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- Committer: teddy at bsnet
- Date: 2010-09-09 18:16:14 UTC
- mfrom: (237.2.35 mandos-empty-device)
- Revision ID: teddy@fukt.bsnet.se-20100909181614-oanlmvkzsiodbo3c
Merge in branch to interpret an empty device name to mean
"autodetect".
"autodetect".
- 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
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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,
86
84
raise() */
87
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
86
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
87
99
88
#ifdef __linux__
100
89
#include <sys/klog.h> /* klogctl() */
118
107
init_gnutls_session(),
119
108
GNUTLS_* */
120
109
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
123
112
124
113
/* GPGME */
125
114
#include <gpgme.h> /* All GPGME types, constants and
133
122
#define PATHDIR "/conf/conf.d/mandos"
134
123
#define SECKEY "seckey.txt"
135
124
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
125
138
126
bool debug = false;
139
127
static const char mandos_protocol_version[] = "1";
140
128
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
142
130
static const char sys_class_net[] = "/sys/class/net";
143
131
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;
159
132
160
133
/* Used for passing in values through the Avahi callback functions */
161
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
162
136
AvahiServer *server;
163
137
gnutls_certificate_credentials_t cred;
164
138
unsigned int dh_bits;
165
139
gnutls_dh_params_t dh_params;
166
140
const char *priority;
167
141
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
142
} mandos_context;
172
143
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
175
148
176
149
sig_atomic_t quit_now = 0;
177
150
int signal_received = 0;
178
151
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
152
/*
199
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
154
* bytes. "buffer_capacity" is how much is currently allocated,
201
155
* "buffer_length" is how much is already used.
202
156
*/
203
__attribute__((nonnull, warn_unused_result))
204
157
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
158
size_t buffer_capacity){
206
159
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;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
213
162
return 0;
214
163
}
215
*buffer = new_buf;
216
164
buffer_capacity += BUFFER_SIZE;
217
165
}
218
166
return buffer_capacity;
219
167
}
220
168
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
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
free(new_server->ip);
244
free(new_server);
245
return false;
246
}
247
/* Special case of first server */
248
if(*current_server == NULL){
249
new_server->next = new_server;
250
new_server->prev = new_server;
251
*current_server = new_server;
252
} else {
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
256
new_server->prev->next = new_server;
257
(*current_server)->prev = new_server;
258
}
259
return true;
260
}
261
262
169
/*
263
170
* Initialize GPGME.
264
171
*/
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
269
mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
270
174
gpgme_error_t rc;
271
175
gpgme_engine_info_t engine_info;
272
176
177
273
178
/*
274
179
* Helper function to insert pub and seckey to the engine keyring.
275
180
*/
276
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
277
182
int ret;
278
183
int fd;
279
184
gpgme_data_t pgp_data;
280
185
281
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
282
187
if(fd == -1){
283
perror_plus("open");
188
perror("open");
284
189
return false;
285
190
}
286
191
287
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
288
193
if(rc != GPG_ERR_NO_ERROR){
289
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
291
196
return false;
292
197
}
293
198
294
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
295
200
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
298
203
return false;
299
204
}
300
205
301
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
302
207
if(ret == -1){
303
perror_plus("close");
208
perror("close");
304
209
}
305
210
gpgme_data_release(pgp_data);
306
211
return true;
307
212
}
308
213
309
214
if(debug){
310
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
311
216
}
312
217
313
218
/* Init GPGME */
314
219
gpgme_check_version(NULL);
315
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
316
221
if(rc != GPG_ERR_NO_ERROR){
317
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
318
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
319
224
return false;
320
225
}
321
226
322
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
323
228
rc = gpgme_get_engine_info(&engine_info);
324
229
if(rc != GPG_ERR_NO_ERROR){
325
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
326
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
327
232
return false;
328
233
}
329
234
while(engine_info != NULL){
335
240
engine_info = engine_info->next;
336
241
}
337
242
if(engine_info == NULL){
338
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
339
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
340
244
return false;
341
245
}
342
246
343
247
/* Create new GPGME "context" */
344
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
345
249
if(rc != GPG_ERR_NO_ERROR){
346
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
348
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
349
252
return false;
350
253
}
351
254
360
263
* Decrypt OpenPGP data.
361
264
* Returns -1 on error
362
265
*/
363
__attribute__((nonnull, warn_unused_result))
364
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
365
267
size_t crypto_size,
366
char **plaintext,
367
mandos_context *mc){
268
char **plaintext){
368
269
gpgme_data_t dh_crypto, dh_plain;
369
270
gpgme_error_t rc;
370
271
ssize_t ret;
372
273
ssize_t plaintext_length = 0;
373
274
374
275
if(debug){
375
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
376
277
}
377
278
378
279
/* Create new GPGME data buffer from memory cryptotext */
379
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
380
281
0);
381
282
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
384
285
return -1;
385
286
}
386
287
387
288
/* Create new empty GPGME data buffer for the plaintext */
388
289
rc = gpgme_data_new(&dh_plain);
389
290
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
392
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
393
293
gpgme_data_release(dh_crypto);
394
294
return -1;
395
295
}
396
296
397
297
/* Decrypt data from the cryptotext data buffer to the plaintext
398
298
data buffer */
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
400
300
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
403
303
plaintext_length = -1;
404
304
if(debug){
405
305
gpgme_decrypt_result_t result;
406
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
407
307
if(result == NULL){
408
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
409
309
} else {
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
414
314
if(result->file_name != NULL){
415
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
416
316
}
417
317
gpgme_recipient_t recipient;
418
318
recipient = result->recipients;
419
319
while(recipient != NULL){
420
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
424
fprintf_plus(stderr, "Secret key available: %s\n",
425
recipient->status == GPG_ERR_NO_SECKEY
426
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
427
326
recipient = recipient->next;
428
327
}
429
328
}
432
331
}
433
332
434
333
if(debug){
435
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
436
335
}
437
336
438
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
439
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
440
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
441
340
plaintext_length = -1;
442
341
goto decrypt_end;
443
342
}
445
344
*plaintext = NULL;
446
345
while(true){
447
346
plaintext_capacity = incbuffer(plaintext,
448
(size_t)plaintext_length,
449
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
450
349
if(plaintext_capacity == 0){
451
perror_plus("incbuffer");
452
plaintext_length = -1;
453
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
454
353
}
455
354
456
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
461
360
break;
462
361
}
463
362
if(ret < 0){
464
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
465
364
plaintext_length = -1;
466
365
goto decrypt_end;
467
366
}
469
368
}
470
369
471
370
if(debug){
472
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
473
372
for(ssize_t i = 0; i < plaintext_length; i++){
474
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
475
374
}
486
385
return plaintext_length;
487
386
}
488
387
489
__attribute__((warn_unused_result))
490
static const char *safer_gnutls_strerror(int value){
491
const char *ret = gnutls_strerror(value);
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
492
391
if(ret == NULL)
493
392
ret = "(unknown)";
494
393
return ret;
495
394
}
496
395
497
396
/* GnuTLS log function callback */
498
__attribute__((nonnull))
499
397
static void debuggnutls(__attribute__((unused)) int level,
500
398
const char* string){
501
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
502
400
}
503
401
504
__attribute__((nonnull, warn_unused_result))
505
402
static int init_gnutls_global(const char *pubkeyfilename,
506
const char *seckeyfilename,
507
mandos_context *mc){
403
const char *seckeyfilename){
508
404
int ret;
509
405
510
406
if(debug){
511
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
512
408
}
513
409
514
410
ret = gnutls_global_init();
515
411
if(ret != GNUTLS_E_SUCCESS){
516
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
517
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
518
414
return -1;
519
415
}
520
416
527
423
}
528
424
529
425
/* OpenPGP credentials */
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
531
427
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
534
433
gnutls_global_deinit();
535
434
return -1;
536
435
}
537
436
538
437
if(debug){
539
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
540
" secret key %s as GnuTLS credentials\n",
541
pubkeyfilename,
542
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
543
441
}
544
442
545
443
ret = gnutls_certificate_set_openpgp_key_file
546
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
547
445
GNUTLS_OPENPGP_FMT_BASE64);
548
446
if(ret != GNUTLS_E_SUCCESS){
549
fprintf_plus(stderr,
550
"Error[%d] while reading the OpenPGP key pair ('%s',"
551
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
552
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
553
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
554
452
goto globalfail;
555
453
}
556
454
557
455
/* GnuTLS server initialization */
558
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
559
457
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
" initialization: %s\n",
562
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
563
460
goto globalfail;
564
461
}
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
566
463
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
569
466
goto globalfail;
570
467
}
571
468
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
573
470
574
471
return 0;
575
472
576
473
globalfail:
577
474
578
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
579
476
gnutls_global_deinit();
580
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
581
478
return -1;
582
479
}
583
480
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
586
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
587
482
int ret;
588
483
/* GnuTLS session creation */
589
484
do {
593
488
}
594
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
595
490
if(ret != GNUTLS_E_SUCCESS){
596
fprintf_plus(stderr,
597
"Error in GnuTLS session initialization: %s\n",
598
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
599
493
}
600
494
601
495
{
602
496
const char *err;
603
497
do {
604
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
605
499
if(quit_now){
606
500
gnutls_deinit(*session);
607
501
return -1;
608
502
}
609
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
610
504
if(ret != GNUTLS_E_SUCCESS){
611
fprintf_plus(stderr, "Syntax error at: %s\n", err);
612
fprintf_plus(stderr, "GnuTLS error: %s\n",
613
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
614
508
gnutls_deinit(*session);
615
509
return -1;
616
510
}
618
512
619
513
do {
620
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
621
mc->cred);
515
mc.cred);
622
516
if(quit_now){
623
517
gnutls_deinit(*session);
624
518
return -1;
625
519
}
626
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
627
521
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
629
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
630
524
gnutls_deinit(*session);
631
525
return -1;
632
526
}
634
528
/* ignore client certificate if any. */
635
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
636
530
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
638
532
639
533
return 0;
640
534
}
644
538
__attribute__((unused)) const char *txt){}
645
539
646
540
/* Called when a Mandos server is found */
647
__attribute__((nonnull, warn_unused_result))
648
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
649
542
AvahiIfIndex if_index,
650
int af, mandos_context *mc){
543
int af){
651
544
int ret, tcp_sd = -1;
652
545
ssize_t sret;
653
struct sockaddr_storage to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
654
550
char *buffer = NULL;
655
551
char *decrypted_buffer = NULL;
656
552
size_t buffer_length = 0;
675
571
pf = PF_INET;
676
572
break;
677
573
default:
678
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
679
575
errno = EINVAL;
680
576
return -1;
681
577
}
682
578
683
/* If the interface is specified and we have a list of interfaces */
684
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
685
/* Check if the interface is one of the interfaces we are using */
686
bool match = false;
687
{
688
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
691
if(if_nametoindex(interface) == (unsigned int)if_index){
692
match = true;
693
break;
694
}
695
}
696
}
697
if(not match){
698
/* This interface does not match any in the list, so we don't
699
connect to the server */
700
if(debug){
701
char interface[IF_NAMESIZE];
702
if(if_indextoname((unsigned int)if_index, interface) == NULL){
703
perror_plus("if_indextoname");
704
} else {
705
fprintf_plus(stderr, "Skipping server on non-used interface"
706
" \"%s\"\n",
707
if_indextoname((unsigned int)if_index,
708
interface));
709
}
710
}
711
return -1;
712
}
713
}
714
715
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
716
580
if(ret != 0){
717
581
return -1;
718
582
}
719
583
720
584
if(debug){
721
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
723
587
}
724
588
725
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
726
590
if(tcp_sd < 0){
727
591
int e = errno;
728
perror_plus("socket");
592
perror("socket");
729
593
errno = e;
730
594
goto mandos_end;
731
595
}
737
601
738
602
memset(&to, 0, sizeof(to));
739
603
if(af == AF_INET6){
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
742
606
} else { /* IPv4 */
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
745
609
}
746
610
if(ret < 0 ){
747
611
int e = errno;
748
perror_plus("inet_pton");
612
perror("inet_pton");
749
613
errno = e;
750
614
goto mandos_end;
751
615
}
752
616
if(ret == 0){
753
617
int e = errno;
754
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
755
619
errno = e;
756
620
goto mandos_end;
757
621
}
758
622
if(af == AF_INET6){
759
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
760
if(IN6_IS_ADDR_LINKLOCAL
761
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
762
630
if(if_index == AVAHI_IF_UNSPEC){
763
fprintf_plus(stderr, "An IPv6 link-local address is"
764
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
765
633
errno = EINVAL;
766
634
goto mandos_end;
767
635
}
768
636
/* Set the network interface number as scope */
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
637
to.in6.sin6_scope_id = (uint32_t)if_index;
770
638
}
771
639
} else {
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
773
643
}
774
644
775
645
if(quit_now){
781
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
782
652
char interface[IF_NAMESIZE];
783
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
784
perror_plus("if_indextoname");
654
perror("if_indextoname");
785
655
} else {
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
788
658
}
789
659
} else {
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
792
662
}
793
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
794
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
795
666
if(af == AF_INET6){
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
800
669
} else {
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
804
NI_NUMERICHOST);
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
805
672
}
806
if(ret == EAI_SYSTEM){
807
perror_plus("getnameinfo");
808
} else if(ret != 0) {
809
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
810
} else if(strcmp(addrstr, ip) != 0){
811
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
812
679
}
813
680
}
814
681
818
685
}
819
686
820
687
if(af == AF_INET6){
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
823
689
} else {
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
826
691
}
827
692
if(ret < 0){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
int e = errno;
830
perror_plus("connect");
831
errno = e;
832
}
693
int e = errno;
694
perror("connect");
695
errno = e;
833
696
goto mandos_end;
834
697
}
835
698
843
706
while(true){
844
707
size_t out_size = strlen(out);
845
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
846
out_size - written));
709
out_size - written));
847
710
if(ret == -1){
848
711
int e = errno;
849
perror_plus("write");
712
perror("write");
850
713
errno = e;
851
714
goto mandos_end;
852
715
}
869
732
}
870
733
871
734
if(debug){
872
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
873
736
}
874
737
875
738
if(quit_now){
877
740
goto mandos_end;
878
741
}
879
742
880
/* This casting via intptr_t is to eliminate warning about casting
881
an int to a pointer type. This is exactly how the GnuTLS Guile
882
function "set-session-transport-fd!" does it. */
883
gnutls_transport_set_ptr(session,
884
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
885
744
886
745
if(quit_now){
887
746
errno = EINTR;
898
757
899
758
if(ret != GNUTLS_E_SUCCESS){
900
759
if(debug){
901
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
902
761
gnutls_perror(ret);
903
762
}
904
763
errno = EPROTO;
908
767
/* Read OpenPGP packet that contains the wanted password */
909
768
910
769
if(debug){
911
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
912
" %s\n", ip);
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
771
ip);
913
772
}
914
773
915
774
while(true){
920
779
}
921
780
922
781
buffer_capacity = incbuffer(&buffer, buffer_length,
923
buffer_capacity);
782
buffer_capacity);
924
783
if(buffer_capacity == 0){
925
784
int e = errno;
926
perror_plus("incbuffer");
785
perror("incbuffer");
927
786
errno = e;
928
787
goto mandos_end;
929
788
}
953
812
}
954
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
955
814
if(ret < 0){
956
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
957
"***\n");
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
958
816
gnutls_perror(ret);
959
817
errno = EPROTO;
960
818
goto mandos_end;
961
819
}
962
820
break;
963
821
default:
964
fprintf_plus(stderr, "Unknown error while reading data from"
965
" encrypted session with Mandos server\n");
822
fprintf(stderr, "Unknown error while reading data from"
823
" encrypted session with Mandos server\n");
966
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
967
825
errno = EIO;
968
826
goto mandos_end;
973
831
}
974
832
975
833
if(debug){
976
fprintf_plus(stderr, "Closing TLS session\n");
834
fprintf(stderr, "Closing TLS session\n");
977
835
}
978
836
979
837
if(quit_now){
991
849
992
850
if(buffer_length > 0){
993
851
ssize_t decrypted_buffer_size;
994
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
buffer_length,
854
&decrypted_buffer);
996
855
if(decrypted_buffer_size >= 0){
997
856
998
857
written = 0;
1008
867
if(ret == 0 and ferror(stdout)){
1009
868
int e = errno;
1010
869
if(debug){
1011
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1012
strerror(errno));
870
fprintf(stderr, "Error writing encrypted data: %s\n",
871
strerror(errno));
1013
872
}
1014
873
errno = e;
1015
874
goto mandos_end;
1034
893
if(e == 0){
1035
894
e = errno;
1036
895
}
1037
perror_plus("close");
896
perror("close");
1038
897
}
1039
898
gnutls_deinit(session);
1040
errno = e;
1041
899
if(quit_now){
1042
errno = EINTR;
900
e = EINTR;
1043
901
retval = -1;
1044
902
}
903
errno = e;
1045
904
}
1046
905
return retval;
1047
906
}
1048
907
1049
__attribute__((nonnull))
1050
908
static void resolve_callback(AvahiSServiceResolver *r,
1051
909
AvahiIfIndex interface,
1052
910
AvahiProtocol proto,
1060
918
AVAHI_GCC_UNUSED AvahiStringList *txt,
1061
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
920
flags,
1063
void *mc){
1064
if(r == NULL){
1065
return;
1066
}
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(r);
1067
923
1068
924
/* Called whenever a service has been resolved successfully or
1069
925
timed out */
1075
931
switch(event){
1076
932
default:
1077
933
case AVAHI_RESOLVER_FAILURE:
1078
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1079
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1080
domain,
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
934
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
935
" of type '%s' in domain '%s': %s\n", name, type, domain,
936
avahi_strerror(avahi_server_errno(mc.server)));
1083
937
break;
1084
938
1085
939
case AVAHI_RESOLVER_FOUND:
1087
941
char ip[AVAHI_ADDRESS_STR_MAX];
1088
942
avahi_address_snprint(ip, sizeof(ip), address);
1089
943
if(debug){
1090
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1091
PRIdMAX ") on port %" PRIu16 "\n", name,
1092
host_name, ip, (intmax_t)interface, port);
944
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
946
ip, (intmax_t)interface, port);
1093
947
}
1094
int ret = start_mandos_communication(ip, (in_port_t)port,
1095
interface,
1096
avahi_proto_to_af(proto),
1097
mc);
948
int ret = start_mandos_communication(ip, port, interface,
949
avahi_proto_to_af(proto));
1098
950
if(ret == 0){
1099
avahi_simple_poll_quit(simple_poll);
1100
} else {
1101
if(not add_server(ip, (in_port_t)port, interface,
1102
avahi_proto_to_af(proto),
1103
&((mandos_context*)mc)->current_server)){
1104
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1105
" list\n", name);
1106
}
951
avahi_simple_poll_quit(mc.simple_poll);
1107
952
}
1108
953
}
1109
954
}
1119
964
const char *domain,
1120
965
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1121
966
flags,
1122
void *mc){
1123
if(b == NULL){
1124
return;
1125
}
967
AVAHI_GCC_UNUSED void* userdata){
968
assert(b);
1126
969
1127
970
/* Called whenever a new services becomes available on the LAN or
1128
971
is removed from the LAN */
1135
978
default:
1136
979
case AVAHI_BROWSER_FAILURE:
1137
980
1138
fprintf_plus(stderr, "(Avahi browser) %s\n",
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1141
avahi_simple_poll_quit(simple_poll);
981
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
983
avahi_simple_poll_quit(mc.simple_poll);
1142
984
return;
1143
985
1144
986
case AVAHI_BROWSER_NEW:
1147
989
the callback function is called the Avahi server will free the
1148
990
resolver for us. */
1149
991
1150
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1151
interface, protocol, name, type,
1152
domain, protocol, 0,
1153
resolve_callback, mc) == NULL)
1154
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1155
" %s\n", name,
1156
avahi_strerror(avahi_server_errno
1157
(((mandos_context*)mc)->server)));
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
name, type, domain, protocol, 0,
994
resolve_callback, NULL) == NULL)
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
name, avahi_strerror(avahi_server_errno(mc.server)));
1158
997
break;
1159
998
1160
999
case AVAHI_BROWSER_REMOVE:
1163
1002
case AVAHI_BROWSER_ALL_FOR_NOW:
1164
1003
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1165
1004
if(debug){
1166
fprintf_plus(stderr, "No Mandos server found, still"
1167
" searching...\n");
1005
fprintf(stderr, "No Mandos server found, still searching...\n");
1168
1006
}
1169
1007
break;
1170
1008
}
1171
1009
}
1172
1010
1173
/* Signal handler that stops main loop after SIGTERM */
1011
/* stop main loop after sigterm has been called */
1174
1012
static void handle_sigterm(int sig){
1175
1013
if(quit_now){
1176
1014
return;
1178
1016
quit_now = 1;
1179
1017
signal_received = sig;
1180
1018
int old_errno = errno;
1181
/* set main loop to exit */
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1019
if(mc.simple_poll != NULL){
1020
avahi_simple_poll_quit(mc.simple_poll);
1184
1021
}
1185
1022
errno = old_errno;
1186
1023
}
1187
1024
1188
__attribute__((nonnull, warn_unused_result))
1189
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
int ret;
1191
error_t ret_errno;
1192
1193
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
if(s < 0){
1195
ret_errno = errno;
1196
perror_plus("socket");
1197
errno = ret_errno;
1198
return false;
1199
}
1200
strcpy(ifr->ifr_name, ifname);
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
if(ret == -1){
1203
if(debug){
1204
ret_errno = errno;
1205
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1207
}
1208
return false;
1209
}
1210
return true;
1211
}
1212
1213
__attribute__((nonnull, warn_unused_result))
1214
bool good_flags(const char *ifname, const struct ifreq *ifr){
1215
1216
/* Reject the loopback device */
1217
if(ifr->ifr_flags & IFF_LOOPBACK){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
ifname);
1221
}
1222
return false;
1223
}
1224
/* Accept point-to-point devices only if connect_to is specified */
1225
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1226
if(debug){
1227
fprintf_plus(stderr, "Accepting point-to-point interface"
1228
" \"%s\"\n", ifname);
1229
}
1230
return true;
1231
}
1232
/* Otherwise, reject non-broadcast-capable devices */
1233
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1234
if(debug){
1235
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return false;
1239
}
1240
/* Reject non-ARP interfaces (including dummy interfaces) */
1241
if(ifr->ifr_flags & IFF_NOARP){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1244
ifname);
1245
}
1246
return false;
1247
}
1248
1249
/* Accept this device */
1250
if(debug){
1251
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1252
}
1253
return true;
1254
}
1255
1256
1025
/*
1257
1026
* This function determines if a directory entry in /sys/class/net
1258
1027
* corresponds to an acceptable network device.
1259
1028
* (This function is passed to scandir(3) as a filter function.)
1260
1029
*/
1261
__attribute__((nonnull, warn_unused_result))
1262
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1263
1039
if(if_entry->d_name[0] == '.'){
1264
1040
return 0;
1265
1041
}
1266
1267
struct ifreq ifr;
1268
if(not get_flags(if_entry->d_name, &ifr)){
1269
if(debug){
1270
fprintf_plus(stderr, "Failed to get flags for interface "
1271
"\"%s\"\n", if_entry->d_name);
1272
}
1273
return 0;
1274
}
1275
1276
if(not good_flags(if_entry->d_name, &ifr)){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/*
1283
* This function determines if a network interface is up.
1284
*/
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1287
struct ifreq ifr;
1288
if(not get_flags(interface, &ifr)){
1289
if(debug){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1292
}
1293
return false;
1294
}
1295
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1297
}
1298
1299
/*
1300
* This function determines if a network interface is running
1301
*/
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1304
struct ifreq ifr;
1305
if(not get_flags(interface, &ifr)){
1306
if(debug){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1309
}
1310
return false;
1311
}
1312
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1314
}
1315
1316
__attribute__((nonnull, pure, warn_unused_result))
1317
int notdotentries(const struct dirent *direntry){
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
return 0;
1324
}
1325
return 1;
1326
}
1327
1328
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
int runnable_hook(const struct dirent *direntry){
1331
int ret;
1332
size_t sret;
1333
struct stat st;
1334
1335
if((direntry->d_name)[0] == '\0'){
1336
/* Empty name? */
1337
return 0;
1338
}
1339
1340
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
"abcdefghijklmnopqrstuvwxyz"
1342
"0123456789"
1343
"_.-");
1344
if((direntry->d_name)[sret] != '\0'){
1345
/* Contains non-allowed characters */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1348
direntry->d_name);
1349
}
1350
return 0;
1351
}
1352
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1376
1113
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1379
1116
}
1380
1117
return 1;
1381
1118
}
1382
1119
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1386
int ret;
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1390
1391
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1396
}
1397
ret = avahi_simple_poll_iterate(s, -1);
1398
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1402
}
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1405
if(ret == -1){
1406
perror_plus("clock_gettime");
1407
return -1;
1408
}
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1425
}
1426
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1432
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1434
return 0;
1435
}
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1438
if(ret == -1){
1439
perror_plus("clock_gettime");
1440
return -1;
1441
}
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1445
}
1446
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
}
1449
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1452
}
1453
}
1454
}
1455
}
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
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
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1511
const float delay){
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1517
if(debug){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1520
}
1521
} else {
1522
perror_plus("open");
1523
}
1524
return;
1525
}
1526
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1539
if(numhooks == -1){
1540
perror_plus("scandir");
1541
return;
1542
}
1543
struct dirent *direntry;
1544
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1548
if(debug){
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1550
direntry->d_name);
1551
}
1552
pid_t hook_pid = fork();
1553
if(hook_pid == 0){
1554
/* Child */
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1557
if(errno != 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
errno = ret_errno;
1737
perror_plus("Failed to raise privileges");
1738
}
1739
1740
#ifdef __linux__
1741
int ret_linux;
1742
bool restore_loglevel = false;
1743
if(ret_errno == 0){
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1749
} else {
1750
restore_loglevel = true;
1751
}
1752
}
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1756
#ifdef __linux__
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1761
}
1762
}
1763
#endif /* __linux__ */
1764
1765
/* If raise_privileges() succeeded above */
1766
if(ret_errno == 0){
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1769
if(ret_errno != 0){
1770
errno = ret_errno;
1771
perror_plus("Failed to lower privileges");
1772
}
1773
}
1774
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1784
errno = old_errno;
1785
return ioctl_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1789
interface);
1790
}
1791
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1796
break;
1797
}
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1802
}
1803
}
1804
1805
errno = old_errno;
1806
return 0;
1807
}
1808
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1822
ret_errno = errno;
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1825
errno = old_errno;
1826
return ret_errno;
1827
}
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1829
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1831
if(sd == -1){
1832
ret_errno = errno;
1833
perror_plus("socket");
1834
errno = old_errno;
1835
return ret_errno;
1836
}
1837
1838
if(debug){
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1840
interface);
1841
}
1842
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1845
if(ret_errno != 0){
1846
errno = ret_errno;
1847
perror_plus("Failed to raise privileges");
1848
}
1849
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1852
1853
/* If raise_privileges() succeeded above */
1854
if(ret_errno == 0){
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1857
if(ret_errno != 0){
1858
errno = ret_errno;
1859
perror_plus("Failed to lower privileges");
1860
}
1861
}
1862
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1865
if(ret == -1){
1866
perror_plus("close");
1867
}
1868
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1872
errno = old_errno;
1873
return ioctl_errno;
1874
}
1875
} else if(debug){
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1877
interface);
1878
}
1879
1880
errno = old_errno;
1881
return 0;
1882
}
1883
1884
1120
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1889
1121
AvahiSServiceBrowser *sb = NULL;
1890
error_t ret_errno;
1122
int error;
1891
1123
int ret;
1892
1124
intmax_t tmpmax;
1893
1125
char *tmp;
1894
1126
int exitcode = EXIT_SUCCESS;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1127
const char *interface = "";
1128
struct ifreq network;
1129
int sd = -1;
1130
bool take_down_interface = false;
1131
uid_t uid;
1132
gid_t gid;
1133
char tempdir[] = "/tmp/mandosXXXXXX";
1134
bool tempdir_created = false;
1900
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
1136
const char *seckey = PATHDIR "/" SECKEY;
1902
1137
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1904
1138
1905
1139
bool gnutls_initialized = false;
1906
1140
bool gpgme_initialized = false;
1907
1141
float delay = 2.5f;
1908
double retry_interval = 10; /* 10s between trying a server and
1909
retrying the same server again */
1910
1142
1911
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1912
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1918
1150
errno = 0;
1919
1151
ret = setgid(gid);
1920
1152
if(ret == -1){
1921
perror_plus("setgid");
1153
perror("setgid");
1922
1154
}
1923
1155
1924
1156
/* Lower user privileges (temporarily) */
1925
1157
errno = 0;
1926
1158
ret = seteuid(uid);
1927
1159
if(ret == -1){
1928
perror_plus("seteuid");
1160
perror("seteuid");
1929
1161
}
1930
1162
1931
1163
if(quit_now){
1966
1198
.arg = "SECONDS",
1967
1199
.doc = "Maximum delay to wait for interface startup",
1968
1200
.group = 2 },
1969
{ .name = "retry", .key = 132,
1970
.arg = "SECONDS",
1971
.doc = "Retry interval used when denied by the Mandos server",
1972
.group = 2 },
1973
{ .name = "network-hook-dir", .key = 133,
1974
.arg = "DIR",
1975
.doc = "Directory where network hooks are located",
1976
.group = 2 },
1977
1201
/*
1978
1202
* These reproduce what we would get without ARGP_NO_HELP
1979
1203
*/
1997
1221
connect_to = arg;
1998
1222
break;
1999
1223
case 'i': /* --interface */
2000
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2001
arg, (int)',');
2002
if(ret_errno != 0){
2003
argp_error(state, "%s", strerror(ret_errno));
2004
}
1224
interface = arg;
2005
1225
break;
2006
1226
case 's': /* --seckey */
2007
1227
seckey = arg;
2027
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
2028
1248
argp_error(state, "Bad delay");
2029
1249
}
2030
case 132: /* --retry */
2031
errno = 0;
2032
retry_interval = strtod(arg, &tmp);
2033
if(errno != 0 or tmp == arg or *tmp != '\0'
2034
or (retry_interval * 1000) > INT_MAX
2035
or retry_interval < 0){
2036
argp_error(state, "Bad retry interval");
2037
}
2038
break;
2039
case 133: /* --network-hook-dir */
2040
hookdir = arg;
2041
1250
break;
2042
1251
/*
2043
1252
* These reproduce what we would get without ARGP_NO_HELP
2050
1259
argp_state_help(state, state->out_stream,
2051
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2052
1261
case 'V': /* --version */
2053
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
2054
1263
exit(argp_err_exit_status);
2055
1264
break;
2056
1265
default:
2071
1280
case ENOMEM:
2072
1281
default:
2073
1282
errno = ret;
2074
perror_plus("argp_parse");
1283
perror("argp_parse");
2075
1284
exitcode = EX_OSERR;
2076
1285
goto end;
2077
1286
case EINVAL:
2079
1288
goto end;
2080
1289
}
2081
1290
}
2082
2083
{
2084
/* Work around Debian bug #633582:
2085
<http://bugs.debian.org/633582> */
2086
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2091
perror_plus("Failed to raise privileges");
2092
} else {
2093
struct stat st;
2094
2095
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2096
int seckey_fd = open(seckey, O_RDONLY);
2097
if(seckey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(seckey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2113
}
2114
}
2115
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2118
if(pubkey_fd == -1){
2119
perror_plus("open");
2120
} else {
2121
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2122
if(ret == -1){
2123
perror_plus("fstat");
2124
} else {
2125
if(S_ISREG(st.st_mode)
2126
and st.st_uid == 0 and st.st_gid == 0){
2127
ret = fchown(pubkey_fd, uid, gid);
2128
if(ret == -1){
2129
perror_plus("fchown");
2130
}
2131
}
2132
}
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
2137
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to lower privileges");
2142
}
2143
}
2144
}
2145
2146
/* Remove invalid interface names (except "none") */
2147
{
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2150
interface))){
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2156
}
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2158
interface = NULL;
2159
}
2160
}
2161
}
2162
2163
/* Run network hooks */
2164
{
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2169
goto end;
2170
}
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2173
}
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
2176
}
2177
1291
2178
1292
if(not debug){
2179
1293
avahi_set_log_function(empty_log);
2180
1294
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1317
goto end;
1318
}
1319
}
2181
1320
2182
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2183
1322
from the signal handler */
2184
1323
/* Initialize the pseudo-RNG for Avahi */
2185
1324
srand((unsigned int) time(NULL));
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
2188
fprintf_plus(stderr,
2189
"Avahi: Failed to create simple poll object.\n");
1325
mc.simple_poll = avahi_simple_poll_new();
1326
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2190
1328
exitcode = EX_UNAVAILABLE;
2191
1329
goto end;
2192
1330
}
2194
1332
sigemptyset(&sigterm_action.sa_mask);
2195
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2196
1334
if(ret == -1){
2197
perror_plus("sigaddset");
1335
perror("sigaddset");
2198
1336
exitcode = EX_OSERR;
2199
1337
goto end;
2200
1338
}
2201
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2202
1340
if(ret == -1){
2203
perror_plus("sigaddset");
1341
perror("sigaddset");
2204
1342
exitcode = EX_OSERR;
2205
1343
goto end;
2206
1344
}
2207
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2208
1346
if(ret == -1){
2209
perror_plus("sigaddset");
1347
perror("sigaddset");
2210
1348
exitcode = EX_OSERR;
2211
1349
goto end;
2212
1350
}
2216
1354
*/
2217
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2218
1356
if(ret == -1){
2219
perror_plus("sigaction");
1357
perror("sigaction");
2220
1358
return EX_OSERR;
2221
1359
}
2222
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
2223
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
2224
1362
if(ret == -1){
2225
perror_plus("sigaction");
1363
perror("sigaction");
2226
1364
exitcode = EX_OSERR;
2227
1365
goto end;
2228
1366
}
2229
1367
}
2230
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2231
1369
if(ret == -1){
2232
perror_plus("sigaction");
1370
perror("sigaction");
2233
1371
return EX_OSERR;
2234
1372
}
2235
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
2236
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2237
1375
if(ret == -1){
2238
perror_plus("sigaction");
1376
perror("sigaction");
2239
1377
exitcode = EX_OSERR;
2240
1378
goto end;
2241
1379
}
2242
1380
}
2243
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2244
1382
if(ret == -1){
2245
perror_plus("sigaction");
1383
perror("sigaction");
2246
1384
return EX_OSERR;
2247
1385
}
2248
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
2249
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2250
1388
if(ret == -1){
2251
perror_plus("sigaction");
1389
perror("sigaction");
2252
1390
exitcode = EX_OSERR;
2253
1391
goto end;
2254
1392
}
2255
1393
}
2256
1394
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2262
alphasort);
2263
if(ret >= 1){
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("argz_add");
2271
continue;
2272
}
2273
if(debug){
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
2276
}
2277
}
2278
free(direntries);
1395
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
if(if_index == 0){
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
1415
#ifdef __linux__
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1418
ret = klogctl(8, NULL, 5);
1419
bool restore_loglevel = true;
1420
if(ret == -1){
1421
restore_loglevel = false;
1422
perror("klogctl");
1423
}
1424
#endif /* __linux__ */
1425
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
if(sd < 0){
1428
perror("socket");
1429
exitcode = EX_OSERR;
1430
#ifdef __linux__
1431
if(restore_loglevel){
1432
ret = klogctl(7, NULL, 0);
1433
if(ret == -1){
1434
perror("klogctl");
1435
}
1436
}
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1444
goto end;
1445
}
1446
strcpy(network.ifr_name, interface);
1447
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
if(ret == -1){
1449
perror("ioctl SIOCGIFFLAGS");
1450
#ifdef __linux__
1451
if(restore_loglevel){
1452
ret = klogctl(7, NULL, 0);
1453
if(ret == -1){
1454
perror("klogctl");
1455
}
1456
}
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1465
goto end;
1466
}
1467
if((network.ifr_flags & IFF_UP) == 0){
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
if(ret == -1){
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1475
#ifdef __linux__
1476
if(restore_loglevel){
1477
ret = klogctl(7, NULL, 0);
1478
if(ret == -1){
1479
perror("klogctl");
1480
}
1481
}
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
}
1492
/* sleep checking until interface is running */
1493
for(int i=0; i < delay * 4; i++){
1494
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
1497
} else if(network.ifr_flags & IFF_RUNNING){
1498
break;
1499
}
1500
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
ret = nanosleep(&sleeptime, NULL);
1502
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1504
}
1505
}
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1512
}
1513
#ifdef __linux__
1514
if(restore_loglevel){
1515
/* Restores kernel loglevel to default */
1516
ret = klogctl(7, NULL, 0);
1517
if(ret == -1){
1518
perror("klogctl");
1519
}
1520
}
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
2279
1530
} else {
2280
if(ret == 0){
2281
free(direntries);
2282
}
2283
fprintf_plus(stderr, "Could not find a network interface\n");
2284
exitcode = EXIT_FAILURE;
2285
goto end;
2286
}
2287
}
2288
2289
/* Bring up interfaces which are down, and remove any "none"s */
2290
{
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2293
interface))){
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2298
interface);
2299
interface = NULL;
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2304
interface);
2305
interface = NULL;
2306
}
2307
}
2308
break;
2309
}
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2313
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2315
} else {
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2318
interface);
2319
if(errno != 0){
2320
perror_plus("argz_add");
2321
}
2322
}
2323
}
2324
}
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2327
}
2328
}
2329
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2332
if(debug){
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2334
mc.interfaces);
2335
}
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
1536
}
2337
1537
}
2338
1538
2339
1539
if(quit_now){
2340
1540
goto end;
2341
1541
}
2342
1542
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
1543
ret = init_gnutls_global(pubkey, seckey);
2344
1544
if(ret == -1){
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
1545
fprintf(stderr, "init_gnutls_global failed\n");
2346
1546
exitcode = EX_UNAVAILABLE;
2347
1547
goto end;
2348
1548
} else {
2353
1553
goto end;
2354
1554
}
2355
1555
2356
/* Try /run/tmp before /tmp */
2357
tempdir = mkdtemp(run_tempdir);
2358
if(tempdir == NULL and errno == ENOENT){
2359
if(debug){
2360
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2361
run_tempdir, old_tempdir);
2362
}
2363
tempdir = mkdtemp(old_tempdir);
2364
}
2365
if(tempdir == NULL){
2366
perror_plus("mkdtemp");
1556
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
perror("mkdtemp");
2367
1560
goto end;
2368
1561
}
2369
1562
2371
1564
goto end;
2372
1565
}
2373
1566
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2375
fprintf_plus(stderr, "init_gpgme failed\n");
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
fprintf(stderr, "init_gpgme failed\n");
2376
1569
exitcode = EX_UNAVAILABLE;
2377
1570
goto end;
2378
1571
} else {
2387
1580
/* Connect directly, do not use Zeroconf */
2388
1581
/* (Mainly meant for debugging) */
2389
1582
char *address = strrchr(connect_to, ':');
2390
2391
1583
if(address == NULL){
2392
fprintf_plus(stderr, "No colon in address\n");
1584
fprintf(stderr, "No colon in address\n");
2393
1585
exitcode = EX_USAGE;
2394
1586
goto end;
2395
1587
}
2398
1590
goto end;
2399
1591
}
2400
1592
2401
in_port_t port;
1593
uint16_t port;
2402
1594
errno = 0;
2403
1595
tmpmax = strtoimax(address+1, &tmp, 10);
2404
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2405
or tmpmax != (in_port_t)tmpmax){
2406
fprintf_plus(stderr, "Bad port number\n");
1597
or tmpmax != (uint16_t)tmpmax){
1598
fprintf(stderr, "Bad port number\n");
2407
1599
exitcode = EX_USAGE;
2408
1600
goto end;
2409
1601
}
2410
1602
2411
1603
if(quit_now){
2412
1604
goto end;
2413
1605
}
2414
1606
2415
port = (in_port_t)tmpmax;
1607
port = (uint16_t)tmpmax;
2416
1608
*address = '\0';
1609
address = connect_to;
2417
1610
/* Colon in address indicates IPv6 */
2418
1611
int af;
2419
if(strchr(connect_to, ':') != NULL){
1612
if(strchr(address, ':') != NULL){
2420
1613
af = AF_INET6;
2421
/* Accept [] around IPv6 address - see RFC 5952 */
2422
if(connect_to[0] == '[' and address[-1] == ']')
2423
{
2424
connect_to++;
2425
address[-1] = '\0';
2426
}
2427
1614
} else {
2428
1615
af = AF_INET;
2429
1616
}
2430
address = connect_to;
2431
1617
2432
1618
if(quit_now){
2433
1619
goto end;
2434
1620
}
2435
1621
2436
while(not quit_now){
2437
ret = start_mandos_communication(address, port, if_index, af,
2438
&mc);
2439
if(quit_now or ret == 0){
2440
break;
2441
}
2442
if(debug){
2443
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
(int)retry_interval);
2445
}
2446
sleep((unsigned int)retry_interval);
2447
}
2448
2449
if(not quit_now){
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
2450
1644
exitcode = EXIT_SUCCESS;
2451
1645
}
2452
2453
1646
goto end;
2454
1647
}
2455
1648
2467
1660
config.publish_domain = 0;
2468
1661
2469
1662
/* Allocate a new server */
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
2472
1666
2473
1667
/* Free the Avahi configuration data */
2474
1668
avahi_server_config_free(&config);
2476
1670
2477
1671
/* Check if creating the Avahi server object succeeded */
2478
1672
if(mc.server == NULL){
2479
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
2481
1675
exitcode = EX_UNAVAILABLE;
2482
1676
goto end;
2483
1677
}
2489
1683
/* Create the Avahi service browser */
2490
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
2491
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2492
NULL, 0, browse_callback,
2493
(void *)&mc);
1686
NULL, 0, browse_callback, NULL);
2494
1687
if(sb == NULL){
2495
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
avahi_strerror(avahi_server_errno(mc.server)));
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
2497
1690
exitcode = EX_UNAVAILABLE;
2498
1691
goto end;
2499
1692
}
2505
1698
/* Run the main loop */
2506
1699
2507
1700
if(debug){
2508
fprintf_plus(stderr, "Starting Avahi loop search\n");
1701
fprintf(stderr, "Starting Avahi loop search\n");
2509
1702
}
2510
1703
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
2513
if(debug){
2514
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
(ret == 0) ? "successfully" : "with error");
2516
}
1704
avahi_simple_poll_loop(mc.simple_poll);
2517
1705
2518
1706
end:
2519
1707
2520
1708
if(debug){
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1709
fprintf(stderr, "%s exiting\n", argv[0]);
2522
1710
}
2523
1711
2524
1712
/* Cleanup things */
2525
free(mc.interfaces);
2526
2527
1713
if(sb != NULL)
2528
1714
avahi_s_service_browser_free(sb);
2529
1715
2530
1716
if(mc.server != NULL)
2531
1717
avahi_server_free(mc.server);
2532
1718
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
2535
1721
2536
1722
if(gnutls_initialized){
2537
1723
gnutls_certificate_free_credentials(mc.cred);
2543
1729
gpgme_release(mc.ctx);
2544
1730
}
2545
1731
2546
/* Cleans up the circular linked list of Mandos servers the client
2547
has seen */
2548
if(mc.current_server != NULL){
2549
mc.current_server->prev->next = NULL;
2550
while(mc.current_server != NULL){
2551
server *next = mc.current_server->next;
2552
free(mc.current_server);
2553
mc.current_server = next;
2554
}
2555
}
2556
2557
/* Re-raise privileges */
2558
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
2562
perror_plus("Failed to raise privileges");
2563
} else {
2564
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2568
2569
/* Take down the network interfaces which were brought up */
2570
{
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to take down interface");
2579
}
2580
}
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2583
" down\n");
2584
}
2585
}
2586
}
2587
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
2591
perror_plus("Failed to lower privileges permanently");
2592
}
2593
}
2594
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2597
2598
/* Removes the GPGME temp directory and all files inside */
2599
if(tempdir != NULL){
2600
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2637
}
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
direntry->d_name);
1789
if(ret < 0){
1790
perror("asprintf");
1791
continue;
1792
}
1793
ret = remove(fullname);
1794
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
1797
}
1798
free(fullname);
1799
}
1800
closedir(d);
1801
}
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
2639
1805
}
2640
1806
}
2641
1807
2646
1812
&old_sigterm_action,
2647
1813
NULL));
2648
1814
if(ret == -1){
2649
perror_plus("sigaction");
1815
perror("sigaction");
2650
1816
}
2651
1817
do {
2652
1818
ret = raise(signal_received);
2653
1819
} while(ret != 0 and errno == EINTR);
2654
1820
if(ret != 0){
2655
perror_plus("raise");
1821
perror("raise");
2656
1822
abort();
2657
1823
}
2658
1824
TEMP_FAILURE_RETRY(pause());
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Version: 2.0.2.dev0