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- Committer: teddy at bsnet
- Date: 2011-11-11 15:05:27 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111111150527-hdlgk1hkubtbth10
* plugins.d/mandos-client.c (good_interface): Add error message.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
- files removed:
- 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 © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 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
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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
87
80
argp_state, struct argp,
92
85
raise() */
93
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
87
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() */
104
88
105
89
#ifdef __linux__
106
90
#include <sys/klog.h> /* klogctl() */
124
108
init_gnutls_session(),
125
109
GNUTLS_* */
126
110
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
129
113
130
114
/* GPGME */
131
115
#include <gpgme.h> /* All GPGME types, constants and
147
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
132
static const char sys_class_net[] = "/sys/class/net";
149
133
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
134
155
135
/* Doubly linked list that need to be circularly linked when used */
156
136
typedef struct server{
157
137
const char *ip;
158
in_port_t port;
138
uint16_t port;
159
139
AvahiIfIndex if_index;
160
140
int af;
161
141
struct timespec last_seen;
165
145
166
146
/* Used for passing in values through the Avahi callback functions */
167
147
typedef struct {
148
AvahiSimplePoll *simple_poll;
168
149
AvahiServer *server;
169
150
gnutls_certificate_credentials_t cred;
170
151
unsigned int dh_bits;
172
153
const char *priority;
173
154
gpgme_ctx_t ctx;
174
155
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
156
} mandos_context;
178
157
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/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
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 };
181
163
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164
sig_atomic_t quit_now = 0;
183
165
int signal_received = 0;
184
166
185
167
/* Function to use when printing errors */
186
168
void perror_plus(const char *print_text){
187
int e = errno;
188
169
fprintf(stderr, "Mandos plugin %s: ",
189
170
program_invocation_short_name);
190
errno = e;
191
171
perror(print_text);
192
172
}
193
173
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
204
174
/*
205
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
176
* bytes. "buffer_capacity" is how much is currently allocated,
207
177
* "buffer_length" is how much is already used.
208
178
*/
209
__attribute__((nonnull, warn_unused_result))
210
179
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
180
size_t buffer_capacity){
212
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
219
184
return 0;
220
185
}
221
*buffer = new_buf;
222
186
buffer_capacity += BUFFER_SIZE;
223
187
}
224
188
return buffer_capacity;
225
189
}
226
190
227
191
/* Add server to set of servers to retry periodically */
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){
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
231
195
int ret;
232
196
server *new_server = malloc(sizeof(server));
233
197
if(new_server == NULL){
234
198
perror_plus("malloc");
235
return false;
199
return -1;
236
200
}
237
201
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
202
.port = port,
203
.if_index = if_index,
204
.af = af };
241
205
if(new_server->ip == NULL){
242
206
perror_plus("strdup");
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;
207
return -1;
259
208
}
260
209
/* Special case of first server */
261
if(*current_server == NULL){
210
if (mc.current_server == NULL){
262
211
new_server->next = new_server;
263
212
new_server->prev = new_server;
264
*current_server = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
265
215
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
269
218
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
273
227
}
274
228
275
229
/*
276
230
* Initialize GPGME.
277
231
*/
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){
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
283
234
gpgme_error_t rc;
284
235
gpgme_engine_info_t engine_info;
285
236
237
286
238
/*
287
239
* Helper function to insert pub and seckey to the engine keyring.
288
240
*/
289
bool import_key(const char * const filename){
241
bool import_key(const char *filename){
290
242
int ret;
291
243
int fd;
292
244
gpgme_data_t pgp_data;
299
251
300
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
253
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
304
256
return false;
305
257
}
306
258
307
rc = gpgme_op_import(mc->ctx, pgp_data);
259
rc = gpgme_op_import(mc.ctx, pgp_data);
308
260
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
311
263
return false;
312
264
}
313
265
314
ret = close(fd);
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
267
if(ret == -1){
316
268
perror_plus("close");
317
269
}
320
272
}
321
273
322
274
if(debug){
323
fprintf_plus(stderr, "Initializing GPGME\n");
275
fprintf(stderr, "Initializing GPGME\n");
324
276
}
325
277
326
278
/* Init GPGME */
327
279
gpgme_check_version(NULL);
328
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
329
281
if(rc != GPG_ERR_NO_ERROR){
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
332
284
return false;
333
285
}
334
286
335
287
/* Set GPGME home directory for the OpenPGP engine only */
336
288
rc = gpgme_get_engine_info(&engine_info);
337
289
if(rc != GPG_ERR_NO_ERROR){
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
340
292
return false;
341
293
}
342
294
while(engine_info != NULL){
348
300
engine_info = engine_info->next;
349
301
}
350
302
if(engine_info == NULL){
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
353
304
return false;
354
305
}
355
306
356
307
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
308
rc = gpgme_new(&(mc.ctx));
358
309
if(rc != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
362
312
return false;
363
313
}
364
314
373
323
* Decrypt OpenPGP data.
374
324
* Returns -1 on error
375
325
*/
376
__attribute__((nonnull, warn_unused_result))
377
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
327
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
328
char **plaintext){
381
329
gpgme_data_t dh_crypto, dh_plain;
382
330
gpgme_error_t rc;
383
331
ssize_t ret;
385
333
ssize_t plaintext_length = 0;
386
334
387
335
if(debug){
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
389
337
}
390
338
391
339
/* Create new GPGME data buffer from memory cryptotext */
392
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
393
341
0);
394
342
if(rc != GPG_ERR_NO_ERROR){
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
397
345
return -1;
398
346
}
399
347
400
348
/* Create new empty GPGME data buffer for the plaintext */
401
349
rc = gpgme_data_new(&dh_plain);
402
350
if(rc != GPG_ERR_NO_ERROR){
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
406
353
gpgme_data_release(dh_crypto);
407
354
return -1;
408
355
}
409
356
410
357
/* Decrypt data from the cryptotext data buffer to the plaintext
411
358
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
360
if(rc != GPG_ERR_NO_ERROR){
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
416
363
plaintext_length = -1;
417
364
if(debug){
418
365
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
366
result = gpgme_op_decrypt_result(mc.ctx);
420
367
if(result == NULL){
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
422
369
} else {
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);
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
427
374
if(result->file_name != NULL){
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
fprintf(stderr, "File name: %s\n", result->file_name);
429
376
}
430
377
gpgme_recipient_t recipient;
431
378
recipient = result->recipients;
432
379
while(recipient != NULL){
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");
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
440
386
recipient = recipient->next;
441
387
}
442
388
}
445
391
}
446
392
447
393
if(debug){
448
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
449
395
}
450
396
451
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
458
404
*plaintext = NULL;
459
405
while(true){
460
406
plaintext_capacity = incbuffer(plaintext,
461
(size_t)plaintext_length,
462
plaintext_capacity);
407
(size_t)plaintext_length,
408
plaintext_capacity);
463
409
if(plaintext_capacity == 0){
464
perror_plus("incbuffer");
465
plaintext_length = -1;
466
goto decrypt_end;
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
467
413
}
468
414
469
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
482
428
}
483
429
484
430
if(debug){
485
fprintf_plus(stderr, "Decrypted password is: ");
431
fprintf(stderr, "Decrypted password is: ");
486
432
for(ssize_t i = 0; i < plaintext_length; i++){
487
433
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
488
434
}
499
445
return plaintext_length;
500
446
}
501
447
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);
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
451
if(ret == NULL)
452
ret = "(unknown)";
453
return ret;
513
454
}
514
455
515
456
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
457
static void debuggnutls(__attribute__((unused)) int level,
518
458
const char* string){
519
fprintf_plus(stderr, "GnuTLS: %s", string);
459
fprintf(stderr, "GnuTLS: %s", string);
520
460
}
521
461
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
462
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
463
const char *seckeyfilename){
527
464
int ret;
528
unsigned int uret;
529
465
530
466
if(debug){
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
fprintf(stderr, "Initializing GnuTLS\n");
468
}
469
470
ret = gnutls_global_init();
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
474
return -1;
532
475
}
533
476
534
477
if(debug){
540
483
}
541
484
542
485
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
487
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_global_deinit();
547
491
return -1;
548
492
}
549
493
550
494
if(debug){
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
555
498
}
556
499
557
500
ret = gnutls_certificate_set_openpgp_key_file
558
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
559
502
GNUTLS_OPENPGP_FMT_BASE64);
560
503
if(ret != GNUTLS_E_SUCCESS){
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));
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
566
509
goto globalfail;
567
510
}
568
511
569
512
/* GnuTLS server initialization */
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);
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
517
goto globalfail;
518
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
523
goto globalfail;
524
}
525
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
751
527
752
528
return 0;
753
529
754
530
globalfail:
755
531
756
gnutls_certificate_free_credentials(mc->cred);
757
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_certificate_free_credentials(mc.cred);
533
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
758
535
return -1;
759
536
}
760
537
761
__attribute__((nonnull, warn_unused_result))
762
static int init_gnutls_session(gnutls_session_t *session,
763
mandos_context *mc){
538
static int init_gnutls_session(gnutls_session_t *session){
764
539
int ret;
765
540
/* GnuTLS session creation */
766
541
do {
770
545
}
771
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
772
547
if(ret != GNUTLS_E_SUCCESS){
773
fprintf_plus(stderr,
774
"Error in GnuTLS session initialization: %s\n",
775
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
776
550
}
777
551
778
552
{
779
553
const char *err;
780
554
do {
781
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
782
556
if(quit_now){
783
557
gnutls_deinit(*session);
784
558
return -1;
785
559
}
786
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
787
561
if(ret != GNUTLS_E_SUCCESS){
788
fprintf_plus(stderr, "Syntax error at: %s\n", err);
789
fprintf_plus(stderr, "GnuTLS error: %s\n",
790
safer_gnutls_strerror(ret));
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
791
565
gnutls_deinit(*session);
792
566
return -1;
793
567
}
795
569
796
570
do {
797
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
798
mc->cred);
572
mc.cred);
799
573
if(quit_now){
800
574
gnutls_deinit(*session);
801
575
return -1;
802
576
}
803
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
804
578
if(ret != GNUTLS_E_SUCCESS){
805
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
806
safer_gnutls_strerror(ret));
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
807
581
gnutls_deinit(*session);
808
582
return -1;
809
583
}
811
585
/* ignore client certificate if any. */
812
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
813
587
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
814
590
return 0;
815
591
}
816
592
818
594
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
819
595
__attribute__((unused)) const char *txt){}
820
596
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
1039
597
/* Called when a Mandos server is found */
1040
__attribute__((nonnull, warn_unused_result))
1041
static int start_mandos_communication(const char *ip, in_port_t port,
598
static int start_mandos_communication(const char *ip, uint16_t port,
1042
599
AvahiIfIndex if_index,
1043
int af, mandos_context *mc){
600
int af){
1044
601
int ret, tcp_sd = -1;
1045
602
ssize_t sret;
1046
struct sockaddr_storage to;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
1047
607
char *buffer = NULL;
1048
608
char *decrypted_buffer = NULL;
1049
609
size_t buffer_length = 0;
1052
612
int retval = -1;
1053
613
gnutls_session_t session;
1054
614
int pf; /* Protocol family */
1055
bool route_added = false;
1056
615
1057
616
errno = 0;
1058
617
1069
628
pf = PF_INET;
1070
629
break;
1071
630
default:
1072
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
fprintf(stderr, "Bad address family: %d\n", af);
1073
632
errno = EINVAL;
1074
633
return -1;
1075
634
}
1076
635
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);
636
ret = init_gnutls_session(&session);
1111
637
if(ret != 0){
1112
638
return -1;
1113
639
}
1114
640
1115
641
if(debug){
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
1118
644
}
1119
645
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
647
if(tcp_sd < 0){
1122
648
int e = errno;
1123
649
perror_plus("socket");
1130
656
goto mandos_end;
1131
657
}
1132
658
659
memset(&to, 0, sizeof(to));
1133
660
if(af == AF_INET6){
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);
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1137
663
} else { /* IPv4 */
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);
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
1141
666
}
1142
667
if(ret < 0 ){
1143
668
int e = errno;
1147
672
}
1148
673
if(ret == 0){
1149
674
int e = errno;
1150
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
fprintf(stderr, "Bad address: %s\n", ip);
1151
676
errno = e;
1152
677
goto mandos_end;
1153
678
}
1154
679
if(af == AF_INET6){
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
1158
687
if(if_index == AVAHI_IF_UNSPEC){
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
" incomplete without a network interface\n");
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
1161
690
errno = EINVAL;
1162
691
goto mandos_end;
1163
692
}
1164
693
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
695
}
1167
696
} else {
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
1169
700
}
1170
701
1171
702
if(quit_now){
1179
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1180
711
perror_plus("if_indextoname");
1181
712
} else {
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1184
715
}
1185
716
} else {
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
1188
719
}
1189
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
736
}
737
}
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
1271
761
}
1272
762
1273
763
const char *out = mandos_protocol_version;
1275
765
while(true){
1276
766
size_t out_size = strlen(out);
1277
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1278
out_size - written));
768
out_size - written));
1279
769
if(ret == -1){
1280
770
int e = errno;
1281
771
perror_plus("write");
1301
791
}
1302
792
1303
793
if(debug){
1304
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1305
795
}
1306
796
1307
797
if(quit_now){
1309
799
goto mandos_end;
1310
800
}
1311
801
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);
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1317
804
1318
805
if(quit_now){
1319
806
errno = EINTR;
1330
817
1331
818
if(ret != GNUTLS_E_SUCCESS){
1332
819
if(debug){
1333
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1334
821
gnutls_perror(ret);
1335
822
}
1336
823
errno = EPROTO;
1340
827
/* Read OpenPGP packet that contains the wanted password */
1341
828
1342
829
if(debug){
1343
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1344
" %s\n", ip);
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
1345
832
}
1346
833
1347
834
while(true){
1352
839
}
1353
840
1354
841
buffer_capacity = incbuffer(&buffer, buffer_length,
1355
buffer_capacity);
842
buffer_capacity);
1356
843
if(buffer_capacity == 0){
1357
844
int e = errno;
1358
845
perror_plus("incbuffer");
1385
872
}
1386
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1387
874
if(ret < 0){
1388
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1389
"***\n");
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1390
876
gnutls_perror(ret);
1391
877
errno = EPROTO;
1392
878
goto mandos_end;
1393
879
}
1394
880
break;
1395
881
default:
1396
fprintf_plus(stderr, "Unknown error while reading data from"
1397
" encrypted session with Mandos server\n");
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
1398
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1399
885
errno = EIO;
1400
886
goto mandos_end;
1405
891
}
1406
892
1407
893
if(debug){
1408
fprintf_plus(stderr, "Closing TLS session\n");
894
fprintf(stderr, "Closing TLS session\n");
1409
895
}
1410
896
1411
897
if(quit_now){
1423
909
1424
910
if(buffer_length > 0){
1425
911
ssize_t decrypted_buffer_size;
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1428
915
if(decrypted_buffer_size >= 0){
1429
916
1430
clearerr(stdout);
1431
917
written = 0;
1432
918
while(written < (size_t) decrypted_buffer_size){
1433
919
if(quit_now){
1441
927
if(ret == 0 and ferror(stdout)){
1442
928
int e = errno;
1443
929
if(debug){
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1446
932
}
1447
933
errno = e;
1448
934
goto mandos_end;
1449
935
}
1450
936
written += (size_t)ret;
1451
937
}
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
}
1462
938
retval = 0;
1463
939
}
1464
940
}
1467
943
1468
944
mandos_end:
1469
945
{
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
}
1476
946
int e = errno;
1477
947
free(decrypted_buffer);
1478
948
free(buffer);
1479
949
if(tcp_sd >= 0){
1480
ret = close(tcp_sd);
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
951
}
1482
952
if(ret == -1){
1483
953
if(e == 0){
1508
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
1509
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1510
980
flags,
1511
void *mc){
1512
if(r == NULL){
1513
return;
1514
}
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1515
983
1516
984
/* Called whenever a service has been resolved successfully or
1517
985
timed out */
1518
986
1519
987
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1521
988
return;
1522
989
}
1523
990
1524
991
switch(event){
1525
992
default:
1526
993
case AVAHI_RESOLVER_FAILURE:
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)));
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1532
997
break;
1533
998
1534
999
case AVAHI_RESOLVER_FOUND:
1536
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1537
1002
avahi_address_snprint(ip, sizeof(ip), address);
1538
1003
if(debug){
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);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1542
1007
}
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1547
1010
if(ret == 0){
1548
avahi_simple_poll_quit(simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1549
1012
} else {
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
}
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1556
1015
}
1557
1016
}
1558
1017
}
1568
1027
const char *domain,
1569
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1570
1029
flags,
1571
void *mc){
1572
if(b == NULL){
1573
return;
1574
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1575
1032
1576
1033
/* Called whenever a new services becomes available on the LAN or
1577
1034
is removed from the LAN */
1584
1041
default:
1585
1042
case AVAHI_BROWSER_FAILURE:
1586
1043
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);
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1591
1047
return;
1592
1048
1593
1049
case AVAHI_BROWSER_NEW:
1596
1052
the callback function is called the Avahi server will free the
1597
1053
resolver for us. */
1598
1054
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)));
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1607
1060
break;
1608
1061
1609
1062
case AVAHI_BROWSER_REMOVE:
1612
1065
case AVAHI_BROWSER_ALL_FOR_NOW:
1613
1066
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1614
1067
if(debug){
1615
fprintf_plus(stderr, "No Mandos server found, still"
1616
" searching...\n");
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1617
1069
}
1618
1070
break;
1619
1071
}
1628
1080
signal_received = sig;
1629
1081
int old_errno = errno;
1630
1082
/* set main loop to exit */
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1633
1085
}
1634
1086
errno = old_errno;
1635
1087
}
1636
1088
1637
__attribute__((nonnull, warn_unused_result))
1638
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1090
int ret;
1640
int old_errno;
1641
1091
1642
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1093
if(s < 0){
1644
old_errno = errno;
1645
1094
perror_plus("socket");
1646
errno = old_errno;
1647
1095
return false;
1648
1096
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1097
strcpy(ifr->ifr_name, ifname);
1651
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1099
if(ret == -1){
1653
1100
if(debug){
1654
old_errno = errno;
1655
1101
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1657
1102
}
1658
1103
return false;
1659
1104
}
1660
1105
return true;
1661
1106
}
1662
1107
1663
__attribute__((nonnull, warn_unused_result))
1664
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1665
1109
1666
1110
/* Reject the loopback device */
1667
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1668
1112
if(debug){
1669
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1670
ifname);
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1671
1115
}
1672
1116
return false;
1673
1117
}
1674
1118
/* Accept point-to-point devices only if connect_to is specified */
1675
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1676
1120
if(debug){
1677
fprintf_plus(stderr, "Accepting point-to-point interface"
1678
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1679
1123
}
1680
1124
return true;
1681
1125
}
1682
1126
/* Otherwise, reject non-broadcast-capable devices */
1683
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1684
1128
if(debug){
1685
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1686
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1687
1131
}
1688
1132
return false;
1689
1133
}
1690
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1691
1135
if(ifr->ifr_flags & IFF_NOARP){
1692
1136
if(debug){
1693
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1694
ifname);
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1695
1138
}
1696
1139
return false;
1697
1140
}
1698
1141
1699
1142
/* Accept this device */
1700
1143
if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1702
1145
}
1703
1146
return true;
1704
1147
}
1708
1151
* corresponds to an acceptable network device.
1709
1152
* (This function is passed to scandir(3) as a filter function.)
1710
1153
*/
1711
__attribute__((nonnull, warn_unused_result))
1712
1154
int good_interface(const struct dirent *if_entry){
1713
1155
if(if_entry->d_name[0] == '.'){
1714
1156
return 0;
1717
1159
struct ifreq ifr;
1718
1160
if(not get_flags(if_entry->d_name, &ifr)){
1719
1161
if(debug){
1720
fprintf_plus(stderr, "Failed to get flags for interface "
1721
"\"%s\"\n", if_entry->d_name);
1722
}
1723
return 0;
1724
}
1725
1726
if(not good_flags(if_entry->d_name, &ifr)){
1727
return 0;
1728
}
1729
return 1;
1730
}
1731
1732
/*
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))
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1767
1217
int notdotentries(const struct dirent *direntry){
1768
1218
/* Skip "." and ".." */
1769
1219
if(direntry->d_name[0] == '.'
1776
1226
}
1777
1227
1778
1228
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1780
1229
int runnable_hook(const struct dirent *direntry){
1781
1230
int ret;
1782
size_t sret;
1783
1231
struct stat st;
1784
1232
1785
1233
if((direntry->d_name)[0] == '\0'){
1787
1235
return 0;
1788
1236
}
1789
1237
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);
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1804
1255
if(ret == -1){
1805
1256
if(debug){
1806
perror_plus("Could not stat hook");
1257
perror_plus("Could not stat plugin");
1807
1258
}
1808
1259
return 0;
1809
1260
}
1810
1261
if(not (S_ISREG(st.st_mode))){
1811
1262
/* Not a regular file */
1812
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1814
direntry->d_name);
1815
}
1816
1263
return 0;
1817
1264
}
1818
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1819
1266
/* Not executable */
1820
if(debug){
1821
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1822
direntry->d_name);
1823
}
1824
1267
return 0;
1825
1268
}
1826
if(debug){
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1828
direntry->d_name);
1829
}
1830
1269
return 1;
1831
1270
}
1832
1271
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1836
1273
int ret;
1837
1274
struct timespec now;
1838
1275
struct timespec waited_time;
1839
1276
intmax_t block_time;
1840
1277
1841
1278
while(true){
1842
if(mc->current_server == NULL){
1843
if(debug){
1844
fprintf_plus(stderr, "Wait until first server is found."
1845
" No timeout!\n");
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1846
1283
}
1847
1284
ret = avahi_simple_poll_iterate(s, -1);
1848
1285
} else {
1849
if(debug){
1850
fprintf_plus(stderr, "Check current_server if we should run"
1851
" it, or wait\n");
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1852
1289
}
1853
1290
/* the current time */
1854
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1859
1296
/* Calculating in ms how long time between now and server
1860
1297
who we visted longest time ago. Now - last seen. */
1861
1298
waited_time.tv_sec = (now.tv_sec
1862
- mc->current_server->last_seen.tv_sec);
1299
- mc.current_server->last_seen.tv_sec);
1863
1300
waited_time.tv_nsec = (now.tv_nsec
1864
- mc->current_server->last_seen.tv_nsec);
1301
- mc.current_server->last_seen.tv_nsec);
1865
1302
/* total time is 10s/10,000ms.
1866
1303
Converting to s from ms by dividing by 1,000,
1867
1304
and ns to ms by dividing by 1,000,000. */
1869
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1870
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1871
1308
1872
if(debug){
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
block_time);
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1875
1311
}
1876
1312
1877
1313
if(block_time <= 0){
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);
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1882
1318
if(ret == 0){
1883
avahi_simple_poll_quit(s);
1319
avahi_simple_poll_quit(mc.simple_poll);
1884
1320
return 0;
1885
1321
}
1886
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1887
&mc->current_server->last_seen);
1323
&mc.current_server->last_seen);
1888
1324
if(ret == -1){
1889
1325
perror_plus("clock_gettime");
1890
1326
return -1;
1891
1327
}
1892
mc->current_server = mc->current_server->next;
1328
mc.current_server = mc.current_server->next;
1893
1329
block_time = 0; /* Call avahi to find new Mandos
1894
1330
servers, but don't block */
1895
1331
}
1897
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1898
1334
}
1899
1335
if(ret != 0){
1900
if(ret > 0 or errno != EINTR){
1336
if (ret > 0 or errno != EINTR) {
1901
1337
return (ret != 1) ? ret : 0;
1902
1338
}
1903
1339
}
1904
1340
}
1905
1341
}
1906
1342
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
2291
1343
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 };
2297
1344
AvahiSServiceBrowser *sb = NULL;
2298
error_t ret_errno;
1345
int error;
2299
1346
int ret;
2300
1347
intmax_t tmpmax;
2301
1348
char *tmp;
2302
1349
int exitcode = EXIT_SUCCESS;
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;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
2308
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2309
1359
const char *seckey = PATHDIR "/" SECKEY;
2310
1360
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
char *interfaces_hooks = NULL;
2313
1361
2314
1362
bool gnutls_initialized = false;
2315
1363
bool gpgme_initialized = false;
2367
1415
.doc = "Bit length of the prime number used in the"
2368
1416
" Diffie-Hellman key exchange",
2369
1417
.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 },
2375
1418
{ .name = "priority", .key = 130,
2376
1419
.arg = "STRING",
2377
1420
.doc = "GnuTLS priority string for the TLS handshake",
2382
1425
.group = 2 },
2383
1426
{ .name = "retry", .key = 132,
2384
1427
.arg = "SECONDS",
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",
1428
.doc = "Retry interval used when denied by the mandos server",
2390
1429
.group = 2 },
2391
1430
/*
2392
1431
* These reproduce what we would get without ARGP_NO_HELP
2411
1450
connect_to = arg;
2412
1451
break;
2413
1452
case 'i': /* --interface */
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
}
1453
interface = arg;
2419
1454
break;
2420
1455
case 's': /* --seckey */
2421
1456
seckey = arg;
2432
1467
}
2433
1468
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2434
1469
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2438
1470
case 130: /* --priority */
2439
1471
mc.priority = arg;
2440
1472
break;
2453
1485
argp_error(state, "Bad retry interval");
2454
1486
}
2455
1487
break;
2456
case 133: /* --network-hook-dir */
2457
hookdir = arg;
2458
break;
2459
1488
/*
2460
1489
* These reproduce what we would get without ARGP_NO_HELP
2461
1490
*/
2467
1496
argp_state_help(state, state->out_stream,
2468
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2469
1498
case 'V': /* --version */
2470
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
2471
1500
exit(argp_err_exit_status);
2472
1501
break;
2473
1502
default:
2480
1509
.args_doc = "",
2481
1510
.doc = "Mandos client -- Get and decrypt"
2482
1511
" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1512
ret = argp_parse(&argp, argc, argv,
1513
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1514
switch(ret){
2486
1515
case 0:
2487
1516
break;
2488
1517
case ENOMEM:
2489
1518
default:
2490
errno = ret_errno;
1519
errno = ret;
2491
1520
perror_plus("argp_parse");
2492
1521
exitcode = EX_OSERR;
2493
1522
goto end;
2496
1525
goto end;
2497
1526
}
2498
1527
}
2499
1528
2500
1529
{
2501
1530
/* Work around Debian bug #633582:
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");
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
setenv("DEVICE", interface, 1);
1612
setenv("VERBOSE", debug ? "1" : "0", 1);
1613
setenv("MODE", "start", 1);
1614
/* setenv( XXX more here */
1615
ret = execl(fullname, direntry->d_name, "start", NULL);
1616
perror_plus("execl");
1617
}
1618
free(fullname);
1619
if(quit_now){
2608
1620
goto end;
2609
1621
}
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
1622
}
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
1623
close(devnull);
2615
1624
}
2616
1625
2617
1626
if(not debug){
2618
1627
avahi_set_log_function(empty_log);
2619
1628
}
2620
1629
1630
if(interface[0] == '\0'){
1631
struct dirent **direntries;
1632
/* First look for interfaces that are up */
1633
ret = scandir(sys_class_net, &direntries, up_interface,
1634
alphasort);
1635
if(ret == 0){
1636
/* No up interfaces, look for any good interfaces */
1637
free(direntries);
1638
ret = scandir(sys_class_net, &direntries, good_interface,
1639
alphasort);
1640
}
1641
if(ret >= 1){
1642
/* Pick the first interface returned */
1643
interface = strdup(direntries[0]->d_name);
1644
if(debug){
1645
fprintf(stderr, "Using interface \"%s\"\n", interface);
1646
}
1647
if(interface == NULL){
1648
perror_plus("malloc");
1649
free(direntries);
1650
exitcode = EXIT_FAILURE;
1651
goto end;
1652
}
1653
free(direntries);
1654
} else {
1655
free(direntries);
1656
fprintf(stderr, "Could not find a network interface\n");
1657
exitcode = EXIT_FAILURE;
1658
goto end;
1659
}
1660
}
1661
2621
1662
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2622
1663
from the signal handler */
2623
1664
/* Initialize the pseudo-RNG for Avahi */
2624
1665
srand((unsigned int) time(NULL));
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");
1666
mc.simple_poll = avahi_simple_poll_new();
1667
if(mc.simple_poll == NULL){
1668
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2629
1669
exitcode = EX_UNAVAILABLE;
2630
1670
goto end;
2631
1671
}
2693
1733
}
2694
1734
}
2695
1735
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);
1736
/* If the interface is down, bring it up */
1737
if(strcmp(interface, "none") != 0){
1738
if_index = (AvahiIfIndex) if_nametoindex(interface);
1739
if(if_index == 0){
1740
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1741
exitcode = EX_UNAVAILABLE;
1742
goto end;
1743
}
1744
1745
if(quit_now){
1746
goto end;
1747
}
1748
1749
/* Re-raise priviliges */
1750
errno = 0;
1751
ret = seteuid(0);
1752
if(ret == -1){
1753
perror_plus("seteuid");
1754
}
1755
1756
#ifdef __linux__
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret = klogctl(8, NULL, 5);
1760
bool restore_loglevel = true;
1761
if(ret == -1){
1762
restore_loglevel = false;
1763
perror_plus("klogctl");
1764
}
1765
#endif /* __linux__ */
1766
1767
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1768
if(sd < 0){
1769
perror_plus("socket");
1770
exitcode = EX_OSERR;
1771
#ifdef __linux__
1772
if(restore_loglevel){
1773
ret = klogctl(7, NULL, 0);
1774
if(ret == -1){
1775
perror_plus("klogctl");
1776
}
1777
}
1778
#endif /* __linux__ */
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
goto end;
1786
}
1787
strcpy(network.ifr_name, interface);
1788
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1789
if(ret == -1){
1790
perror_plus("ioctl SIOCGIFFLAGS");
1791
#ifdef __linux__
1792
if(restore_loglevel){
1793
ret = klogctl(7, NULL, 0);
1794
if(ret == -1){
1795
perror_plus("klogctl");
1796
}
1797
}
1798
#endif /* __linux__ */
1799
exitcode = EX_OSERR;
1800
/* Lower privileges */
1801
errno = 0;
1802
ret = seteuid(uid);
1803
if(ret == -1){
1804
perror_plus("seteuid");
1805
}
1806
goto end;
1807
}
1808
if((network.ifr_flags & IFF_UP) == 0){
1809
network.ifr_flags |= IFF_UP;
1810
take_down_interface = true;
1811
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1812
if(ret == -1){
1813
take_down_interface = false;
1814
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1815
exitcode = EX_OSERR;
1816
#ifdef __linux__
1817
if(restore_loglevel){
1818
ret = klogctl(7, NULL, 0);
1819
if(ret == -1){
1820
perror_plus("klogctl");
1821
}
1822
}
1823
#endif /* __linux__ */
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
}
1833
/* Sleep checking until interface is running.
1834
Check every 0.25s, up to total time of delay */
1835
for(int i=0; i < delay * 4; i++){
1836
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1837
if(ret == -1){
1838
perror_plus("ioctl SIOCGIFFLAGS");
1839
} else if(network.ifr_flags & IFF_RUNNING){
1840
break;
1841
}
1842
struct timespec sleeptime = { .tv_nsec = 250000000 };
1843
ret = nanosleep(&sleeptime, NULL);
1844
if(ret == -1 and errno != EINTR){
1845
perror_plus("nanosleep");
1846
}
1847
}
1848
if(not take_down_interface){
1849
/* We won't need the socket anymore */
1850
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1851
if(ret == -1){
1852
perror_plus("close");
1853
}
1854
}
1855
#ifdef __linux__
1856
if(restore_loglevel){
1857
/* Restores kernel loglevel to default */
1858
ret = klogctl(7, NULL, 0);
1859
if(ret == -1){
1860
perror_plus("klogctl");
1861
}
1862
}
1863
#endif /* __linux__ */
1864
/* Lower privileges */
1865
errno = 0;
1866
if(take_down_interface){
1867
/* Lower privileges */
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
2720
1872
} 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;
2747
}
2748
}
2749
break;
2750
}
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);
1873
/* Lower privileges permanently */
1874
ret = setuid(uid);
1875
if(ret == -1){
1876
perror_plus("setuid");
1877
}
1878
}
2779
1879
}
2780
1880
2781
1881
if(quit_now){
2782
1882
goto end;
2783
1883
}
2784
1884
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1885
ret = init_gnutls_global(pubkey, seckey);
2786
1886
if(ret == -1){
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
1887
fprintf(stderr, "init_gnutls_global failed\n");
2788
1888
exitcode = EX_UNAVAILABLE;
2789
1889
goto end;
2790
1890
} else {
2795
1895
goto end;
2796
1896
}
2797
1897
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){
1898
if(mkdtemp(tempdir) == NULL){
2808
1899
perror_plus("mkdtemp");
2809
1900
goto end;
2810
1901
}
1902
tempdir_created = true;
2811
1903
2812
1904
if(quit_now){
2813
1905
goto end;
2814
1906
}
2815
1907
2816
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2817
fprintf_plus(stderr, "init_gpgme failed\n");
1908
if(not init_gpgme(pubkey, seckey, tempdir)){
1909
fprintf(stderr, "init_gpgme failed\n");
2818
1910
exitcode = EX_UNAVAILABLE;
2819
1911
goto end;
2820
1912
} else {
2829
1921
/* Connect directly, do not use Zeroconf */
2830
1922
/* (Mainly meant for debugging) */
2831
1923
char *address = strrchr(connect_to, ':');
2832
2833
1924
if(address == NULL){
2834
fprintf_plus(stderr, "No colon in address\n");
1925
fprintf(stderr, "No colon in address\n");
2835
1926
exitcode = EX_USAGE;
2836
1927
goto end;
2837
1928
}
2840
1931
goto end;
2841
1932
}
2842
1933
2843
in_port_t port;
1934
uint16_t port;
2844
1935
errno = 0;
2845
1936
tmpmax = strtoimax(address+1, &tmp, 10);
2846
1937
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2847
or tmpmax != (in_port_t)tmpmax){
2848
fprintf_plus(stderr, "Bad port number\n");
1938
or tmpmax != (uint16_t)tmpmax){
1939
fprintf(stderr, "Bad port number\n");
2849
1940
exitcode = EX_USAGE;
2850
1941
goto end;
2851
1942
}
2852
1943
2853
1944
if(quit_now){
2854
1945
goto end;
2855
1946
}
2856
1947
2857
port = (in_port_t)tmpmax;
1948
port = (uint16_t)tmpmax;
2858
1949
*address = '\0';
2859
1950
/* Colon in address indicates IPv6 */
2860
1951
int af;
2876
1967
}
2877
1968
2878
1969
while(not quit_now){
2879
ret = start_mandos_communication(address, port, if_index, af,
2880
&mc);
1970
ret = start_mandos_communication(address, port, if_index, af);
2881
1971
if(quit_now or ret == 0){
2882
1972
break;
2883
1973
}
2884
1974
if(debug){
2885
fprintf_plus(stderr, "Retrying in %d seconds\n",
2886
(int)retry_interval);
1975
fprintf(stderr, "Retrying in %d seconds\n",
1976
(int)retry_interval);
2887
1977
}
2888
sleep((unsigned int)retry_interval);
1978
sleep((int)retry_interval);
2889
1979
}
2890
1980
2891
if(not quit_now){
1981
if (not quit_now){
2892
1982
exitcode = EXIT_SUCCESS;
2893
1983
}
2894
1984
2909
1999
config.publish_domain = 0;
2910
2000
2911
2001
/* Allocate a new server */
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2002
mc.server = avahi_server_new(avahi_simple_poll_get
2003
(mc.simple_poll), &config, NULL,
2004
NULL, &error);
2914
2005
2915
2006
/* Free the Avahi configuration data */
2916
2007
avahi_server_config_free(&config);
2918
2009
2919
2010
/* Check if creating the Avahi server object succeeded */
2920
2011
if(mc.server == NULL){
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2012
fprintf(stderr, "Failed to create Avahi server: %s\n",
2013
avahi_strerror(error));
2923
2014
exitcode = EX_UNAVAILABLE;
2924
2015
goto end;
2925
2016
}
2931
2022
/* Create the Avahi service browser */
2932
2023
sb = avahi_s_service_browser_new(mc.server, if_index,
2933
2024
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2934
NULL, 0, browse_callback,
2935
(void *)&mc);
2025
NULL, 0, browse_callback, NULL);
2936
2026
if(sb == NULL){
2937
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2938
avahi_strerror(avahi_server_errno(mc.server)));
2027
fprintf(stderr, "Failed to create service browser: %s\n",
2028
avahi_strerror(avahi_server_errno(mc.server)));
2939
2029
exitcode = EX_UNAVAILABLE;
2940
2030
goto end;
2941
2031
}
2947
2037
/* Run the main loop */
2948
2038
2949
2039
if(debug){
2950
fprintf_plus(stderr, "Starting Avahi loop search\n");
2040
fprintf(stderr, "Starting Avahi loop search\n");
2951
2041
}
2952
2953
ret = avahi_loop_with_timeout(simple_poll,
2954
(int)(retry_interval * 1000), &mc);
2042
2043
ret = avahi_loop_with_timeout(mc.simple_poll,
2044
(int)(retry_interval * 1000));
2955
2045
if(debug){
2956
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2957
(ret == 0) ? "successfully" : "with error");
2046
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2047
(ret == 0) ? "successfully" : "with error");
2958
2048
}
2959
2049
2960
2050
end:
2961
2051
2962
2052
if(debug){
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
}
2053
fprintf(stderr, "%s exiting\n", argv[0]);
2970
2054
}
2971
2055
2972
2056
/* Cleanup things */
2973
free(mc.interfaces);
2974
2975
2057
if(sb != NULL)
2976
2058
avahi_s_service_browser_free(sb);
2977
2059
2978
2060
if(mc.server != NULL)
2979
2061
avahi_server_free(mc.server);
2980
2062
2981
if(simple_poll != NULL)
2982
avahi_simple_poll_free(simple_poll);
2063
if(mc.simple_poll != NULL)
2064
avahi_simple_poll_free(mc.simple_poll);
2983
2065
2984
2066
if(gnutls_initialized){
2985
2067
gnutls_certificate_free_credentials(mc.cred);
2068
gnutls_global_deinit();
2986
2069
gnutls_dh_params_deinit(mc.dh_params);
2987
2070
}
2988
2071
2989
2072
if(gpgme_initialized){
2990
2073
gpgme_release(mc.ctx);
2991
2074
}
2992
2075
2993
2076
/* Cleans up the circular linked list of Mandos servers the client
2994
2077
has seen */
2995
2078
if(mc.current_server != NULL){
2996
2079
mc.current_server->prev->next = NULL;
2997
2080
while(mc.current_server != NULL){
2998
2081
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
3007
2082
free(mc.current_server);
3008
2083
mc.current_server = next;
3009
2084
}
3010
2085
}
3011
2086
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
}
2087
/* XXX run network hooks "stop" here */
2088
2089
/* Take down the network interface */
2090
if(take_down_interface){
2091
/* Re-raise priviliges */
2092
errno = 0;
2093
ret = seteuid(0);
2094
if(ret == -1){
2095
perror_plus("seteuid");
3041
2096
}
3042
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
2097
if(geteuid() == 0){
2098
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2099
if(ret == -1){
2100
perror_plus("ioctl SIOCGIFFLAGS");
2101
} else if(network.ifr_flags & IFF_UP) {
2102
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2104
if(ret == -1){
2105
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2106
}
2107
}
2108
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2109
if(ret == -1){
2110
perror_plus("close");
2111
}
2112
/* Lower privileges permanently */
2113
errno = 0;
2114
ret = setuid(uid);
2115
if(ret == -1){
2116
perror_plus("setuid");
2117
}
3047
2118
}
3048
2119
}
3049
2120
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){
2121
/* Removes the GPGME temp directory and all files inside */
2122
if(tempdir_created){
3055
2123
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){
2124
struct dirent *direntry = NULL;
2125
int numentries = scandir(tempdir, &direntries, notdotentries,
2126
alphasort);
2127
if (numentries > 0){
3068
2128
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);
3107
}
3108
3109
/* Removes the GPGME temp directory and all files inside */
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2129
direntry = direntries[i];
2130
char *fullname = NULL;
2131
ret = asprintf(&fullname, "%s/%s", tempdir,
2132
direntry->d_name);
2133
if(ret < 0){
2134
perror_plus("asprintf");
2135
continue;
2136
}
2137
ret = remove(fullname);
2138
if(ret == -1){
2139
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2140
strerror(errno));
2141
}
2142
free(fullname);
2143
}
2144
}
2145
2146
/* need to clean even if 0 because man page doesn't specify */
2147
free(direntries);
2148
if (numentries == -1){
2149
perror_plus("scandir");
2150
}
2151
ret = rmdir(tempdir);
2152
if(ret == -1 and errno != ENOENT){
2153
perror_plus("rmdir");
2154
}
3112
2155
}
3113
2156
3114
2157
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0