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237.15.5
(compared to revision 237.7.493)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2011-11-14 18:32:54 UTC
- mfrom: (237.16.7 client-network-hooks)
- mto: (237.16.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: belorn@fukt.bsnet.se-20111114183254-ujkmu680jli1w3yd
merge
- files removed:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
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* "browse_callback", and parts of "main".
10
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*
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11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
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* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
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*
17
* Mandos is free software: you can redistribute it and/or modify it
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* 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
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#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
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41
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
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#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
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#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
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strtof(), abort() */
49
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#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
57
#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
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
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,
94
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
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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
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105
91
#ifdef __linux__
106
92
#include <sys/klog.h> /* klogctl() */
148
134
static const char sys_class_net[] = "/sys/class/net";
149
135
char *connect_to = NULL;
150
136
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
137
155
138
/* Doubly linked list that need to be circularly linked when used */
156
139
typedef struct server{
157
140
const char *ip;
158
in_port_t port;
141
uint16_t port;
159
142
AvahiIfIndex if_index;
160
143
int af;
161
144
struct timespec last_seen;
165
148
166
149
/* Used for passing in values through the Avahi callback functions */
167
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
168
152
AvahiServer *server;
169
153
gnutls_certificate_credentials_t cred;
170
154
unsigned int dh_bits;
172
156
const char *priority;
173
157
gpgme_ctx_t ctx;
174
158
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
159
} mandos_context;
178
160
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
181
166
182
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sig_atomic_t quit_now = 0;
183
168
int signal_received = 0;
184
169
185
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/* Function to use when printing errors */
186
171
void perror_plus(const char *print_text){
187
int e = errno;
188
172
fprintf(stderr, "Mandos plugin %s: ",
189
173
program_invocation_short_name);
190
errno = e;
191
174
perror(print_text);
192
175
}
193
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194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
177
int fprintf_plus(FILE *stream, const char *format, ...){
196
178
va_list ap;
197
179
va_start (ap, format);
198
180
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
183
}
203
184
204
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/*
206
187
* bytes. "buffer_capacity" is how much is currently allocated,
207
188
* "buffer_length" is how much is already used.
208
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*/
209
__attribute__((nonnull, warn_unused_result))
210
190
size_t incbuffer(char **buffer, size_t buffer_length,
211
191
size_t buffer_capacity){
212
192
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;
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
219
195
return 0;
220
196
}
221
*buffer = new_buf;
222
197
buffer_capacity += BUFFER_SIZE;
223
198
}
224
199
return buffer_capacity;
225
200
}
226
201
227
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/* 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){
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
231
205
int ret;
232
206
server *new_server = malloc(sizeof(server));
233
207
if(new_server == NULL){
234
208
perror_plus("malloc");
235
return false;
209
return -1;
236
210
}
237
211
*new_server = (server){ .ip = strdup(ip),
238
212
.port = port,
240
214
.af = af };
241
215
if(new_server->ip == NULL){
242
216
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;
217
return -1;
259
218
}
260
219
/* Special case of first server */
261
if(*current_server == NULL){
220
if (mc.current_server == NULL){
262
221
new_server->next = new_server;
263
222
new_server->prev = new_server;
264
*current_server = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
265
225
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
269
228
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
273
237
}
274
238
275
239
/*
276
240
* Initialize GPGME.
277
241
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
283
244
gpgme_error_t rc;
284
245
gpgme_engine_info_t engine_info;
285
246
247
286
248
/*
287
249
* Helper function to insert pub and seckey to the engine keyring.
288
250
*/
289
bool import_key(const char * const filename){
251
bool import_key(const char *filename){
290
252
int ret;
291
253
int fd;
292
254
gpgme_data_t pgp_data;
299
261
300
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
263
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));
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
304
267
return false;
305
268
}
306
269
307
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
308
271
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
311
275
return false;
312
276
}
313
277
314
ret = close(fd);
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
279
if(ret == -1){
316
280
perror_plus("close");
317
281
}
320
284
}
321
285
322
286
if(debug){
323
fprintf_plus(stderr, "Initializing GPGME\n");
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
324
289
}
325
290
326
291
/* Init GPGME */
327
292
gpgme_check_version(NULL);
328
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
329
294
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));
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
332
298
return false;
333
299
}
334
300
335
301
/* Set GPGME home directory for the OpenPGP engine only */
336
302
rc = gpgme_get_engine_info(&engine_info);
337
303
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));
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
340
307
return false;
341
308
}
342
309
while(engine_info != NULL){
348
315
engine_info = engine_info->next;
349
316
}
350
317
if(engine_info == NULL){
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", tempdir);
353
320
return false;
354
321
}
355
322
356
323
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
358
325
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));
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
362
329
return false;
363
330
}
364
331
373
340
* Decrypt OpenPGP data.
374
341
* Returns -1 on error
375
342
*/
376
__attribute__((nonnull, warn_unused_result))
377
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
344
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
345
char **plaintext){
381
346
gpgme_data_t dh_crypto, dh_plain;
382
347
gpgme_error_t rc;
383
348
ssize_t ret;
385
350
ssize_t plaintext_length = 0;
386
351
387
352
if(debug){
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
389
355
}
390
356
391
357
/* Create new GPGME data buffer from memory cryptotext */
392
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
393
359
0);
394
360
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));
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
397
364
return -1;
398
365
}
399
366
400
367
/* Create new empty GPGME data buffer for the plaintext */
401
368
rc = gpgme_data_new(&dh_plain);
402
369
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));
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
406
373
gpgme_data_release(dh_crypto);
407
374
return -1;
408
375
}
409
376
410
377
/* Decrypt data from the cryptotext data buffer to the plaintext
411
378
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
380
if(rc != GPG_ERR_NO_ERROR){
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
416
384
plaintext_length = -1;
417
385
if(debug){
418
386
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
387
result = gpgme_op_decrypt_result(mc.ctx);
420
388
if(result == NULL){
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
422
391
} else {
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
427
fprintf_plus(stderr, "Wrong key usage: %s\n",
428
result->wrong_key_usage ? "Yes" : "No");
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
397
result->wrong_key_usage);
429
398
if(result->file_name != NULL){
430
fprintf_plus(stderr, "File name: %s\n", result->file_name);
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
431
401
}
432
402
gpgme_recipient_t recipient;
433
403
recipient = result->recipients;
434
404
while(recipient != NULL){
435
fprintf_plus(stderr, "Public key algorithm: %s\n",
436
gpgme_pubkey_algo_name
437
(recipient->pubkey_algo));
438
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
439
fprintf_plus(stderr, "Secret key available: %s\n",
440
recipient->status == GPG_ERR_NO_SECKEY
441
? "No" : "Yes");
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
412
recipient->status == GPG_ERR_NO_SECKEY
413
? "No" : "Yes");
442
414
recipient = recipient->next;
443
415
}
444
416
}
447
419
}
448
420
449
421
if(debug){
450
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
451
424
}
452
425
453
426
/* Seek back to the beginning of the GPGME plaintext data buffer */
484
457
}
485
458
486
459
if(debug){
487
fprintf_plus(stderr, "Decrypted password is: ");
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
488
462
for(ssize_t i = 0; i < plaintext_length; i++){
489
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
490
464
}
501
475
return plaintext_length;
502
476
}
503
477
504
__attribute__((warn_unused_result, const))
505
static const char *safe_string(const char *str){
506
if(str == NULL)
507
return "(unknown)";
508
return str;
509
}
510
511
__attribute__((warn_unused_result))
512
static const char *safer_gnutls_strerror(int value){
513
const char *ret = gnutls_strerror(value);
514
return safe_string(ret);
478
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value); /* Spurious warning from
480
-Wunreachable-code */
481
if(ret == NULL)
482
ret = "(unknown)";
483
return ret;
515
484
}
516
485
517
486
/* GnuTLS log function callback */
518
__attribute__((nonnull))
519
487
static void debuggnutls(__attribute__((unused)) int level,
520
488
const char* string){
521
fprintf_plus(stderr, "GnuTLS: %s", string);
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
522
490
}
523
491
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
525
492
static int init_gnutls_global(const char *pubkeyfilename,
526
const char *seckeyfilename,
527
const char *dhparamsfilename,
528
mandos_context *mc){
493
const char *seckeyfilename){
529
494
int ret;
530
unsigned int uret;
531
495
532
496
if(debug){
533
fprintf_plus(stderr, "Initializing GnuTLS\n");
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
499
}
500
501
ret = gnutls_global_init();
502
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
505
return -1;
534
506
}
535
507
536
508
if(debug){
542
514
}
543
515
544
516
/* OpenPGP credentials */
545
ret = gnutls_certificate_allocate_credentials(&mc->cred);
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
546
518
if(ret != GNUTLS_E_SUCCESS){
547
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
521
gnutls_global_deinit();
549
522
return -1;
550
523
}
551
524
552
525
if(debug){
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
528
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
529
seckeyfilename);
557
530
}
558
531
559
532
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
533
(mc.cred, pubkeyfilename, seckeyfilename,
561
534
GNUTLS_OPENPGP_FMT_BASE64);
562
535
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
536
fprintf(stderr,
537
"Mandos plugin mandos-client: "
538
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
568
542
goto globalfail;
569
543
}
570
544
571
545
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
624
}
625
if(dhparamsfilename == NULL){
626
break;
627
}
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
635
}
636
free(params.data);
637
} while(false);
638
}
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
644
do {
645
int secfile = open(seckeyfilename, O_RDONLY);
646
if(secfile == -1){
647
perror_plus("open");
648
break;
649
}
650
size_t buffer_capacity = 0;
651
while(true){
652
buffer_capacity = incbuffer((char **)&buffer.data,
653
(size_t)buffer.size,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
657
free(buffer.data);
658
buffer.data = NULL;
659
break;
660
}
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
663
BUFFER_SIZE);
664
/* EOF */
665
if(bytes_read == 0){
666
break;
667
}
668
/* check bytes_read for failure */
669
if(bytes_read < 0){
670
perror_plus("read");
671
free(buffer.data);
672
buffer.data = NULL;
673
break;
674
}
675
buffer.size += (unsigned int)bytes_read;
676
}
677
close(secfile);
678
} while(false);
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
682
{
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
687
" structure: %s",
688
safer_gnutls_strerror(ret));
689
free(buffer.data);
690
buffer.data = NULL;
691
} else {
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
697
privkey = NULL;
698
}
699
free(buffer.data);
700
buffer.data = NULL;
701
if(privkey != NULL){
702
/* Use private key to suggest an appropriate
703
sec_param */
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
706
if(debug){
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
710
(sec_param)));
711
}
712
}
713
}
714
}
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
718
if(debug){
719
fprintf_plus(stderr, "Falling back to security parameter"
720
" \"%s\"\n",
721
safe_string(gnutls_sec_param_get_name
722
(sec_param)));
723
}
724
}
725
}
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
727
if(uret != 0){
728
mc->dh_bits = uret;
729
if(debug){
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
mc->dh_bits);
735
}
736
} else {
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
740
(sec_param)),
741
safer_gnutls_strerror(ret));
742
goto globalfail;
743
}
744
} else if(debug){
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
mc->dh_bits);
747
}
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
753
goto globalfail;
754
}
755
}
756
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
546
ret = gnutls_dh_params_init(&mc.dh_params);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
550
" %s\n", safer_gnutls_strerror(ret));
551
goto globalfail;
552
}
553
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
554
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
557
safer_gnutls_strerror(ret));
558
goto globalfail;
559
}
560
561
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
757
562
758
563
return 0;
759
564
760
565
globalfail:
761
566
762
gnutls_certificate_free_credentials(mc->cred);
763
gnutls_dh_params_deinit(mc->dh_params);
567
gnutls_certificate_free_credentials(mc.cred);
568
gnutls_global_deinit();
569
gnutls_dh_params_deinit(mc.dh_params);
764
570
return -1;
765
571
}
766
572
767
__attribute__((nonnull, warn_unused_result))
768
static int init_gnutls_session(gnutls_session_t *session,
769
mandos_context *mc){
573
static int init_gnutls_session(gnutls_session_t *session){
770
574
int ret;
771
575
/* GnuTLS session creation */
772
576
do {
776
580
}
777
581
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
778
582
if(ret != GNUTLS_E_SUCCESS){
779
fprintf_plus(stderr,
780
"Error in GnuTLS session initialization: %s\n",
781
safer_gnutls_strerror(ret));
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
585
safer_gnutls_strerror(ret));
782
586
}
783
587
784
588
{
785
589
const char *err;
786
590
do {
787
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
788
592
if(quit_now){
789
593
gnutls_deinit(*session);
790
594
return -1;
791
595
}
792
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
793
597
if(ret != GNUTLS_E_SUCCESS){
794
fprintf_plus(stderr, "Syntax error at: %s\n", err);
795
fprintf_plus(stderr, "GnuTLS error: %s\n",
796
safer_gnutls_strerror(ret));
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
797
602
gnutls_deinit(*session);
798
603
return -1;
799
604
}
801
606
802
607
do {
803
608
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
804
mc->cred);
609
mc.cred);
805
610
if(quit_now){
806
611
gnutls_deinit(*session);
807
612
return -1;
808
613
}
809
614
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
810
615
if(ret != GNUTLS_E_SUCCESS){
811
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
812
safer_gnutls_strerror(ret));
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
618
safer_gnutls_strerror(ret));
813
619
gnutls_deinit(*session);
814
620
return -1;
815
621
}
817
623
/* ignore client certificate if any. */
818
624
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
819
625
626
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
627
820
628
return 0;
821
629
}
822
630
824
632
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
825
633
__attribute__((unused)) const char *txt){}
826
634
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
832
if(seteuid(0) == -1){
833
ret = errno;
834
}
835
errno = old_errno;
836
return ret;
837
}
838
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
if(ret != 0){
845
errno = old_errno;
846
return ret;
847
}
848
if(setuid(0) == -1){
849
ret = errno;
850
}
851
errno = old_errno;
852
return ret;
853
}
854
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
860
if(seteuid(uid) == -1){
861
ret = errno;
862
}
863
errno = old_errno;
864
return ret;
865
}
866
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
872
if(setuid(uid) == -1){
873
ret = errno;
874
}
875
errno = old_errno;
876
return ret;
877
}
878
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
882
const char *address,
883
AvahiIfIndex if_index){
884
int ret;
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
891
if(debug){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
894
}
895
return false;
896
}
897
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
901
return false;
902
}
903
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
905
if(devnull == -1){
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
return false;
908
}
909
pid_t pid = fork();
910
if(pid == 0){
911
/* Child */
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
914
if(errno != 0){
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
917
} else {
918
/* Set group */
919
errno = 0;
920
ret = setgid(0);
921
if(ret == -1){
922
perror_plus("setgid");
923
_exit(EX_NOPERM);
924
}
925
/* Reset supplementary groups */
926
errno = 0;
927
ret = setgroups(0, NULL);
928
if(ret == -1){
929
perror_plus("setgroups");
930
_exit(EX_NOPERM);
931
}
932
}
933
ret = dup2(devnull, STDIN_FILENO);
934
if(ret == -1){
935
perror_plus("dup2(devnull, STDIN_FILENO)");
936
_exit(EX_OSERR);
937
}
938
ret = close(devnull);
939
if(ret == -1){
940
perror_plus("close");
941
_exit(EX_OSERR);
942
}
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
944
if(ret == -1){
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
_exit(EX_OSERR);
947
}
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
O_RDONLY
950
| O_DIRECTORY
951
| O_PATH
952
| O_CLOEXEC));
953
if(helperdir_fd == -1){
954
perror_plus("open");
955
_exit(EX_UNAVAILABLE);
956
}
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
helper, O_RDONLY));
959
if(helper_fd == -1){
960
perror_plus("openat");
961
close(helperdir_fd);
962
_exit(EX_UNAVAILABLE);
963
}
964
close(helperdir_fd);
965
#ifdef __GNUC__
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
968
#endif
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
972
environ) == -1){
973
#ifdef __GNUC__
974
#pragma GCC diagnostic pop
975
#endif
976
perror_plus("fexecve");
977
_exit(EXIT_FAILURE);
978
}
979
}
980
if(pid == -1){
981
perror_plus("fork");
982
return false;
983
}
984
int status;
985
pid_t pret = -1;
986
errno = 0;
987
do {
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
995
}
996
if(kill(pid, SIGTERM) == -1){
997
perror_plus("kill");
998
}
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1001
" helper program");
1002
}
1003
return false;
1004
}
1005
} while(pret == -1 and errno == EINTR);
1006
if(pret == -1){
1007
perror_plus("waitpid");
1008
return false;
1009
}
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1014
return false;
1015
}
1016
return true;
1017
}
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1021
return false;
1022
}
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1024
return false;
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1032
}
1033
return add_delete_local_route(true, address, if_index);
1034
}
1035
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1039
if(debug){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1041
}
1042
return add_delete_local_route(false, address, if_index);
1043
}
1044
1045
635
/* Called when a Mandos server is found */
1046
__attribute__((nonnull, warn_unused_result))
1047
static int start_mandos_communication(const char *ip, in_port_t port,
636
static int start_mandos_communication(const char *ip, uint16_t port,
1048
637
AvahiIfIndex if_index,
1049
int af, mandos_context *mc){
638
int af){
1050
639
int ret, tcp_sd = -1;
1051
640
ssize_t sret;
1052
struct sockaddr_storage to;
641
union {
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
644
} to;
1053
645
char *buffer = NULL;
1054
646
char *decrypted_buffer = NULL;
1055
647
size_t buffer_length = 0;
1058
650
int retval = -1;
1059
651
gnutls_session_t session;
1060
652
int pf; /* Protocol family */
1061
bool route_added = false;
1062
653
1063
654
errno = 0;
1064
655
1075
666
pf = PF_INET;
1076
667
break;
1077
668
default:
1078
fprintf_plus(stderr, "Bad address family: %d\n", af);
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
1079
671
errno = EINVAL;
1080
672
return -1;
1081
673
}
1082
674
1083
/* If the interface is specified and we have a list of interfaces */
1084
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1085
/* Check if the interface is one of the interfaces we are using */
1086
bool match = false;
1087
{
1088
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
1092
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
match = true;
1094
break;
1095
}
1096
}
1097
}
1098
if(not match){
1099
/* This interface does not match any in the list, so we don't
1100
connect to the server */
1101
if(debug){
1102
char interface[IF_NAMESIZE];
1103
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1104
perror_plus("if_indextoname");
1105
} else {
1106
fprintf_plus(stderr, "Skipping server on non-used interface"
1107
" \"%s\"\n",
1108
if_indextoname((unsigned int)if_index,
1109
interface));
1110
}
1111
}
1112
return -1;
1113
}
1114
}
1115
1116
ret = init_gnutls_session(&session, mc);
675
ret = init_gnutls_session(&session);
1117
676
if(ret != 0){
1118
677
return -1;
1119
678
}
1120
679
1121
680
if(debug){
1122
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1123
PRIuMAX "\n", ip, (uintmax_t)port);
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
683
"\n", ip, port);
1124
684
}
1125
685
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
686
tcp_sd = socket(pf, SOCK_STREAM, 0);
1127
687
if(tcp_sd < 0){
1128
688
int e = errno;
1129
689
perror_plus("socket");
1136
696
goto mandos_end;
1137
697
}
1138
698
699
memset(&to, 0, sizeof(to));
1139
700
if(af == AF_INET6){
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
701
to.in6.sin6_family = (sa_family_t)af;
702
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1143
703
} else { /* IPv4 */
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
704
to.in.sin_family = (sa_family_t)af;
705
ret = inet_pton(af, ip, &to.in.sin_addr);
1147
706
}
1148
707
if(ret < 0 ){
1149
708
int e = errno;
1153
712
}
1154
713
if(ret == 0){
1155
714
int e = errno;
1156
fprintf_plus(stderr, "Bad address: %s\n", ip);
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
1157
717
errno = e;
1158
718
goto mandos_end;
1159
719
}
1160
720
if(af == AF_INET6){
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
721
to.in6.sin6_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
724
725
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
727
-Wunreachable-code*/
1164
728
if(if_index == AVAHI_IF_UNSPEC){
1165
fprintf_plus(stderr, "An IPv6 link-local address is"
1166
" incomplete without a network interface\n");
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
731
" without a network interface\n");
1167
732
errno = EINVAL;
1168
733
goto mandos_end;
1169
734
}
1170
735
/* Set the network interface number as scope */
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
736
to.in6.sin6_scope_id = (uint32_t)if_index;
1172
737
}
1173
738
} else {
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
739
to.in.sin_port = htons(port); /* Spurious warnings from
740
-Wconversion and
741
-Wunreachable-code */
1175
742
}
1176
743
1177
744
if(quit_now){
1185
752
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1186
753
perror_plus("if_indextoname");
1187
754
} else {
1188
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1189
"\n", ip, interface, (uintmax_t)port);
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
757
ip, interface, port);
1190
758
}
1191
759
} else {
1192
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1193
ip, (uintmax_t)port);
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1194
762
}
1195
763
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1196
764
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1197
if(af == AF_INET6){
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in6),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
} else {
1203
ret = getnameinfo((struct sockaddr *)&to,
1204
sizeof(struct sockaddr_in),
1205
addrstr, sizeof(addrstr), NULL, 0,
1206
NI_NUMERICHOST);
1207
}
1208
if(ret == EAI_SYSTEM){
1209
perror_plus("getnameinfo");
1210
} else if(ret != 0) {
1211
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1212
} else if(strcmp(addrstr, ip) != 0){
1213
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
}
1215
}
1216
1217
if(quit_now){
1218
errno = EINTR;
1219
goto mandos_end;
1220
}
1221
1222
while(true){
1223
if(af == AF_INET6){
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1226
} else {
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1229
}
1230
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1237
&to)->sin6_addr)))
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1248
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1252
*/
1253
if(debug){
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1255
" direct route\n");
1256
}
1257
int e = errno;
1258
route_added = add_local_route(ip, if_index);
1259
if(route_added){
1260
continue;
1261
}
1262
errno = e;
1263
}
1264
if(errno != ECONNREFUSED or debug){
1265
int e = errno;
1266
perror_plus("connect");
1267
errno = e;
1268
}
1269
goto mandos_end;
1270
}
1271
1272
if(quit_now){
1273
errno = EINTR;
1274
goto mandos_end;
1275
}
1276
break;
765
const char *pcret;
766
if(af == AF_INET6){
767
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
768
sizeof(addrstr));
769
} else {
770
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
771
sizeof(addrstr));
772
}
773
if(pcret == NULL){
774
perror_plus("inet_ntop");
775
} else {
776
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
779
}
780
}
781
}
782
783
if(quit_now){
784
errno = EINTR;
785
goto mandos_end;
786
}
787
788
if(af == AF_INET6){
789
ret = connect(tcp_sd, &to.in6, sizeof(to));
790
} else {
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
792
}
793
if(ret < 0){
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
795
int e = errno;
796
perror_plus("connect");
797
errno = e;
798
}
799
goto mandos_end;
800
}
801
802
if(quit_now){
803
errno = EINTR;
804
goto mandos_end;
1277
805
}
1278
806
1279
807
const char *out = mandos_protocol_version;
1307
835
}
1308
836
1309
837
if(debug){
1310
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
1311
840
}
1312
841
1313
842
if(quit_now){
1315
844
goto mandos_end;
1316
845
}
1317
846
1318
/* This casting via intptr_t is to eliminate warning about casting
1319
an int to a pointer type. This is exactly how the GnuTLS Guile
1320
function "set-session-transport-fd!" does it. */
1321
gnutls_transport_set_ptr(session,
1322
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
847
/* Spurious warning from -Wint-to-pointer-cast */
848
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1323
849
1324
850
if(quit_now){
1325
851
errno = EINTR;
1336
862
1337
863
if(ret != GNUTLS_E_SUCCESS){
1338
864
if(debug){
1339
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
1340
867
gnutls_perror(ret);
1341
868
}
1342
869
errno = EPROTO;
1346
873
/* Read OpenPGP packet that contains the wanted password */
1347
874
1348
875
if(debug){
1349
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1350
" %s\n", ip);
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
1351
878
}
1352
879
1353
880
while(true){
1391
918
}
1392
919
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1393
920
if(ret < 0){
1394
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1395
"***\n");
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
1396
923
gnutls_perror(ret);
1397
924
errno = EPROTO;
1398
925
goto mandos_end;
1399
926
}
1400
927
break;
1401
928
default:
1402
fprintf_plus(stderr, "Unknown error while reading data from"
1403
" encrypted session with Mandos server\n");
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
931
" encrypted session with Mandos server\n");
1404
932
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1405
933
errno = EIO;
1406
934
goto mandos_end;
1411
939
}
1412
940
1413
941
if(debug){
1414
fprintf_plus(stderr, "Closing TLS session\n");
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
1415
944
}
1416
945
1417
946
if(quit_now){
1430
959
if(buffer_length > 0){
1431
960
ssize_t decrypted_buffer_size;
1432
961
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1433
&decrypted_buffer, mc);
962
&decrypted_buffer);
1434
963
if(decrypted_buffer_size >= 0){
1435
964
1436
clearerr(stdout);
1437
965
written = 0;
1438
966
while(written < (size_t) decrypted_buffer_size){
1439
967
if(quit_now){
1447
975
if(ret == 0 and ferror(stdout)){
1448
976
int e = errno;
1449
977
if(debug){
1450
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1451
strerror(errno));
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
980
strerror(errno));
1452
981
}
1453
982
errno = e;
1454
983
goto mandos_end;
1455
984
}
1456
985
written += (size_t)ret;
1457
986
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
1468
987
retval = 0;
1469
988
}
1470
989
}
1473
992
1474
993
mandos_end:
1475
994
{
1476
if(route_added){
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1479
" interface %d", ip, if_index);
1480
}
1481
}
1482
995
int e = errno;
1483
996
free(decrypted_buffer);
1484
997
free(buffer);
1485
998
if(tcp_sd >= 0){
1486
ret = close(tcp_sd);
999
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1487
1000
}
1488
1001
if(ret == -1){
1489
1002
if(e == 0){
1514
1027
AVAHI_GCC_UNUSED AvahiStringList *txt,
1515
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1516
1029
flags,
1517
void *mc){
1518
if(r == NULL){
1519
return;
1520
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(r);
1521
1032
1522
1033
/* Called whenever a service has been resolved successfully or
1523
1034
timed out */
1524
1035
1525
1036
if(quit_now){
1526
avahi_s_service_resolver_free(r);
1527
1037
return;
1528
1038
}
1529
1039
1530
1040
switch(event){
1531
1041
default:
1532
1042
case AVAHI_RESOLVER_FAILURE:
1533
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1534
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1535
domain,
1536
avahi_strerror(avahi_server_errno
1537
(((mandos_context*)mc)->server)));
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
1045
" of type '%s' in domain '%s': %s\n", name, type, domain,
1046
avahi_strerror(avahi_server_errno(mc.server)));
1538
1047
break;
1539
1048
1540
1049
case AVAHI_RESOLVER_FOUND:
1542
1051
char ip[AVAHI_ADDRESS_STR_MAX];
1543
1052
avahi_address_snprint(ip, sizeof(ip), address);
1544
1053
if(debug){
1545
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1546
PRIdMAX ") on port %" PRIu16 "\n", name,
1547
host_name, ip, (intmax_t)interface, port);
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
1056
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
ip, (intmax_t)interface, port);
1548
1058
}
1549
int ret = start_mandos_communication(ip, (in_port_t)port,
1550
interface,
1551
avahi_proto_to_af(proto),
1552
mc);
1059
int ret = start_mandos_communication(ip, port, interface,
1060
avahi_proto_to_af(proto));
1553
1061
if(ret == 0){
1554
avahi_simple_poll_quit(simple_poll);
1062
avahi_simple_poll_quit(mc.simple_poll);
1555
1063
} else {
1556
if(not add_server(ip, (in_port_t)port, interface,
1557
avahi_proto_to_af(proto),
1558
&((mandos_context*)mc)->current_server)){
1559
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1560
" list\n", name);
1561
}
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1562
1066
}
1563
1067
}
1564
1068
}
1574
1078
const char *domain,
1575
1079
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1576
1080
flags,
1577
void *mc){
1578
if(b == NULL){
1579
return;
1580
}
1081
AVAHI_GCC_UNUSED void* userdata){
1082
assert(b);
1581
1083
1582
1084
/* Called whenever a new services becomes available on the LAN or
1583
1085
is removed from the LAN */
1590
1092
default:
1591
1093
case AVAHI_BROWSER_FAILURE:
1592
1094
1593
fprintf_plus(stderr, "(Avahi browser) %s\n",
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
1596
avahi_simple_poll_quit(simple_poll);
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
1097
avahi_strerror(avahi_server_errno(mc.server)));
1098
avahi_simple_poll_quit(mc.simple_poll);
1597
1099
return;
1598
1100
1599
1101
case AVAHI_BROWSER_NEW:
1602
1104
the callback function is called the Avahi server will free the
1603
1105
resolver for us. */
1604
1106
1605
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1606
interface, protocol, name, type,
1607
domain, protocol, 0,
1608
resolve_callback, mc) == NULL)
1609
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1610
" %s\n", name,
1611
avahi_strerror(avahi_server_errno
1612
(((mandos_context*)mc)->server)));
1107
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1108
name, type, domain, protocol, 0,
1109
resolve_callback, NULL) == NULL)
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
1112
name, avahi_strerror(avahi_server_errno(mc.server)));
1613
1113
break;
1614
1114
1615
1115
case AVAHI_BROWSER_REMOVE:
1618
1118
case AVAHI_BROWSER_ALL_FOR_NOW:
1619
1119
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1620
1120
if(debug){
1621
fprintf_plus(stderr, "No Mandos server found, still"
1622
" searching...\n");
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
1623
1123
}
1624
1124
break;
1625
1125
}
1634
1134
signal_received = sig;
1635
1135
int old_errno = errno;
1636
1136
/* set main loop to exit */
1637
if(simple_poll != NULL){
1638
avahi_simple_poll_quit(simple_poll);
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1639
1139
}
1640
1140
errno = old_errno;
1641
1141
}
1642
1142
1643
__attribute__((nonnull, warn_unused_result))
1644
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1645
1144
int ret;
1646
int old_errno;
1647
1145
1648
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1649
1147
if(s < 0){
1650
old_errno = errno;
1651
1148
perror_plus("socket");
1652
errno = old_errno;
1653
1149
return false;
1654
1150
}
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1151
strcpy(ifr->ifr_name, ifname);
1657
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1658
1153
if(ret == -1){
1659
1154
if(debug){
1660
old_errno = errno;
1661
1155
perror_plus("ioctl SIOCGIFFLAGS");
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1668
1156
}
1669
1157
return false;
1670
1158
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1676
1159
return true;
1677
1160
}
1678
1161
1679
__attribute__((nonnull, warn_unused_result))
1680
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1681
1163
1682
1164
/* Reject the loopback device */
1683
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1684
1166
if(debug){
1685
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1686
ifname);
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1687
1169
}
1688
1170
return false;
1689
1171
}
1690
1172
/* Accept point-to-point devices only if connect_to is specified */
1691
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1692
1174
if(debug){
1693
fprintf_plus(stderr, "Accepting point-to-point interface"
1694
" \"%s\"\n", ifname);
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1695
1177
}
1696
1178
return true;
1697
1179
}
1698
1180
/* Otherwise, reject non-broadcast-capable devices */
1699
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1700
1182
if(debug){
1701
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1702
" \"%s\"\n", ifname);
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1703
1185
}
1704
1186
return false;
1705
1187
}
1706
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1707
1189
if(ifr->ifr_flags & IFF_NOARP){
1708
1190
if(debug){
1709
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1710
ifname);
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1711
1193
}
1712
1194
return false;
1713
1195
}
1714
1196
1715
1197
/* Accept this device */
1716
1198
if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1718
1201
}
1719
1202
return true;
1720
1203
}
1724
1207
* corresponds to an acceptable network device.
1725
1208
* (This function is passed to scandir(3) as a filter function.)
1726
1209
*/
1727
__attribute__((nonnull, warn_unused_result))
1728
1210
int good_interface(const struct dirent *if_entry){
1729
1211
if(if_entry->d_name[0] == '.'){
1730
1212
return 0;
1733
1215
struct ifreq ifr;
1734
1216
if(not get_flags(if_entry->d_name, &ifr)){
1735
1217
if(debug){
1736
fprintf_plus(stderr, "Failed to get flags for interface "
1737
"\"%s\"\n", if_entry->d_name);
1738
}
1739
return 0;
1740
}
1741
1742
if(not good_flags(if_entry->d_name, &ifr)){
1743
return 0;
1744
}
1745
return 1;
1746
}
1747
1748
/*
1749
* This function determines if a network interface is up.
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_up(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_UP);
1763
}
1764
1765
/*
1766
* This function determines if a network interface is running
1767
*/
1768
__attribute__((nonnull, warn_unused_result))
1769
bool interface_is_running(const char *interface){
1770
struct ifreq ifr;
1771
if(not get_flags(interface, &ifr)){
1772
if(debug){
1773
fprintf_plus(stderr, "Failed to get flags for interface "
1774
"\"%s\"\n", interface);
1775
}
1776
return false;
1777
}
1778
1779
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1780
}
1781
1782
__attribute__((nonnull, pure, warn_unused_result))
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1783
1277
int notdotentries(const struct dirent *direntry){
1784
1278
/* Skip "." and ".." */
1785
1279
if(direntry->d_name[0] == '.'
1792
1286
}
1793
1287
1794
1288
/* Is this directory entry a runnable program? */
1795
__attribute__((nonnull, warn_unused_result))
1796
1289
int runnable_hook(const struct dirent *direntry){
1797
1290
int ret;
1798
1291
size_t sret;
1806
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1807
1300
"abcdefghijklmnopqrstuvwxyz"
1808
1301
"0123456789"
1809
"_.-");
1302
"_-");
1810
1303
if((direntry->d_name)[sret] != '\0'){
1811
1304
/* Contains non-allowed characters */
1812
1305
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1814
direntry->d_name);
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1815
1309
}
1816
1310
return 0;
1817
1311
}
1818
1312
1819
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1315
if(ret < 0){
1316
perror_plus("asprintf");
1317
return 0;
1318
}
1319
1320
ret = stat(fullname, &st);
1820
1321
if(ret == -1){
1821
1322
if(debug){
1822
1323
perror_plus("Could not stat hook");
1826
1327
if(not (S_ISREG(st.st_mode))){
1827
1328
/* Not a regular file */
1828
1329
if(debug){
1829
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1830
direntry->d_name);
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1831
1333
}
1832
1334
return 0;
1833
1335
}
1834
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1835
1337
/* Not executable */
1836
1338
if(debug){
1837
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1838
direntry->d_name);
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1839
1342
}
1840
1343
return 0;
1841
1344
}
1842
if(debug){
1843
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1844
direntry->d_name);
1845
}
1846
1345
return 1;
1847
1346
}
1848
1347
1849
__attribute__((nonnull, warn_unused_result))
1850
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1851
mandos_context *mc){
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1852
1349
int ret;
1853
1350
struct timespec now;
1854
1351
struct timespec waited_time;
1855
1352
intmax_t block_time;
1856
1353
1857
1354
while(true){
1858
if(mc->current_server == NULL){
1859
if(debug){
1860
fprintf_plus(stderr, "Wait until first server is found."
1861
" No timeout!\n");
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1862
1359
}
1863
1360
ret = avahi_simple_poll_iterate(s, -1);
1864
1361
} else {
1865
if(debug){
1866
fprintf_plus(stderr, "Check current_server if we should run"
1867
" it, or wait\n");
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1868
1366
}
1869
1367
/* the current time */
1870
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1875
1373
/* Calculating in ms how long time between now and server
1876
1374
who we visted longest time ago. Now - last seen. */
1877
1375
waited_time.tv_sec = (now.tv_sec
1878
- mc->current_server->last_seen.tv_sec);
1376
- mc.current_server->last_seen.tv_sec);
1879
1377
waited_time.tv_nsec = (now.tv_nsec
1880
- mc->current_server->last_seen.tv_nsec);
1378
- mc.current_server->last_seen.tv_nsec);
1881
1379
/* total time is 10s/10,000ms.
1882
1380
Converting to s from ms by dividing by 1,000,
1883
1381
and ns to ms by dividing by 1,000,000. */
1885
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1886
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1887
1385
1888
if(debug){
1889
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1890
block_time);
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1891
1389
}
1892
1390
1893
1391
if(block_time <= 0){
1894
ret = start_mandos_communication(mc->current_server->ip,
1895
mc->current_server->port,
1896
mc->current_server->if_index,
1897
mc->current_server->af, mc);
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1898
1396
if(ret == 0){
1899
avahi_simple_poll_quit(s);
1397
avahi_simple_poll_quit(mc.simple_poll);
1900
1398
return 0;
1901
1399
}
1902
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1903
&mc->current_server->last_seen);
1401
&mc.current_server->last_seen);
1904
1402
if(ret == -1){
1905
1403
perror_plus("clock_gettime");
1906
1404
return -1;
1907
1405
}
1908
mc->current_server = mc->current_server->next;
1406
mc.current_server = mc.current_server->next;
1909
1407
block_time = 0; /* Call avahi to find new Mandos
1910
1408
servers, but don't block */
1911
1409
}
1913
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1914
1412
}
1915
1413
if(ret != 0){
1916
if(ret > 0 or errno != EINTR){
1414
if (ret > 0 or errno != EINTR){
1917
1415
return (ret != 1) ? ret : 0;
1918
1416
}
1919
1417
}
1920
1418
}
1921
1419
}
1922
1420
1923
__attribute__((nonnull))
1924
void run_network_hooks(const char *mode, const char *interface,
1925
const float delay){
1926
struct dirent **direntries = NULL;
1927
if(hookdir_fd == -1){
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1929
| O_CLOEXEC);
1930
if(hookdir_fd == -1){
1931
if(errno == ENOENT){
1932
if(debug){
1933
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1934
" found\n", hookdir);
1935
}
1936
} else {
1937
perror_plus("open");
1938
}
1939
return;
1940
}
1941
}
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
runnable_hook, alphasort);
1949
if(numhooks == -1){
1950
perror_plus("scandir");
1951
close(devnull);
1952
return;
1953
}
1954
struct dirent *direntry;
1955
int ret;
1956
for(int i = 0; i < numhooks; i++){
1957
direntry = direntries[i];
1958
if(debug){
1959
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1960
direntry->d_name);
1961
}
1962
pid_t hook_pid = fork();
1963
if(hook_pid == 0){
1964
/* Child */
1965
/* Raise privileges */
1966
errno = raise_privileges_permanently();
1967
if(errno != 0){
1968
perror_plus("Failed to raise privileges");
1969
_exit(EX_NOPERM);
1970
}
1971
/* Set group */
1972
errno = 0;
1973
ret = setgid(0);
1974
if(ret == -1){
1975
perror_plus("setgid");
1976
_exit(EX_NOPERM);
1977
}
1978
/* Reset supplementary groups */
1979
errno = 0;
1980
ret = setgroups(0, NULL);
1981
if(ret == -1){
1982
perror_plus("setgroups");
1983
_exit(EX_NOPERM);
1984
}
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1986
if(ret == -1){
1987
perror_plus("setenv");
1988
_exit(EX_OSERR);
1989
}
1990
ret = setenv("DEVICE", interface, 1);
1991
if(ret == -1){
1992
perror_plus("setenv");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1996
if(ret == -1){
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
ret = setenv("MODE", mode, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
char *delaystring;
2006
ret = asprintf(&delaystring, "%f", (double)delay);
2007
if(ret == -1){
2008
perror_plus("asprintf");
2009
_exit(EX_OSERR);
2010
}
2011
ret = setenv("DELAY", delaystring, 1);
2012
if(ret == -1){
2013
free(delaystring);
2014
perror_plus("setenv");
2015
_exit(EX_OSERR);
2016
}
2017
free(delaystring);
2018
if(connect_to != NULL){
2019
ret = setenv("CONNECT", connect_to, 1);
2020
if(ret == -1){
2021
perror_plus("setenv");
2022
_exit(EX_OSERR);
2023
}
2024
}
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2026
direntry->d_name,
2027
O_RDONLY));
2028
if(hook_fd == -1){
2029
perror_plus("openat");
2030
_exit(EXIT_FAILURE);
2031
}
2032
if(close(hookdir_fd) == -1){
2033
perror_plus("close");
2034
_exit(EXIT_FAILURE);
2035
}
2036
ret = dup2(devnull, STDIN_FILENO);
2037
if(ret == -1){
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
_exit(EX_OSERR);
2040
}
2041
ret = close(devnull);
2042
if(ret == -1){
2043
perror_plus("close");
2044
_exit(EX_OSERR);
2045
}
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2047
if(ret == -1){
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
_exit(EX_OSERR);
2050
}
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2052
environ) == -1){
2053
perror_plus("fexecve");
2054
_exit(EXIT_FAILURE);
2055
}
2056
} else {
2057
if(hook_pid == -1){
2058
perror_plus("fork");
2059
free(direntry);
2060
continue;
2061
}
2062
int status;
2063
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2064
perror_plus("waitpid");
2065
free(direntry);
2066
continue;
2067
}
2068
if(WIFEXITED(status)){
2069
if(WEXITSTATUS(status) != 0){
2070
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2071
" with status %d\n", direntry->d_name,
2072
WEXITSTATUS(status));
2073
free(direntry);
2074
continue;
2075
}
2076
} else if(WIFSIGNALED(status)){
2077
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2078
" signal %d\n", direntry->d_name,
2079
WTERMSIG(status));
2080
free(direntry);
2081
continue;
2082
} else {
2083
fprintf_plus(stderr, "Warning: network hook \"%s\""
2084
" crashed\n", direntry->d_name);
2085
free(direntry);
2086
continue;
2087
}
2088
}
2089
if(debug){
2090
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2091
direntry->d_name);
2092
}
2093
free(direntry);
2094
}
2095
free(direntries);
2096
if(close(hookdir_fd) == -1){
2097
perror_plus("close");
2098
} else {
2099
hookdir_fd = -1;
2100
}
2101
close(devnull);
2102
}
2103
2104
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
2108
int ret;
2109
struct ifreq network;
2110
unsigned int if_index = if_nametoindex(interface);
2111
if(if_index == 0){
2112
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2113
errno = old_errno;
2114
return ENXIO;
2115
}
2116
2117
if(quit_now){
2118
errno = old_errno;
2119
return EINTR;
2120
}
2121
2122
if(not interface_is_up(interface)){
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
2125
if(not get_flags(interface, &network)){
2126
ret_errno = errno;
2127
fprintf_plus(stderr, "Failed to get flags for interface "
2128
"\"%s\"\n", interface);
2129
errno = old_errno;
2130
return ret_errno;
2131
}
2132
network.ifr_flags |= IFF_UP; /* set flag */
2133
2134
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2135
if(sd == -1){
2136
ret_errno = errno;
2137
perror_plus("socket");
2138
errno = old_errno;
2139
return ret_errno;
2140
}
2141
2142
if(quit_now){
2143
ret = close(sd);
2144
if(ret == -1){
2145
perror_plus("close");
2146
}
2147
errno = old_errno;
2148
return EINTR;
2149
}
2150
2151
if(debug){
2152
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2153
interface);
2154
}
2155
2156
/* Raise privileges */
2157
ret_errno = raise_privileges();
2158
if(ret_errno != 0){
2159
errno = ret_errno;
2160
perror_plus("Failed to raise privileges");
2161
}
2162
2163
#ifdef __linux__
2164
int ret_linux;
2165
bool restore_loglevel = false;
2166
if(ret_errno == 0){
2167
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2168
messages about the network interface to mess up the prompt */
2169
ret_linux = klogctl(8, NULL, 5);
2170
if(ret_linux == -1){
2171
perror_plus("klogctl");
2172
} else {
2173
restore_loglevel = true;
2174
}
2175
}
2176
#endif /* __linux__ */
2177
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2178
ioctl_errno = errno;
2179
#ifdef __linux__
2180
if(restore_loglevel){
2181
ret_linux = klogctl(7, NULL, 0);
2182
if(ret_linux == -1){
2183
perror_plus("klogctl");
2184
}
2185
}
2186
#endif /* __linux__ */
2187
2188
/* If raise_privileges() succeeded above */
2189
if(ret_errno == 0){
2190
/* Lower privileges */
2191
ret_errno = lower_privileges();
2192
if(ret_errno != 0){
2193
errno = ret_errno;
2194
perror_plus("Failed to lower privileges");
2195
}
2196
}
2197
2198
/* Close the socket */
2199
ret = close(sd);
2200
if(ret == -1){
2201
perror_plus("close");
2202
}
2203
2204
if(ret_setflags == -1){
2205
errno = ioctl_errno;
2206
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2207
errno = old_errno;
2208
return ioctl_errno;
2209
}
2210
} else if(debug){
2211
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2212
interface);
2213
}
2214
2215
/* Sleep checking until interface is running.
2216
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
2218
if(interface_is_running(interface)){
2219
break;
2220
}
2221
struct timespec sleeptime = { .tv_nsec = 250000000 };
2222
ret = nanosleep(&sleeptime, NULL);
2223
if(ret == -1 and errno != EINTR){
2224
perror_plus("nanosleep");
2225
}
2226
}
2227
2228
errno = old_errno;
2229
return 0;
2230
}
2231
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2235
struct ifreq network;
2236
unsigned int if_index = if_nametoindex(interface);
2237
if(if_index == 0){
2238
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2239
errno = old_errno;
2240
return ENXIO;
2241
}
2242
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network) and debug){
2246
ret_errno = errno;
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
return ret_errno;
2251
}
2252
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2253
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
2256
ret_errno = errno;
2257
perror_plus("socket");
2258
errno = old_errno;
2259
return ret_errno;
2260
}
2261
2262
if(debug){
2263
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2264
interface);
2265
}
2266
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2269
if(ret_errno != 0){
2270
errno = ret_errno;
2271
perror_plus("Failed to raise privileges");
2272
}
2273
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2276
2277
/* If raise_privileges() succeeded above */
2278
if(ret_errno == 0){
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("Failed to lower privileges");
2284
}
2285
}
2286
2287
/* Close the socket */
2288
int ret = close(sd);
2289
if(ret == -1){
2290
perror_plus("close");
2291
}
2292
2293
if(ret_setflags == -1){
2294
errno = ioctl_errno;
2295
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2296
errno = old_errno;
2297
return ioctl_errno;
2298
}
2299
} else if(debug){
2300
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2301
interface);
2302
}
2303
2304
errno = old_errno;
2305
return 0;
2306
}
2307
2308
1421
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
2314
1422
AvahiSServiceBrowser *sb = NULL;
2315
error_t ret_errno;
1423
int error;
2316
1424
int ret;
2317
1425
intmax_t tmpmax;
2318
1426
char *tmp;
2319
1427
int exitcode = EXIT_SUCCESS;
2320
char *interfaces_to_take_down = NULL;
2321
size_t interfaces_to_take_down_size = 0;
2322
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2323
char old_tempdir[] = "/tmp/mandosXXXXXX";
2324
char *tempdir = NULL;
1428
const char *interface = "";
1429
struct ifreq network;
1430
int sd = -1;
1431
bool take_down_interface = false;
1432
uid_t uid;
1433
gid_t gid;
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1435
bool tempdir_created = false;
2325
1436
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2326
1437
const char *seckey = PATHDIR "/" SECKEY;
2327
1438
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
char *interfaces_hooks = NULL;
2330
1439
2331
1440
bool gnutls_initialized = false;
2332
1441
bool gpgme_initialized = false;
2384
1493
.doc = "Bit length of the prime number used in the"
2385
1494
" Diffie-Hellman key exchange",
2386
1495
.group = 2 },
2387
{ .name = "dh-params", .key = 134,
2388
.arg = "FILE",
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2391
.group = 2 },
2392
1496
{ .name = "priority", .key = 130,
2393
1497
.arg = "STRING",
2394
1498
.doc = "GnuTLS priority string for the TLS handshake",
2399
1503
.group = 2 },
2400
1504
{ .name = "retry", .key = 132,
2401
1505
.arg = "SECONDS",
2402
.doc = "Retry interval used when denied by the Mandos server",
1506
.doc = "Retry interval used when denied by the mandos server",
2403
1507
.group = 2 },
2404
1508
{ .name = "network-hook-dir", .key = 133,
2405
1509
.arg = "DIR",
2428
1532
connect_to = arg;
2429
1533
break;
2430
1534
case 'i': /* --interface */
2431
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2432
arg, (int)',');
2433
if(ret_errno != 0){
2434
argp_error(state, "%s", strerror(ret_errno));
2435
}
1535
interface = arg;
2436
1536
break;
2437
1537
case 's': /* --seckey */
2438
1538
seckey = arg;
2449
1549
}
2450
1550
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2451
1551
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
2455
1552
case 130: /* --priority */
2456
1553
mc.priority = arg;
2457
1554
break;
2484
1581
argp_state_help(state, state->out_stream,
2485
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2486
1583
case 'V': /* --version */
2487
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
2488
1586
exit(argp_err_exit_status);
2489
1587
break;
2490
1588
default:
2497
1595
.args_doc = "",
2498
1596
.doc = "Mandos client -- Get and decrypt"
2499
1597
" passwords from a Mandos server" };
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
1598
ret = argp_parse(&argp, argc, argv,
1599
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1600
switch(ret){
2503
1601
case 0:
2504
1602
break;
2505
1603
case ENOMEM:
2506
1604
default:
2507
errno = ret_errno;
1605
errno = ret;
2508
1606
perror_plus("argp_parse");
2509
1607
exitcode = EX_OSERR;
2510
1608
goto end;
2513
1611
goto end;
2514
1612
}
2515
1613
}
2516
1614
2517
1615
{
2518
1616
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
2520
2521
/* Re-raise privileges */
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2525
perror_plus("Failed to raise privileges");
1617
<http://bugs.debian.org/633582> */
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
2526
1683
} else {
2527
struct stat st;
2528
2529
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2530
int seckey_fd = open(seckey, O_RDONLY);
2531
if(seckey_fd == -1){
2532
perror_plus("open");
2533
} else {
2534
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2535
if(ret == -1){
2536
perror_plus("fstat");
2537
} else {
2538
if(S_ISREG(st.st_mode)
2539
and st.st_uid == 0 and st.st_gid == 0){
2540
ret = fchown(seckey_fd, uid, gid);
2541
if(ret == -1){
2542
perror_plus("fchown");
2543
}
2544
}
2545
}
2546
close(seckey_fd);
2547
}
2548
}
2549
2550
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2551
int pubkey_fd = open(pubkey, O_RDONLY);
2552
if(pubkey_fd == -1){
2553
perror_plus("open");
2554
} else {
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2556
if(ret == -1){
2557
perror_plus("fstat");
2558
} else {
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(pubkey_fd, uid, gid);
2562
if(ret == -1){
2563
perror_plus("fchown");
2564
}
2565
}
2566
}
2567
close(pubkey_fd);
2568
}
2569
}
2570
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2576
} else {
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2578
if(ret == -1){
2579
perror_plus("fstat");
2580
} else {
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2584
if(ret == -1){
2585
perror_plus("fchown");
2586
}
2587
}
2588
}
2589
close(dhparams_fd);
2590
}
2591
}
2592
2593
/* Lower privileges */
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2597
perror_plus("Failed to lower privileges");
2598
}
2599
}
2600
}
2601
2602
/* Remove invalid interface names (except "none") */
2603
{
2604
char *interface = NULL;
2605
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2606
interface))){
2607
if(strcmp(interface, "none") != 0
2608
and if_nametoindex(interface) == 0){
2609
if(interface[0] != '\0'){
2610
fprintf_plus(stderr, "Not using nonexisting interface"
2611
" \"%s\"\n", interface);
2612
}
2613
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2614
interface = NULL;
2615
}
2616
}
2617
}
2618
2619
/* Run network hooks */
2620
{
2621
if(mc.interfaces != NULL){
2622
interfaces_hooks = malloc(mc.interfaces_size);
2623
if(interfaces_hooks == NULL){
2624
perror_plus("malloc");
2625
goto end;
2626
}
2627
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2628
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2629
}
2630
run_network_hooks("start", interfaces_hooks != NULL ?
2631
interfaces_hooks : "", delay);
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1771
}
2632
1772
}
2633
1773
2634
1774
if(not debug){
2635
1775
avahi_set_log_function(empty_log);
2636
1776
}
2637
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
2638
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2639
1813
from the signal handler */
2640
1814
/* Initialize the pseudo-RNG for Avahi */
2641
1815
srand((unsigned int) time(NULL));
2642
simple_poll = avahi_simple_poll_new();
2643
if(simple_poll == NULL){
2644
fprintf_plus(stderr,
2645
"Avahi: Failed to create simple poll object.\n");
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
2646
1820
exitcode = EX_UNAVAILABLE;
2647
1821
goto end;
2648
1822
}
2710
1884
}
2711
1885
}
2712
1886
2713
/* If no interfaces were specified, make a list */
2714
if(mc.interfaces == NULL){
2715
struct dirent **direntries = NULL;
2716
/* Look for any good interfaces */
2717
ret = scandir(sys_class_net, &direntries, good_interface,
2718
alphasort);
2719
if(ret >= 1){
2720
/* Add all found interfaces to interfaces list */
2721
for(int i = 0; i < ret; ++i){
2722
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2723
direntries[i]->d_name);
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("argz_add");
2727
free(direntries[i]);
2728
continue;
2729
}
2730
if(debug){
2731
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2732
direntries[i]->d_name);
2733
}
2734
free(direntries[i]);
2735
}
2736
free(direntries);
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1894
goto end;
1895
}
1896
1897
if(quit_now){
1898
goto end;
1899
}
1900
1901
/* Re-raise priviliges */
1902
errno = 0;
1903
ret = seteuid(0);
1904
if(ret == -1){
1905
perror_plus("seteuid");
1906
}
1907
1908
#ifdef __linux__
1909
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1911
ret = klogctl(8, NULL, 5);
1912
bool restore_loglevel = true;
1913
if(ret == -1){
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1916
}
1917
#endif /* __linux__ */
1918
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
if(sd < 0){
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1923
#ifdef __linux__
1924
if(restore_loglevel){
1925
ret = klogctl(7, NULL, 0);
1926
if(ret == -1){
1927
perror_plus("klogctl");
1928
}
1929
}
1930
#endif /* __linux__ */
1931
/* Lower privileges */
1932
errno = 0;
1933
ret = seteuid(uid);
1934
if(ret == -1){
1935
perror_plus("seteuid");
1936
}
1937
goto end;
1938
}
1939
strcpy(network.ifr_name, interface);
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
if(ret == -1){
1942
perror_plus("ioctl SIOCGIFFLAGS");
1943
#ifdef __linux__
1944
if(restore_loglevel){
1945
ret = klogctl(7, NULL, 0);
1946
if(ret == -1){
1947
perror_plus("klogctl");
1948
}
1949
}
1950
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
if((network.ifr_flags & IFF_UP) == 0){
1961
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
if(ret == -1){
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1968
#ifdef __linux__
1969
if(restore_loglevel){
1970
ret = klogctl(7, NULL, 0);
1971
if(ret == -1){
1972
perror_plus("klogctl");
1973
}
1974
}
1975
#endif /* __linux__ */
1976
/* Lower privileges */
1977
errno = 0;
1978
ret = seteuid(uid);
1979
if(ret == -1){
1980
perror_plus("seteuid");
1981
}
1982
goto end;
1983
}
1984
}
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1987
for(int i=0; i < delay * 4; i++){
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
if(ret == -1){
1990
perror_plus("ioctl SIOCGIFFLAGS");
1991
} else if(network.ifr_flags & IFF_RUNNING){
1992
break;
1993
}
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
ret = nanosleep(&sleeptime, NULL);
1996
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1998
}
1999
}
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
if(ret == -1){
2004
perror_plus("close");
2005
}
2006
}
2007
#ifdef __linux__
2008
if(restore_loglevel){
2009
/* Restores kernel loglevel to default */
2010
ret = klogctl(7, NULL, 0);
2011
if(ret == -1){
2012
perror_plus("klogctl");
2013
}
2014
}
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2017
errno = 0;
2018
if(take_down_interface){
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2737
2024
} else {
2738
if(ret == 0){
2739
free(direntries);
2740
}
2741
fprintf_plus(stderr, "Could not find a network interface\n");
2742
exitcode = EXIT_FAILURE;
2743
goto end;
2744
}
2745
}
2746
2747
/* Bring up interfaces which are down, and remove any "none"s */
2748
{
2749
char *interface = NULL;
2750
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2751
interface))){
2752
/* If interface name is "none", stop bringing up interfaces.
2753
Also remove all instances of "none" from the list */
2754
if(strcmp(interface, "none") == 0){
2755
argz_delete(&mc.interfaces, &mc.interfaces_size,
2756
interface);
2757
interface = NULL;
2758
while((interface = argz_next(mc.interfaces,
2759
mc.interfaces_size, interface))){
2760
if(strcmp(interface, "none") == 0){
2761
argz_delete(&mc.interfaces, &mc.interfaces_size,
2762
interface);
2763
interface = NULL;
2764
}
2765
}
2766
break;
2767
}
2768
bool interface_was_up = interface_is_up(interface);
2769
errno = bring_up_interface(interface, delay);
2770
if(not interface_was_up){
2771
if(errno != 0){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2774
} else {
2775
errno = argz_add(&interfaces_to_take_down,
2776
&interfaces_to_take_down_size,
2777
interface);
2778
if(errno != 0){
2779
perror_plus("argz_add");
2780
}
2781
}
2782
}
2783
}
2784
if(debug and (interfaces_to_take_down == NULL)){
2785
fprintf_plus(stderr, "No interfaces were brought up\n");
2786
}
2787
}
2788
2789
/* If we only got one interface, explicitly use only that one */
2790
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2791
if(debug){
2792
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2793
mc.interfaces);
2794
}
2795
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2025
/* Lower privileges permanently */
2026
ret = setuid(uid);
2027
if(ret == -1){
2028
perror_plus("setuid");
2029
}
2030
}
2796
2031
}
2797
2032
2798
2033
if(quit_now){
2799
2034
goto end;
2800
2035
}
2801
2036
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2037
ret = init_gnutls_global(pubkey, seckey);
2803
2038
if(ret == -1){
2804
fprintf_plus(stderr, "init_gnutls_global failed\n");
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2805
2041
exitcode = EX_UNAVAILABLE;
2806
2042
goto end;
2807
2043
} else {
2812
2048
goto end;
2813
2049
}
2814
2050
2815
/* Try /run/tmp before /tmp */
2816
tempdir = mkdtemp(run_tempdir);
2817
if(tempdir == NULL and errno == ENOENT){
2818
if(debug){
2819
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2820
run_tempdir, old_tempdir);
2821
}
2822
tempdir = mkdtemp(old_tempdir);
2823
}
2824
if(tempdir == NULL){
2051
if(mkdtemp(tempdir) == NULL){
2825
2052
perror_plus("mkdtemp");
2826
2053
goto end;
2827
2054
}
2055
tempdir_created = true;
2828
2056
2829
2057
if(quit_now){
2830
2058
goto end;
2831
2059
}
2832
2060
2833
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2834
fprintf_plus(stderr, "init_gpgme failed\n");
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2835
2064
exitcode = EX_UNAVAILABLE;
2836
2065
goto end;
2837
2066
} else {
2846
2075
/* Connect directly, do not use Zeroconf */
2847
2076
/* (Mainly meant for debugging) */
2848
2077
char *address = strrchr(connect_to, ':');
2849
2850
2078
if(address == NULL){
2851
fprintf_plus(stderr, "No colon in address\n");
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
2852
2081
exitcode = EX_USAGE;
2853
2082
goto end;
2854
2083
}
2857
2086
goto end;
2858
2087
}
2859
2088
2860
in_port_t port;
2089
uint16_t port;
2861
2090
errno = 0;
2862
2091
tmpmax = strtoimax(address+1, &tmp, 10);
2863
2092
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2864
or tmpmax != (in_port_t)tmpmax){
2865
fprintf_plus(stderr, "Bad port number\n");
2093
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
2866
2096
exitcode = EX_USAGE;
2867
2097
goto end;
2868
2098
}
2869
2099
2870
2100
if(quit_now){
2871
2101
goto end;
2872
2102
}
2873
2103
2874
port = (in_port_t)tmpmax;
2104
port = (uint16_t)tmpmax;
2875
2105
*address = '\0';
2876
2106
/* Colon in address indicates IPv6 */
2877
2107
int af;
2893
2123
}
2894
2124
2895
2125
while(not quit_now){
2896
ret = start_mandos_communication(address, port, if_index, af,
2897
&mc);
2126
ret = start_mandos_communication(address, port, if_index, af);
2898
2127
if(quit_now or ret == 0){
2899
2128
break;
2900
2129
}
2901
2130
if(debug){
2902
fprintf_plus(stderr, "Retrying in %d seconds\n",
2903
(int)retry_interval);
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2904
2133
}
2905
sleep((unsigned int)retry_interval);
2134
sleep((int)retry_interval);
2906
2135
}
2907
2136
2908
if(not quit_now){
2137
if (not quit_now){
2909
2138
exitcode = EXIT_SUCCESS;
2910
2139
}
2911
2140
2926
2155
config.publish_domain = 0;
2927
2156
2928
2157
/* Allocate a new server */
2929
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
2158
mc.server = avahi_server_new(avahi_simple_poll_get
2159
(mc.simple_poll), &config, NULL,
2160
NULL, &error);
2931
2161
2932
2162
/* Free the Avahi configuration data */
2933
2163
avahi_server_config_free(&config);
2935
2165
2936
2166
/* Check if creating the Avahi server object succeeded */
2937
2167
if(mc.server == NULL){
2938
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2940
2171
exitcode = EX_UNAVAILABLE;
2941
2172
goto end;
2942
2173
}
2948
2179
/* Create the Avahi service browser */
2949
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2950
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2951
NULL, 0, browse_callback,
2952
(void *)&mc);
2182
NULL, 0, browse_callback, NULL);
2953
2183
if(sb == NULL){
2954
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2955
avahi_strerror(avahi_server_errno(mc.server)));
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
2186
avahi_strerror(avahi_server_errno(mc.server)));
2956
2187
exitcode = EX_UNAVAILABLE;
2957
2188
goto end;
2958
2189
}
2964
2195
/* Run the main loop */
2965
2196
2966
2197
if(debug){
2967
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2968
2200
}
2969
2970
ret = avahi_loop_with_timeout(simple_poll,
2971
(int)(retry_interval * 1000), &mc);
2201
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2972
2204
if(debug){
2973
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2974
(ret == 0) ? "successfully" : "with error");
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2975
2208
}
2976
2209
2977
2210
end:
2978
2211
2979
2212
if(debug){
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
2987
2215
}
2988
2216
2989
2217
/* Cleanup things */
2990
free(mc.interfaces);
2991
2992
2218
if(sb != NULL)
2993
2219
avahi_s_service_browser_free(sb);
2994
2220
2995
2221
if(mc.server != NULL)
2996
2222
avahi_server_free(mc.server);
2997
2223
2998
if(simple_poll != NULL)
2999
avahi_simple_poll_free(simple_poll);
2224
if(mc.simple_poll != NULL)
2225
avahi_simple_poll_free(mc.simple_poll);
3000
2226
3001
2227
if(gnutls_initialized){
3002
2228
gnutls_certificate_free_credentials(mc.cred);
2229
gnutls_global_deinit();
3003
2230
gnutls_dh_params_deinit(mc.dh_params);
3004
2231
}
3005
2232
3006
2233
if(gpgme_initialized){
3007
2234
gpgme_release(mc.ctx);
3008
2235
}
3009
2236
3010
2237
/* Cleans up the circular linked list of Mandos servers the client
3011
2238
has seen */
3012
2239
if(mc.current_server != NULL){
3013
2240
mc.current_server->prev->next = NULL;
3014
2241
while(mc.current_server != NULL){
3015
2242
server *next = mc.current_server->next;
3016
#ifdef __GNUC__
3017
#pragma GCC diagnostic push
3018
#pragma GCC diagnostic ignored "-Wcast-qual"
3019
#endif
3020
free((char *)(mc.current_server->ip));
3021
#ifdef __GNUC__
3022
#pragma GCC diagnostic pop
3023
#endif
3024
2243
free(mc.current_server);
3025
2244
mc.current_server = next;
3026
2245
}
3027
2246
}
3028
2247
3029
/* Re-raise privileges */
3030
{
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to raise privileges");
3035
} else {
3036
3037
/* Run network hooks */
3038
run_network_hooks("stop", interfaces_hooks != NULL ?
3039
interfaces_hooks : "", delay);
3040
3041
/* Take down the network interfaces which were brought up */
3042
{
3043
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to take down interface");
3051
}
3052
}
3053
if(debug and (interfaces_to_take_down == NULL)){
3054
fprintf_plus(stderr, "No interfaces needed to be taken"
3055
" down\n");
3056
}
3057
}
2248
/* XXX run network hooks "stop" here */
2249
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2253
errno = 0;
2254
ret = seteuid(0);
2255
if(ret == -1){
2256
perror_plus("seteuid");
3058
2257
}
3059
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
3063
perror_plus("Failed to lower privileges permanently");
2258
if(geteuid() == 0){
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2265
if(ret == -1){
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
}
2268
}
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
3064
2279
}
3065
2280
}
3066
2281
3067
free(interfaces_to_take_down);
3068
free(interfaces_hooks);
3069
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
2282
/* Removes the GPGME temp directory and all files inside */
2283
if(tempdir_created){
3072
2284
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
alphasort);
2288
if (numentries > 0){
3086
2289
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
3124
/* Removes the GPGME temp directory and all files inside */
3125
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
2290
direntry = direntries[i];
2291
char *fullname = NULL;
2292
ret = asprintf(&fullname, "%s/%s", tempdir,
2293
direntry->d_name);
2294
if(ret < 0){
2295
perror_plus("asprintf");
2296
continue;
2297
}
2298
ret = remove(fullname);
2299
if(ret == -1){
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2302
}
2303
free(fullname);
2304
}
2305
}
2306
2307
/* need to clean even if 0 because man page doesn't specify */
2308
free(direntries);
2309
if (numentries == -1){
2310
perror_plus("scandir");
2311
}
2312
ret = rmdir(tempdir);
2313
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2315
}
3127
2316
}
3128
2317
3129
2318
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0