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- Committer: Teddy Hogeborn
- Date: 2018-02-22 19:33:54 UTC
- mfrom: (237.4.98 release)
- Revision ID: teddy@recompile.se-20180222193354-uivyobeq4l5wyjt0
Merge from release branch
- files added:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
55
57
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
80
87
argp_state, struct argp,
85
92
raise() */
86
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
88
104
89
105
#ifdef __linux__
90
106
#include <sys/klog.h> /* klogctl() */
108
124
init_gnutls_session(),
109
125
GNUTLS_* */
110
126
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
113
129
114
130
/* GPGME */
115
131
#include <gpgme.h> /* All GPGME types, constants and
123
139
#define PATHDIR "/conf/conf.d/mandos"
124
140
#define SECKEY "seckey.txt"
125
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
143
127
144
bool debug = false;
128
145
static const char mandos_protocol_version[] = "1";
130
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
148
static const char sys_class_net[] = "/sys/class/net";
132
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
133
154
134
155
/* Doubly linked list that need to be circularly linked when used */
135
156
typedef struct server{
136
157
const char *ip;
137
uint16_t port;
158
in_port_t port;
138
159
AvahiIfIndex if_index;
139
160
int af;
140
161
struct timespec last_seen;
144
165
145
166
/* Used for passing in values through the Avahi callback functions */
146
167
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
168
AvahiServer *server;
149
169
gnutls_certificate_credentials_t cred;
150
170
unsigned int dh_bits;
152
172
const char *priority;
153
173
gpgme_ctx_t ctx;
154
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
155
177
} mandos_context;
156
178
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
162
181
163
182
sig_atomic_t quit_now = 0;
164
183
int signal_received = 0;
165
184
166
185
/* Function to use when printing errors */
167
186
void perror_plus(const char *print_text){
187
int e = errno;
168
188
fprintf(stderr, "Mandos plugin %s: ",
169
189
program_invocation_short_name);
190
errno = e;
170
191
perror(print_text);
171
192
}
172
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
173
204
/*
174
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
206
* bytes. "buffer_capacity" is how much is currently allocated,
176
207
* "buffer_length" is how much is already used.
177
208
*/
209
__attribute__((nonnull, warn_unused_result))
178
210
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
211
size_t buffer_capacity){
180
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
183
219
return 0;
184
220
}
221
*buffer = new_buf;
185
222
buffer_capacity += BUFFER_SIZE;
186
223
}
187
224
return buffer_capacity;
188
225
}
189
226
190
227
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
194
231
int ret;
195
232
server *new_server = malloc(sizeof(server));
196
233
if(new_server == NULL){
197
234
perror_plus("malloc");
198
return -1;
235
return false;
199
236
}
200
237
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
238
.port = port,
239
.if_index = if_index,
240
.af = af };
204
241
if(new_server->ip == NULL){
205
242
perror_plus("strdup");
206
return -1;
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
207
259
}
208
260
/* Special case of first server */
209
if (mc.current_server == NULL){
261
if(*current_server == NULL){
210
262
new_server->next = new_server;
211
263
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
264
*current_server = new_server;
214
265
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
217
269
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
270
(*current_server)->prev = new_server;
271
}
272
return true;
226
273
}
227
274
228
275
/*
229
276
* Initialize GPGME.
230
277
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
233
283
gpgme_error_t rc;
234
284
gpgme_engine_info_t engine_info;
235
285
236
237
286
/*
238
287
* Helper function to insert pub and seckey to the engine keyring.
239
288
*/
240
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
241
290
int ret;
242
291
int fd;
243
292
gpgme_data_t pgp_data;
250
299
251
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
301
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
255
304
return false;
256
305
}
257
306
258
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
259
308
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
262
311
return false;
263
312
}
264
313
265
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
266
315
if(ret == -1){
267
316
perror_plus("close");
268
317
}
271
320
}
272
321
273
322
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
323
fprintf_plus(stderr, "Initializing GPGME\n");
275
324
}
276
325
277
326
/* Init GPGME */
278
327
gpgme_check_version(NULL);
279
328
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
329
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
283
332
return false;
284
333
}
285
334
286
335
/* Set GPGME home directory for the OpenPGP engine only */
287
336
rc = gpgme_get_engine_info(&engine_info);
288
337
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
291
340
return false;
292
341
}
293
342
while(engine_info != NULL){
299
348
engine_info = engine_info->next;
300
349
}
301
350
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
303
353
return false;
304
354
}
305
355
306
356
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
308
358
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
311
362
return false;
312
363
}
313
364
322
373
* Decrypt OpenPGP data.
323
374
* Returns -1 on error
324
375
*/
376
__attribute__((nonnull, warn_unused_result))
325
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
378
size_t crypto_size,
327
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
328
381
gpgme_data_t dh_crypto, dh_plain;
329
382
gpgme_error_t rc;
330
383
ssize_t ret;
332
385
ssize_t plaintext_length = 0;
333
386
334
387
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
389
}
337
390
338
391
/* Create new GPGME data buffer from memory cryptotext */
339
392
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
393
0);
341
394
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
344
397
return -1;
345
398
}
346
399
347
400
/* Create new empty GPGME data buffer for the plaintext */
348
401
rc = gpgme_data_new(&dh_plain);
349
402
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
352
406
gpgme_data_release(dh_crypto);
353
407
return -1;
354
408
}
355
409
356
410
/* Decrypt data from the cryptotext data buffer to the plaintext
357
411
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
413
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
362
416
plaintext_length = -1;
363
417
if(debug){
364
418
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
366
420
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
422
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
373
427
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
429
}
376
430
gpgme_recipient_t recipient;
377
431
recipient = result->recipients;
378
432
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
385
440
recipient = recipient->next;
386
441
}
387
442
}
390
445
}
391
446
392
447
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
448
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
449
}
395
450
396
451
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
458
*plaintext = NULL;
404
459
while(true){
405
460
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
461
(size_t)plaintext_length,
462
plaintext_capacity);
408
463
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
464
perror_plus("incbuffer");
465
plaintext_length = -1;
466
goto decrypt_end;
412
467
}
413
468
414
469
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
482
}
428
483
429
484
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
485
fprintf_plus(stderr, "Decrypted password is: ");
431
486
for(ssize_t i = 0; i < plaintext_length; i++){
432
487
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
488
}
444
499
return plaintext_length;
445
500
}
446
501
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
450
if(ret == NULL)
451
ret = "(unknown)";
452
return ret;
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
453
513
}
454
514
455
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
456
517
static void debuggnutls(__attribute__((unused)) int level,
457
518
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
519
fprintf_plus(stderr, "GnuTLS: %s", string);
459
520
}
460
521
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
461
523
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
463
527
int ret;
528
unsigned int uret;
464
529
465
530
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
467
}
468
469
ret = gnutls_global_init();
470
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
473
return -1;
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
474
532
}
475
533
476
534
if(debug){
482
540
}
483
541
484
542
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
544
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
489
gnutls_global_deinit();
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
490
547
return -1;
491
548
}
492
549
493
550
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
497
555
}
498
556
499
557
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
558
(mc->cred, pubkeyfilename, seckeyfilename,
501
559
GNUTLS_OPENPGP_FMT_BASE64);
502
560
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
561
fprintf_plus(stderr,
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
508
566
goto globalfail;
509
567
}
510
568
511
569
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
513
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
516
goto globalfail;
517
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
522
goto globalfail;
523
}
524
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
575
goto globalfail;
576
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
755
527
756
return 0;
528
757
529
758
globalfail:
530
759
531
gnutls_certificate_free_credentials(mc.cred);
532
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
760
gnutls_certificate_free_credentials(mc->cred);
761
gnutls_dh_params_deinit(mc->dh_params);
534
762
return -1;
535
763
}
536
764
537
static int init_gnutls_session(gnutls_session_t *session){
765
__attribute__((nonnull, warn_unused_result))
766
static int init_gnutls_session(gnutls_session_t *session,
767
mandos_context *mc){
538
768
int ret;
539
769
/* GnuTLS session creation */
540
770
do {
544
774
}
545
775
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
776
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
777
fprintf_plus(stderr,
778
"Error in GnuTLS session initialization: %s\n",
779
safer_gnutls_strerror(ret));
549
780
}
550
781
551
782
{
552
783
const char *err;
553
784
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
785
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
786
if(quit_now){
556
787
gnutls_deinit(*session);
557
788
return -1;
558
789
}
559
790
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
791
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
792
fprintf_plus(stderr, "Syntax error at: %s\n", err);
793
fprintf_plus(stderr, "GnuTLS error: %s\n",
794
safer_gnutls_strerror(ret));
564
795
gnutls_deinit(*session);
565
796
return -1;
566
797
}
568
799
569
800
do {
570
801
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
802
mc->cred);
572
803
if(quit_now){
573
804
gnutls_deinit(*session);
574
805
return -1;
575
806
}
576
807
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
808
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
809
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
810
safer_gnutls_strerror(ret));
580
811
gnutls_deinit(*session);
581
812
return -1;
582
813
}
584
815
/* ignore client certificate if any. */
585
816
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
586
817
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
588
589
818
return 0;
590
819
}
591
820
593
822
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
594
823
__attribute__((unused)) const char *txt){}
595
824
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
596
1043
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
1044
__attribute__((nonnull, warn_unused_result))
1045
static int start_mandos_communication(const char *ip, in_port_t port,
598
1046
AvahiIfIndex if_index,
599
int af){
1047
int af, mandos_context *mc){
600
1048
int ret, tcp_sd = -1;
601
1049
ssize_t sret;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
1050
struct sockaddr_storage to;
606
1051
char *buffer = NULL;
607
1052
char *decrypted_buffer = NULL;
608
1053
size_t buffer_length = 0;
611
1056
int retval = -1;
612
1057
gnutls_session_t session;
613
1058
int pf; /* Protocol family */
1059
bool route_added = false;
614
1060
615
1061
errno = 0;
616
1062
627
1073
pf = PF_INET;
628
1074
break;
629
1075
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
1076
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
1077
errno = EINVAL;
632
1078
return -1;
633
1079
}
634
1080
635
ret = init_gnutls_session(&session);
1081
/* If the interface is specified and we have a list of interfaces */
1082
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1083
/* Check if the interface is one of the interfaces we are using */
1084
bool match = false;
1085
{
1086
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
match = true;
1092
break;
1093
}
1094
}
1095
}
1096
if(not match){
1097
/* This interface does not match any in the list, so we don't
1098
connect to the server */
1099
if(debug){
1100
char interface[IF_NAMESIZE];
1101
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1102
perror_plus("if_indextoname");
1103
} else {
1104
fprintf_plus(stderr, "Skipping server on non-used interface"
1105
" \"%s\"\n",
1106
if_indextoname((unsigned int)if_index,
1107
interface));
1108
}
1109
}
1110
return -1;
1111
}
1112
}
1113
1114
ret = init_gnutls_session(&session, mc);
636
1115
if(ret != 0){
637
1116
return -1;
638
1117
}
639
1118
640
1119
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
1120
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1121
PRIuMAX "\n", ip, (uintmax_t)port);
643
1122
}
644
1123
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
646
1125
if(tcp_sd < 0){
647
1126
int e = errno;
648
1127
perror_plus("socket");
655
1134
goto mandos_end;
656
1135
}
657
1136
658
memset(&to, 0, sizeof(to));
659
1137
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
662
1141
} else { /* IPv4 */
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
665
1145
}
666
1146
if(ret < 0 ){
667
1147
int e = errno;
671
1151
}
672
1152
if(ret == 0){
673
1153
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
1154
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
1155
errno = e;
676
1156
goto mandos_end;
677
1157
}
678
1158
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
1159
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1160
if(IN6_IS_ADDR_LINKLOCAL
1161
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
686
1162
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
1163
fprintf_plus(stderr, "An IPv6 link-local address is"
1164
" incomplete without a network interface\n");
689
1165
errno = EINVAL;
690
1166
goto mandos_end;
691
1167
}
692
1168
/* Set the network interface number as scope */
693
to.in6.sin6_scope_id = (uint32_t)if_index;
1169
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
1170
}
695
1171
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
1172
((struct sockaddr_in *)&to)->sin_port = htons(port);
699
1173
}
700
1174
701
1175
if(quit_now){
709
1183
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
1184
perror_plus("if_indextoname");
711
1185
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
1186
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1187
"\n", ip, interface, (uintmax_t)port);
714
1188
}
715
1189
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
1190
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1191
ip, (uintmax_t)port);
718
1192
}
719
1193
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
1194
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
722
if(af == AF_INET6){
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
725
} else {
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
728
}
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
731
} else {
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
}
735
}
736
}
737
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
if(af == AF_INET6){
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
} else {
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
}
748
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
754
goto mandos_end;
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
1195
if(af == AF_INET6){
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in6),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
} else {
1201
ret = getnameinfo((struct sockaddr *)&to,
1202
sizeof(struct sockaddr_in),
1203
addrstr, sizeof(addrstr), NULL, 0,
1204
NI_NUMERICHOST);
1205
}
1206
if(ret == EAI_SYSTEM){
1207
perror_plus("getnameinfo");
1208
} else if(ret != 0) {
1209
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1210
} else if(strcmp(addrstr, ip) != 0){
1211
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1212
}
1213
}
1214
1215
if(quit_now){
1216
errno = EINTR;
1217
goto mandos_end;
1218
}
1219
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
760
1275
}
761
1276
762
1277
const char *out = mandos_protocol_version;
764
1279
while(true){
765
1280
size_t out_size = strlen(out);
766
1281
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
1282
out_size - written));
768
1283
if(ret == -1){
769
1284
int e = errno;
770
1285
perror_plus("write");
790
1305
}
791
1306
792
1307
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1308
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
1309
}
795
1310
796
1311
if(quit_now){
798
1313
goto mandos_end;
799
1314
}
800
1315
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1316
/* This casting via intptr_t is to eliminate warning about casting
1317
an int to a pointer type. This is exactly how the GnuTLS Guile
1318
function "set-session-transport-fd!" does it. */
1319
gnutls_transport_set_ptr(session,
1320
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
803
1321
804
1322
if(quit_now){
805
1323
errno = EINTR;
816
1334
817
1335
if(ret != GNUTLS_E_SUCCESS){
818
1336
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1337
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
1338
gnutls_perror(ret);
821
1339
}
822
1340
errno = EPROTO;
826
1344
/* Read OpenPGP packet that contains the wanted password */
827
1345
828
1346
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
1347
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1348
" %s\n", ip);
831
1349
}
832
1350
833
1351
while(true){
838
1356
}
839
1357
840
1358
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
1359
buffer_capacity);
842
1360
if(buffer_capacity == 0){
843
1361
int e = errno;
844
1362
perror_plus("incbuffer");
871
1389
}
872
1390
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
1391
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1392
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1393
"***\n");
875
1394
gnutls_perror(ret);
876
1395
errno = EPROTO;
877
1396
goto mandos_end;
878
1397
}
879
1398
break;
880
1399
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
1400
fprintf_plus(stderr, "Unknown error while reading data from"
1401
" encrypted session with Mandos server\n");
883
1402
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
1403
errno = EIO;
885
1404
goto mandos_end;
890
1409
}
891
1410
892
1411
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
1412
fprintf_plus(stderr, "Closing TLS session\n");
894
1413
}
895
1414
896
1415
if(quit_now){
908
1427
909
1428
if(buffer_length > 0){
910
1429
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
1430
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1431
&decrypted_buffer, mc);
914
1432
if(decrypted_buffer_size >= 0){
915
1433
1434
clearerr(stdout);
916
1435
written = 0;
917
1436
while(written < (size_t) decrypted_buffer_size){
918
1437
if(quit_now){
926
1445
if(ret == 0 and ferror(stdout)){
927
1446
int e = errno;
928
1447
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
1448
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1449
strerror(errno));
931
1450
}
932
1451
errno = e;
933
1452
goto mandos_end;
934
1453
}
935
1454
written += (size_t)ret;
936
1455
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
937
1466
retval = 0;
938
1467
}
939
1468
}
942
1471
943
1472
mandos_end:
944
1473
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
945
1480
int e = errno;
946
1481
free(decrypted_buffer);
947
1482
free(buffer);
948
1483
if(tcp_sd >= 0){
949
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1484
ret = close(tcp_sd);
950
1485
}
951
1486
if(ret == -1){
952
1487
if(e == 0){
977
1512
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
1513
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1514
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1515
void *mc){
1516
if(r == NULL){
1517
return;
1518
}
982
1519
983
1520
/* Called whenever a service has been resolved successfully or
984
1521
timed out */
985
1522
986
1523
if(quit_now){
1524
avahi_s_service_resolver_free(r);
987
1525
return;
988
1526
}
989
1527
990
1528
switch(event){
991
1529
default:
992
1530
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1531
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1532
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1533
domain,
1534
avahi_strerror(avahi_server_errno
1535
(((mandos_context*)mc)->server)));
996
1536
break;
997
1537
998
1538
case AVAHI_RESOLVER_FOUND:
1000
1540
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1541
avahi_address_snprint(ip, sizeof(ip), address);
1002
1542
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1543
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1544
PRIdMAX ") on port %" PRIu16 "\n", name,
1545
host_name, ip, (intmax_t)interface, port);
1006
1546
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1547
int ret = start_mandos_communication(ip, (in_port_t)port,
1548
interface,
1549
avahi_proto_to_af(proto),
1550
mc);
1009
1551
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1552
avahi_simple_poll_quit(simple_poll);
1011
1553
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1554
if(not add_server(ip, (in_port_t)port, interface,
1555
avahi_proto_to_af(proto),
1556
&((mandos_context*)mc)->current_server)){
1557
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1558
" list\n", name);
1559
}
1014
1560
}
1015
1561
}
1016
1562
}
1026
1572
const char *domain,
1027
1573
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1574
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1575
void *mc){
1576
if(b == NULL){
1577
return;
1578
}
1031
1579
1032
1580
/* Called whenever a new services becomes available on the LAN or
1033
1581
is removed from the LAN */
1040
1588
default:
1041
1589
case AVAHI_BROWSER_FAILURE:
1042
1590
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1591
fprintf_plus(stderr, "(Avahi browser) %s\n",
1592
avahi_strerror(avahi_server_errno
1593
(((mandos_context*)mc)->server)));
1594
avahi_simple_poll_quit(simple_poll);
1046
1595
return;
1047
1596
1048
1597
case AVAHI_BROWSER_NEW:
1051
1600
the callback function is called the Avahi server will free the
1052
1601
resolver for us. */
1053
1602
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1603
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1604
interface, protocol, name, type,
1605
domain, protocol, 0,
1606
resolve_callback, mc) == NULL)
1607
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1608
" %s\n", name,
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
1059
1611
break;
1060
1612
1061
1613
case AVAHI_BROWSER_REMOVE:
1064
1616
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1617
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1618
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1619
fprintf_plus(stderr, "No Mandos server found, still"
1620
" searching...\n");
1068
1621
}
1069
1622
break;
1070
1623
}
1079
1632
signal_received = sig;
1080
1633
int old_errno = errno;
1081
1634
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1635
if(simple_poll != NULL){
1636
avahi_simple_poll_quit(simple_poll);
1084
1637
}
1085
1638
errno = old_errno;
1086
1639
}
1087
1640
1641
__attribute__((nonnull, warn_unused_result))
1642
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
int ret;
1644
int old_errno;
1645
1646
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
if(s < 0){
1648
old_errno = errno;
1649
perror_plus("socket");
1650
errno = old_errno;
1651
return false;
1652
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
if(ret == -1){
1657
if(debug){
1658
old_errno = errno;
1659
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1666
}
1667
return false;
1668
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
return true;
1675
}
1676
1677
__attribute__((nonnull, warn_unused_result))
1678
bool good_flags(const char *ifname, const struct ifreq *ifr){
1679
1680
/* Reject the loopback device */
1681
if(ifr->ifr_flags & IFF_LOOPBACK){
1682
if(debug){
1683
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1684
ifname);
1685
}
1686
return false;
1687
}
1688
/* Accept point-to-point devices only if connect_to is specified */
1689
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1690
if(debug){
1691
fprintf_plus(stderr, "Accepting point-to-point interface"
1692
" \"%s\"\n", ifname);
1693
}
1694
return true;
1695
}
1696
/* Otherwise, reject non-broadcast-capable devices */
1697
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1698
if(debug){
1699
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1700
" \"%s\"\n", ifname);
1701
}
1702
return false;
1703
}
1704
/* Reject non-ARP interfaces (including dummy interfaces) */
1705
if(ifr->ifr_flags & IFF_NOARP){
1706
if(debug){
1707
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1708
ifname);
1709
}
1710
return false;
1711
}
1712
1713
/* Accept this device */
1714
if(debug){
1715
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1716
}
1717
return true;
1718
}
1719
1088
1720
/*
1089
1721
* This function determines if a directory entry in /sys/class/net
1090
1722
* corresponds to an acceptable network device.
1091
1723
* (This function is passed to scandir(3) as a filter function.)
1092
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1093
1726
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1727
if(if_entry->d_name[0] == '.'){
1097
1728
return 0;
1098
1729
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1730
1731
struct ifreq ifr;
1732
if(not get_flags(if_entry->d_name, &ifr)){
1733
if(debug){
1734
fprintf_plus(stderr, "Failed to get flags for interface "
1735
"\"%s\"\n", if_entry->d_name);
1736
}
1737
return 0;
1738
}
1739
1740
if(not good_flags(if_entry->d_name, &ifr)){
1741
return 0;
1189
1742
}
1190
1743
return 1;
1191
1744
}
1192
1745
1746
/*
1747
* This function determines if a network interface is up.
1748
*/
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_up(const char *interface){
1751
struct ifreq ifr;
1752
if(not get_flags(interface, &ifr)){
1753
if(debug){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1756
}
1757
return false;
1758
}
1759
1760
return (bool)(ifr.ifr_flags & IFF_UP);
1761
}
1762
1763
/*
1764
* This function determines if a network interface is running
1765
*/
1766
__attribute__((nonnull, warn_unused_result))
1767
bool interface_is_running(const char *interface){
1768
struct ifreq ifr;
1769
if(not get_flags(interface, &ifr)){
1770
if(debug){
1771
fprintf_plus(stderr, "Failed to get flags for interface "
1772
"\"%s\"\n", interface);
1773
}
1774
return false;
1775
}
1776
1777
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1778
}
1779
1780
__attribute__((nonnull, pure, warn_unused_result))
1193
1781
int notdotentries(const struct dirent *direntry){
1194
1782
/* Skip "." and ".." */
1195
1783
if(direntry->d_name[0] == '.'
1201
1789
return 1;
1202
1790
}
1203
1791
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1792
/* Is this directory entry a runnable program? */
1793
__attribute__((nonnull, warn_unused_result))
1794
int runnable_hook(const struct dirent *direntry){
1795
int ret;
1796
size_t sret;
1797
struct stat st;
1798
1799
if((direntry->d_name)[0] == '\0'){
1800
/* Empty name? */
1801
return 0;
1802
}
1803
1804
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1805
"abcdefghijklmnopqrstuvwxyz"
1806
"0123456789"
1807
"_.-");
1808
if((direntry->d_name)[sret] != '\0'){
1809
/* Contains non-allowed characters */
1810
if(debug){
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1812
direntry->d_name);
1813
}
1814
return 0;
1815
}
1816
1817
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1818
if(ret == -1){
1819
if(debug){
1820
perror_plus("Could not stat hook");
1821
}
1822
return 0;
1823
}
1824
if(not (S_ISREG(st.st_mode))){
1825
/* Not a regular file */
1826
if(debug){
1827
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1828
direntry->d_name);
1829
}
1830
return 0;
1831
}
1832
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1833
/* Not executable */
1834
if(debug){
1835
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1836
direntry->d_name);
1837
}
1838
return 0;
1839
}
1840
if(debug){
1841
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1842
direntry->d_name);
1843
}
1844
return 1;
1845
}
1846
1847
__attribute__((nonnull, warn_unused_result))
1848
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1849
mandos_context *mc){
1205
1850
int ret;
1206
1851
struct timespec now;
1207
1852
struct timespec waited_time;
1208
1853
intmax_t block_time;
1209
1854
1210
1855
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1856
if(mc->current_server == NULL){
1857
if(debug){
1858
fprintf_plus(stderr, "Wait until first server is found."
1859
" No timeout!\n");
1215
1860
}
1216
1861
ret = avahi_simple_poll_iterate(s, -1);
1217
1862
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1863
if(debug){
1864
fprintf_plus(stderr, "Check current_server if we should run"
1865
" it, or wait\n");
1221
1866
}
1222
1867
/* the current time */
1223
1868
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1228
1873
/* Calculating in ms how long time between now and server
1229
1874
who we visted longest time ago. Now - last seen. */
1230
1875
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1876
- mc->current_server->last_seen.tv_sec);
1232
1877
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1878
- mc->current_server->last_seen.tv_nsec);
1234
1879
/* total time is 10s/10,000ms.
1235
1880
Converting to s from ms by dividing by 1,000,
1236
1881
and ns to ms by dividing by 1,000,000. */
1238
1883
- ((intmax_t)waited_time.tv_sec * 1000))
1239
1884
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1885
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1886
if(debug){
1887
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1888
block_time);
1243
1889
}
1244
1890
1245
1891
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1892
ret = start_mandos_communication(mc->current_server->ip,
1893
mc->current_server->port,
1894
mc->current_server->if_index,
1895
mc->current_server->af, mc);
1250
1896
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1897
avahi_simple_poll_quit(s);
1252
1898
return 0;
1253
1899
}
1254
1900
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1901
&mc->current_server->last_seen);
1256
1902
if(ret == -1){
1257
1903
perror_plus("clock_gettime");
1258
1904
return -1;
1259
1905
}
1260
mc.current_server = mc.current_server->next;
1906
mc->current_server = mc->current_server->next;
1261
1907
block_time = 0; /* Call avahi to find new Mandos
1262
1908
servers, but don't block */
1263
1909
}
1265
1911
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1912
}
1267
1913
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1914
if(ret > 0 or errno != EINTR){
1269
1915
return (ret != 1) ? ret : 0;
1270
1916
}
1271
1917
}
1272
1918
}
1273
1919
}
1274
1920
1921
__attribute__((nonnull))
1922
void run_network_hooks(const char *mode, const char *interface,
1923
const float delay){
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1930
if(debug){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1933
}
1934
} else {
1935
perror_plus("open");
1936
}
1937
return;
1938
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1947
if(numhooks == -1){
1948
perror_plus("scandir");
1949
close(devnull);
1950
return;
1951
}
1952
struct dirent *direntry;
1953
int ret;
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1956
if(debug){
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1958
direntry->d_name);
1959
}
1960
pid_t hook_pid = fork();
1961
if(hook_pid == 0){
1962
/* Child */
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1966
perror_plus("Failed to raise privileges");
1967
_exit(EX_NOPERM);
1968
}
1969
/* Set group */
1970
errno = 0;
1971
ret = setgid(0);
1972
if(ret == -1){
1973
perror_plus("setgid");
1974
_exit(EX_NOPERM);
1975
}
1976
/* Reset supplementary groups */
1977
errno = 0;
1978
ret = setgroups(0, NULL);
1979
if(ret == -1){
1980
perror_plus("setgroups");
1981
_exit(EX_NOPERM);
1982
}
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
ret = setenv("DEVICE", interface, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1994
if(ret == -1){
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("MODE", mode, 1);
1999
if(ret == -1){
2000
perror_plus("setenv");
2001
_exit(EX_OSERR);
2002
}
2003
char *delaystring;
2004
ret = asprintf(&delaystring, "%f", (double)delay);
2005
if(ret == -1){
2006
perror_plus("asprintf");
2007
_exit(EX_OSERR);
2008
}
2009
ret = setenv("DELAY", delaystring, 1);
2010
if(ret == -1){
2011
free(delaystring);
2012
perror_plus("setenv");
2013
_exit(EX_OSERR);
2014
}
2015
free(delaystring);
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2018
if(ret == -1){
2019
perror_plus("setenv");
2020
_exit(EX_OSERR);
2021
}
2022
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2053
}
2054
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
int status;
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2063
free(direntry);
2064
continue;
2065
}
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2071
free(direntry);
2072
continue;
2073
}
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
2077
WTERMSIG(status));
2078
free(direntry);
2079
continue;
2080
} else {
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
continue;
2085
}
2086
}
2087
if(debug){
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
direntry->d_name);
2090
}
2091
free(direntry);
2092
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
2096
} else {
2097
hookdir_fd = -1;
2098
}
2099
close(devnull);
2100
}
2101
2102
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2106
int ret;
2107
struct ifreq network;
2108
unsigned int if_index = if_nametoindex(interface);
2109
if(if_index == 0){
2110
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2111
errno = old_errno;
2112
return ENXIO;
2113
}
2114
2115
if(quit_now){
2116
errno = old_errno;
2117
return EINTR;
2118
}
2119
2120
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2123
if(not get_flags(interface, &network)){
2124
ret_errno = errno;
2125
fprintf_plus(stderr, "Failed to get flags for interface "
2126
"\"%s\"\n", interface);
2127
errno = old_errno;
2128
return ret_errno;
2129
}
2130
network.ifr_flags |= IFF_UP; /* set flag */
2131
2132
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2133
if(sd == -1){
2134
ret_errno = errno;
2135
perror_plus("socket");
2136
errno = old_errno;
2137
return ret_errno;
2138
}
2139
2140
if(quit_now){
2141
ret = close(sd);
2142
if(ret == -1){
2143
perror_plus("close");
2144
}
2145
errno = old_errno;
2146
return EINTR;
2147
}
2148
2149
if(debug){
2150
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2151
interface);
2152
}
2153
2154
/* Raise privileges */
2155
ret_errno = raise_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to raise privileges");
2159
}
2160
2161
#ifdef __linux__
2162
int ret_linux;
2163
bool restore_loglevel = false;
2164
if(ret_errno == 0){
2165
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2166
messages about the network interface to mess up the prompt */
2167
ret_linux = klogctl(8, NULL, 5);
2168
if(ret_linux == -1){
2169
perror_plus("klogctl");
2170
} else {
2171
restore_loglevel = true;
2172
}
2173
}
2174
#endif /* __linux__ */
2175
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2176
ioctl_errno = errno;
2177
#ifdef __linux__
2178
if(restore_loglevel){
2179
ret_linux = klogctl(7, NULL, 0);
2180
if(ret_linux == -1){
2181
perror_plus("klogctl");
2182
}
2183
}
2184
#endif /* __linux__ */
2185
2186
/* If raise_privileges() succeeded above */
2187
if(ret_errno == 0){
2188
/* Lower privileges */
2189
ret_errno = lower_privileges();
2190
if(ret_errno != 0){
2191
errno = ret_errno;
2192
perror_plus("Failed to lower privileges");
2193
}
2194
}
2195
2196
/* Close the socket */
2197
ret = close(sd);
2198
if(ret == -1){
2199
perror_plus("close");
2200
}
2201
2202
if(ret_setflags == -1){
2203
errno = ioctl_errno;
2204
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2205
errno = old_errno;
2206
return ioctl_errno;
2207
}
2208
} else if(debug){
2209
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2210
interface);
2211
}
2212
2213
/* Sleep checking until interface is running.
2214
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
2216
if(interface_is_running(interface)){
2217
break;
2218
}
2219
struct timespec sleeptime = { .tv_nsec = 250000000 };
2220
ret = nanosleep(&sleeptime, NULL);
2221
if(ret == -1 and errno != EINTR){
2222
perror_plus("nanosleep");
2223
}
2224
}
2225
2226
errno = old_errno;
2227
return 0;
2228
}
2229
2230
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2233
struct ifreq network;
2234
unsigned int if_index = if_nametoindex(interface);
2235
if(if_index == 0){
2236
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2237
errno = old_errno;
2238
return ENXIO;
2239
}
2240
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2243
if(not get_flags(interface, &network) and debug){
2244
ret_errno = errno;
2245
fprintf_plus(stderr, "Failed to get flags for interface "
2246
"\"%s\"\n", interface);
2247
errno = old_errno;
2248
return ret_errno;
2249
}
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
2252
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2253
if(sd == -1){
2254
ret_errno = errno;
2255
perror_plus("socket");
2256
errno = old_errno;
2257
return ret_errno;
2258
}
2259
2260
if(debug){
2261
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2262
interface);
2263
}
2264
2265
/* Raise privileges */
2266
ret_errno = raise_privileges();
2267
if(ret_errno != 0){
2268
errno = ret_errno;
2269
perror_plus("Failed to raise privileges");
2270
}
2271
2272
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2273
ioctl_errno = errno;
2274
2275
/* If raise_privileges() succeeded above */
2276
if(ret_errno == 0){
2277
/* Lower privileges */
2278
ret_errno = lower_privileges();
2279
if(ret_errno != 0){
2280
errno = ret_errno;
2281
perror_plus("Failed to lower privileges");
2282
}
2283
}
2284
2285
/* Close the socket */
2286
int ret = close(sd);
2287
if(ret == -1){
2288
perror_plus("close");
2289
}
2290
2291
if(ret_setflags == -1){
2292
errno = ioctl_errno;
2293
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2294
errno = old_errno;
2295
return ioctl_errno;
2296
}
2297
} else if(debug){
2298
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2299
interface);
2300
}
2301
2302
errno = old_errno;
2303
return 0;
2304
}
2305
1275
2306
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1276
2312
AvahiSServiceBrowser *sb = NULL;
1277
int error;
2313
error_t ret_errno;
1278
2314
int ret;
1279
2315
intmax_t tmpmax;
1280
2316
char *tmp;
1281
2317
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1289
bool tempdir_created = false;
2318
char *interfaces_to_take_down = NULL;
2319
size_t interfaces_to_take_down_size = 0;
2320
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2321
char old_tempdir[] = "/tmp/mandosXXXXXX";
2322
char *tempdir = NULL;
1290
2323
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
2324
const char *seckey = PATHDIR "/" SECKEY;
1292
2325
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
char *interfaces_hooks = NULL;
1293
2328
1294
2329
bool gnutls_initialized = false;
1295
2330
bool gpgme_initialized = false;
1347
2382
.doc = "Bit length of the prime number used in the"
1348
2383
" Diffie-Hellman key exchange",
1349
2384
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
1350
2390
{ .name = "priority", .key = 130,
1351
2391
.arg = "STRING",
1352
2392
.doc = "GnuTLS priority string for the TLS handshake",
1357
2397
.group = 2 },
1358
2398
{ .name = "retry", .key = 132,
1359
2399
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
2400
.doc = "Retry interval used when denied by the Mandos server",
2401
.group = 2 },
2402
{ .name = "network-hook-dir", .key = 133,
2403
.arg = "DIR",
2404
.doc = "Directory where network hooks are located",
1361
2405
.group = 2 },
1362
2406
/*
1363
2407
* These reproduce what we would get without ARGP_NO_HELP
1382
2426
connect_to = arg;
1383
2427
break;
1384
2428
case 'i': /* --interface */
1385
interface = arg;
2429
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2430
arg, (int)',');
2431
if(ret_errno != 0){
2432
argp_error(state, "%s", strerror(ret_errno));
2433
}
1386
2434
break;
1387
2435
case 's': /* --seckey */
1388
2436
seckey = arg;
1399
2447
}
1400
2448
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1401
2449
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
1402
2453
case 130: /* --priority */
1403
2454
mc.priority = arg;
1404
2455
break;
1417
2468
argp_error(state, "Bad retry interval");
1418
2469
}
1419
2470
break;
2471
case 133: /* --network-hook-dir */
2472
hookdir = arg;
2473
break;
1420
2474
/*
1421
2475
* These reproduce what we would get without ARGP_NO_HELP
1422
2476
*/
1428
2482
argp_state_help(state, state->out_stream,
1429
2483
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
2484
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
2485
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
2486
exit(argp_err_exit_status);
1433
2487
break;
1434
2488
default:
1441
2495
.args_doc = "",
1442
2496
.doc = "Mandos client -- Get and decrypt"
1443
2497
" passwords from a Mandos server" };
1444
ret = argp_parse(&argp, argc, argv,
1445
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1446
switch(ret){
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
1447
2501
case 0:
1448
2502
break;
1449
2503
case ENOMEM:
1450
2504
default:
1451
errno = ret;
2505
errno = ret_errno;
1452
2506
perror_plus("argp_parse");
1453
2507
exitcode = EX_OSERR;
1454
2508
goto end;
1457
2511
goto end;
1458
2512
}
1459
2513
}
1460
2514
1461
2515
{
1462
2516
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
2517
<https://bugs.debian.org/633582> */
2518
2519
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2523
perror_plus("Failed to raise privileges");
2524
} else {
2525
struct stat st;
2526
2527
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2528
int seckey_fd = open(seckey, O_RDONLY);
2529
if(seckey_fd == -1){
2530
perror_plus("open");
2531
} else {
2532
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2533
if(ret == -1){
2534
perror_plus("fstat");
2535
} else {
2536
if(S_ISREG(st.st_mode)
2537
and st.st_uid == 0 and st.st_gid == 0){
2538
ret = fchown(seckey_fd, uid, gid);
2539
if(ret == -1){
2540
perror_plus("fchown");
2541
}
2542
}
2543
}
2544
close(seckey_fd);
2545
}
2546
}
2547
2548
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
int pubkey_fd = open(pubkey, O_RDONLY);
2550
if(pubkey_fd == -1){
2551
perror_plus("open");
2552
} else {
2553
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2554
if(ret == -1){
2555
perror_plus("fstat");
2556
} else {
2557
if(S_ISREG(st.st_mode)
2558
and st.st_uid == 0 and st.st_gid == 0){
2559
ret = fchown(pubkey_fd, uid, gid);
2560
if(ret == -1){
2561
perror_plus("fchown");
2562
}
2563
}
2564
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2591
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to lower privileges");
2596
}
2597
}
2598
}
2599
2600
/* Remove invalid interface names (except "none") */
2601
{
2602
char *interface = NULL;
2603
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2604
interface))){
2605
if(strcmp(interface, "none") != 0
2606
and if_nametoindex(interface) == 0){
2607
if(interface[0] != '\0'){
2608
fprintf_plus(stderr, "Not using nonexisting interface"
2609
" \"%s\"\n", interface);
2610
}
2611
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2612
interface = NULL;
2613
}
2614
}
2615
}
2616
2617
/* Run network hooks */
2618
{
2619
if(mc.interfaces != NULL){
2620
interfaces_hooks = malloc(mc.interfaces_size);
2621
if(interfaces_hooks == NULL){
2622
perror_plus("malloc");
2623
goto end;
2624
}
2625
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2626
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2627
}
2628
run_network_hooks("start", interfaces_hooks != NULL ?
2629
interfaces_hooks : "", delay);
1519
2630
}
1520
2631
1521
2632
if(not debug){
1522
2633
avahi_set_log_function(empty_log);
1523
2634
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
2635
1550
2636
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2637
from the signal handler */
1552
2638
/* Initialize the pseudo-RNG for Avahi */
1553
2639
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2640
simple_poll = avahi_simple_poll_new();
2641
if(simple_poll == NULL){
2642
fprintf_plus(stderr,
2643
"Avahi: Failed to create simple poll object.\n");
1557
2644
exitcode = EX_UNAVAILABLE;
1558
2645
goto end;
1559
2646
}
1621
2708
}
1622
2709
}
1623
2710
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
2711
/* If no interfaces were specified, make a list */
2712
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2714
/* Look for any good interfaces */
2715
ret = scandir(sys_class_net, &direntries, good_interface,
2716
alphasort);
2717
if(ret >= 1){
2718
/* Add all found interfaces to interfaces list */
2719
for(int i = 0; i < ret; ++i){
2720
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2721
direntries[i]->d_name);
2722
if(ret_errno != 0){
2723
errno = ret_errno;
2724
perror_plus("argz_add");
2725
free(direntries[i]);
2726
continue;
2727
}
2728
if(debug){
2729
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
direntries[i]->d_name);
2731
}
2732
free(direntries[i]);
2733
}
2734
free(direntries);
2735
} else {
2736
if(ret == 0){
2737
free(direntries);
2738
}
2739
fprintf_plus(stderr, "Could not find a network interface\n");
2740
exitcode = EXIT_FAILURE;
2741
goto end;
2742
}
2743
}
2744
2745
/* Bring up interfaces which are down, and remove any "none"s */
2746
{
2747
char *interface = NULL;
2748
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2749
interface))){
2750
/* If interface name is "none", stop bringing up interfaces.
2751
Also remove all instances of "none" from the list */
2752
if(strcmp(interface, "none") == 0){
2753
argz_delete(&mc.interfaces, &mc.interfaces_size,
2754
interface);
2755
interface = NULL;
2756
while((interface = argz_next(mc.interfaces,
2757
mc.interfaces_size, interface))){
2758
if(strcmp(interface, "none") == 0){
2759
argz_delete(&mc.interfaces, &mc.interfaces_size,
2760
interface);
2761
interface = NULL;
1709
2762
}
1710
2763
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
2764
break;
1729
2765
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
2766
bool interface_was_up = interface_is_up(interface);
2767
errno = bring_up_interface(interface, delay);
2768
if(not interface_was_up){
2769
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2772
} else {
2773
errno = argz_add(&interfaces_to_take_down,
2774
&interfaces_to_take_down_size,
2775
interface);
2776
if(errno != 0){
2777
perror_plus("argz_add");
2778
}
2779
}
2780
}
2781
}
2782
if(debug and (interfaces_to_take_down == NULL)){
2783
fprintf_plus(stderr, "No interfaces were brought up\n");
2784
}
2785
}
2786
2787
/* If we only got one interface, explicitly use only that one */
2788
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2789
if(debug){
2790
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2791
mc.interfaces);
2792
}
2793
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1767
2794
}
1768
2795
1769
2796
if(quit_now){
1770
2797
goto end;
1771
2798
}
1772
2799
1773
ret = init_gnutls_global(pubkey, seckey);
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1774
2801
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2802
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2803
exitcode = EX_UNAVAILABLE;
1777
2804
goto end;
1778
2805
} else {
1783
2810
goto end;
1784
2811
}
1785
2812
1786
if(mkdtemp(tempdir) == NULL){
2813
/* Try /run/tmp before /tmp */
2814
tempdir = mkdtemp(run_tempdir);
2815
if(tempdir == NULL and errno == ENOENT){
2816
if(debug){
2817
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2818
run_tempdir, old_tempdir);
2819
}
2820
tempdir = mkdtemp(old_tempdir);
2821
}
2822
if(tempdir == NULL){
1787
2823
perror_plus("mkdtemp");
1788
2824
goto end;
1789
2825
}
1790
tempdir_created = true;
1791
2826
1792
2827
if(quit_now){
1793
2828
goto end;
1794
2829
}
1795
2830
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2831
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2832
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2833
exitcode = EX_UNAVAILABLE;
1799
2834
goto end;
1800
2835
} else {
1809
2844
/* Connect directly, do not use Zeroconf */
1810
2845
/* (Mainly meant for debugging) */
1811
2846
char *address = strrchr(connect_to, ':');
2847
1812
2848
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2849
fprintf_plus(stderr, "No colon in address\n");
1814
2850
exitcode = EX_USAGE;
1815
2851
goto end;
1816
2852
}
1819
2855
goto end;
1820
2856
}
1821
2857
1822
uint16_t port;
2858
in_port_t port;
1823
2859
errno = 0;
1824
2860
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2861
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2862
or tmpmax != (in_port_t)tmpmax){
2863
fprintf_plus(stderr, "Bad port number\n");
1828
2864
exitcode = EX_USAGE;
1829
2865
goto end;
1830
2866
}
1831
2867
1832
2868
if(quit_now){
1833
2869
goto end;
1834
2870
}
1835
2871
1836
port = (uint16_t)tmpmax;
2872
port = (in_port_t)tmpmax;
1837
2873
*address = '\0';
1838
2874
/* Colon in address indicates IPv6 */
1839
2875
int af;
1855
2891
}
1856
2892
1857
2893
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
2894
ret = start_mandos_communication(address, port, if_index, af,
2895
&mc);
1859
2896
if(quit_now or ret == 0){
1860
2897
break;
1861
2898
}
1862
2899
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2900
fprintf_plus(stderr, "Retrying in %d seconds\n",
2901
(int)retry_interval);
1865
2902
}
1866
sleep((int)retry_interval);
2903
sleep((unsigned int)retry_interval);
1867
2904
}
1868
2905
1869
if (not quit_now){
2906
if(not quit_now){
1870
2907
exitcode = EXIT_SUCCESS;
1871
2908
}
1872
2909
1873
2910
goto end;
1874
2911
}
1875
2912
1887
2924
config.publish_domain = 0;
1888
2925
1889
2926
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
1893
2929
1894
2930
/* Free the Avahi configuration data */
1895
2931
avahi_server_config_free(&config);
1897
2933
1898
2934
/* Check if creating the Avahi server object succeeded */
1899
2935
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2936
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
1902
2938
exitcode = EX_UNAVAILABLE;
1903
2939
goto end;
1904
2940
}
1910
2946
/* Create the Avahi service browser */
1911
2947
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
2948
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
2949
NULL, 0, browse_callback,
2950
(void *)&mc);
1914
2951
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2952
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2953
avahi_strerror(avahi_server_errno(mc.server)));
1917
2954
exitcode = EX_UNAVAILABLE;
1918
2955
goto end;
1919
2956
}
1925
2962
/* Run the main loop */
1926
2963
1927
2964
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2965
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2966
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2967
2968
ret = avahi_loop_with_timeout(simple_poll,
2969
(int)(retry_interval * 1000), &mc);
1933
2970
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2971
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2972
(ret == 0) ? "successfully" : "with error");
1936
2973
}
1937
2974
1938
2975
end:
1939
2976
1940
2977
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
1942
2985
}
1943
2986
1944
2987
/* Cleanup things */
2988
free(mc.interfaces);
2989
1945
2990
if(sb != NULL)
1946
2991
avahi_s_service_browser_free(sb);
1947
2992
1948
2993
if(mc.server != NULL)
1949
2994
avahi_server_free(mc.server);
1950
2995
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2996
if(simple_poll != NULL)
2997
avahi_simple_poll_free(simple_poll);
1953
2998
1954
2999
if(gnutls_initialized){
1955
3000
gnutls_certificate_free_credentials(mc.cred);
1956
gnutls_global_deinit();
1957
3001
gnutls_dh_params_deinit(mc.dh_params);
1958
3002
}
1959
3003
1960
3004
if(gpgme_initialized){
1961
3005
gpgme_release(mc.ctx);
1962
3006
}
1963
3007
1964
3008
/* Cleans up the circular linked list of Mandos servers the client
1965
3009
has seen */
1966
3010
if(mc.current_server != NULL){
1967
3011
mc.current_server->prev->next = NULL;
1968
3012
while(mc.current_server != NULL){
1969
3013
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
1970
3022
free(mc.current_server);
1971
3023
mc.current_server = next;
1972
3024
}
1973
3025
}
1974
3026
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1992
}
1993
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2004
}
3027
/* Re-raise privileges */
3028
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to raise privileges");
3033
} else {
3034
3035
/* Run network hooks */
3036
run_network_hooks("stop", interfaces_hooks != NULL ?
3037
interfaces_hooks : "", delay);
3038
3039
/* Take down the network interfaces which were brought up */
3040
{
3041
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
3048
perror_plus("Failed to take down interface");
3049
}
3050
}
3051
if(debug and (interfaces_to_take_down == NULL)){
3052
fprintf_plus(stderr, "No interfaces needed to be taken"
3053
" down\n");
3054
}
3055
}
3056
}
3057
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3061
perror_plus("Failed to lower privileges permanently");
3062
}
3063
}
3064
3065
free(interfaces_to_take_down);
3066
free(interfaces_hooks);
3067
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
2005
3120
}
2006
3121
2007
3122
/* Removes the GPGME temp directory and all files inside */
2008
if(tempdir_created){
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
2016
char *fullname = NULL;
2017
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
direntry->d_name);
2019
if(ret < 0){
2020
perror_plus("asprintf");
2021
continue;
2022
}
2023
ret = remove(fullname);
2024
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2027
}
2028
free(fullname);
2029
}
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
2036
}
2037
ret = rmdir(tempdir);
2038
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
2040
}
3123
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2041
3125
}
2042
3126
2043
3127
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0