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- Committer: teddy at bsnet
- Date: 2010-09-13 06:19:45 UTC
- Revision ID: teddy@fukt.bsnet.se-20100913061945-y6qw52q01ptn7q71
* mandos-keygen: Don't use "echo -e".
- files removed:
- bugs.xml
- debian/source
- 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 © 2008-2018 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
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
31
30
*/
32
31
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
56
54
SOCK_STREAM, uid_t, gid_t, open(),
57
55
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
73
66
#include <time.h> /* nanosleep(), time(), sleep() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
68
SIOCSIFFLAGS, if_indextoname(),
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
92
84
raise() */
93
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
87
105
88
#ifdef __linux__
106
89
#include <sys/klog.h> /* klogctl() */
124
107
init_gnutls_session(),
125
108
GNUTLS_* */
126
109
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
129
112
130
113
/* GPGME */
131
114
#include <gpgme.h> /* All GPGME types, constants and
139
122
#define PATHDIR "/conf/conf.d/mandos"
140
123
#define SECKEY "seckey.txt"
141
124
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
125
144
126
bool debug = false;
145
127
static const char mandos_protocol_version[] = "1";
146
128
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
130
static const char sys_class_net[] = "/sys/class/net";
149
131
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
157
const char *ip;
158
in_port_t port;
159
AvahiIfIndex if_index;
160
int af;
161
struct timespec last_seen;
162
struct server *next;
163
struct server *prev;
164
} server;
165
132
166
133
/* Used for passing in values through the Avahi callback functions */
167
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
168
136
AvahiServer *server;
169
137
gnutls_certificate_credentials_t cred;
170
138
unsigned int dh_bits;
171
139
gnutls_dh_params_t dh_params;
172
140
const char *priority;
173
141
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
142
} mandos_context;
178
143
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
181
148
182
149
sig_atomic_t quit_now = 0;
183
150
int signal_received = 0;
184
151
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
187
int e = errno;
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
190
errno = e;
191
perror(print_text);
192
}
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
204
152
/*
205
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
154
* bytes. "buffer_capacity" is how much is currently allocated,
207
155
* "buffer_length" is how much is already used.
208
156
*/
209
__attribute__((nonnull, warn_unused_result))
210
157
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
158
size_t buffer_capacity){
212
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
219
162
return 0;
220
163
}
221
*buffer = new_buf;
222
164
buffer_capacity += BUFFER_SIZE;
223
165
}
224
166
return buffer_capacity;
225
167
}
226
168
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
231
int ret;
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
235
return false;
236
}
237
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
259
}
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
265
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
273
}
274
275
169
/*
276
170
* Initialize GPGME.
277
171
*/
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){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
283
174
gpgme_error_t rc;
284
175
gpgme_engine_info_t engine_info;
285
176
177
286
178
/*
287
179
* Helper function to insert pub and seckey to the engine keyring.
288
180
*/
289
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
290
182
int ret;
291
183
int fd;
292
184
gpgme_data_t pgp_data;
293
185
294
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
295
187
if(fd == -1){
296
perror_plus("open");
188
perror("open");
297
189
return false;
298
190
}
299
191
300
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
193
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
304
196
return false;
305
197
}
306
198
307
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
308
200
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
311
203
return false;
312
204
}
313
205
314
ret = close(fd);
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
207
if(ret == -1){
316
perror_plus("close");
208
perror("close");
317
209
}
318
210
gpgme_data_release(pgp_data);
319
211
return true;
320
212
}
321
213
322
214
if(debug){
323
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
324
216
}
325
217
326
218
/* Init GPGME */
327
219
gpgme_check_version(NULL);
328
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
329
221
if(rc != GPG_ERR_NO_ERROR){
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
332
224
return false;
333
225
}
334
226
335
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
336
228
rc = gpgme_get_engine_info(&engine_info);
337
229
if(rc != GPG_ERR_NO_ERROR){
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
340
232
return false;
341
233
}
342
234
while(engine_info != NULL){
348
240
engine_info = engine_info->next;
349
241
}
350
242
if(engine_info == NULL){
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
353
244
return false;
354
245
}
355
246
356
247
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
358
249
if(rc != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
362
252
return false;
363
253
}
364
254
373
263
* Decrypt OpenPGP data.
374
264
* Returns -1 on error
375
265
*/
376
__attribute__((nonnull, warn_unused_result))
377
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
267
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
268
char **plaintext){
381
269
gpgme_data_t dh_crypto, dh_plain;
382
270
gpgme_error_t rc;
383
271
ssize_t ret;
385
273
ssize_t plaintext_length = 0;
386
274
387
275
if(debug){
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
389
277
}
390
278
391
279
/* Create new GPGME data buffer from memory cryptotext */
392
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
393
281
0);
394
282
if(rc != GPG_ERR_NO_ERROR){
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
397
285
return -1;
398
286
}
399
287
400
288
/* Create new empty GPGME data buffer for the plaintext */
401
289
rc = gpgme_data_new(&dh_plain);
402
290
if(rc != GPG_ERR_NO_ERROR){
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
406
293
gpgme_data_release(dh_crypto);
407
294
return -1;
408
295
}
409
296
410
297
/* Decrypt data from the cryptotext data buffer to the plaintext
411
298
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
300
if(rc != GPG_ERR_NO_ERROR){
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
416
303
plaintext_length = -1;
417
304
if(debug){
418
305
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
420
307
if(result == NULL){
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
422
309
} else {
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
427
314
if(result->file_name != NULL){
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
429
316
}
430
317
gpgme_recipient_t recipient;
431
318
recipient = result->recipients;
432
319
while(recipient != NULL){
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
440
326
recipient = recipient->next;
441
327
}
442
328
}
445
331
}
446
332
447
333
if(debug){
448
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
449
335
}
450
336
451
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
452
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
453
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
454
340
plaintext_length = -1;
455
341
goto decrypt_end;
456
342
}
458
344
*plaintext = NULL;
459
345
while(true){
460
346
plaintext_capacity = incbuffer(plaintext,
461
(size_t)plaintext_length,
462
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
463
349
if(plaintext_capacity == 0){
464
perror_plus("incbuffer");
465
plaintext_length = -1;
466
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
467
353
}
468
354
469
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
474
360
break;
475
361
}
476
362
if(ret < 0){
477
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
478
364
plaintext_length = -1;
479
365
goto decrypt_end;
480
366
}
482
368
}
483
369
484
370
if(debug){
485
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
486
372
for(ssize_t i = 0; i < plaintext_length; i++){
487
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
488
374
}
499
385
return plaintext_length;
500
386
}
501
387
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);
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
392
ret = "(unknown)";
393
return ret;
513
394
}
514
395
515
396
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
397
static void debuggnutls(__attribute__((unused)) int level,
518
398
const char* string){
519
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
520
400
}
521
401
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
402
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
403
const char *seckeyfilename){
527
404
int ret;
528
unsigned int uret;
529
405
530
406
if(debug){
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
408
}
409
410
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
414
return -1;
532
415
}
533
416
534
417
if(debug){
540
423
}
541
424
542
425
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
544
427
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
547
434
return -1;
548
435
}
549
436
550
437
if(debug){
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
555
441
}
556
442
557
443
ret = gnutls_certificate_set_openpgp_key_file
558
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
559
445
GNUTLS_OPENPGP_FMT_BASE64);
560
446
if(ret != GNUTLS_E_SUCCESS){
561
fprintf_plus(stderr,
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
566
452
goto globalfail;
567
453
}
568
454
569
455
/* GnuTLS server initialization */
570
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
575
goto globalfail;
576
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
if(params.data == NULL){
617
dhparamsfilename = NULL;
618
}
619
if(dhparamsfilename == NULL){
620
break;
621
}
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
629
}
630
free(params.data);
631
} while(false);
632
}
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
do {
639
int secfile = open(seckeyfilename, O_RDONLY);
640
if(secfile == -1){
641
perror_plus("open");
642
break;
643
}
644
size_t buffer_capacity = 0;
645
while(true){
646
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer.size,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
651
free(buffer.data);
652
buffer.data = NULL;
653
break;
654
}
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
657
BUFFER_SIZE);
658
/* EOF */
659
if(bytes_read == 0){
660
break;
661
}
662
/* check bytes_read for failure */
663
if(bytes_read < 0){
664
perror_plus("read");
665
free(buffer.data);
666
buffer.data = NULL;
667
break;
668
}
669
buffer.size += (unsigned int)bytes_read;
670
}
671
close(secfile);
672
} while(false);
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
676
{
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
" structure: %s",
682
safer_gnutls_strerror(ret));
683
free(buffer.data);
684
buffer.data = NULL;
685
} else {
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
691
privkey = NULL;
692
}
693
free(buffer.data);
694
buffer.data = NULL;
695
if(privkey != NULL){
696
/* Use private key to suggest an appropriate
697
sec_param */
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
700
if(debug){
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
704
(sec_param)));
705
}
706
}
707
}
708
}
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
if(debug){
713
fprintf_plus(stderr, "Falling back to security parameter"
714
" \"%s\"\n",
715
safe_string(gnutls_sec_param_get_name
716
(sec_param)));
717
}
718
}
719
}
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
if(uret != 0){
722
mc->dh_bits = uret;
723
if(debug){
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
mc->dh_bits);
729
}
730
} else {
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
734
(sec_param)),
735
safer_gnutls_strerror(ret));
736
goto globalfail;
737
}
738
} else if(debug){
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
mc->dh_bits);
741
}
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
747
goto globalfail;
748
}
749
}
750
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
460
goto globalfail;
461
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
466
goto globalfail;
467
}
468
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
751
470
752
471
return 0;
753
472
754
473
globalfail:
755
474
756
gnutls_certificate_free_credentials(mc->cred);
757
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_certificate_free_credentials(mc.cred);
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
758
478
return -1;
759
479
}
760
480
761
__attribute__((nonnull, warn_unused_result))
762
static int init_gnutls_session(gnutls_session_t *session,
763
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
764
482
int ret;
765
483
/* GnuTLS session creation */
766
484
do {
770
488
}
771
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
772
490
if(ret != GNUTLS_E_SUCCESS){
773
fprintf_plus(stderr,
774
"Error in GnuTLS session initialization: %s\n",
775
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
776
493
}
777
494
778
495
{
779
496
const char *err;
780
497
do {
781
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
782
499
if(quit_now){
783
500
gnutls_deinit(*session);
784
501
return -1;
785
502
}
786
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
787
504
if(ret != GNUTLS_E_SUCCESS){
788
fprintf_plus(stderr, "Syntax error at: %s\n", err);
789
fprintf_plus(stderr, "GnuTLS error: %s\n",
790
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
791
508
gnutls_deinit(*session);
792
509
return -1;
793
510
}
795
512
796
513
do {
797
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
798
mc->cred);
515
mc.cred);
799
516
if(quit_now){
800
517
gnutls_deinit(*session);
801
518
return -1;
802
519
}
803
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
804
521
if(ret != GNUTLS_E_SUCCESS){
805
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
806
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
807
524
gnutls_deinit(*session);
808
525
return -1;
809
526
}
811
528
/* ignore client certificate if any. */
812
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
813
530
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
814
533
return 0;
815
534
}
816
535
818
537
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
819
538
__attribute__((unused)) const char *txt){}
820
539
821
/* Set effective uid to 0, return errno */
822
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
826
if(seteuid(0) == -1){
827
ret = errno;
828
}
829
errno = old_errno;
830
return ret;
831
}
832
833
/* Set effective and real user ID to 0. Return errno. */
834
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
839
errno = old_errno;
840
return ret;
841
}
842
if(setuid(0) == -1){
843
ret = errno;
844
}
845
errno = old_errno;
846
return ret;
847
}
848
849
/* Set effective user ID to unprivileged saved user ID */
850
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
854
if(seteuid(uid) == -1){
855
ret = errno;
856
}
857
errno = old_errno;
858
return ret;
859
}
860
861
/* Lower privileges permanently */
862
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
866
if(setuid(uid) == -1){
867
ret = errno;
868
}
869
errno = old_errno;
870
return ret;
871
}
872
873
/* Helper function to add_local_route() and delete_local_route() */
874
__attribute__((nonnull, warn_unused_result))
875
static bool add_delete_local_route(const bool add,
876
const char *address,
877
AvahiIfIndex if_index){
878
int ret;
879
char helper[] = "mandos-client-iprouteadddel";
880
char add_arg[] = "add";
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
884
if(pluginhelperdir == NULL){
885
if(debug){
886
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
887
" variable not set; cannot run helper\n");
888
}
889
return false;
890
}
891
892
char interface[IF_NAMESIZE];
893
if(if_indextoname((unsigned int)if_index, interface) == NULL){
894
perror_plus("if_indextoname");
895
return false;
896
}
897
898
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
if(devnull == -1){
900
perror_plus("open(\"/dev/null\", O_RDONLY)");
901
return false;
902
}
903
pid_t pid = fork();
904
if(pid == 0){
905
/* Child */
906
/* Raise privileges */
907
errno = raise_privileges_permanently();
908
if(errno != 0){
909
perror_plus("Failed to raise privileges");
910
/* _exit(EX_NOPERM); */
911
} else {
912
/* Set group */
913
errno = 0;
914
ret = setgid(0);
915
if(ret == -1){
916
perror_plus("setgid");
917
_exit(EX_NOPERM);
918
}
919
/* Reset supplementary groups */
920
errno = 0;
921
ret = setgroups(0, NULL);
922
if(ret == -1){
923
perror_plus("setgroups");
924
_exit(EX_NOPERM);
925
}
926
}
927
ret = dup2(devnull, STDIN_FILENO);
928
if(ret == -1){
929
perror_plus("dup2(devnull, STDIN_FILENO)");
930
_exit(EX_OSERR);
931
}
932
ret = close(devnull);
933
if(ret == -1){
934
perror_plus("close");
935
_exit(EX_OSERR);
936
}
937
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
if(ret == -1){
939
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
_exit(EX_OSERR);
941
}
942
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
943
O_RDONLY
944
| O_DIRECTORY
945
| O_PATH
946
| O_CLOEXEC));
947
if(helperdir_fd == -1){
948
perror_plus("open");
949
_exit(EX_UNAVAILABLE);
950
}
951
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
helper, O_RDONLY));
953
if(helper_fd == -1){
954
perror_plus("openat");
955
close(helperdir_fd);
956
_exit(EX_UNAVAILABLE);
957
}
958
close(helperdir_fd);
959
#ifdef __GNUC__
960
#pragma GCC diagnostic push
961
#pragma GCC diagnostic ignored "-Wcast-qual"
962
#endif
963
if(fexecve(helper_fd, (char *const [])
964
{ helper, add ? add_arg : delete_arg, (char *)address,
965
interface, debug ? debug_flag : NULL, NULL },
966
environ) == -1){
967
#ifdef __GNUC__
968
#pragma GCC diagnostic pop
969
#endif
970
perror_plus("fexecve");
971
_exit(EXIT_FAILURE);
972
}
973
}
974
if(pid == -1){
975
perror_plus("fork");
976
return false;
977
}
978
int status;
979
pid_t pret = -1;
980
errno = 0;
981
do {
982
pret = waitpid(pid, &status, 0);
983
if(pret == -1 and errno == EINTR and quit_now){
984
int errno_raising = 0;
985
if((errno = raise_privileges()) != 0){
986
errno_raising = errno;
987
perror_plus("Failed to raise privileges in order to"
988
" kill helper program");
989
}
990
if(kill(pid, SIGTERM) == -1){
991
perror_plus("kill");
992
}
993
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
994
perror_plus("Failed to lower privileges after killing"
995
" helper program");
996
}
997
return false;
998
}
999
} while(pret == -1 and errno == EINTR);
1000
if(pret == -1){
1001
perror_plus("waitpid");
1002
return false;
1003
}
1004
if(WIFEXITED(status)){
1005
if(WEXITSTATUS(status) != 0){
1006
fprintf_plus(stderr, "Error: iprouteadddel exited"
1007
" with status %d\n", WEXITSTATUS(status));
1008
return false;
1009
}
1010
return true;
1011
}
1012
if(WIFSIGNALED(status)){
1013
fprintf_plus(stderr, "Error: iprouteadddel died by"
1014
" signal %d\n", WTERMSIG(status));
1015
return false;
1016
}
1017
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
return false;
1019
}
1020
1021
__attribute__((nonnull, warn_unused_result))
1022
static bool add_local_route(const char *address,
1023
AvahiIfIndex if_index){
1024
if(debug){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
}
1027
return add_delete_local_route(true, address, if_index);
1028
}
1029
1030
__attribute__((nonnull, warn_unused_result))
1031
static bool delete_local_route(const char *address,
1032
AvahiIfIndex if_index){
1033
if(debug){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
}
1036
return add_delete_local_route(false, address, if_index);
1037
}
1038
1039
540
/* Called when a Mandos server is found */
1040
__attribute__((nonnull, warn_unused_result))
1041
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
1042
542
AvahiIfIndex if_index,
1043
int af, mandos_context *mc){
543
int af){
1044
544
int ret, tcp_sd = -1;
1045
545
ssize_t sret;
1046
struct sockaddr_storage to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
1047
550
char *buffer = NULL;
1048
551
char *decrypted_buffer = NULL;
1049
552
size_t buffer_length = 0;
1052
555
int retval = -1;
1053
556
gnutls_session_t session;
1054
557
int pf; /* Protocol family */
1055
bool route_added = false;
1056
558
1057
559
errno = 0;
1058
560
1069
571
pf = PF_INET;
1070
572
break;
1071
573
default:
1072
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
1073
575
errno = EINVAL;
1074
576
return -1;
1075
577
}
1076
578
1077
/* If the interface is specified and we have a list of interfaces */
1078
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1079
/* Check if the interface is one of the interfaces we are using */
1080
bool match = false;
1081
{
1082
char *interface = NULL;
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
1111
580
if(ret != 0){
1112
581
return -1;
1113
582
}
1114
583
1115
584
if(debug){
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
1118
587
}
1119
588
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
590
if(tcp_sd < 0){
1122
591
int e = errno;
1123
perror_plus("socket");
592
perror("socket");
1124
593
errno = e;
1125
594
goto mandos_end;
1126
595
}
1130
599
goto mandos_end;
1131
600
}
1132
601
602
memset(&to, 0, sizeof(to));
1133
603
if(af == AF_INET6){
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1137
606
} else { /* IPv4 */
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
1141
609
}
1142
610
if(ret < 0 ){
1143
611
int e = errno;
1144
perror_plus("inet_pton");
612
perror("inet_pton");
1145
613
errno = e;
1146
614
goto mandos_end;
1147
615
}
1148
616
if(ret == 0){
1149
617
int e = errno;
1150
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
1151
619
errno = e;
1152
620
goto mandos_end;
1153
621
}
1154
622
if(af == AF_INET6){
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
1158
630
if(if_index == AVAHI_IF_UNSPEC){
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
1161
633
errno = EINVAL;
1162
634
goto mandos_end;
1163
635
}
1164
636
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
637
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
638
}
1167
639
} else {
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
1169
643
}
1170
644
1171
645
if(quit_now){
1177
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1178
652
char interface[IF_NAMESIZE];
1179
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1180
perror_plus("if_indextoname");
654
perror("if_indextoname");
1181
655
} else {
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
1184
658
}
1185
659
} else {
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
1188
662
}
1189
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
679
}
680
}
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
1271
704
}
1272
705
1273
706
const char *out = mandos_protocol_version;
1275
708
while(true){
1276
709
size_t out_size = strlen(out);
1277
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1278
out_size - written));
711
out_size - written));
1279
712
if(ret == -1){
1280
713
int e = errno;
1281
perror_plus("write");
714
perror("write");
1282
715
errno = e;
1283
716
goto mandos_end;
1284
717
}
1301
734
}
1302
735
1303
736
if(debug){
1304
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1305
738
}
1306
739
1307
740
if(quit_now){
1309
742
goto mandos_end;
1310
743
}
1311
744
1312
/* This casting via intptr_t is to eliminate warning about casting
1313
an int to a pointer type. This is exactly how the GnuTLS Guile
1314
function "set-session-transport-fd!" does it. */
1315
gnutls_transport_set_ptr(session,
1316
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1317
746
1318
747
if(quit_now){
1319
748
errno = EINTR;
1330
759
1331
760
if(ret != GNUTLS_E_SUCCESS){
1332
761
if(debug){
1333
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1334
763
gnutls_perror(ret);
1335
764
}
1336
765
errno = EPROTO;
1340
769
/* Read OpenPGP packet that contains the wanted password */
1341
770
1342
771
if(debug){
1343
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1344
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
1345
774
}
1346
775
1347
776
while(true){
1352
781
}
1353
782
1354
783
buffer_capacity = incbuffer(&buffer, buffer_length,
1355
buffer_capacity);
784
buffer_capacity);
1356
785
if(buffer_capacity == 0){
1357
786
int e = errno;
1358
perror_plus("incbuffer");
787
perror("incbuffer");
1359
788
errno = e;
1360
789
goto mandos_end;
1361
790
}
1385
814
}
1386
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1387
816
if(ret < 0){
1388
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1389
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1390
818
gnutls_perror(ret);
1391
819
errno = EPROTO;
1392
820
goto mandos_end;
1393
821
}
1394
822
break;
1395
823
default:
1396
fprintf_plus(stderr, "Unknown error while reading data from"
1397
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
1398
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1399
827
errno = EIO;
1400
828
goto mandos_end;
1405
833
}
1406
834
1407
835
if(debug){
1408
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
1409
837
}
1410
838
1411
839
if(quit_now){
1423
851
1424
852
if(buffer_length > 0){
1425
853
ssize_t decrypted_buffer_size;
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
1428
857
if(decrypted_buffer_size >= 0){
1429
858
1430
clearerr(stdout);
1431
859
written = 0;
1432
860
while(written < (size_t) decrypted_buffer_size){
1433
861
if(quit_now){
1441
869
if(ret == 0 and ferror(stdout)){
1442
870
int e = errno;
1443
871
if(debug){
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
1446
874
}
1447
875
errno = e;
1448
876
goto mandos_end;
1449
877
}
1450
878
written += (size_t)ret;
1451
879
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
1462
880
retval = 0;
1463
881
}
1464
882
}
1467
885
1468
886
mandos_end:
1469
887
{
1470
if(route_added){
1471
if(not delete_local_route(ip, if_index)){
1472
fprintf_plus(stderr, "Failed to delete local route to %s on"
1473
" interface %d", ip, if_index);
1474
}
1475
}
1476
888
int e = errno;
1477
889
free(decrypted_buffer);
1478
890
free(buffer);
1479
891
if(tcp_sd >= 0){
1480
ret = close(tcp_sd);
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
893
}
1482
894
if(ret == -1){
1483
895
if(e == 0){
1484
896
e = errno;
1485
897
}
1486
perror_plus("close");
898
perror("close");
1487
899
}
1488
900
gnutls_deinit(session);
1489
errno = e;
1490
901
if(quit_now){
1491
errno = EINTR;
902
e = EINTR;
1492
903
retval = -1;
1493
904
}
905
errno = e;
1494
906
}
1495
907
return retval;
1496
908
}
1508
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
1509
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1510
922
flags,
1511
void *mc){
1512
if(r == NULL){
1513
return;
1514
}
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1515
925
1516
926
/* Called whenever a service has been resolved successfully or
1517
927
timed out */
1518
928
1519
929
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1521
930
return;
1522
931
}
1523
932
1524
933
switch(event){
1525
934
default:
1526
935
case AVAHI_RESOLVER_FAILURE:
1527
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1528
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1529
domain,
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1532
939
break;
1533
940
1534
941
case AVAHI_RESOLVER_FOUND:
1536
943
char ip[AVAHI_ADDRESS_STR_MAX];
1537
944
avahi_address_snprint(ip, sizeof(ip), address);
1538
945
if(debug){
1539
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1540
PRIdMAX ") on port %" PRIu16 "\n", name,
1541
host_name, ip, (intmax_t)interface, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1542
949
}
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1547
952
if(ret == 0){
1548
avahi_simple_poll_quit(simple_poll);
1549
} else {
1550
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1553
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1554
" list\n", name);
1555
}
953
avahi_simple_poll_quit(mc.simple_poll);
1556
954
}
1557
955
}
1558
956
}
1568
966
const char *domain,
1569
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1570
968
flags,
1571
void *mc){
1572
if(b == NULL){
1573
return;
1574
}
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1575
971
1576
972
/* Called whenever a new services becomes available on the LAN or
1577
973
is removed from the LAN */
1584
980
default:
1585
981
case AVAHI_BROWSER_FAILURE:
1586
982
1587
fprintf_plus(stderr, "(Avahi browser) %s\n",
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1590
avahi_simple_poll_quit(simple_poll);
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1591
986
return;
1592
987
1593
988
case AVAHI_BROWSER_NEW:
1596
991
the callback function is called the Avahi server will free the
1597
992
resolver for us. */
1598
993
1599
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1600
interface, protocol, name, type,
1601
domain, protocol, 0,
1602
resolve_callback, mc) == NULL)
1603
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1604
" %s\n", name,
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1607
999
break;
1608
1000
1609
1001
case AVAHI_BROWSER_REMOVE:
1612
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1613
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1614
1006
if(debug){
1615
fprintf_plus(stderr, "No Mandos server found, still"
1616
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1617
1008
}
1618
1009
break;
1619
1010
}
1620
1011
}
1621
1012
1622
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1623
1014
static void handle_sigterm(int sig){
1624
1015
if(quit_now){
1625
1016
return;
1627
1018
quit_now = 1;
1628
1019
signal_received = sig;
1629
1020
int old_errno = errno;
1630
/* set main loop to exit */
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1633
1023
}
1634
1024
errno = old_errno;
1635
1025
}
1636
1026
1637
__attribute__((nonnull, warn_unused_result))
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
int ret;
1640
int old_errno;
1641
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(s < 0){
1644
old_errno = errno;
1645
perror_plus("socket");
1646
errno = old_errno;
1647
return false;
1648
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
if(ret == -1){
1653
if(debug){
1654
old_errno = errno;
1655
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1657
}
1658
return false;
1659
}
1660
return true;
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1665
1666
/* Reject the loopback device */
1667
if(ifr->ifr_flags & IFF_LOOPBACK){
1668
if(debug){
1669
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1670
ifname);
1671
}
1672
return false;
1673
}
1674
/* Accept point-to-point devices only if connect_to is specified */
1675
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1676
if(debug){
1677
fprintf_plus(stderr, "Accepting point-to-point interface"
1678
" \"%s\"\n", ifname);
1679
}
1680
return true;
1681
}
1682
/* Otherwise, reject non-broadcast-capable devices */
1683
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1684
if(debug){
1685
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1686
" \"%s\"\n", ifname);
1687
}
1688
return false;
1689
}
1690
/* Reject non-ARP interfaces (including dummy interfaces) */
1691
if(ifr->ifr_flags & IFF_NOARP){
1692
if(debug){
1693
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1694
ifname);
1695
}
1696
return false;
1697
}
1698
1699
/* Accept this device */
1700
if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1702
}
1703
return true;
1704
}
1705
1706
1027
/*
1707
1028
* This function determines if a directory entry in /sys/class/net
1708
1029
* corresponds to an acceptable network device.
1709
1030
* (This function is passed to scandir(3) as a filter function.)
1710
1031
*/
1711
__attribute__((nonnull, warn_unused_result))
1712
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1713
1041
if(if_entry->d_name[0] == '.'){
1714
1042
return 0;
1715
1043
}
1716
1717
struct ifreq ifr;
1718
if(not get_flags(if_entry->d_name, &ifr)){
1719
if(debug){
1720
fprintf_plus(stderr, "Failed to get flags for interface "
1721
"\"%s\"\n", if_entry->d_name);
1722
}
1723
return 0;
1724
}
1725
1726
if(not good_flags(if_entry->d_name, &ifr)){
1727
return 0;
1728
}
1729
return 1;
1730
}
1731
1732
/*
1733
* This function determines if a network interface is up.
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1737
struct ifreq ifr;
1738
if(not get_flags(interface, &ifr)){
1739
if(debug){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
}
1743
return false;
1744
}
1745
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1747
}
1748
1749
/*
1750
* This function determines if a network interface is running
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1754
struct ifreq ifr;
1755
if(not get_flags(interface, &ifr)){
1756
if(debug){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1759
}
1760
return false;
1761
}
1762
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
}
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1767
int notdotentries(const struct dirent *direntry){
1768
/* Skip "." and ".." */
1769
if(direntry->d_name[0] == '.'
1770
and (direntry->d_name[1] == '\0'
1771
or (direntry->d_name[1] == '.'
1772
and direntry->d_name[2] == '\0'))){
1773
return 0;
1774
}
1775
return 1;
1776
}
1777
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1780
int runnable_hook(const struct dirent *direntry){
1781
int ret;
1782
size_t sret;
1783
struct stat st;
1784
1785
if((direntry->d_name)[0] == '\0'){
1786
/* Empty name? */
1787
return 0;
1788
}
1789
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
"abcdefghijklmnopqrstuvwxyz"
1792
"0123456789"
1793
"_.-");
1794
if((direntry->d_name)[sret] != '\0'){
1795
/* Contains non-allowed characters */
1796
if(debug){
1797
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1798
direntry->d_name);
1799
}
1800
return 0;
1801
}
1802
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1804
if(ret == -1){
1805
if(debug){
1806
perror_plus("Could not stat hook");
1807
}
1808
return 0;
1809
}
1810
if(not (S_ISREG(st.st_mode))){
1811
/* Not a regular file */
1812
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1814
direntry->d_name);
1815
}
1816
return 0;
1817
}
1818
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1819
/* Not executable */
1820
if(debug){
1821
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1822
direntry->d_name);
1823
}
1824
return 0;
1825
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1826
1115
if(debug){
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1828
direntry->d_name);
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1829
1118
}
1830
1119
return 1;
1831
1120
}
1832
1121
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1836
int ret;
1837
struct timespec now;
1838
struct timespec waited_time;
1839
intmax_t block_time;
1840
1841
while(true){
1842
if(mc->current_server == NULL){
1843
if(debug){
1844
fprintf_plus(stderr, "Wait until first server is found."
1845
" No timeout!\n");
1846
}
1847
ret = avahi_simple_poll_iterate(s, -1);
1848
} else {
1849
if(debug){
1850
fprintf_plus(stderr, "Check current_server if we should run"
1851
" it, or wait\n");
1852
}
1853
/* the current time */
1854
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1855
if(ret == -1){
1856
perror_plus("clock_gettime");
1857
return -1;
1858
}
1859
/* Calculating in ms how long time between now and server
1860
who we visted longest time ago. Now - last seen. */
1861
waited_time.tv_sec = (now.tv_sec
1862
- mc->current_server->last_seen.tv_sec);
1863
waited_time.tv_nsec = (now.tv_nsec
1864
- mc->current_server->last_seen.tv_nsec);
1865
/* total time is 10s/10,000ms.
1866
Converting to s from ms by dividing by 1,000,
1867
and ns to ms by dividing by 1,000,000. */
1868
block_time = ((retry_interval
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1871
1872
if(debug){
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
block_time);
1875
}
1876
1877
if(block_time <= 0){
1878
ret = start_mandos_communication(mc->current_server->ip,
1879
mc->current_server->port,
1880
mc->current_server->if_index,
1881
mc->current_server->af, mc);
1882
if(ret == 0){
1883
avahi_simple_poll_quit(s);
1884
return 0;
1885
}
1886
ret = clock_gettime(CLOCK_MONOTONIC,
1887
&mc->current_server->last_seen);
1888
if(ret == -1){
1889
perror_plus("clock_gettime");
1890
return -1;
1891
}
1892
mc->current_server = mc->current_server->next;
1893
block_time = 0; /* Call avahi to find new Mandos
1894
servers, but don't block */
1895
}
1896
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1898
}
1899
if(ret != 0){
1900
if(ret > 0 or errno != EINTR){
1901
return (ret != 1) ? ret : 0;
1902
}
1903
}
1904
}
1905
}
1906
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1909
const float delay){
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1927
if(devnull == -1){
1928
perror_plus("open(\"/dev/null\", O_RDONLY)");
1929
return;
1930
}
1931
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1932
runnable_hook, alphasort);
1933
if(numhooks == -1){
1934
perror_plus("scandir");
1935
close(devnull);
1936
return;
1937
}
1938
struct dirent *direntry;
1939
int ret;
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1942
if(debug){
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
direntry->d_name);
1945
}
1946
pid_t hook_pid = fork();
1947
if(hook_pid == 0){
1948
/* Child */
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1951
if(errno != 0){
1952
perror_plus("Failed to raise privileges");
1953
_exit(EX_NOPERM);
1954
}
1955
/* Set group */
1956
errno = 0;
1957
ret = setgid(0);
1958
if(ret == -1){
1959
perror_plus("setgid");
1960
_exit(EX_NOPERM);
1961
}
1962
/* Reset supplementary groups */
1963
errno = 0;
1964
ret = setgroups(0, NULL);
1965
if(ret == -1){
1966
perror_plus("setgroups");
1967
_exit(EX_NOPERM);
1968
}
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("DEVICE", interface, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
if(ret == -1){
1981
perror_plus("setenv");
1982
_exit(EX_OSERR);
1983
}
1984
ret = setenv("MODE", mode, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
char *delaystring;
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1991
if(ret == -1){
1992
perror_plus("asprintf");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1997
free(delaystring);
1998
perror_plus("setenv");
1999
_exit(EX_OSERR);
2000
}
2001
free(delaystring);
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2004
if(ret == -1){
2005
perror_plus("setenv");
2006
_exit(EX_OSERR);
2007
}
2008
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
2012
if(hook_fd == -1){
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2015
}
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2019
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
environ) == -1){
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2039
}
2040
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
int status;
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2049
free(direntry);
2050
continue;
2051
}
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2057
free(direntry);
2058
continue;
2059
}
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2063
WTERMSIG(status));
2064
free(direntry);
2065
continue;
2066
} else {
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
continue;
2071
}
2072
}
2073
if(debug){
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
direntry->d_name);
2076
}
2077
free(direntry);
2078
}
2079
free(direntries);
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2082
} else {
2083
hookdir_fd = -1;
2084
}
2085
close(devnull);
2086
}
2087
2088
__attribute__((nonnull, warn_unused_result))
2089
int bring_up_interface(const char *const interface,
2090
const float delay){
2091
int old_errno = errno;
2092
int ret;
2093
struct ifreq network;
2094
unsigned int if_index = if_nametoindex(interface);
2095
if(if_index == 0){
2096
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2097
errno = old_errno;
2098
return ENXIO;
2099
}
2100
2101
if(quit_now){
2102
errno = old_errno;
2103
return EINTR;
2104
}
2105
2106
if(not interface_is_up(interface)){
2107
int ret_errno = 0;
2108
int ioctl_errno = 0;
2109
if(not get_flags(interface, &network)){
2110
ret_errno = errno;
2111
fprintf_plus(stderr, "Failed to get flags for interface "
2112
"\"%s\"\n", interface);
2113
errno = old_errno;
2114
return ret_errno;
2115
}
2116
network.ifr_flags |= IFF_UP; /* set flag */
2117
2118
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2119
if(sd == -1){
2120
ret_errno = errno;
2121
perror_plus("socket");
2122
errno = old_errno;
2123
return ret_errno;
2124
}
2125
2126
if(quit_now){
2127
ret = close(sd);
2128
if(ret == -1){
2129
perror_plus("close");
2130
}
2131
errno = old_errno;
2132
return EINTR;
2133
}
2134
2135
if(debug){
2136
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2137
interface);
2138
}
2139
2140
/* Raise privileges */
2141
ret_errno = raise_privileges();
2142
if(ret_errno != 0){
2143
errno = ret_errno;
2144
perror_plus("Failed to raise privileges");
2145
}
2146
2147
#ifdef __linux__
2148
int ret_linux;
2149
bool restore_loglevel = false;
2150
if(ret_errno == 0){
2151
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2152
messages about the network interface to mess up the prompt */
2153
ret_linux = klogctl(8, NULL, 5);
2154
if(ret_linux == -1){
2155
perror_plus("klogctl");
2156
} else {
2157
restore_loglevel = true;
2158
}
2159
}
2160
#endif /* __linux__ */
2161
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2162
ioctl_errno = errno;
2163
#ifdef __linux__
2164
if(restore_loglevel){
2165
ret_linux = klogctl(7, NULL, 0);
2166
if(ret_linux == -1){
2167
perror_plus("klogctl");
2168
}
2169
}
2170
#endif /* __linux__ */
2171
2172
/* If raise_privileges() succeeded above */
2173
if(ret_errno == 0){
2174
/* Lower privileges */
2175
ret_errno = lower_privileges();
2176
if(ret_errno != 0){
2177
errno = ret_errno;
2178
perror_plus("Failed to lower privileges");
2179
}
2180
}
2181
2182
/* Close the socket */
2183
ret = close(sd);
2184
if(ret == -1){
2185
perror_plus("close");
2186
}
2187
2188
if(ret_setflags == -1){
2189
errno = ioctl_errno;
2190
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2191
errno = old_errno;
2192
return ioctl_errno;
2193
}
2194
} else if(debug){
2195
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2196
interface);
2197
}
2198
2199
/* Sleep checking until interface is running.
2200
Check every 0.25s, up to total time of delay */
2201
for(int i = 0; i < delay * 4; i++){
2202
if(interface_is_running(interface)){
2203
break;
2204
}
2205
struct timespec sleeptime = { .tv_nsec = 250000000 };
2206
ret = nanosleep(&sleeptime, NULL);
2207
if(ret == -1 and errno != EINTR){
2208
perror_plus("nanosleep");
2209
}
2210
}
2211
2212
errno = old_errno;
2213
return 0;
2214
}
2215
2216
__attribute__((nonnull, warn_unused_result))
2217
int take_down_interface(const char *const interface){
2218
int old_errno = errno;
2219
struct ifreq network;
2220
unsigned int if_index = if_nametoindex(interface);
2221
if(if_index == 0){
2222
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2223
errno = old_errno;
2224
return ENXIO;
2225
}
2226
if(interface_is_up(interface)){
2227
int ret_errno = 0;
2228
int ioctl_errno = 0;
2229
if(not get_flags(interface, &network) and debug){
2230
ret_errno = errno;
2231
fprintf_plus(stderr, "Failed to get flags for interface "
2232
"\"%s\"\n", interface);
2233
errno = old_errno;
2234
return ret_errno;
2235
}
2236
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2237
2238
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2239
if(sd == -1){
2240
ret_errno = errno;
2241
perror_plus("socket");
2242
errno = old_errno;
2243
return ret_errno;
2244
}
2245
2246
if(debug){
2247
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2248
interface);
2249
}
2250
2251
/* Raise privileges */
2252
ret_errno = raise_privileges();
2253
if(ret_errno != 0){
2254
errno = ret_errno;
2255
perror_plus("Failed to raise privileges");
2256
}
2257
2258
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2259
ioctl_errno = errno;
2260
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
2270
2271
/* Close the socket */
2272
int ret = close(sd);
2273
if(ret == -1){
2274
perror_plus("close");
2275
}
2276
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2280
errno = old_errno;
2281
return ioctl_errno;
2282
}
2283
} else if(debug){
2284
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2285
interface);
2286
}
2287
2288
errno = old_errno;
2289
return 0;
2290
}
2291
2292
1122
int main(int argc, char *argv[]){
2293
mandos_context mc = { .server = NULL, .dh_bits = 0,
2294
.priority = "SECURE256:!CTYPE-X.509"
2295
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2296
.current_server = NULL, .interfaces = NULL,
2297
.interfaces_size = 0 };
2298
1123
AvahiSServiceBrowser *sb = NULL;
2299
error_t ret_errno;
1124
int error;
2300
1125
int ret;
2301
1126
intmax_t tmpmax;
2302
1127
char *tmp;
2303
1128
int exitcode = EXIT_SUCCESS;
2304
char *interfaces_to_take_down = NULL;
2305
size_t interfaces_to_take_down_size = 0;
2306
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2307
char old_tempdir[] = "/tmp/mandosXXXXXX";
2308
char *tempdir = NULL;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1136
bool tempdir_created = false;
2309
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2310
1138
const char *seckey = PATHDIR "/" SECKEY;
2311
1139
const char *pubkey = PATHDIR "/" PUBKEY;
2312
const char *dh_params_file = NULL;
2313
char *interfaces_hooks = NULL;
2314
1140
2315
1141
bool gnutls_initialized = false;
2316
1142
bool gpgme_initialized = false;
2317
1143
float delay = 2.5f;
2318
double retry_interval = 10; /* 10s between trying a server and
2319
retrying the same server again */
2320
1144
2321
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2322
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2328
1152
errno = 0;
2329
1153
ret = setgid(gid);
2330
1154
if(ret == -1){
2331
perror_plus("setgid");
1155
perror("setgid");
2332
1156
}
2333
1157
2334
1158
/* Lower user privileges (temporarily) */
2335
1159
errno = 0;
2336
1160
ret = seteuid(uid);
2337
1161
if(ret == -1){
2338
perror_plus("seteuid");
1162
perror("seteuid");
2339
1163
}
2340
1164
2341
1165
if(quit_now){
2368
1192
.doc = "Bit length of the prime number used in the"
2369
1193
" Diffie-Hellman key exchange",
2370
1194
.group = 2 },
2371
{ .name = "dh-params", .key = 134,
2372
.arg = "FILE",
2373
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2374
" for the Diffie-Hellman key exchange",
2375
.group = 2 },
2376
1195
{ .name = "priority", .key = 130,
2377
1196
.arg = "STRING",
2378
1197
.doc = "GnuTLS priority string for the TLS handshake",
2381
1200
.arg = "SECONDS",
2382
1201
.doc = "Maximum delay to wait for interface startup",
2383
1202
.group = 2 },
2384
{ .name = "retry", .key = 132,
2385
.arg = "SECONDS",
2386
.doc = "Retry interval used when denied by the Mandos server",
2387
.group = 2 },
2388
{ .name = "network-hook-dir", .key = 133,
2389
.arg = "DIR",
2390
.doc = "Directory where network hooks are located",
2391
.group = 2 },
2392
1203
/*
2393
1204
* These reproduce what we would get without ARGP_NO_HELP
2394
1205
*/
2412
1223
connect_to = arg;
2413
1224
break;
2414
1225
case 'i': /* --interface */
2415
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2416
arg, (int)',');
2417
if(ret_errno != 0){
2418
argp_error(state, "%s", strerror(ret_errno));
2419
}
1226
interface = arg;
2420
1227
break;
2421
1228
case 's': /* --seckey */
2422
1229
seckey = arg;
2433
1240
}
2434
1241
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2435
1242
break;
2436
case 134: /* --dh-params */
2437
dh_params_file = arg;
2438
break;
2439
1243
case 130: /* --priority */
2440
1244
mc.priority = arg;
2441
1245
break;
2445
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
2446
1250
argp_error(state, "Bad delay");
2447
1251
}
2448
case 132: /* --retry */
2449
errno = 0;
2450
retry_interval = strtod(arg, &tmp);
2451
if(errno != 0 or tmp == arg or *tmp != '\0'
2452
or (retry_interval * 1000) > INT_MAX
2453
or retry_interval < 0){
2454
argp_error(state, "Bad retry interval");
2455
}
2456
break;
2457
case 133: /* --network-hook-dir */
2458
hookdir = arg;
2459
1252
break;
2460
1253
/*
2461
1254
* These reproduce what we would get without ARGP_NO_HELP
2468
1261
argp_state_help(state, state->out_stream,
2469
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2470
1263
case 'V': /* --version */
2471
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
2472
1265
exit(argp_err_exit_status);
2473
1266
break;
2474
1267
default:
2481
1274
.args_doc = "",
2482
1275
.doc = "Mandos client -- Get and decrypt"
2483
1276
" passwords from a Mandos server" };
2484
ret_errno = argp_parse(&argp, argc, argv,
2485
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2486
switch(ret_errno){
1277
ret = argp_parse(&argp, argc, argv,
1278
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1279
switch(ret){
2487
1280
case 0:
2488
1281
break;
2489
1282
case ENOMEM:
2490
1283
default:
2491
errno = ret_errno;
2492
perror_plus("argp_parse");
1284
errno = ret;
1285
perror("argp_parse");
2493
1286
exitcode = EX_OSERR;
2494
1287
goto end;
2495
1288
case EINVAL:
2498
1291
}
2499
1292
}
2500
1293
2501
{
2502
/* Work around Debian bug #633582:
2503
<https://bugs.debian.org/633582> */
2504
2505
/* Re-raise privileges */
2506
ret = raise_privileges();
2507
if(ret != 0){
2508
errno = ret;
2509
perror_plus("Failed to raise privileges");
2510
} else {
2511
struct stat st;
2512
2513
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2514
int seckey_fd = open(seckey, O_RDONLY);
2515
if(seckey_fd == -1){
2516
perror_plus("open");
2517
} else {
2518
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2519
if(ret == -1){
2520
perror_plus("fstat");
2521
} else {
2522
if(S_ISREG(st.st_mode)
2523
and st.st_uid == 0 and st.st_gid == 0){
2524
ret = fchown(seckey_fd, uid, gid);
2525
if(ret == -1){
2526
perror_plus("fchown");
2527
}
2528
}
2529
}
2530
close(seckey_fd);
2531
}
2532
}
2533
2534
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2535
int pubkey_fd = open(pubkey, O_RDONLY);
2536
if(pubkey_fd == -1){
2537
perror_plus("open");
2538
} else {
2539
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2540
if(ret == -1){
2541
perror_plus("fstat");
2542
} else {
2543
if(S_ISREG(st.st_mode)
2544
and st.st_uid == 0 and st.st_gid == 0){
2545
ret = fchown(pubkey_fd, uid, gid);
2546
if(ret == -1){
2547
perror_plus("fchown");
2548
}
2549
}
2550
}
2551
close(pubkey_fd);
2552
}
2553
}
2554
2555
if(dh_params_file != NULL
2556
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2557
int dhparams_fd = open(dh_params_file, O_RDONLY);
2558
if(dhparams_fd == -1){
2559
perror_plus("open");
2560
} else {
2561
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2562
if(ret == -1){
2563
perror_plus("fstat");
2564
} else {
2565
if(S_ISREG(st.st_mode)
2566
and st.st_uid == 0 and st.st_gid == 0){
2567
ret = fchown(dhparams_fd, uid, gid);
2568
if(ret == -1){
2569
perror_plus("fchown");
2570
}
2571
}
2572
}
2573
close(dhparams_fd);
2574
}
2575
}
2576
2577
/* Lower privileges */
2578
ret = lower_privileges();
2579
if(ret != 0){
2580
errno = ret;
2581
perror_plus("Failed to lower privileges");
2582
}
2583
}
2584
}
2585
2586
/* Remove invalid interface names (except "none") */
2587
{
2588
char *interface = NULL;
2589
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2590
interface))){
2591
if(strcmp(interface, "none") != 0
2592
and if_nametoindex(interface) == 0){
2593
if(interface[0] != '\0'){
2594
fprintf_plus(stderr, "Not using nonexisting interface"
2595
" \"%s\"\n", interface);
2596
}
2597
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2598
interface = NULL;
2599
}
2600
}
2601
}
2602
2603
/* Run network hooks */
2604
{
2605
if(mc.interfaces != NULL){
2606
interfaces_hooks = malloc(mc.interfaces_size);
2607
if(interfaces_hooks == NULL){
2608
perror_plus("malloc");
2609
goto end;
2610
}
2611
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2612
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2613
}
2614
run_network_hooks("start", interfaces_hooks != NULL ?
2615
interfaces_hooks : "", delay);
2616
}
2617
2618
1294
if(not debug){
2619
1295
avahi_set_log_function(empty_log);
2620
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
2621
1322
2622
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2623
1324
from the signal handler */
2624
1325
/* Initialize the pseudo-RNG for Avahi */
2625
1326
srand((unsigned int) time(NULL));
2626
simple_poll = avahi_simple_poll_new();
2627
if(simple_poll == NULL){
2628
fprintf_plus(stderr,
2629
"Avahi: Failed to create simple poll object.\n");
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2630
1330
exitcode = EX_UNAVAILABLE;
2631
1331
goto end;
2632
1332
}
2634
1334
sigemptyset(&sigterm_action.sa_mask);
2635
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2636
1336
if(ret == -1){
2637
perror_plus("sigaddset");
1337
perror("sigaddset");
2638
1338
exitcode = EX_OSERR;
2639
1339
goto end;
2640
1340
}
2641
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2642
1342
if(ret == -1){
2643
perror_plus("sigaddset");
1343
perror("sigaddset");
2644
1344
exitcode = EX_OSERR;
2645
1345
goto end;
2646
1346
}
2647
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2648
1348
if(ret == -1){
2649
perror_plus("sigaddset");
1349
perror("sigaddset");
2650
1350
exitcode = EX_OSERR;
2651
1351
goto end;
2652
1352
}
2656
1356
*/
2657
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2658
1358
if(ret == -1){
2659
perror_plus("sigaction");
1359
perror("sigaction");
2660
1360
return EX_OSERR;
2661
1361
}
2662
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
2663
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
2664
1364
if(ret == -1){
2665
perror_plus("sigaction");
1365
perror("sigaction");
2666
1366
exitcode = EX_OSERR;
2667
1367
goto end;
2668
1368
}
2669
1369
}
2670
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2671
1371
if(ret == -1){
2672
perror_plus("sigaction");
1372
perror("sigaction");
2673
1373
return EX_OSERR;
2674
1374
}
2675
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
2676
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2677
1377
if(ret == -1){
2678
perror_plus("sigaction");
1378
perror("sigaction");
2679
1379
exitcode = EX_OSERR;
2680
1380
goto end;
2681
1381
}
2682
1382
}
2683
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2684
1384
if(ret == -1){
2685
perror_plus("sigaction");
1385
perror("sigaction");
2686
1386
return EX_OSERR;
2687
1387
}
2688
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
2689
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2690
1390
if(ret == -1){
2691
perror_plus("sigaction");
1391
perror("sigaction");
2692
1392
exitcode = EX_OSERR;
2693
1393
goto end;
2694
1394
}
2695
1395
}
2696
1396
2697
/* If no interfaces were specified, make a list */
2698
if(mc.interfaces == NULL){
2699
struct dirent **direntries = NULL;
2700
/* Look for any good interfaces */
2701
ret = scandir(sys_class_net, &direntries, good_interface,
2702
alphasort);
2703
if(ret >= 1){
2704
/* Add all found interfaces to interfaces list */
2705
for(int i = 0; i < ret; ++i){
2706
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2707
direntries[i]->d_name);
2708
if(ret_errno != 0){
2709
errno = ret_errno;
2710
perror_plus("argz_add");
2711
free(direntries[i]);
2712
continue;
2713
}
2714
if(debug){
2715
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2716
direntries[i]->d_name);
2717
}
2718
free(direntries[i]);
2719
}
2720
free(direntries);
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
1482
}
1483
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
break;
1501
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
2721
1532
} else {
2722
if(ret == 0){
2723
free(direntries);
2724
}
2725
fprintf_plus(stderr, "Could not find a network interface\n");
2726
exitcode = EXIT_FAILURE;
2727
goto end;
2728
}
2729
}
2730
2731
/* Bring up interfaces which are down, and remove any "none"s */
2732
{
2733
char *interface = NULL;
2734
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2735
interface))){
2736
/* If interface name is "none", stop bringing up interfaces.
2737
Also remove all instances of "none" from the list */
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
interface);
2741
interface = NULL;
2742
while((interface = argz_next(mc.interfaces,
2743
mc.interfaces_size, interface))){
2744
if(strcmp(interface, "none") == 0){
2745
argz_delete(&mc.interfaces, &mc.interfaces_size,
2746
interface);
2747
interface = NULL;
2748
}
2749
}
2750
break;
2751
}
2752
bool interface_was_up = interface_is_up(interface);
2753
errno = bring_up_interface(interface, delay);
2754
if(not interface_was_up){
2755
if(errno != 0){
2756
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2757
" %s\n", interface, strerror(errno));
2758
} else {
2759
errno = argz_add(&interfaces_to_take_down,
2760
&interfaces_to_take_down_size,
2761
interface);
2762
if(errno != 0){
2763
perror_plus("argz_add");
2764
}
2765
}
2766
}
2767
}
2768
if(debug and (interfaces_to_take_down == NULL)){
2769
fprintf_plus(stderr, "No interfaces were brought up\n");
2770
}
2771
}
2772
2773
/* If we only got one interface, explicitly use only that one */
2774
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2775
if(debug){
2776
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2777
mc.interfaces);
2778
}
2779
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
2780
1539
}
2781
1540
2782
1541
if(quit_now){
2783
1542
goto end;
2784
1543
}
2785
1544
2786
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1545
ret = init_gnutls_global(pubkey, seckey);
2787
1546
if(ret == -1){
2788
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2789
1548
exitcode = EX_UNAVAILABLE;
2790
1549
goto end;
2791
1550
} else {
2796
1555
goto end;
2797
1556
}
2798
1557
2799
/* Try /run/tmp before /tmp */
2800
tempdir = mkdtemp(run_tempdir);
2801
if(tempdir == NULL and errno == ENOENT){
2802
if(debug){
2803
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2804
run_tempdir, old_tempdir);
2805
}
2806
tempdir = mkdtemp(old_tempdir);
2807
}
2808
if(tempdir == NULL){
2809
perror_plus("mkdtemp");
1558
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
2810
1562
goto end;
2811
1563
}
2812
1564
2814
1566
goto end;
2815
1567
}
2816
1568
2817
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2818
fprintf_plus(stderr, "init_gpgme failed\n");
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2819
1571
exitcode = EX_UNAVAILABLE;
2820
1572
goto end;
2821
1573
} else {
2830
1582
/* Connect directly, do not use Zeroconf */
2831
1583
/* (Mainly meant for debugging) */
2832
1584
char *address = strrchr(connect_to, ':');
2833
2834
1585
if(address == NULL){
2835
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2836
1587
exitcode = EX_USAGE;
2837
1588
goto end;
2838
1589
}
2841
1592
goto end;
2842
1593
}
2843
1594
2844
in_port_t port;
1595
uint16_t port;
2845
1596
errno = 0;
2846
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2847
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2848
or tmpmax != (in_port_t)tmpmax){
2849
fprintf_plus(stderr, "Bad port number\n");
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2850
1601
exitcode = EX_USAGE;
2851
1602
goto end;
2852
1603
}
2853
1604
2854
1605
if(quit_now){
2855
1606
goto end;
2856
1607
}
2857
1608
2858
port = (in_port_t)tmpmax;
1609
port = (uint16_t)tmpmax;
2859
1610
*address = '\0';
1611
address = connect_to;
2860
1612
/* Colon in address indicates IPv6 */
2861
1613
int af;
2862
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2863
1615
af = AF_INET6;
2864
/* Accept [] around IPv6 address - see RFC 5952 */
2865
if(connect_to[0] == '[' and address[-1] == ']')
2866
{
2867
connect_to++;
2868
address[-1] = '\0';
2869
}
2870
1616
} else {
2871
1617
af = AF_INET;
2872
1618
}
2873
address = connect_to;
2874
1619
2875
1620
if(quit_now){
2876
1621
goto end;
2877
1622
}
2878
1623
2879
1624
while(not quit_now){
2880
ret = start_mandos_communication(address, port, if_index, af,
2881
&mc);
1625
ret = start_mandos_communication(address, port, if_index, af);
2882
1626
if(quit_now or ret == 0){
2883
1627
break;
2884
1628
}
2885
if(debug){
2886
fprintf_plus(stderr, "Retrying in %d seconds\n",
2887
(int)retry_interval);
2888
}
2889
sleep((unsigned int)retry_interval);
2890
}
2891
2892
if(not quit_now){
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
2893
1633
exitcode = EXIT_SUCCESS;
2894
1634
}
2895
1635
2896
1636
goto end;
2897
1637
}
2898
1638
2910
1650
config.publish_domain = 0;
2911
1651
2912
1652
/* Allocate a new server */
2913
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2914
&config, NULL, NULL, &ret);
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2915
1656
2916
1657
/* Free the Avahi configuration data */
2917
1658
avahi_server_config_free(&config);
2919
1660
2920
1661
/* Check if creating the Avahi server object succeeded */
2921
1662
if(mc.server == NULL){
2922
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2923
avahi_strerror(ret));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2924
1665
exitcode = EX_UNAVAILABLE;
2925
1666
goto end;
2926
1667
}
2932
1673
/* Create the Avahi service browser */
2933
1674
sb = avahi_s_service_browser_new(mc.server, if_index,
2934
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2935
NULL, 0, browse_callback,
2936
(void *)&mc);
1676
NULL, 0, browse_callback, NULL);
2937
1677
if(sb == NULL){
2938
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2939
avahi_strerror(avahi_server_errno(mc.server)));
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2940
1680
exitcode = EX_UNAVAILABLE;
2941
1681
goto end;
2942
1682
}
2948
1688
/* Run the main loop */
2949
1689
2950
1690
if(debug){
2951
fprintf_plus(stderr, "Starting Avahi loop search\n");
1691
fprintf(stderr, "Starting Avahi loop search\n");
2952
1692
}
2953
1693
2954
ret = avahi_loop_with_timeout(simple_poll,
2955
(int)(retry_interval * 1000), &mc);
2956
if(debug){
2957
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2958
(ret == 0) ? "successfully" : "with error");
2959
}
1694
avahi_simple_poll_loop(mc.simple_poll);
2960
1695
2961
1696
end:
2962
1697
2963
1698
if(debug){
2964
if(signal_received){
2965
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2966
argv[0], signal_received,
2967
strsignal(signal_received));
2968
} else {
2969
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
}
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2971
1700
}
2972
1701
2973
1702
/* Cleanup things */
2974
free(mc.interfaces);
2975
2976
1703
if(sb != NULL)
2977
1704
avahi_s_service_browser_free(sb);
2978
1705
2979
1706
if(mc.server != NULL)
2980
1707
avahi_server_free(mc.server);
2981
1708
2982
if(simple_poll != NULL)
2983
avahi_simple_poll_free(simple_poll);
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2984
1711
2985
1712
if(gnutls_initialized){
2986
1713
gnutls_certificate_free_credentials(mc.cred);
1714
gnutls_global_deinit();
2987
1715
gnutls_dh_params_deinit(mc.dh_params);
2988
1716
}
2989
1717
2991
1719
gpgme_release(mc.ctx);
2992
1720
}
2993
1721
2994
/* Cleans up the circular linked list of Mandos servers the client
2995
has seen */
2996
if(mc.current_server != NULL){
2997
mc.current_server->prev->next = NULL;
2998
while(mc.current_server != NULL){
2999
server *next = mc.current_server->next;
3000
#ifdef __GNUC__
3001
#pragma GCC diagnostic push
3002
#pragma GCC diagnostic ignored "-Wcast-qual"
3003
#endif
3004
free((char *)(mc.current_server->ip));
3005
#ifdef __GNUC__
3006
#pragma GCC diagnostic pop
3007
#endif
3008
free(mc.current_server);
3009
mc.current_server = next;
3010
}
3011
}
3012
3013
/* Re-raise privileges */
3014
{
3015
ret = raise_privileges();
3016
if(ret != 0){
3017
errno = ret;
3018
perror_plus("Failed to raise privileges");
3019
} else {
3020
3021
/* Run network hooks */
3022
run_network_hooks("stop", interfaces_hooks != NULL ?
3023
interfaces_hooks : "", delay);
3024
3025
/* Take down the network interfaces which were brought up */
3026
{
3027
char *interface = NULL;
3028
while((interface = argz_next(interfaces_to_take_down,
3029
interfaces_to_take_down_size,
3030
interface))){
3031
ret = take_down_interface(interface);
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to take down interface");
3035
}
3036
}
3037
if(debug and (interfaces_to_take_down == NULL)){
3038
fprintf_plus(stderr, "No interfaces needed to be taken"
3039
" down\n");
3040
}
3041
}
3042
}
3043
3044
ret = lower_privileges_permanently();
3045
if(ret != 0){
3046
errno = ret;
3047
perror_plus("Failed to lower privileges permanently");
3048
}
3049
}
3050
3051
free(interfaces_to_take_down);
3052
free(interfaces_hooks);
3053
3054
void clean_dir_at(int base, const char * const dirname,
3055
uintmax_t level){
3056
struct dirent **direntries = NULL;
3057
int dret;
3058
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3059
O_RDONLY
3060
| O_NOFOLLOW
3061
| O_DIRECTORY
3062
| O_PATH));
3063
if(dir_fd == -1){
3064
perror_plus("open");
3065
return;
3066
}
3067
int numentries = scandirat(dir_fd, ".", &direntries,
3068
notdotentries, alphasort);
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
if(debug){
3072
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3073
dirname, direntries[i]->d_name);
3074
}
3075
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3076
if(dret == -1){
3077
if(errno == EISDIR){
3078
dret = unlinkat(dir_fd, direntries[i]->d_name,
3079
AT_REMOVEDIR);
3080
}
3081
if((dret == -1) and (errno == ENOTEMPTY)
3082
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3083
== 0) and (level == 0)){
3084
/* Recurse only in this special case */
3085
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3086
dret = 0;
3087
}
3088
if((dret == -1) and (errno != ENOENT)){
3089
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3090
direntries[i]->d_name, strerror(errno));
3091
}
3092
}
3093
free(direntries[i]);
3094
}
3095
3096
/* need to clean even if 0 because man page doesn't specify */
3097
free(direntries);
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
3108
/* Removes the GPGME temp directory and all files inside */
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
/* Removes the temp directory used by GPGME */
1755
if(tempdir_created){
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
1776
char *fullname = NULL;
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
direntry->d_name);
1779
if(ret < 0){
1780
perror("asprintf");
1781
continue;
1782
}
1783
ret = remove(fullname);
1784
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
1787
}
1788
free(fullname);
1789
}
1790
closedir(d);
1791
}
1792
ret = rmdir(tempdir);
1793
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
1795
}
3111
1796
}
3112
1797
3113
1798
if(quit_now){
3117
1802
&old_sigterm_action,
3118
1803
NULL));
3119
1804
if(ret == -1){
3120
perror_plus("sigaction");
1805
perror("sigaction");
3121
1806
}
3122
1807
do {
3123
1808
ret = raise(signal_received);
3124
1809
} while(ret != 0 and errno == EINTR);
3125
1810
if(ret != 0){
3126
perror_plus("raise");
1811
perror("raise");
3127
1812
abort();
3128
1813
}
3129
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0