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- Committer: Teddy Hogeborn
- Date: 2009-04-17 08:26:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20090417082617-eltetak5lzjyz55o
* initramfs-tools-hook: Bug fix: Add "--userid" and "--groupid" to
start of "plugin-runner.conf" file instead of
appending, to allow any preexisting options to
override.
* plugin-runner.conf: Improved wording.
start of "plugin-runner.conf" file instead of
appending, to allow any preexisting options to
override.
* plugin-runner.conf: Improved wording.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
31
30
*/
32
31
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
56
54
SOCK_STREAM, uid_t, gid_t, open(),
57
55
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
68
SIOCSIFFLAGS, if_indextoname(),
76
69
if_nametoindex(), IF_NAMESIZE */
78
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
88
80
argp_parse(), ARGP_KEY_ARG,
89
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
90
82
#include <signal.h> /* sigemptyset(), sigaddset(),
91
sigaction(), SIGTERM, sig_atomic_t,
92
raise() */
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
104
85
105
86
#ifdef __linux__
106
87
#include <sys/klog.h> /* klogctl() */
124
105
init_gnutls_session(),
125
106
GNUTLS_* */
126
107
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
129
110
130
111
/* GPGME */
131
112
#include <gpgme.h> /* All GPGME types, constants and
139
120
#define PATHDIR "/conf/conf.d/mandos"
140
121
#define SECKEY "seckey.txt"
141
122
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
123
144
124
bool debug = false;
145
125
static const char mandos_protocol_version[] = "1";
146
126
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
157
const char *ip;
158
in_port_t port;
159
AvahiIfIndex if_index;
160
int af;
161
struct timespec last_seen;
162
struct server *next;
163
struct server *prev;
164
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
165
128
166
129
/* Used for passing in values through the Avahi callback functions */
167
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
168
132
AvahiServer *server;
169
133
gnutls_certificate_credentials_t cred;
170
134
unsigned int dh_bits;
171
135
gnutls_dh_params_t dh_params;
172
136
const char *priority;
173
137
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
138
} mandos_context;
178
139
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
181
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
184
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
187
int e = errno;
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
190
errno = e;
191
perror(print_text);
192
}
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
203
144
204
145
/*
205
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
147
* bytes. "buffer_capacity" is how much is currently allocated,
207
148
* "buffer_length" is how much is already used.
208
149
*/
209
__attribute__((nonnull, warn_unused_result))
210
150
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
151
size_t buffer_capacity){
212
152
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;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
219
155
return 0;
220
156
}
221
*buffer = new_buf;
222
157
buffer_capacity += BUFFER_SIZE;
223
158
}
224
159
return buffer_capacity;
225
160
}
226
161
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
231
int ret;
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
235
return false;
236
}
237
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
259
}
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
265
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
273
}
274
275
162
/*
276
163
* Initialize GPGME.
277
164
*/
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){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
283
168
gpgme_error_t rc;
284
169
gpgme_engine_info_t engine_info;
285
170
171
286
172
/*
287
173
* Helper function to insert pub and seckey to the engine keyring.
288
174
*/
289
bool import_key(const char * const filename){
290
int ret;
175
bool import_key(const char *filename){
291
176
int fd;
292
177
gpgme_data_t pgp_data;
293
178
294
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
295
180
if(fd == -1){
296
perror_plus("open");
181
perror("open");
297
182
return false;
298
183
}
299
184
300
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
186
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));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
304
189
return false;
305
190
}
306
191
307
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
308
193
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
311
196
return false;
312
197
}
313
198
314
ret = close(fd);
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
200
if(ret == -1){
316
perror_plus("close");
201
perror("close");
317
202
}
318
203
gpgme_data_release(pgp_data);
319
204
return true;
320
205
}
321
206
322
207
if(debug){
323
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
324
209
}
325
210
326
211
/* Init GPGME */
327
212
gpgme_check_version(NULL);
328
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
329
214
if(rc != GPG_ERR_NO_ERROR){
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
332
217
return false;
333
218
}
334
219
335
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
336
221
rc = gpgme_get_engine_info(&engine_info);
337
222
if(rc != GPG_ERR_NO_ERROR){
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
340
225
return false;
341
226
}
342
227
while(engine_info != NULL){
348
233
engine_info = engine_info->next;
349
234
}
350
235
if(engine_info == NULL){
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
353
237
return false;
354
238
}
355
239
356
240
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
358
242
if(rc != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
362
245
return false;
363
246
}
364
247
366
249
return false;
367
250
}
368
251
369
return true;
252
return true;
370
253
}
371
254
372
255
/*
373
256
* Decrypt OpenPGP data.
374
257
* Returns -1 on error
375
258
*/
376
__attribute__((nonnull, warn_unused_result))
377
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
260
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
261
char **plaintext){
381
262
gpgme_data_t dh_crypto, dh_plain;
382
263
gpgme_error_t rc;
383
264
ssize_t ret;
385
266
ssize_t plaintext_length = 0;
386
267
387
268
if(debug){
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
389
270
}
390
271
391
272
/* Create new GPGME data buffer from memory cryptotext */
392
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
393
274
0);
394
275
if(rc != GPG_ERR_NO_ERROR){
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
397
278
return -1;
398
279
}
399
280
400
281
/* Create new empty GPGME data buffer for the plaintext */
401
282
rc = gpgme_data_new(&dh_plain);
402
283
if(rc != GPG_ERR_NO_ERROR){
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
406
286
gpgme_data_release(dh_crypto);
407
287
return -1;
408
288
}
409
289
410
290
/* Decrypt data from the cryptotext data buffer to the plaintext
411
291
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
293
if(rc != GPG_ERR_NO_ERROR){
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
416
296
plaintext_length = -1;
417
297
if(debug){
418
298
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
420
300
if(result == NULL){
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
422
302
} else {
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
427
fprintf_plus(stderr, "Wrong key usage: %u\n",
428
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
429
307
if(result->file_name != NULL){
430
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
431
309
}
432
310
gpgme_recipient_t recipient;
433
311
recipient = result->recipients;
434
while(recipient != NULL){
435
fprintf_plus(stderr, "Public key algorithm: %s\n",
436
gpgme_pubkey_algo_name
437
(recipient->pubkey_algo));
438
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
439
fprintf_plus(stderr, "Secret key available: %s\n",
440
recipient->status == GPG_ERR_NO_SECKEY
441
? "No" : "Yes");
442
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
443
322
}
444
323
}
445
324
}
447
326
}
448
327
449
328
if(debug){
450
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
451
330
}
452
331
453
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
454
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
455
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
456
335
plaintext_length = -1;
457
336
goto decrypt_end;
458
337
}
460
339
*plaintext = NULL;
461
340
while(true){
462
341
plaintext_capacity = incbuffer(plaintext,
463
(size_t)plaintext_length,
464
plaintext_capacity);
342
(size_t)plaintext_length,
343
plaintext_capacity);
465
344
if(plaintext_capacity == 0){
466
perror_plus("incbuffer");
467
plaintext_length = -1;
468
goto decrypt_end;
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
469
348
}
470
349
471
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
476
355
break;
477
356
}
478
357
if(ret < 0){
479
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
480
359
plaintext_length = -1;
481
360
goto decrypt_end;
482
361
}
484
363
}
485
364
486
365
if(debug){
487
fprintf_plus(stderr, "Decrypted password is: ");
366
fprintf(stderr, "Decrypted password is: ");
488
367
for(ssize_t i = 0; i < plaintext_length; i++){
489
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
490
369
}
501
380
return plaintext_length;
502
381
}
503
382
504
__attribute__((warn_unused_result, const))
505
static const char *safe_string(const char *str){
506
if(str == NULL)
507
return "(unknown)";
508
return str;
509
}
510
511
__attribute__((warn_unused_result))
512
static const char *safer_gnutls_strerror(int value){
513
const char *ret = gnutls_strerror(value);
514
return safe_string(ret);
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
387
ret = "(unknown)";
388
return ret;
515
389
}
516
390
517
391
/* GnuTLS log function callback */
518
__attribute__((nonnull))
519
392
static void debuggnutls(__attribute__((unused)) int level,
520
393
const char* string){
521
fprintf_plus(stderr, "GnuTLS: %s", string);
394
fprintf(stderr, "GnuTLS: %s", string);
522
395
}
523
396
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
525
397
static int init_gnutls_global(const char *pubkeyfilename,
526
const char *seckeyfilename,
527
const char *dhparamsfilename,
528
mandos_context *mc){
398
const char *seckeyfilename){
529
399
int ret;
530
unsigned int uret;
531
400
532
401
if(debug){
533
fprintf_plus(stderr, "Initializing GnuTLS\n");
402
fprintf(stderr, "Initializing GnuTLS\n");
403
}
404
405
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
409
return -1;
534
410
}
535
411
536
412
if(debug){
542
418
}
543
419
544
420
/* OpenPGP credentials */
545
ret = gnutls_certificate_allocate_credentials(&mc->cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
546
422
if(ret != GNUTLS_E_SUCCESS){
547
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
safer_gnutls_strerror(ret));
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
549
429
return -1;
550
430
}
551
431
552
432
if(debug){
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
557
436
}
558
437
559
438
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
439
(mc.cred, pubkeyfilename, seckeyfilename,
561
440
GNUTLS_OPENPGP_FMT_BASE64);
562
441
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
568
447
goto globalfail;
569
448
}
570
449
571
450
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
624
}
625
if(dhparamsfilename == NULL){
626
break;
627
}
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
635
}
636
free(params.data);
637
} while(false);
638
}
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
644
do {
645
int secfile = open(seckeyfilename, O_RDONLY);
646
if(secfile == -1){
647
perror_plus("open");
648
break;
649
}
650
size_t buffer_capacity = 0;
651
while(true){
652
buffer_capacity = incbuffer((char **)&buffer.data,
653
(size_t)buffer.size,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
657
free(buffer.data);
658
buffer.data = NULL;
659
break;
660
}
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
663
BUFFER_SIZE);
664
/* EOF */
665
if(bytes_read == 0){
666
break;
667
}
668
/* check bytes_read for failure */
669
if(bytes_read < 0){
670
perror_plus("read");
671
free(buffer.data);
672
buffer.data = NULL;
673
break;
674
}
675
buffer.size += (unsigned int)bytes_read;
676
}
677
close(secfile);
678
} while(false);
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
682
{
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
687
" structure: %s",
688
safer_gnutls_strerror(ret));
689
free(buffer.data);
690
buffer.data = NULL;
691
} else {
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
697
privkey = NULL;
698
}
699
free(buffer.data);
700
buffer.data = NULL;
701
if(privkey != NULL){
702
/* Use private key to suggest an appropriate
703
sec_param */
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
706
if(debug){
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
710
(sec_param)));
711
}
712
}
713
}
714
}
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
718
if(debug){
719
fprintf_plus(stderr, "Falling back to security parameter"
720
" \"%s\"\n",
721
safe_string(gnutls_sec_param_get_name
722
(sec_param)));
723
}
724
}
725
}
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
727
if(uret != 0){
728
mc->dh_bits = uret;
729
if(debug){
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
mc->dh_bits);
735
}
736
} else {
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
740
(sec_param)),
741
safer_gnutls_strerror(ret));
742
goto globalfail;
743
}
744
} else if(debug){
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
mc->dh_bits);
747
}
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
753
goto globalfail;
754
}
755
}
756
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
757
465
758
466
return 0;
759
467
760
468
globalfail:
761
469
762
gnutls_certificate_free_credentials(mc->cred);
763
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
764
473
return -1;
765
474
}
766
475
767
__attribute__((nonnull, warn_unused_result))
768
static int init_gnutls_session(gnutls_session_t *session,
769
mandos_context *mc){
476
static int init_gnutls_session(gnutls_session_t *session){
770
477
int ret;
771
478
/* GnuTLS session creation */
772
do {
773
ret = gnutls_init(session, GNUTLS_SERVER);
774
if(quit_now){
775
return -1;
776
}
777
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
778
480
if(ret != GNUTLS_E_SUCCESS){
779
fprintf_plus(stderr,
780
"Error in GnuTLS session initialization: %s\n",
781
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
782
483
}
783
484
784
485
{
785
486
const char *err;
786
do {
787
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
788
if(quit_now){
789
gnutls_deinit(*session);
790
return -1;
791
}
792
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
793
488
if(ret != GNUTLS_E_SUCCESS){
794
fprintf_plus(stderr, "Syntax error at: %s\n", err);
795
fprintf_plus(stderr, "GnuTLS error: %s\n",
796
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
797
492
gnutls_deinit(*session);
798
493
return -1;
799
494
}
800
495
}
801
496
802
do {
803
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
804
mc->cred);
805
if(quit_now){
806
gnutls_deinit(*session);
807
return -1;
808
}
809
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
810
499
if(ret != GNUTLS_E_SUCCESS){
811
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
812
safer_gnutls_strerror(ret));
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
813
502
gnutls_deinit(*session);
814
503
return -1;
815
504
}
816
505
817
506
/* ignore client certificate if any. */
818
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
509
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
819
511
820
512
return 0;
821
513
}
824
516
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
825
517
__attribute__((unused)) const char *txt){}
826
518
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
832
if(seteuid(0) == -1){
833
ret = errno;
834
}
835
errno = old_errno;
836
return ret;
837
}
838
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
if(ret != 0){
845
errno = old_errno;
846
return ret;
847
}
848
if(setuid(0) == -1){
849
ret = errno;
850
}
851
errno = old_errno;
852
return ret;
853
}
854
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
860
if(seteuid(uid) == -1){
861
ret = errno;
862
}
863
errno = old_errno;
864
return ret;
865
}
866
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
872
if(setuid(uid) == -1){
873
ret = errno;
874
}
875
errno = old_errno;
876
return ret;
877
}
878
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
882
const char *address,
883
AvahiIfIndex if_index){
884
int ret;
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
891
if(debug){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
894
}
895
return false;
896
}
897
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
901
return false;
902
}
903
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
905
if(devnull == -1){
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
return false;
908
}
909
pid_t pid = fork();
910
if(pid == 0){
911
/* Child */
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
914
if(errno != 0){
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
917
} else {
918
/* Set group */
919
errno = 0;
920
ret = setgid(0);
921
if(ret == -1){
922
perror_plus("setgid");
923
_exit(EX_NOPERM);
924
}
925
/* Reset supplementary groups */
926
errno = 0;
927
ret = setgroups(0, NULL);
928
if(ret == -1){
929
perror_plus("setgroups");
930
_exit(EX_NOPERM);
931
}
932
}
933
ret = dup2(devnull, STDIN_FILENO);
934
if(ret == -1){
935
perror_plus("dup2(devnull, STDIN_FILENO)");
936
_exit(EX_OSERR);
937
}
938
ret = close(devnull);
939
if(ret == -1){
940
perror_plus("close");
941
_exit(EX_OSERR);
942
}
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
944
if(ret == -1){
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
_exit(EX_OSERR);
947
}
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
O_RDONLY
950
| O_DIRECTORY
951
| O_PATH
952
| O_CLOEXEC));
953
if(helperdir_fd == -1){
954
perror_plus("open");
955
_exit(EX_UNAVAILABLE);
956
}
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
helper, O_RDONLY));
959
if(helper_fd == -1){
960
perror_plus("openat");
961
close(helperdir_fd);
962
_exit(EX_UNAVAILABLE);
963
}
964
close(helperdir_fd);
965
#ifdef __GNUC__
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
968
#endif
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
972
environ) == -1){
973
#ifdef __GNUC__
974
#pragma GCC diagnostic pop
975
#endif
976
perror_plus("fexecve");
977
_exit(EXIT_FAILURE);
978
}
979
}
980
if(pid == -1){
981
perror_plus("fork");
982
return false;
983
}
984
int status;
985
pid_t pret = -1;
986
errno = 0;
987
do {
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
995
}
996
if(kill(pid, SIGTERM) == -1){
997
perror_plus("kill");
998
}
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1001
" helper program");
1002
}
1003
return false;
1004
}
1005
} while(pret == -1 and errno == EINTR);
1006
if(pret == -1){
1007
perror_plus("waitpid");
1008
return false;
1009
}
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1014
return false;
1015
}
1016
return true;
1017
}
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1021
return false;
1022
}
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1024
return false;
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1032
}
1033
return add_delete_local_route(true, address, if_index);
1034
}
1035
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1039
if(debug){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1041
}
1042
return add_delete_local_route(false, address, if_index);
1043
}
1044
1045
519
/* Called when a Mandos server is found */
1046
__attribute__((nonnull, warn_unused_result))
1047
static int start_mandos_communication(const char *ip, in_port_t port,
520
static int start_mandos_communication(const char *ip, uint16_t port,
1048
521
AvahiIfIndex if_index,
1049
int af, mandos_context *mc){
1050
int ret, tcp_sd = -1;
522
int af){
523
int ret, tcp_sd;
1051
524
ssize_t sret;
1052
struct sockaddr_storage to;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
1053
529
char *buffer = NULL;
1054
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
1055
531
size_t buffer_length = 0;
1056
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
1057
534
size_t written;
1058
int retval = -1;
535
int retval = 0;
1059
536
gnutls_session_t session;
1060
537
int pf; /* Protocol family */
1061
bool route_added = false;
1062
1063
errno = 0;
1064
1065
if(quit_now){
1066
errno = EINTR;
1067
return -1;
1068
}
1069
538
1070
539
switch(af){
1071
540
case AF_INET6:
1075
544
pf = PF_INET;
1076
545
break;
1077
546
default:
1078
fprintf_plus(stderr, "Bad address family: %d\n", af);
1079
errno = EINVAL;
547
fprintf(stderr, "Bad address family: %d\n", af);
1080
548
return -1;
1081
549
}
1082
550
1083
/* If the interface is specified and we have a list of interfaces */
1084
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1085
/* Check if the interface is one of the interfaces we are using */
1086
bool match = false;
1087
{
1088
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
1092
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
match = true;
1094
break;
1095
}
1096
}
1097
}
1098
if(not match){
1099
/* This interface does not match any in the list, so we don't
1100
connect to the server */
1101
if(debug){
1102
char interface[IF_NAMESIZE];
1103
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1104
perror_plus("if_indextoname");
1105
} else {
1106
fprintf_plus(stderr, "Skipping server on non-used interface"
1107
" \"%s\"\n",
1108
if_indextoname((unsigned int)if_index,
1109
interface));
1110
}
1111
}
1112
return -1;
1113
}
1114
}
1115
1116
ret = init_gnutls_session(&session, mc);
551
ret = init_gnutls_session(&session);
1117
552
if(ret != 0){
1118
553
return -1;
1119
554
}
1120
555
1121
556
if(debug){
1122
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1123
PRIuMAX "\n", ip, (uintmax_t)port);
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
1124
559
}
1125
560
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
1127
562
if(tcp_sd < 0){
1128
int e = errno;
1129
perror_plus("socket");
1130
errno = e;
1131
goto mandos_end;
1132
}
1133
1134
if(quit_now){
1135
errno = EINTR;
1136
goto mandos_end;
1137
}
1138
563
perror("socket");
564
return -1;
565
}
566
567
memset(&to, 0, sizeof(to));
1139
568
if(af == AF_INET6){
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1143
571
} else { /* IPv4 */
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
1147
574
}
1148
575
if(ret < 0 ){
1149
int e = errno;
1150
perror_plus("inet_pton");
1151
errno = e;
1152
goto mandos_end;
576
perror("inet_pton");
577
return -1;
1153
578
}
1154
579
if(ret == 0){
1155
int e = errno;
1156
fprintf_plus(stderr, "Bad address: %s\n", ip);
1157
errno = e;
1158
goto mandos_end;
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
1159
582
}
1160
583
if(af == AF_INET6){
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
1164
591
if(if_index == AVAHI_IF_UNSPEC){
1165
fprintf_plus(stderr, "An IPv6 link-local address is"
1166
" incomplete without a network interface\n");
1167
errno = EINVAL;
1168
goto mandos_end;
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
1169
595
}
1170
596
/* Set the network interface number as scope */
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
597
to.in6.sin6_scope_id = (uint32_t)if_index;
1172
598
}
1173
599
} else {
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
1175
}
1176
1177
if(quit_now){
1178
errno = EINTR;
1179
goto mandos_end;
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
1180
603
}
1181
604
1182
605
if(debug){
1183
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1184
607
char interface[IF_NAMESIZE];
1185
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1186
perror_plus("if_indextoname");
609
perror("if_indextoname");
1187
610
} else {
1188
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1189
"\n", ip, interface, (uintmax_t)port);
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
1190
613
}
1191
614
} else {
1192
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1193
ip, (uintmax_t)port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
1194
617
}
1195
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1196
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1197
if(af == AF_INET6){
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in6),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
} else {
1203
ret = getnameinfo((struct sockaddr *)&to,
1204
sizeof(struct sockaddr_in),
1205
addrstr, sizeof(addrstr), NULL, 0,
1206
NI_NUMERICHOST);
1207
}
1208
if(ret == EAI_SYSTEM){
1209
perror_plus("getnameinfo");
1210
} else if(ret != 0) {
1211
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1212
} else if(strcmp(addrstr, ip) != 0){
1213
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
}
1215
}
1216
1217
if(quit_now){
1218
errno = EINTR;
1219
goto mandos_end;
1220
}
1221
1222
while(true){
1223
if(af == AF_INET6){
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1226
} else {
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1229
}
1230
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1237
&to)->sin6_addr)))
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1248
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1252
*/
1253
if(debug){
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1255
" direct route\n");
1256
}
1257
int e = errno;
1258
route_added = add_local_route(ip, if_index);
1259
if(route_added){
1260
continue;
1261
}
1262
errno = e;
1263
}
1264
if(errno != ECONNREFUSED or debug){
1265
int e = errno;
1266
perror_plus("connect");
1267
errno = e;
1268
}
1269
goto mandos_end;
1270
}
1271
1272
if(quit_now){
1273
errno = EINTR;
1274
goto mandos_end;
1275
}
1276
break;
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
629
perror("inet_ntop");
630
} else {
631
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
633
}
634
}
635
}
636
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
643
perror("connect");
644
return -1;
1277
645
}
1278
646
1279
647
const char *out = mandos_protocol_version;
1281
649
while(true){
1282
650
size_t out_size = strlen(out);
1283
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1284
out_size - written));
652
out_size - written));
1285
653
if(ret == -1){
1286
int e = errno;
1287
perror_plus("write");
1288
errno = e;
654
perror("write");
655
retval = -1;
1289
656
goto mandos_end;
1290
657
}
1291
658
written += (size_t)ret;
1299
666
break;
1300
667
}
1301
668
}
1302
1303
if(quit_now){
1304
errno = EINTR;
1305
goto mandos_end;
1306
}
1307
669
}
1308
670
1309
671
if(debug){
1310
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1311
}
1312
1313
if(quit_now){
1314
errno = EINTR;
1315
goto mandos_end;
1316
}
1317
1318
/* This casting via intptr_t is to eliminate warning about casting
1319
an int to a pointer type. This is exactly how the GnuTLS Guile
1320
function "set-session-transport-fd!" does it. */
1321
gnutls_transport_set_ptr(session,
1322
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1323
1324
if(quit_now){
1325
errno = EINTR;
1326
goto mandos_end;
1327
}
1328
1329
do {
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
1330
678
ret = gnutls_handshake(session);
1331
if(quit_now){
1332
errno = EINTR;
1333
goto mandos_end;
1334
}
1335
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1336
680
1337
681
if(ret != GNUTLS_E_SUCCESS){
1338
682
if(debug){
1339
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1340
684
gnutls_perror(ret);
1341
685
}
1342
errno = EPROTO;
686
retval = -1;
1343
687
goto mandos_end;
1344
688
}
1345
689
1346
690
/* Read OpenPGP packet that contains the wanted password */
1347
691
1348
692
if(debug){
1349
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1350
" %s\n", ip);
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
1351
695
}
1352
696
1353
697
while(true){
1354
1355
if(quit_now){
1356
errno = EINTR;
1357
goto mandos_end;
1358
}
1359
1360
698
buffer_capacity = incbuffer(&buffer, buffer_length,
1361
buffer_capacity);
699
buffer_capacity);
1362
700
if(buffer_capacity == 0){
1363
int e = errno;
1364
perror_plus("incbuffer");
1365
errno = e;
1366
goto mandos_end;
1367
}
1368
1369
if(quit_now){
1370
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
1371
703
goto mandos_end;
1372
704
}
1373
705
1382
714
case GNUTLS_E_AGAIN:
1383
715
break;
1384
716
case GNUTLS_E_REHANDSHAKE:
1385
do {
717
do{
1386
718
ret = gnutls_handshake(session);
1387
1388
if(quit_now){
1389
errno = EINTR;
1390
goto mandos_end;
1391
}
1392
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1393
720
if(ret < 0){
1394
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1395
"***\n");
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1396
722
gnutls_perror(ret);
1397
errno = EPROTO;
723
retval = -1;
1398
724
goto mandos_end;
1399
725
}
1400
726
break;
1401
727
default:
1402
fprintf_plus(stderr, "Unknown error while reading data from"
1403
" encrypted session with Mandos server\n");
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
1404
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1405
errno = EIO;
1406
732
goto mandos_end;
1407
733
}
1408
734
} else {
1411
737
}
1412
738
1413
739
if(debug){
1414
fprintf_plus(stderr, "Closing TLS session\n");
1415
}
1416
1417
if(quit_now){
1418
errno = EINTR;
1419
goto mandos_end;
1420
}
1421
1422
do {
1423
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1424
if(quit_now){
1425
errno = EINTR;
1426
goto mandos_end;
1427
}
1428
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1429
744
1430
745
if(buffer_length > 0){
1431
ssize_t decrypted_buffer_size;
1432
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1433
&decrypted_buffer, mc);
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
748
&decrypted_buffer);
1434
749
if(decrypted_buffer_size >= 0){
1435
1436
clearerr(stdout);
1437
750
written = 0;
1438
751
while(written < (size_t) decrypted_buffer_size){
1439
if(quit_now){
1440
errno = EINTR;
1441
goto mandos_end;
1442
}
1443
1444
752
ret = (int)fwrite(decrypted_buffer + written, 1,
1445
753
(size_t)decrypted_buffer_size - written,
1446
754
stdout);
1447
755
if(ret == 0 and ferror(stdout)){
1448
int e = errno;
1449
756
if(debug){
1450
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1451
strerror(errno));
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
1452
759
}
1453
errno = e;
1454
goto mandos_end;
760
retval = -1;
761
break;
1455
762
}
1456
763
written += (size_t)ret;
1457
764
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
1468
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
1469
768
}
769
} else {
770
retval = -1;
1470
771
}
1471
772
1472
773
/* Shutdown procedure */
1473
774
1474
775
mandos_end:
1475
{
1476
if(route_added){
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1479
" interface %d", ip, if_index);
1480
}
1481
}
1482
int e = errno;
1483
free(decrypted_buffer);
1484
free(buffer);
1485
if(tcp_sd >= 0){
1486
ret = close(tcp_sd);
1487
}
1488
if(ret == -1){
1489
if(e == 0){
1490
e = errno;
1491
}
1492
perror_plus("close");
1493
}
1494
gnutls_deinit(session);
1495
errno = e;
1496
if(quit_now){
1497
errno = EINTR;
1498
retval = -1;
1499
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1500
780
}
781
gnutls_deinit(session);
1501
782
return retval;
1502
783
}
1503
784
1514
795
AVAHI_GCC_UNUSED AvahiStringList *txt,
1515
796
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1516
797
flags,
1517
void *mc){
1518
if(r == NULL){
1519
return;
1520
}
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
1521
800
1522
801
/* Called whenever a service has been resolved successfully or
1523
802
timed out */
1524
803
1525
if(quit_now){
1526
avahi_s_service_resolver_free(r);
1527
return;
1528
}
1529
1530
804
switch(event){
1531
805
default:
1532
806
case AVAHI_RESOLVER_FAILURE:
1533
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1534
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1535
domain,
1536
avahi_strerror(avahi_server_errno
1537
(((mandos_context*)mc)->server)));
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1538
810
break;
1539
811
1540
812
case AVAHI_RESOLVER_FOUND:
1542
814
char ip[AVAHI_ADDRESS_STR_MAX];
1543
815
avahi_address_snprint(ip, sizeof(ip), address);
1544
816
if(debug){
1545
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1546
PRIdMAX ") on port %" PRIu16 "\n", name,
1547
host_name, ip, (intmax_t)interface, port);
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1548
820
}
1549
int ret = start_mandos_communication(ip, (in_port_t)port,
1550
interface,
1551
avahi_proto_to_af(proto),
1552
mc);
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
1553
823
if(ret == 0){
1554
avahi_simple_poll_quit(simple_poll);
1555
} else {
1556
if(not add_server(ip, (in_port_t)port, interface,
1557
avahi_proto_to_af(proto),
1558
&((mandos_context*)mc)->current_server)){
1559
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1560
" list\n", name);
1561
}
824
avahi_simple_poll_quit(mc.simple_poll);
1562
825
}
1563
826
}
1564
827
}
1574
837
const char *domain,
1575
838
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1576
839
flags,
1577
void *mc){
1578
if(b == NULL){
1579
return;
1580
}
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
1581
842
1582
843
/* Called whenever a new services becomes available on the LAN or
1583
844
is removed from the LAN */
1584
845
1585
if(quit_now){
1586
return;
1587
}
1588
1589
846
switch(event){
1590
847
default:
1591
848
case AVAHI_BROWSER_FAILURE:
1592
849
1593
fprintf_plus(stderr, "(Avahi browser) %s\n",
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
1596
avahi_simple_poll_quit(simple_poll);
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
1597
853
return;
1598
854
1599
855
case AVAHI_BROWSER_NEW:
1602
858
the callback function is called the Avahi server will free the
1603
859
resolver for us. */
1604
860
1605
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1606
interface, protocol, name, type,
1607
domain, protocol, 0,
1608
resolve_callback, mc) == NULL)
1609
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1610
" %s\n", name,
1611
avahi_strerror(avahi_server_errno
1612
(((mandos_context*)mc)->server)));
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1613
866
break;
1614
867
1615
868
case AVAHI_BROWSER_REMOVE:
1618
871
case AVAHI_BROWSER_ALL_FOR_NOW:
1619
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1620
873
if(debug){
1621
fprintf_plus(stderr, "No Mandos server found, still"
1622
" searching...\n");
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1623
875
}
1624
876
break;
1625
877
}
1626
878
}
1627
879
1628
/* Signal handler that stops main loop after SIGTERM */
1629
static void handle_sigterm(int sig){
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1630
884
if(quit_now){
1631
885
return;
1632
886
}
1633
887
quit_now = 1;
1634
signal_received = sig;
1635
int old_errno = errno;
1636
/* set main loop to exit */
1637
if(simple_poll != NULL){
1638
avahi_simple_poll_quit(simple_poll);
1639
}
1640
errno = old_errno;
1641
}
1642
1643
__attribute__((nonnull, warn_unused_result))
1644
bool get_flags(const char *ifname, struct ifreq *ifr){
1645
int ret;
1646
int old_errno;
1647
1648
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1649
if(s < 0){
1650
old_errno = errno;
1651
perror_plus("socket");
1652
errno = old_errno;
1653
return false;
1654
}
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1657
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1658
if(ret == -1){
1659
if(debug){
1660
old_errno = errno;
1661
perror_plus("ioctl SIOCGIFFLAGS");
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1668
}
1669
return false;
1670
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1676
return true;
1677
}
1678
1679
__attribute__((nonnull, warn_unused_result))
1680
bool good_flags(const char *ifname, const struct ifreq *ifr){
1681
1682
/* Reject the loopback device */
1683
if(ifr->ifr_flags & IFF_LOOPBACK){
1684
if(debug){
1685
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1686
ifname);
1687
}
1688
return false;
1689
}
1690
/* Accept point-to-point devices only if connect_to is specified */
1691
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1692
if(debug){
1693
fprintf_plus(stderr, "Accepting point-to-point interface"
1694
" \"%s\"\n", ifname);
1695
}
1696
return true;
1697
}
1698
/* Otherwise, reject non-broadcast-capable devices */
1699
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1700
if(debug){
1701
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1702
" \"%s\"\n", ifname);
1703
}
1704
return false;
1705
}
1706
/* Reject non-ARP interfaces (including dummy interfaces) */
1707
if(ifr->ifr_flags & IFF_NOARP){
1708
if(debug){
1709
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1710
ifname);
1711
}
1712
return false;
1713
}
1714
1715
/* Accept this device */
1716
if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1718
}
1719
return true;
1720
}
1721
1722
/*
1723
* This function determines if a directory entry in /sys/class/net
1724
* corresponds to an acceptable network device.
1725
* (This function is passed to scandir(3) as a filter function.)
1726
*/
1727
__attribute__((nonnull, warn_unused_result))
1728
int good_interface(const struct dirent *if_entry){
1729
if(if_entry->d_name[0] == '.'){
1730
return 0;
1731
}
1732
1733
struct ifreq ifr;
1734
if(not get_flags(if_entry->d_name, &ifr)){
1735
if(debug){
1736
fprintf_plus(stderr, "Failed to get flags for interface "
1737
"\"%s\"\n", if_entry->d_name);
1738
}
1739
return 0;
1740
}
1741
1742
if(not good_flags(if_entry->d_name, &ifr)){
1743
return 0;
1744
}
1745
return 1;
1746
}
1747
1748
/*
1749
* This function determines if a network interface is up.
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_up(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_UP);
1763
}
1764
1765
/*
1766
* This function determines if a network interface is running
1767
*/
1768
__attribute__((nonnull, warn_unused_result))
1769
bool interface_is_running(const char *interface){
1770
struct ifreq ifr;
1771
if(not get_flags(interface, &ifr)){
1772
if(debug){
1773
fprintf_plus(stderr, "Failed to get flags for interface "
1774
"\"%s\"\n", interface);
1775
}
1776
return false;
1777
}
1778
1779
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1780
}
1781
1782
__attribute__((nonnull, pure, warn_unused_result))
1783
int notdotentries(const struct dirent *direntry){
1784
/* Skip "." and ".." */
1785
if(direntry->d_name[0] == '.'
1786
and (direntry->d_name[1] == '\0'
1787
or (direntry->d_name[1] == '.'
1788
and direntry->d_name[2] == '\0'))){
1789
return 0;
1790
}
1791
return 1;
1792
}
1793
1794
/* Is this directory entry a runnable program? */
1795
__attribute__((nonnull, warn_unused_result))
1796
int runnable_hook(const struct dirent *direntry){
1797
int ret;
1798
size_t sret;
1799
struct stat st;
1800
1801
if((direntry->d_name)[0] == '\0'){
1802
/* Empty name? */
1803
return 0;
1804
}
1805
1806
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1807
"abcdefghijklmnopqrstuvwxyz"
1808
"0123456789"
1809
"_.-");
1810
if((direntry->d_name)[sret] != '\0'){
1811
/* Contains non-allowed characters */
1812
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1814
direntry->d_name);
1815
}
1816
return 0;
1817
}
1818
1819
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1820
if(ret == -1){
1821
if(debug){
1822
perror_plus("Could not stat hook");
1823
}
1824
return 0;
1825
}
1826
if(not (S_ISREG(st.st_mode))){
1827
/* Not a regular file */
1828
if(debug){
1829
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1830
direntry->d_name);
1831
}
1832
return 0;
1833
}
1834
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1835
/* Not executable */
1836
if(debug){
1837
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1838
direntry->d_name);
1839
}
1840
return 0;
1841
}
1842
if(debug){
1843
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1844
direntry->d_name);
1845
}
1846
return 1;
1847
}
1848
1849
__attribute__((nonnull, warn_unused_result))
1850
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1851
mandos_context *mc){
1852
int ret;
1853
struct timespec now;
1854
struct timespec waited_time;
1855
intmax_t block_time;
1856
1857
while(true){
1858
if(mc->current_server == NULL){
1859
if(debug){
1860
fprintf_plus(stderr, "Wait until first server is found."
1861
" No timeout!\n");
1862
}
1863
ret = avahi_simple_poll_iterate(s, -1);
1864
} else {
1865
if(debug){
1866
fprintf_plus(stderr, "Check current_server if we should run"
1867
" it, or wait\n");
1868
}
1869
/* the current time */
1870
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1871
if(ret == -1){
1872
perror_plus("clock_gettime");
1873
return -1;
1874
}
1875
/* Calculating in ms how long time between now and server
1876
who we visted longest time ago. Now - last seen. */
1877
waited_time.tv_sec = (now.tv_sec
1878
- mc->current_server->last_seen.tv_sec);
1879
waited_time.tv_nsec = (now.tv_nsec
1880
- mc->current_server->last_seen.tv_nsec);
1881
/* total time is 10s/10,000ms.
1882
Converting to s from ms by dividing by 1,000,
1883
and ns to ms by dividing by 1,000,000. */
1884
block_time = ((retry_interval
1885
- ((intmax_t)waited_time.tv_sec * 1000))
1886
- ((intmax_t)waited_time.tv_nsec / 1000000));
1887
1888
if(debug){
1889
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1890
block_time);
1891
}
1892
1893
if(block_time <= 0){
1894
ret = start_mandos_communication(mc->current_server->ip,
1895
mc->current_server->port,
1896
mc->current_server->if_index,
1897
mc->current_server->af, mc);
1898
if(ret == 0){
1899
avahi_simple_poll_quit(s);
1900
return 0;
1901
}
1902
ret = clock_gettime(CLOCK_MONOTONIC,
1903
&mc->current_server->last_seen);
1904
if(ret == -1){
1905
perror_plus("clock_gettime");
1906
return -1;
1907
}
1908
mc->current_server = mc->current_server->next;
1909
block_time = 0; /* Call avahi to find new Mandos
1910
servers, but don't block */
1911
}
1912
1913
ret = avahi_simple_poll_iterate(s, (int)block_time);
1914
}
1915
if(ret != 0){
1916
if(ret > 0 or errno != EINTR){
1917
return (ret != 1) ? ret : 0;
1918
}
1919
}
1920
}
1921
}
1922
1923
__attribute__((nonnull))
1924
void run_network_hooks(const char *mode, const char *interface,
1925
const float delay){
1926
struct dirent **direntries = NULL;
1927
if(hookdir_fd == -1){
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1929
| O_CLOEXEC);
1930
if(hookdir_fd == -1){
1931
if(errno == ENOENT){
1932
if(debug){
1933
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1934
" found\n", hookdir);
1935
}
1936
} else {
1937
perror_plus("open");
1938
}
1939
return;
1940
}
1941
}
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
runnable_hook, alphasort);
1949
if(numhooks == -1){
1950
perror_plus("scandir");
1951
close(devnull);
1952
return;
1953
}
1954
struct dirent *direntry;
1955
int ret;
1956
for(int i = 0; i < numhooks; i++){
1957
direntry = direntries[i];
1958
if(debug){
1959
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1960
direntry->d_name);
1961
}
1962
pid_t hook_pid = fork();
1963
if(hook_pid == 0){
1964
/* Child */
1965
/* Raise privileges */
1966
errno = raise_privileges_permanently();
1967
if(errno != 0){
1968
perror_plus("Failed to raise privileges");
1969
_exit(EX_NOPERM);
1970
}
1971
/* Set group */
1972
errno = 0;
1973
ret = setgid(0);
1974
if(ret == -1){
1975
perror_plus("setgid");
1976
_exit(EX_NOPERM);
1977
}
1978
/* Reset supplementary groups */
1979
errno = 0;
1980
ret = setgroups(0, NULL);
1981
if(ret == -1){
1982
perror_plus("setgroups");
1983
_exit(EX_NOPERM);
1984
}
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1986
if(ret == -1){
1987
perror_plus("setenv");
1988
_exit(EX_OSERR);
1989
}
1990
ret = setenv("DEVICE", interface, 1);
1991
if(ret == -1){
1992
perror_plus("setenv");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1996
if(ret == -1){
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
ret = setenv("MODE", mode, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
char *delaystring;
2006
ret = asprintf(&delaystring, "%f", (double)delay);
2007
if(ret == -1){
2008
perror_plus("asprintf");
2009
_exit(EX_OSERR);
2010
}
2011
ret = setenv("DELAY", delaystring, 1);
2012
if(ret == -1){
2013
free(delaystring);
2014
perror_plus("setenv");
2015
_exit(EX_OSERR);
2016
}
2017
free(delaystring);
2018
if(connect_to != NULL){
2019
ret = setenv("CONNECT", connect_to, 1);
2020
if(ret == -1){
2021
perror_plus("setenv");
2022
_exit(EX_OSERR);
2023
}
2024
}
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2026
direntry->d_name,
2027
O_RDONLY));
2028
if(hook_fd == -1){
2029
perror_plus("openat");
2030
_exit(EXIT_FAILURE);
2031
}
2032
if(close(hookdir_fd) == -1){
2033
perror_plus("close");
2034
_exit(EXIT_FAILURE);
2035
}
2036
ret = dup2(devnull, STDIN_FILENO);
2037
if(ret == -1){
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
_exit(EX_OSERR);
2040
}
2041
ret = close(devnull);
2042
if(ret == -1){
2043
perror_plus("close");
2044
_exit(EX_OSERR);
2045
}
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2047
if(ret == -1){
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
_exit(EX_OSERR);
2050
}
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2052
environ) == -1){
2053
perror_plus("fexecve");
2054
_exit(EXIT_FAILURE);
2055
}
2056
} else {
2057
if(hook_pid == -1){
2058
perror_plus("fork");
2059
free(direntry);
2060
continue;
2061
}
2062
int status;
2063
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2064
perror_plus("waitpid");
2065
free(direntry);
2066
continue;
2067
}
2068
if(WIFEXITED(status)){
2069
if(WEXITSTATUS(status) != 0){
2070
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2071
" with status %d\n", direntry->d_name,
2072
WEXITSTATUS(status));
2073
free(direntry);
2074
continue;
2075
}
2076
} else if(WIFSIGNALED(status)){
2077
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2078
" signal %d\n", direntry->d_name,
2079
WTERMSIG(status));
2080
free(direntry);
2081
continue;
2082
} else {
2083
fprintf_plus(stderr, "Warning: network hook \"%s\""
2084
" crashed\n", direntry->d_name);
2085
free(direntry);
2086
continue;
2087
}
2088
}
2089
if(debug){
2090
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2091
direntry->d_name);
2092
}
2093
free(direntry);
2094
}
2095
free(direntries);
2096
if(close(hookdir_fd) == -1){
2097
perror_plus("close");
2098
} else {
2099
hookdir_fd = -1;
2100
}
2101
close(devnull);
2102
}
2103
2104
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
2108
int ret;
2109
struct ifreq network;
2110
unsigned int if_index = if_nametoindex(interface);
2111
if(if_index == 0){
2112
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2113
errno = old_errno;
2114
return ENXIO;
2115
}
2116
2117
if(quit_now){
2118
errno = old_errno;
2119
return EINTR;
2120
}
2121
2122
if(not interface_is_up(interface)){
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
2125
if(not get_flags(interface, &network)){
2126
ret_errno = errno;
2127
fprintf_plus(stderr, "Failed to get flags for interface "
2128
"\"%s\"\n", interface);
2129
errno = old_errno;
2130
return ret_errno;
2131
}
2132
network.ifr_flags |= IFF_UP; /* set flag */
2133
2134
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2135
if(sd == -1){
2136
ret_errno = errno;
2137
perror_plus("socket");
2138
errno = old_errno;
2139
return ret_errno;
2140
}
2141
2142
if(quit_now){
2143
ret = close(sd);
2144
if(ret == -1){
2145
perror_plus("close");
2146
}
2147
errno = old_errno;
2148
return EINTR;
2149
}
2150
2151
if(debug){
2152
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2153
interface);
2154
}
2155
2156
/* Raise privileges */
2157
ret_errno = raise_privileges();
2158
if(ret_errno != 0){
2159
errno = ret_errno;
2160
perror_plus("Failed to raise privileges");
2161
}
2162
2163
#ifdef __linux__
2164
int ret_linux;
2165
bool restore_loglevel = false;
2166
if(ret_errno == 0){
2167
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2168
messages about the network interface to mess up the prompt */
2169
ret_linux = klogctl(8, NULL, 5);
2170
if(ret_linux == -1){
2171
perror_plus("klogctl");
2172
} else {
2173
restore_loglevel = true;
2174
}
2175
}
2176
#endif /* __linux__ */
2177
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2178
ioctl_errno = errno;
2179
#ifdef __linux__
2180
if(restore_loglevel){
2181
ret_linux = klogctl(7, NULL, 0);
2182
if(ret_linux == -1){
2183
perror_plus("klogctl");
2184
}
2185
}
2186
#endif /* __linux__ */
2187
2188
/* If raise_privileges() succeeded above */
2189
if(ret_errno == 0){
2190
/* Lower privileges */
2191
ret_errno = lower_privileges();
2192
if(ret_errno != 0){
2193
errno = ret_errno;
2194
perror_plus("Failed to lower privileges");
2195
}
2196
}
2197
2198
/* Close the socket */
2199
ret = close(sd);
2200
if(ret == -1){
2201
perror_plus("close");
2202
}
2203
2204
if(ret_setflags == -1){
2205
errno = ioctl_errno;
2206
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2207
errno = old_errno;
2208
return ioctl_errno;
2209
}
2210
} else if(debug){
2211
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2212
interface);
2213
}
2214
2215
/* Sleep checking until interface is running.
2216
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
2218
if(interface_is_running(interface)){
2219
break;
2220
}
2221
struct timespec sleeptime = { .tv_nsec = 250000000 };
2222
ret = nanosleep(&sleeptime, NULL);
2223
if(ret == -1 and errno != EINTR){
2224
perror_plus("nanosleep");
2225
}
2226
}
2227
2228
errno = old_errno;
2229
return 0;
2230
}
2231
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2235
struct ifreq network;
2236
unsigned int if_index = if_nametoindex(interface);
2237
if(if_index == 0){
2238
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2239
errno = old_errno;
2240
return ENXIO;
2241
}
2242
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network) and debug){
2246
ret_errno = errno;
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
return ret_errno;
2251
}
2252
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2253
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
2256
ret_errno = errno;
2257
perror_plus("socket");
2258
errno = old_errno;
2259
return ret_errno;
2260
}
2261
2262
if(debug){
2263
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2264
interface);
2265
}
2266
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2269
if(ret_errno != 0){
2270
errno = ret_errno;
2271
perror_plus("Failed to raise privileges");
2272
}
2273
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2276
2277
/* If raise_privileges() succeeded above */
2278
if(ret_errno == 0){
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("Failed to lower privileges");
2284
}
2285
}
2286
2287
/* Close the socket */
2288
int ret = close(sd);
2289
if(ret == -1){
2290
perror_plus("close");
2291
}
2292
2293
if(ret_setflags == -1){
2294
errno = ioctl_errno;
2295
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2296
errno = old_errno;
2297
return ioctl_errno;
2298
}
2299
} else if(debug){
2300
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2301
interface);
2302
}
2303
2304
errno = old_errno;
2305
return 0;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
2306
893
}
2307
894
2308
895
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
2314
896
AvahiSServiceBrowser *sb = NULL;
2315
error_t ret_errno;
897
int error;
2316
898
int ret;
2317
899
intmax_t tmpmax;
2318
900
char *tmp;
2319
901
int exitcode = EXIT_SUCCESS;
2320
char *interfaces_to_take_down = NULL;
2321
size_t interfaces_to_take_down_size = 0;
2322
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2323
char old_tempdir[] = "/tmp/mandosXXXXXX";
2324
char *tempdir = NULL;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
2325
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2326
911
const char *seckey = PATHDIR "/" SECKEY;
2327
912
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
char *interfaces_hooks = NULL;
2330
913
2331
914
bool gnutls_initialized = false;
2332
915
bool gpgme_initialized = false;
2333
916
float delay = 2.5f;
2334
double retry_interval = 10; /* 10s between trying a server and
2335
retrying the same server again */
2336
917
2337
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
2338
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2339
920
2340
uid = getuid();
2341
gid = getgid();
2342
2343
/* Lower any group privileges we might have, just to be safe */
2344
errno = 0;
2345
ret = setgid(gid);
2346
if(ret == -1){
2347
perror_plus("setgid");
2348
}
2349
2350
/* Lower user privileges (temporarily) */
2351
errno = 0;
2352
ret = seteuid(uid);
2353
if(ret == -1){
2354
perror_plus("seteuid");
2355
}
2356
2357
if(quit_now){
2358
goto end;
2359
}
2360
2361
921
{
2362
922
struct argp_option options[] = {
2363
923
{ .name = "debug", .key = 128,
2384
944
.doc = "Bit length of the prime number used in the"
2385
945
" Diffie-Hellman key exchange",
2386
946
.group = 2 },
2387
{ .name = "dh-params", .key = 134,
2388
.arg = "FILE",
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2391
.group = 2 },
2392
947
{ .name = "priority", .key = 130,
2393
948
.arg = "STRING",
2394
949
.doc = "GnuTLS priority string for the TLS handshake",
2397
952
.arg = "SECONDS",
2398
953
.doc = "Maximum delay to wait for interface startup",
2399
954
.group = 2 },
2400
{ .name = "retry", .key = 132,
2401
.arg = "SECONDS",
2402
.doc = "Retry interval used when denied by the Mandos server",
2403
.group = 2 },
2404
{ .name = "network-hook-dir", .key = 133,
2405
.arg = "DIR",
2406
.doc = "Directory where network hooks are located",
2407
.group = 2 },
2408
/*
2409
* These reproduce what we would get without ARGP_NO_HELP
2410
*/
2411
{ .name = "help", .key = '?',
2412
.doc = "Give this help list", .group = -1 },
2413
{ .name = "usage", .key = -3,
2414
.doc = "Give a short usage message", .group = -1 },
2415
{ .name = "version", .key = 'V',
2416
.doc = "Print program version", .group = -1 },
2417
955
{ .name = NULL }
2418
956
};
2419
957
2420
958
error_t parse_opt(int key, char *arg,
2421
959
struct argp_state *state){
2422
errno = 0;
2423
960
switch(key){
2424
961
case 128: /* --debug */
2425
962
debug = true;
2428
965
connect_to = arg;
2429
966
break;
2430
967
case 'i': /* --interface */
2431
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2432
arg, (int)',');
2433
if(ret_errno != 0){
2434
argp_error(state, "%s", strerror(ret_errno));
2435
}
968
interface = arg;
2436
969
break;
2437
970
case 's': /* --seckey */
2438
971
seckey = arg;
2445
978
tmpmax = strtoimax(arg, &tmp, 10);
2446
979
if(errno != 0 or tmp == arg or *tmp != '\0'
2447
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2448
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
2449
983
}
2450
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2451
985
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
2455
986
case 130: /* --priority */
2456
987
mc.priority = arg;
2457
988
break;
2459
990
errno = 0;
2460
991
delay = strtof(arg, &tmp);
2461
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
2462
argp_error(state, "Bad delay");
2463
}
2464
case 132: /* --retry */
2465
errno = 0;
2466
retry_interval = strtod(arg, &tmp);
2467
if(errno != 0 or tmp == arg or *tmp != '\0'
2468
or (retry_interval * 1000) > INT_MAX
2469
or retry_interval < 0){
2470
argp_error(state, "Bad retry interval");
2471
}
2472
break;
2473
case 133: /* --network-hook-dir */
2474
hookdir = arg;
2475
break;
2476
/*
2477
* These reproduce what we would get without ARGP_NO_HELP
2478
*/
2479
case '?': /* --help */
2480
argp_state_help(state, state->out_stream,
2481
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2482
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2483
case -3: /* --usage */
2484
argp_state_help(state, state->out_stream,
2485
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2486
case 'V': /* --version */
2487
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2488
exit(argp_err_exit_status);
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
2489
1000
break;
2490
1001
default:
2491
1002
return ARGP_ERR_UNKNOWN;
2492
1003
}
2493
return errno;
1004
return 0;
2494
1005
}
2495
1006
2496
1007
struct argp argp = { .options = options, .parser = parse_opt,
2497
1008
.args_doc = "",
2498
1009
.doc = "Mandos client -- Get and decrypt"
2499
1010
" passwords from a Mandos server" };
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
2503
case 0:
2504
break;
2505
case ENOMEM:
2506
default:
2507
errno = ret_errno;
2508
perror_plus("argp_parse");
2509
exitcode = EX_OSERR;
2510
goto end;
2511
case EINVAL:
2512
exitcode = EX_USAGE;
2513
goto end;
2514
}
2515
}
2516
2517
{
2518
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
2520
2521
/* Re-raise privileges */
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2525
perror_plus("Failed to raise privileges");
2526
} else {
2527
struct stat st;
2528
2529
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2530
int seckey_fd = open(seckey, O_RDONLY);
2531
if(seckey_fd == -1){
2532
perror_plus("open");
2533
} else {
2534
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2535
if(ret == -1){
2536
perror_plus("fstat");
2537
} else {
2538
if(S_ISREG(st.st_mode)
2539
and st.st_uid == 0 and st.st_gid == 0){
2540
ret = fchown(seckey_fd, uid, gid);
2541
if(ret == -1){
2542
perror_plus("fchown");
2543
}
2544
}
2545
}
2546
close(seckey_fd);
2547
}
2548
}
2549
2550
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2551
int pubkey_fd = open(pubkey, O_RDONLY);
2552
if(pubkey_fd == -1){
2553
perror_plus("open");
2554
} else {
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2556
if(ret == -1){
2557
perror_plus("fstat");
2558
} else {
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(pubkey_fd, uid, gid);
2562
if(ret == -1){
2563
perror_plus("fchown");
2564
}
2565
}
2566
}
2567
close(pubkey_fd);
2568
}
2569
}
2570
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2576
} else {
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2578
if(ret == -1){
2579
perror_plus("fstat");
2580
} else {
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2584
if(ret == -1){
2585
perror_plus("fchown");
2586
}
2587
}
2588
}
2589
close(dhparams_fd);
2590
}
2591
}
2592
2593
/* Lower privileges */
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2597
perror_plus("Failed to lower privileges");
2598
}
2599
}
2600
}
2601
2602
/* Remove invalid interface names (except "none") */
2603
{
2604
char *interface = NULL;
2605
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2606
interface))){
2607
if(strcmp(interface, "none") != 0
2608
and if_nametoindex(interface) == 0){
2609
if(interface[0] != '\0'){
2610
fprintf_plus(stderr, "Not using nonexisting interface"
2611
" \"%s\"\n", interface);
2612
}
2613
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2614
interface = NULL;
2615
}
2616
}
2617
}
2618
2619
/* Run network hooks */
2620
{
2621
if(mc.interfaces != NULL){
2622
interfaces_hooks = malloc(mc.interfaces_size);
2623
if(interfaces_hooks == NULL){
2624
perror_plus("malloc");
2625
goto end;
2626
}
2627
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2628
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2629
}
2630
run_network_hooks("start", interfaces_hooks != NULL ?
2631
interfaces_hooks : "", delay);
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
2632
1017
}
2633
1018
2634
1019
if(not debug){
2639
1024
from the signal handler */
2640
1025
/* Initialize the pseudo-RNG for Avahi */
2641
1026
srand((unsigned int) time(NULL));
2642
simple_poll = avahi_simple_poll_new();
2643
if(simple_poll == NULL){
2644
fprintf_plus(stderr,
2645
"Avahi: Failed to create simple poll object.\n");
2646
exitcode = EX_UNAVAILABLE;
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
2647
1031
goto end;
2648
1032
}
2649
1033
2650
1034
sigemptyset(&sigterm_action.sa_mask);
2651
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2652
1036
if(ret == -1){
2653
perror_plus("sigaddset");
2654
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2655
1039
goto end;
2656
1040
}
2657
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2658
1042
if(ret == -1){
2659
perror_plus("sigaddset");
2660
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2661
1045
goto end;
2662
1046
}
2663
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2664
1048
if(ret == -1){
2665
perror_plus("sigaddset");
2666
exitcode = EX_OSERR;
2667
goto end;
2668
}
2669
/* Need to check if the handler is SIG_IGN before handling:
2670
| [[info:libc:Initial Signal Actions]] |
2671
| [[info:libc:Basic Signal Handling]] |
2672
*/
2673
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2674
if(ret == -1){
2675
perror_plus("sigaction");
2676
return EX_OSERR;
2677
}
2678
if(old_sigterm_action.sa_handler != SIG_IGN){
2679
ret = sigaction(SIGINT, &sigterm_action, NULL);
2680
if(ret == -1){
2681
perror_plus("sigaction");
2682
exitcode = EX_OSERR;
2683
goto end;
2684
}
2685
}
2686
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2687
if(ret == -1){
2688
perror_plus("sigaction");
2689
return EX_OSERR;
2690
}
2691
if(old_sigterm_action.sa_handler != SIG_IGN){
2692
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2693
if(ret == -1){
2694
perror_plus("sigaction");
2695
exitcode = EX_OSERR;
2696
goto end;
2697
}
2698
}
2699
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2700
if(ret == -1){
2701
perror_plus("sigaction");
2702
return EX_OSERR;
2703
}
2704
if(old_sigterm_action.sa_handler != SIG_IGN){
2705
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2706
if(ret == -1){
2707
perror_plus("sigaction");
2708
exitcode = EX_OSERR;
2709
goto end;
2710
}
2711
}
2712
2713
/* If no interfaces were specified, make a list */
2714
if(mc.interfaces == NULL){
2715
struct dirent **direntries = NULL;
2716
/* Look for any good interfaces */
2717
ret = scandir(sys_class_net, &direntries, good_interface,
2718
alphasort);
2719
if(ret >= 1){
2720
/* Add all found interfaces to interfaces list */
2721
for(int i = 0; i < ret; ++i){
2722
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2723
direntries[i]->d_name);
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("argz_add");
2727
free(direntries[i]);
2728
continue;
2729
}
2730
if(debug){
2731
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2732
direntries[i]->d_name);
2733
}
2734
free(direntries[i]);
2735
}
2736
free(direntries);
2737
} else {
2738
if(ret == 0){
2739
free(direntries);
2740
}
2741
fprintf_plus(stderr, "Could not find a network interface\n");
2742
exitcode = EXIT_FAILURE;
2743
goto end;
2744
}
2745
}
2746
2747
/* Bring up interfaces which are down, and remove any "none"s */
2748
{
2749
char *interface = NULL;
2750
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2751
interface))){
2752
/* If interface name is "none", stop bringing up interfaces.
2753
Also remove all instances of "none" from the list */
2754
if(strcmp(interface, "none") == 0){
2755
argz_delete(&mc.interfaces, &mc.interfaces_size,
2756
interface);
2757
interface = NULL;
2758
while((interface = argz_next(mc.interfaces,
2759
mc.interfaces_size, interface))){
2760
if(strcmp(interface, "none") == 0){
2761
argz_delete(&mc.interfaces, &mc.interfaces_size,
2762
interface);
2763
interface = NULL;
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
2764
1113
}
2765
1114
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
2766
1125
break;
2767
1126
}
2768
bool interface_was_up = interface_is_up(interface);
2769
errno = bring_up_interface(interface, delay);
2770
if(not interface_was_up){
2771
if(errno != 0){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2774
} else {
2775
errno = argz_add(&interfaces_to_take_down,
2776
&interfaces_to_take_down_size,
2777
interface);
2778
if(errno != 0){
2779
perror_plus("argz_add");
2780
}
2781
}
2782
}
2783
}
2784
if(debug and (interfaces_to_take_down == NULL)){
2785
fprintf_plus(stderr, "No interfaces were brought up\n");
2786
}
2787
}
2788
2789
/* If we only got one interface, explicitly use only that one */
2790
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2791
if(debug){
2792
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2793
mc.interfaces);
2794
}
2795
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2796
}
2797
2798
if(quit_now){
2799
goto end;
2800
}
2801
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2803
if(ret == -1){
2804
fprintf_plus(stderr, "init_gnutls_global failed\n");
2805
exitcode = EX_UNAVAILABLE;
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2806
1166
goto end;
2807
1167
} else {
2808
1168
gnutls_initialized = true;
2809
1169
}
2810
1170
2811
if(quit_now){
2812
goto end;
2813
}
2814
2815
/* Try /run/tmp before /tmp */
2816
tempdir = mkdtemp(run_tempdir);
2817
if(tempdir == NULL and errno == ENOENT){
2818
if(debug){
2819
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2820
run_tempdir, old_tempdir);
2821
}
2822
tempdir = mkdtemp(old_tempdir);
2823
}
2824
if(tempdir == NULL){
2825
perror_plus("mkdtemp");
2826
goto end;
2827
}
2828
2829
if(quit_now){
2830
goto end;
2831
}
2832
2833
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2834
fprintf_plus(stderr, "init_gpgme failed\n");
2835
exitcode = EX_UNAVAILABLE;
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2836
1180
goto end;
2837
1181
} else {
2838
1182
gpgme_initialized = true;
2839
1183
}
2840
1184
2841
if(quit_now){
2842
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2843
1192
}
2844
1193
2845
1194
if(connect_to != NULL){
2846
1195
/* Connect directly, do not use Zeroconf */
2847
1196
/* (Mainly meant for debugging) */
2848
1197
char *address = strrchr(connect_to, ':');
2849
2850
1198
if(address == NULL){
2851
fprintf_plus(stderr, "No colon in address\n");
2852
exitcode = EX_USAGE;
2853
goto end;
2854
}
2855
2856
if(quit_now){
2857
goto end;
2858
}
2859
2860
in_port_t port;
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
2861
1204
errno = 0;
2862
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2863
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2864
or tmpmax != (in_port_t)tmpmax){
2865
fprintf_plus(stderr, "Bad port number\n");
2866
exitcode = EX_USAGE;
2867
goto end;
2868
}
2869
2870
if(quit_now){
2871
goto end;
2872
}
2873
2874
port = (in_port_t)tmpmax;
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
2875
1213
*address = '\0';
1214
address = connect_to;
2876
1215
/* Colon in address indicates IPv6 */
2877
1216
int af;
2878
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2879
1218
af = AF_INET6;
2880
/* Accept [] around IPv6 address - see RFC 5952 */
2881
if(connect_to[0] == '[' and address[-1] == ']')
2882
{
2883
connect_to++;
2884
address[-1] = '\0';
2885
}
2886
1219
} else {
2887
1220
af = AF_INET;
2888
1221
}
2889
address = connect_to;
2890
2891
if(quit_now){
2892
goto end;
2893
}
2894
2895
while(not quit_now){
2896
ret = start_mandos_communication(address, port, if_index, af,
2897
&mc);
2898
if(quit_now or ret == 0){
2899
break;
2900
}
2901
if(debug){
2902
fprintf_plus(stderr, "Retrying in %d seconds\n",
2903
(int)retry_interval);
2904
}
2905
sleep((unsigned int)retry_interval);
2906
}
2907
2908
if(not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2909
1226
exitcode = EXIT_SUCCESS;
2910
1227
}
1228
goto end;
1229
}
2911
1230
2912
goto end;
2913
}
2914
2915
if(quit_now){
2916
goto end;
2917
}
2918
2919
1231
{
2920
1232
AvahiServerConfig config;
2921
1233
/* Do not publish any local Zeroconf records */
2926
1238
config.publish_domain = 0;
2927
1239
2928
1240
/* Allocate a new server */
2929
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
2931
1244
2932
1245
/* Free the Avahi configuration data */
2933
1246
avahi_server_config_free(&config);
2935
1248
2936
1249
/* Check if creating the Avahi server object succeeded */
2937
1250
if(mc.server == NULL){
2938
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
2940
exitcode = EX_UNAVAILABLE;
2941
goto end;
2942
}
2943
2944
if(quit_now){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2945
1254
goto end;
2946
1255
}
2947
1256
2948
1257
/* Create the Avahi service browser */
2949
1258
sb = avahi_s_service_browser_new(mc.server, if_index,
2950
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2951
NULL, 0, browse_callback,
2952
(void *)&mc);
1260
NULL, 0, browse_callback, NULL);
2953
1261
if(sb == NULL){
2954
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2955
avahi_strerror(avahi_server_errno(mc.server)));
2956
exitcode = EX_UNAVAILABLE;
2957
goto end;
2958
}
2959
2960
if(quit_now){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2961
1265
goto end;
2962
1266
}
2963
1267
2964
1268
/* Run the main loop */
2965
1269
2966
1270
if(debug){
2967
fprintf_plus(stderr, "Starting Avahi loop search\n");
1271
fprintf(stderr, "Starting Avahi loop search\n");
2968
1272
}
2969
1273
2970
ret = avahi_loop_with_timeout(simple_poll,
2971
(int)(retry_interval * 1000), &mc);
2972
if(debug){
2973
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2974
(ret == 0) ? "successfully" : "with error");
2975
}
1274
avahi_simple_poll_loop(mc.simple_poll);
2976
1275
2977
1276
end:
2978
1277
2979
1278
if(debug){
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2987
1280
}
2988
1281
2989
1282
/* Cleanup things */
2990
free(mc.interfaces);
2991
2992
1283
if(sb != NULL)
2993
1284
avahi_s_service_browser_free(sb);
2994
1285
2995
1286
if(mc.server != NULL)
2996
1287
avahi_server_free(mc.server);
2997
1288
2998
if(simple_poll != NULL)
2999
avahi_simple_poll_free(simple_poll);
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
3000
1291
3001
1292
if(gnutls_initialized){
3002
1293
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
3003
1295
gnutls_dh_params_deinit(mc.dh_params);
3004
1296
}
3005
1297
3007
1299
gpgme_release(mc.ctx);
3008
1300
}
3009
1301
3010
/* Cleans up the circular linked list of Mandos servers the client
3011
has seen */
3012
if(mc.current_server != NULL){
3013
mc.current_server->prev->next = NULL;
3014
while(mc.current_server != NULL){
3015
server *next = mc.current_server->next;
3016
#ifdef __GNUC__
3017
#pragma GCC diagnostic push
3018
#pragma GCC diagnostic ignored "-Wcast-qual"
3019
#endif
3020
free((char *)(mc.current_server->ip));
3021
#ifdef __GNUC__
3022
#pragma GCC diagnostic pop
3023
#endif
3024
free(mc.current_server);
3025
mc.current_server = next;
3026
}
3027
}
3028
3029
/* Re-raise privileges */
3030
{
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to raise privileges");
3035
} else {
3036
3037
/* Run network hooks */
3038
run_network_hooks("stop", interfaces_hooks != NULL ?
3039
interfaces_hooks : "", delay);
3040
3041
/* Take down the network interfaces which were brought up */
3042
{
3043
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to take down interface");
3051
}
3052
}
3053
if(debug and (interfaces_to_take_down == NULL)){
3054
fprintf_plus(stderr, "No interfaces needed to be taken"
3055
" down\n");
3056
}
3057
}
3058
}
3059
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
3063
perror_plus("Failed to lower privileges permanently");
3064
}
3065
}
3066
3067
free(interfaces_to_take_down);
3068
free(interfaces_hooks);
3069
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
3072
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
3086
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
3124
/* Removes the GPGME temp directory and all files inside */
3125
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
3127
}
3128
3129
if(quit_now){
3130
sigemptyset(&old_sigterm_action.sa_mask);
3131
old_sigterm_action.sa_handler = SIG_DFL;
3132
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3133
&old_sigterm_action,
3134
NULL));
3135
if(ret == -1){
3136
perror_plus("sigaction");
3137
}
3138
do {
3139
ret = raise(signal_received);
3140
} while(ret != 0 and errno == EINTR);
3141
if(ret != 0){
3142
perror_plus("raise");
3143
abort();
3144
}
3145
TEMP_FAILURE_RETRY(pause());
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
3146
1344
}
3147
1345
3148
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0