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» Revision
237.25.3
(compared to revision 237.8.8)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-02 18:22:22 UTC
- mto: (237.7.307 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150702182222-034v03mb8orwhezn
mandos-client: Minor changes to check for more error conditions.
* mandos-client.c (add_remove_local_route): Do TEMP_FAILURE_RETRY
around closing of
/dev/null. Check return
value when opening helper
directory and helper
executable.
(run_network_hooks): Cast return value of TEMP_FAILURE_RETRY to int.
Do TEMP_FAILURE_RETRY around closing of
/dev/null.
* mandos-client.c (add_remove_local_route): Do TEMP_FAILURE_RETRY
around closing of
/dev/null. Check return
value when opening helper
directory and helper
executable.
(run_network_hooks): Cast return value of TEMP_FAILURE_RETRY to int.
Do TEMP_FAILURE_RETRY around closing of
/dev/null.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
84
86
raise() */
85
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
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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() */
87
98
88
99
#ifdef __linux__
89
100
#include <sys/klog.h> /* klogctl() */
107
118
init_gnutls_session(),
108
119
GNUTLS_* */
109
120
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
112
123
113
124
/* GPGME */
114
125
#include <gpgme.h> /* All GPGME types, constants and
122
133
#define PATHDIR "/conf/conf.d/mandos"
123
134
#define SECKEY "seckey.txt"
124
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
137
126
138
bool debug = false;
127
139
static const char mandos_protocol_version[] = "1";
128
140
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
142
static const char sys_class_net[] = "/sys/class/net";
131
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;
132
159
133
160
/* Used for passing in values through the Avahi callback functions */
134
161
typedef struct {
135
AvahiSimplePoll *simple_poll;
136
162
AvahiServer *server;
137
163
gnutls_certificate_credentials_t cred;
138
164
unsigned int dh_bits;
139
165
gnutls_dh_params_t dh_params;
140
166
const char *priority;
141
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
142
171
} mandos_context;
143
172
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" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
148
175
149
176
sig_atomic_t quit_now = 0;
150
177
int signal_received = 0;
151
178
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
152
198
/*
153
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
200
* bytes. "buffer_capacity" is how much is currently allocated,
155
201
* "buffer_length" is how much is already used.
156
202
*/
203
__attribute__((nonnull, warn_unused_result))
157
204
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
205
size_t buffer_capacity){
159
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
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;
162
213
return 0;
163
214
}
215
*buffer = new_buf;
164
216
buffer_capacity += BUFFER_SIZE;
165
217
}
166
218
return buffer_capacity;
167
219
}
168
220
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
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
169
269
/*
170
270
* Initialize GPGME.
171
271
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
174
277
gpgme_error_t rc;
175
278
gpgme_engine_info_t engine_info;
176
279
177
178
280
/*
179
281
* Helper function to insert pub and seckey to the engine keyring.
180
282
*/
181
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
182
284
int ret;
183
285
int fd;
184
286
gpgme_data_t pgp_data;
185
287
186
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
289
if(fd == -1){
188
perror("open");
290
perror_plus("open");
189
291
return false;
190
292
}
191
293
192
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
295
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
196
298
return false;
197
299
}
198
300
199
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
200
302
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
203
305
return false;
204
306
}
205
307
206
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
309
if(ret == -1){
208
perror("close");
310
perror_plus("close");
209
311
}
210
312
gpgme_data_release(pgp_data);
211
313
return true;
212
314
}
213
315
214
316
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
216
318
}
217
319
218
320
/* Init GPGME */
219
321
gpgme_check_version(NULL);
220
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
323
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
224
326
return false;
225
327
}
226
328
227
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
228
330
rc = gpgme_get_engine_info(&engine_info);
229
331
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
232
334
return false;
233
335
}
234
336
while(engine_info != NULL){
240
342
engine_info = engine_info->next;
241
343
}
242
344
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
244
347
return false;
245
348
}
246
349
247
350
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
249
352
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
252
356
return false;
253
357
}
254
358
263
367
* Decrypt OpenPGP data.
264
368
* Returns -1 on error
265
369
*/
370
__attribute__((nonnull, warn_unused_result))
266
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
372
size_t crypto_size,
268
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
269
375
gpgme_data_t dh_crypto, dh_plain;
270
376
gpgme_error_t rc;
271
377
ssize_t ret;
273
379
ssize_t plaintext_length = 0;
274
380
275
381
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
383
}
278
384
279
385
/* Create new GPGME data buffer from memory cryptotext */
280
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
387
0);
282
388
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
285
391
return -1;
286
392
}
287
393
288
394
/* Create new empty GPGME data buffer for the plaintext */
289
395
rc = gpgme_data_new(&dh_plain);
290
396
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
293
400
gpgme_data_release(dh_crypto);
294
401
return -1;
295
402
}
296
403
297
404
/* Decrypt data from the cryptotext data buffer to the plaintext
298
405
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
407
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
303
410
plaintext_length = -1;
304
411
if(debug){
305
412
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
307
414
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
416
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
314
421
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
423
}
317
424
gpgme_recipient_t recipient;
318
425
recipient = result->recipients;
319
426
while(recipient != NULL){
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
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
326
434
recipient = recipient->next;
327
435
}
328
436
}
331
439
}
332
440
333
441
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
443
}
336
444
337
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
340
448
plaintext_length = -1;
341
449
goto decrypt_end;
342
450
}
344
452
*plaintext = NULL;
345
453
while(true){
346
454
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
349
457
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
353
461
}
354
462
355
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
468
break;
361
469
}
362
470
if(ret < 0){
363
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
364
472
plaintext_length = -1;
365
473
goto decrypt_end;
366
474
}
368
476
}
369
477
370
478
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
372
480
for(ssize_t i = 0; i < plaintext_length; i++){
373
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
482
}
385
493
return plaintext_length;
386
494
}
387
495
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
391
499
if(ret == NULL)
392
500
ret = "(unknown)";
393
501
return ret;
394
502
}
395
503
396
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
397
506
static void debuggnutls(__attribute__((unused)) int level,
398
507
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
400
509
}
401
510
511
__attribute__((nonnull, warn_unused_result))
402
512
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
404
515
int ret;
405
516
406
517
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
519
}
409
520
410
521
ret = gnutls_global_init();
411
522
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
414
525
return -1;
415
526
}
416
527
423
534
}
424
535
425
536
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
427
538
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
433
541
gnutls_global_deinit();
434
542
return -1;
435
543
}
436
544
437
545
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
441
550
}
442
551
443
552
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
445
554
GNUTLS_OPENPGP_FMT_BASE64);
446
555
if(ret != GNUTLS_E_SUCCESS){
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));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
452
561
goto globalfail;
453
562
}
454
563
455
564
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
457
566
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
460
570
goto globalfail;
461
571
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
463
573
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
466
576
goto globalfail;
467
577
}
468
578
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
580
471
581
return 0;
472
582
473
583
globalfail:
474
584
475
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
476
586
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
478
588
return -1;
479
589
}
480
590
481
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
482
594
int ret;
483
595
/* GnuTLS session creation */
484
596
do {
488
600
}
489
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
602
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
493
606
}
494
607
495
608
{
496
609
const char *err;
497
610
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
499
612
if(quit_now){
500
613
gnutls_deinit(*session);
501
614
return -1;
502
615
}
503
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
617
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
508
621
gnutls_deinit(*session);
509
622
return -1;
510
623
}
512
625
513
626
do {
514
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
628
mc->cred);
516
629
if(quit_now){
517
630
gnutls_deinit(*session);
518
631
return -1;
519
632
}
520
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
634
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
524
637
gnutls_deinit(*session);
525
638
return -1;
526
639
}
528
641
/* ignore client certificate if any. */
529
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
530
643
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
532
645
533
646
return 0;
534
647
}
537
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
538
651
__attribute__((unused)) const char *txt){}
539
652
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char remove_arg[] = "remove";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
716
if(debug){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
719
}
720
return false;
721
}
722
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
726
return false;
727
}
728
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
730
if(devnull == -1){
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
732
return false;
733
}
734
pid_t pid = fork();
735
if(pid == 0){
736
/* Child */
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
739
if(errno != 0){
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
742
} else {
743
/* Set group */
744
errno = 0;
745
ret = setgid(0);
746
if(ret == -1){
747
perror_plus("setgid");
748
_exit(EX_NOPERM);
749
}
750
/* Reset supplementary groups */
751
errno = 0;
752
ret = setgroups(0, NULL);
753
if(ret == -1){
754
perror_plus("setgroups");
755
_exit(EX_NOPERM);
756
}
757
}
758
ret = dup2(devnull, STDIN_FILENO);
759
if(ret == -1){
760
perror_plus("dup2(devnull, STDIN_FILENO)");
761
_exit(EX_OSERR);
762
}
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
764
if(ret == -1){
765
perror_plus("close");
766
_exit(EX_OSERR);
767
}
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
769
if(ret == -1){
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
771
_exit(EX_OSERR);
772
}
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
774
O_RDONLY
775
| O_DIRECTORY
776
| O_PATH
777
| O_CLOEXEC));
778
if(helperdir_fd == -1){
779
perror_plus("open");
780
_exit(EX_UNAVAILABLE);
781
}
782
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
783
helper, O_RDONLY));
784
if(helper_fd == -1){
785
perror_plus("openat");
786
_exit(EX_UNAVAILABLE);
787
}
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
789
#ifdef __GNUC__
790
#pragma GCC diagnostic push
791
#pragma GCC diagnostic ignored "-Wcast-qual"
792
#endif
793
if(fexecve(helper_fd, (char *const [])
794
{ helper, add ? add_arg : remove_arg, (char *)address,
795
interface, NULL }, environ) == -1){
796
#ifdef __GNUC__
797
#pragma GCC diagnostic pop
798
#endif
799
perror_plus("fexecve");
800
_exit(EXIT_FAILURE);
801
}
802
}
803
if(pid == -1){
804
perror_plus("fork");
805
return false;
806
}
807
int status;
808
pid_t pret = -1;
809
errno = 0;
810
do {
811
pret = waitpid(pid, &status, 0);
812
if(pret == -1 and errno == EINTR and quit_now){
813
int errno_raising = 0;
814
if((errno = raise_privileges()) != 0){
815
errno_raising = errno;
816
perror_plus("Failed to raise privileges in order to"
817
" kill helper program");
818
}
819
if(kill(pid, SIGTERM) == -1){
820
perror_plus("kill");
821
}
822
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
823
perror_plus("Failed to lower privileges after killing"
824
" helper program");
825
}
826
return false;
827
}
828
} while(pret == -1 and errno == EINTR);
829
if(pret == -1){
830
perror_plus("waitpid");
831
return false;
832
}
833
if(WIFEXITED(status)){
834
if(WEXITSTATUS(status) != 0){
835
fprintf_plus(stderr, "Error: iprouteadddel exited"
836
" with status %d\n", WEXITSTATUS(status));
837
return false;
838
}
839
return true;
840
}
841
if(WIFSIGNALED(status)){
842
fprintf_plus(stderr, "Error: iprouteadddel died by"
843
" signal %d\n", WTERMSIG(status));
844
return false;
845
}
846
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
847
return false;
848
}
849
850
__attribute__((nonnull, warn_unused_result))
851
static bool add_local_route(const char *address,
852
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
854
}
855
856
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
858
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
860
}
861
540
862
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
863
__attribute__((nonnull, warn_unused_result))
864
static int start_mandos_communication(const char *ip, in_port_t port,
542
865
AvahiIfIndex if_index,
543
int af){
866
int af, mandos_context *mc){
544
867
int ret, tcp_sd = -1;
545
868
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
869
struct sockaddr_storage to;
550
870
char *buffer = NULL;
551
871
char *decrypted_buffer = NULL;
552
872
size_t buffer_length = 0;
555
875
int retval = -1;
556
876
gnutls_session_t session;
557
877
int pf; /* Protocol family */
878
bool route_added = false;
558
879
559
880
errno = 0;
560
881
571
892
pf = PF_INET;
572
893
break;
573
894
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
895
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
896
errno = EINVAL;
576
897
return -1;
577
898
}
578
899
579
ret = init_gnutls_session(&session);
900
/* If the interface is specified and we have a list of interfaces */
901
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
902
/* Check if the interface is one of the interfaces we are using */
903
bool match = false;
904
{
905
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
908
if(if_nametoindex(interface) == (unsigned int)if_index){
909
match = true;
910
break;
911
}
912
}
913
}
914
if(not match){
915
/* This interface does not match any in the list, so we don't
916
connect to the server */
917
if(debug){
918
char interface[IF_NAMESIZE];
919
if(if_indextoname((unsigned int)if_index, interface) == NULL){
920
perror_plus("if_indextoname");
921
} else {
922
fprintf_plus(stderr, "Skipping server on non-used interface"
923
" \"%s\"\n",
924
if_indextoname((unsigned int)if_index,
925
interface));
926
}
927
}
928
return -1;
929
}
930
}
931
932
ret = init_gnutls_session(&session, mc);
580
933
if(ret != 0){
581
934
return -1;
582
935
}
583
936
584
937
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
938
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
939
PRIuMAX "\n", ip, (uintmax_t)port);
587
940
}
588
941
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
942
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
590
943
if(tcp_sd < 0){
591
944
int e = errno;
592
perror("socket");
945
perror_plus("socket");
593
946
errno = e;
594
947
goto mandos_end;
595
948
}
601
954
602
955
memset(&to, 0, sizeof(to));
603
956
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
606
959
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
609
962
}
610
963
if(ret < 0 ){
611
964
int e = errno;
612
perror("inet_pton");
965
perror_plus("inet_pton");
613
966
errno = e;
614
967
goto mandos_end;
615
968
}
616
969
if(ret == 0){
617
970
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
971
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
972
errno = e;
620
973
goto mandos_end;
621
974
}
622
975
if(af == AF_INET6){
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*/
976
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
977
if(IN6_IS_ADDR_LINKLOCAL
978
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
630
979
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
980
fprintf_plus(stderr, "An IPv6 link-local address is"
981
" incomplete without a network interface\n");
633
982
errno = EINVAL;
634
983
goto mandos_end;
635
984
}
636
985
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
986
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
638
987
}
639
988
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
989
((struct sockaddr_in *)&to)->sin_port = htons(port);
643
990
}
644
991
645
992
if(quit_now){
651
998
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
999
char interface[IF_NAMESIZE];
653
1000
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
1001
perror_plus("if_indextoname");
655
1002
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
1003
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1004
"\n", ip, interface, (uintmax_t)port);
658
1005
}
659
1006
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
1007
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1008
ip, (uintmax_t)port);
662
1009
}
663
1010
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
1011
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
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
}
679
}
680
}
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
1012
if(af == AF_INET6){
1013
ret = getnameinfo((struct sockaddr *)&to,
1014
sizeof(struct sockaddr_in6),
1015
addrstr, sizeof(addrstr), NULL, 0,
1016
NI_NUMERICHOST);
1017
} else {
1018
ret = getnameinfo((struct sockaddr *)&to,
1019
sizeof(struct sockaddr_in),
1020
addrstr, sizeof(addrstr), NULL, 0,
1021
NI_NUMERICHOST);
1022
}
1023
if(ret == EAI_SYSTEM){
1024
perror_plus("getnameinfo");
1025
} else if(ret != 0) {
1026
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1027
} else if(strcmp(addrstr, ip) != 0){
1028
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1029
}
1030
}
1031
1032
if(quit_now){
1033
errno = EINTR;
1034
goto mandos_end;
1035
}
1036
1037
while(true){
1038
if(af == AF_INET6){
1039
ret = connect(tcp_sd, (struct sockaddr *)&to,
1040
sizeof(struct sockaddr_in6));
1041
} else {
1042
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1043
sizeof(struct sockaddr_in));
1044
}
1045
if(ret < 0){
1046
if(errno == ENETUNREACH
1047
and if_index != AVAHI_IF_UNSPEC
1048
and connect_to == NULL
1049
and not route_added and
1050
((af == AF_INET6 and not
1051
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1052
&to)->sin6_addr)))
1053
or (af == AF_INET and
1054
/* Not a a IPv4LL address */
1055
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1056
& 0xFFFF0000L) != 0xA9FE0000L))){
1057
/* Work around Avahi bug - Avahi does not announce link-local
1058
addresses if it has a global address, so local hosts with
1059
*only* a link-local address (e.g. Mandos clients) cannot
1060
connect to a Mandos server announced by Avahi on a server
1061
host with a global address. Work around this by retrying
1062
with an explicit route added with the server's address.
1063
1064
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
https://bugs.debian.org/587961
1067
*/
1068
int e = errno;
1069
route_added = add_local_route(ip, if_index);
1070
if(route_added){
1071
continue;
1072
}
1073
errno = e;
1074
}
1075
if(errno != ECONNREFUSED or debug){
1076
int e = errno;
1077
perror_plus("connect");
1078
errno = e;
1079
}
1080
goto mandos_end;
1081
}
1082
1083
if(quit_now){
1084
errno = EINTR;
1085
goto mandos_end;
1086
}
1087
break;
704
1088
}
705
1089
706
1090
const char *out = mandos_protocol_version;
708
1092
while(true){
709
1093
size_t out_size = strlen(out);
710
1094
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
1095
out_size - written));
712
1096
if(ret == -1){
713
1097
int e = errno;
714
perror("write");
1098
perror_plus("write");
715
1099
errno = e;
716
1100
goto mandos_end;
717
1101
}
734
1118
}
735
1119
736
1120
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1121
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
1122
}
739
1123
740
1124
if(quit_now){
742
1126
goto mandos_end;
743
1127
}
744
1128
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1129
/* This casting via intptr_t is to eliminate warning about casting
1130
an int to a pointer type. This is exactly how the GnuTLS Guile
1131
function "set-session-transport-fd!" does it. */
1132
gnutls_transport_set_ptr(session,
1133
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
746
1134
747
1135
if(quit_now){
748
1136
errno = EINTR;
759
1147
760
1148
if(ret != GNUTLS_E_SUCCESS){
761
1149
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1150
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
1151
gnutls_perror(ret);
764
1152
}
765
1153
errno = EPROTO;
769
1157
/* Read OpenPGP packet that contains the wanted password */
770
1158
771
1159
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
1160
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1161
" %s\n", ip);
774
1162
}
775
1163
776
1164
while(true){
781
1169
}
782
1170
783
1171
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
1172
buffer_capacity);
785
1173
if(buffer_capacity == 0){
786
1174
int e = errno;
787
perror("incbuffer");
1175
perror_plus("incbuffer");
788
1176
errno = e;
789
1177
goto mandos_end;
790
1178
}
814
1202
}
815
1203
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
1204
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1205
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1206
"***\n");
818
1207
gnutls_perror(ret);
819
1208
errno = EPROTO;
820
1209
goto mandos_end;
821
1210
}
822
1211
break;
823
1212
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
1213
fprintf_plus(stderr, "Unknown error while reading data from"
1214
" encrypted session with Mandos server\n");
826
1215
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
1216
errno = EIO;
828
1217
goto mandos_end;
833
1222
}
834
1223
835
1224
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
1225
fprintf_plus(stderr, "Closing TLS session\n");
837
1226
}
838
1227
839
1228
if(quit_now){
851
1240
852
1241
if(buffer_length > 0){
853
1242
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
1243
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1244
&decrypted_buffer, mc);
857
1245
if(decrypted_buffer_size >= 0){
858
1246
859
1247
written = 0;
869
1257
if(ret == 0 and ferror(stdout)){
870
1258
int e = errno;
871
1259
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
1260
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1261
strerror(errno));
874
1262
}
875
1263
errno = e;
876
1264
goto mandos_end;
885
1273
886
1274
mandos_end:
887
1275
{
1276
if(route_added){
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1279
" interface %d", ip, if_index);
1280
}
1281
}
888
1282
int e = errno;
889
1283
free(decrypted_buffer);
890
1284
free(buffer);
895
1289
if(e == 0){
896
1290
e = errno;
897
1291
}
898
perror("close");
1292
perror_plus("close");
899
1293
}
900
1294
gnutls_deinit(session);
1295
errno = e;
901
1296
if(quit_now){
902
e = EINTR;
1297
errno = EINTR;
903
1298
retval = -1;
904
1299
}
905
errno = e;
906
1300
}
907
1301
return retval;
908
1302
}
909
1303
1304
__attribute__((nonnull))
910
1305
static void resolve_callback(AvahiSServiceResolver *r,
911
1306
AvahiIfIndex interface,
912
1307
AvahiProtocol proto,
920
1315
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
1316
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
1317
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1318
void *mc){
1319
if(r == NULL){
1320
return;
1321
}
925
1322
926
1323
/* Called whenever a service has been resolved successfully or
927
1324
timed out */
928
1325
929
1326
if(quit_now){
1327
avahi_s_service_resolver_free(r);
930
1328
return;
931
1329
}
932
1330
933
1331
switch(event){
934
1332
default:
935
1333
case AVAHI_RESOLVER_FAILURE:
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1334
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1335
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1336
domain,
1337
avahi_strerror(avahi_server_errno
1338
(((mandos_context*)mc)->server)));
939
1339
break;
940
1340
941
1341
case AVAHI_RESOLVER_FOUND:
943
1343
char ip[AVAHI_ADDRESS_STR_MAX];
944
1344
avahi_address_snprint(ip, sizeof(ip), address);
945
1345
if(debug){
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1346
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1347
PRIdMAX ") on port %" PRIu16 "\n", name,
1348
host_name, ip, (intmax_t)interface, port);
949
1349
}
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1350
int ret = start_mandos_communication(ip, (in_port_t)port,
1351
interface,
1352
avahi_proto_to_af(proto),
1353
mc);
952
1354
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
1355
avahi_simple_poll_quit(simple_poll);
1356
} else {
1357
if(not add_server(ip, (in_port_t)port, interface,
1358
avahi_proto_to_af(proto),
1359
&((mandos_context*)mc)->current_server)){
1360
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1361
" list\n", name);
1362
}
954
1363
}
955
1364
}
956
1365
}
966
1375
const char *domain,
967
1376
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
1377
flags,
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1378
void *mc){
1379
if(b == NULL){
1380
return;
1381
}
971
1382
972
1383
/* Called whenever a new services becomes available on the LAN or
973
1384
is removed from the LAN */
980
1391
default:
981
1392
case AVAHI_BROWSER_FAILURE:
982
1393
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1394
fprintf_plus(stderr, "(Avahi browser) %s\n",
1395
avahi_strerror(avahi_server_errno
1396
(((mandos_context*)mc)->server)));
1397
avahi_simple_poll_quit(simple_poll);
986
1398
return;
987
1399
988
1400
case AVAHI_BROWSER_NEW:
991
1403
the callback function is called the Avahi server will free the
992
1404
resolver for us. */
993
1405
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1406
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1407
interface, protocol, name, type,
1408
domain, protocol, 0,
1409
resolve_callback, mc) == NULL)
1410
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1411
" %s\n", name,
1412
avahi_strerror(avahi_server_errno
1413
(((mandos_context*)mc)->server)));
999
1414
break;
1000
1415
1001
1416
case AVAHI_BROWSER_REMOVE:
1004
1419
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1420
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1421
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1422
fprintf_plus(stderr, "No Mandos server found, still"
1423
" searching...\n");
1008
1424
}
1009
1425
break;
1010
1426
}
1011
1427
}
1012
1428
1013
/* stop main loop after sigterm has been called */
1429
/* Signal handler that stops main loop after SIGTERM */
1014
1430
static void handle_sigterm(int sig){
1015
1431
if(quit_now){
1016
1432
return;
1018
1434
quit_now = 1;
1019
1435
signal_received = sig;
1020
1436
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1437
/* set main loop to exit */
1438
if(simple_poll != NULL){
1439
avahi_simple_poll_quit(simple_poll);
1023
1440
}
1024
1441
errno = old_errno;
1025
1442
}
1026
1443
1444
__attribute__((nonnull, warn_unused_result))
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1446
int ret;
1447
error_t ret_errno;
1448
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1450
if(s < 0){
1451
ret_errno = errno;
1452
perror_plus("socket");
1453
errno = ret_errno;
1454
return false;
1455
}
1456
strcpy(ifr->ifr_name, ifname);
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1458
if(ret == -1){
1459
if(debug){
1460
ret_errno = errno;
1461
perror_plus("ioctl SIOCGIFFLAGS");
1462
errno = ret_errno;
1463
}
1464
return false;
1465
}
1466
return true;
1467
}
1468
1469
__attribute__((nonnull, warn_unused_result))
1470
bool good_flags(const char *ifname, const struct ifreq *ifr){
1471
1472
/* Reject the loopback device */
1473
if(ifr->ifr_flags & IFF_LOOPBACK){
1474
if(debug){
1475
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1476
ifname);
1477
}
1478
return false;
1479
}
1480
/* Accept point-to-point devices only if connect_to is specified */
1481
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1482
if(debug){
1483
fprintf_plus(stderr, "Accepting point-to-point interface"
1484
" \"%s\"\n", ifname);
1485
}
1486
return true;
1487
}
1488
/* Otherwise, reject non-broadcast-capable devices */
1489
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1490
if(debug){
1491
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1492
" \"%s\"\n", ifname);
1493
}
1494
return false;
1495
}
1496
/* Reject non-ARP interfaces (including dummy interfaces) */
1497
if(ifr->ifr_flags & IFF_NOARP){
1498
if(debug){
1499
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1500
ifname);
1501
}
1502
return false;
1503
}
1504
1505
/* Accept this device */
1506
if(debug){
1507
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1508
}
1509
return true;
1510
}
1511
1027
1512
/*
1028
1513
* This function determines if a directory entry in /sys/class/net
1029
1514
* corresponds to an acceptable network device.
1030
1515
* (This function is passed to scandir(3) as a filter function.)
1031
1516
*/
1517
__attribute__((nonnull, warn_unused_result))
1032
1518
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
1519
if(if_entry->d_name[0] == '.'){
1042
1520
return 0;
1043
1521
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1522
1523
struct ifreq ifr;
1524
if(not get_flags(if_entry->d_name, &ifr)){
1525
if(debug){
1526
fprintf_plus(stderr, "Failed to get flags for interface "
1527
"\"%s\"\n", if_entry->d_name);
1528
}
1529
return 0;
1530
}
1531
1532
if(not good_flags(if_entry->d_name, &ifr)){
1533
return 0;
1534
}
1535
return 1;
1536
}
1537
1538
/*
1539
* This function determines if a network interface is up.
1540
*/
1541
__attribute__((nonnull, warn_unused_result))
1542
bool interface_is_up(const char *interface){
1543
struct ifreq ifr;
1544
if(not get_flags(interface, &ifr)){
1545
if(debug){
1546
fprintf_plus(stderr, "Failed to get flags for interface "
1547
"\"%s\"\n", interface);
1548
}
1549
return false;
1550
}
1551
1552
return (bool)(ifr.ifr_flags & IFF_UP);
1553
}
1554
1555
/*
1556
* This function determines if a network interface is running
1557
*/
1558
__attribute__((nonnull, warn_unused_result))
1559
bool interface_is_running(const char *interface){
1560
struct ifreq ifr;
1561
if(not get_flags(interface, &ifr)){
1562
if(debug){
1563
fprintf_plus(stderr, "Failed to get flags for interface "
1564
"\"%s\"\n", interface);
1565
}
1566
return false;
1567
}
1568
1569
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1570
}
1571
1572
__attribute__((nonnull, pure, warn_unused_result))
1573
int notdotentries(const struct dirent *direntry){
1574
/* Skip "." and ".." */
1575
if(direntry->d_name[0] == '.'
1576
and (direntry->d_name[1] == '\0'
1577
or (direntry->d_name[1] == '.'
1578
and direntry->d_name[2] == '\0'))){
1579
return 0;
1580
}
1581
return 1;
1582
}
1583
1584
/* Is this directory entry a runnable program? */
1585
__attribute__((nonnull, warn_unused_result))
1586
int runnable_hook(const struct dirent *direntry){
1587
int ret;
1588
size_t sret;
1589
struct stat st;
1590
1591
if((direntry->d_name)[0] == '\0'){
1592
/* Empty name? */
1593
return 0;
1594
}
1595
1596
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1597
"abcdefghijklmnopqrstuvwxyz"
1598
"0123456789"
1599
"_.-");
1600
if((direntry->d_name)[sret] != '\0'){
1601
/* Contains non-allowed characters */
1602
if(debug){
1603
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1604
direntry->d_name);
1605
}
1606
return 0;
1607
}
1608
1609
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1610
if(ret == -1){
1611
if(debug){
1612
perror_plus("Could not stat hook");
1613
}
1614
return 0;
1615
}
1616
if(not (S_ISREG(st.st_mode))){
1617
/* Not a regular file */
1618
if(debug){
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1620
direntry->d_name);
1621
}
1622
return 0;
1623
}
1624
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1625
/* Not executable */
1626
if(debug){
1627
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1628
direntry->d_name);
1629
}
1630
return 0;
1631
}
1632
if(debug){
1633
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1634
direntry->d_name);
1635
}
1636
return 1;
1637
}
1638
1639
__attribute__((nonnull, warn_unused_result))
1640
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1641
mandos_context *mc){
1642
int ret;
1643
struct timespec now;
1644
struct timespec waited_time;
1645
intmax_t block_time;
1646
1647
while(true){
1648
if(mc->current_server == NULL){
1649
if(debug){
1650
fprintf_plus(stderr, "Wait until first server is found."
1651
" No timeout!\n");
1652
}
1653
ret = avahi_simple_poll_iterate(s, -1);
1654
} else {
1655
if(debug){
1656
fprintf_plus(stderr, "Check current_server if we should run"
1657
" it, or wait\n");
1658
}
1659
/* the current time */
1660
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1661
if(ret == -1){
1662
perror_plus("clock_gettime");
1663
return -1;
1664
}
1665
/* Calculating in ms how long time between now and server
1666
who we visted longest time ago. Now - last seen. */
1667
waited_time.tv_sec = (now.tv_sec
1668
- mc->current_server->last_seen.tv_sec);
1669
waited_time.tv_nsec = (now.tv_nsec
1670
- mc->current_server->last_seen.tv_nsec);
1671
/* total time is 10s/10,000ms.
1672
Converting to s from ms by dividing by 1,000,
1673
and ns to ms by dividing by 1,000,000. */
1674
block_time = ((retry_interval
1675
- ((intmax_t)waited_time.tv_sec * 1000))
1676
- ((intmax_t)waited_time.tv_nsec / 1000000));
1677
1678
if(debug){
1679
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1680
block_time);
1681
}
1682
1683
if(block_time <= 0){
1684
ret = start_mandos_communication(mc->current_server->ip,
1685
mc->current_server->port,
1686
mc->current_server->if_index,
1687
mc->current_server->af, mc);
1688
if(ret == 0){
1689
avahi_simple_poll_quit(s);
1690
return 0;
1691
}
1692
ret = clock_gettime(CLOCK_MONOTONIC,
1693
&mc->current_server->last_seen);
1694
if(ret == -1){
1695
perror_plus("clock_gettime");
1696
return -1;
1697
}
1698
mc->current_server = mc->current_server->next;
1699
block_time = 0; /* Call avahi to find new Mandos
1700
servers, but don't block */
1701
}
1702
1703
ret = avahi_simple_poll_iterate(s, (int)block_time);
1704
}
1705
if(ret != 0){
1706
if(ret > 0 or errno != EINTR){
1707
return (ret != 1) ? ret : 0;
1708
}
1709
}
1710
}
1711
}
1712
1713
__attribute__((nonnull))
1714
void run_network_hooks(const char *mode, const char *interface,
1715
const float delay){
1716
struct dirent **direntries = NULL;
1717
if(hookdir_fd == -1){
1718
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1719
| O_CLOEXEC);
1720
if(hookdir_fd == -1){
1721
if(errno == ENOENT){
1722
if(debug){
1723
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1724
" found\n", hookdir);
1725
}
1726
} else {
1727
perror_plus("open");
1728
}
1729
return;
1730
}
1731
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1744
if(numhooks == -1){
1745
perror_plus("scandir");
1746
return;
1747
}
1748
struct dirent *direntry;
1749
int ret;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1751
if(devnull == -1){
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1753
return;
1754
}
1755
for(int i = 0; i < numhooks; i++){
1756
direntry = direntries[i];
1757
if(debug){
1758
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1759
direntry->d_name);
1760
}
1761
pid_t hook_pid = fork();
1762
if(hook_pid == 0){
1763
/* Child */
1764
/* Raise privileges */
1765
errno = raise_privileges_permanently();
1766
if(errno != 0){
1767
perror_plus("Failed to raise privileges");
1768
_exit(EX_NOPERM);
1769
}
1770
/* Set group */
1771
errno = 0;
1772
ret = setgid(0);
1773
if(ret == -1){
1774
perror_plus("setgid");
1775
_exit(EX_NOPERM);
1776
}
1777
/* Reset supplementary groups */
1778
errno = 0;
1779
ret = setgroups(0, NULL);
1780
if(ret == -1){
1781
perror_plus("setgroups");
1782
_exit(EX_NOPERM);
1783
}
1784
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1785
if(ret == -1){
1786
perror_plus("setenv");
1787
_exit(EX_OSERR);
1788
}
1789
ret = setenv("DEVICE", interface, 1);
1790
if(ret == -1){
1791
perror_plus("setenv");
1792
_exit(EX_OSERR);
1793
}
1794
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1795
if(ret == -1){
1796
perror_plus("setenv");
1797
_exit(EX_OSERR);
1798
}
1799
ret = setenv("MODE", mode, 1);
1800
if(ret == -1){
1801
perror_plus("setenv");
1802
_exit(EX_OSERR);
1803
}
1804
char *delaystring;
1805
ret = asprintf(&delaystring, "%f", (double)delay);
1806
if(ret == -1){
1807
perror_plus("asprintf");
1808
_exit(EX_OSERR);
1809
}
1810
ret = setenv("DELAY", delaystring, 1);
1811
if(ret == -1){
1812
free(delaystring);
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
free(delaystring);
1817
if(connect_to != NULL){
1818
ret = setenv("CONNECT", connect_to, 1);
1819
if(ret == -1){
1820
perror_plus("setenv");
1821
_exit(EX_OSERR);
1822
}
1823
}
1824
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1825
direntry->d_name,
1826
O_RDONLY));
1827
if(hook_fd == -1){
1828
perror_plus("openat");
1829
_exit(EXIT_FAILURE);
1830
}
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1832
perror_plus("close");
1833
_exit(EXIT_FAILURE);
1834
}
1835
ret = dup2(devnull, STDIN_FILENO);
1836
if(ret == -1){
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
1838
_exit(EX_OSERR);
1839
}
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1841
if(ret == -1){
1842
perror_plus("close");
1843
_exit(EX_OSERR);
1844
}
1845
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1846
if(ret == -1){
1847
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1848
_exit(EX_OSERR);
1849
}
1850
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1851
environ) == -1){
1852
perror_plus("fexecve");
1853
_exit(EXIT_FAILURE);
1854
}
1855
} else {
1856
if(hook_pid == -1){
1857
perror_plus("fork");
1858
free(direntry);
1859
continue;
1860
}
1861
int status;
1862
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1863
perror_plus("waitpid");
1864
free(direntry);
1865
continue;
1866
}
1867
if(WIFEXITED(status)){
1868
if(WEXITSTATUS(status) != 0){
1869
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1870
" with status %d\n", direntry->d_name,
1871
WEXITSTATUS(status));
1872
free(direntry);
1873
continue;
1874
}
1875
} else if(WIFSIGNALED(status)){
1876
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1877
" signal %d\n", direntry->d_name,
1878
WTERMSIG(status));
1879
free(direntry);
1880
continue;
1881
} else {
1882
fprintf_plus(stderr, "Warning: network hook \"%s\""
1883
" crashed\n", direntry->d_name);
1884
free(direntry);
1885
continue;
1886
}
1887
}
1888
if(debug){
1889
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1890
direntry->d_name);
1891
}
1892
free(direntry);
1893
}
1894
free(direntries);
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1896
perror_plus("close");
1897
} else {
1898
hookdir_fd = -1;
1899
}
1900
close(devnull);
1901
}
1902
1903
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
1907
int ret;
1908
struct ifreq network;
1909
unsigned int if_index = if_nametoindex(interface);
1910
if(if_index == 0){
1911
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1912
errno = old_errno;
1913
return ENXIO;
1914
}
1915
1916
if(quit_now){
1917
errno = old_errno;
1918
return EINTR;
1919
}
1920
1921
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
1923
if(not get_flags(interface, &network)){
1924
ret_errno = errno;
1925
fprintf_plus(stderr, "Failed to get flags for interface "
1926
"\"%s\"\n", interface);
1927
errno = old_errno;
1928
return ret_errno;
1929
}
1930
network.ifr_flags |= IFF_UP; /* set flag */
1931
1932
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd == -1){
1934
ret_errno = errno;
1935
perror_plus("socket");
1936
errno = old_errno;
1937
return ret_errno;
1938
}
1939
1940
if(quit_now){
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1942
if(ret == -1){
1943
perror_plus("close");
1944
}
1945
errno = old_errno;
1946
return EINTR;
1947
}
1948
1949
if(debug){
1950
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1951
interface);
1952
}
1953
1954
/* Raise privileges */
1955
ret_errno = raise_privileges();
1956
if(ret_errno != 0){
1957
errno = ret_errno;
1958
perror_plus("Failed to raise privileges");
1959
}
1960
1961
#ifdef __linux__
1962
int ret_linux;
1963
bool restore_loglevel = false;
1964
if(ret_errno == 0){
1965
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1966
messages about the network interface to mess up the prompt */
1967
ret_linux = klogctl(8, NULL, 5);
1968
if(ret_linux == -1){
1969
perror_plus("klogctl");
1970
} else {
1971
restore_loglevel = true;
1972
}
1973
}
1974
#endif /* __linux__ */
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
#ifdef __linux__
1978
if(restore_loglevel){
1979
ret_linux = klogctl(7, NULL, 0);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
}
1983
}
1984
#endif /* __linux__ */
1985
1986
/* If raise_privileges() succeeded above */
1987
if(ret_errno == 0){
1988
/* Lower privileges */
1989
ret_errno = lower_privileges();
1990
if(ret_errno != 0){
1991
errno = ret_errno;
1992
perror_plus("Failed to lower privileges");
1993
}
1994
}
1995
1996
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1998
if(ret == -1){
1999
perror_plus("close");
2000
}
2001
2002
if(ret_setflags == -1){
2003
errno = ioctl_errno;
2004
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2005
errno = old_errno;
2006
return ioctl_errno;
2007
}
2008
} else if(debug){
2009
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2010
interface);
2011
}
2012
2013
/* Sleep checking until interface is running.
2014
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2016
if(interface_is_running(interface)){
1070
2017
break;
1071
2018
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
2019
struct timespec sleeptime = { .tv_nsec = 250000000 };
2020
ret = nanosleep(&sleeptime, NULL);
2021
if(ret == -1 and errno != EINTR){
2022
perror_plus("nanosleep");
2023
}
2024
}
2025
2026
errno = old_errno;
2027
return 0;
2028
}
2029
2030
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2033
struct ifreq network;
2034
unsigned int if_index = if_nametoindex(interface);
2035
if(if_index == 0){
2036
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2037
errno = old_errno;
2038
return ENXIO;
2039
}
2040
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network) and debug){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(debug){
2060
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2061
interface);
2062
}
2063
2064
/* Raise privileges */
2065
ret_errno = raise_privileges();
2066
if(ret_errno != 0){
2067
errno = ret_errno;
2068
perror_plus("Failed to raise privileges");
2069
}
2070
2071
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2072
ioctl_errno = errno;
2073
2074
/* If raise_privileges() succeeded above */
2075
if(ret_errno == 0){
2076
/* Lower privileges */
2077
ret_errno = lower_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to lower privileges");
2081
}
2082
}
2083
2084
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2086
if(ret == -1){
2087
perror_plus("close");
2088
}
2089
2090
if(ret_setflags == -1){
2091
errno = ioctl_errno;
2092
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2093
errno = old_errno;
2094
return ioctl_errno;
2095
}
2096
} else if(debug){
2097
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2098
interface);
2099
}
2100
2101
errno = old_errno;
2102
return 0;
1120
2103
}
1121
2104
1122
2105
int main(int argc, char *argv[]){
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
1123
2110
AvahiSServiceBrowser *sb = NULL;
1124
int error;
2111
error_t ret_errno;
1125
2112
int ret;
1126
2113
intmax_t tmpmax;
1127
2114
char *tmp;
1128
2115
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1136
bool tempdir_created = false;
2116
char *interfaces_to_take_down = NULL;
2117
size_t interfaces_to_take_down_size = 0;
2118
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2119
char old_tempdir[] = "/tmp/mandosXXXXXX";
2120
char *tempdir = NULL;
1137
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
2122
const char *seckey = PATHDIR "/" SECKEY;
1139
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2124
char *interfaces_hooks = NULL;
1140
2125
1141
2126
bool gnutls_initialized = false;
1142
2127
bool gpgme_initialized = false;
1143
2128
float delay = 2.5f;
2129
double retry_interval = 10; /* 10s between trying a server and
2130
retrying the same server again */
1144
2131
1145
2132
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
2133
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
2139
errno = 0;
1153
2140
ret = setgid(gid);
1154
2141
if(ret == -1){
1155
perror("setgid");
2142
perror_plus("setgid");
1156
2143
}
1157
2144
1158
2145
/* Lower user privileges (temporarily) */
1159
2146
errno = 0;
1160
2147
ret = seteuid(uid);
1161
2148
if(ret == -1){
1162
perror("seteuid");
2149
perror_plus("seteuid");
1163
2150
}
1164
2151
1165
2152
if(quit_now){
1200
2187
.arg = "SECONDS",
1201
2188
.doc = "Maximum delay to wait for interface startup",
1202
2189
.group = 2 },
2190
{ .name = "retry", .key = 132,
2191
.arg = "SECONDS",
2192
.doc = "Retry interval used when denied by the Mandos server",
2193
.group = 2 },
2194
{ .name = "network-hook-dir", .key = 133,
2195
.arg = "DIR",
2196
.doc = "Directory where network hooks are located",
2197
.group = 2 },
1203
2198
/*
1204
2199
* These reproduce what we would get without ARGP_NO_HELP
1205
2200
*/
1223
2218
connect_to = arg;
1224
2219
break;
1225
2220
case 'i': /* --interface */
1226
interface = arg;
2221
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2222
arg, (int)',');
2223
if(ret_errno != 0){
2224
argp_error(state, "%s", strerror(ret_errno));
2225
}
1227
2226
break;
1228
2227
case 's': /* --seckey */
1229
2228
seckey = arg;
1249
2248
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
2249
argp_error(state, "Bad delay");
1251
2250
}
2251
case 132: /* --retry */
2252
errno = 0;
2253
retry_interval = strtod(arg, &tmp);
2254
if(errno != 0 or tmp == arg or *tmp != '\0'
2255
or (retry_interval * 1000) > INT_MAX
2256
or retry_interval < 0){
2257
argp_error(state, "Bad retry interval");
2258
}
2259
break;
2260
case 133: /* --network-hook-dir */
2261
hookdir = arg;
1252
2262
break;
1253
2263
/*
1254
2264
* These reproduce what we would get without ARGP_NO_HELP
1261
2271
argp_state_help(state, state->out_stream,
1262
2272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
2273
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
2274
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
2275
exit(argp_err_exit_status);
1266
2276
break;
1267
2277
default:
1282
2292
case ENOMEM:
1283
2293
default:
1284
2294
errno = ret;
1285
perror("argp_parse");
2295
perror_plus("argp_parse");
1286
2296
exitcode = EX_OSERR;
1287
2297
goto end;
1288
2298
case EINVAL:
1291
2301
}
1292
2302
}
1293
2303
2304
{
2305
/* Work around Debian bug #633582:
2306
<http://bugs.debian.org/633582> */
2307
2308
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2312
perror_plus("Failed to raise privileges");
2313
} else {
2314
struct stat st;
2315
2316
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2317
int seckey_fd = open(seckey, O_RDONLY);
2318
if(seckey_fd == -1){
2319
perror_plus("open");
2320
} else {
2321
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2322
if(ret == -1){
2323
perror_plus("fstat");
2324
} else {
2325
if(S_ISREG(st.st_mode)
2326
and st.st_uid == 0 and st.st_gid == 0){
2327
ret = fchown(seckey_fd, uid, gid);
2328
if(ret == -1){
2329
perror_plus("fchown");
2330
}
2331
}
2332
}
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2334
}
2335
}
2336
2337
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2338
int pubkey_fd = open(pubkey, O_RDONLY);
2339
if(pubkey_fd == -1){
2340
perror_plus("open");
2341
} else {
2342
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2343
if(ret == -1){
2344
perror_plus("fstat");
2345
} else {
2346
if(S_ISREG(st.st_mode)
2347
and st.st_uid == 0 and st.st_gid == 0){
2348
ret = fchown(pubkey_fd, uid, gid);
2349
if(ret == -1){
2350
perror_plus("fchown");
2351
}
2352
}
2353
}
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2355
}
2356
}
2357
2358
/* Lower privileges */
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2362
perror_plus("Failed to lower privileges");
2363
}
2364
}
2365
}
2366
2367
/* Remove invalid interface names (except "none") */
2368
{
2369
char *interface = NULL;
2370
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2371
interface))){
2372
if(strcmp(interface, "none") != 0
2373
and if_nametoindex(interface) == 0){
2374
if(interface[0] != '\0'){
2375
fprintf_plus(stderr, "Not using nonexisting interface"
2376
" \"%s\"\n", interface);
2377
}
2378
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2379
interface = NULL;
2380
}
2381
}
2382
}
2383
2384
/* Run network hooks */
2385
{
2386
if(mc.interfaces != NULL){
2387
interfaces_hooks = malloc(mc.interfaces_size);
2388
if(interfaces_hooks == NULL){
2389
perror_plus("malloc");
2390
goto end;
2391
}
2392
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2393
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2394
}
2395
run_network_hooks("start", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
}
2398
1294
2399
if(not debug){
1295
2400
avahi_set_log_function(empty_log);
1296
2401
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
1322
2402
1323
2403
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
2404
from the signal handler */
1325
2405
/* Initialize the pseudo-RNG for Avahi */
1326
2406
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2407
simple_poll = avahi_simple_poll_new();
2408
if(simple_poll == NULL){
2409
fprintf_plus(stderr,
2410
"Avahi: Failed to create simple poll object.\n");
1330
2411
exitcode = EX_UNAVAILABLE;
1331
2412
goto end;
1332
2413
}
1334
2415
sigemptyset(&sigterm_action.sa_mask);
1335
2416
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
2417
if(ret == -1){
1337
perror("sigaddset");
2418
perror_plus("sigaddset");
1338
2419
exitcode = EX_OSERR;
1339
2420
goto end;
1340
2421
}
1341
2422
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
2423
if(ret == -1){
1343
perror("sigaddset");
2424
perror_plus("sigaddset");
1344
2425
exitcode = EX_OSERR;
1345
2426
goto end;
1346
2427
}
1347
2428
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
2429
if(ret == -1){
1349
perror("sigaddset");
2430
perror_plus("sigaddset");
1350
2431
exitcode = EX_OSERR;
1351
2432
goto end;
1352
2433
}
1356
2437
*/
1357
2438
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
2439
if(ret == -1){
1359
perror("sigaction");
2440
perror_plus("sigaction");
1360
2441
return EX_OSERR;
1361
2442
}
1362
2443
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
2444
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
2445
if(ret == -1){
1365
perror("sigaction");
2446
perror_plus("sigaction");
1366
2447
exitcode = EX_OSERR;
1367
2448
goto end;
1368
2449
}
1369
2450
}
1370
2451
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
2452
if(ret == -1){
1372
perror("sigaction");
2453
perror_plus("sigaction");
1373
2454
return EX_OSERR;
1374
2455
}
1375
2456
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
2457
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
2458
if(ret == -1){
1378
perror("sigaction");
2459
perror_plus("sigaction");
1379
2460
exitcode = EX_OSERR;
1380
2461
goto end;
1381
2462
}
1382
2463
}
1383
2464
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
2465
if(ret == -1){
1385
perror("sigaction");
2466
perror_plus("sigaction");
1386
2467
return EX_OSERR;
1387
2468
}
1388
2469
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
2470
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
2471
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
2472
perror_plus("sigaction");
2473
exitcode = EX_OSERR;
2474
goto end;
2475
}
2476
}
2477
2478
/* If no interfaces were specified, make a list */
2479
if(mc.interfaces == NULL){
2480
struct dirent **direntries = NULL;
2481
/* Look for any good interfaces */
2482
ret = scandir(sys_class_net, &direntries, good_interface,
2483
alphasort);
2484
if(ret >= 1){
2485
/* Add all found interfaces to interfaces list */
2486
for(int i = 0; i < ret; ++i){
2487
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2488
direntries[i]->d_name);
2489
if(ret_errno != 0){
2490
errno = ret_errno;
2491
perror_plus("argz_add");
2492
free(direntries[i]);
2493
continue;
2494
}
2495
if(debug){
2496
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2497
direntries[i]->d_name);
2498
}
2499
free(direntries[i]);
2500
}
2501
free(direntries);
2502
} else {
2503
if(ret == 0){
2504
free(direntries);
2505
}
2506
fprintf_plus(stderr, "Could not find a network interface\n");
2507
exitcode = EXIT_FAILURE;
2508
goto end;
2509
}
2510
}
2511
2512
/* Bring up interfaces which are down, and remove any "none"s */
2513
{
2514
char *interface = NULL;
2515
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2516
interface))){
2517
/* If interface name is "none", stop bringing up interfaces.
2518
Also remove all instances of "none" from the list */
2519
if(strcmp(interface, "none") == 0){
2520
argz_delete(&mc.interfaces, &mc.interfaces_size,
2521
interface);
2522
interface = NULL;
2523
while((interface = argz_next(mc.interfaces,
2524
mc.interfaces_size, interface))){
2525
if(strcmp(interface, "none") == 0){
2526
argz_delete(&mc.interfaces, &mc.interfaces_size,
2527
interface);
2528
interface = NULL;
1482
2529
}
1483
2530
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
2531
break;
1501
2532
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
2533
bool interface_was_up = interface_is_up(interface);
2534
errno = bring_up_interface(interface, delay);
2535
if(not interface_was_up){
2536
if(errno != 0){
2537
perror_plus("Failed to bring up interface");
2538
} else {
2539
errno = argz_add(&interfaces_to_take_down,
2540
&interfaces_to_take_down_size,
2541
interface);
2542
if(errno != 0){
2543
perror_plus("argz_add");
2544
}
2545
}
2546
}
2547
}
2548
if(debug and (interfaces_to_take_down == NULL)){
2549
fprintf_plus(stderr, "No interfaces were brought up\n");
2550
}
2551
}
2552
2553
/* If we only got one interface, explicitly use only that one */
2554
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2555
if(debug){
2556
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2557
mc.interfaces);
2558
}
2559
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1539
2560
}
1540
2561
1541
2562
if(quit_now){
1542
2563
goto end;
1543
2564
}
1544
2565
1545
ret = init_gnutls_global(pubkey, seckey);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
1546
2567
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2569
exitcode = EX_UNAVAILABLE;
1549
2570
goto end;
1550
2571
} else {
1555
2576
goto end;
1556
2577
}
1557
2578
1558
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
2579
/* Try /run/tmp before /tmp */
2580
tempdir = mkdtemp(run_tempdir);
2581
if(tempdir == NULL and errno == ENOENT){
2582
if(debug){
2583
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2584
run_tempdir, old_tempdir);
2585
}
2586
tempdir = mkdtemp(old_tempdir);
2587
}
2588
if(tempdir == NULL){
2589
perror_plus("mkdtemp");
1562
2590
goto end;
1563
2591
}
1564
2592
1566
2594
goto end;
1567
2595
}
1568
2596
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2597
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2598
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2599
exitcode = EX_UNAVAILABLE;
1572
2600
goto end;
1573
2601
} else {
1582
2610
/* Connect directly, do not use Zeroconf */
1583
2611
/* (Mainly meant for debugging) */
1584
2612
char *address = strrchr(connect_to, ':');
2613
1585
2614
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2615
fprintf_plus(stderr, "No colon in address\n");
1587
2616
exitcode = EX_USAGE;
1588
2617
goto end;
1589
2618
}
1592
2621
goto end;
1593
2622
}
1594
2623
1595
uint16_t port;
2624
in_port_t port;
1596
2625
errno = 0;
1597
2626
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2627
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2628
or tmpmax != (in_port_t)tmpmax){
2629
fprintf_plus(stderr, "Bad port number\n");
1601
2630
exitcode = EX_USAGE;
1602
2631
goto end;
1603
2632
}
1604
2633
1605
2634
if(quit_now){
1606
2635
goto end;
1607
2636
}
1608
2637
1609
port = (uint16_t)tmpmax;
2638
port = (in_port_t)tmpmax;
1610
2639
*address = '\0';
1611
address = connect_to;
1612
2640
/* Colon in address indicates IPv6 */
1613
2641
int af;
1614
if(strchr(address, ':') != NULL){
2642
if(strchr(connect_to, ':') != NULL){
1615
2643
af = AF_INET6;
2644
/* Accept [] around IPv6 address - see RFC 5952 */
2645
if(connect_to[0] == '[' and address[-1] == ']')
2646
{
2647
connect_to++;
2648
address[-1] = '\0';
2649
}
1616
2650
} else {
1617
2651
af = AF_INET;
1618
2652
}
2653
address = connect_to;
1619
2654
1620
2655
if(quit_now){
1621
2656
goto end;
1622
2657
}
1623
2658
1624
2659
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
2660
ret = start_mandos_communication(address, port, if_index, af,
2661
&mc);
1626
2662
if(quit_now or ret == 0){
1627
2663
break;
1628
2664
}
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
2665
if(debug){
2666
fprintf_plus(stderr, "Retrying in %d seconds\n",
2667
(int)retry_interval);
2668
}
2669
sleep((unsigned int)retry_interval);
2670
}
2671
2672
if(not quit_now){
1633
2673
exitcode = EXIT_SUCCESS;
1634
2674
}
1635
2675
1636
2676
goto end;
1637
2677
}
1638
2678
1650
2690
config.publish_domain = 0;
1651
2691
1652
2692
/* Allocate a new server */
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2694
&config, NULL, NULL, &ret_errno);
1656
2695
1657
2696
/* Free the Avahi configuration data */
1658
2697
avahi_server_config_free(&config);
1660
2699
1661
2700
/* Check if creating the Avahi server object succeeded */
1662
2701
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2703
avahi_strerror(ret_errno));
1665
2704
exitcode = EX_UNAVAILABLE;
1666
2705
goto end;
1667
2706
}
1673
2712
/* Create the Avahi service browser */
1674
2713
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
2714
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
NULL, 0, browse_callback, NULL);
2715
NULL, 0, browse_callback,
2716
(void *)&mc);
1677
2717
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2718
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2719
avahi_strerror(avahi_server_errno(mc.server)));
1680
2720
exitcode = EX_UNAVAILABLE;
1681
2721
goto end;
1682
2722
}
1688
2728
/* Run the main loop */
1689
2729
1690
2730
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
2731
fprintf_plus(stderr, "Starting Avahi loop search\n");
1692
2732
}
1693
2733
1694
avahi_simple_poll_loop(mc.simple_poll);
2734
ret = avahi_loop_with_timeout(simple_poll,
2735
(int)(retry_interval * 1000), &mc);
2736
if(debug){
2737
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2738
(ret == 0) ? "successfully" : "with error");
2739
}
1695
2740
1696
2741
end:
1697
2742
1698
2743
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2745
}
1701
2746
1702
2747
/* Cleanup things */
2748
free(mc.interfaces);
2749
1703
2750
if(sb != NULL)
1704
2751
avahi_s_service_browser_free(sb);
1705
2752
1706
2753
if(mc.server != NULL)
1707
2754
avahi_server_free(mc.server);
1708
2755
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2756
if(simple_poll != NULL)
2757
avahi_simple_poll_free(simple_poll);
1711
2758
1712
2759
if(gnutls_initialized){
1713
2760
gnutls_certificate_free_credentials(mc.cred);
1719
2766
gpgme_release(mc.ctx);
1720
2767
}
1721
2768
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
/* Removes the temp directory used by GPGME */
1755
if(tempdir_created){
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
1776
char *fullname = NULL;
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
direntry->d_name);
1779
if(ret < 0){
1780
perror("asprintf");
1781
continue;
1782
}
1783
ret = remove(fullname);
1784
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
1787
}
1788
free(fullname);
1789
}
1790
closedir(d);
1791
}
1792
ret = rmdir(tempdir);
1793
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2769
/* Cleans up the circular linked list of Mandos servers the client
2770
has seen */
2771
if(mc.current_server != NULL){
2772
mc.current_server->prev->next = NULL;
2773
while(mc.current_server != NULL){
2774
server *next = mc.current_server->next;
2775
#ifdef __GNUC__
2776
#pragma GCC diagnostic push
2777
#pragma GCC diagnostic ignored "-Wcast-qual"
2778
#endif
2779
free((char *)(mc.current_server->ip));
2780
#ifdef __GNUC__
2781
#pragma GCC diagnostic pop
2782
#endif
2783
free(mc.current_server);
2784
mc.current_server = next;
2785
}
2786
}
2787
2788
/* Re-raise privileges */
2789
{
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
2793
perror_plus("Failed to raise privileges");
2794
} else {
2795
2796
/* Run network hooks */
2797
run_network_hooks("stop", interfaces_hooks != NULL ?
2798
interfaces_hooks : "", delay);
2799
2800
/* Take down the network interfaces which were brought up */
2801
{
2802
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2805
interface))){
2806
ret_errno = take_down_interface(interface);
2807
if(ret_errno != 0){
2808
errno = ret_errno;
2809
perror_plus("Failed to take down interface");
2810
}
2811
}
2812
if(debug and (interfaces_to_take_down == NULL)){
2813
fprintf_plus(stderr, "No interfaces needed to be taken"
2814
" down\n");
2815
}
2816
}
2817
}
2818
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
2822
perror_plus("Failed to lower privileges permanently");
2823
}
2824
}
2825
2826
free(interfaces_to_take_down);
2827
free(interfaces_hooks);
2828
2829
/* Removes the GPGME temp directory and all files inside */
2830
if(tempdir != NULL){
2831
struct dirent **direntries = NULL;
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2871
}
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
1795
2873
}
1796
2874
}
1797
2875
1802
2880
&old_sigterm_action,
1803
2881
NULL));
1804
2882
if(ret == -1){
1805
perror("sigaction");
2883
perror_plus("sigaction");
1806
2884
}
1807
2885
do {
1808
2886
ret = raise(signal_received);
1809
2887
} while(ret != 0 and errno == EINTR);
1810
2888
if(ret != 0){
1811
perror("raise");
2889
perror_plus("raise");
1812
2890
abort();
1813
2891
}
1814
2892
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0