if_entry->d_name, &ifr)){
1266
if(debug){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
int notdotentries(const struct dirent *direntry){
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
int runnable_hook(const struct dirent *direntry){
1328
int ret;
1329
size_t sret;
1330
struct stat st;
1331
1332
if((direntry->d_name)[0] == '\0'){
1333
/* Empty name? */
1334
return 0;
1335
}
1336
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
"abcdefghijklmnopqrstuvwxyz"
1339
"0123456789"
1340
"_.-");
1341
if((direntry->d_name)[sret] != '\0'){
1342
/* Contains non-allowed characters */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1351
if(ret == -1){
1352
if(debug){
1353
perror_plus("Could not stat hook");
1354
}
1355
return 0;
1356
}
1357
if(not (S_ISREG(st.st_mode))){
1358
/* Not a regular file */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
/* Not executable */
1367
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1370
}
1371
return 0;
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1377
return 1;
1378
}
1379
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1383
int ret;
1384
struct timespec now;
1385
struct timespec waited_time;
1386
intmax_t block_time;
1387
1388
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1393
}
1394
ret = avahi_simple_poll_iterate(s, -1);
1395
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1399
}
1400
/* the current time */
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
/* Calculating in ms how long time between now and server
1407
who we visted longest time ago. Now - last seen. */
1408
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1410
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1412
/* total time is 10s/10,000ms.
1413
Converting to s from ms by dividing by 1,000,
1414
and ns to ms by dividing by 1,000,000. */
1415
block_time = ((retry_interval
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1422
}
1423
1424
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1429
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1431
return 0;
1432
}
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1435
if(ret == -1){
1436
perror_plus("clock_gettime");
1437
return -1;
1438
}
1439
mc->current_server = mc->current_server->next;
1440
block_time = 0; /* Call avahi to find new Mandos
1441
servers, but don't block */
1442
}
1443
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
}
1446
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1448
return (ret != 1) ? ret : 0;
1449
}
1450
}
1451
}
1452
}
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1512
const float delay){
1513
struct dirent **direntries = NULL;
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1518
if(debug){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1521
}
1522
} else {
1523
perror_plus("open");
1524
}
1525
return;
1526
}
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1540
if(numhooks == -1){
1541
perror_plus("scandir");
1542
return;
1543
}
1544
struct dirent *direntry;
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1549
if(debug){
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1551
direntry->d_name);
1552
}
1553
pid_t hook_pid = fork();
1554
if(hook_pid == 0){
1555
/* Child */
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
perror_plus("Failed to raise privileges");
1737
}
1738
1739
#ifdef __linux__
1740
int ret_linux;
1741
bool restore_loglevel = false;
1742
if(ret_errno == 0){
1743
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1744
messages about the network interface to mess up the prompt */
1745
ret_linux = klogctl(8, NULL, 5);
1746
if(ret_linux == -1){
1747
perror_plus("klogctl");
1748
} else {
1749
restore_loglevel = true;
1750
}
1751
}
1752
#endif /* __linux__ */
1753
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1754
ioctl_errno = errno;
1755
#ifdef __linux__
1756
if(restore_loglevel){
1757
ret_linux = klogctl(7, NULL, 0);
1758
if(ret_linux == -1){
1759
perror_plus("klogctl");
1760
}
1761
}
1762
#endif /* __linux__ */
1763
1764
/* If raise_privileges() succeeded above */
1765
if(ret_errno == 0){
1766
/* Lower privileges */
1767
ret_errno = lower_privileges();
1768
if(ret_errno != 0){
1769
errno = ret_errno;
1770
perror_plus("Failed to lower privileges");
1771
}
1772
}
1773
1774
/* Close the socket */
1775
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1776
if(ret == -1){
1777
perror_plus("close");
1778
}
1779
1780
if(ret_setflags == -1){
1781
errno = ioctl_errno;
1782
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1783
errno = old_errno;
1784
return ioctl_errno;
1785
}
1786
} else if(debug){
1787
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1788
interface);
1789
}
1790
1791
/* Sleep checking until interface is running.
1792
Check every 0.25s, up to total time of delay */
1793
for(int i=0; i < delay * 4; i++){
1794
if(interface_is_running(interface)){
1795
break;
1796
}
1797
struct timespec sleeptime = { .tv_nsec = 250000000 };
1798
ret = nanosleep(&sleeptime, NULL);
1799
if(ret == -1 and errno != EINTR){
1800
perror_plus("nanosleep");
1801
}
1802
}
1803
1804
errno = old_errno;
1805
return 0;
1806
}
1807
1808
__attribute__((nonnull, warn_unused_result))
1809
error_t take_down_interface(const char *const interface){
1810
error_t old_errno = errno;
1811
struct ifreq network;
1812
unsigned int if_index = if_nametoindex(interface);
1813
if(if_index == 0){
1814
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1815
errno = old_errno;
1816
return ENXIO;
1817
}
1818
if(interface_is_up(interface)){
1819
error_t ret_errno = 0, ioctl_errno = 0;
1820
if(not get_flags(interface, &network) and debug){
1821
ret_errno = errno;
1822
fprintf_plus(stderr, "Failed to get flags for interface "
1823
"\"%s\"\n", interface);
1824
errno = old_errno;
1825
return ret_errno;
1826
}
1827
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1828
1829
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1830
if(sd == -1){
1831
ret_errno = errno;
1832
perror_plus("socket");
1833
errno = old_errno;
1834
return ret_errno;
1835
}
1836
1837
if(debug){
1838
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1839
interface);
1840
}
1841
1842
/* Raise privileges */
1843
ret_errno = raise_privileges();
1844
if(ret_errno != 0){
1845
perror_plus("Failed to raise privileges");
1846
}
1847
1848
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1849
ioctl_errno = errno;
1850
1851
/* If raise_privileges() succeeded above */
1852
if(ret_errno == 0){
1853
/* Lower privileges */
1854
ret_errno = lower_privileges();
1855
if(ret_errno != 0){
1856
errno = ret_errno;
1857
perror_plus("Failed to lower privileges");
1858
}
1859
}
1860
1861
/* Close the socket */
1862
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1863
if(ret == -1){
1864
perror_plus("close");
1865
}
1866
1867
if(ret_setflags == -1){
1868
errno = ioctl_errno;
1869
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1870
errno = old_errno;
1871
return ioctl_errno;
1872
}
1873
} else if(debug){
1874
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1875
interface);
1876
}
1877
1878
errno = old_errno;
1879
return 0;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
1880
975
}
1881
976
1882
977
int main(int argc, char *argv[]){
1883
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1884
.priority = "SECURE256:!CTYPE-X.509:"
1885
"+CTYPE-OPENPGP", .current_server = NULL,
1886
.interfaces = NULL, .interfaces_size = 0 };
1887
978
AvahiSServiceBrowser *sb = NULL;
1888
error_t ret_errno;
979
int error;
1889
980
int ret;
1890
981
intmax_t tmpmax;
1891
982
char *tmp;
1892
983
int exitcode = EXIT_SUCCESS;
1893
char *interfaces_to_take_down = NULL;
1894
size_t interfaces_to_take_down_size = 0;
1895
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1896
char old_tempdir[] = "/tmp/mandosXXXXXX";
1897
char *tempdir = NULL;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
1898
993
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1899
994
const char *seckey = PATHDIR "/" SECKEY;
1900
995
const char *pubkey = PATHDIR "/" PUBKEY;
1901
char *interfaces_hooks = NULL;
1902
996
1903
997
bool gnutls_initialized = false;
1904
998
bool gpgme_initialized = false;
1905
999
float delay = 2.5f;
1906
double retry_interval = 10; /* 10s between trying a server and
1907
retrying the same server again */
1908
1000
1909
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1910
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1916
1008
errno = 0;
1917
1009
ret = setgid(gid);
1918
1010
if(ret == -1){
1919
perror_plus("setgid");
1011
perror("setgid");
1920
1012
}
1921
1013
1922
1014
/* Lower user privileges (temporarily) */
1923
1015
errno = 0;
1924
1016
ret = seteuid(uid);
1925
1017
if(ret == -1){
1926
perror_plus("seteuid");
1018
perror("seteuid");
1927
1019
}
1928
1020
1929
1021
if(quit_now){
1964
1056
.arg = "SECONDS",
1965
1057
.doc = "Maximum delay to wait for interface startup",
1966
1058
.group = 2 },
1967
{ .name = "retry", .key = 132,
1968
.arg = "SECONDS",
1969
.doc = "Retry interval used when denied by the Mandos server",
1970
.group = 2 },
1971
{ .name = "network-hook-dir", .key = 133,
1972
.arg = "DIR",
1973
.doc = "Directory where network hooks are located",
1974
.group = 2 },
1975
/*
1976
* These reproduce what we would get without ARGP_NO_HELP
1977
*/
1978
{ .name = "help", .key = '?',
1979
.doc = "Give this help list", .group = -1 },
1980
{ .name = "usage", .key = -3,
1981
.doc = "Give a short usage message", .group = -1 },
1982
{ .name = "version", .key = 'V',
1983
.doc = "Print program version", .group = -1 },
1984
1059
{ .name = NULL }
1985
1060
};
1986
1061
1987
1062
error_t parse_opt(int key, char *arg,
1988
1063
struct argp_state *state){
1989
errno = 0;
1990
1064
switch(key){
1991
1065
case 128: /* --debug */
1992
1066
debug = true;
1995
1069
connect_to = arg;
1996
1070
break;
1997
1071
case 'i': /* --interface */
1998
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1999
arg, (int)',');
2000
if(ret_errno != 0){
2001
argp_error(state, "%s", strerror(ret_errno));
2002
}
1072
interface = arg;
2003
1073
break;
2004
1074
case 's': /* --seckey */
2005
1075
seckey = arg;
2012
1082
tmpmax = strtoimax(arg, &tmp, 10);
2013
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
2014
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2015
argp_error(state, "Bad number of DH bits");
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
2016
1087
}
2017
1088
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2018
1089
break;
2023
1094
errno = 0;
2024
1095
delay = strtof(arg, &tmp);
2025
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
2026
argp_error(state, "Bad delay");
2027
}
2028
case 132: /* --retry */
2029
errno = 0;
2030
retry_interval = strtod(arg, &tmp);
2031
if(errno != 0 or tmp == arg or *tmp != '\0'
2032
or (retry_interval * 1000) > INT_MAX
2033
or retry_interval < 0){
2034
argp_error(state, "Bad retry interval");
2035
}
2036
break;
2037
case 133: /* --network-hook-dir */
2038
hookdir = arg;
2039
break;
2040
/*
2041
* These reproduce what we would get without ARGP_NO_HELP
2042
*/
2043
case '?': /* --help */
2044
argp_state_help(state, state->out_stream,
2045
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2046
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2047
case -3: /* --usage */
2048
argp_state_help(state, state->out_stream,
2049
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2050
case 'V': /* --version */
2051
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2052
exit(argp_err_exit_status);
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
2053
1104
break;
2054
1105
default:
2055
1106
return ARGP_ERR_UNKNOWN;
2056
1107
}
2057
return errno;
1108
return 0;
2058
1109
}
2059
1110
2060
1111
struct argp argp = { .options = options, .parser = parse_opt,
2061
1112
.args_doc = "",
2062
1113
.doc = "Mandos client -- Get and decrypt"
2063
1114
" passwords from a Mandos server" };
2064
ret = argp_parse(&argp, argc, argv,
2065
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2066
switch(ret){
2067
case 0:
2068
break;
2069
case ENOMEM:
2070
default:
2071
errno = ret;
2072
perror_plus("argp_parse");
2073
exitcode = EX_OSERR;
2074
goto end;
2075
case EINVAL:
2076
exitcode = EX_USAGE;
2077
goto end;
2078
}
2079
}
2080
2081
{
2082
/* Work around Debian bug #633582:
2083
<http://bugs.debian.org/633582> */
2084
2085
/* Re-raise privileges */
2086
ret_errno = raise_privileges();
2087
if(ret_errno != 0){
2088
errno = ret_errno;
2089
perror_plus("Failed to raise privileges");
2090
} else {
2091
struct stat st;
2092
2093
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2094
int seckey_fd = open(seckey, O_RDONLY);
2095
if(seckey_fd == -1){
2096
perror_plus("open");
2097
} else {
2098
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2099
if(ret == -1){
2100
perror_plus("fstat");
2101
} else {
2102
if(S_ISREG(st.st_mode)
2103
and st.st_uid == 0 and st.st_gid == 0){
2104
ret = fchown(seckey_fd, uid, gid);
2105
if(ret == -1){
2106
perror_plus("fchown");
2107
}
2108
}
2109
}
2110
TEMP_FAILURE_RETRY(close(seckey_fd));
2111
}
2112
}
2113
2114
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2115
int pubkey_fd = open(pubkey, O_RDONLY);
2116
if(pubkey_fd == -1){
2117
perror_plus("open");
2118
} else {
2119
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2120
if(ret == -1){
2121
perror_plus("fstat");
2122
} else {
2123
if(S_ISREG(st.st_mode)
2124
and st.st_uid == 0 and st.st_gid == 0){
2125
ret = fchown(pubkey_fd, uid, gid);
2126
if(ret == -1){
2127
perror_plus("fchown");
2128
}
2129
}
2130
}
2131
TEMP_FAILURE_RETRY(close(pubkey_fd));
2132
}
2133
}
2134
2135
/* Lower privileges */
2136
ret_errno = lower_privileges();
2137
if(ret_errno != 0){
2138
errno = ret_errno;
2139
perror_plus("Failed to lower privileges");
2140
}
2141
}
2142
}
2143
2144
/* Remove invalid interface names (except "none") */
2145
{
2146
char *interface = NULL;
2147
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2148
interface))){
2149
if(strcmp(interface, "none") != 0
2150
and if_nametoindex(interface) == 0){
2151
if(interface[0] != '\0'){
2152
fprintf_plus(stderr, "Not using nonexisting interface"
2153
" \"%s\"\n", interface);
2154
}
2155
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2156
interface = NULL;
2157
}
2158
}
2159
}
2160
2161
/* Run network hooks */
2162
{
2163
if(mc.interfaces != NULL){
2164
interfaces_hooks = malloc(mc.interfaces_size);
2165
if(interfaces_hooks == NULL){
2166
perror_plus("malloc");
2167
goto end;
2168
}
2169
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2170
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2171
}
2172
run_network_hooks("start", interfaces_hooks != NULL ?
2173
interfaces_hooks : "", delay);
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
2174
1121
}
2175
1122
2176
1123
if(not debug){
2181
1128
from the signal handler */
2182
1129
/* Initialize the pseudo-RNG for Avahi */
2183
1130
srand((unsigned int) time(NULL));
2184
simple_poll = avahi_simple_poll_new();
2185
if(simple_poll == NULL){
2186
fprintf_plus(stderr,
2187
"Avahi: Failed to create simple poll object.\n");
2188
exitcode = EX_UNAVAILABLE;
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2189
1135
goto end;
2190
1136
}
2191
1137
2192
1138
sigemptyset(&sigterm_action.sa_mask);
2193
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2194
1140
if(ret == -1){
2195
perror_plus("sigaddset");
2196
exitcode = EX_OSERR;
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2197
1143
goto end;
2198
1144
}
2199
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2200
1146
if(ret == -1){
2201
perror_plus("sigaddset");
2202
exitcode = EX_OSERR;
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2203
1149
goto end;
2204
1150
}
2205
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2206
1152
if(ret == -1){
2207
perror_plus("sigaddset");
2208
exitcode = EX_OSERR;
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2209
1155
goto end;
2210
1156
}
2211
1157
/* Need to check if the handler is SIG_IGN before handling:
2214
1160
*/
2215
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2216
1162
if(ret == -1){
2217
perror_plus("sigaction");
2218
return EX_OSERR;
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2219
1165
}
2220
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
2221
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
2222
1168
if(ret == -1){
2223
perror_plus("sigaction");
2224
exitcode = EX_OSERR;
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2225
1171
goto end;
2226
1172
}
2227
1173
}
2228
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2229
1175
if(ret == -1){
2230
perror_plus("sigaction");
2231
return EX_OSERR;
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2232
1178
}
2233
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
2234
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2235
1181
if(ret == -1){
2236
perror_plus("sigaction");
2237
exitcode = EX_OSERR;
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2238
1184
goto end;
2239
1185
}
2240
1186
}
2241
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2242
1188
if(ret == -1){
2243
perror_plus("sigaction");
2244
return EX_OSERR;
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2245
1191
}
2246
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
2247
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2248
1194
if(ret == -1){
2249
perror_plus("sigaction");
2250
exitcode = EX_OSERR;
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
2251
1197
goto end;
2252
1198
}
2253
1199
}
2254
1200
2255
/* If no interfaces were specified, make a list */
2256
if(mc.interfaces == NULL){
2257
struct dirent **direntries = NULL;
2258
/* Look for any good interfaces */
2259
ret = scandir(sys_class_net, &direntries, good_interface,
2260
alphasort);
2261
if(ret >= 1){
2262
/* Add all found interfaces to interfaces list */
2263
for(int i = 0; i < ret; ++i){
2264
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2265
direntries[i]->d_name);
2266
if(ret_errno != 0){
2267
errno = ret_errno;
2268
perror_plus("argz_add");
2269
continue;
2270
}
2271
if(debug){
2272
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2273
direntries[i]->d_name);
2274
}
2275
}
2276
free(direntries);
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
1286
}
1287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
break;
1305
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
2277
1336
} else {
2278
if(ret == 0){
2279
free(direntries);
2280
}
2281
fprintf_plus(stderr, "Could not find a network interface\n");
2282
exitcode = EXIT_FAILURE;
2283
goto end;
2284
}
2285
}
2286
2287
/* Bring up interfaces which are down, and remove any "none"s */
2288
{
2289
char *interface = NULL;
2290
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2291
interface))){
2292
/* If interface name is "none", stop bringing up interfaces.
2293
Also remove all instances of "none" from the list */
2294
if(strcmp(interface, "none") == 0){
2295
argz_delete(&mc.interfaces, &mc.interfaces_size,
2296
interface);
2297
interface = NULL;
2298
while((interface = argz_next(mc.interfaces,
2299
mc.interfaces_size, interface))){
2300
if(strcmp(interface, "none") == 0){
2301
argz_delete(&mc.interfaces, &mc.interfaces_size,
2302
interface);
2303
interface = NULL;
2304
}
2305
}
2306
break;
2307
}
2308
bool interface_was_up = interface_is_up(interface);
2309
errno = bring_up_interface(interface, delay);
2310
if(not interface_was_up){
2311
if(errno != 0){
2312
perror_plus("Failed to bring up interface");
2313
} else {
2314
errno = argz_add(&interfaces_to_take_down,
2315
&interfaces_to_take_down_size,
2316
interface);
2317
if(errno != 0){
2318
perror_plus("argz_add");
2319
}
2320
}
2321
}
2322
}
2323
if(debug and (interfaces_to_take_down == NULL)){
2324
fprintf_plus(stderr, "No interfaces were brought up\n");
2325
}
2326
}
2327
2328
/* If we only got one interface, explicitly use only that one */
2329
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2330
if(debug){
2331
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2332
mc.interfaces);
2333
}
2334
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
2335
1343
}
2336
1344
2337
1345
if(quit_now){
2338
1346
goto end;
2339
1347
}
2340
1348
2341
ret = init_gnutls_global(pubkey, seckey, &mc);
1349
ret = init_gnutls_global(pubkey, seckey);
2342
1350
if(ret == -1){
2343
fprintf_plus(stderr, "init_gnutls_global failed\n");
2344
exitcode = EX_UNAVAILABLE;
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2345
1353
goto end;
2346
1354
} else {
2347
1355
gnutls_initialized = true;
2351
1359
goto end;
2352
1360
}
2353
1361
2354
/* Try /run/tmp before /tmp */
2355
tempdir = mkdtemp(run_tempdir);
2356
if(tempdir == NULL and errno == ENOENT){
2357
if(debug){
2358
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2359
run_tempdir, old_tempdir);
2360
}
2361
tempdir = mkdtemp(old_tempdir);
2362
}
2363
if(tempdir == NULL){
2364
perror_plus("mkdtemp");
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
2365
1366
goto end;
2366
1367
}
2367
1368
2369
1370
goto end;
2370
1371
}
2371
1372
2372
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2373
fprintf_plus(stderr, "init_gpgme failed\n");
2374
exitcode = EX_UNAVAILABLE;
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2375
1376
goto end;
2376
1377
} else {
2377
1378
gpgme_initialized = true;
2385
1386
/* Connect directly, do not use Zeroconf */
2386
1387
/* (Mainly meant for debugging) */
2387
1388
char *address = strrchr(connect_to, ':');
2388
2389
1389
if(address == NULL){
2390
fprintf_plus(stderr, "No colon in address\n");
2391
exitcode = EX_USAGE;
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2392
1392
goto end;
2393
1393
}
2394
1394
2396
1396
goto end;
2397
1397
}
2398
1398
2399
in_port_t port;
1399
uint16_t port;
2400
1400
errno = 0;
2401
1401
tmpmax = strtoimax(address+1, &tmp, 10);
2402
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2403
or tmpmax != (in_port_t)tmpmax){
2404
fprintf_plus(stderr, "Bad port number\n");
2405
exitcode = EX_USAGE;
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2406
1406
goto end;
2407
1407
}
2408
1408
2409
1409
if(quit_now){
2410
1410
goto end;
2411
1411
}
2412
1412
2413
port = (in_port_t)tmpmax;
1413
port = (uint16_t)tmpmax;
2414
1414
*address = '\0';
1415
address = connect_to;
2415
1416
/* Colon in address indicates IPv6 */
2416
1417
int af;
2417
if(strchr(connect_to, ':') != NULL){
1418
if(strchr(address, ':') != NULL){
2418
1419
af = AF_INET6;
2419
/* Accept [] around IPv6 address - see RFC 5952 */
2420
if(connect_to[0] == '[' and address[-1] == ']')
2421
{
2422
connect_to++;
2423
address[-1] = '\0';
2424
}
2425
1420
} else {
2426
1421
af = AF_INET;
2427
1422
}
2428
address = connect_to;
2429
1423
2430
1424
if(quit_now){
2431
1425
goto end;
2432
1426
}
2433
1427
2434
while(not quit_now){
2435
ret = start_mandos_communication(address, port, if_index, af,
2436
&mc);
2437
if(quit_now or ret == 0){
2438
break;
2439
}
2440
if(debug){
2441
fprintf_plus(stderr, "Retrying in %d seconds\n",
2442
(int)retry_interval);
2443
}
2444
sleep((unsigned int)retry_interval);
2445
}
2446
2447
if(not quit_now){
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2448
1432
exitcode = EXIT_SUCCESS;
2449
1433
}
2450
2451
1434
goto end;
2452
1435
}
2453
1436
2465
1448
config.publish_domain = 0;
2466
1449
2467
1450
/* Allocate a new server */
2468
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2469
&config, NULL, NULL, &ret_errno);
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2470
1454
2471
1455
/* Free the Avahi configuration data */
2472
1456
avahi_server_config_free(&config);
2474
1458
2475
1459
/* Check if creating the Avahi server object succeeded */
2476
1460
if(mc.server == NULL){
2477
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2478
avahi_strerror(ret_errno));
2479
exitcode = EX_UNAVAILABLE;
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2480
1464
goto end;
2481
1465
}
2482
1466
2487
1471
/* Create the Avahi service browser */
2488
1472
sb = avahi_s_service_browser_new(mc.server, if_index,
2489
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2490
NULL, 0, browse_callback,
2491
(void *)&mc);
1474
NULL, 0, browse_callback, NULL);
2492
1475
if(sb == NULL){
2493
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2494
avahi_strerror(avahi_server_errno(mc.server)));
2495
exitcode = EX_UNAVAILABLE;
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2496
1479
goto end;
2497
1480
}
2498
1481
2503
1486
/* Run the main loop */
2504
1487
2505
1488
if(debug){
2506
fprintf_plus(stderr, "Starting Avahi loop search\n");
1489
fprintf(stderr, "Starting Avahi loop search\n");
2507
1490
}
2508
1491
2509
ret = avahi_loop_with_timeout(simple_poll,
2510
(int)(retry_interval * 1000), &mc);
2511
if(debug){
2512
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2513
(ret == 0) ? "successfully" : "with error");
2514
}
1492
avahi_simple_poll_loop(mc.simple_poll);
2515
1493
2516
1494
end:
2517
1495
2518
1496
if(debug){
2519
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2520
1498
}
2521
1499
2522
1500
/* Cleanup things */
2523
free(mc.interfaces);
2524
2525
1501
if(sb != NULL)
2526
1502
avahi_s_service_browser_free(sb);
2527
1503
2528
1504
if(mc.server != NULL)
2529
1505
avahi_server_free(mc.server);
2530
1506
2531
if(simple_poll != NULL)
2532
avahi_simple_poll_free(simple_poll);
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
2533
1509
2534
1510
if(gnutls_initialized){
2535
1511
gnutls_certificate_free_credentials(mc.cred);
2541
1517
gpgme_release(mc.ctx);
2542
1518
}
2543
1519
2544
/* Cleans up the circular linked list of Mandos servers the client
2545
has seen */
2546
if(mc.current_server != NULL){
2547
mc.current_server->prev->next = NULL;
2548
while(mc.current_server != NULL){
2549
server *next = mc.current_server->next;
2550
free(mc.current_server);
2551
mc.current_server = next;
2552
}
2553
}
2554
2555
/* Re-raise privileges */
2556
{
2557
ret_errno = raise_privileges();
2558
if(ret_errno != 0){
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2583
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
perror_plus("Failed to lower privileges permanently");
2588
}
2589
}
2590
2591
free(interfaces_to_take_down);
2592
free(interfaces_hooks);
2593
2594
/* Removes the GPGME temp directory and all files inside */
2595
if(tempdir != NULL){
2596
struct dirent **direntries = NULL;
2597
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2598
O_NOFOLLOW));
2599
if(tempdir_fd == -1){
2600
perror_plus("open");
2601
} else {
2602
#ifdef __GLIBC__
2603
#if __GLIBC_PREREQ(2, 15)
2604
int numentries = scandirat(tempdir_fd, ".", &direntries,
2605
notdotentries, alphasort);
2606
#else /* not __GLIBC_PREREQ(2, 15) */
2607
int numentries = scandir(tempdir, &direntries, notdotentries,
2608
alphasort);
2609
#endif /* not __GLIBC_PREREQ(2, 15) */
2610
#else /* not __GLIBC__ */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC__ */
2614
if(numentries >= 0){
2615
for(int i = 0; i < numentries; i++){
2616
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2617
if(ret == -1){
2618
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2619
" \"%s\", 0): %s\n", tempdir,
2620
direntries[i]->d_name, strerror(errno));
2621
}
2622
}
2623
2624
/* need to clean even if 0 because man page doesn't specify */
2625
free(direntries);
2626
if(numentries == -1){
2627
perror_plus("scandir");
2628
}
2629
ret = rmdir(tempdir);
2630
if(ret == -1 and errno != ENOENT){
2631
perror_plus("rmdir");
2632
}
2633
}
2634
TEMP_FAILURE_RETRY(close(tempdir_fd));
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
1574
char *fullname = NULL;
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
direntry->d_name);
1577
if(ret < 0){
1578
perror("asprintf");
1579
continue;
1580
}
1581
ret = remove(fullname);
1582
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
1585
}
1586
free(fullname);
1587
}
1588
closedir(d);
1589
}
1590
ret = rmdir(tempdir);
1591
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
2635
1593
}
2636
1594
}
2637
1595
2642
1600
&old_sigterm_action,
2643
1601
NULL));
2644
1602
if(ret == -1){
2645
perror_plus("sigaction");
1603
perror("sigaction");
2646
1604
}
2647
1605
do {
2648
1606
ret = raise(signal_received);
2649
1607
} while(ret != 0 and errno == EINTR);
2650
1608
if(ret != 0){
2651
perror_plus("raise");
1609
perror("raise");
2652
1610
abort();
2653
1611
}
2654
1612
TEMP_FAILURE_RETRY(pause());
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Version: 2.0.2.dev0