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» Revision
237.7.492
(compared to revision 237.7.31)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2018-04-01 19:27:30 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 368.
- Revision ID: teddy@recompile.se-20180401192730-jwr4io5cb3x5u268
Don't print NULL string pointers in error message output
* plugins.d/mandos-client.c (pgp_packet_decrypt): If decryption fails,
don't print unsupported_algorithm if it is NULL.
* plugins.d/mandos-client.c (pgp_packet_decrypt): If decryption fails,
don't print unsupported_algorithm if it is NULL.
- files added:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
31
32
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
55
57
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
66
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#include <time.h> /* nanosleep(), time(), sleep() */
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74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
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SIOCSIFFLAGS, if_indextoname(),
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79
*/
73
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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81
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
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#include <iso646.h> /* not, or, and */
78
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#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
84
92
raise() */
85
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
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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() */
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105
#ifdef __linux__
89
106
#include <sys/klog.h> /* klogctl() */
107
124
init_gnutls_session(),
108
125
GNUTLS_* */
109
126
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
112
129
113
130
/* GPGME */
114
131
#include <gpgme.h> /* All GPGME types, constants and
122
139
#define PATHDIR "/conf/conf.d/mandos"
123
140
#define SECKEY "seckey.txt"
124
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
143
126
144
bool debug = false;
127
145
static const char mandos_protocol_version[] = "1";
128
146
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
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148
static const char sys_class_net[] = "/sys/class/net";
131
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
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;
132
165
133
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/* Used for passing in values through the Avahi callback functions */
134
167
typedef struct {
135
AvahiSimplePoll *simple_poll;
136
168
AvahiServer *server;
137
169
gnutls_certificate_credentials_t cred;
138
170
unsigned int dh_bits;
139
171
gnutls_dh_params_t dh_params;
140
172
const char *priority;
141
173
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
142
177
} mandos_context;
143
178
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" };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
148
181
149
182
sig_atomic_t quit_now = 0;
150
183
int signal_received = 0;
151
184
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
152
204
/*
153
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
206
* bytes. "buffer_capacity" is how much is currently allocated,
155
207
* "buffer_length" is how much is already used.
156
208
*/
209
__attribute__((nonnull, warn_unused_result))
157
210
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
211
size_t buffer_capacity){
159
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
162
219
return 0;
163
220
}
221
*buffer = new_buf;
164
222
buffer_capacity += BUFFER_SIZE;
165
223
}
166
224
return buffer_capacity;
167
225
}
168
226
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
169
275
/*
170
276
* Initialize GPGME.
171
277
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
174
283
gpgme_error_t rc;
175
284
gpgme_engine_info_t engine_info;
176
285
177
178
286
/*
179
287
* Helper function to insert pub and seckey to the engine keyring.
180
288
*/
181
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
182
290
int ret;
183
291
int fd;
184
292
gpgme_data_t pgp_data;
185
293
186
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
295
if(fd == -1){
188
perror("open");
296
perror_plus("open");
189
297
return false;
190
298
}
191
299
192
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rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
301
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
196
304
return false;
197
305
}
198
306
199
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
200
308
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
203
311
return false;
204
312
}
205
313
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
207
315
if(ret == -1){
208
perror("close");
316
perror_plus("close");
209
317
}
210
318
gpgme_data_release(pgp_data);
211
319
return true;
212
320
}
213
321
214
322
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
323
fprintf_plus(stderr, "Initializing GPGME\n");
216
324
}
217
325
218
326
/* Init GPGME */
219
327
gpgme_check_version(NULL);
220
328
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
329
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
224
332
return false;
225
333
}
226
334
227
/* Set GPGME home directory for the OpenPGP engine only */
335
/* Set GPGME home directory for the OpenPGP engine only */
228
336
rc = gpgme_get_engine_info(&engine_info);
229
337
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
232
340
return false;
233
341
}
234
342
while(engine_info != NULL){
240
348
engine_info = engine_info->next;
241
349
}
242
350
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
244
353
return false;
245
354
}
246
355
247
356
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
249
358
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
252
362
return false;
253
363
}
254
364
263
373
* Decrypt OpenPGP data.
264
374
* Returns -1 on error
265
375
*/
376
__attribute__((nonnull, warn_unused_result))
266
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
378
size_t crypto_size,
268
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
269
381
gpgme_data_t dh_crypto, dh_plain;
270
382
gpgme_error_t rc;
271
383
ssize_t ret;
273
385
ssize_t plaintext_length = 0;
274
386
275
387
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
389
}
278
390
279
391
/* Create new GPGME data buffer from memory cryptotext */
280
392
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
393
0);
282
394
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
285
397
return -1;
286
398
}
287
399
288
400
/* Create new empty GPGME data buffer for the plaintext */
289
401
rc = gpgme_data_new(&dh_plain);
290
402
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
293
406
gpgme_data_release(dh_crypto);
294
407
return -1;
295
408
}
296
409
297
410
/* Decrypt data from the cryptotext data buffer to the plaintext
298
411
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
413
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
303
416
plaintext_length = -1;
304
417
if(debug){
305
418
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
307
420
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
422
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
427
fprintf_plus(stderr, "Wrong key usage: %u\n",
428
result->wrong_key_usage);
314
429
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
430
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
431
}
317
432
gpgme_recipient_t recipient;
318
433
recipient = result->recipients;
319
434
while(recipient != NULL){
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");
435
fprintf_plus(stderr, "Public key algorithm: %s\n",
436
gpgme_pubkey_algo_name
437
(recipient->pubkey_algo));
438
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
439
fprintf_plus(stderr, "Secret key available: %s\n",
440
recipient->status == GPG_ERR_NO_SECKEY
441
? "No" : "Yes");
326
442
recipient = recipient->next;
327
443
}
328
444
}
331
447
}
332
448
333
449
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
450
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
451
}
336
452
337
453
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
454
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
455
perror_plus("gpgme_data_seek");
340
456
plaintext_length = -1;
341
457
goto decrypt_end;
342
458
}
344
460
*plaintext = NULL;
345
461
while(true){
346
462
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
463
(size_t)plaintext_length,
464
plaintext_capacity);
349
465
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
466
perror_plus("incbuffer");
467
plaintext_length = -1;
468
goto decrypt_end;
353
469
}
354
470
355
471
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
476
break;
361
477
}
362
478
if(ret < 0){
363
perror("gpgme_data_read");
479
perror_plus("gpgme_data_read");
364
480
plaintext_length = -1;
365
481
goto decrypt_end;
366
482
}
368
484
}
369
485
370
486
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
487
fprintf_plus(stderr, "Decrypted password is: ");
372
488
for(ssize_t i = 0; i < plaintext_length; i++){
373
489
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
490
}
385
501
return plaintext_length;
386
502
}
387
503
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;
504
__attribute__((warn_unused_result, const))
505
static const char *safe_string(const char *str){
506
if(str == NULL)
507
return "(unknown)";
508
return str;
509
}
510
511
__attribute__((warn_unused_result))
512
static const char *safer_gnutls_strerror(int value){
513
const char *ret = gnutls_strerror(value);
514
return safe_string(ret);
394
515
}
395
516
396
517
/* GnuTLS log function callback */
518
__attribute__((nonnull))
397
519
static void debuggnutls(__attribute__((unused)) int level,
398
520
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
521
fprintf_plus(stderr, "GnuTLS: %s", string);
400
522
}
401
523
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
402
525
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
526
const char *seckeyfilename,
527
const char *dhparamsfilename,
528
mandos_context *mc){
404
529
int ret;
530
unsigned int uret;
405
531
406
532
if(debug){
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;
533
fprintf_plus(stderr, "Initializing GnuTLS\n");
415
534
}
416
535
417
536
if(debug){
423
542
}
424
543
425
544
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
545
ret = gnutls_certificate_allocate_credentials(&mc->cred);
427
546
if(ret != GNUTLS_E_SUCCESS){
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
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
safer_gnutls_strerror(ret));
434
549
return -1;
435
550
}
436
551
437
552
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
441
557
}
442
558
443
559
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
445
561
GNUTLS_OPENPGP_FMT_BASE64);
446
562
if(ret != GNUTLS_E_SUCCESS){
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));
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
452
568
goto globalfail;
453
569
}
454
570
455
571
/* GnuTLS server initialization */
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);
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
624
}
625
if(dhparamsfilename == NULL){
626
break;
627
}
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
635
}
636
free(params.data);
637
} while(false);
638
}
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
644
do {
645
int secfile = open(seckeyfilename, O_RDONLY);
646
if(secfile == -1){
647
perror_plus("open");
648
break;
649
}
650
size_t buffer_capacity = 0;
651
while(true){
652
buffer_capacity = incbuffer((char **)&buffer.data,
653
(size_t)buffer.size,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
657
free(buffer.data);
658
buffer.data = NULL;
659
break;
660
}
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
663
BUFFER_SIZE);
664
/* EOF */
665
if(bytes_read == 0){
666
break;
667
}
668
/* check bytes_read for failure */
669
if(bytes_read < 0){
670
perror_plus("read");
671
free(buffer.data);
672
buffer.data = NULL;
673
break;
674
}
675
buffer.size += (unsigned int)bytes_read;
676
}
677
close(secfile);
678
} while(false);
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
682
{
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
687
" structure: %s",
688
safer_gnutls_strerror(ret));
689
free(buffer.data);
690
buffer.data = NULL;
691
} else {
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
697
privkey = NULL;
698
}
699
free(buffer.data);
700
buffer.data = NULL;
701
if(privkey != NULL){
702
/* Use private key to suggest an appropriate
703
sec_param */
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
706
if(debug){
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
710
(sec_param)));
711
}
712
}
713
}
714
}
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
718
if(debug){
719
fprintf_plus(stderr, "Falling back to security parameter"
720
" \"%s\"\n",
721
safe_string(gnutls_sec_param_get_name
722
(sec_param)));
723
}
724
}
725
}
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
727
if(uret != 0){
728
mc->dh_bits = uret;
729
if(debug){
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
mc->dh_bits);
735
}
736
} else {
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
740
(sec_param)),
741
safer_gnutls_strerror(ret));
742
goto globalfail;
743
}
744
} else if(debug){
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
mc->dh_bits);
747
}
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
753
goto globalfail;
754
}
755
}
756
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
757
471
758
return 0;
472
759
473
760
globalfail:
474
761
475
gnutls_certificate_free_credentials(mc.cred);
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
762
gnutls_certificate_free_credentials(mc->cred);
763
gnutls_dh_params_deinit(mc->dh_params);
478
764
return -1;
479
765
}
480
766
481
static int init_gnutls_session(gnutls_session_t *session){
767
__attribute__((nonnull, warn_unused_result))
768
static int init_gnutls_session(gnutls_session_t *session,
769
mandos_context *mc){
482
770
int ret;
483
771
/* GnuTLS session creation */
484
772
do {
488
776
}
489
777
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
778
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
779
fprintf_plus(stderr,
780
"Error in GnuTLS session initialization: %s\n",
781
safer_gnutls_strerror(ret));
493
782
}
494
783
495
784
{
496
785
const char *err;
497
786
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
787
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
499
788
if(quit_now){
500
789
gnutls_deinit(*session);
501
790
return -1;
502
791
}
503
792
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
793
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
794
fprintf_plus(stderr, "Syntax error at: %s\n", err);
795
fprintf_plus(stderr, "GnuTLS error: %s\n",
796
safer_gnutls_strerror(ret));
508
797
gnutls_deinit(*session);
509
798
return -1;
510
799
}
512
801
513
802
do {
514
803
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
804
mc->cred);
516
805
if(quit_now){
517
806
gnutls_deinit(*session);
518
807
return -1;
519
808
}
520
809
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
810
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
811
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
812
safer_gnutls_strerror(ret));
524
813
gnutls_deinit(*session);
525
814
return -1;
526
815
}
528
817
/* ignore client certificate if any. */
529
818
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
530
819
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
533
820
return 0;
534
821
}
535
822
537
824
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
538
825
__attribute__((unused)) const char *txt){}
539
826
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
832
if(seteuid(0) == -1){
833
ret = errno;
834
}
835
errno = old_errno;
836
return ret;
837
}
838
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
if(ret != 0){
845
errno = old_errno;
846
return ret;
847
}
848
if(setuid(0) == -1){
849
ret = errno;
850
}
851
errno = old_errno;
852
return ret;
853
}
854
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
860
if(seteuid(uid) == -1){
861
ret = errno;
862
}
863
errno = old_errno;
864
return ret;
865
}
866
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
872
if(setuid(uid) == -1){
873
ret = errno;
874
}
875
errno = old_errno;
876
return ret;
877
}
878
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
882
const char *address,
883
AvahiIfIndex if_index){
884
int ret;
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
891
if(debug){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
894
}
895
return false;
896
}
897
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
901
return false;
902
}
903
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
905
if(devnull == -1){
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
return false;
908
}
909
pid_t pid = fork();
910
if(pid == 0){
911
/* Child */
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
914
if(errno != 0){
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
917
} else {
918
/* Set group */
919
errno = 0;
920
ret = setgid(0);
921
if(ret == -1){
922
perror_plus("setgid");
923
_exit(EX_NOPERM);
924
}
925
/* Reset supplementary groups */
926
errno = 0;
927
ret = setgroups(0, NULL);
928
if(ret == -1){
929
perror_plus("setgroups");
930
_exit(EX_NOPERM);
931
}
932
}
933
ret = dup2(devnull, STDIN_FILENO);
934
if(ret == -1){
935
perror_plus("dup2(devnull, STDIN_FILENO)");
936
_exit(EX_OSERR);
937
}
938
ret = close(devnull);
939
if(ret == -1){
940
perror_plus("close");
941
_exit(EX_OSERR);
942
}
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
944
if(ret == -1){
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
_exit(EX_OSERR);
947
}
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
O_RDONLY
950
| O_DIRECTORY
951
| O_PATH
952
| O_CLOEXEC));
953
if(helperdir_fd == -1){
954
perror_plus("open");
955
_exit(EX_UNAVAILABLE);
956
}
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
helper, O_RDONLY));
959
if(helper_fd == -1){
960
perror_plus("openat");
961
close(helperdir_fd);
962
_exit(EX_UNAVAILABLE);
963
}
964
close(helperdir_fd);
965
#ifdef __GNUC__
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
968
#endif
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
972
environ) == -1){
973
#ifdef __GNUC__
974
#pragma GCC diagnostic pop
975
#endif
976
perror_plus("fexecve");
977
_exit(EXIT_FAILURE);
978
}
979
}
980
if(pid == -1){
981
perror_plus("fork");
982
return false;
983
}
984
int status;
985
pid_t pret = -1;
986
errno = 0;
987
do {
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
995
}
996
if(kill(pid, SIGTERM) == -1){
997
perror_plus("kill");
998
}
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1001
" helper program");
1002
}
1003
return false;
1004
}
1005
} while(pret == -1 and errno == EINTR);
1006
if(pret == -1){
1007
perror_plus("waitpid");
1008
return false;
1009
}
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1014
return false;
1015
}
1016
return true;
1017
}
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1021
return false;
1022
}
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1024
return false;
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1032
}
1033
return add_delete_local_route(true, address, if_index);
1034
}
1035
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1039
if(debug){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1041
}
1042
return add_delete_local_route(false, address, if_index);
1043
}
1044
540
1045
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
1046
__attribute__((nonnull, warn_unused_result))
1047
static int start_mandos_communication(const char *ip, in_port_t port,
542
1048
AvahiIfIndex if_index,
543
int af){
1049
int af, mandos_context *mc){
544
1050
int ret, tcp_sd = -1;
545
1051
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
1052
struct sockaddr_storage to;
550
1053
char *buffer = NULL;
551
1054
char *decrypted_buffer = NULL;
552
1055
size_t buffer_length = 0;
555
1058
int retval = -1;
556
1059
gnutls_session_t session;
557
1060
int pf; /* Protocol family */
1061
bool route_added = false;
558
1062
559
1063
errno = 0;
560
1064
571
1075
pf = PF_INET;
572
1076
break;
573
1077
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
1078
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
1079
errno = EINVAL;
576
1080
return -1;
577
1081
}
578
1082
579
ret = init_gnutls_session(&session);
1083
/* If the interface is specified and we have a list of interfaces */
1084
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1085
/* Check if the interface is one of the interfaces we are using */
1086
bool match = false;
1087
{
1088
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
1092
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
match = true;
1094
break;
1095
}
1096
}
1097
}
1098
if(not match){
1099
/* This interface does not match any in the list, so we don't
1100
connect to the server */
1101
if(debug){
1102
char interface[IF_NAMESIZE];
1103
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1104
perror_plus("if_indextoname");
1105
} else {
1106
fprintf_plus(stderr, "Skipping server on non-used interface"
1107
" \"%s\"\n",
1108
if_indextoname((unsigned int)if_index,
1109
interface));
1110
}
1111
}
1112
return -1;
1113
}
1114
}
1115
1116
ret = init_gnutls_session(&session, mc);
580
1117
if(ret != 0){
581
1118
return -1;
582
1119
}
583
1120
584
1121
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
1122
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1123
PRIuMAX "\n", ip, (uintmax_t)port);
587
1124
}
588
1125
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
590
1127
if(tcp_sd < 0){
591
1128
int e = errno;
592
perror("socket");
1129
perror_plus("socket");
593
1130
errno = e;
594
1131
goto mandos_end;
595
1132
}
599
1136
goto mandos_end;
600
1137
}
601
1138
602
memset(&to, 0, sizeof(to));
603
1139
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
606
1143
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
609
1147
}
610
1148
if(ret < 0 ){
611
1149
int e = errno;
612
perror("inet_pton");
1150
perror_plus("inet_pton");
613
1151
errno = e;
614
1152
goto mandos_end;
615
1153
}
616
1154
if(ret == 0){
617
1155
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
1156
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
1157
errno = e;
620
1158
goto mandos_end;
621
1159
}
622
1160
if(af == AF_INET6){
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*/
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
630
1164
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
1165
fprintf_plus(stderr, "An IPv6 link-local address is"
1166
" incomplete without a network interface\n");
633
1167
errno = EINVAL;
634
1168
goto mandos_end;
635
1169
}
636
1170
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
638
1172
}
639
1173
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
643
1175
}
644
1176
645
1177
if(quit_now){
651
1183
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
1184
char interface[IF_NAMESIZE];
653
1185
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
1186
perror_plus("if_indextoname");
655
1187
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
1188
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1189
"\n", ip, interface, (uintmax_t)port);
658
1190
}
659
1191
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
1192
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1193
ip, (uintmax_t)port);
662
1194
}
663
1195
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
1196
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
1197
if(af == AF_INET6){
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in6),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
} else {
1203
ret = getnameinfo((struct sockaddr *)&to,
1204
sizeof(struct sockaddr_in),
1205
addrstr, sizeof(addrstr), NULL, 0,
1206
NI_NUMERICHOST);
1207
}
1208
if(ret == EAI_SYSTEM){
1209
perror_plus("getnameinfo");
1210
} else if(ret != 0) {
1211
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1212
} else if(strcmp(addrstr, ip) != 0){
1213
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
}
1215
}
1216
1217
if(quit_now){
1218
errno = EINTR;
1219
goto mandos_end;
1220
}
1221
1222
while(true){
1223
if(af == AF_INET6){
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1226
} else {
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1229
}
1230
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1237
&to)->sin6_addr)))
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1248
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1252
*/
1253
if(debug){
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1255
" direct route\n");
1256
}
1257
int e = errno;
1258
route_added = add_local_route(ip, if_index);
1259
if(route_added){
1260
continue;
1261
}
1262
errno = e;
1263
}
1264
if(errno != ECONNREFUSED or debug){
1265
int e = errno;
1266
perror_plus("connect");
1267
errno = e;
1268
}
1269
goto mandos_end;
1270
}
1271
1272
if(quit_now){
1273
errno = EINTR;
1274
goto mandos_end;
1275
}
1276
break;
704
1277
}
705
1278
706
1279
const char *out = mandos_protocol_version;
708
1281
while(true){
709
1282
size_t out_size = strlen(out);
710
1283
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
1284
out_size - written));
712
1285
if(ret == -1){
713
1286
int e = errno;
714
perror("write");
1287
perror_plus("write");
715
1288
errno = e;
716
1289
goto mandos_end;
717
1290
}
734
1307
}
735
1308
736
1309
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1310
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
1311
}
739
1312
740
1313
if(quit_now){
742
1315
goto mandos_end;
743
1316
}
744
1317
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1318
/* This casting via intptr_t is to eliminate warning about casting
1319
an int to a pointer type. This is exactly how the GnuTLS Guile
1320
function "set-session-transport-fd!" does it. */
1321
gnutls_transport_set_ptr(session,
1322
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
746
1323
747
1324
if(quit_now){
748
1325
errno = EINTR;
759
1336
760
1337
if(ret != GNUTLS_E_SUCCESS){
761
1338
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1339
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
1340
gnutls_perror(ret);
764
1341
}
765
1342
errno = EPROTO;
769
1346
/* Read OpenPGP packet that contains the wanted password */
770
1347
771
1348
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
1349
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1350
" %s\n", ip);
774
1351
}
775
1352
776
1353
while(true){
781
1358
}
782
1359
783
1360
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
1361
buffer_capacity);
785
1362
if(buffer_capacity == 0){
786
1363
int e = errno;
787
perror("incbuffer");
1364
perror_plus("incbuffer");
788
1365
errno = e;
789
1366
goto mandos_end;
790
1367
}
814
1391
}
815
1392
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
1393
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1394
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1395
"***\n");
818
1396
gnutls_perror(ret);
819
1397
errno = EPROTO;
820
1398
goto mandos_end;
821
1399
}
822
1400
break;
823
1401
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
1402
fprintf_plus(stderr, "Unknown error while reading data from"
1403
" encrypted session with Mandos server\n");
826
1404
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
1405
errno = EIO;
828
1406
goto mandos_end;
833
1411
}
834
1412
835
1413
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
1414
fprintf_plus(stderr, "Closing TLS session\n");
837
1415
}
838
1416
839
1417
if(quit_now){
851
1429
852
1430
if(buffer_length > 0){
853
1431
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
1432
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1433
&decrypted_buffer, mc);
857
1434
if(decrypted_buffer_size >= 0){
858
1435
1436
clearerr(stdout);
859
1437
written = 0;
860
1438
while(written < (size_t) decrypted_buffer_size){
861
1439
if(quit_now){
869
1447
if(ret == 0 and ferror(stdout)){
870
1448
int e = errno;
871
1449
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
1450
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1451
strerror(errno));
874
1452
}
875
1453
errno = e;
876
1454
goto mandos_end;
877
1455
}
878
1456
written += (size_t)ret;
879
1457
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
880
1468
retval = 0;
881
1469
}
882
1470
}
885
1473
886
1474
mandos_end:
887
1475
{
1476
if(route_added){
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1479
" interface %d", ip, if_index);
1480
}
1481
}
888
1482
int e = errno;
889
1483
free(decrypted_buffer);
890
1484
free(buffer);
891
1485
if(tcp_sd >= 0){
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1486
ret = close(tcp_sd);
893
1487
}
894
1488
if(ret == -1){
895
1489
if(e == 0){
896
1490
e = errno;
897
1491
}
898
perror("close");
1492
perror_plus("close");
899
1493
}
900
1494
gnutls_deinit(session);
1495
errno = e;
901
1496
if(quit_now){
902
e = EINTR;
1497
errno = EINTR;
903
1498
retval = -1;
904
1499
}
905
errno = e;
906
1500
}
907
1501
return retval;
908
1502
}
920
1514
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
1515
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
1516
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1517
void *mc){
1518
if(r == NULL){
1519
return;
1520
}
925
1521
926
1522
/* Called whenever a service has been resolved successfully or
927
1523
timed out */
928
1524
929
1525
if(quit_now){
1526
avahi_s_service_resolver_free(r);
930
1527
return;
931
1528
}
932
1529
933
1530
switch(event){
934
1531
default:
935
1532
case AVAHI_RESOLVER_FAILURE:
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)));
1533
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1534
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1535
domain,
1536
avahi_strerror(avahi_server_errno
1537
(((mandos_context*)mc)->server)));
939
1538
break;
940
1539
941
1540
case AVAHI_RESOLVER_FOUND:
943
1542
char ip[AVAHI_ADDRESS_STR_MAX];
944
1543
avahi_address_snprint(ip, sizeof(ip), address);
945
1544
if(debug){
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);
1545
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1546
PRIdMAX ") on port %" PRIu16 "\n", name,
1547
host_name, ip, (intmax_t)interface, port);
949
1548
}
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1549
int ret = start_mandos_communication(ip, (in_port_t)port,
1550
interface,
1551
avahi_proto_to_af(proto),
1552
mc);
952
1553
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
1554
avahi_simple_poll_quit(simple_poll);
1555
} else {
1556
if(not add_server(ip, (in_port_t)port, interface,
1557
avahi_proto_to_af(proto),
1558
&((mandos_context*)mc)->current_server)){
1559
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1560
" list\n", name);
1561
}
954
1562
}
955
1563
}
956
1564
}
966
1574
const char *domain,
967
1575
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
1576
flags,
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1577
void *mc){
1578
if(b == NULL){
1579
return;
1580
}
971
1581
972
1582
/* Called whenever a new services becomes available on the LAN or
973
1583
is removed from the LAN */
980
1590
default:
981
1591
case AVAHI_BROWSER_FAILURE:
982
1592
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1593
fprintf_plus(stderr, "(Avahi browser) %s\n",
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
1596
avahi_simple_poll_quit(simple_poll);
986
1597
return;
987
1598
988
1599
case AVAHI_BROWSER_NEW:
991
1602
the callback function is called the Avahi server will free the
992
1603
resolver for us. */
993
1604
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)));
1605
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1606
interface, protocol, name, type,
1607
domain, protocol, 0,
1608
resolve_callback, mc) == NULL)
1609
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1610
" %s\n", name,
1611
avahi_strerror(avahi_server_errno
1612
(((mandos_context*)mc)->server)));
999
1613
break;
1000
1614
1001
1615
case AVAHI_BROWSER_REMOVE:
1004
1618
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1619
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1620
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1621
fprintf_plus(stderr, "No Mandos server found, still"
1622
" searching...\n");
1008
1623
}
1009
1624
break;
1010
1625
}
1011
1626
}
1012
1627
1013
/* stop main loop after sigterm has been called */
1628
/* Signal handler that stops main loop after SIGTERM */
1014
1629
static void handle_sigterm(int sig){
1015
1630
if(quit_now){
1016
1631
return;
1018
1633
quit_now = 1;
1019
1634
signal_received = sig;
1020
1635
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1636
/* set main loop to exit */
1637
if(simple_poll != NULL){
1638
avahi_simple_poll_quit(simple_poll);
1023
1639
}
1024
1640
errno = old_errno;
1025
1641
}
1026
1642
1643
__attribute__((nonnull, warn_unused_result))
1644
bool get_flags(const char *ifname, struct ifreq *ifr){
1645
int ret;
1646
int old_errno;
1647
1648
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1649
if(s < 0){
1650
old_errno = errno;
1651
perror_plus("socket");
1652
errno = old_errno;
1653
return false;
1654
}
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1657
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1658
if(ret == -1){
1659
if(debug){
1660
old_errno = errno;
1661
perror_plus("ioctl SIOCGIFFLAGS");
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1668
}
1669
return false;
1670
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1676
return true;
1677
}
1678
1679
__attribute__((nonnull, warn_unused_result))
1680
bool good_flags(const char *ifname, const struct ifreq *ifr){
1681
1682
/* Reject the loopback device */
1683
if(ifr->ifr_flags & IFF_LOOPBACK){
1684
if(debug){
1685
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1686
ifname);
1687
}
1688
return false;
1689
}
1690
/* Accept point-to-point devices only if connect_to is specified */
1691
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1692
if(debug){
1693
fprintf_plus(stderr, "Accepting point-to-point interface"
1694
" \"%s\"\n", ifname);
1695
}
1696
return true;
1697
}
1698
/* Otherwise, reject non-broadcast-capable devices */
1699
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1700
if(debug){
1701
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1702
" \"%s\"\n", ifname);
1703
}
1704
return false;
1705
}
1706
/* Reject non-ARP interfaces (including dummy interfaces) */
1707
if(ifr->ifr_flags & IFF_NOARP){
1708
if(debug){
1709
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1710
ifname);
1711
}
1712
return false;
1713
}
1714
1715
/* Accept this device */
1716
if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1718
}
1719
return true;
1720
}
1721
1027
1722
/*
1028
1723
* This function determines if a directory entry in /sys/class/net
1029
1724
* corresponds to an acceptable network device.
1030
1725
* (This function is passed to scandir(3) as a filter function.)
1031
1726
*/
1727
__attribute__((nonnull, warn_unused_result))
1032
1728
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
1729
if(if_entry->d_name[0] == '.'){
1036
1730
return 0;
1037
1731
}
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if_entry->d_name);
1040
if(ret < 0){
1041
perror("asprintf");
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
free(flagname);
1048
return 0;
1049
}
1050
free(flagname);
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1057
perror("malloc");
1058
close(flags_fd);
1059
return 0;
1060
}
1061
while(to_read > 0){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1063
(size_t)to_read));
1064
if(ssret == -1){
1065
perror("read");
1066
free(flagstring);
1067
close(flags_fd);
1068
return 0;
1069
}
1070
to_read -= ssret;
1071
if(ssret == 0){
1732
1733
struct ifreq ifr;
1734
if(not get_flags(if_entry->d_name, &ifr)){
1735
if(debug){
1736
fprintf_plus(stderr, "Failed to get flags for interface "
1737
"\"%s\"\n", if_entry->d_name);
1738
}
1739
return 0;
1740
}
1741
1742
if(not good_flags(if_entry->d_name, &ifr)){
1743
return 0;
1744
}
1745
return 1;
1746
}
1747
1748
/*
1749
* This function determines if a network interface is up.
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_up(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_UP);
1763
}
1764
1765
/*
1766
* This function determines if a network interface is running
1767
*/
1768
__attribute__((nonnull, warn_unused_result))
1769
bool interface_is_running(const char *interface){
1770
struct ifreq ifr;
1771
if(not get_flags(interface, &ifr)){
1772
if(debug){
1773
fprintf_plus(stderr, "Failed to get flags for interface "
1774
"\"%s\"\n", interface);
1775
}
1776
return false;
1777
}
1778
1779
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1780
}
1781
1782
__attribute__((nonnull, pure, warn_unused_result))
1783
int notdotentries(const struct dirent *direntry){
1784
/* Skip "." and ".." */
1785
if(direntry->d_name[0] == '.'
1786
and (direntry->d_name[1] == '\0'
1787
or (direntry->d_name[1] == '.'
1788
and direntry->d_name[2] == '\0'))){
1789
return 0;
1790
}
1791
return 1;
1792
}
1793
1794
/* Is this directory entry a runnable program? */
1795
__attribute__((nonnull, warn_unused_result))
1796
int runnable_hook(const struct dirent *direntry){
1797
int ret;
1798
size_t sret;
1799
struct stat st;
1800
1801
if((direntry->d_name)[0] == '\0'){
1802
/* Empty name? */
1803
return 0;
1804
}
1805
1806
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1807
"abcdefghijklmnopqrstuvwxyz"
1808
"0123456789"
1809
"_.-");
1810
if((direntry->d_name)[sret] != '\0'){
1811
/* Contains non-allowed characters */
1812
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1814
direntry->d_name);
1815
}
1816
return 0;
1817
}
1818
1819
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1820
if(ret == -1){
1821
if(debug){
1822
perror_plus("Could not stat hook");
1823
}
1824
return 0;
1825
}
1826
if(not (S_ISREG(st.st_mode))){
1827
/* Not a regular file */
1828
if(debug){
1829
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1830
direntry->d_name);
1831
}
1832
return 0;
1833
}
1834
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1835
/* Not executable */
1836
if(debug){
1837
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1838
direntry->d_name);
1839
}
1840
return 0;
1841
}
1842
if(debug){
1843
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1844
direntry->d_name);
1845
}
1846
return 1;
1847
}
1848
1849
__attribute__((nonnull, warn_unused_result))
1850
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1851
mandos_context *mc){
1852
int ret;
1853
struct timespec now;
1854
struct timespec waited_time;
1855
intmax_t block_time;
1856
1857
while(true){
1858
if(mc->current_server == NULL){
1859
if(debug){
1860
fprintf_plus(stderr, "Wait until first server is found."
1861
" No timeout!\n");
1862
}
1863
ret = avahi_simple_poll_iterate(s, -1);
1864
} else {
1865
if(debug){
1866
fprintf_plus(stderr, "Check current_server if we should run"
1867
" it, or wait\n");
1868
}
1869
/* the current time */
1870
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1871
if(ret == -1){
1872
perror_plus("clock_gettime");
1873
return -1;
1874
}
1875
/* Calculating in ms how long time between now and server
1876
who we visted longest time ago. Now - last seen. */
1877
waited_time.tv_sec = (now.tv_sec
1878
- mc->current_server->last_seen.tv_sec);
1879
waited_time.tv_nsec = (now.tv_nsec
1880
- mc->current_server->last_seen.tv_nsec);
1881
/* total time is 10s/10,000ms.
1882
Converting to s from ms by dividing by 1,000,
1883
and ns to ms by dividing by 1,000,000. */
1884
block_time = ((retry_interval
1885
- ((intmax_t)waited_time.tv_sec * 1000))
1886
- ((intmax_t)waited_time.tv_nsec / 1000000));
1887
1888
if(debug){
1889
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1890
block_time);
1891
}
1892
1893
if(block_time <= 0){
1894
ret = start_mandos_communication(mc->current_server->ip,
1895
mc->current_server->port,
1896
mc->current_server->if_index,
1897
mc->current_server->af, mc);
1898
if(ret == 0){
1899
avahi_simple_poll_quit(s);
1900
return 0;
1901
}
1902
ret = clock_gettime(CLOCK_MONOTONIC,
1903
&mc->current_server->last_seen);
1904
if(ret == -1){
1905
perror_plus("clock_gettime");
1906
return -1;
1907
}
1908
mc->current_server = mc->current_server->next;
1909
block_time = 0; /* Call avahi to find new Mandos
1910
servers, but don't block */
1911
}
1912
1913
ret = avahi_simple_poll_iterate(s, (int)block_time);
1914
}
1915
if(ret != 0){
1916
if(ret > 0 or errno != EINTR){
1917
return (ret != 1) ? ret : 0;
1918
}
1919
}
1920
}
1921
}
1922
1923
__attribute__((nonnull))
1924
void run_network_hooks(const char *mode, const char *interface,
1925
const float delay){
1926
struct dirent **direntries = NULL;
1927
if(hookdir_fd == -1){
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1929
| O_CLOEXEC);
1930
if(hookdir_fd == -1){
1931
if(errno == ENOENT){
1932
if(debug){
1933
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1934
" found\n", hookdir);
1935
}
1936
} else {
1937
perror_plus("open");
1938
}
1939
return;
1940
}
1941
}
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
runnable_hook, alphasort);
1949
if(numhooks == -1){
1950
perror_plus("scandir");
1951
close(devnull);
1952
return;
1953
}
1954
struct dirent *direntry;
1955
int ret;
1956
for(int i = 0; i < numhooks; i++){
1957
direntry = direntries[i];
1958
if(debug){
1959
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1960
direntry->d_name);
1961
}
1962
pid_t hook_pid = fork();
1963
if(hook_pid == 0){
1964
/* Child */
1965
/* Raise privileges */
1966
errno = raise_privileges_permanently();
1967
if(errno != 0){
1968
perror_plus("Failed to raise privileges");
1969
_exit(EX_NOPERM);
1970
}
1971
/* Set group */
1972
errno = 0;
1973
ret = setgid(0);
1974
if(ret == -1){
1975
perror_plus("setgid");
1976
_exit(EX_NOPERM);
1977
}
1978
/* Reset supplementary groups */
1979
errno = 0;
1980
ret = setgroups(0, NULL);
1981
if(ret == -1){
1982
perror_plus("setgroups");
1983
_exit(EX_NOPERM);
1984
}
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1986
if(ret == -1){
1987
perror_plus("setenv");
1988
_exit(EX_OSERR);
1989
}
1990
ret = setenv("DEVICE", interface, 1);
1991
if(ret == -1){
1992
perror_plus("setenv");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1996
if(ret == -1){
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
ret = setenv("MODE", mode, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
char *delaystring;
2006
ret = asprintf(&delaystring, "%f", (double)delay);
2007
if(ret == -1){
2008
perror_plus("asprintf");
2009
_exit(EX_OSERR);
2010
}
2011
ret = setenv("DELAY", delaystring, 1);
2012
if(ret == -1){
2013
free(delaystring);
2014
perror_plus("setenv");
2015
_exit(EX_OSERR);
2016
}
2017
free(delaystring);
2018
if(connect_to != NULL){
2019
ret = setenv("CONNECT", connect_to, 1);
2020
if(ret == -1){
2021
perror_plus("setenv");
2022
_exit(EX_OSERR);
2023
}
2024
}
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2026
direntry->d_name,
2027
O_RDONLY));
2028
if(hook_fd == -1){
2029
perror_plus("openat");
2030
_exit(EXIT_FAILURE);
2031
}
2032
if(close(hookdir_fd) == -1){
2033
perror_plus("close");
2034
_exit(EXIT_FAILURE);
2035
}
2036
ret = dup2(devnull, STDIN_FILENO);
2037
if(ret == -1){
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
_exit(EX_OSERR);
2040
}
2041
ret = close(devnull);
2042
if(ret == -1){
2043
perror_plus("close");
2044
_exit(EX_OSERR);
2045
}
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2047
if(ret == -1){
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
_exit(EX_OSERR);
2050
}
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2052
environ) == -1){
2053
perror_plus("fexecve");
2054
_exit(EXIT_FAILURE);
2055
}
2056
} else {
2057
if(hook_pid == -1){
2058
perror_plus("fork");
2059
free(direntry);
2060
continue;
2061
}
2062
int status;
2063
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2064
perror_plus("waitpid");
2065
free(direntry);
2066
continue;
2067
}
2068
if(WIFEXITED(status)){
2069
if(WEXITSTATUS(status) != 0){
2070
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2071
" with status %d\n", direntry->d_name,
2072
WEXITSTATUS(status));
2073
free(direntry);
2074
continue;
2075
}
2076
} else if(WIFSIGNALED(status)){
2077
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2078
" signal %d\n", direntry->d_name,
2079
WTERMSIG(status));
2080
free(direntry);
2081
continue;
2082
} else {
2083
fprintf_plus(stderr, "Warning: network hook \"%s\""
2084
" crashed\n", direntry->d_name);
2085
free(direntry);
2086
continue;
2087
}
2088
}
2089
if(debug){
2090
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2091
direntry->d_name);
2092
}
2093
free(direntry);
2094
}
2095
free(direntries);
2096
if(close(hookdir_fd) == -1){
2097
perror_plus("close");
2098
} else {
2099
hookdir_fd = -1;
2100
}
2101
close(devnull);
2102
}
2103
2104
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
2108
int ret;
2109
struct ifreq network;
2110
unsigned int if_index = if_nametoindex(interface);
2111
if(if_index == 0){
2112
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2113
errno = old_errno;
2114
return ENXIO;
2115
}
2116
2117
if(quit_now){
2118
errno = old_errno;
2119
return EINTR;
2120
}
2121
2122
if(not interface_is_up(interface)){
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
2125
if(not get_flags(interface, &network)){
2126
ret_errno = errno;
2127
fprintf_plus(stderr, "Failed to get flags for interface "
2128
"\"%s\"\n", interface);
2129
errno = old_errno;
2130
return ret_errno;
2131
}
2132
network.ifr_flags |= IFF_UP; /* set flag */
2133
2134
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2135
if(sd == -1){
2136
ret_errno = errno;
2137
perror_plus("socket");
2138
errno = old_errno;
2139
return ret_errno;
2140
}
2141
2142
if(quit_now){
2143
ret = close(sd);
2144
if(ret == -1){
2145
perror_plus("close");
2146
}
2147
errno = old_errno;
2148
return EINTR;
2149
}
2150
2151
if(debug){
2152
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2153
interface);
2154
}
2155
2156
/* Raise privileges */
2157
ret_errno = raise_privileges();
2158
if(ret_errno != 0){
2159
errno = ret_errno;
2160
perror_plus("Failed to raise privileges");
2161
}
2162
2163
#ifdef __linux__
2164
int ret_linux;
2165
bool restore_loglevel = false;
2166
if(ret_errno == 0){
2167
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2168
messages about the network interface to mess up the prompt */
2169
ret_linux = klogctl(8, NULL, 5);
2170
if(ret_linux == -1){
2171
perror_plus("klogctl");
2172
} else {
2173
restore_loglevel = true;
2174
}
2175
}
2176
#endif /* __linux__ */
2177
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2178
ioctl_errno = errno;
2179
#ifdef __linux__
2180
if(restore_loglevel){
2181
ret_linux = klogctl(7, NULL, 0);
2182
if(ret_linux == -1){
2183
perror_plus("klogctl");
2184
}
2185
}
2186
#endif /* __linux__ */
2187
2188
/* If raise_privileges() succeeded above */
2189
if(ret_errno == 0){
2190
/* Lower privileges */
2191
ret_errno = lower_privileges();
2192
if(ret_errno != 0){
2193
errno = ret_errno;
2194
perror_plus("Failed to lower privileges");
2195
}
2196
}
2197
2198
/* Close the socket */
2199
ret = close(sd);
2200
if(ret == -1){
2201
perror_plus("close");
2202
}
2203
2204
if(ret_setflags == -1){
2205
errno = ioctl_errno;
2206
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2207
errno = old_errno;
2208
return ioctl_errno;
2209
}
2210
} else if(debug){
2211
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2212
interface);
2213
}
2214
2215
/* Sleep checking until interface is running.
2216
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
2218
if(interface_is_running(interface)){
1072
2219
break;
1073
2220
}
1074
}
1075
close(flags_fd);
1076
intmax_t tmpmax;
1077
char *tmp;
1078
errno = 0;
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1083
if(debug){
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1086
}
1087
free(flagstring);
1088
return 0;
1089
}
1090
free(flagstring);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1092
/* Reject the loopback device */
1093
if(flags & IFF_LOOPBACK){
1094
if(debug){
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
if_entry->d_name);
1097
}
1098
return 0;
1099
}
1100
/* Accept point-to-point devices only if connect_to is specified */
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1102
if(debug){
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
if_entry->d_name);
1105
}
1106
return 1;
1107
}
1108
/* Otherwise, reject non-broadcast-capable devices */
1109
if(not (flags & IFF_BROADCAST)){
1110
if(debug){
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
if_entry->d_name);
1113
}
1114
return 0;
1115
}
1116
/* Reject non-ARP interfaces (including dummy interfaces) */
1117
if(flags & IFF_NOARP){
1118
if(debug){
1119
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1120
if_entry->d_name);
1121
}
1122
return 0;
1123
}
1124
/* Accept this device */
1125
if(debug){
1126
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1127
if_entry->d_name);
1128
}
1129
return 1;
2221
struct timespec sleeptime = { .tv_nsec = 250000000 };
2222
ret = nanosleep(&sleeptime, NULL);
2223
if(ret == -1 and errno != EINTR){
2224
perror_plus("nanosleep");
2225
}
2226
}
2227
2228
errno = old_errno;
2229
return 0;
2230
}
2231
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2235
struct ifreq network;
2236
unsigned int if_index = if_nametoindex(interface);
2237
if(if_index == 0){
2238
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2239
errno = old_errno;
2240
return ENXIO;
2241
}
2242
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network) and debug){
2246
ret_errno = errno;
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
return ret_errno;
2251
}
2252
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2253
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
2256
ret_errno = errno;
2257
perror_plus("socket");
2258
errno = old_errno;
2259
return ret_errno;
2260
}
2261
2262
if(debug){
2263
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2264
interface);
2265
}
2266
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2269
if(ret_errno != 0){
2270
errno = ret_errno;
2271
perror_plus("Failed to raise privileges");
2272
}
2273
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2276
2277
/* If raise_privileges() succeeded above */
2278
if(ret_errno == 0){
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("Failed to lower privileges");
2284
}
2285
}
2286
2287
/* Close the socket */
2288
int ret = close(sd);
2289
if(ret == -1){
2290
perror_plus("close");
2291
}
2292
2293
if(ret_setflags == -1){
2294
errno = ioctl_errno;
2295
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2296
errno = old_errno;
2297
return ioctl_errno;
2298
}
2299
} else if(debug){
2300
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2301
interface);
2302
}
2303
2304
errno = old_errno;
2305
return 0;
1130
2306
}
1131
2307
1132
2308
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
1133
2314
AvahiSServiceBrowser *sb = NULL;
1134
int error;
2315
error_t ret_errno;
1135
2316
int ret;
1136
2317
intmax_t tmpmax;
1137
2318
char *tmp;
1138
2319
int exitcode = EXIT_SUCCESS;
1139
const char *interface = "";
1140
struct ifreq network;
1141
int sd = -1;
1142
bool take_down_interface = false;
1143
uid_t uid;
1144
gid_t gid;
1145
char tempdir[] = "/tmp/mandosXXXXXX";
1146
bool tempdir_created = false;
2320
char *interfaces_to_take_down = NULL;
2321
size_t interfaces_to_take_down_size = 0;
2322
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2323
char old_tempdir[] = "/tmp/mandosXXXXXX";
2324
char *tempdir = NULL;
1147
2325
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1148
2326
const char *seckey = PATHDIR "/" SECKEY;
1149
2327
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
char *interfaces_hooks = NULL;
1150
2330
1151
2331
bool gnutls_initialized = false;
1152
2332
bool gpgme_initialized = false;
1153
2333
float delay = 2.5f;
2334
double retry_interval = 10; /* 10s between trying a server and
2335
retrying the same server again */
1154
2336
1155
2337
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1156
2338
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1162
2344
errno = 0;
1163
2345
ret = setgid(gid);
1164
2346
if(ret == -1){
1165
perror("setgid");
2347
perror_plus("setgid");
1166
2348
}
1167
2349
1168
2350
/* Lower user privileges (temporarily) */
1169
2351
errno = 0;
1170
2352
ret = seteuid(uid);
1171
2353
if(ret == -1){
1172
perror("seteuid");
2354
perror_plus("seteuid");
1173
2355
}
1174
2356
1175
2357
if(quit_now){
1202
2384
.doc = "Bit length of the prime number used in the"
1203
2385
" Diffie-Hellman key exchange",
1204
2386
.group = 2 },
2387
{ .name = "dh-params", .key = 134,
2388
.arg = "FILE",
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2391
.group = 2 },
1205
2392
{ .name = "priority", .key = 130,
1206
2393
.arg = "STRING",
1207
2394
.doc = "GnuTLS priority string for the TLS handshake",
1210
2397
.arg = "SECONDS",
1211
2398
.doc = "Maximum delay to wait for interface startup",
1212
2399
.group = 2 },
2400
{ .name = "retry", .key = 132,
2401
.arg = "SECONDS",
2402
.doc = "Retry interval used when denied by the Mandos server",
2403
.group = 2 },
2404
{ .name = "network-hook-dir", .key = 133,
2405
.arg = "DIR",
2406
.doc = "Directory where network hooks are located",
2407
.group = 2 },
1213
2408
/*
1214
2409
* These reproduce what we would get without ARGP_NO_HELP
1215
2410
*/
1233
2428
connect_to = arg;
1234
2429
break;
1235
2430
case 'i': /* --interface */
1236
interface = arg;
2431
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2432
arg, (int)',');
2433
if(ret_errno != 0){
2434
argp_error(state, "%s", strerror(ret_errno));
2435
}
1237
2436
break;
1238
2437
case 's': /* --seckey */
1239
2438
seckey = arg;
1250
2449
}
1251
2450
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1252
2451
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
1253
2455
case 130: /* --priority */
1254
2456
mc.priority = arg;
1255
2457
break;
1259
2461
if(errno != 0 or tmp == arg or *tmp != '\0'){
1260
2462
argp_error(state, "Bad delay");
1261
2463
}
2464
case 132: /* --retry */
2465
errno = 0;
2466
retry_interval = strtod(arg, &tmp);
2467
if(errno != 0 or tmp == arg or *tmp != '\0'
2468
or (retry_interval * 1000) > INT_MAX
2469
or retry_interval < 0){
2470
argp_error(state, "Bad retry interval");
2471
}
2472
break;
2473
case 133: /* --network-hook-dir */
2474
hookdir = arg;
1262
2475
break;
1263
2476
/*
1264
2477
* These reproduce what we would get without ARGP_NO_HELP
1271
2484
argp_state_help(state, state->out_stream,
1272
2485
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1273
2486
case 'V': /* --version */
1274
fprintf(state->out_stream, "%s\n", argp_program_version);
2487
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1275
2488
exit(argp_err_exit_status);
1276
2489
break;
1277
2490
default:
1284
2497
.args_doc = "",
1285
2498
.doc = "Mandos client -- Get and decrypt"
1286
2499
" passwords from a Mandos server" };
1287
ret = argp_parse(&argp, argc, argv,
1288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1289
switch(ret){
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
1290
2503
case 0:
1291
2504
break;
1292
2505
case ENOMEM:
1293
2506
default:
1294
errno = ret;
1295
perror("argp_parse");
2507
errno = ret_errno;
2508
perror_plus("argp_parse");
1296
2509
exitcode = EX_OSERR;
1297
2510
goto end;
1298
2511
case EINVAL:
1301
2514
}
1302
2515
}
1303
2516
2517
{
2518
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
2520
2521
/* Re-raise privileges */
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2525
perror_plus("Failed to raise privileges");
2526
} else {
2527
struct stat st;
2528
2529
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2530
int seckey_fd = open(seckey, O_RDONLY);
2531
if(seckey_fd == -1){
2532
perror_plus("open");
2533
} else {
2534
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2535
if(ret == -1){
2536
perror_plus("fstat");
2537
} else {
2538
if(S_ISREG(st.st_mode)
2539
and st.st_uid == 0 and st.st_gid == 0){
2540
ret = fchown(seckey_fd, uid, gid);
2541
if(ret == -1){
2542
perror_plus("fchown");
2543
}
2544
}
2545
}
2546
close(seckey_fd);
2547
}
2548
}
2549
2550
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2551
int pubkey_fd = open(pubkey, O_RDONLY);
2552
if(pubkey_fd == -1){
2553
perror_plus("open");
2554
} else {
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2556
if(ret == -1){
2557
perror_plus("fstat");
2558
} else {
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(pubkey_fd, uid, gid);
2562
if(ret == -1){
2563
perror_plus("fchown");
2564
}
2565
}
2566
}
2567
close(pubkey_fd);
2568
}
2569
}
2570
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2576
} else {
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2578
if(ret == -1){
2579
perror_plus("fstat");
2580
} else {
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2584
if(ret == -1){
2585
perror_plus("fchown");
2586
}
2587
}
2588
}
2589
close(dhparams_fd);
2590
}
2591
}
2592
2593
/* Lower privileges */
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2597
perror_plus("Failed to lower privileges");
2598
}
2599
}
2600
}
2601
2602
/* Remove invalid interface names (except "none") */
2603
{
2604
char *interface = NULL;
2605
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2606
interface))){
2607
if(strcmp(interface, "none") != 0
2608
and if_nametoindex(interface) == 0){
2609
if(interface[0] != '\0'){
2610
fprintf_plus(stderr, "Not using nonexisting interface"
2611
" \"%s\"\n", interface);
2612
}
2613
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2614
interface = NULL;
2615
}
2616
}
2617
}
2618
2619
/* Run network hooks */
2620
{
2621
if(mc.interfaces != NULL){
2622
interfaces_hooks = malloc(mc.interfaces_size);
2623
if(interfaces_hooks == NULL){
2624
perror_plus("malloc");
2625
goto end;
2626
}
2627
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2628
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2629
}
2630
run_network_hooks("start", interfaces_hooks != NULL ?
2631
interfaces_hooks : "", delay);
2632
}
2633
1304
2634
if(not debug){
1305
2635
avahi_set_log_function(empty_log);
1306
2636
}
1307
1308
if(interface[0] == '\0'){
1309
struct dirent **direntries;
1310
ret = scandir(sys_class_net, &direntries, good_interface,
1311
alphasort);
1312
if(ret >= 1){
1313
/* Pick the first good interface */
1314
interface = strdup(direntries[0]->d_name);
1315
if(debug){
1316
fprintf(stderr, "Using interface \"%s\"\n", interface);
1317
}
1318
if(interface == NULL){
1319
perror("malloc");
1320
free(direntries);
1321
exitcode = EXIT_FAILURE;
1322
goto end;
1323
}
1324
free(direntries);
1325
} else {
1326
free(direntries);
1327
fprintf(stderr, "Could not find a network interface\n");
1328
exitcode = EXIT_FAILURE;
1329
goto end;
1330
}
1331
}
1332
2637
1333
2638
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1334
2639
from the signal handler */
1335
2640
/* Initialize the pseudo-RNG for Avahi */
1336
2641
srand((unsigned int) time(NULL));
1337
mc.simple_poll = avahi_simple_poll_new();
1338
if(mc.simple_poll == NULL){
1339
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2642
simple_poll = avahi_simple_poll_new();
2643
if(simple_poll == NULL){
2644
fprintf_plus(stderr,
2645
"Avahi: Failed to create simple poll object.\n");
1340
2646
exitcode = EX_UNAVAILABLE;
1341
2647
goto end;
1342
2648
}
1344
2650
sigemptyset(&sigterm_action.sa_mask);
1345
2651
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1346
2652
if(ret == -1){
1347
perror("sigaddset");
2653
perror_plus("sigaddset");
1348
2654
exitcode = EX_OSERR;
1349
2655
goto end;
1350
2656
}
1351
2657
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1352
2658
if(ret == -1){
1353
perror("sigaddset");
2659
perror_plus("sigaddset");
1354
2660
exitcode = EX_OSERR;
1355
2661
goto end;
1356
2662
}
1357
2663
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1358
2664
if(ret == -1){
1359
perror("sigaddset");
2665
perror_plus("sigaddset");
1360
2666
exitcode = EX_OSERR;
1361
2667
goto end;
1362
2668
}
1366
2672
*/
1367
2673
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1368
2674
if(ret == -1){
1369
perror("sigaction");
2675
perror_plus("sigaction");
1370
2676
return EX_OSERR;
1371
2677
}
1372
2678
if(old_sigterm_action.sa_handler != SIG_IGN){
1373
2679
ret = sigaction(SIGINT, &sigterm_action, NULL);
1374
2680
if(ret == -1){
1375
perror("sigaction");
2681
perror_plus("sigaction");
1376
2682
exitcode = EX_OSERR;
1377
2683
goto end;
1378
2684
}
1379
2685
}
1380
2686
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1381
2687
if(ret == -1){
1382
perror("sigaction");
2688
perror_plus("sigaction");
1383
2689
return EX_OSERR;
1384
2690
}
1385
2691
if(old_sigterm_action.sa_handler != SIG_IGN){
1386
2692
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1387
2693
if(ret == -1){
1388
perror("sigaction");
2694
perror_plus("sigaction");
1389
2695
exitcode = EX_OSERR;
1390
2696
goto end;
1391
2697
}
1392
2698
}
1393
2699
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1394
2700
if(ret == -1){
1395
perror("sigaction");
2701
perror_plus("sigaction");
1396
2702
return EX_OSERR;
1397
2703
}
1398
2704
if(old_sigterm_action.sa_handler != SIG_IGN){
1399
2705
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1400
2706
if(ret == -1){
1401
perror("sigaction");
1402
exitcode = EX_OSERR;
1403
goto end;
1404
}
1405
}
1406
1407
/* If the interface is down, bring it up */
1408
if(strcmp(interface, "none") != 0){
1409
if_index = (AvahiIfIndex) if_nametoindex(interface);
1410
if(if_index == 0){
1411
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1412
exitcode = EX_UNAVAILABLE;
1413
goto end;
1414
}
1415
1416
if(quit_now){
1417
goto end;
1418
}
1419
1420
/* Re-raise priviliges */
1421
errno = 0;
1422
ret = seteuid(0);
1423
if(ret == -1){
1424
perror("seteuid");
1425
}
1426
1427
#ifdef __linux__
1428
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1429
messages about the network interface to mess up the prompt */
1430
ret = klogctl(8, NULL, 5);
1431
bool restore_loglevel = true;
1432
if(ret == -1){
1433
restore_loglevel = false;
1434
perror("klogctl");
1435
}
1436
#endif /* __linux__ */
1437
1438
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1439
if(sd < 0){
1440
perror("socket");
1441
exitcode = EX_OSERR;
1442
#ifdef __linux__
1443
if(restore_loglevel){
1444
ret = klogctl(7, NULL, 0);
1445
if(ret == -1){
1446
perror("klogctl");
1447
}
1448
}
1449
#endif /* __linux__ */
1450
/* Lower privileges */
1451
errno = 0;
1452
ret = seteuid(uid);
1453
if(ret == -1){
1454
perror("seteuid");
1455
}
1456
goto end;
1457
}
1458
strcpy(network.ifr_name, interface);
1459
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1460
if(ret == -1){
1461
perror("ioctl SIOCGIFFLAGS");
1462
#ifdef __linux__
1463
if(restore_loglevel){
1464
ret = klogctl(7, NULL, 0);
1465
if(ret == -1){
1466
perror("klogctl");
1467
}
1468
}
1469
#endif /* __linux__ */
1470
exitcode = EX_OSERR;
1471
/* Lower privileges */
1472
errno = 0;
1473
ret = seteuid(uid);
1474
if(ret == -1){
1475
perror("seteuid");
1476
}
1477
goto end;
1478
}
1479
if((network.ifr_flags & IFF_UP) == 0){
1480
network.ifr_flags |= IFF_UP;
1481
take_down_interface = true;
1482
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1483
if(ret == -1){
1484
take_down_interface = false;
1485
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1486
exitcode = EX_OSERR;
1487
#ifdef __linux__
1488
if(restore_loglevel){
1489
ret = klogctl(7, NULL, 0);
1490
if(ret == -1){
1491
perror("klogctl");
2707
perror_plus("sigaction");
2708
exitcode = EX_OSERR;
2709
goto end;
2710
}
2711
}
2712
2713
/* If no interfaces were specified, make a list */
2714
if(mc.interfaces == NULL){
2715
struct dirent **direntries = NULL;
2716
/* Look for any good interfaces */
2717
ret = scandir(sys_class_net, &direntries, good_interface,
2718
alphasort);
2719
if(ret >= 1){
2720
/* Add all found interfaces to interfaces list */
2721
for(int i = 0; i < ret; ++i){
2722
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2723
direntries[i]->d_name);
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("argz_add");
2727
free(direntries[i]);
2728
continue;
2729
}
2730
if(debug){
2731
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2732
direntries[i]->d_name);
2733
}
2734
free(direntries[i]);
2735
}
2736
free(direntries);
2737
} else {
2738
if(ret == 0){
2739
free(direntries);
2740
}
2741
fprintf_plus(stderr, "Could not find a network interface\n");
2742
exitcode = EXIT_FAILURE;
2743
goto end;
2744
}
2745
}
2746
2747
/* Bring up interfaces which are down, and remove any "none"s */
2748
{
2749
char *interface = NULL;
2750
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2751
interface))){
2752
/* If interface name is "none", stop bringing up interfaces.
2753
Also remove all instances of "none" from the list */
2754
if(strcmp(interface, "none") == 0){
2755
argz_delete(&mc.interfaces, &mc.interfaces_size,
2756
interface);
2757
interface = NULL;
2758
while((interface = argz_next(mc.interfaces,
2759
mc.interfaces_size, interface))){
2760
if(strcmp(interface, "none") == 0){
2761
argz_delete(&mc.interfaces, &mc.interfaces_size,
2762
interface);
2763
interface = NULL;
1492
2764
}
1493
2765
}
1494
#endif /* __linux__ */
1495
/* Lower privileges */
1496
errno = 0;
1497
ret = seteuid(uid);
1498
if(ret == -1){
1499
perror("seteuid");
1500
}
1501
goto end;
1502
}
1503
}
1504
/* sleep checking until interface is running */
1505
for(int i=0; i < delay * 4; i++){
1506
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1507
if(ret == -1){
1508
perror("ioctl SIOCGIFFLAGS");
1509
} else if(network.ifr_flags & IFF_RUNNING){
1510
2766
break;
1511
2767
}
1512
struct timespec sleeptime = { .tv_nsec = 250000000 };
1513
ret = nanosleep(&sleeptime, NULL);
1514
if(ret == -1 and errno != EINTR){
1515
perror("nanosleep");
1516
}
1517
}
1518
if(not take_down_interface){
1519
/* We won't need the socket anymore */
1520
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1521
if(ret == -1){
1522
perror("close");
1523
}
1524
}
1525
#ifdef __linux__
1526
if(restore_loglevel){
1527
/* Restores kernel loglevel to default */
1528
ret = klogctl(7, NULL, 0);
1529
if(ret == -1){
1530
perror("klogctl");
1531
}
1532
}
1533
#endif /* __linux__ */
1534
/* Lower privileges */
1535
errno = 0;
1536
if(take_down_interface){
1537
/* Lower privileges */
1538
ret = seteuid(uid);
1539
if(ret == -1){
1540
perror("seteuid");
1541
}
1542
} else {
1543
/* Lower privileges permanently */
1544
ret = setuid(uid);
1545
if(ret == -1){
1546
perror("setuid");
1547
}
1548
}
2768
bool interface_was_up = interface_is_up(interface);
2769
errno = bring_up_interface(interface, delay);
2770
if(not interface_was_up){
2771
if(errno != 0){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2774
} else {
2775
errno = argz_add(&interfaces_to_take_down,
2776
&interfaces_to_take_down_size,
2777
interface);
2778
if(errno != 0){
2779
perror_plus("argz_add");
2780
}
2781
}
2782
}
2783
}
2784
if(debug and (interfaces_to_take_down == NULL)){
2785
fprintf_plus(stderr, "No interfaces were brought up\n");
2786
}
2787
}
2788
2789
/* If we only got one interface, explicitly use only that one */
2790
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2791
if(debug){
2792
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2793
mc.interfaces);
2794
}
2795
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1549
2796
}
1550
2797
1551
2798
if(quit_now){
1552
2799
goto end;
1553
2800
}
1554
2801
1555
ret = init_gnutls_global(pubkey, seckey);
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1556
2803
if(ret == -1){
1557
fprintf(stderr, "init_gnutls_global failed\n");
2804
fprintf_plus(stderr, "init_gnutls_global failed\n");
1558
2805
exitcode = EX_UNAVAILABLE;
1559
2806
goto end;
1560
2807
} else {
1565
2812
goto end;
1566
2813
}
1567
2814
1568
tempdir_created = true;
1569
if(mkdtemp(tempdir) == NULL){
1570
tempdir_created = false;
1571
perror("mkdtemp");
2815
/* Try /run/tmp before /tmp */
2816
tempdir = mkdtemp(run_tempdir);
2817
if(tempdir == NULL and errno == ENOENT){
2818
if(debug){
2819
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2820
run_tempdir, old_tempdir);
2821
}
2822
tempdir = mkdtemp(old_tempdir);
2823
}
2824
if(tempdir == NULL){
2825
perror_plus("mkdtemp");
1572
2826
goto end;
1573
2827
}
1574
2828
1576
2830
goto end;
1577
2831
}
1578
2832
1579
if(not init_gpgme(pubkey, seckey, tempdir)){
1580
fprintf(stderr, "init_gpgme failed\n");
2833
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2834
fprintf_plus(stderr, "init_gpgme failed\n");
1581
2835
exitcode = EX_UNAVAILABLE;
1582
2836
goto end;
1583
2837
} else {
1592
2846
/* Connect directly, do not use Zeroconf */
1593
2847
/* (Mainly meant for debugging) */
1594
2848
char *address = strrchr(connect_to, ':');
2849
1595
2850
if(address == NULL){
1596
fprintf(stderr, "No colon in address\n");
2851
fprintf_plus(stderr, "No colon in address\n");
1597
2852
exitcode = EX_USAGE;
1598
2853
goto end;
1599
2854
}
1602
2857
goto end;
1603
2858
}
1604
2859
1605
uint16_t port;
2860
in_port_t port;
1606
2861
errno = 0;
1607
2862
tmpmax = strtoimax(address+1, &tmp, 10);
1608
2863
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1609
or tmpmax != (uint16_t)tmpmax){
1610
fprintf(stderr, "Bad port number\n");
2864
or tmpmax != (in_port_t)tmpmax){
2865
fprintf_plus(stderr, "Bad port number\n");
1611
2866
exitcode = EX_USAGE;
1612
2867
goto end;
1613
2868
}
1614
2869
1615
2870
if(quit_now){
1616
2871
goto end;
1617
2872
}
1618
2873
1619
port = (uint16_t)tmpmax;
2874
port = (in_port_t)tmpmax;
1620
2875
*address = '\0';
1621
address = connect_to;
1622
2876
/* Colon in address indicates IPv6 */
1623
2877
int af;
1624
if(strchr(address, ':') != NULL){
2878
if(strchr(connect_to, ':') != NULL){
1625
2879
af = AF_INET6;
2880
/* Accept [] around IPv6 address - see RFC 5952 */
2881
if(connect_to[0] == '[' and address[-1] == ']')
2882
{
2883
connect_to++;
2884
address[-1] = '\0';
2885
}
1626
2886
} else {
1627
2887
af = AF_INET;
1628
2888
}
2889
address = connect_to;
1629
2890
1630
2891
if(quit_now){
1631
2892
goto end;
1632
2893
}
1633
2894
1634
2895
while(not quit_now){
1635
ret = start_mandos_communication(address, port, if_index, af);
2896
ret = start_mandos_communication(address, port, if_index, af,
2897
&mc);
1636
2898
if(quit_now or ret == 0){
1637
2899
break;
1638
2900
}
1639
sleep(15);
1640
};
1641
1642
if (not quit_now){
2901
if(debug){
2902
fprintf_plus(stderr, "Retrying in %d seconds\n",
2903
(int)retry_interval);
2904
}
2905
sleep((unsigned int)retry_interval);
2906
}
2907
2908
if(not quit_now){
1643
2909
exitcode = EXIT_SUCCESS;
1644
2910
}
1645
2911
1646
2912
goto end;
1647
2913
}
1648
2914
1660
2926
config.publish_domain = 0;
1661
2927
1662
2928
/* Allocate a new server */
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
2929
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
1666
2931
1667
2932
/* Free the Avahi configuration data */
1668
2933
avahi_server_config_free(&config);
1670
2935
1671
2936
/* Check if creating the Avahi server object succeeded */
1672
2937
if(mc.server == NULL){
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
2938
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
1675
2940
exitcode = EX_UNAVAILABLE;
1676
2941
goto end;
1677
2942
}
1683
2948
/* Create the Avahi service browser */
1684
2949
sb = avahi_s_service_browser_new(mc.server, if_index,
1685
2950
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
NULL, 0, browse_callback, NULL);
2951
NULL, 0, browse_callback,
2952
(void *)&mc);
1687
2953
if(sb == NULL){
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
2954
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2955
avahi_strerror(avahi_server_errno(mc.server)));
1690
2956
exitcode = EX_UNAVAILABLE;
1691
2957
goto end;
1692
2958
}
1698
2964
/* Run the main loop */
1699
2965
1700
2966
if(debug){
1701
fprintf(stderr, "Starting Avahi loop search\n");
2967
fprintf_plus(stderr, "Starting Avahi loop search\n");
1702
2968
}
1703
2969
1704
avahi_simple_poll_loop(mc.simple_poll);
2970
ret = avahi_loop_with_timeout(simple_poll,
2971
(int)(retry_interval * 1000), &mc);
2972
if(debug){
2973
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2974
(ret == 0) ? "successfully" : "with error");
2975
}
1705
2976
1706
2977
end:
1707
2978
1708
2979
if(debug){
1709
fprintf(stderr, "%s exiting\n", argv[0]);
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
1710
2987
}
1711
2988
1712
2989
/* Cleanup things */
2990
free(mc.interfaces);
2991
1713
2992
if(sb != NULL)
1714
2993
avahi_s_service_browser_free(sb);
1715
2994
1716
2995
if(mc.server != NULL)
1717
2996
avahi_server_free(mc.server);
1718
2997
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
2998
if(simple_poll != NULL)
2999
avahi_simple_poll_free(simple_poll);
1721
3000
1722
3001
if(gnutls_initialized){
1723
3002
gnutls_certificate_free_credentials(mc.cred);
1724
gnutls_global_deinit();
1725
3003
gnutls_dh_params_deinit(mc.dh_params);
1726
3004
}
1727
3005
1729
3007
gpgme_release(mc.ctx);
1730
3008
}
1731
3009
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
direntry->d_name);
1789
if(ret < 0){
1790
perror("asprintf");
1791
continue;
1792
}
1793
ret = remove(fullname);
1794
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
1797
}
1798
free(fullname);
1799
}
1800
closedir(d);
1801
}
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
1805
}
3010
/* Cleans up the circular linked list of Mandos servers the client
3011
has seen */
3012
if(mc.current_server != NULL){
3013
mc.current_server->prev->next = NULL;
3014
while(mc.current_server != NULL){
3015
server *next = mc.current_server->next;
3016
#ifdef __GNUC__
3017
#pragma GCC diagnostic push
3018
#pragma GCC diagnostic ignored "-Wcast-qual"
3019
#endif
3020
free((char *)(mc.current_server->ip));
3021
#ifdef __GNUC__
3022
#pragma GCC diagnostic pop
3023
#endif
3024
free(mc.current_server);
3025
mc.current_server = next;
3026
}
3027
}
3028
3029
/* Re-raise privileges */
3030
{
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to raise privileges");
3035
} else {
3036
3037
/* Run network hooks */
3038
run_network_hooks("stop", interfaces_hooks != NULL ?
3039
interfaces_hooks : "", delay);
3040
3041
/* Take down the network interfaces which were brought up */
3042
{
3043
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to take down interface");
3051
}
3052
}
3053
if(debug and (interfaces_to_take_down == NULL)){
3054
fprintf_plus(stderr, "No interfaces needed to be taken"
3055
" down\n");
3056
}
3057
}
3058
}
3059
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
3063
perror_plus("Failed to lower privileges permanently");
3064
}
3065
}
3066
3067
free(interfaces_to_take_down);
3068
free(interfaces_hooks);
3069
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
3072
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
3086
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
3124
/* Removes the GPGME temp directory and all files inside */
3125
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
1806
3127
}
1807
3128
1808
3129
if(quit_now){
1812
3133
&old_sigterm_action,
1813
3134
NULL));
1814
3135
if(ret == -1){
1815
perror("sigaction");
3136
perror_plus("sigaction");
1816
3137
}
1817
3138
do {
1818
3139
ret = raise(signal_received);
1819
3140
} while(ret != 0 and errno == EINTR);
1820
3141
if(ret != 0){
1821
perror("raise");
3142
perror_plus("raise");
1822
3143
abort();
1823
3144
}
1824
3145
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0