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237.16.2
(compared to revision 237.7.495)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2011-11-11 20:19:01 UTC
- mto: (237.15.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111111201901-a92of11prspld20x
* plugins.d/mandos-client.c (main): Add "DELAY" environment variable.
Check return value from setenv().
Check return value from setenv().
- files removed:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
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9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
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#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
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41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
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strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
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getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
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#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
87
80
argp_state, struct argp,
92
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raise() */
93
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
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105
89
#ifdef __linux__
106
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#include <sys/klog.h> /* klogctl() */
124
108
init_gnutls_session(),
125
109
GNUTLS_* */
126
110
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
129
113
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/* GPGME */
131
115
#include <gpgme.h> /* All GPGME types, constants and
147
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
132
static const char sys_class_net[] = "/sys/class/net";
149
133
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
134
155
135
/* Doubly linked list that need to be circularly linked when used */
156
136
typedef struct server{
157
137
const char *ip;
158
in_port_t port;
138
uint16_t port;
159
139
AvahiIfIndex if_index;
160
140
int af;
161
141
struct timespec last_seen;
165
145
166
146
/* Used for passing in values through the Avahi callback functions */
167
147
typedef struct {
148
AvahiSimplePoll *simple_poll;
168
149
AvahiServer *server;
169
150
gnutls_certificate_credentials_t cred;
170
151
unsigned int dh_bits;
172
153
const char *priority;
173
154
gpgme_ctx_t ctx;
174
155
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
156
} mandos_context;
178
157
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
181
163
182
164
sig_atomic_t quit_now = 0;
183
165
int signal_received = 0;
184
166
185
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/* Function to use when printing errors */
186
168
void perror_plus(const char *print_text){
187
int e = errno;
188
169
fprintf(stderr, "Mandos plugin %s: ",
189
170
program_invocation_short_name);
190
errno = e;
191
171
perror(print_text);
192
172
}
193
173
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
204
174
/*
205
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
176
* bytes. "buffer_capacity" is how much is currently allocated,
207
177
* "buffer_length" is how much is already used.
208
178
*/
209
__attribute__((nonnull, warn_unused_result))
210
179
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
180
size_t buffer_capacity){
212
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
219
184
return 0;
220
185
}
221
*buffer = new_buf;
222
186
buffer_capacity += BUFFER_SIZE;
223
187
}
224
188
return buffer_capacity;
225
189
}
226
190
227
191
/* 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){
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
231
195
int ret;
232
196
server *new_server = malloc(sizeof(server));
233
197
if(new_server == NULL){
234
198
perror_plus("malloc");
235
return false;
199
return -1;
236
200
}
237
201
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
202
.port = port,
203
.if_index = if_index,
204
.af = af };
241
205
if(new_server->ip == NULL){
242
206
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;
207
return -1;
259
208
}
260
209
/* Special case of first server */
261
if(*current_server == NULL){
210
if (mc.current_server == NULL){
262
211
new_server->next = new_server;
263
212
new_server->prev = new_server;
264
*current_server = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
265
215
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
269
218
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
273
227
}
274
228
275
229
/*
276
230
* Initialize GPGME.
277
231
*/
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){
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
283
234
gpgme_error_t rc;
284
235
gpgme_engine_info_t engine_info;
285
236
237
286
238
/*
287
239
* Helper function to insert pub and seckey to the engine keyring.
288
240
*/
289
bool import_key(const char * const filename){
241
bool import_key(const char *filename){
290
242
int ret;
291
243
int fd;
292
244
gpgme_data_t pgp_data;
299
251
300
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
253
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
304
256
return false;
305
257
}
306
258
307
rc = gpgme_op_import(mc->ctx, pgp_data);
259
rc = gpgme_op_import(mc.ctx, pgp_data);
308
260
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
311
263
return false;
312
264
}
313
{
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
320
fprintf_plus(stderr,
321
"The total number of considered keys: %d\n",
322
import_result->considered);
323
fprintf_plus(stderr,
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
326
fprintf_plus(stderr,
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
341
fprintf_plus(stderr,
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
344
fprintf_plus(stderr,
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
347
fprintf_plus(stderr,
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
357
import_status->fpr);
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
362
}
363
fprintf_plus(stderr, "Key status:\n");
364
fprintf_plus(stderr,
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
368
fprintf_plus(stderr,
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
372
fprintf_plus(stderr,
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
376
fprintf_plus(stderr,
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
380
fprintf_plus(stderr,
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
384
}
385
return false;
386
}
387
}
388
265
389
ret = close(fd);
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
390
267
if(ret == -1){
391
268
perror_plus("close");
392
269
}
395
272
}
396
273
397
274
if(debug){
398
fprintf_plus(stderr, "Initializing GPGME\n");
275
fprintf(stderr, "Initializing GPGME\n");
399
276
}
400
277
401
278
/* Init GPGME */
402
279
gpgme_check_version(NULL);
403
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
404
281
if(rc != GPG_ERR_NO_ERROR){
405
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
406
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
407
284
return false;
408
285
}
409
286
410
287
/* Set GPGME home directory for the OpenPGP engine only */
411
288
rc = gpgme_get_engine_info(&engine_info);
412
289
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
415
292
return false;
416
293
}
417
294
while(engine_info != NULL){
423
300
engine_info = engine_info->next;
424
301
}
425
302
if(engine_info == NULL){
426
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
427
tempdir);
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
428
304
return false;
429
305
}
430
306
431
307
/* Create new GPGME "context" */
432
rc = gpgme_new(&(mc->ctx));
308
rc = gpgme_new(&(mc.ctx));
433
309
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
436
312
return false;
437
313
}
438
314
447
323
* Decrypt OpenPGP data.
448
324
* Returns -1 on error
449
325
*/
450
__attribute__((nonnull, warn_unused_result))
451
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
452
327
size_t crypto_size,
453
char **plaintext,
454
mandos_context *mc){
328
char **plaintext){
455
329
gpgme_data_t dh_crypto, dh_plain;
456
330
gpgme_error_t rc;
457
331
ssize_t ret;
459
333
ssize_t plaintext_length = 0;
460
334
461
335
if(debug){
462
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
463
337
}
464
338
465
339
/* Create new GPGME data buffer from memory cryptotext */
466
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
467
341
0);
468
342
if(rc != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
470
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
471
345
return -1;
472
346
}
473
347
474
348
/* Create new empty GPGME data buffer for the plaintext */
475
349
rc = gpgme_data_new(&dh_plain);
476
350
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
478
gpgme_strsource(rc), gpgme_strerror(rc));
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
479
353
gpgme_data_release(dh_crypto);
480
354
return -1;
481
355
}
482
356
483
357
/* Decrypt data from the cryptotext data buffer to the plaintext
484
358
data buffer */
485
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
486
360
if(rc != GPG_ERR_NO_ERROR){
487
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
488
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
489
363
plaintext_length = -1;
490
364
if(debug){
491
365
gpgme_decrypt_result_t result;
492
result = gpgme_op_decrypt_result(mc->ctx);
366
result = gpgme_op_decrypt_result(mc.ctx);
493
367
if(result == NULL){
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
495
369
} else {
496
if(result->unsupported_algorithm != NULL) {
497
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
498
result->unsupported_algorithm);
499
}
500
fprintf_plus(stderr, "Wrong key usage: %s\n",
501
result->wrong_key_usage ? "Yes" : "No");
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
502
374
if(result->file_name != NULL){
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
fprintf(stderr, "File name: %s\n", result->file_name);
504
376
}
505
377
gpgme_recipient_t recipient;
506
378
recipient = result->recipients;
507
379
while(recipient != NULL){
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
509
gpgme_pubkey_algo_name
510
(recipient->pubkey_algo));
511
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
512
fprintf_plus(stderr, "Secret key available: %s\n",
513
recipient->status == GPG_ERR_NO_SECKEY
514
? "No" : "Yes");
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
515
386
recipient = recipient->next;
516
387
}
517
388
}
520
391
}
521
392
522
393
if(debug){
523
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
524
395
}
525
396
526
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
533
404
*plaintext = NULL;
534
405
while(true){
535
406
plaintext_capacity = incbuffer(plaintext,
536
(size_t)plaintext_length,
537
plaintext_capacity);
407
(size_t)plaintext_length,
408
plaintext_capacity);
538
409
if(plaintext_capacity == 0){
539
perror_plus("incbuffer");
540
plaintext_length = -1;
541
goto decrypt_end;
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
542
413
}
543
414
544
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
557
428
}
558
429
559
430
if(debug){
560
fprintf_plus(stderr, "Decrypted password is: ");
431
fprintf(stderr, "Decrypted password is: ");
561
432
for(ssize_t i = 0; i < plaintext_length; i++){
562
433
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
563
434
}
574
445
return plaintext_length;
575
446
}
576
447
577
__attribute__((warn_unused_result, const))
578
static const char *safe_string(const char *str){
579
if(str == NULL)
580
return "(unknown)";
581
return str;
582
}
583
584
__attribute__((warn_unused_result))
585
static const char *safer_gnutls_strerror(int value){
586
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
451
if(ret == NULL)
452
ret = "(unknown)";
453
return ret;
588
454
}
589
455
590
456
/* GnuTLS log function callback */
591
__attribute__((nonnull))
592
457
static void debuggnutls(__attribute__((unused)) int level,
593
458
const char* string){
594
fprintf_plus(stderr, "GnuTLS: %s", string);
459
fprintf(stderr, "GnuTLS: %s", string);
595
460
}
596
461
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
598
462
static int init_gnutls_global(const char *pubkeyfilename,
599
const char *seckeyfilename,
600
const char *dhparamsfilename,
601
mandos_context *mc){
463
const char *seckeyfilename){
602
464
int ret;
603
unsigned int uret;
604
465
605
466
if(debug){
606
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
fprintf(stderr, "Initializing GnuTLS\n");
468
}
469
470
ret = gnutls_global_init();
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
474
return -1;
607
475
}
608
476
609
477
if(debug){
615
483
}
616
484
617
485
/* OpenPGP credentials */
618
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
619
487
if(ret != GNUTLS_E_SUCCESS){
620
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
621
safer_gnutls_strerror(ret));
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_global_deinit();
622
491
return -1;
623
492
}
624
493
625
494
if(debug){
626
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
627
" secret key %s as GnuTLS credentials\n",
628
pubkeyfilename,
629
seckeyfilename);
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
630
498
}
631
499
632
500
ret = gnutls_certificate_set_openpgp_key_file
633
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
634
502
GNUTLS_OPENPGP_FMT_BASE64);
635
503
if(ret != GNUTLS_E_SUCCESS){
636
fprintf_plus(stderr,
637
"Error[%d] while reading the OpenPGP key pair ('%s',"
638
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
639
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
640
safer_gnutls_strerror(ret));
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
641
509
goto globalfail;
642
510
}
643
511
644
512
/* GnuTLS server initialization */
645
ret = gnutls_dh_params_init(&mc->dh_params);
646
if(ret != GNUTLS_E_SUCCESS){
647
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
648
" initialization: %s\n",
649
safer_gnutls_strerror(ret));
650
goto globalfail;
651
}
652
/* If a Diffie-Hellman parameters file was given, try to use it */
653
if(dhparamsfilename != NULL){
654
gnutls_datum_t params = { .data = NULL, .size = 0 };
655
do {
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
657
if(dhpfile == -1){
658
perror_plus("open");
659
dhparamsfilename = NULL;
660
break;
661
}
662
size_t params_capacity = 0;
663
while(true){
664
params_capacity = incbuffer((char **)¶ms.data,
665
(size_t)params.size,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
669
free(params.data);
670
params.data = NULL;
671
dhparamsfilename = NULL;
672
break;
673
}
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
676
BUFFER_SIZE);
677
/* EOF */
678
if(bytes_read == 0){
679
break;
680
}
681
/* check bytes_read for failure */
682
if(bytes_read < 0){
683
perror_plus("read");
684
free(params.data);
685
params.data = NULL;
686
dhparamsfilename = NULL;
687
break;
688
}
689
params.size += (unsigned int)bytes_read;
690
}
691
ret = close(dhpfile);
692
if(ret == -1){
693
perror_plus("close");
694
}
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
697
}
698
if(dhparamsfilename == NULL){
699
break;
700
}
701
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
702
GNUTLS_X509_FMT_PEM);
703
if(ret != GNUTLS_E_SUCCESS){
704
fprintf_plus(stderr, "Failed to parse DH parameters in file"
705
" \"%s\": %s\n", dhparamsfilename,
706
safer_gnutls_strerror(ret));
707
dhparamsfilename = NULL;
708
}
709
free(params.data);
710
} while(false);
711
}
712
if(dhparamsfilename == NULL){
713
if(mc->dh_bits == 0){
714
/* Find out the optimal number of DH bits */
715
/* Try to read the private key file */
716
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
717
do {
718
int secfile = open(seckeyfilename, O_RDONLY);
719
if(secfile == -1){
720
perror_plus("open");
721
break;
722
}
723
size_t buffer_capacity = 0;
724
while(true){
725
buffer_capacity = incbuffer((char **)&buffer.data,
726
(size_t)buffer.size,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
730
free(buffer.data);
731
buffer.data = NULL;
732
break;
733
}
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
736
BUFFER_SIZE);
737
/* EOF */
738
if(bytes_read == 0){
739
break;
740
}
741
/* check bytes_read for failure */
742
if(bytes_read < 0){
743
perror_plus("read");
744
free(buffer.data);
745
buffer.data = NULL;
746
break;
747
}
748
buffer.size += (unsigned int)bytes_read;
749
}
750
close(secfile);
751
} while(false);
752
/* If successful, use buffer to parse private key */
753
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
754
if(buffer.data != NULL){
755
{
756
gnutls_openpgp_privkey_t privkey = NULL;
757
ret = gnutls_openpgp_privkey_init(&privkey);
758
if(ret != GNUTLS_E_SUCCESS){
759
fprintf_plus(stderr, "Error initializing OpenPGP key"
760
" structure: %s",
761
safer_gnutls_strerror(ret));
762
free(buffer.data);
763
buffer.data = NULL;
764
} else {
765
ret = gnutls_openpgp_privkey_import
766
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
769
safer_gnutls_strerror(ret));
770
privkey = NULL;
771
}
772
free(buffer.data);
773
buffer.data = NULL;
774
if(privkey != NULL){
775
/* Use private key to suggest an appropriate
776
sec_param */
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
779
if(debug){
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
783
(sec_param)));
784
}
785
}
786
}
787
}
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
791
if(debug){
792
fprintf_plus(stderr, "Falling back to security parameter"
793
" \"%s\"\n",
794
safe_string(gnutls_sec_param_get_name
795
(sec_param)));
796
}
797
}
798
}
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
800
if(uret != 0){
801
mc->dh_bits = uret;
802
if(debug){
803
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
804
" implies %u DH bits; using that.\n",
805
safe_string(gnutls_sec_param_get_name
806
(sec_param)),
807
mc->dh_bits);
808
}
809
} else {
810
fprintf_plus(stderr, "Failed to get implied number of DH"
811
" bits for security parameter \"%s\"): %s\n",
812
safe_string(gnutls_sec_param_get_name
813
(sec_param)),
814
safer_gnutls_strerror(ret));
815
goto globalfail;
816
}
817
} else if(debug){
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
819
mc->dh_bits);
820
}
821
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
822
if(ret != GNUTLS_E_SUCCESS){
823
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
824
" bits): %s\n", mc->dh_bits,
825
safer_gnutls_strerror(ret));
826
goto globalfail;
827
}
828
}
829
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
517
goto globalfail;
518
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
523
goto globalfail;
524
}
525
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
830
527
831
528
return 0;
832
529
833
530
globalfail:
834
531
835
gnutls_certificate_free_credentials(mc->cred);
836
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_certificate_free_credentials(mc.cred);
533
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
837
535
return -1;
838
536
}
839
537
840
__attribute__((nonnull, warn_unused_result))
841
static int init_gnutls_session(gnutls_session_t *session,
842
mandos_context *mc){
538
static int init_gnutls_session(gnutls_session_t *session){
843
539
int ret;
844
540
/* GnuTLS session creation */
845
541
do {
849
545
}
850
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
851
547
if(ret != GNUTLS_E_SUCCESS){
852
fprintf_plus(stderr,
853
"Error in GnuTLS session initialization: %s\n",
854
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
855
550
}
856
551
857
552
{
858
553
const char *err;
859
554
do {
860
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
861
556
if(quit_now){
862
557
gnutls_deinit(*session);
863
558
return -1;
864
559
}
865
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
866
561
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Syntax error at: %s\n", err);
868
fprintf_plus(stderr, "GnuTLS error: %s\n",
869
safer_gnutls_strerror(ret));
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
870
565
gnutls_deinit(*session);
871
566
return -1;
872
567
}
874
569
875
570
do {
876
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
877
mc->cred);
572
mc.cred);
878
573
if(quit_now){
879
574
gnutls_deinit(*session);
880
575
return -1;
881
576
}
882
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
883
578
if(ret != GNUTLS_E_SUCCESS){
884
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
885
safer_gnutls_strerror(ret));
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
886
581
gnutls_deinit(*session);
887
582
return -1;
888
583
}
890
585
/* ignore client certificate if any. */
891
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
892
587
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
893
590
return 0;
894
591
}
895
592
897
594
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
898
595
__attribute__((unused)) const char *txt){}
899
596
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
904
int ret = 0;
905
if(seteuid(0) == -1){
906
ret = errno;
907
}
908
errno = old_errno;
909
return ret;
910
}
911
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
917
if(ret != 0){
918
errno = old_errno;
919
return ret;
920
}
921
if(setuid(0) == -1){
922
ret = errno;
923
}
924
errno = old_errno;
925
return ret;
926
}
927
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
932
int ret = 0;
933
if(seteuid(uid) == -1){
934
ret = errno;
935
}
936
errno = old_errno;
937
return ret;
938
}
939
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
944
int ret = 0;
945
if(setuid(uid) == -1){
946
ret = errno;
947
}
948
errno = old_errno;
949
return ret;
950
}
951
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
955
const char *address,
956
AvahiIfIndex if_index){
957
int ret;
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
964
if(debug){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
967
}
968
return false;
969
}
970
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
974
return false;
975
}
976
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
978
if(devnull == -1){
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
980
return false;
981
}
982
pid_t pid = fork();
983
if(pid == 0){
984
/* Child */
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
987
if(errno != 0){
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
990
} else {
991
/* Set group */
992
errno = 0;
993
ret = setgid(0);
994
if(ret == -1){
995
perror_plus("setgid");
996
_exit(EX_NOPERM);
997
}
998
/* Reset supplementary groups */
999
errno = 0;
1000
ret = setgroups(0, NULL);
1001
if(ret == -1){
1002
perror_plus("setgroups");
1003
_exit(EX_NOPERM);
1004
}
1005
}
1006
ret = dup2(devnull, STDIN_FILENO);
1007
if(ret == -1){
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1009
_exit(EX_OSERR);
1010
}
1011
ret = close(devnull);
1012
if(ret == -1){
1013
perror_plus("close");
1014
_exit(EX_OSERR);
1015
}
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1017
if(ret == -1){
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1019
_exit(EX_OSERR);
1020
}
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1022
O_RDONLY
1023
| O_DIRECTORY
1024
| O_PATH
1025
| O_CLOEXEC));
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1029
}
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1031
helper, O_RDONLY));
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1036
}
1037
close(helperdir_fd);
1038
#ifdef __GNUC__
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1041
#endif
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1045
environ) == -1){
1046
#ifdef __GNUC__
1047
#pragma GCC diagnostic pop
1048
#endif
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1051
}
1052
}
1053
if(pid == -1){
1054
perror_plus("fork");
1055
return false;
1056
}
1057
int status;
1058
pid_t pret = -1;
1059
errno = 0;
1060
do {
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1068
}
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1071
}
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1074
" helper program");
1075
}
1076
return false;
1077
}
1078
} while(pret == -1 and errno == EINTR);
1079
if(pret == -1){
1080
perror_plus("waitpid");
1081
return false;
1082
}
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1087
return false;
1088
}
1089
return true;
1090
}
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1094
return false;
1095
}
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1097
return false;
1098
}
1099
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1103
if(debug){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1105
}
1106
return add_delete_local_route(true, address, if_index);
1107
}
1108
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1112
if(debug){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1114
}
1115
return add_delete_local_route(false, address, if_index);
1116
}
1117
1118
597
/* Called when a Mandos server is found */
1119
__attribute__((nonnull, warn_unused_result))
1120
static int start_mandos_communication(const char *ip, in_port_t port,
598
static int start_mandos_communication(const char *ip, uint16_t port,
1121
599
AvahiIfIndex if_index,
1122
int af, mandos_context *mc){
600
int af){
1123
601
int ret, tcp_sd = -1;
1124
602
ssize_t sret;
1125
struct sockaddr_storage to;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
1126
607
char *buffer = NULL;
1127
608
char *decrypted_buffer = NULL;
1128
609
size_t buffer_length = 0;
1131
612
int retval = -1;
1132
613
gnutls_session_t session;
1133
614
int pf; /* Protocol family */
1134
bool route_added = false;
1135
615
1136
616
errno = 0;
1137
617
1148
628
pf = PF_INET;
1149
629
break;
1150
630
default:
1151
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
fprintf(stderr, "Bad address family: %d\n", af);
1152
632
errno = EINVAL;
1153
633
return -1;
1154
634
}
1155
635
1156
/* If the interface is specified and we have a list of interfaces */
1157
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1158
/* Check if the interface is one of the interfaces we are using */
1159
bool match = false;
1160
{
1161
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
1165
if(if_nametoindex(interface) == (unsigned int)if_index){
1166
match = true;
1167
break;
1168
}
1169
}
1170
}
1171
if(not match){
1172
/* This interface does not match any in the list, so we don't
1173
connect to the server */
1174
if(debug){
1175
char interface[IF_NAMESIZE];
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
1178
} else {
1179
fprintf_plus(stderr, "Skipping server on non-used interface"
1180
" \"%s\"\n",
1181
if_indextoname((unsigned int)if_index,
1182
interface));
1183
}
1184
}
1185
return -1;
1186
}
1187
}
1188
1189
ret = init_gnutls_session(&session, mc);
636
ret = init_gnutls_session(&session);
1190
637
if(ret != 0){
1191
638
return -1;
1192
639
}
1193
640
1194
641
if(debug){
1195
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1196
PRIuMAX "\n", ip, (uintmax_t)port);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
1197
644
}
1198
645
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
1200
647
if(tcp_sd < 0){
1201
648
int e = errno;
1202
649
perror_plus("socket");
1209
656
goto mandos_end;
1210
657
}
1211
658
659
memset(&to, 0, sizeof(to));
1212
660
if(af == AF_INET6){
1213
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1214
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1215
ret = inet_pton(af, ip, &to6->sin6_addr);
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1216
663
} else { /* IPv4 */
1217
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1218
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1219
ret = inet_pton(af, ip, &to4->sin_addr);
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
1220
666
}
1221
667
if(ret < 0 ){
1222
668
int e = errno;
1226
672
}
1227
673
if(ret == 0){
1228
674
int e = errno;
1229
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
fprintf(stderr, "Bad address: %s\n", ip);
1230
676
errno = e;
1231
677
goto mandos_end;
1232
678
}
1233
679
if(af == AF_INET6){
1234
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1235
if(IN6_IS_ADDR_LINKLOCAL
1236
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
1237
687
if(if_index == AVAHI_IF_UNSPEC){
1238
fprintf_plus(stderr, "An IPv6 link-local address is"
1239
" incomplete without a network interface\n");
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
1240
690
errno = EINVAL;
1241
691
goto mandos_end;
1242
692
}
1243
693
/* Set the network interface number as scope */
1244
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
to.in6.sin6_scope_id = (uint32_t)if_index;
1245
695
}
1246
696
} else {
1247
((struct sockaddr_in *)&to)->sin_port = htons(port);
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
1248
700
}
1249
701
1250
702
if(quit_now){
1258
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1259
711
perror_plus("if_indextoname");
1260
712
} else {
1261
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1262
"\n", ip, interface, (uintmax_t)port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1263
715
}
1264
716
} else {
1265
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1266
ip, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
1267
719
}
1268
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1269
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1270
if(af == AF_INET6){
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1274
NI_NUMERICHOST);
1275
} else {
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
1279
NI_NUMERICHOST);
1280
}
1281
if(ret == EAI_SYSTEM){
1282
perror_plus("getnameinfo");
1283
} else if(ret != 0) {
1284
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1285
} else if(strcmp(addrstr, ip) != 0){
1286
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1287
}
1288
}
1289
1290
if(quit_now){
1291
errno = EINTR;
1292
goto mandos_end;
1293
}
1294
1295
while(true){
1296
if(af == AF_INET6){
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1299
} else {
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1302
}
1303
if(ret < 0){
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1310
&to)->sin6_addr)))
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1321
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1325
*/
1326
if(debug){
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1328
" direct route\n");
1329
}
1330
int e = errno;
1331
route_added = add_local_route(ip, if_index);
1332
if(route_added){
1333
continue;
1334
}
1335
errno = e;
1336
}
1337
if(errno != ECONNREFUSED or debug){
1338
int e = errno;
1339
perror_plus("connect");
1340
errno = e;
1341
}
1342
goto mandos_end;
1343
}
1344
1345
if(quit_now){
1346
errno = EINTR;
1347
goto mandos_end;
1348
}
1349
break;
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
736
}
737
}
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
1350
761
}
1351
762
1352
763
const char *out = mandos_protocol_version;
1354
765
while(true){
1355
766
size_t out_size = strlen(out);
1356
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1357
out_size - written));
768
out_size - written));
1358
769
if(ret == -1){
1359
770
int e = errno;
1360
771
perror_plus("write");
1380
791
}
1381
792
1382
793
if(debug){
1383
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1384
795
}
1385
796
1386
797
if(quit_now){
1388
799
goto mandos_end;
1389
800
}
1390
801
1391
/* This casting via intptr_t is to eliminate warning about casting
1392
an int to a pointer type. This is exactly how the GnuTLS Guile
1393
function "set-session-transport-fd!" does it. */
1394
gnutls_transport_set_ptr(session,
1395
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1396
804
1397
805
if(quit_now){
1398
806
errno = EINTR;
1409
817
1410
818
if(ret != GNUTLS_E_SUCCESS){
1411
819
if(debug){
1412
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1413
821
gnutls_perror(ret);
1414
822
}
1415
823
errno = EPROTO;
1419
827
/* Read OpenPGP packet that contains the wanted password */
1420
828
1421
829
if(debug){
1422
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1423
" %s\n", ip);
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
1424
832
}
1425
833
1426
834
while(true){
1431
839
}
1432
840
1433
841
buffer_capacity = incbuffer(&buffer, buffer_length,
1434
buffer_capacity);
842
buffer_capacity);
1435
843
if(buffer_capacity == 0){
1436
844
int e = errno;
1437
845
perror_plus("incbuffer");
1464
872
}
1465
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1466
874
if(ret < 0){
1467
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1468
"***\n");
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1469
876
gnutls_perror(ret);
1470
877
errno = EPROTO;
1471
878
goto mandos_end;
1472
879
}
1473
880
break;
1474
881
default:
1475
fprintf_plus(stderr, "Unknown error while reading data from"
1476
" encrypted session with Mandos server\n");
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
1477
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1478
885
errno = EIO;
1479
886
goto mandos_end;
1484
891
}
1485
892
1486
893
if(debug){
1487
fprintf_plus(stderr, "Closing TLS session\n");
894
fprintf(stderr, "Closing TLS session\n");
1488
895
}
1489
896
1490
897
if(quit_now){
1502
909
1503
910
if(buffer_length > 0){
1504
911
ssize_t decrypted_buffer_size;
1505
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1506
&decrypted_buffer, mc);
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1507
915
if(decrypted_buffer_size >= 0){
1508
916
1509
clearerr(stdout);
1510
917
written = 0;
1511
918
while(written < (size_t) decrypted_buffer_size){
1512
919
if(quit_now){
1520
927
if(ret == 0 and ferror(stdout)){
1521
928
int e = errno;
1522
929
if(debug){
1523
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1524
strerror(errno));
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1525
932
}
1526
933
errno = e;
1527
934
goto mandos_end;
1528
935
}
1529
936
written += (size_t)ret;
1530
937
}
1531
ret = fflush(stdout);
1532
if(ret != 0){
1533
int e = errno;
1534
if(debug){
1535
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1536
strerror(errno));
1537
}
1538
errno = e;
1539
goto mandos_end;
1540
}
1541
938
retval = 0;
1542
939
}
1543
940
}
1546
943
1547
944
mandos_end:
1548
945
{
1549
if(route_added){
1550
if(not delete_local_route(ip, if_index)){
1551
fprintf_plus(stderr, "Failed to delete local route to %s on"
1552
" interface %d", ip, if_index);
1553
}
1554
}
1555
946
int e = errno;
1556
947
free(decrypted_buffer);
1557
948
free(buffer);
1558
949
if(tcp_sd >= 0){
1559
ret = close(tcp_sd);
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1560
951
}
1561
952
if(ret == -1){
1562
953
if(e == 0){
1587
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
1588
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1589
980
flags,
1590
void *mc){
1591
if(r == NULL){
1592
return;
1593
}
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1594
983
1595
984
/* Called whenever a service has been resolved successfully or
1596
985
timed out */
1597
986
1598
987
if(quit_now){
1599
avahi_s_service_resolver_free(r);
1600
988
return;
1601
989
}
1602
990
1603
991
switch(event){
1604
992
default:
1605
993
case AVAHI_RESOLVER_FAILURE:
1606
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1607
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1608
domain,
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1611
997
break;
1612
998
1613
999
case AVAHI_RESOLVER_FOUND:
1615
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1616
1002
avahi_address_snprint(ip, sizeof(ip), address);
1617
1003
if(debug){
1618
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1619
PRIdMAX ") on port %" PRIu16 "\n", name,
1620
host_name, ip, (intmax_t)interface, port);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1621
1007
}
1622
int ret = start_mandos_communication(ip, (in_port_t)port,
1623
interface,
1624
avahi_proto_to_af(proto),
1625
mc);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1626
1010
if(ret == 0){
1627
avahi_simple_poll_quit(simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1628
1012
} else {
1629
if(not add_server(ip, (in_port_t)port, interface,
1630
avahi_proto_to_af(proto),
1631
&((mandos_context*)mc)->current_server)){
1632
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1633
" list\n", name);
1634
}
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1635
1015
}
1636
1016
}
1637
1017
}
1647
1027
const char *domain,
1648
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1649
1029
flags,
1650
void *mc){
1651
if(b == NULL){
1652
return;
1653
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1654
1032
1655
1033
/* Called whenever a new services becomes available on the LAN or
1656
1034
is removed from the LAN */
1663
1041
default:
1664
1042
case AVAHI_BROWSER_FAILURE:
1665
1043
1666
fprintf_plus(stderr, "(Avahi browser) %s\n",
1667
avahi_strerror(avahi_server_errno
1668
(((mandos_context*)mc)->server)));
1669
avahi_simple_poll_quit(simple_poll);
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1670
1047
return;
1671
1048
1672
1049
case AVAHI_BROWSER_NEW:
1675
1052
the callback function is called the Avahi server will free the
1676
1053
resolver for us. */
1677
1054
1678
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1679
interface, protocol, name, type,
1680
domain, protocol, 0,
1681
resolve_callback, mc) == NULL)
1682
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1683
" %s\n", name,
1684
avahi_strerror(avahi_server_errno
1685
(((mandos_context*)mc)->server)));
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1686
1060
break;
1687
1061
1688
1062
case AVAHI_BROWSER_REMOVE:
1691
1065
case AVAHI_BROWSER_ALL_FOR_NOW:
1692
1066
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1693
1067
if(debug){
1694
fprintf_plus(stderr, "No Mandos server found, still"
1695
" searching...\n");
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1696
1069
}
1697
1070
break;
1698
1071
}
1707
1080
signal_received = sig;
1708
1081
int old_errno = errno;
1709
1082
/* set main loop to exit */
1710
if(simple_poll != NULL){
1711
avahi_simple_poll_quit(simple_poll);
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1712
1085
}
1713
1086
errno = old_errno;
1714
1087
}
1715
1088
1716
__attribute__((nonnull, warn_unused_result))
1717
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1718
1090
int ret;
1719
int old_errno;
1720
1091
1721
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1722
1093
if(s < 0){
1723
old_errno = errno;
1724
1094
perror_plus("socket");
1725
errno = old_errno;
1726
1095
return false;
1727
1096
}
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1097
strcpy(ifr->ifr_name, ifname);
1730
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1731
1099
if(ret == -1){
1732
1100
if(debug){
1733
old_errno = errno;
1734
1101
perror_plus("ioctl SIOCGIFFLAGS");
1735
errno = old_errno;
1736
}
1737
if((close(s) == -1) and debug){
1738
old_errno = errno;
1739
perror_plus("close");
1740
errno = old_errno;
1741
1102
}
1742
1103
return false;
1743
1104
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1749
1105
return true;
1750
1106
}
1751
1107
1752
__attribute__((nonnull, warn_unused_result))
1753
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1754
1109
1755
1110
/* Reject the loopback device */
1756
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1757
1112
if(debug){
1758
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1759
ifname);
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1760
1115
}
1761
1116
return false;
1762
1117
}
1763
1118
/* Accept point-to-point devices only if connect_to is specified */
1764
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1765
1120
if(debug){
1766
fprintf_plus(stderr, "Accepting point-to-point interface"
1767
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1768
1123
}
1769
1124
return true;
1770
1125
}
1771
1126
/* Otherwise, reject non-broadcast-capable devices */
1772
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1773
1128
if(debug){
1774
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1775
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1776
1131
}
1777
1132
return false;
1778
1133
}
1779
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1780
1135
if(ifr->ifr_flags & IFF_NOARP){
1781
1136
if(debug){
1782
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1783
ifname);
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1784
1138
}
1785
1139
return false;
1786
1140
}
1787
1141
1788
1142
/* Accept this device */
1789
1143
if(debug){
1790
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1791
1145
}
1792
1146
return true;
1793
1147
}
1797
1151
* corresponds to an acceptable network device.
1798
1152
* (This function is passed to scandir(3) as a filter function.)
1799
1153
*/
1800
__attribute__((nonnull, warn_unused_result))
1801
1154
int good_interface(const struct dirent *if_entry){
1802
1155
if(if_entry->d_name[0] == '.'){
1803
1156
return 0;
1806
1159
struct ifreq ifr;
1807
1160
if(not get_flags(if_entry->d_name, &ifr)){
1808
1161
if(debug){
1809
fprintf_plus(stderr, "Failed to get flags for interface "
1810
"\"%s\"\n", if_entry->d_name);
1811
}
1812
return 0;
1813
}
1814
1815
if(not good_flags(if_entry->d_name, &ifr)){
1816
return 0;
1817
}
1818
return 1;
1819
}
1820
1821
/*
1822
* This function determines if a network interface is up.
1823
*/
1824
__attribute__((nonnull, warn_unused_result))
1825
bool interface_is_up(const char *interface){
1826
struct ifreq ifr;
1827
if(not get_flags(interface, &ifr)){
1828
if(debug){
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
}
1832
return false;
1833
}
1834
1835
return (bool)(ifr.ifr_flags & IFF_UP);
1836
}
1837
1838
/*
1839
* This function determines if a network interface is running
1840
*/
1841
__attribute__((nonnull, warn_unused_result))
1842
bool interface_is_running(const char *interface){
1843
struct ifreq ifr;
1844
if(not get_flags(interface, &ifr)){
1845
if(debug){
1846
fprintf_plus(stderr, "Failed to get flags for interface "
1847
"\"%s\"\n", interface);
1848
}
1849
return false;
1850
}
1851
1852
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1853
}
1854
1855
__attribute__((nonnull, pure, warn_unused_result))
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1856
1217
int notdotentries(const struct dirent *direntry){
1857
1218
/* Skip "." and ".." */
1858
1219
if(direntry->d_name[0] == '.'
1865
1226
}
1866
1227
1867
1228
/* Is this directory entry a runnable program? */
1868
__attribute__((nonnull, warn_unused_result))
1869
1229
int runnable_hook(const struct dirent *direntry){
1870
1230
int ret;
1871
size_t sret;
1872
1231
struct stat st;
1873
1232
1874
1233
if((direntry->d_name)[0] == '\0'){
1876
1235
return 0;
1877
1236
}
1878
1237
1879
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1880
"abcdefghijklmnopqrstuvwxyz"
1881
"0123456789"
1882
"_.-");
1883
if((direntry->d_name)[sret] != '\0'){
1884
/* Contains non-allowed characters */
1885
if(debug){
1886
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1887
direntry->d_name);
1888
}
1889
return 0;
1890
}
1891
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1893
1255
if(ret == -1){
1894
1256
if(debug){
1895
perror_plus("Could not stat hook");
1257
perror_plus("Could not stat plugin");
1896
1258
}
1897
1259
return 0;
1898
1260
}
1899
1261
if(not (S_ISREG(st.st_mode))){
1900
1262
/* Not a regular file */
1901
if(debug){
1902
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1903
direntry->d_name);
1904
}
1905
1263
return 0;
1906
1264
}
1907
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1908
1266
/* Not executable */
1909
if(debug){
1910
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1911
direntry->d_name);
1912
}
1913
1267
return 0;
1914
1268
}
1915
if(debug){
1916
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1917
direntry->d_name);
1918
}
1919
1269
return 1;
1920
1270
}
1921
1271
1922
__attribute__((nonnull, warn_unused_result))
1923
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1924
mandos_context *mc){
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1925
1273
int ret;
1926
1274
struct timespec now;
1927
1275
struct timespec waited_time;
1928
1276
intmax_t block_time;
1929
1277
1930
1278
while(true){
1931
if(mc->current_server == NULL){
1932
if(debug){
1933
fprintf_plus(stderr, "Wait until first server is found."
1934
" No timeout!\n");
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1935
1283
}
1936
1284
ret = avahi_simple_poll_iterate(s, -1);
1937
1285
} else {
1938
if(debug){
1939
fprintf_plus(stderr, "Check current_server if we should run"
1940
" it, or wait\n");
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1941
1289
}
1942
1290
/* the current time */
1943
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1948
1296
/* Calculating in ms how long time between now and server
1949
1297
who we visted longest time ago. Now - last seen. */
1950
1298
waited_time.tv_sec = (now.tv_sec
1951
- mc->current_server->last_seen.tv_sec);
1299
- mc.current_server->last_seen.tv_sec);
1952
1300
waited_time.tv_nsec = (now.tv_nsec
1953
- mc->current_server->last_seen.tv_nsec);
1301
- mc.current_server->last_seen.tv_nsec);
1954
1302
/* total time is 10s/10,000ms.
1955
1303
Converting to s from ms by dividing by 1,000,
1956
1304
and ns to ms by dividing by 1,000,000. */
1958
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1959
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1960
1308
1961
if(debug){
1962
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1963
block_time);
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1964
1311
}
1965
1312
1966
1313
if(block_time <= 0){
1967
ret = start_mandos_communication(mc->current_server->ip,
1968
mc->current_server->port,
1969
mc->current_server->if_index,
1970
mc->current_server->af, mc);
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1971
1318
if(ret == 0){
1972
avahi_simple_poll_quit(s);
1319
avahi_simple_poll_quit(mc.simple_poll);
1973
1320
return 0;
1974
1321
}
1975
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1976
&mc->current_server->last_seen);
1323
&mc.current_server->last_seen);
1977
1324
if(ret == -1){
1978
1325
perror_plus("clock_gettime");
1979
1326
return -1;
1980
1327
}
1981
mc->current_server = mc->current_server->next;
1328
mc.current_server = mc.current_server->next;
1982
1329
block_time = 0; /* Call avahi to find new Mandos
1983
1330
servers, but don't block */
1984
1331
}
1986
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1987
1334
}
1988
1335
if(ret != 0){
1989
if(ret > 0 or errno != EINTR){
1336
if (ret > 0 or errno != EINTR) {
1990
1337
return (ret != 1) ? ret : 0;
1991
1338
}
1992
1339
}
1993
1340
}
1994
1341
}
1995
1342
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1998
const float delay){
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2005
if(debug){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2008
}
2009
} else {
2010
perror_plus("open");
2011
}
2012
return;
2013
}
2014
}
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2016
if(devnull == -1){
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2018
return;
2019
}
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
2022
if(numhooks == -1){
2023
perror_plus("scandir");
2024
close(devnull);
2025
return;
2026
}
2027
struct dirent *direntry;
2028
int ret;
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2031
if(debug){
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2033
direntry->d_name);
2034
}
2035
pid_t hook_pid = fork();
2036
if(hook_pid == 0){
2037
/* Child */
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
2041
perror_plus("Failed to raise privileges");
2042
_exit(EX_NOPERM);
2043
}
2044
/* Set group */
2045
errno = 0;
2046
ret = setgid(0);
2047
if(ret == -1){
2048
perror_plus("setgid");
2049
_exit(EX_NOPERM);
2050
}
2051
/* Reset supplementary groups */
2052
errno = 0;
2053
ret = setgroups(0, NULL);
2054
if(ret == -1){
2055
perror_plus("setgroups");
2056
_exit(EX_NOPERM);
2057
}
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
if(ret == -1){
2060
perror_plus("setenv");
2061
_exit(EX_OSERR);
2062
}
2063
ret = setenv("DEVICE", interface, 1);
2064
if(ret == -1){
2065
perror_plus("setenv");
2066
_exit(EX_OSERR);
2067
}
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2069
if(ret == -1){
2070
perror_plus("setenv");
2071
_exit(EX_OSERR);
2072
}
2073
ret = setenv("MODE", mode, 1);
2074
if(ret == -1){
2075
perror_plus("setenv");
2076
_exit(EX_OSERR);
2077
}
2078
char *delaystring;
2079
ret = asprintf(&delaystring, "%f", (double)delay);
2080
if(ret == -1){
2081
perror_plus("asprintf");
2082
_exit(EX_OSERR);
2083
}
2084
ret = setenv("DELAY", delaystring, 1);
2085
if(ret == -1){
2086
free(delaystring);
2087
perror_plus("setenv");
2088
_exit(EX_OSERR);
2089
}
2090
free(delaystring);
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2093
if(ret == -1){
2094
perror_plus("setenv");
2095
_exit(EX_OSERR);
2096
}
2097
}
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
direntry->d_name,
2100
O_RDONLY));
2101
if(hook_fd == -1){
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2104
}
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2108
}
2109
ret = dup2(devnull, STDIN_FILENO);
2110
if(ret == -1){
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2112
_exit(EX_OSERR);
2113
}
2114
ret = close(devnull);
2115
if(ret == -1){
2116
perror_plus("close");
2117
_exit(EX_OSERR);
2118
}
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2120
if(ret == -1){
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2122
_exit(EX_OSERR);
2123
}
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2125
environ) == -1){
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2128
}
2129
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
int status;
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2138
free(direntry);
2139
continue;
2140
}
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2146
free(direntry);
2147
continue;
2148
}
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2152
WTERMSIG(status));
2153
free(direntry);
2154
continue;
2155
} else {
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
continue;
2160
}
2161
}
2162
if(debug){
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
direntry->d_name);
2165
}
2166
free(direntry);
2167
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2171
} else {
2172
hookdir_fd = -1;
2173
}
2174
close(devnull);
2175
}
2176
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
2181
int ret;
2182
struct ifreq network;
2183
unsigned int if_index = if_nametoindex(interface);
2184
if(if_index == 0){
2185
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2186
errno = old_errno;
2187
return ENXIO;
2188
}
2189
2190
if(quit_now){
2191
errno = old_errno;
2192
return EINTR;
2193
}
2194
2195
if(not interface_is_up(interface)){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
2198
if(not get_flags(interface, &network)){
2199
ret_errno = errno;
2200
fprintf_plus(stderr, "Failed to get flags for interface "
2201
"\"%s\"\n", interface);
2202
errno = old_errno;
2203
return ret_errno;
2204
}
2205
network.ifr_flags |= IFF_UP; /* set flag */
2206
2207
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2208
if(sd == -1){
2209
ret_errno = errno;
2210
perror_plus("socket");
2211
errno = old_errno;
2212
return ret_errno;
2213
}
2214
2215
if(quit_now){
2216
ret = close(sd);
2217
if(ret == -1){
2218
perror_plus("close");
2219
}
2220
errno = old_errno;
2221
return EINTR;
2222
}
2223
2224
if(debug){
2225
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2226
interface);
2227
}
2228
2229
/* Raise privileges */
2230
ret_errno = raise_privileges();
2231
if(ret_errno != 0){
2232
errno = ret_errno;
2233
perror_plus("Failed to raise privileges");
2234
}
2235
2236
#ifdef __linux__
2237
int ret_linux;
2238
bool restore_loglevel = false;
2239
if(ret_errno == 0){
2240
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
messages about the network interface to mess up the prompt */
2242
ret_linux = klogctl(8, NULL, 5);
2243
if(ret_linux == -1){
2244
perror_plus("klogctl");
2245
} else {
2246
restore_loglevel = true;
2247
}
2248
}
2249
#endif /* __linux__ */
2250
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2251
ioctl_errno = errno;
2252
#ifdef __linux__
2253
if(restore_loglevel){
2254
ret_linux = klogctl(7, NULL, 0);
2255
if(ret_linux == -1){
2256
perror_plus("klogctl");
2257
}
2258
}
2259
#endif /* __linux__ */
2260
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
2270
2271
/* Close the socket */
2272
ret = close(sd);
2273
if(ret == -1){
2274
perror_plus("close");
2275
}
2276
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2280
errno = old_errno;
2281
return ioctl_errno;
2282
}
2283
} else if(debug){
2284
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2285
interface);
2286
}
2287
2288
/* Sleep checking until interface is running.
2289
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
2291
if(interface_is_running(interface)){
2292
break;
2293
}
2294
struct timespec sleeptime = { .tv_nsec = 250000000 };
2295
ret = nanosleep(&sleeptime, NULL);
2296
if(ret == -1 and errno != EINTR){
2297
perror_plus("nanosleep");
2298
}
2299
}
2300
2301
errno = old_errno;
2302
return 0;
2303
}
2304
2305
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
2308
struct ifreq network;
2309
unsigned int if_index = if_nametoindex(interface);
2310
if(if_index == 0){
2311
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2312
errno = old_errno;
2313
return ENXIO;
2314
}
2315
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
2318
if(not get_flags(interface, &network) and debug){
2319
ret_errno = errno;
2320
fprintf_plus(stderr, "Failed to get flags for interface "
2321
"\"%s\"\n", interface);
2322
errno = old_errno;
2323
return ret_errno;
2324
}
2325
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2326
2327
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2328
if(sd == -1){
2329
ret_errno = errno;
2330
perror_plus("socket");
2331
errno = old_errno;
2332
return ret_errno;
2333
}
2334
2335
if(debug){
2336
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2337
interface);
2338
}
2339
2340
/* Raise privileges */
2341
ret_errno = raise_privileges();
2342
if(ret_errno != 0){
2343
errno = ret_errno;
2344
perror_plus("Failed to raise privileges");
2345
}
2346
2347
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
ioctl_errno = errno;
2349
2350
/* If raise_privileges() succeeded above */
2351
if(ret_errno == 0){
2352
/* Lower privileges */
2353
ret_errno = lower_privileges();
2354
if(ret_errno != 0){
2355
errno = ret_errno;
2356
perror_plus("Failed to lower privileges");
2357
}
2358
}
2359
2360
/* Close the socket */
2361
int ret = close(sd);
2362
if(ret == -1){
2363
perror_plus("close");
2364
}
2365
2366
if(ret_setflags == -1){
2367
errno = ioctl_errno;
2368
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2369
errno = old_errno;
2370
return ioctl_errno;
2371
}
2372
} else if(debug){
2373
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2374
interface);
2375
}
2376
2377
errno = old_errno;
2378
return 0;
2379
}
2380
2381
1343
int main(int argc, char *argv[]){
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
2387
1344
AvahiSServiceBrowser *sb = NULL;
2388
error_t ret_errno;
1345
int error;
2389
1346
int ret;
2390
1347
intmax_t tmpmax;
2391
1348
char *tmp;
2392
1349
int exitcode = EXIT_SUCCESS;
2393
char *interfaces_to_take_down = NULL;
2394
size_t interfaces_to_take_down_size = 0;
2395
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2396
char old_tempdir[] = "/tmp/mandosXXXXXX";
2397
char *tempdir = NULL;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
2398
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2399
1359
const char *seckey = PATHDIR "/" SECKEY;
2400
1360
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
char *interfaces_hooks = NULL;
2403
1361
2404
1362
bool gnutls_initialized = false;
2405
1363
bool gpgme_initialized = false;
2457
1415
.doc = "Bit length of the prime number used in the"
2458
1416
" Diffie-Hellman key exchange",
2459
1417
.group = 2 },
2460
{ .name = "dh-params", .key = 134,
2461
.arg = "FILE",
2462
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2463
" for the Diffie-Hellman key exchange",
2464
.group = 2 },
2465
1418
{ .name = "priority", .key = 130,
2466
1419
.arg = "STRING",
2467
1420
.doc = "GnuTLS priority string for the TLS handshake",
2472
1425
.group = 2 },
2473
1426
{ .name = "retry", .key = 132,
2474
1427
.arg = "SECONDS",
2475
.doc = "Retry interval used when denied by the Mandos server",
2476
.group = 2 },
2477
{ .name = "network-hook-dir", .key = 133,
2478
.arg = "DIR",
2479
.doc = "Directory where network hooks are located",
1428
.doc = "Retry interval used when denied by the mandos server",
2480
1429
.group = 2 },
2481
1430
/*
2482
1431
* These reproduce what we would get without ARGP_NO_HELP
2501
1450
connect_to = arg;
2502
1451
break;
2503
1452
case 'i': /* --interface */
2504
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2505
arg, (int)',');
2506
if(ret_errno != 0){
2507
argp_error(state, "%s", strerror(ret_errno));
2508
}
1453
interface = arg;
2509
1454
break;
2510
1455
case 's': /* --seckey */
2511
1456
seckey = arg;
2522
1467
}
2523
1468
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2524
1469
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
2528
1470
case 130: /* --priority */
2529
1471
mc.priority = arg;
2530
1472
break;
2543
1485
argp_error(state, "Bad retry interval");
2544
1486
}
2545
1487
break;
2546
case 133: /* --network-hook-dir */
2547
hookdir = arg;
2548
break;
2549
1488
/*
2550
1489
* These reproduce what we would get without ARGP_NO_HELP
2551
1490
*/
2557
1496
argp_state_help(state, state->out_stream,
2558
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2559
1498
case 'V': /* --version */
2560
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
2561
1500
exit(argp_err_exit_status);
2562
1501
break;
2563
1502
default:
2570
1509
.args_doc = "",
2571
1510
.doc = "Mandos client -- Get and decrypt"
2572
1511
" passwords from a Mandos server" };
2573
ret_errno = argp_parse(&argp, argc, argv,
2574
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2575
switch(ret_errno){
1512
ret = argp_parse(&argp, argc, argv,
1513
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1514
switch(ret){
2576
1515
case 0:
2577
1516
break;
2578
1517
case ENOMEM:
2579
1518
default:
2580
errno = ret_errno;
1519
errno = ret;
2581
1520
perror_plus("argp_parse");
2582
1521
exitcode = EX_OSERR;
2583
1522
goto end;
2586
1525
goto end;
2587
1526
}
2588
1527
}
2589
1528
2590
1529
{
2591
1530
/* Work around Debian bug #633582:
2592
<https://bugs.debian.org/633582> */
2593
2594
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2598
perror_plus("Failed to raise privileges");
2599
} else {
2600
struct stat st;
2601
2602
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2603
int seckey_fd = open(seckey, O_RDONLY);
2604
if(seckey_fd == -1){
2605
perror_plus("open");
2606
} else {
2607
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2608
if(ret == -1){
2609
perror_plus("fstat");
2610
} else {
2611
if(S_ISREG(st.st_mode)
2612
and st.st_uid == 0 and st.st_gid == 0){
2613
ret = fchown(seckey_fd, uid, gid);
2614
if(ret == -1){
2615
perror_plus("fchown");
2616
}
2617
}
2618
}
2619
close(seckey_fd);
2620
}
2621
}
2622
2623
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2624
int pubkey_fd = open(pubkey, O_RDONLY);
2625
if(pubkey_fd == -1){
2626
perror_plus("open");
2627
} else {
2628
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2629
if(ret == -1){
2630
perror_plus("fstat");
2631
} else {
2632
if(S_ISREG(st.st_mode)
2633
and st.st_uid == 0 and st.st_gid == 0){
2634
ret = fchown(pubkey_fd, uid, gid);
2635
if(ret == -1){
2636
perror_plus("fchown");
2637
}
2638
}
2639
}
2640
close(pubkey_fd);
2641
}
2642
}
2643
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2649
} else {
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2651
if(ret == -1){
2652
perror_plus("fstat");
2653
} else {
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2657
if(ret == -1){
2658
perror_plus("fchown");
2659
}
2660
}
2661
}
2662
close(dhparams_fd);
2663
}
2664
}
2665
2666
/* Lower privileges */
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2670
perror_plus("Failed to lower privileges");
2671
}
2672
}
2673
}
2674
2675
/* Remove invalid interface names (except "none") */
2676
{
2677
char *interface = NULL;
2678
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2679
interface))){
2680
if(strcmp(interface, "none") != 0
2681
and if_nametoindex(interface) == 0){
2682
if(interface[0] != '\0'){
2683
fprintf_plus(stderr, "Not using nonexisting interface"
2684
" \"%s\"\n", interface);
2685
}
2686
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2687
interface = NULL;
2688
}
2689
}
2690
}
2691
2692
/* Run network hooks */
2693
{
2694
if(mc.interfaces != NULL){
2695
interfaces_hooks = malloc(mc.interfaces_size);
2696
if(interfaces_hooks == NULL){
2697
perror_plus("malloc");
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
ret = setenv("DEVICE", interface, 1);
1612
if(ret == -1){
1613
perror_plus("setenv");
1614
exit(1);
1615
}
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1617
if(ret == -1){
1618
perror_plus("setenv");
1619
exit(1);
1620
}
1621
ret = setenv("MODE", "start", 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
exit(1);
1625
}
1626
char *delaystring;
1627
ret = asprintf(&delaystring, "%f", delay);
1628
if(ret == -1){
1629
perror_plus("asprintf");
1630
exit(1);
1631
}
1632
ret = setenv("DELAY", delaystring, 1);
1633
if(ret == -1){
1634
free(delaystring);
1635
perror_plus("setenv");
1636
exit(1);
1637
}
1638
free(delaystring);
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
1641
}
1642
free(fullname);
1643
if(quit_now){
2698
1644
goto end;
2699
1645
}
2700
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2701
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2702
1646
}
2703
run_network_hooks("start", interfaces_hooks != NULL ?
2704
interfaces_hooks : "", delay);
1647
close(devnull);
2705
1648
}
2706
1649
2707
1650
if(not debug){
2708
1651
avahi_set_log_function(empty_log);
2709
1652
}
2710
1653
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1658
alphasort);
1659
if(ret == 0){
1660
/* No up interfaces, look for any good interfaces */
1661
free(direntries);
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1663
alphasort);
1664
}
1665
if(ret >= 1){
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1668
if(debug){
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1670
}
1671
if(interface == NULL){
1672
perror_plus("malloc");
1673
free(direntries);
1674
exitcode = EXIT_FAILURE;
1675
goto end;
1676
}
1677
free(direntries);
1678
} else {
1679
free(direntries);
1680
fprintf(stderr, "Could not find a network interface\n");
1681
exitcode = EXIT_FAILURE;
1682
goto end;
1683
}
1684
}
1685
2711
1686
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2712
1687
from the signal handler */
2713
1688
/* Initialize the pseudo-RNG for Avahi */
2714
1689
srand((unsigned int) time(NULL));
2715
simple_poll = avahi_simple_poll_new();
2716
if(simple_poll == NULL){
2717
fprintf_plus(stderr,
2718
"Avahi: Failed to create simple poll object.\n");
1690
mc.simple_poll = avahi_simple_poll_new();
1691
if(mc.simple_poll == NULL){
1692
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2719
1693
exitcode = EX_UNAVAILABLE;
2720
1694
goto end;
2721
1695
}
2783
1757
}
2784
1758
}
2785
1759
2786
/* If no interfaces were specified, make a list */
2787
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2789
/* Look for any good interfaces */
2790
ret = scandir(sys_class_net, &direntries, good_interface,
2791
alphasort);
2792
if(ret >= 1){
2793
/* Add all found interfaces to interfaces list */
2794
for(int i = 0; i < ret; ++i){
2795
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2796
direntries[i]->d_name);
2797
if(ret_errno != 0){
2798
errno = ret_errno;
2799
perror_plus("argz_add");
2800
free(direntries[i]);
2801
continue;
2802
}
2803
if(debug){
2804
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
direntries[i]->d_name);
2806
}
2807
free(direntries[i]);
2808
}
2809
free(direntries);
1760
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
1762
if_index = (AvahiIfIndex) if_nametoindex(interface);
1763
if(if_index == 0){
1764
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1765
exitcode = EX_UNAVAILABLE;
1766
goto end;
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
/* Re-raise priviliges */
1774
errno = 0;
1775
ret = seteuid(0);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
1780
#ifdef __linux__
1781
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1783
ret = klogctl(8, NULL, 5);
1784
bool restore_loglevel = true;
1785
if(ret == -1){
1786
restore_loglevel = false;
1787
perror_plus("klogctl");
1788
}
1789
#endif /* __linux__ */
1790
1791
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1792
if(sd < 0){
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1795
#ifdef __linux__
1796
if(restore_loglevel){
1797
ret = klogctl(7, NULL, 0);
1798
if(ret == -1){
1799
perror_plus("klogctl");
1800
}
1801
}
1802
#endif /* __linux__ */
1803
/* Lower privileges */
1804
errno = 0;
1805
ret = seteuid(uid);
1806
if(ret == -1){
1807
perror_plus("seteuid");
1808
}
1809
goto end;
1810
}
1811
strcpy(network.ifr_name, interface);
1812
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1813
if(ret == -1){
1814
perror_plus("ioctl SIOCGIFFLAGS");
1815
#ifdef __linux__
1816
if(restore_loglevel){
1817
ret = klogctl(7, NULL, 0);
1818
if(ret == -1){
1819
perror_plus("klogctl");
1820
}
1821
}
1822
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
if((network.ifr_flags & IFF_UP) == 0){
1833
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1836
if(ret == -1){
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1840
#ifdef __linux__
1841
if(restore_loglevel){
1842
ret = klogctl(7, NULL, 0);
1843
if(ret == -1){
1844
perror_plus("klogctl");
1845
}
1846
}
1847
#endif /* __linux__ */
1848
/* Lower privileges */
1849
errno = 0;
1850
ret = seteuid(uid);
1851
if(ret == -1){
1852
perror_plus("seteuid");
1853
}
1854
goto end;
1855
}
1856
}
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1859
for(int i=0; i < delay * 4; i++){
1860
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1861
if(ret == -1){
1862
perror_plus("ioctl SIOCGIFFLAGS");
1863
} else if(network.ifr_flags & IFF_RUNNING){
1864
break;
1865
}
1866
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
ret = nanosleep(&sleeptime, NULL);
1868
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1870
}
1871
}
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1875
if(ret == -1){
1876
perror_plus("close");
1877
}
1878
}
1879
#ifdef __linux__
1880
if(restore_loglevel){
1881
/* Restores kernel loglevel to default */
1882
ret = klogctl(7, NULL, 0);
1883
if(ret == -1){
1884
perror_plus("klogctl");
1885
}
1886
}
1887
#endif /* __linux__ */
1888
/* Lower privileges */
1889
errno = 0;
1890
if(take_down_interface){
1891
/* Lower privileges */
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
2810
1896
} else {
2811
if(ret == 0){
2812
free(direntries);
2813
}
2814
fprintf_plus(stderr, "Could not find a network interface\n");
2815
exitcode = EXIT_FAILURE;
2816
goto end;
2817
}
2818
}
2819
2820
/* Bring up interfaces which are down, and remove any "none"s */
2821
{
2822
char *interface = NULL;
2823
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2824
interface))){
2825
/* If interface name is "none", stop bringing up interfaces.
2826
Also remove all instances of "none" from the list */
2827
if(strcmp(interface, "none") == 0){
2828
argz_delete(&mc.interfaces, &mc.interfaces_size,
2829
interface);
2830
interface = NULL;
2831
while((interface = argz_next(mc.interfaces,
2832
mc.interfaces_size, interface))){
2833
if(strcmp(interface, "none") == 0){
2834
argz_delete(&mc.interfaces, &mc.interfaces_size,
2835
interface);
2836
interface = NULL;
2837
}
2838
}
2839
break;
2840
}
2841
bool interface_was_up = interface_is_up(interface);
2842
errno = bring_up_interface(interface, delay);
2843
if(not interface_was_up){
2844
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2847
} else {
2848
errno = argz_add(&interfaces_to_take_down,
2849
&interfaces_to_take_down_size,
2850
interface);
2851
if(errno != 0){
2852
perror_plus("argz_add");
2853
}
2854
}
2855
}
2856
}
2857
if(debug and (interfaces_to_take_down == NULL)){
2858
fprintf_plus(stderr, "No interfaces were brought up\n");
2859
}
2860
}
2861
2862
/* If we only got one interface, explicitly use only that one */
2863
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2864
if(debug){
2865
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2866
mc.interfaces);
2867
}
2868
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1897
/* Lower privileges permanently */
1898
ret = setuid(uid);
1899
if(ret == -1){
1900
perror_plus("setuid");
1901
}
1902
}
2869
1903
}
2870
1904
2871
1905
if(quit_now){
2872
1906
goto end;
2873
1907
}
2874
1908
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1909
ret = init_gnutls_global(pubkey, seckey);
2876
1910
if(ret == -1){
2877
fprintf_plus(stderr, "init_gnutls_global failed\n");
1911
fprintf(stderr, "init_gnutls_global failed\n");
2878
1912
exitcode = EX_UNAVAILABLE;
2879
1913
goto end;
2880
1914
} else {
2885
1919
goto end;
2886
1920
}
2887
1921
2888
/* Try /run/tmp before /tmp */
2889
tempdir = mkdtemp(run_tempdir);
2890
if(tempdir == NULL and errno == ENOENT){
2891
if(debug){
2892
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2893
run_tempdir, old_tempdir);
2894
}
2895
tempdir = mkdtemp(old_tempdir);
2896
}
2897
if(tempdir == NULL){
1922
if(mkdtemp(tempdir) == NULL){
2898
1923
perror_plus("mkdtemp");
2899
1924
goto end;
2900
1925
}
1926
tempdir_created = true;
2901
1927
2902
1928
if(quit_now){
2903
1929
goto end;
2904
1930
}
2905
1931
2906
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2907
fprintf_plus(stderr, "init_gpgme failed\n");
1932
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
fprintf(stderr, "init_gpgme failed\n");
2908
1934
exitcode = EX_UNAVAILABLE;
2909
1935
goto end;
2910
1936
} else {
2919
1945
/* Connect directly, do not use Zeroconf */
2920
1946
/* (Mainly meant for debugging) */
2921
1947
char *address = strrchr(connect_to, ':');
2922
2923
1948
if(address == NULL){
2924
fprintf_plus(stderr, "No colon in address\n");
1949
fprintf(stderr, "No colon in address\n");
2925
1950
exitcode = EX_USAGE;
2926
1951
goto end;
2927
1952
}
2930
1955
goto end;
2931
1956
}
2932
1957
2933
in_port_t port;
1958
uint16_t port;
2934
1959
errno = 0;
2935
1960
tmpmax = strtoimax(address+1, &tmp, 10);
2936
1961
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2937
or tmpmax != (in_port_t)tmpmax){
2938
fprintf_plus(stderr, "Bad port number\n");
1962
or tmpmax != (uint16_t)tmpmax){
1963
fprintf(stderr, "Bad port number\n");
2939
1964
exitcode = EX_USAGE;
2940
1965
goto end;
2941
1966
}
2942
1967
2943
1968
if(quit_now){
2944
1969
goto end;
2945
1970
}
2946
1971
2947
port = (in_port_t)tmpmax;
1972
port = (uint16_t)tmpmax;
2948
1973
*address = '\0';
2949
1974
/* Colon in address indicates IPv6 */
2950
1975
int af;
2966
1991
}
2967
1992
2968
1993
while(not quit_now){
2969
ret = start_mandos_communication(address, port, if_index, af,
2970
&mc);
1994
ret = start_mandos_communication(address, port, if_index, af);
2971
1995
if(quit_now or ret == 0){
2972
1996
break;
2973
1997
}
2974
1998
if(debug){
2975
fprintf_plus(stderr, "Retrying in %d seconds\n",
2976
(int)retry_interval);
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2977
2001
}
2978
sleep((unsigned int)retry_interval);
2002
sleep((int)retry_interval);
2979
2003
}
2980
2004
2981
if(not quit_now){
2005
if (not quit_now){
2982
2006
exitcode = EXIT_SUCCESS;
2983
2007
}
2984
2008
2999
2023
config.publish_domain = 0;
3000
2024
3001
2025
/* Allocate a new server */
3002
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
2026
mc.server = avahi_server_new(avahi_simple_poll_get
2027
(mc.simple_poll), &config, NULL,
2028
NULL, &error);
3004
2029
3005
2030
/* Free the Avahi configuration data */
3006
2031
avahi_server_config_free(&config);
3008
2033
3009
2034
/* Check if creating the Avahi server object succeeded */
3010
2035
if(mc.server == NULL){
3011
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3012
avahi_strerror(ret));
2036
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
avahi_strerror(error));
3013
2038
exitcode = EX_UNAVAILABLE;
3014
2039
goto end;
3015
2040
}
3021
2046
/* Create the Avahi service browser */
3022
2047
sb = avahi_s_service_browser_new(mc.server, if_index,
3023
2048
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3024
NULL, 0, browse_callback,
3025
(void *)&mc);
2049
NULL, 0, browse_callback, NULL);
3026
2050
if(sb == NULL){
3027
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3028
avahi_strerror(avahi_server_errno(mc.server)));
2051
fprintf(stderr, "Failed to create service browser: %s\n",
2052
avahi_strerror(avahi_server_errno(mc.server)));
3029
2053
exitcode = EX_UNAVAILABLE;
3030
2054
goto end;
3031
2055
}
3037
2061
/* Run the main loop */
3038
2062
3039
2063
if(debug){
3040
fprintf_plus(stderr, "Starting Avahi loop search\n");
2064
fprintf(stderr, "Starting Avahi loop search\n");
3041
2065
}
3042
3043
ret = avahi_loop_with_timeout(simple_poll,
3044
(int)(retry_interval * 1000), &mc);
2066
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
3045
2069
if(debug){
3046
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3047
(ret == 0) ? "successfully" : "with error");
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
3048
2072
}
3049
2073
3050
2074
end:
3051
2075
3052
2076
if(debug){
3053
if(signal_received){
3054
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3055
argv[0], signal_received,
3056
strsignal(signal_received));
3057
} else {
3058
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3059
}
2077
fprintf(stderr, "%s exiting\n", argv[0]);
3060
2078
}
3061
2079
3062
2080
/* Cleanup things */
3063
free(mc.interfaces);
3064
3065
2081
if(sb != NULL)
3066
2082
avahi_s_service_browser_free(sb);
3067
2083
3068
2084
if(mc.server != NULL)
3069
2085
avahi_server_free(mc.server);
3070
2086
3071
if(simple_poll != NULL)
3072
avahi_simple_poll_free(simple_poll);
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
3073
2089
3074
2090
if(gnutls_initialized){
3075
2091
gnutls_certificate_free_credentials(mc.cred);
2092
gnutls_global_deinit();
3076
2093
gnutls_dh_params_deinit(mc.dh_params);
3077
2094
}
3078
2095
3079
2096
if(gpgme_initialized){
3080
2097
gpgme_release(mc.ctx);
3081
2098
}
3082
2099
3083
2100
/* Cleans up the circular linked list of Mandos servers the client
3084
2101
has seen */
3085
2102
if(mc.current_server != NULL){
3086
2103
mc.current_server->prev->next = NULL;
3087
2104
while(mc.current_server != NULL){
3088
2105
server *next = mc.current_server->next;
3089
#ifdef __GNUC__
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3092
#endif
3093
free((char *)(mc.current_server->ip));
3094
#ifdef __GNUC__
3095
#pragma GCC diagnostic pop
3096
#endif
3097
2106
free(mc.current_server);
3098
2107
mc.current_server = next;
3099
2108
}
3100
2109
}
3101
2110
3102
/* Re-raise privileges */
3103
{
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
3107
perror_plus("Failed to raise privileges");
3108
} else {
3109
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3113
3114
/* Take down the network interfaces which were brought up */
3115
{
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3119
interface))){
3120
ret = take_down_interface(interface);
3121
if(ret != 0){
3122
errno = ret;
3123
perror_plus("Failed to take down interface");
3124
}
3125
}
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
fprintf_plus(stderr, "No interfaces needed to be taken"
3128
" down\n");
3129
}
3130
}
2111
/* XXX run network hooks "stop" here */
2112
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2116
errno = 0;
2117
ret = seteuid(0);
2118
if(ret == -1){
2119
perror_plus("seteuid");
3131
2120
}
3132
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
3136
perror_plus("Failed to lower privileges permanently");
2121
if(geteuid() == 0){
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2123
if(ret == -1){
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2128
if(ret == -1){
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2130
}
2131
}
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2133
if(ret == -1){
2134
perror_plus("close");
2135
}
2136
/* Lower privileges permanently */
2137
errno = 0;
2138
ret = setuid(uid);
2139
if(ret == -1){
2140
perror_plus("setuid");
2141
}
3137
2142
}
3138
2143
}
3139
2144
3140
free(interfaces_to_take_down);
3141
free(interfaces_hooks);
3142
3143
void clean_dir_at(int base, const char * const dirname,
3144
uintmax_t level){
2145
/* Removes the GPGME temp directory and all files inside */
2146
if(tempdir_created){
3145
2147
struct dirent **direntries = NULL;
3146
int dret;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3148
O_RDONLY
3149
| O_NOFOLLOW
3150
| O_DIRECTORY
3151
| O_PATH));
3152
if(dir_fd == -1){
3153
perror_plus("open");
3154
return;
3155
}
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
2148
struct dirent *direntry = NULL;
2149
int numentries = scandir(tempdir, &direntries, notdotentries,
2150
alphasort);
2151
if (numentries > 0){
3159
2152
for(int i = 0; i < numentries; i++){
3160
if(debug){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3163
}
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3165
if(dret == -1){
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3168
AT_REMOVEDIR);
3169
}
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3175
dret = 0;
3176
}
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3180
}
3181
}
3182
free(direntries[i]);
3183
}
3184
3185
/* need to clean even if 0 because man page doesn't specify */
3186
free(direntries);
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3190
}
3191
} else {
3192
perror_plus("scandirat");
3193
}
3194
close(dir_fd);
3195
}
3196
3197
/* Removes the GPGME temp directory and all files inside */
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
2153
direntry = direntries[i];
2154
char *fullname = NULL;
2155
ret = asprintf(&fullname, "%s/%s", tempdir,
2156
direntry->d_name);
2157
if(ret < 0){
2158
perror_plus("asprintf");
2159
continue;
2160
}
2161
ret = remove(fullname);
2162
if(ret == -1){
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2164
strerror(errno));
2165
}
2166
free(fullname);
2167
}
2168
}
2169
2170
/* need to clean even if 0 because man page doesn't specify */
2171
free(direntries);
2172
if (numentries == -1){
2173
perror_plus("scandir");
2174
}
2175
ret = rmdir(tempdir);
2176
if(ret == -1 and errno != ENOENT){
2177
perror_plus("rmdir");
2178
}
3200
2179
}
3201
2180
3202
2181
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0