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- Committer: Teddy Hogeborn
- Date: 2018-04-01 19:27:30 UTC
- 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:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
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
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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 */
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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 */
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#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 */
66
#include <time.h> /* nanosleep(), time() */
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 */
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
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SIOCSIFFLAGS, if_indextoname(),
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76
if_nametoindex(), IF_NAMESIZE */
72
79
*/
73
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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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() */
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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,
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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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104
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#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
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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>";
148
static const char sys_class_net[] = "/sys/class/net";
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;
130
165
131
166
/* Used for passing in values through the Avahi callback functions */
132
167
typedef struct {
133
AvahiSimplePoll *simple_poll;
134
168
AvahiServer *server;
135
169
gnutls_certificate_credentials_t cred;
136
170
unsigned int dh_bits;
137
171
gnutls_dh_params_t dh_params;
138
172
const char *priority;
139
173
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
140
177
} mandos_context;
141
178
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
146
181
147
182
sig_atomic_t quit_now = 0;
148
183
int signal_received = 0;
149
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
150
204
/*
151
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
206
* bytes. "buffer_capacity" is how much is currently allocated,
153
207
* "buffer_length" is how much is already used.
154
208
*/
209
__attribute__((nonnull, warn_unused_result))
155
210
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
211
size_t buffer_capacity){
157
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
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;
160
219
return 0;
161
220
}
221
*buffer = new_buf;
162
222
buffer_capacity += BUFFER_SIZE;
163
223
}
164
224
return buffer_capacity;
165
225
}
166
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
167
275
/*
168
276
* Initialize GPGME.
169
277
*/
170
static bool init_gpgme(const char *seckey,
171
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){
172
283
gpgme_error_t rc;
173
284
gpgme_engine_info_t engine_info;
174
285
175
176
286
/*
177
287
* Helper function to insert pub and seckey to the engine keyring.
178
288
*/
179
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
180
290
int ret;
181
291
int fd;
182
292
gpgme_data_t pgp_data;
183
293
184
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
295
if(fd == -1){
186
perror("open");
296
perror_plus("open");
187
297
return false;
188
298
}
189
299
190
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
301
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
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));
194
304
return false;
195
305
}
196
306
197
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
198
308
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
201
311
return false;
202
312
}
203
313
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
205
315
if(ret == -1){
206
perror("close");
316
perror_plus("close");
207
317
}
208
318
gpgme_data_release(pgp_data);
209
319
return true;
210
320
}
211
321
212
322
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
323
fprintf_plus(stderr, "Initializing GPGME\n");
214
324
}
215
325
216
326
/* Init GPGME */
217
327
gpgme_check_version(NULL);
218
328
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
329
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
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));
222
332
return false;
223
333
}
224
334
225
/* Set GPGME home directory for the OpenPGP engine only */
335
/* Set GPGME home directory for the OpenPGP engine only */
226
336
rc = gpgme_get_engine_info(&engine_info);
227
337
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
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));
230
340
return false;
231
341
}
232
342
while(engine_info != NULL){
238
348
engine_info = engine_info->next;
239
349
}
240
350
if(engine_info == NULL){
241
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);
242
353
return false;
243
354
}
244
355
245
356
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
247
358
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
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));
250
362
return false;
251
363
}
252
364
261
373
* Decrypt OpenPGP data.
262
374
* Returns -1 on error
263
375
*/
376
__attribute__((nonnull, warn_unused_result))
264
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
378
size_t crypto_size,
266
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
267
381
gpgme_data_t dh_crypto, dh_plain;
268
382
gpgme_error_t rc;
269
383
ssize_t ret;
271
385
ssize_t plaintext_length = 0;
272
386
273
387
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
389
}
276
390
277
391
/* Create new GPGME data buffer from memory cryptotext */
278
392
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
393
0);
280
394
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
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));
283
397
return -1;
284
398
}
285
399
286
400
/* Create new empty GPGME data buffer for the plaintext */
287
401
rc = gpgme_data_new(&dh_plain);
288
402
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
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));
291
406
gpgme_data_release(dh_crypto);
292
407
return -1;
293
408
}
294
409
295
410
/* Decrypt data from the cryptotext data buffer to the plaintext
296
411
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
413
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
301
416
plaintext_length = -1;
302
417
if(debug){
303
418
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
305
420
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
422
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
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);
312
429
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
430
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
431
}
315
432
gpgme_recipient_t recipient;
316
433
recipient = result->recipients;
317
434
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "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");
324
442
recipient = recipient->next;
325
443
}
326
444
}
329
447
}
330
448
331
449
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
450
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
451
}
334
452
335
453
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
454
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
455
perror_plus("gpgme_data_seek");
338
456
plaintext_length = -1;
339
457
goto decrypt_end;
340
458
}
342
460
*plaintext = NULL;
343
461
while(true){
344
462
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
463
(size_t)plaintext_length,
464
plaintext_capacity);
347
465
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
466
perror_plus("incbuffer");
467
plaintext_length = -1;
468
goto decrypt_end;
351
469
}
352
470
353
471
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
476
break;
359
477
}
360
478
if(ret < 0){
361
perror("gpgme_data_read");
479
perror_plus("gpgme_data_read");
362
480
plaintext_length = -1;
363
481
goto decrypt_end;
364
482
}
366
484
}
367
485
368
486
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
487
fprintf_plus(stderr, "Decrypted password is: ");
370
488
for(ssize_t i = 0; i < plaintext_length; i++){
371
489
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
490
}
383
501
return plaintext_length;
384
502
}
385
503
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
389
if(ret == NULL)
390
ret = "(unknown)";
391
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);
392
515
}
393
516
394
517
/* GnuTLS log function callback */
518
__attribute__((nonnull))
395
519
static void debuggnutls(__attribute__((unused)) int level,
396
520
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
521
fprintf_plus(stderr, "GnuTLS: %s", string);
398
522
}
399
523
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
400
525
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
526
const char *seckeyfilename,
527
const char *dhparamsfilename,
528
mandos_context *mc){
402
529
int ret;
530
unsigned int uret;
403
531
404
532
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
406
}
407
408
ret = gnutls_global_init();
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
412
return -1;
533
fprintf_plus(stderr, "Initializing GnuTLS\n");
413
534
}
414
535
415
536
if(debug){
421
542
}
422
543
423
544
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
545
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
546
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
431
gnutls_global_deinit();
547
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
safer_gnutls_strerror(ret));
432
549
return -1;
433
550
}
434
551
435
552
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
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);
439
557
}
440
558
441
559
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
443
561
GNUTLS_OPENPGP_FMT_BASE64);
444
562
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
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));
450
568
goto globalfail;
451
569
}
452
570
453
571
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
458
goto globalfail;
459
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
464
goto globalfail;
465
}
466
467
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);
468
757
469
758
return 0;
470
759
471
760
globalfail:
472
761
473
gnutls_certificate_free_credentials(mc.cred);
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
762
gnutls_certificate_free_credentials(mc->cred);
763
gnutls_dh_params_deinit(mc->dh_params);
476
764
return -1;
477
765
}
478
766
479
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){
480
770
int ret;
481
771
/* GnuTLS session creation */
482
772
do {
486
776
}
487
777
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
778
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
779
fprintf_plus(stderr,
780
"Error in GnuTLS session initialization: %s\n",
781
safer_gnutls_strerror(ret));
491
782
}
492
783
493
784
{
494
785
const char *err;
495
786
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
787
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
788
if(quit_now){
498
789
gnutls_deinit(*session);
499
790
return -1;
500
791
}
501
792
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
793
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
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));
506
797
gnutls_deinit(*session);
507
798
return -1;
508
799
}
510
801
511
802
do {
512
803
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
804
mc->cred);
514
805
if(quit_now){
515
806
gnutls_deinit(*session);
516
807
return -1;
517
808
}
518
809
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
810
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
811
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
812
safer_gnutls_strerror(ret));
522
813
gnutls_deinit(*session);
523
814
return -1;
524
815
}
526
817
/* ignore client certificate if any. */
527
818
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
819
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
530
531
820
return 0;
532
821
}
533
822
535
824
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
536
825
__attribute__((unused)) const char *txt){}
537
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
538
1045
/* Called when a Mandos server is found */
539
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,
540
1048
AvahiIfIndex if_index,
541
int af){
1049
int af, mandos_context *mc){
542
1050
int ret, tcp_sd = -1;
543
1051
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
1052
struct sockaddr_storage to;
548
1053
char *buffer = NULL;
549
1054
char *decrypted_buffer = NULL;
550
1055
size_t buffer_length = 0;
553
1058
int retval = -1;
554
1059
gnutls_session_t session;
555
1060
int pf; /* Protocol family */
1061
bool route_added = false;
556
1062
557
1063
errno = 0;
558
1064
569
1075
pf = PF_INET;
570
1076
break;
571
1077
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
1078
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
1079
errno = EINVAL;
574
1080
return -1;
575
1081
}
576
1082
577
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);
578
1117
if(ret != 0){
579
1118
return -1;
580
1119
}
581
1120
582
1121
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
1122
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1123
PRIuMAX "\n", ip, (uintmax_t)port);
585
1124
}
586
1125
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
588
1127
if(tcp_sd < 0){
589
1128
int e = errno;
590
perror("socket");
1129
perror_plus("socket");
591
1130
errno = e;
592
1131
goto mandos_end;
593
1132
}
597
1136
goto mandos_end;
598
1137
}
599
1138
600
memset(&to, 0, sizeof(to));
601
1139
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
603
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);
604
1143
} else { /* IPv4 */
605
to.in.sin_family = (sa_family_t)af;
606
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);
607
1147
}
608
1148
if(ret < 0 ){
609
1149
int e = errno;
610
perror("inet_pton");
1150
perror_plus("inet_pton");
611
1151
errno = e;
612
1152
goto mandos_end;
613
1153
}
614
1154
if(ret == 0){
615
1155
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
1156
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
1157
errno = e;
618
1158
goto mandos_end;
619
1159
}
620
1160
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
628
1164
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
1165
fprintf_plus(stderr, "An IPv6 link-local address is"
1166
" incomplete without a network interface\n");
631
1167
errno = EINVAL;
632
1168
goto mandos_end;
633
1169
}
634
1170
/* Set the network interface number as scope */
635
to.in6.sin6_scope_id = (uint32_t)if_index;
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
636
1172
}
637
1173
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
641
1175
}
642
1176
643
1177
if(quit_now){
649
1183
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
1184
char interface[IF_NAMESIZE];
651
1185
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
1186
perror_plus("if_indextoname");
653
1187
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
1188
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1189
"\n", ip, interface, (uintmax_t)port);
656
1190
}
657
1191
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
1192
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1193
ip, (uintmax_t)port);
660
1194
}
661
1195
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
1196
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
664
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
667
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
670
}
671
if(pcret == NULL){
672
perror("inet_ntop");
673
} else {
674
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
676
}
677
}
678
}
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
if(af == AF_INET6){
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
} else {
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
}
690
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
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;
700
1277
}
701
1278
702
1279
const char *out = mandos_protocol_version;
704
1281
while(true){
705
1282
size_t out_size = strlen(out);
706
1283
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
1284
out_size - written));
708
1285
if(ret == -1){
709
1286
int e = errno;
710
perror("write");
1287
perror_plus("write");
711
1288
errno = e;
712
1289
goto mandos_end;
713
1290
}
730
1307
}
731
1308
732
1309
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1310
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
1311
}
735
1312
736
1313
if(quit_now){
738
1315
goto mandos_end;
739
1316
}
740
1317
741
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);
742
1323
743
1324
if(quit_now){
744
1325
errno = EINTR;
755
1336
756
1337
if(ret != GNUTLS_E_SUCCESS){
757
1338
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1339
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
1340
gnutls_perror(ret);
760
1341
}
761
1342
errno = EPROTO;
765
1346
/* Read OpenPGP packet that contains the wanted password */
766
1347
767
1348
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
1349
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1350
" %s\n", ip);
770
1351
}
771
1352
772
1353
while(true){
777
1358
}
778
1359
779
1360
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
1361
buffer_capacity);
781
1362
if(buffer_capacity == 0){
782
1363
int e = errno;
783
perror("incbuffer");
1364
perror_plus("incbuffer");
784
1365
errno = e;
785
1366
goto mandos_end;
786
1367
}
810
1391
}
811
1392
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
1393
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1394
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1395
"***\n");
814
1396
gnutls_perror(ret);
815
1397
errno = EPROTO;
816
1398
goto mandos_end;
817
1399
}
818
1400
break;
819
1401
default:
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
1402
fprintf_plus(stderr, "Unknown error while reading data from"
1403
" encrypted session with Mandos server\n");
822
1404
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
1405
errno = EIO;
824
1406
goto mandos_end;
829
1411
}
830
1412
831
1413
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
1414
fprintf_plus(stderr, "Closing TLS session\n");
833
1415
}
834
1416
835
1417
if(quit_now){
847
1429
848
1430
if(buffer_length > 0){
849
1431
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
1432
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1433
&decrypted_buffer, mc);
853
1434
if(decrypted_buffer_size >= 0){
854
1435
1436
clearerr(stdout);
855
1437
written = 0;
856
1438
while(written < (size_t) decrypted_buffer_size){
857
1439
if(quit_now){
865
1447
if(ret == 0 and ferror(stdout)){
866
1448
int e = errno;
867
1449
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
1450
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1451
strerror(errno));
870
1452
}
871
1453
errno = e;
872
1454
goto mandos_end;
873
1455
}
874
1456
written += (size_t)ret;
875
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
}
876
1468
retval = 0;
877
1469
}
878
1470
}
881
1473
882
1474
mandos_end:
883
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
}
884
1482
int e = errno;
885
1483
free(decrypted_buffer);
886
1484
free(buffer);
887
1485
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1486
ret = close(tcp_sd);
889
1487
}
890
1488
if(ret == -1){
891
1489
if(e == 0){
892
1490
e = errno;
893
1491
}
894
perror("close");
1492
perror_plus("close");
895
1493
}
896
1494
gnutls_deinit(session);
1495
errno = e;
897
1496
if(quit_now){
898
e = EINTR;
1497
errno = EINTR;
899
1498
retval = -1;
900
1499
}
901
errno = e;
902
1500
}
903
1501
return retval;
904
1502
}
916
1514
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
1515
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1516
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1517
void *mc){
1518
if(r == NULL){
1519
return;
1520
}
921
1521
922
1522
/* Called whenever a service has been resolved successfully or
923
1523
timed out */
924
1524
925
1525
if(quit_now){
1526
avahi_s_service_resolver_free(r);
926
1527
return;
927
1528
}
928
1529
929
1530
switch(event){
930
1531
default:
931
1532
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
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)));
935
1538
break;
936
1539
937
1540
case AVAHI_RESOLVER_FOUND:
939
1542
char ip[AVAHI_ADDRESS_STR_MAX];
940
1543
avahi_address_snprint(ip, sizeof(ip), address);
941
1544
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
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);
945
1548
}
946
int ret = start_mandos_communication(ip, port, interface,
947
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);
948
1553
if(ret == 0){
949
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
}
950
1562
}
951
1563
}
952
1564
}
962
1574
const char *domain,
963
1575
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
1576
flags,
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1577
void *mc){
1578
if(b == NULL){
1579
return;
1580
}
967
1581
968
1582
/* Called whenever a new services becomes available on the LAN or
969
1583
is removed from the LAN */
976
1590
default:
977
1591
case AVAHI_BROWSER_FAILURE:
978
1592
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
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);
982
1597
return;
983
1598
984
1599
case AVAHI_BROWSER_NEW:
987
1602
the callback function is called the Avahi server will free the
988
1603
resolver for us. */
989
1604
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
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)));
995
1613
break;
996
1614
997
1615
case AVAHI_BROWSER_REMOVE:
1000
1618
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1619
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1620
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1621
fprintf_plus(stderr, "No Mandos server found, still"
1622
" searching...\n");
1004
1623
}
1005
1624
break;
1006
1625
}
1007
1626
}
1008
1627
1009
/* stop main loop after sigterm has been called */
1628
/* Signal handler that stops main loop after SIGTERM */
1010
1629
static void handle_sigterm(int sig){
1011
1630
if(quit_now){
1012
1631
return;
1014
1633
quit_now = 1;
1015
1634
signal_received = sig;
1016
1635
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1636
/* set main loop to exit */
1637
if(simple_poll != NULL){
1638
avahi_simple_poll_quit(simple_poll);
1639
}
1640
errno = old_errno;
1641
}
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
1722
/*
1723
* This function determines if a directory entry in /sys/class/net
1724
* corresponds to an acceptable network device.
1725
* (This function is passed to scandir(3) as a filter function.)
1726
*/
1727
__attribute__((nonnull, warn_unused_result))
1728
int good_interface(const struct dirent *if_entry){
1729
if(if_entry->d_name[0] == '.'){
1730
return 0;
1731
}
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)){
2219
break;
2220
}
2221
struct timespec sleeptime = { .tv_nsec = 250000000 };
2222
ret = nanosleep(&sleeptime, NULL);
2223
if(ret == -1 and errno != EINTR){
2224
perror_plus("nanosleep");
2225
}
2226
}
2227
2228
errno = old_errno;
2229
return 0;
2230
}
2231
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2235
struct ifreq network;
2236
unsigned int if_index = if_nametoindex(interface);
2237
if(if_index == 0){
2238
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2239
errno = old_errno;
2240
return ENXIO;
2241
}
2242
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network) and debug){
2246
ret_errno = errno;
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
return ret_errno;
2251
}
2252
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2253
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
2256
ret_errno = errno;
2257
perror_plus("socket");
2258
errno = old_errno;
2259
return ret_errno;
2260
}
2261
2262
if(debug){
2263
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2264
interface);
2265
}
2266
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2269
if(ret_errno != 0){
2270
errno = ret_errno;
2271
perror_plus("Failed to raise privileges");
2272
}
2273
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2276
2277
/* If raise_privileges() succeeded above */
2278
if(ret_errno == 0){
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("Failed to lower privileges");
2284
}
2285
}
2286
2287
/* Close the socket */
2288
int ret = close(sd);
2289
if(ret == -1){
2290
perror_plus("close");
2291
}
2292
2293
if(ret_setflags == -1){
2294
errno = ioctl_errno;
2295
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2296
errno = old_errno;
2297
return ioctl_errno;
2298
}
2299
} else if(debug){
2300
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2301
interface);
2302
}
2303
2304
errno = old_errno;
2305
return 0;
1021
2306
}
1022
2307
1023
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 };
1024
2314
AvahiSServiceBrowser *sb = NULL;
1025
int error;
2315
error_t ret_errno;
1026
2316
int ret;
1027
2317
intmax_t tmpmax;
1028
2318
char *tmp;
1029
2319
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1038
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;
1039
2325
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
2326
const char *seckey = PATHDIR "/" SECKEY;
1041
2327
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
char *interfaces_hooks = NULL;
1042
2330
1043
2331
bool gnutls_initialized = false;
1044
2332
bool gpgme_initialized = false;
1045
2333
float delay = 2.5f;
2334
double retry_interval = 10; /* 10s between trying a server and
2335
retrying the same server again */
1046
2336
1047
2337
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
2338
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
2344
errno = 0;
1055
2345
ret = setgid(gid);
1056
2346
if(ret == -1){
1057
perror("setgid");
2347
perror_plus("setgid");
1058
2348
}
1059
2349
1060
2350
/* Lower user privileges (temporarily) */
1061
2351
errno = 0;
1062
2352
ret = seteuid(uid);
1063
2353
if(ret == -1){
1064
perror("seteuid");
2354
perror_plus("seteuid");
1065
2355
}
1066
2356
1067
2357
if(quit_now){
1094
2384
.doc = "Bit length of the prime number used in the"
1095
2385
" Diffie-Hellman key exchange",
1096
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 },
1097
2392
{ .name = "priority", .key = 130,
1098
2393
.arg = "STRING",
1099
2394
.doc = "GnuTLS priority string for the TLS handshake",
1102
2397
.arg = "SECONDS",
1103
2398
.doc = "Maximum delay to wait for interface startup",
1104
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 },
1105
2408
/*
1106
2409
* These reproduce what we would get without ARGP_NO_HELP
1107
2410
*/
1125
2428
connect_to = arg;
1126
2429
break;
1127
2430
case 'i': /* --interface */
1128
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
}
1129
2436
break;
1130
2437
case 's': /* --seckey */
1131
2438
seckey = arg;
1142
2449
}
1143
2450
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
2451
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
1145
2455
case 130: /* --priority */
1146
2456
mc.priority = arg;
1147
2457
break;
1151
2461
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
2462
argp_error(state, "Bad delay");
1153
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;
1154
2475
break;
1155
2476
/*
1156
2477
* These reproduce what we would get without ARGP_NO_HELP
1163
2484
argp_state_help(state, state->out_stream,
1164
2485
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
2486
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
2487
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
2488
exit(argp_err_exit_status);
1168
2489
break;
1169
2490
default:
1176
2497
.args_doc = "",
1177
2498
.doc = "Mandos client -- Get and decrypt"
1178
2499
" passwords from a Mandos server" };
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
1182
2503
case 0:
1183
2504
break;
1184
2505
case ENOMEM:
1185
2506
default:
1186
errno = ret;
1187
perror("argp_parse");
2507
errno = ret_errno;
2508
perror_plus("argp_parse");
1188
2509
exitcode = EX_OSERR;
1189
2510
goto end;
1190
2511
case EINVAL:
1193
2514
}
1194
2515
}
1195
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
1196
2634
if(not debug){
1197
2635
avahi_set_log_function(empty_log);
1198
2636
}
1201
2639
from the signal handler */
1202
2640
/* Initialize the pseudo-RNG for Avahi */
1203
2641
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
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");
1207
2646
exitcode = EX_UNAVAILABLE;
1208
2647
goto end;
1209
2648
}
1211
2650
sigemptyset(&sigterm_action.sa_mask);
1212
2651
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
2652
if(ret == -1){
1214
perror("sigaddset");
2653
perror_plus("sigaddset");
1215
2654
exitcode = EX_OSERR;
1216
2655
goto end;
1217
2656
}
1218
2657
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
2658
if(ret == -1){
1220
perror("sigaddset");
2659
perror_plus("sigaddset");
1221
2660
exitcode = EX_OSERR;
1222
2661
goto end;
1223
2662
}
1224
2663
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
2664
if(ret == -1){
1226
perror("sigaddset");
2665
perror_plus("sigaddset");
1227
2666
exitcode = EX_OSERR;
1228
2667
goto end;
1229
2668
}
1233
2672
*/
1234
2673
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
2674
if(ret == -1){
1236
perror("sigaction");
2675
perror_plus("sigaction");
1237
2676
return EX_OSERR;
1238
2677
}
1239
2678
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
2679
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
2680
if(ret == -1){
1242
perror("sigaction");
2681
perror_plus("sigaction");
1243
2682
exitcode = EX_OSERR;
1244
2683
goto end;
1245
2684
}
1246
2685
}
1247
2686
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
2687
if(ret == -1){
1249
perror("sigaction");
2688
perror_plus("sigaction");
1250
2689
return EX_OSERR;
1251
2690
}
1252
2691
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
2692
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
2693
if(ret == -1){
1255
perror("sigaction");
2694
perror_plus("sigaction");
1256
2695
exitcode = EX_OSERR;
1257
2696
goto end;
1258
2697
}
1259
2698
}
1260
2699
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
2700
if(ret == -1){
1262
perror("sigaction");
2701
perror_plus("sigaction");
1263
2702
return EX_OSERR;
1264
2703
}
1265
2704
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
2705
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
2706
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
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;
1359
2764
}
1360
2765
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
2766
break;
1378
2767
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
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);
1416
2796
}
1417
2797
1418
2798
if(quit_now){
1419
2799
goto end;
1420
2800
}
1421
2801
1422
ret = init_gnutls_global(pubkey, seckey);
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1423
2803
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
2804
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
2805
exitcode = EX_UNAVAILABLE;
1426
2806
goto end;
1427
2807
} else {
1432
2812
goto end;
1433
2813
}
1434
2814
1435
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
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");
1439
2826
goto end;
1440
2827
}
1441
2828
1443
2830
goto end;
1444
2831
}
1445
2832
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2833
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2834
fprintf_plus(stderr, "init_gpgme failed\n");
1448
2835
exitcode = EX_UNAVAILABLE;
1449
2836
goto end;
1450
2837
} else {
1459
2846
/* Connect directly, do not use Zeroconf */
1460
2847
/* (Mainly meant for debugging) */
1461
2848
char *address = strrchr(connect_to, ':');
2849
1462
2850
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2851
fprintf_plus(stderr, "No colon in address\n");
1464
2852
exitcode = EX_USAGE;
1465
2853
goto end;
1466
2854
}
1469
2857
goto end;
1470
2858
}
1471
2859
1472
uint16_t port;
2860
in_port_t port;
1473
2861
errno = 0;
1474
2862
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2863
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2864
or tmpmax != (in_port_t)tmpmax){
2865
fprintf_plus(stderr, "Bad port number\n");
1478
2866
exitcode = EX_USAGE;
1479
2867
goto end;
1480
2868
}
1481
2869
1482
2870
if(quit_now){
1483
2871
goto end;
1484
2872
}
1485
2873
1486
port = (uint16_t)tmpmax;
2874
port = (in_port_t)tmpmax;
1487
2875
*address = '\0';
1488
address = connect_to;
1489
2876
/* Colon in address indicates IPv6 */
1490
2877
int af;
1491
if(strchr(address, ':') != NULL){
2878
if(strchr(connect_to, ':') != NULL){
1492
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
}
1493
2886
} else {
1494
2887
af = AF_INET;
1495
2888
}
2889
address = connect_to;
1496
2890
1497
2891
if(quit_now){
1498
2892
goto end;
1499
2893
}
1500
2894
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2895
while(not quit_now){
2896
ret = start_mandos_communication(address, port, if_index, af,
2897
&mc);
2898
if(quit_now or ret == 0){
2899
break;
2900
}
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){
1523
2909
exitcode = EXIT_SUCCESS;
1524
2910
}
2911
1525
2912
goto end;
1526
2913
}
1527
2914
1539
2926
config.publish_domain = 0;
1540
2927
1541
2928
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2929
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
1545
2931
1546
2932
/* Free the Avahi configuration data */
1547
2933
avahi_server_config_free(&config);
1549
2935
1550
2936
/* Check if creating the Avahi server object succeeded */
1551
2937
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2938
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
1554
2940
exitcode = EX_UNAVAILABLE;
1555
2941
goto end;
1556
2942
}
1562
2948
/* Create the Avahi service browser */
1563
2949
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
2950
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
2951
NULL, 0, browse_callback,
2952
(void *)&mc);
1566
2953
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
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)));
1569
2956
exitcode = EX_UNAVAILABLE;
1570
2957
goto end;
1571
2958
}
1577
2964
/* Run the main loop */
1578
2965
1579
2966
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
2967
fprintf_plus(stderr, "Starting Avahi loop search\n");
1581
2968
}
1582
2969
1583
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
}
1584
2976
1585
2977
end:
1586
2978
1587
2979
if(debug){
1588
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
}
1589
2987
}
1590
2988
1591
2989
/* Cleanup things */
2990
free(mc.interfaces);
2991
1592
2992
if(sb != NULL)
1593
2993
avahi_s_service_browser_free(sb);
1594
2994
1595
2995
if(mc.server != NULL)
1596
2996
avahi_server_free(mc.server);
1597
2997
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2998
if(simple_poll != NULL)
2999
avahi_simple_poll_free(simple_poll);
1600
3000
1601
3001
if(gnutls_initialized){
1602
3002
gnutls_certificate_free_credentials(mc.cred);
1603
gnutls_global_deinit();
1604
3003
gnutls_dh_params_deinit(mc.dh_params);
1605
3004
}
1606
3005
1608
3007
gpgme_release(mc.ctx);
1609
3008
}
1610
3009
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
/* Removes the temp directory used by GPGME */
1644
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
1665
char *fullname = NULL;
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
direntry->d_name);
1668
if(ret < 0){
1669
perror("asprintf");
1670
continue;
1671
}
1672
ret = remove(fullname);
1673
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
1676
}
1677
free(fullname);
1678
}
1679
closedir(d);
1680
}
1681
ret = rmdir(tempdir);
1682
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
1684
}
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);
1685
3127
}
1686
3128
1687
3129
if(quit_now){
1691
3133
&old_sigterm_action,
1692
3134
NULL));
1693
3135
if(ret == -1){
1694
perror("sigaction");
3136
perror_plus("sigaction");
1695
3137
}
1696
3138
do {
1697
3139
ret = raise(signal_received);
1698
3140
} while(ret != 0 and errno == EINTR);
1699
3141
if(ret != 0){
1700
perror("raise");
3142
perror_plus("raise");
1701
3143
abort();
1702
3144
}
1703
3145
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0