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- Committer: Teddy Hogeborn
- Date: 2018-02-10 13:23:58 UTC
- Revision ID: teddy@recompile.se-20180210132358-8pfvo9vshq9l32y5
Remove unnecessary text left from old example init.d file
* init.d-mandos: Remove unnecessary text left from old example init.d
file.
* init.d-mandos: Remove unnecessary text left from old example init.d
file.
- files added:
- bugs.xml
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
55
57
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
80
87
argp_state, struct argp,
85
92
raise() */
86
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
88
104
89
105
#ifdef __linux__
90
106
#include <sys/klog.h> /* klogctl() */
108
124
init_gnutls_session(),
109
125
GNUTLS_* */
110
126
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
113
129
114
130
/* GPGME */
115
131
#include <gpgme.h> /* All GPGME types, constants and
131
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
148
static const char sys_class_net[] = "/sys/class/net";
133
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
134
154
135
155
/* Doubly linked list that need to be circularly linked when used */
136
156
typedef struct server{
137
157
const char *ip;
138
uint16_t port;
158
in_port_t port;
139
159
AvahiIfIndex if_index;
140
160
int af;
141
161
struct timespec last_seen;
145
165
146
166
/* Used for passing in values through the Avahi callback functions */
147
167
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
168
AvahiServer *server;
150
169
gnutls_certificate_credentials_t cred;
151
170
unsigned int dh_bits;
153
172
const char *priority;
154
173
gpgme_ctx_t ctx;
155
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
156
177
} mandos_context;
157
178
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
163
181
164
182
sig_atomic_t quit_now = 0;
165
183
int signal_received = 0;
166
184
167
185
/* Function to use when printing errors */
168
186
void perror_plus(const char *print_text){
187
int e = errno;
169
188
fprintf(stderr, "Mandos plugin %s: ",
170
189
program_invocation_short_name);
190
errno = e;
171
191
perror(print_text);
172
192
}
173
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
174
195
int fprintf_plus(FILE *stream, const char *format, ...){
175
196
va_list ap;
176
197
va_start (ap, format);
177
198
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
179
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
180
202
}
181
203
182
204
/*
184
206
* bytes. "buffer_capacity" is how much is currently allocated,
185
207
* "buffer_length" is how much is already used.
186
208
*/
209
__attribute__((nonnull, warn_unused_result))
187
210
size_t incbuffer(char **buffer, size_t buffer_length,
188
size_t buffer_capacity){
211
size_t buffer_capacity){
189
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
190
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
191
if(buffer == NULL){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
192
219
return 0;
193
220
}
221
*buffer = new_buf;
194
222
buffer_capacity += BUFFER_SIZE;
195
223
}
196
224
return buffer_capacity;
197
225
}
198
226
199
227
/* Add server to set of servers to retry periodically */
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
int af){
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
203
231
int ret;
204
232
server *new_server = malloc(sizeof(server));
205
233
if(new_server == NULL){
206
234
perror_plus("malloc");
207
return -1;
235
return false;
208
236
}
209
237
*new_server = (server){ .ip = strdup(ip),
210
.port = port,
211
.if_index = if_index,
212
.af = af };
238
.port = port,
239
.if_index = if_index,
240
.af = af };
213
241
if(new_server->ip == NULL){
214
242
perror_plus("strdup");
215
return -1;
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
216
259
}
217
260
/* Special case of first server */
218
if (mc.current_server == NULL){
261
if(*current_server == NULL){
219
262
new_server->next = new_server;
220
263
new_server->prev = new_server;
221
mc.current_server = new_server;
222
/* Place the new server last in the list */
264
*current_server = new_server;
223
265
} else {
224
new_server->next = mc.current_server;
225
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
226
269
new_server->prev->next = new_server;
227
mc.current_server->prev = new_server;
228
}
229
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
if(ret == -1){
231
perror_plus("clock_gettime");
232
return -1;
233
}
234
return 0;
270
(*current_server)->prev = new_server;
271
}
272
return true;
235
273
}
236
274
237
275
/*
238
276
* Initialize GPGME.
239
277
*/
240
static bool init_gpgme(const char *seckey,
241
const char *pubkey, const char *tempdir){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
242
283
gpgme_error_t rc;
243
284
gpgme_engine_info_t engine_info;
244
285
245
246
286
/*
247
287
* Helper function to insert pub and seckey to the engine keyring.
248
288
*/
249
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
250
290
int ret;
251
291
int fd;
252
292
gpgme_data_t pgp_data;
259
299
260
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
261
301
if(rc != GPG_ERR_NO_ERROR){
262
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
263
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
264
304
return false;
265
305
}
266
306
267
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
268
308
if(rc != GPG_ERR_NO_ERROR){
269
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
271
311
return false;
272
312
}
273
313
274
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
275
315
if(ret == -1){
276
316
perror_plus("close");
277
317
}
280
320
}
281
321
282
322
if(debug){
283
fprintf(stderr, "Initializing GPGME\n");
323
fprintf_plus(stderr, "Initializing GPGME\n");
284
324
}
285
325
286
326
/* Init GPGME */
287
327
gpgme_check_version(NULL);
288
328
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
289
329
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
292
332
return false;
293
333
}
294
334
295
335
/* Set GPGME home directory for the OpenPGP engine only */
296
336
rc = gpgme_get_engine_info(&engine_info);
297
337
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
300
340
return false;
301
341
}
302
342
while(engine_info != NULL){
308
348
engine_info = engine_info->next;
309
349
}
310
350
if(engine_info == NULL){
311
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
312
353
return false;
313
354
}
314
355
315
356
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
317
358
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "bad gpgme_new: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
320
362
return false;
321
363
}
322
364
331
373
* Decrypt OpenPGP data.
332
374
* Returns -1 on error
333
375
*/
376
__attribute__((nonnull, warn_unused_result))
334
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
335
378
size_t crypto_size,
336
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
337
381
gpgme_data_t dh_crypto, dh_plain;
338
382
gpgme_error_t rc;
339
383
ssize_t ret;
341
385
ssize_t plaintext_length = 0;
342
386
343
387
if(debug){
344
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
389
}
346
390
347
391
/* Create new GPGME data buffer from memory cryptotext */
348
392
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
349
393
0);
350
394
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
353
397
return -1;
354
398
}
355
399
356
400
/* Create new empty GPGME data buffer for the plaintext */
357
401
rc = gpgme_data_new(&dh_plain);
358
402
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
361
406
gpgme_data_release(dh_crypto);
362
407
return -1;
363
408
}
364
409
365
410
/* Decrypt data from the cryptotext data buffer to the plaintext
366
411
data buffer */
367
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
368
413
if(rc != GPG_ERR_NO_ERROR){
369
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
371
416
plaintext_length = -1;
372
417
if(debug){
373
418
gpgme_decrypt_result_t result;
374
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
375
420
if(result == NULL){
376
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
377
422
} else {
378
fprintf(stderr, "Unsupported algorithm: %s\n",
379
result->unsupported_algorithm);
380
fprintf(stderr, "Wrong key usage: %u\n",
381
result->wrong_key_usage);
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
382
427
if(result->file_name != NULL){
383
fprintf(stderr, "File name: %s\n", result->file_name);
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
384
429
}
385
430
gpgme_recipient_t recipient;
386
431
recipient = result->recipients;
387
432
while(recipient != NULL){
388
fprintf(stderr, "Public key algorithm: %s\n",
389
gpgme_pubkey_algo_name(recipient->pubkey_algo));
390
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
391
fprintf(stderr, "Secret key available: %s\n",
392
recipient->status == GPG_ERR_NO_SECKEY
393
? "No" : "Yes");
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
394
440
recipient = recipient->next;
395
441
}
396
442
}
399
445
}
400
446
401
447
if(debug){
402
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
448
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
403
449
}
404
450
405
451
/* Seek back to the beginning of the GPGME plaintext data buffer */
412
458
*plaintext = NULL;
413
459
while(true){
414
460
plaintext_capacity = incbuffer(plaintext,
415
(size_t)plaintext_length,
416
plaintext_capacity);
461
(size_t)plaintext_length,
462
plaintext_capacity);
417
463
if(plaintext_capacity == 0){
418
perror_plus("incbuffer");
419
plaintext_length = -1;
420
goto decrypt_end;
464
perror_plus("incbuffer");
465
plaintext_length = -1;
466
goto decrypt_end;
421
467
}
422
468
423
469
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
482
}
437
483
438
484
if(debug){
439
fprintf(stderr, "Decrypted password is: ");
485
fprintf_plus(stderr, "Decrypted password is: ");
440
486
for(ssize_t i = 0; i < plaintext_length; i++){
441
487
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
442
488
}
453
499
return plaintext_length;
454
500
}
455
501
456
static const char * safer_gnutls_strerror(int value){
457
const char *ret = gnutls_strerror(value); /* Spurious warning from
458
-Wunreachable-code */
459
if(ret == NULL)
460
ret = "(unknown)";
461
return ret;
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
462
513
}
463
514
464
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
465
517
static void debuggnutls(__attribute__((unused)) int level,
466
518
const char* string){
467
fprintf(stderr, "GnuTLS: %s", string);
519
fprintf_plus(stderr, "GnuTLS: %s", string);
468
520
}
469
521
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
470
523
static int init_gnutls_global(const char *pubkeyfilename,
471
const char *seckeyfilename){
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
472
527
int ret;
528
unsigned int uret;
473
529
474
530
if(debug){
475
fprintf(stderr, "Initializing GnuTLS\n");
476
}
477
478
ret = gnutls_global_init();
479
if(ret != GNUTLS_E_SUCCESS){
480
fprintf(stderr, "GnuTLS global_init: %s\n",
481
safer_gnutls_strerror(ret));
482
return -1;
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
483
532
}
484
533
485
534
if(debug){
491
540
}
492
541
493
542
/* OpenPGP credentials */
494
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
495
544
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "GnuTLS memory error: %s\n",
497
safer_gnutls_strerror(ret));
498
gnutls_global_deinit();
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
499
547
return -1;
500
548
}
501
549
502
550
if(debug){
503
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
504
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
505
seckeyfilename);
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
506
555
}
507
556
508
557
ret = gnutls_certificate_set_openpgp_key_file
509
(mc.cred, pubkeyfilename, seckeyfilename,
558
(mc->cred, pubkeyfilename, seckeyfilename,
510
559
GNUTLS_OPENPGP_FMT_BASE64);
511
560
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr,
513
"Error[%d] while reading the OpenPGP key pair ('%s',"
514
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
515
fprintf(stderr, "The GnuTLS error is: %s\n",
516
safer_gnutls_strerror(ret));
561
fprintf_plus(stderr,
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
517
566
goto globalfail;
518
567
}
519
568
520
569
/* GnuTLS server initialization */
521
ret = gnutls_dh_params_init(&mc.dh_params);
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
524
" %s\n", safer_gnutls_strerror(ret));
525
goto globalfail;
526
}
527
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
530
safer_gnutls_strerror(ret));
531
goto globalfail;
532
}
533
534
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
575
goto globalfail;
576
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
if(params.data == NULL){
617
dhparamsfilename = NULL;
618
}
619
if(dhparamsfilename == NULL){
620
break;
621
}
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
629
}
630
free(params.data);
631
} while(false);
632
}
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
do {
639
int secfile = open(seckeyfilename, O_RDONLY);
640
if(secfile == -1){
641
perror_plus("open");
642
break;
643
}
644
size_t buffer_capacity = 0;
645
while(true){
646
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer.size,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
651
free(buffer.data);
652
buffer.data = NULL;
653
break;
654
}
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
657
BUFFER_SIZE);
658
/* EOF */
659
if(bytes_read == 0){
660
break;
661
}
662
/* check bytes_read for failure */
663
if(bytes_read < 0){
664
perror_plus("read");
665
free(buffer.data);
666
buffer.data = NULL;
667
break;
668
}
669
buffer.size += (unsigned int)bytes_read;
670
}
671
close(secfile);
672
} while(false);
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
676
{
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
" structure: %s",
682
safer_gnutls_strerror(ret));
683
free(buffer.data);
684
buffer.data = NULL;
685
} else {
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
691
privkey = NULL;
692
}
693
free(buffer.data);
694
buffer.data = NULL;
695
if(privkey != NULL){
696
/* Use private key to suggest an appropriate
697
sec_param */
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
700
if(debug){
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
704
(sec_param)));
705
}
706
}
707
}
708
}
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
if(debug){
713
fprintf_plus(stderr, "Falling back to security parameter"
714
" \"%s\"\n",
715
safe_string(gnutls_sec_param_get_name
716
(sec_param)));
717
}
718
}
719
}
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
if(uret != 0){
722
mc->dh_bits = uret;
723
if(debug){
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
mc->dh_bits);
729
}
730
} else {
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
734
(sec_param)),
735
safer_gnutls_strerror(ret));
736
goto globalfail;
737
}
738
} else if(debug){
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
mc->dh_bits);
741
}
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
747
goto globalfail;
748
}
749
}
750
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
535
751
536
752
return 0;
537
753
538
754
globalfail:
539
755
540
gnutls_certificate_free_credentials(mc.cred);
541
gnutls_global_deinit();
542
gnutls_dh_params_deinit(mc.dh_params);
756
gnutls_certificate_free_credentials(mc->cred);
757
gnutls_dh_params_deinit(mc->dh_params);
543
758
return -1;
544
759
}
545
760
546
static int init_gnutls_session(gnutls_session_t *session){
761
__attribute__((nonnull, warn_unused_result))
762
static int init_gnutls_session(gnutls_session_t *session,
763
mandos_context *mc){
547
764
int ret;
548
765
/* GnuTLS session creation */
549
766
do {
553
770
}
554
771
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
555
772
if(ret != GNUTLS_E_SUCCESS){
556
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
557
safer_gnutls_strerror(ret));
773
fprintf_plus(stderr,
774
"Error in GnuTLS session initialization: %s\n",
775
safer_gnutls_strerror(ret));
558
776
}
559
777
560
778
{
561
779
const char *err;
562
780
do {
563
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
781
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
564
782
if(quit_now){
565
783
gnutls_deinit(*session);
566
784
return -1;
567
785
}
568
786
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
569
787
if(ret != GNUTLS_E_SUCCESS){
570
fprintf(stderr, "Syntax error at: %s\n", err);
571
fprintf(stderr, "GnuTLS error: %s\n",
572
safer_gnutls_strerror(ret));
788
fprintf_plus(stderr, "Syntax error at: %s\n", err);
789
fprintf_plus(stderr, "GnuTLS error: %s\n",
790
safer_gnutls_strerror(ret));
573
791
gnutls_deinit(*session);
574
792
return -1;
575
793
}
577
795
578
796
do {
579
797
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
798
mc->cred);
581
799
if(quit_now){
582
800
gnutls_deinit(*session);
583
801
return -1;
584
802
}
585
803
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
804
if(ret != GNUTLS_E_SUCCESS){
587
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
805
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
806
safer_gnutls_strerror(ret));
589
807
gnutls_deinit(*session);
590
808
return -1;
591
809
}
593
811
/* ignore client certificate if any. */
594
812
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
595
813
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
597
598
814
return 0;
599
815
}
600
816
602
818
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
603
819
__attribute__((unused)) const char *txt){}
604
820
821
/* Set effective uid to 0, return errno */
822
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
826
if(seteuid(0) == -1){
827
ret = errno;
828
}
829
errno = old_errno;
830
return ret;
831
}
832
833
/* Set effective and real user ID to 0. Return errno. */
834
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
839
errno = old_errno;
840
return ret;
841
}
842
if(setuid(0) == -1){
843
ret = errno;
844
}
845
errno = old_errno;
846
return ret;
847
}
848
849
/* Set effective user ID to unprivileged saved user ID */
850
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
854
if(seteuid(uid) == -1){
855
ret = errno;
856
}
857
errno = old_errno;
858
return ret;
859
}
860
861
/* Lower privileges permanently */
862
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
866
if(setuid(uid) == -1){
867
ret = errno;
868
}
869
errno = old_errno;
870
return ret;
871
}
872
873
/* Helper function to add_local_route() and delete_local_route() */
874
__attribute__((nonnull, warn_unused_result))
875
static bool add_delete_local_route(const bool add,
876
const char *address,
877
AvahiIfIndex if_index){
878
int ret;
879
char helper[] = "mandos-client-iprouteadddel";
880
char add_arg[] = "add";
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
884
if(pluginhelperdir == NULL){
885
if(debug){
886
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
887
" variable not set; cannot run helper\n");
888
}
889
return false;
890
}
891
892
char interface[IF_NAMESIZE];
893
if(if_indextoname((unsigned int)if_index, interface) == NULL){
894
perror_plus("if_indextoname");
895
return false;
896
}
897
898
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
if(devnull == -1){
900
perror_plus("open(\"/dev/null\", O_RDONLY)");
901
return false;
902
}
903
pid_t pid = fork();
904
if(pid == 0){
905
/* Child */
906
/* Raise privileges */
907
errno = raise_privileges_permanently();
908
if(errno != 0){
909
perror_plus("Failed to raise privileges");
910
/* _exit(EX_NOPERM); */
911
} else {
912
/* Set group */
913
errno = 0;
914
ret = setgid(0);
915
if(ret == -1){
916
perror_plus("setgid");
917
_exit(EX_NOPERM);
918
}
919
/* Reset supplementary groups */
920
errno = 0;
921
ret = setgroups(0, NULL);
922
if(ret == -1){
923
perror_plus("setgroups");
924
_exit(EX_NOPERM);
925
}
926
}
927
ret = dup2(devnull, STDIN_FILENO);
928
if(ret == -1){
929
perror_plus("dup2(devnull, STDIN_FILENO)");
930
_exit(EX_OSERR);
931
}
932
ret = close(devnull);
933
if(ret == -1){
934
perror_plus("close");
935
_exit(EX_OSERR);
936
}
937
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
if(ret == -1){
939
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
_exit(EX_OSERR);
941
}
942
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
943
O_RDONLY
944
| O_DIRECTORY
945
| O_PATH
946
| O_CLOEXEC));
947
if(helperdir_fd == -1){
948
perror_plus("open");
949
_exit(EX_UNAVAILABLE);
950
}
951
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
helper, O_RDONLY));
953
if(helper_fd == -1){
954
perror_plus("openat");
955
close(helperdir_fd);
956
_exit(EX_UNAVAILABLE);
957
}
958
close(helperdir_fd);
959
#ifdef __GNUC__
960
#pragma GCC diagnostic push
961
#pragma GCC diagnostic ignored "-Wcast-qual"
962
#endif
963
if(fexecve(helper_fd, (char *const [])
964
{ helper, add ? add_arg : delete_arg, (char *)address,
965
interface, debug ? debug_flag : NULL, NULL },
966
environ) == -1){
967
#ifdef __GNUC__
968
#pragma GCC diagnostic pop
969
#endif
970
perror_plus("fexecve");
971
_exit(EXIT_FAILURE);
972
}
973
}
974
if(pid == -1){
975
perror_plus("fork");
976
return false;
977
}
978
int status;
979
pid_t pret = -1;
980
errno = 0;
981
do {
982
pret = waitpid(pid, &status, 0);
983
if(pret == -1 and errno == EINTR and quit_now){
984
int errno_raising = 0;
985
if((errno = raise_privileges()) != 0){
986
errno_raising = errno;
987
perror_plus("Failed to raise privileges in order to"
988
" kill helper program");
989
}
990
if(kill(pid, SIGTERM) == -1){
991
perror_plus("kill");
992
}
993
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
994
perror_plus("Failed to lower privileges after killing"
995
" helper program");
996
}
997
return false;
998
}
999
} while(pret == -1 and errno == EINTR);
1000
if(pret == -1){
1001
perror_plus("waitpid");
1002
return false;
1003
}
1004
if(WIFEXITED(status)){
1005
if(WEXITSTATUS(status) != 0){
1006
fprintf_plus(stderr, "Error: iprouteadddel exited"
1007
" with status %d\n", WEXITSTATUS(status));
1008
return false;
1009
}
1010
return true;
1011
}
1012
if(WIFSIGNALED(status)){
1013
fprintf_plus(stderr, "Error: iprouteadddel died by"
1014
" signal %d\n", WTERMSIG(status));
1015
return false;
1016
}
1017
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
return false;
1019
}
1020
1021
__attribute__((nonnull, warn_unused_result))
1022
static bool add_local_route(const char *address,
1023
AvahiIfIndex if_index){
1024
if(debug){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
}
1027
return add_delete_local_route(true, address, if_index);
1028
}
1029
1030
__attribute__((nonnull, warn_unused_result))
1031
static bool delete_local_route(const char *address,
1032
AvahiIfIndex if_index){
1033
if(debug){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
}
1036
return add_delete_local_route(false, address, if_index);
1037
}
1038
605
1039
/* Called when a Mandos server is found */
606
static int start_mandos_communication(const char *ip, uint16_t port,
1040
__attribute__((nonnull, warn_unused_result))
1041
static int start_mandos_communication(const char *ip, in_port_t port,
607
1042
AvahiIfIndex if_index,
608
int af){
1043
int af, mandos_context *mc){
609
1044
int ret, tcp_sd = -1;
610
1045
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
1046
struct sockaddr_storage to;
615
1047
char *buffer = NULL;
616
1048
char *decrypted_buffer = NULL;
617
1049
size_t buffer_length = 0;
620
1052
int retval = -1;
621
1053
gnutls_session_t session;
622
1054
int pf; /* Protocol family */
1055
bool route_added = false;
623
1056
624
1057
errno = 0;
625
1058
636
1069
pf = PF_INET;
637
1070
break;
638
1071
default:
639
fprintf(stderr, "Bad address family: %d\n", af);
1072
fprintf_plus(stderr, "Bad address family: %d\n", af);
640
1073
errno = EINVAL;
641
1074
return -1;
642
1075
}
643
1076
644
ret = init_gnutls_session(&session);
1077
/* If the interface is specified and we have a list of interfaces */
1078
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1079
/* Check if the interface is one of the interfaces we are using */
1080
bool match = false;
1081
{
1082
char *interface = NULL;
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
645
1111
if(ret != 0){
646
1112
return -1;
647
1113
}
648
1114
649
1115
if(debug){
650
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
652
1118
}
653
1119
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
655
1121
if(tcp_sd < 0){
656
1122
int e = errno;
657
1123
perror_plus("socket");
664
1130
goto mandos_end;
665
1131
}
666
1132
667
memset(&to, 0, sizeof(to));
668
1133
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
671
1137
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
674
1141
}
675
1142
if(ret < 0 ){
676
1143
int e = errno;
680
1147
}
681
1148
if(ret == 0){
682
1149
int e = errno;
683
fprintf(stderr, "Bad address: %s\n", ip);
1150
fprintf_plus(stderr, "Bad address: %s\n", ip);
684
1151
errno = e;
685
1152
goto mandos_end;
686
1153
}
687
1154
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
695
1158
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
" incomplete without a network interface\n");
698
1161
errno = EINVAL;
699
1162
goto mandos_end;
700
1163
}
701
1164
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
703
1166
}
704
1167
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
708
1169
}
709
1170
710
1171
if(quit_now){
718
1179
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
1180
perror_plus("if_indextoname");
720
1181
} else {
721
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
723
1184
}
724
1185
} else {
725
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
726
port);
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
727
1188
}
728
1189
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
729
1190
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
const char *pcret;
731
if(af == AF_INET6){
732
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
733
sizeof(addrstr));
734
} else {
735
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
736
sizeof(addrstr));
737
}
738
if(pcret == NULL){
739
perror_plus("inet_ntop");
740
} else {
741
if(strcmp(addrstr, ip) != 0){
742
fprintf(stderr, "Canonical address form: %s\n", addrstr);
743
}
744
}
745
}
746
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
if(af == AF_INET6){
753
ret = connect(tcp_sd, &to.in6, sizeof(to));
754
} else {
755
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
756
}
757
if(ret < 0){
758
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
759
int e = errno;
760
perror_plus("connect");
761
errno = e;
762
}
763
goto mandos_end;
764
}
765
766
if(quit_now){
767
errno = EINTR;
768
goto mandos_end;
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
769
1271
}
770
1272
771
1273
const char *out = mandos_protocol_version;
773
1275
while(true){
774
1276
size_t out_size = strlen(out);
775
1277
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
776
out_size - written));
1278
out_size - written));
777
1279
if(ret == -1){
778
1280
int e = errno;
779
1281
perror_plus("write");
799
1301
}
800
1302
801
1303
if(debug){
802
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1304
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
803
1305
}
804
1306
805
1307
if(quit_now){
807
1309
goto mandos_end;
808
1310
}
809
1311
810
/* Spurious warning from -Wint-to-pointer-cast */
811
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1312
/* This casting via intptr_t is to eliminate warning about casting
1313
an int to a pointer type. This is exactly how the GnuTLS Guile
1314
function "set-session-transport-fd!" does it. */
1315
gnutls_transport_set_ptr(session,
1316
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
812
1317
813
1318
if(quit_now){
814
1319
errno = EINTR;
825
1330
826
1331
if(ret != GNUTLS_E_SUCCESS){
827
1332
if(debug){
828
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1333
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
829
1334
gnutls_perror(ret);
830
1335
}
831
1336
errno = EPROTO;
835
1340
/* Read OpenPGP packet that contains the wanted password */
836
1341
837
1342
if(debug){
838
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
839
ip);
1343
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1344
" %s\n", ip);
840
1345
}
841
1346
842
1347
while(true){
847
1352
}
848
1353
849
1354
buffer_capacity = incbuffer(&buffer, buffer_length,
850
buffer_capacity);
1355
buffer_capacity);
851
1356
if(buffer_capacity == 0){
852
1357
int e = errno;
853
1358
perror_plus("incbuffer");
880
1385
}
881
1386
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
882
1387
if(ret < 0){
883
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1388
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1389
"***\n");
884
1390
gnutls_perror(ret);
885
1391
errno = EPROTO;
886
1392
goto mandos_end;
887
1393
}
888
1394
break;
889
1395
default:
890
fprintf(stderr, "Unknown error while reading data from"
891
" encrypted session with Mandos server\n");
1396
fprintf_plus(stderr, "Unknown error while reading data from"
1397
" encrypted session with Mandos server\n");
892
1398
gnutls_bye(session, GNUTLS_SHUT_RDWR);
893
1399
errno = EIO;
894
1400
goto mandos_end;
899
1405
}
900
1406
901
1407
if(debug){
902
fprintf(stderr, "Closing TLS session\n");
1408
fprintf_plus(stderr, "Closing TLS session\n");
903
1409
}
904
1410
905
1411
if(quit_now){
917
1423
918
1424
if(buffer_length > 0){
919
1425
ssize_t decrypted_buffer_size;
920
decrypted_buffer_size = pgp_packet_decrypt(buffer,
921
buffer_length,
922
&decrypted_buffer);
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
923
1428
if(decrypted_buffer_size >= 0){
924
1429
1430
clearerr(stdout);
925
1431
written = 0;
926
1432
while(written < (size_t) decrypted_buffer_size){
927
1433
if(quit_now){
935
1441
if(ret == 0 and ferror(stdout)){
936
1442
int e = errno;
937
1443
if(debug){
938
fprintf(stderr, "Error writing encrypted data: %s\n",
939
strerror(errno));
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
940
1446
}
941
1447
errno = e;
942
1448
goto mandos_end;
943
1449
}
944
1450
written += (size_t)ret;
945
1451
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
946
1462
retval = 0;
947
1463
}
948
1464
}
951
1467
952
1468
mandos_end:
953
1469
{
1470
if(route_added){
1471
if(not delete_local_route(ip, if_index)){
1472
fprintf_plus(stderr, "Failed to delete local route to %s on"
1473
" interface %d", ip, if_index);
1474
}
1475
}
954
1476
int e = errno;
955
1477
free(decrypted_buffer);
956
1478
free(buffer);
957
1479
if(tcp_sd >= 0){
958
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
ret = close(tcp_sd);
959
1481
}
960
1482
if(ret == -1){
961
1483
if(e == 0){
986
1508
AVAHI_GCC_UNUSED AvahiStringList *txt,
987
1509
AVAHI_GCC_UNUSED AvahiLookupResultFlags
988
1510
flags,
989
AVAHI_GCC_UNUSED void* userdata){
990
assert(r);
1511
void *mc){
1512
if(r == NULL){
1513
return;
1514
}
991
1515
992
1516
/* Called whenever a service has been resolved successfully or
993
1517
timed out */
994
1518
995
1519
if(quit_now){
1520
avahi_s_service_resolver_free(r);
996
1521
return;
997
1522
}
998
1523
999
1524
switch(event){
1000
1525
default:
1001
1526
case AVAHI_RESOLVER_FAILURE:
1002
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1003
" of type '%s' in domain '%s': %s\n", name, type, domain,
1004
avahi_strerror(avahi_server_errno(mc.server)));
1527
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1528
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1529
domain,
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
1005
1532
break;
1006
1533
1007
1534
case AVAHI_RESOLVER_FOUND:
1009
1536
char ip[AVAHI_ADDRESS_STR_MAX];
1010
1537
avahi_address_snprint(ip, sizeof(ip), address);
1011
1538
if(debug){
1012
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1013
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1014
ip, (intmax_t)interface, port);
1539
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1540
PRIdMAX ") on port %" PRIu16 "\n", name,
1541
host_name, ip, (intmax_t)interface, port);
1015
1542
}
1016
int ret = start_mandos_communication(ip, port, interface,
1017
avahi_proto_to_af(proto));
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
1018
1547
if(ret == 0){
1019
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(simple_poll);
1020
1549
} else {
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
1550
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1553
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1554
" list\n", name);
1555
}
1023
1556
}
1024
1557
}
1025
1558
}
1035
1568
const char *domain,
1036
1569
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1037
1570
flags,
1038
AVAHI_GCC_UNUSED void* userdata){
1039
assert(b);
1571
void *mc){
1572
if(b == NULL){
1573
return;
1574
}
1040
1575
1041
1576
/* Called whenever a new services becomes available on the LAN or
1042
1577
is removed from the LAN */
1049
1584
default:
1050
1585
case AVAHI_BROWSER_FAILURE:
1051
1586
1052
fprintf(stderr, "(Avahi browser) %s\n",
1053
avahi_strerror(avahi_server_errno(mc.server)));
1054
avahi_simple_poll_quit(mc.simple_poll);
1587
fprintf_plus(stderr, "(Avahi browser) %s\n",
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1590
avahi_simple_poll_quit(simple_poll);
1055
1591
return;
1056
1592
1057
1593
case AVAHI_BROWSER_NEW:
1060
1596
the callback function is called the Avahi server will free the
1061
1597
resolver for us. */
1062
1598
1063
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1064
name, type, domain, protocol, 0,
1065
resolve_callback, NULL) == NULL)
1066
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1067
name, avahi_strerror(avahi_server_errno(mc.server)));
1599
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1600
interface, protocol, name, type,
1601
domain, protocol, 0,
1602
resolve_callback, mc) == NULL)
1603
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1604
" %s\n", name,
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
1068
1607
break;
1069
1608
1070
1609
case AVAHI_BROWSER_REMOVE:
1073
1612
case AVAHI_BROWSER_ALL_FOR_NOW:
1074
1613
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1075
1614
if(debug){
1076
fprintf(stderr, "No Mandos server found, still searching...\n");
1615
fprintf_plus(stderr, "No Mandos server found, still"
1616
" searching...\n");
1077
1617
}
1078
1618
break;
1079
1619
}
1088
1628
signal_received = sig;
1089
1629
int old_errno = errno;
1090
1630
/* set main loop to exit */
1091
if(mc.simple_poll != NULL){
1092
avahi_simple_poll_quit(mc.simple_poll);
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1093
1633
}
1094
1634
errno = old_errno;
1095
1635
}
1096
1636
1637
__attribute__((nonnull, warn_unused_result))
1097
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1098
1639
int ret;
1640
int old_errno;
1099
1641
1100
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1101
1643
if(s < 0){
1644
old_errno = errno;
1102
1645
perror_plus("socket");
1646
errno = old_errno;
1103
1647
return false;
1104
1648
}
1105
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1106
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1107
1652
if(ret == -1){
1108
1653
if(debug){
1654
old_errno = errno;
1109
1655
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1110
1657
}
1111
1658
return false;
1112
1659
}
1113
1660
return true;
1114
1661
}
1115
1662
1663
__attribute__((nonnull, warn_unused_result))
1116
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1117
1665
1118
1666
/* Reject the loopback device */
1119
1667
if(ifr->ifr_flags & IFF_LOOPBACK){
1120
1668
if(debug){
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1669
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1670
ifname);
1123
1671
}
1124
1672
return false;
1125
1673
}
1126
1674
/* Accept point-to-point devices only if connect_to is specified */
1127
1675
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1128
1676
if(debug){
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1677
fprintf_plus(stderr, "Accepting point-to-point interface"
1678
" \"%s\"\n", ifname);
1131
1679
}
1132
1680
return true;
1133
1681
}
1134
1682
/* Otherwise, reject non-broadcast-capable devices */
1135
1683
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1136
1684
if(debug){
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1685
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1686
" \"%s\"\n", ifname);
1139
1687
}
1140
1688
return false;
1141
1689
}
1142
1690
/* Reject non-ARP interfaces (including dummy interfaces) */
1143
1691
if(ifr->ifr_flags & IFF_NOARP){
1144
1692
if(debug){
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1693
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1694
ifname);
1146
1695
}
1147
1696
return false;
1148
1697
}
1149
1698
1150
1699
/* Accept this device */
1151
1700
if(debug){
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1701
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1153
1702
}
1154
1703
return true;
1155
1704
}
1159
1708
* corresponds to an acceptable network device.
1160
1709
* (This function is passed to scandir(3) as a filter function.)
1161
1710
*/
1711
__attribute__((nonnull, warn_unused_result))
1162
1712
int good_interface(const struct dirent *if_entry){
1163
int ret;
1164
1713
if(if_entry->d_name[0] == '.'){
1165
1714
return 0;
1166
1715
}
1716
1167
1717
struct ifreq ifr;
1168
1169
1718
if(not get_flags(if_entry->d_name, &ifr)){
1719
if(debug){
1720
fprintf_plus(stderr, "Failed to get flags for interface "
1721
"\"%s\"\n", if_entry->d_name);
1722
}
1170
1723
return 0;
1171
1724
}
1172
1725
1177
1730
}
1178
1731
1179
1732
/*
1180
* This function determines if a directory entry in /sys/class/net
1181
* corresponds to an acceptable network device which is up.
1182
* (This function is passed to scandir(3) as a filter function.)
1183
*/
1184
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1256
}
1257
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1286
}
1287
return 1;
1288
}
1289
1733
* This function determines if a network interface is up.
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1737
struct ifreq ifr;
1738
if(not get_flags(interface, &ifr)){
1739
if(debug){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
}
1743
return false;
1744
}
1745
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1747
}
1748
1749
/*
1750
* This function determines if a network interface is running
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1754
struct ifreq ifr;
1755
if(not get_flags(interface, &ifr)){
1756
if(debug){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1759
}
1760
return false;
1761
}
1762
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
}
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1290
1767
int notdotentries(const struct dirent *direntry){
1291
1768
/* Skip "." and ".." */
1292
1769
if(direntry->d_name[0] == '.'
1299
1776
}
1300
1777
1301
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1302
1780
int runnable_hook(const struct dirent *direntry){
1303
1781
int ret;
1782
size_t sret;
1304
1783
struct stat st;
1305
1784
1306
1785
if((direntry->d_name)[0] == '\0'){
1308
1787
return 0;
1309
1788
}
1310
1789
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
"abcdefghijklmnopqrstuvwxyz"
1792
"0123456789"
1793
"_.-");
1794
if((direntry->d_name)[sret] != '\0'){
1795
/* Contains non-allowed characters */
1796
if(debug){
1797
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1798
direntry->d_name);
1799
}
1800
return 0;
1801
}
1802
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1328
1804
if(ret == -1){
1329
1805
if(debug){
1330
perror_plus("Could not stat plugin");
1806
perror_plus("Could not stat hook");
1331
1807
}
1332
1808
return 0;
1333
1809
}
1334
if(not (st.st_mode & S_ISREG)){
1810
if(not (S_ISREG(st.st_mode))){
1335
1811
/* Not a regular file */
1812
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1814
direntry->d_name);
1815
}
1336
1816
return 0;
1337
1817
}
1338
1818
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1339
1819
/* Not executable */
1820
if(debug){
1821
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1822
direntry->d_name);
1823
}
1340
1824
return 0;
1341
1825
}
1826
if(debug){
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1828
direntry->d_name);
1829
}
1342
1830
return 1;
1343
1831
}
1344
1832
1345
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1346
1836
int ret;
1347
1837
struct timespec now;
1348
1838
struct timespec waited_time;
1349
1839
intmax_t block_time;
1350
1840
1351
1841
while(true){
1352
if(mc.current_server == NULL){
1353
if (debug){
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1842
if(mc->current_server == NULL){
1843
if(debug){
1844
fprintf_plus(stderr, "Wait until first server is found."
1845
" No timeout!\n");
1356
1846
}
1357
1847
ret = avahi_simple_poll_iterate(s, -1);
1358
1848
} else {
1359
if (debug){
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1849
if(debug){
1850
fprintf_plus(stderr, "Check current_server if we should run"
1851
" it, or wait\n");
1362
1852
}
1363
1853
/* the current time */
1364
1854
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
1859
/* Calculating in ms how long time between now and server
1370
1860
who we visted longest time ago. Now - last seen. */
1371
1861
waited_time.tv_sec = (now.tv_sec
1372
- mc.current_server->last_seen.tv_sec);
1862
- mc->current_server->last_seen.tv_sec);
1373
1863
waited_time.tv_nsec = (now.tv_nsec
1374
- mc.current_server->last_seen.tv_nsec);
1864
- mc->current_server->last_seen.tv_nsec);
1375
1865
/* total time is 10s/10,000ms.
1376
1866
Converting to s from ms by dividing by 1,000,
1377
1867
and ns to ms by dividing by 1,000,000. */
1379
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1380
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1381
1871
1382
if (debug){
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1872
if(debug){
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
block_time);
1384
1875
}
1385
1876
1386
1877
if(block_time <= 0){
1387
ret = start_mandos_communication(mc.current_server->ip,
1388
mc.current_server->port,
1389
mc.current_server->if_index,
1390
mc.current_server->af);
1878
ret = start_mandos_communication(mc->current_server->ip,
1879
mc->current_server->port,
1880
mc->current_server->if_index,
1881
mc->current_server->af, mc);
1391
1882
if(ret == 0){
1392
avahi_simple_poll_quit(mc.simple_poll);
1883
avahi_simple_poll_quit(s);
1393
1884
return 0;
1394
1885
}
1395
1886
ret = clock_gettime(CLOCK_MONOTONIC,
1396
&mc.current_server->last_seen);
1887
&mc->current_server->last_seen);
1397
1888
if(ret == -1){
1398
1889
perror_plus("clock_gettime");
1399
1890
return -1;
1400
1891
}
1401
mc.current_server = mc.current_server->next;
1892
mc->current_server = mc->current_server->next;
1402
1893
block_time = 0; /* Call avahi to find new Mandos
1403
1894
servers, but don't block */
1404
1895
}
1406
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1407
1898
}
1408
1899
if(ret != 0){
1409
if (ret > 0 or errno != EINTR) {
1900
if(ret > 0 or errno != EINTR){
1410
1901
return (ret != 1) ? ret : 0;
1411
1902
}
1412
1903
}
1413
1904
}
1414
1905
}
1415
1906
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1909
const float delay){
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1928
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1991
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1996
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
2065
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
2085
}
2086
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2091
int ret;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2094
if(if_index == 0){
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
errno = old_errno;
2097
return ENXIO;
2098
}
2099
2100
if(quit_now){
2101
errno = old_errno;
2102
return EINTR;
2103
}
2104
2105
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2109
ret_errno = errno;
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
return ret_errno;
2114
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
2116
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
2119
ret_errno = errno;
2120
perror_plus("socket");
2121
errno = old_errno;
2122
return ret_errno;
2123
}
2124
2125
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
2130
errno = old_errno;
2131
return EINTR;
2132
}
2133
2134
if(debug){
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
interface);
2137
}
2138
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
2145
2146
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
2158
}
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2162
#ifdef __linux__
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2167
}
2168
}
2169
#endif /* __linux__ */
2170
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
2180
2181
/* Close the socket */
2182
ret = close(sd);
2183
if(ret == -1){
2184
perror_plus("close");
2185
}
2186
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
errno = old_errno;
2191
return ioctl_errno;
2192
}
2193
} else if(debug){
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
interface);
2196
}
2197
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2202
break;
2203
}
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2208
}
2209
}
2210
2211
errno = old_errno;
2212
return 0;
2213
}
2214
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2220
if(if_index == 0){
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
errno = old_errno;
2223
return ENXIO;
2224
}
2225
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2228
if(not get_flags(interface, &network) and debug){
2229
ret_errno = errno;
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2231
"\"%s\"\n", interface);
2232
errno = old_errno;
2233
return ret_errno;
2234
}
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
2239
ret_errno = errno;
2240
perror_plus("socket");
2241
errno = old_errno;
2242
return ret_errno;
2243
}
2244
2245
if(debug){
2246
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
interface);
2248
}
2249
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2252
if(ret_errno != 0){
2253
errno = ret_errno;
2254
perror_plus("Failed to raise privileges");
2255
}
2256
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2259
2260
/* If raise_privileges() succeeded above */
2261
if(ret_errno == 0){
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
2270
/* Close the socket */
2271
int ret = close(sd);
2272
if(ret == -1){
2273
perror_plus("close");
2274
}
2275
2276
if(ret_setflags == -1){
2277
errno = ioctl_errno;
2278
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
errno = old_errno;
2280
return ioctl_errno;
2281
}
2282
} else if(debug){
2283
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2284
interface);
2285
}
2286
2287
errno = old_errno;
2288
return 0;
2289
}
2290
1416
2291
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1417
2297
AvahiSServiceBrowser *sb = NULL;
1418
int error;
2298
error_t ret_errno;
1419
2299
int ret;
1420
2300
intmax_t tmpmax;
1421
2301
char *tmp;
1422
2302
int exitcode = EXIT_SUCCESS;
1423
const char *interface = "";
1424
struct ifreq network;
1425
int sd = -1;
1426
bool take_down_interface = false;
1427
uid_t uid;
1428
gid_t gid;
1429
char tempdir[] = "/tmp/mandosXXXXXX";
1430
bool tempdir_created = false;
2303
char *interfaces_to_take_down = NULL;
2304
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1431
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
2309
const char *seckey = PATHDIR "/" SECKEY;
1433
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
char *interfaces_hooks = NULL;
1434
2313
1435
2314
bool gnutls_initialized = false;
1436
2315
bool gpgme_initialized = false;
1488
2367
.doc = "Bit length of the prime number used in the"
1489
2368
" Diffie-Hellman key exchange",
1490
2369
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
1491
2375
{ .name = "priority", .key = 130,
1492
2376
.arg = "STRING",
1493
2377
.doc = "GnuTLS priority string for the TLS handshake",
1498
2382
.group = 2 },
1499
2383
{ .name = "retry", .key = 132,
1500
2384
.arg = "SECONDS",
1501
.doc = "Retry interval used when denied by the mandos server",
2385
.doc = "Retry interval used when denied by the Mandos server",
2386
.group = 2 },
2387
{ .name = "network-hook-dir", .key = 133,
2388
.arg = "DIR",
2389
.doc = "Directory where network hooks are located",
1502
2390
.group = 2 },
1503
2391
/*
1504
2392
* These reproduce what we would get without ARGP_NO_HELP
1523
2411
connect_to = arg;
1524
2412
break;
1525
2413
case 'i': /* --interface */
1526
interface = arg;
2414
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2415
arg, (int)',');
2416
if(ret_errno != 0){
2417
argp_error(state, "%s", strerror(ret_errno));
2418
}
1527
2419
break;
1528
2420
case 's': /* --seckey */
1529
2421
seckey = arg;
1540
2432
}
1541
2433
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1542
2434
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
1543
2438
case 130: /* --priority */
1544
2439
mc.priority = arg;
1545
2440
break;
1558
2453
argp_error(state, "Bad retry interval");
1559
2454
}
1560
2455
break;
2456
case 133: /* --network-hook-dir */
2457
hookdir = arg;
2458
break;
1561
2459
/*
1562
2460
* These reproduce what we would get without ARGP_NO_HELP
1563
2461
*/
1569
2467
argp_state_help(state, state->out_stream,
1570
2468
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1571
2469
case 'V': /* --version */
1572
fprintf(state->out_stream, "%s\n", argp_program_version);
2470
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1573
2471
exit(argp_err_exit_status);
1574
2472
break;
1575
2473
default:
1582
2480
.args_doc = "",
1583
2481
.doc = "Mandos client -- Get and decrypt"
1584
2482
" passwords from a Mandos server" };
1585
ret = argp_parse(&argp, argc, argv,
1586
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1587
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1588
2486
case 0:
1589
2487
break;
1590
2488
case ENOMEM:
1591
2489
default:
1592
errno = ret;
2490
errno = ret_errno;
1593
2491
perror_plus("argp_parse");
1594
2492
exitcode = EX_OSERR;
1595
2493
goto end;
1598
2496
goto end;
1599
2497
}
1600
2498
}
1601
2499
1602
2500
{
1603
2501
/* Work around Debian bug #633582:
1604
<http://bugs.debian.org/633582> */
1605
struct stat st;
1606
1607
/* Re-raise priviliges */
1608
errno = 0;
1609
ret = seteuid(0);
1610
if(ret == -1){
1611
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1659
}
1660
}
1661
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
2502
<https://bugs.debian.org/633582> */
2503
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
2509
} else {
2510
struct stat st;
2511
2512
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2513
int seckey_fd = open(seckey, O_RDONLY);
2514
if(seckey_fd == -1){
2515
perror_plus("open");
2516
} else {
2517
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2518
if(ret == -1){
2519
perror_plus("fstat");
2520
} else {
2521
if(S_ISREG(st.st_mode)
2522
and st.st_uid == 0 and st.st_gid == 0){
2523
ret = fchown(seckey_fd, uid, gid);
2524
if(ret == -1){
2525
perror_plus("fchown");
2526
}
2527
}
2528
}
2529
close(seckey_fd);
2530
}
2531
}
2532
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
int pubkey_fd = open(pubkey, O_RDONLY);
2535
if(pubkey_fd == -1){
2536
perror_plus("open");
2537
} else {
2538
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2539
if(ret == -1){
2540
perror_plus("fstat");
2541
} else {
2542
if(S_ISREG(st.st_mode)
2543
and st.st_uid == 0 and st.st_gid == 0){
2544
ret = fchown(pubkey_fd, uid, gid);
2545
if(ret == -1){
2546
perror_plus("fchown");
2547
}
2548
}
2549
}
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
2576
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
2581
}
2582
}
2583
}
2584
2585
/* Remove invalid interface names (except "none") */
2586
{
2587
char *interface = NULL;
2588
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2589
interface))){
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2593
fprintf_plus(stderr, "Not using nonexisting interface"
2594
" \"%s\"\n", interface);
2595
}
2596
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2597
interface = NULL;
2598
}
2599
}
2600
}
2601
2602
/* Run network hooks */
2603
{
2604
if(mc.interfaces != NULL){
2605
interfaces_hooks = malloc(mc.interfaces_size);
2606
if(interfaces_hooks == NULL){
2607
perror_plus("malloc");
1693
2608
goto end;
1694
2609
}
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1695
2612
}
1696
close(devnull);
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
1697
2615
}
1698
2616
1699
2617
if(not debug){
1700
2618
avahi_set_log_function(empty_log);
1701
2619
}
1702
2620
1703
if(interface[0] == '\0'){
1704
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1706
alphasort);
1707
if(ret >= 1){
1708
/* Pick the first good interface */
1709
interface = strdup(direntries[0]->d_name);
1710
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1712
}
1713
if(interface == NULL){
1714
perror_plus("malloc");
1715
free(direntries);
1716
exitcode = EXIT_FAILURE;
1717
goto end;
1718
}
1719
free(direntries);
1720
} else {
1721
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1723
exitcode = EXIT_FAILURE;
1724
goto end;
1725
}
1726
}
1727
1728
2621
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1729
2622
from the signal handler */
1730
2623
/* Initialize the pseudo-RNG for Avahi */
1731
2624
srand((unsigned int) time(NULL));
1732
mc.simple_poll = avahi_simple_poll_new();
1733
if(mc.simple_poll == NULL){
1734
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2625
simple_poll = avahi_simple_poll_new();
2626
if(simple_poll == NULL){
2627
fprintf_plus(stderr,
2628
"Avahi: Failed to create simple poll object.\n");
1735
2629
exitcode = EX_UNAVAILABLE;
1736
2630
goto end;
1737
2631
}
1799
2693
}
1800
2694
}
1801
2695
1802
/* If the interface is down, bring it up */
1803
if(strcmp(interface, "none") != 0){
1804
if_index = (AvahiIfIndex) if_nametoindex(interface);
1805
if(if_index == 0){
1806
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1807
exitcode = EX_UNAVAILABLE;
1808
goto end;
1809
}
1810
1811
if(quit_now){
1812
goto end;
1813
}
1814
1815
/* Re-raise priviliges */
1816
errno = 0;
1817
ret = seteuid(0);
1818
if(ret == -1){
1819
perror_plus("seteuid");
1820
}
1821
1822
#ifdef __linux__
1823
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1824
messages about the network interface to mess up the prompt */
1825
ret = klogctl(8, NULL, 5);
1826
bool restore_loglevel = true;
1827
if(ret == -1){
1828
restore_loglevel = false;
1829
perror_plus("klogctl");
1830
}
1831
#endif /* __linux__ */
1832
1833
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1834
if(sd < 0){
1835
perror_plus("socket");
1836
exitcode = EX_OSERR;
1837
#ifdef __linux__
1838
if(restore_loglevel){
1839
ret = klogctl(7, NULL, 0);
1840
if(ret == -1){
1841
perror_plus("klogctl");
1842
}
1843
}
1844
#endif /* __linux__ */
1845
/* Lower privileges */
1846
errno = 0;
1847
ret = seteuid(uid);
1848
if(ret == -1){
1849
perror_plus("seteuid");
1850
}
1851
goto end;
1852
}
1853
strcpy(network.ifr_name, interface);
1854
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1855
if(ret == -1){
1856
perror_plus("ioctl SIOCGIFFLAGS");
1857
#ifdef __linux__
1858
if(restore_loglevel){
1859
ret = klogctl(7, NULL, 0);
1860
if(ret == -1){
1861
perror_plus("klogctl");
1862
}
1863
}
1864
#endif /* __linux__ */
1865
exitcode = EX_OSERR;
1866
/* Lower privileges */
1867
errno = 0;
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
goto end;
1873
}
1874
if((network.ifr_flags & IFF_UP) == 0){
1875
network.ifr_flags |= IFF_UP;
1876
take_down_interface = true;
1877
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1878
if(ret == -1){
1879
take_down_interface = false;
1880
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1881
exitcode = EX_OSERR;
1882
#ifdef __linux__
1883
if(restore_loglevel){
1884
ret = klogctl(7, NULL, 0);
1885
if(ret == -1){
1886
perror_plus("klogctl");
2696
/* If no interfaces were specified, make a list */
2697
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2699
/* Look for any good interfaces */
2700
ret = scandir(sys_class_net, &direntries, good_interface,
2701
alphasort);
2702
if(ret >= 1){
2703
/* Add all found interfaces to interfaces list */
2704
for(int i = 0; i < ret; ++i){
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
direntries[i]->d_name);
2707
if(ret_errno != 0){
2708
errno = ret_errno;
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2711
continue;
2712
}
2713
if(debug){
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
direntries[i]->d_name);
2716
}
2717
free(direntries[i]);
2718
}
2719
free(direntries);
2720
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2724
fprintf_plus(stderr, "Could not find a network interface\n");
2725
exitcode = EXIT_FAILURE;
2726
goto end;
2727
}
2728
}
2729
2730
/* Bring up interfaces which are down, and remove any "none"s */
2731
{
2732
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2734
interface))){
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
2745
interface);
2746
interface = NULL;
1887
2747
}
1888
2748
}
1889
#endif /* __linux__ */
1890
/* Lower privileges */
1891
errno = 0;
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
goto end;
1897
}
1898
}
1899
/* Sleep checking until interface is running.
1900
Check every 0.25s, up to total time of delay */
1901
for(int i=0; i < delay * 4; i++){
1902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1903
if(ret == -1){
1904
perror_plus("ioctl SIOCGIFFLAGS");
1905
} else if(network.ifr_flags & IFF_RUNNING){
1906
2749
break;
1907
2750
}
1908
struct timespec sleeptime = { .tv_nsec = 250000000 };
1909
ret = nanosleep(&sleeptime, NULL);
1910
if(ret == -1 and errno != EINTR){
1911
perror_plus("nanosleep");
1912
}
1913
}
1914
if(not take_down_interface){
1915
/* We won't need the socket anymore */
1916
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1917
if(ret == -1){
1918
perror_plus("close");
1919
}
1920
}
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
/* Restores kernel loglevel to default */
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
if(take_down_interface){
1933
/* Lower privileges */
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
} else {
1939
/* Lower privileges permanently */
1940
ret = setuid(uid);
1941
if(ret == -1){
1942
perror_plus("setuid");
1943
}
1944
}
2751
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2753
if(not interface_was_up){
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2757
} else {
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2764
}
2765
}
2766
}
2767
if(debug and (interfaces_to_take_down == NULL)){
2768
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
}
2770
}
2771
2772
/* If we only got one interface, explicitly use only that one */
2773
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
if(debug){
2775
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2776
mc.interfaces);
2777
}
2778
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1945
2779
}
1946
2780
1947
2781
if(quit_now){
1948
2782
goto end;
1949
2783
}
1950
2784
1951
ret = init_gnutls_global(pubkey, seckey);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1952
2786
if(ret == -1){
1953
fprintf(stderr, "init_gnutls_global failed\n");
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
1954
2788
exitcode = EX_UNAVAILABLE;
1955
2789
goto end;
1956
2790
} else {
1961
2795
goto end;
1962
2796
}
1963
2797
1964
if(mkdtemp(tempdir) == NULL){
2798
/* Try /run/tmp before /tmp */
2799
tempdir = mkdtemp(run_tempdir);
2800
if(tempdir == NULL and errno == ENOENT){
2801
if(debug){
2802
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2803
run_tempdir, old_tempdir);
2804
}
2805
tempdir = mkdtemp(old_tempdir);
2806
}
2807
if(tempdir == NULL){
1965
2808
perror_plus("mkdtemp");
1966
2809
goto end;
1967
2810
}
1968
tempdir_created = true;
1969
2811
1970
2812
if(quit_now){
1971
2813
goto end;
1972
2814
}
1973
2815
1974
if(not init_gpgme(pubkey, seckey, tempdir)){
1975
fprintf(stderr, "init_gpgme failed\n");
2816
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2817
fprintf_plus(stderr, "init_gpgme failed\n");
1976
2818
exitcode = EX_UNAVAILABLE;
1977
2819
goto end;
1978
2820
} else {
1987
2829
/* Connect directly, do not use Zeroconf */
1988
2830
/* (Mainly meant for debugging) */
1989
2831
char *address = strrchr(connect_to, ':');
2832
1990
2833
if(address == NULL){
1991
fprintf(stderr, "No colon in address\n");
2834
fprintf_plus(stderr, "No colon in address\n");
1992
2835
exitcode = EX_USAGE;
1993
2836
goto end;
1994
2837
}
1997
2840
goto end;
1998
2841
}
1999
2842
2000
uint16_t port;
2843
in_port_t port;
2001
2844
errno = 0;
2002
2845
tmpmax = strtoimax(address+1, &tmp, 10);
2003
2846
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2004
or tmpmax != (uint16_t)tmpmax){
2005
fprintf(stderr, "Bad port number\n");
2847
or tmpmax != (in_port_t)tmpmax){
2848
fprintf_plus(stderr, "Bad port number\n");
2006
2849
exitcode = EX_USAGE;
2007
2850
goto end;
2008
2851
}
2009
2852
2010
2853
if(quit_now){
2011
2854
goto end;
2012
2855
}
2013
2856
2014
port = (uint16_t)tmpmax;
2857
port = (in_port_t)tmpmax;
2015
2858
*address = '\0';
2016
2859
/* Colon in address indicates IPv6 */
2017
2860
int af;
2033
2876
}
2034
2877
2035
2878
while(not quit_now){
2036
ret = start_mandos_communication(address, port, if_index, af);
2879
ret = start_mandos_communication(address, port, if_index, af,
2880
&mc);
2037
2881
if(quit_now or ret == 0){
2038
2882
break;
2039
2883
}
2040
2884
if(debug){
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2885
fprintf_plus(stderr, "Retrying in %d seconds\n",
2886
(int)retry_interval);
2043
2887
}
2044
sleep((int)retry_interval);
2888
sleep((unsigned int)retry_interval);
2045
2889
}
2046
2890
2047
if (not quit_now){
2891
if(not quit_now){
2048
2892
exitcode = EXIT_SUCCESS;
2049
2893
}
2050
2894
2065
2909
config.publish_domain = 0;
2066
2910
2067
2911
/* Allocate a new server */
2068
mc.server = avahi_server_new(avahi_simple_poll_get
2069
(mc.simple_poll), &config, NULL,
2070
NULL, &error);
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2071
2914
2072
2915
/* Free the Avahi configuration data */
2073
2916
avahi_server_config_free(&config);
2075
2918
2076
2919
/* Check if creating the Avahi server object succeeded */
2077
2920
if(mc.server == NULL){
2078
fprintf(stderr, "Failed to create Avahi server: %s\n",
2079
avahi_strerror(error));
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2080
2923
exitcode = EX_UNAVAILABLE;
2081
2924
goto end;
2082
2925
}
2088
2931
/* Create the Avahi service browser */
2089
2932
sb = avahi_s_service_browser_new(mc.server, if_index,
2090
2933
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2091
NULL, 0, browse_callback, NULL);
2934
NULL, 0, browse_callback,
2935
(void *)&mc);
2092
2936
if(sb == NULL){
2093
fprintf(stderr, "Failed to create service browser: %s\n",
2094
avahi_strerror(avahi_server_errno(mc.server)));
2937
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2938
avahi_strerror(avahi_server_errno(mc.server)));
2095
2939
exitcode = EX_UNAVAILABLE;
2096
2940
goto end;
2097
2941
}
2103
2947
/* Run the main loop */
2104
2948
2105
2949
if(debug){
2106
fprintf(stderr, "Starting Avahi loop search\n");
2950
fprintf_plus(stderr, "Starting Avahi loop search\n");
2107
2951
}
2108
2109
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
(int)(retry_interval * 1000));
2952
2953
ret = avahi_loop_with_timeout(simple_poll,
2954
(int)(retry_interval * 1000), &mc);
2111
2955
if(debug){
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2956
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2957
(ret == 0) ? "successfully" : "with error");
2114
2958
}
2115
2959
2116
2960
end:
2117
2961
2118
2962
if(debug){
2119
fprintf(stderr, "%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2120
2970
}
2121
2971
2122
2972
/* Cleanup things */
2973
free(mc.interfaces);
2974
2123
2975
if(sb != NULL)
2124
2976
avahi_s_service_browser_free(sb);
2125
2977
2126
2978
if(mc.server != NULL)
2127
2979
avahi_server_free(mc.server);
2128
2980
2129
if(mc.simple_poll != NULL)
2130
avahi_simple_poll_free(mc.simple_poll);
2981
if(simple_poll != NULL)
2982
avahi_simple_poll_free(simple_poll);
2131
2983
2132
2984
if(gnutls_initialized){
2133
2985
gnutls_certificate_free_credentials(mc.cred);
2134
gnutls_global_deinit();
2135
2986
gnutls_dh_params_deinit(mc.dh_params);
2136
2987
}
2137
2988
2138
2989
if(gpgme_initialized){
2139
2990
gpgme_release(mc.ctx);
2140
2991
}
2141
2992
2142
2993
/* Cleans up the circular linked list of Mandos servers the client
2143
2994
has seen */
2144
2995
if(mc.current_server != NULL){
2145
2996
mc.current_server->prev->next = NULL;
2146
2997
while(mc.current_server != NULL){
2147
2998
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
2148
3007
free(mc.current_server);
2149
3008
mc.current_server = next;
2150
3009
}
2151
3010
}
2152
3011
2153
/* XXX run network hooks "stop" here */
2154
2155
/* Take down the network interface */
2156
if(take_down_interface){
2157
/* Re-raise priviliges */
2158
errno = 0;
2159
ret = seteuid(0);
2160
if(ret == -1){
2161
perror_plus("seteuid");
2162
}
2163
if(geteuid() == 0){
2164
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
if(ret == -1){
2166
perror_plus("ioctl SIOCGIFFLAGS");
2167
} else if(network.ifr_flags & IFF_UP) {
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
if(ret == -1){
2171
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2172
}
2173
}
2174
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2175
if(ret == -1){
2176
perror_plus("close");
2177
}
2178
/* Lower privileges permanently */
2179
errno = 0;
2180
ret = setuid(uid);
2181
if(ret == -1){
2182
perror_plus("setuid");
2183
}
2184
}
3012
/* Re-raise privileges */
3013
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3017
perror_plus("Failed to raise privileges");
3018
} else {
3019
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3023
3024
/* Take down the network interfaces which were brought up */
3025
{
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3033
perror_plus("Failed to take down interface");
3034
}
3035
}
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3038
" down\n");
3039
}
3040
}
3041
}
3042
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
3047
}
3048
}
3049
3050
free(interfaces_to_take_down);
3051
free(interfaces_hooks);
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
2185
3107
}
2186
3108
2187
3109
/* Removes the GPGME temp directory and all files inside */
2188
if(tempdir_created){
2189
struct dirent **direntries = NULL;
2190
struct dirent *direntry = NULL;
2191
int numentries = scandir(tempdir, &direntries, notdotentries,
2192
alphasort);
2193
if (numentries > 0){
2194
for(int i = 0; i < numentries; i++){
2195
direntry = direntries[i];
2196
char *fullname = NULL;
2197
ret = asprintf(&fullname, "%s/%s", tempdir,
2198
direntry->d_name);
2199
if(ret < 0){
2200
perror_plus("asprintf");
2201
continue;
2202
}
2203
ret = remove(fullname);
2204
if(ret == -1){
2205
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2206
strerror(errno));
2207
}
2208
free(fullname);
2209
}
2210
}
2211
2212
/* need to clean even if 0 because man page doesn't specify */
2213
free(direntries);
2214
if (numentries == -1){
2215
perror_plus("scandir");
2216
}
2217
ret = rmdir(tempdir);
2218
if(ret == -1 and errno != ENOENT){
2219
perror_plus("rmdir");
2220
}
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2221
3112
}
2222
3113
2223
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0