To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 487
- compare with another revision
- download diff
- download tarball
- view history from revision 487
- Committer: Teddy Hogeborn
- Date: 2011-07-16 00:29:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20110716002919-r77yikuiulj42o40
* initramfs-tools-script: Abort if plugin-runner is missing. Removed
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
- files removed:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
31
30
*/
32
31
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
56
54
SOCK_STREAM, uid_t, gid_t, open(),
57
55
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
87
80
argp_state, struct argp,
92
85
raise() */
93
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
88
105
89
#ifdef __linux__
106
90
#include <sys/klog.h> /* klogctl() */
124
108
init_gnutls_session(),
125
109
GNUTLS_* */
126
110
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
129
113
130
114
/* GPGME */
131
115
#include <gpgme.h> /* All GPGME types, constants and
139
123
#define PATHDIR "/conf/conf.d/mandos"
140
124
#define SECKEY "seckey.txt"
141
125
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
126
144
127
bool debug = false;
145
128
static const char mandos_protocol_version[] = "1";
146
129
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
131
static const char sys_class_net[] = "/sys/class/net";
149
132
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
133
155
134
/* Doubly linked list that need to be circularly linked when used */
156
135
typedef struct server{
157
136
const char *ip;
158
in_port_t port;
137
uint16_t port;
159
138
AvahiIfIndex if_index;
160
139
int af;
161
140
struct timespec last_seen;
165
144
166
145
/* Used for passing in values through the Avahi callback functions */
167
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
168
148
AvahiServer *server;
169
149
gnutls_certificate_credentials_t cred;
170
150
unsigned int dh_bits;
172
152
const char *priority;
173
153
gpgme_ctx_t ctx;
174
154
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
155
} mandos_context;
178
156
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
181
162
182
163
sig_atomic_t quit_now = 0;
183
164
int signal_received = 0;
184
165
185
166
/* Function to use when printing errors */
186
167
void perror_plus(const char *print_text){
187
int e = errno;
188
168
fprintf(stderr, "Mandos plugin %s: ",
189
169
program_invocation_short_name);
190
errno = e;
191
170
perror(print_text);
192
171
}
193
172
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
204
173
/*
205
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
175
* bytes. "buffer_capacity" is how much is currently allocated,
207
176
* "buffer_length" is how much is already used.
208
177
*/
209
__attribute__((nonnull, warn_unused_result))
210
178
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
179
size_t buffer_capacity){
212
180
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;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
219
183
return 0;
220
184
}
221
*buffer = new_buf;
222
185
buffer_capacity += BUFFER_SIZE;
223
186
}
224
187
return buffer_capacity;
225
188
}
226
189
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){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
231
193
int ret;
232
194
server *new_server = malloc(sizeof(server));
233
195
if(new_server == NULL){
234
196
perror_plus("malloc");
235
return false;
197
return -1;
236
198
}
237
199
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
200
.port = port,
201
.if_index = if_index,
202
.af = af };
241
203
if(new_server->ip == NULL){
242
204
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){
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
262
209
new_server->next = new_server;
263
210
new_server->prev = new_server;
264
*current_server = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
265
213
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
269
216
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
273
225
}
274
226
275
227
/*
276
228
* Initialize GPGME.
277
229
*/
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){
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
283
232
gpgme_error_t rc;
284
233
gpgme_engine_info_t engine_info;
285
234
235
286
236
/*
287
237
* Helper function to insert pub and seckey to the engine keyring.
288
238
*/
289
bool import_key(const char * const filename){
239
bool import_key(const char *filename){
290
240
int ret;
291
241
int fd;
292
242
gpgme_data_t pgp_data;
299
249
300
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
251
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));
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
304
254
return false;
305
255
}
306
256
307
rc = gpgme_op_import(mc->ctx, pgp_data);
257
rc = gpgme_op_import(mc.ctx, pgp_data);
308
258
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
311
261
return false;
312
262
}
313
263
314
ret = close(fd);
264
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
265
if(ret == -1){
316
266
perror_plus("close");
317
267
}
320
270
}
321
271
322
272
if(debug){
323
fprintf_plus(stderr, "Initializing GPGME\n");
273
fprintf(stderr, "Initializing GPGME\n");
324
274
}
325
275
326
276
/* Init GPGME */
327
277
gpgme_check_version(NULL);
328
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
329
279
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));
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
332
282
return false;
333
283
}
334
284
335
/* Set GPGME home directory for the OpenPGP engine only */
285
/* Set GPGME home directory for the OpenPGP engine only */
336
286
rc = gpgme_get_engine_info(&engine_info);
337
287
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));
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
340
290
return false;
341
291
}
342
292
while(engine_info != NULL){
348
298
engine_info = engine_info->next;
349
299
}
350
300
if(engine_info == NULL){
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
353
302
return false;
354
303
}
355
304
356
305
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
306
rc = gpgme_new(&(mc.ctx));
358
307
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));
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
362
310
return false;
363
311
}
364
312
373
321
* Decrypt OpenPGP data.
374
322
* Returns -1 on error
375
323
*/
376
__attribute__((nonnull, warn_unused_result))
377
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
325
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
326
char **plaintext){
381
327
gpgme_data_t dh_crypto, dh_plain;
382
328
gpgme_error_t rc;
383
329
ssize_t ret;
385
331
ssize_t plaintext_length = 0;
386
332
387
333
if(debug){
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
389
335
}
390
336
391
337
/* Create new GPGME data buffer from memory cryptotext */
392
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
393
339
0);
394
340
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));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
397
343
return -1;
398
344
}
399
345
400
346
/* Create new empty GPGME data buffer for the plaintext */
401
347
rc = gpgme_data_new(&dh_plain);
402
348
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));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
406
351
gpgme_data_release(dh_crypto);
407
352
return -1;
408
353
}
409
354
410
355
/* Decrypt data from the cryptotext data buffer to the plaintext
411
356
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
358
if(rc != GPG_ERR_NO_ERROR){
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
416
361
plaintext_length = -1;
417
362
if(debug){
418
363
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
364
result = gpgme_op_decrypt_result(mc.ctx);
420
365
if(result == NULL){
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
422
367
} else {
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
427
372
if(result->file_name != NULL){
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
429
374
}
430
375
gpgme_recipient_t recipient;
431
376
recipient = result->recipients;
432
377
while(recipient != NULL){
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
440
384
recipient = recipient->next;
441
385
}
442
386
}
445
389
}
446
390
447
391
if(debug){
448
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
449
393
}
450
394
451
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
458
402
*plaintext = NULL;
459
403
while(true){
460
404
plaintext_capacity = incbuffer(plaintext,
461
(size_t)plaintext_length,
462
plaintext_capacity);
405
(size_t)plaintext_length,
406
plaintext_capacity);
463
407
if(plaintext_capacity == 0){
464
perror_plus("incbuffer");
465
plaintext_length = -1;
466
goto decrypt_end;
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
467
411
}
468
412
469
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
482
426
}
483
427
484
428
if(debug){
485
fprintf_plus(stderr, "Decrypted password is: ");
429
fprintf(stderr, "Decrypted password is: ");
486
430
for(ssize_t i = 0; i < plaintext_length; i++){
487
431
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
488
432
}
499
443
return plaintext_length;
500
444
}
501
445
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
446
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
449
if(ret == NULL)
450
ret = "(unknown)";
451
return ret;
513
452
}
514
453
515
454
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
455
static void debuggnutls(__attribute__((unused)) int level,
518
456
const char* string){
519
fprintf_plus(stderr, "GnuTLS: %s", string);
457
fprintf(stderr, "GnuTLS: %s", string);
520
458
}
521
459
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
460
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
461
const char *seckeyfilename){
527
462
int ret;
528
unsigned int uret;
529
463
530
464
if(debug){
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
465
fprintf(stderr, "Initializing GnuTLS\n");
466
}
467
468
ret = gnutls_global_init();
469
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
472
return -1;
532
473
}
533
474
534
475
if(debug){
540
481
}
541
482
542
483
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
485
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
547
489
return -1;
548
490
}
549
491
550
492
if(debug){
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
555
496
}
556
497
557
498
ret = gnutls_certificate_set_openpgp_key_file
558
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
559
500
GNUTLS_OPENPGP_FMT_BASE64);
560
501
if(ret != GNUTLS_E_SUCCESS){
561
fprintf_plus(stderr,
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
566
507
goto globalfail;
567
508
}
568
509
569
510
/* GnuTLS server initialization */
570
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
575
goto globalfail;
576
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
if(params.data == NULL){
617
dhparamsfilename = NULL;
618
}
619
if(dhparamsfilename == NULL){
620
break;
621
}
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
629
}
630
free(params.data);
631
} while(false);
632
}
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
do {
639
int secfile = open(seckeyfilename, O_RDONLY);
640
if(secfile == -1){
641
perror_plus("open");
642
break;
643
}
644
size_t buffer_capacity = 0;
645
while(true){
646
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer.size,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
651
free(buffer.data);
652
buffer.data = NULL;
653
break;
654
}
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
657
BUFFER_SIZE);
658
/* EOF */
659
if(bytes_read == 0){
660
break;
661
}
662
/* check bytes_read for failure */
663
if(bytes_read < 0){
664
perror_plus("read");
665
free(buffer.data);
666
buffer.data = NULL;
667
break;
668
}
669
buffer.size += (unsigned int)bytes_read;
670
}
671
close(secfile);
672
} while(false);
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
676
{
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
" structure: %s",
682
safer_gnutls_strerror(ret));
683
free(buffer.data);
684
buffer.data = NULL;
685
} else {
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
691
privkey = NULL;
692
}
693
free(buffer.data);
694
buffer.data = NULL;
695
if(privkey != NULL){
696
/* Use private key to suggest an appropriate
697
sec_param */
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
700
if(debug){
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
704
(sec_param)));
705
}
706
}
707
}
708
}
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
if(debug){
713
fprintf_plus(stderr, "Falling back to security parameter"
714
" \"%s\"\n",
715
safe_string(gnutls_sec_param_get_name
716
(sec_param)));
717
}
718
}
719
}
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
if(uret != 0){
722
mc->dh_bits = uret;
723
if(debug){
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
mc->dh_bits);
729
}
730
} else {
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
734
(sec_param)),
735
safer_gnutls_strerror(ret));
736
goto globalfail;
737
}
738
} else if(debug){
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
mc->dh_bits);
741
}
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
747
goto globalfail;
748
}
749
}
750
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
515
goto globalfail;
516
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
521
goto globalfail;
522
}
523
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
751
525
752
526
return 0;
753
527
754
528
globalfail:
755
529
756
gnutls_certificate_free_credentials(mc->cred);
757
gnutls_dh_params_deinit(mc->dh_params);
530
gnutls_certificate_free_credentials(mc.cred);
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
758
533
return -1;
759
534
}
760
535
761
__attribute__((nonnull, warn_unused_result))
762
static int init_gnutls_session(gnutls_session_t *session,
763
mandos_context *mc){
536
static int init_gnutls_session(gnutls_session_t *session){
764
537
int ret;
765
538
/* GnuTLS session creation */
766
539
do {
770
543
}
771
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
772
545
if(ret != GNUTLS_E_SUCCESS){
773
fprintf_plus(stderr,
774
"Error in GnuTLS session initialization: %s\n",
775
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
776
548
}
777
549
778
550
{
779
551
const char *err;
780
552
do {
781
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
782
554
if(quit_now){
783
555
gnutls_deinit(*session);
784
556
return -1;
785
557
}
786
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
787
559
if(ret != GNUTLS_E_SUCCESS){
788
fprintf_plus(stderr, "Syntax error at: %s\n", err);
789
fprintf_plus(stderr, "GnuTLS error: %s\n",
790
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
791
563
gnutls_deinit(*session);
792
564
return -1;
793
565
}
795
567
796
568
do {
797
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
798
mc->cred);
570
mc.cred);
799
571
if(quit_now){
800
572
gnutls_deinit(*session);
801
573
return -1;
802
574
}
803
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
804
576
if(ret != GNUTLS_E_SUCCESS){
805
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
806
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
807
579
gnutls_deinit(*session);
808
580
return -1;
809
581
}
811
583
/* ignore client certificate if any. */
812
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
813
585
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
587
814
588
return 0;
815
589
}
816
590
818
592
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
819
593
__attribute__((unused)) const char *txt){}
820
594
821
/* Set effective uid to 0, return errno */
822
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
826
if(seteuid(0) == -1){
827
ret = errno;
828
}
829
errno = old_errno;
830
return ret;
831
}
832
833
/* Set effective and real user ID to 0. Return errno. */
834
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
839
errno = old_errno;
840
return ret;
841
}
842
if(setuid(0) == -1){
843
ret = errno;
844
}
845
errno = old_errno;
846
return ret;
847
}
848
849
/* Set effective user ID to unprivileged saved user ID */
850
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
854
if(seteuid(uid) == -1){
855
ret = errno;
856
}
857
errno = old_errno;
858
return ret;
859
}
860
861
/* Lower privileges permanently */
862
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
866
if(setuid(uid) == -1){
867
ret = errno;
868
}
869
errno = old_errno;
870
return ret;
871
}
872
873
/* Helper function to add_local_route() and delete_local_route() */
874
__attribute__((nonnull, warn_unused_result))
875
static bool add_delete_local_route(const bool add,
876
const char *address,
877
AvahiIfIndex if_index){
878
int ret;
879
char helper[] = "mandos-client-iprouteadddel";
880
char add_arg[] = "add";
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
884
if(pluginhelperdir == NULL){
885
if(debug){
886
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
887
" variable not set; cannot run helper\n");
888
}
889
return false;
890
}
891
892
char interface[IF_NAMESIZE];
893
if(if_indextoname((unsigned int)if_index, interface) == NULL){
894
perror_plus("if_indextoname");
895
return false;
896
}
897
898
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
if(devnull == -1){
900
perror_plus("open(\"/dev/null\", O_RDONLY)");
901
return false;
902
}
903
pid_t pid = fork();
904
if(pid == 0){
905
/* Child */
906
/* Raise privileges */
907
errno = raise_privileges_permanently();
908
if(errno != 0){
909
perror_plus("Failed to raise privileges");
910
/* _exit(EX_NOPERM); */
911
} else {
912
/* Set group */
913
errno = 0;
914
ret = setgid(0);
915
if(ret == -1){
916
perror_plus("setgid");
917
_exit(EX_NOPERM);
918
}
919
/* Reset supplementary groups */
920
errno = 0;
921
ret = setgroups(0, NULL);
922
if(ret == -1){
923
perror_plus("setgroups");
924
_exit(EX_NOPERM);
925
}
926
}
927
ret = dup2(devnull, STDIN_FILENO);
928
if(ret == -1){
929
perror_plus("dup2(devnull, STDIN_FILENO)");
930
_exit(EX_OSERR);
931
}
932
ret = close(devnull);
933
if(ret == -1){
934
perror_plus("close");
935
_exit(EX_OSERR);
936
}
937
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
if(ret == -1){
939
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
_exit(EX_OSERR);
941
}
942
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
943
O_RDONLY
944
| O_DIRECTORY
945
| O_PATH
946
| O_CLOEXEC));
947
if(helperdir_fd == -1){
948
perror_plus("open");
949
_exit(EX_UNAVAILABLE);
950
}
951
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
helper, O_RDONLY));
953
if(helper_fd == -1){
954
perror_plus("openat");
955
close(helperdir_fd);
956
_exit(EX_UNAVAILABLE);
957
}
958
close(helperdir_fd);
959
#ifdef __GNUC__
960
#pragma GCC diagnostic push
961
#pragma GCC diagnostic ignored "-Wcast-qual"
962
#endif
963
if(fexecve(helper_fd, (char *const [])
964
{ helper, add ? add_arg : delete_arg, (char *)address,
965
interface, debug ? debug_flag : NULL, NULL },
966
environ) == -1){
967
#ifdef __GNUC__
968
#pragma GCC diagnostic pop
969
#endif
970
perror_plus("fexecve");
971
_exit(EXIT_FAILURE);
972
}
973
}
974
if(pid == -1){
975
perror_plus("fork");
976
return false;
977
}
978
int status;
979
pid_t pret = -1;
980
errno = 0;
981
do {
982
pret = waitpid(pid, &status, 0);
983
if(pret == -1 and errno == EINTR and quit_now){
984
int errno_raising = 0;
985
if((errno = raise_privileges()) != 0){
986
errno_raising = errno;
987
perror_plus("Failed to raise privileges in order to"
988
" kill helper program");
989
}
990
if(kill(pid, SIGTERM) == -1){
991
perror_plus("kill");
992
}
993
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
994
perror_plus("Failed to lower privileges after killing"
995
" helper program");
996
}
997
return false;
998
}
999
} while(pret == -1 and errno == EINTR);
1000
if(pret == -1){
1001
perror_plus("waitpid");
1002
return false;
1003
}
1004
if(WIFEXITED(status)){
1005
if(WEXITSTATUS(status) != 0){
1006
fprintf_plus(stderr, "Error: iprouteadddel exited"
1007
" with status %d\n", WEXITSTATUS(status));
1008
return false;
1009
}
1010
return true;
1011
}
1012
if(WIFSIGNALED(status)){
1013
fprintf_plus(stderr, "Error: iprouteadddel died by"
1014
" signal %d\n", WTERMSIG(status));
1015
return false;
1016
}
1017
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
return false;
1019
}
1020
1021
__attribute__((nonnull, warn_unused_result))
1022
static bool add_local_route(const char *address,
1023
AvahiIfIndex if_index){
1024
if(debug){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
}
1027
return add_delete_local_route(true, address, if_index);
1028
}
1029
1030
__attribute__((nonnull, warn_unused_result))
1031
static bool delete_local_route(const char *address,
1032
AvahiIfIndex if_index){
1033
if(debug){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
}
1036
return add_delete_local_route(false, address, if_index);
1037
}
1038
1039
595
/* Called when a Mandos server is found */
1040
__attribute__((nonnull, warn_unused_result))
1041
static int start_mandos_communication(const char *ip, in_port_t port,
596
static int start_mandos_communication(const char *ip, uint16_t port,
1042
597
AvahiIfIndex if_index,
1043
int af, mandos_context *mc){
598
int af){
1044
599
int ret, tcp_sd = -1;
1045
600
ssize_t sret;
1046
struct sockaddr_storage to;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
1047
605
char *buffer = NULL;
1048
606
char *decrypted_buffer = NULL;
1049
607
size_t buffer_length = 0;
1052
610
int retval = -1;
1053
611
gnutls_session_t session;
1054
612
int pf; /* Protocol family */
1055
bool route_added = false;
1056
613
1057
614
errno = 0;
1058
615
1069
626
pf = PF_INET;
1070
627
break;
1071
628
default:
1072
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
1073
630
errno = EINVAL;
1074
631
return -1;
1075
632
}
1076
633
1077
/* If the interface is specified and we have a list of interfaces */
1078
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1079
/* Check if the interface is one of the interfaces we are using */
1080
bool match = false;
1081
{
1082
char *interface = NULL;
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
634
ret = init_gnutls_session(&session);
1111
635
if(ret != 0){
1112
636
return -1;
1113
637
}
1114
638
1115
639
if(debug){
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
1118
642
}
1119
643
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
645
if(tcp_sd < 0){
1122
646
int e = errno;
1123
647
perror_plus("socket");
1130
654
goto mandos_end;
1131
655
}
1132
656
657
memset(&to, 0, sizeof(to));
1133
658
if(af == AF_INET6){
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1137
661
} else { /* IPv4 */
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
1141
664
}
1142
665
if(ret < 0 ){
1143
666
int e = errno;
1147
670
}
1148
671
if(ret == 0){
1149
672
int e = errno;
1150
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
1151
674
errno = e;
1152
675
goto mandos_end;
1153
676
}
1154
677
if(af == AF_INET6){
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
1158
685
if(if_index == AVAHI_IF_UNSPEC){
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
1161
688
errno = EINVAL;
1162
689
goto mandos_end;
1163
690
}
1164
691
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
692
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
693
}
1167
694
} else {
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
1169
698
}
1170
699
1171
700
if(quit_now){
1179
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1180
709
perror_plus("if_indextoname");
1181
710
} else {
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
1184
713
}
1185
714
} else {
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
1188
717
}
1189
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
734
}
735
}
736
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
747
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
1271
759
}
1272
760
1273
761
const char *out = mandos_protocol_version;
1275
763
while(true){
1276
764
size_t out_size = strlen(out);
1277
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1278
out_size - written));
766
out_size - written));
1279
767
if(ret == -1){
1280
768
int e = errno;
1281
769
perror_plus("write");
1301
789
}
1302
790
1303
791
if(debug){
1304
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1305
793
}
1306
794
1307
795
if(quit_now){
1309
797
goto mandos_end;
1310
798
}
1311
799
1312
/* This casting via intptr_t is to eliminate warning about casting
1313
an int to a pointer type. This is exactly how the GnuTLS Guile
1314
function "set-session-transport-fd!" does it. */
1315
gnutls_transport_set_ptr(session,
1316
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1317
802
1318
803
if(quit_now){
1319
804
errno = EINTR;
1330
815
1331
816
if(ret != GNUTLS_E_SUCCESS){
1332
817
if(debug){
1333
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1334
819
gnutls_perror(ret);
1335
820
}
1336
821
errno = EPROTO;
1340
825
/* Read OpenPGP packet that contains the wanted password */
1341
826
1342
827
if(debug){
1343
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1344
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
1345
830
}
1346
831
1347
832
while(true){
1352
837
}
1353
838
1354
839
buffer_capacity = incbuffer(&buffer, buffer_length,
1355
buffer_capacity);
840
buffer_capacity);
1356
841
if(buffer_capacity == 0){
1357
842
int e = errno;
1358
843
perror_plus("incbuffer");
1385
870
}
1386
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1387
872
if(ret < 0){
1388
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1389
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1390
874
gnutls_perror(ret);
1391
875
errno = EPROTO;
1392
876
goto mandos_end;
1393
877
}
1394
878
break;
1395
879
default:
1396
fprintf_plus(stderr, "Unknown error while reading data from"
1397
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
1398
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1399
883
errno = EIO;
1400
884
goto mandos_end;
1405
889
}
1406
890
1407
891
if(debug){
1408
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
1409
893
}
1410
894
1411
895
if(quit_now){
1423
907
1424
908
if(buffer_length > 0){
1425
909
ssize_t decrypted_buffer_size;
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
1428
913
if(decrypted_buffer_size >= 0){
1429
914
1430
clearerr(stdout);
1431
915
written = 0;
1432
916
while(written < (size_t) decrypted_buffer_size){
1433
917
if(quit_now){
1441
925
if(ret == 0 and ferror(stdout)){
1442
926
int e = errno;
1443
927
if(debug){
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1446
930
}
1447
931
errno = e;
1448
932
goto mandos_end;
1449
933
}
1450
934
written += (size_t)ret;
1451
935
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
1462
936
retval = 0;
1463
937
}
1464
938
}
1467
941
1468
942
mandos_end:
1469
943
{
1470
if(route_added){
1471
if(not delete_local_route(ip, if_index)){
1472
fprintf_plus(stderr, "Failed to delete local route to %s on"
1473
" interface %d", ip, if_index);
1474
}
1475
}
1476
944
int e = errno;
1477
945
free(decrypted_buffer);
1478
946
free(buffer);
1479
947
if(tcp_sd >= 0){
1480
ret = close(tcp_sd);
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
949
}
1482
950
if(ret == -1){
1483
951
if(e == 0){
1508
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
1509
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1510
978
flags,
1511
void *mc){
1512
if(r == NULL){
1513
return;
1514
}
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1515
981
1516
982
/* Called whenever a service has been resolved successfully or
1517
983
timed out */
1518
984
1519
985
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1521
986
return;
1522
987
}
1523
988
1524
989
switch(event){
1525
990
default:
1526
991
case AVAHI_RESOLVER_FAILURE:
1527
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1528
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1529
domain,
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1532
995
break;
1533
996
1534
997
case AVAHI_RESOLVER_FOUND:
1536
999
char ip[AVAHI_ADDRESS_STR_MAX];
1537
1000
avahi_address_snprint(ip, sizeof(ip), address);
1538
1001
if(debug){
1539
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1540
PRIdMAX ") on port %" PRIu16 "\n", name,
1541
host_name, ip, (intmax_t)interface, port);
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1542
1005
}
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1547
1008
if(ret == 0){
1548
avahi_simple_poll_quit(simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1549
1010
} else {
1550
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1553
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1554
" list\n", name);
1555
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1556
1013
}
1557
1014
}
1558
1015
}
1568
1025
const char *domain,
1569
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1570
1027
flags,
1571
void *mc){
1572
if(b == NULL){
1573
return;
1574
}
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1575
1030
1576
1031
/* Called whenever a new services becomes available on the LAN or
1577
1032
is removed from the LAN */
1584
1039
default:
1585
1040
case AVAHI_BROWSER_FAILURE:
1586
1041
1587
fprintf_plus(stderr, "(Avahi browser) %s\n",
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1590
avahi_simple_poll_quit(simple_poll);
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1591
1045
return;
1592
1046
1593
1047
case AVAHI_BROWSER_NEW:
1596
1050
the callback function is called the Avahi server will free the
1597
1051
resolver for us. */
1598
1052
1599
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1600
interface, protocol, name, type,
1601
domain, protocol, 0,
1602
resolve_callback, mc) == NULL)
1603
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1604
" %s\n", name,
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1607
1058
break;
1608
1059
1609
1060
case AVAHI_BROWSER_REMOVE:
1612
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1613
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1614
1065
if(debug){
1615
fprintf_plus(stderr, "No Mandos server found, still"
1616
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1617
1067
}
1618
1068
break;
1619
1069
}
1628
1078
signal_received = sig;
1629
1079
int old_errno = errno;
1630
1080
/* set main loop to exit */
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1633
1083
}
1634
1084
errno = old_errno;
1635
1085
}
1636
1086
1637
__attribute__((nonnull, warn_unused_result))
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
int ret;
1640
int old_errno;
1641
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(s < 0){
1644
old_errno = errno;
1645
perror_plus("socket");
1646
errno = old_errno;
1647
return false;
1648
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
if(ret == -1){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1653
1143
if(debug){
1654
old_errno = errno;
1655
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1657
1146
}
1658
return false;
1147
free(flagstring);
1148
return 0;
1659
1149
}
1660
return true;
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1665
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1666
1152
/* Reject the loopback device */
1667
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1668
1154
if(debug){
1669
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1670
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1671
1157
}
1672
return false;
1158
return 0;
1673
1159
}
1674
1160
/* Accept point-to-point devices only if connect_to is specified */
1675
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1676
1162
if(debug){
1677
fprintf_plus(stderr, "Accepting point-to-point interface"
1678
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1679
1165
}
1680
return true;
1166
return 1;
1681
1167
}
1682
1168
/* Otherwise, reject non-broadcast-capable devices */
1683
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1684
1170
if(debug){
1685
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1686
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1687
1173
}
1688
return false;
1174
return 0;
1689
1175
}
1690
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1691
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1692
1178
if(debug){
1693
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1694
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1695
1181
}
1696
return false;
1182
return 0;
1697
1183
}
1698
1699
1184
/* Accept this device */
1700
1185
if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1702
}
1703
return true;
1704
}
1705
1706
/*
1707
* This function determines if a directory entry in /sys/class/net
1708
* corresponds to an acceptable network device.
1709
* (This function is passed to scandir(3) as a filter function.)
1710
*/
1711
__attribute__((nonnull, warn_unused_result))
1712
int good_interface(const struct dirent *if_entry){
1713
if(if_entry->d_name[0] == '.'){
1714
return 0;
1715
}
1716
1717
struct ifreq ifr;
1718
if(not get_flags(if_entry->d_name, &ifr)){
1719
if(debug){
1720
fprintf_plus(stderr, "Failed to get flags for interface "
1721
"\"%s\"\n", if_entry->d_name);
1722
}
1723
return 0;
1724
}
1725
1726
if(not good_flags(if_entry->d_name, &ifr)){
1727
return 0;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1728
1188
}
1729
1189
return 1;
1730
1190
}
1731
1191
1732
/*
1733
* This function determines if a network interface is up.
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1737
struct ifreq ifr;
1738
if(not get_flags(interface, &ifr)){
1739
if(debug){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
}
1743
return false;
1744
}
1745
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1747
}
1748
1749
/*
1750
* This function determines if a network interface is running
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1754
struct ifreq ifr;
1755
if(not get_flags(interface, &ifr)){
1756
if(debug){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1759
}
1760
return false;
1761
}
1762
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
}
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1767
1192
int notdotentries(const struct dirent *direntry){
1768
1193
/* Skip "." and ".." */
1769
1194
if(direntry->d_name[0] == '.'
1775
1200
return 1;
1776
1201
}
1777
1202
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1780
int runnable_hook(const struct dirent *direntry){
1781
int ret;
1782
size_t sret;
1783
struct stat st;
1784
1785
if((direntry->d_name)[0] == '\0'){
1786
/* Empty name? */
1787
return 0;
1788
}
1789
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
"abcdefghijklmnopqrstuvwxyz"
1792
"0123456789"
1793
"_.-");
1794
if((direntry->d_name)[sret] != '\0'){
1795
/* Contains non-allowed characters */
1796
if(debug){
1797
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1798
direntry->d_name);
1799
}
1800
return 0;
1801
}
1802
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1804
if(ret == -1){
1805
if(debug){
1806
perror_plus("Could not stat hook");
1807
}
1808
return 0;
1809
}
1810
if(not (S_ISREG(st.st_mode))){
1811
/* Not a regular file */
1812
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1814
direntry->d_name);
1815
}
1816
return 0;
1817
}
1818
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1819
/* Not executable */
1820
if(debug){
1821
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1822
direntry->d_name);
1823
}
1824
return 0;
1825
}
1826
if(debug){
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1828
direntry->d_name);
1829
}
1830
return 1;
1831
}
1832
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1836
1204
int ret;
1837
1205
struct timespec now;
1838
1206
struct timespec waited_time;
1839
1207
intmax_t block_time;
1840
1208
1841
1209
while(true){
1842
if(mc->current_server == NULL){
1843
if(debug){
1844
fprintf_plus(stderr, "Wait until first server is found."
1845
" No timeout!\n");
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1846
1214
}
1847
1215
ret = avahi_simple_poll_iterate(s, -1);
1848
1216
} else {
1849
if(debug){
1850
fprintf_plus(stderr, "Check current_server if we should run"
1851
" it, or wait\n");
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1852
1220
}
1853
1221
/* the current time */
1854
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1859
1227
/* Calculating in ms how long time between now and server
1860
1228
who we visted longest time ago. Now - last seen. */
1861
1229
waited_time.tv_sec = (now.tv_sec
1862
- mc->current_server->last_seen.tv_sec);
1230
- mc.current_server->last_seen.tv_sec);
1863
1231
waited_time.tv_nsec = (now.tv_nsec
1864
- mc->current_server->last_seen.tv_nsec);
1232
- mc.current_server->last_seen.tv_nsec);
1865
1233
/* total time is 10s/10,000ms.
1866
1234
Converting to s from ms by dividing by 1,000,
1867
1235
and ns to ms by dividing by 1,000,000. */
1868
1236
block_time = ((retry_interval
1869
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1870
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1871
1872
if(debug){
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
block_time);
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1875
1242
}
1876
1243
1877
1244
if(block_time <= 0){
1878
ret = start_mandos_communication(mc->current_server->ip,
1879
mc->current_server->port,
1880
mc->current_server->if_index,
1881
mc->current_server->af, mc);
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1882
1249
if(ret == 0){
1883
avahi_simple_poll_quit(s);
1250
avahi_simple_poll_quit(mc.simple_poll);
1884
1251
return 0;
1885
1252
}
1886
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1887
&mc->current_server->last_seen);
1254
&mc.current_server->last_seen);
1888
1255
if(ret == -1){
1889
1256
perror_plus("clock_gettime");
1890
1257
return -1;
1891
1258
}
1892
mc->current_server = mc->current_server->next;
1259
mc.current_server = mc.current_server->next;
1893
1260
block_time = 0; /* Call avahi to find new Mandos
1894
1261
servers, but don't block */
1895
1262
}
1897
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1898
1265
}
1899
1266
if(ret != 0){
1900
if(ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1901
1268
return (ret != 1) ? ret : 0;
1902
1269
}
1903
1270
}
1904
1271
}
1905
1272
}
1906
1273
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1909
const float delay){
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1927
if(devnull == -1){
1928
perror_plus("open(\"/dev/null\", O_RDONLY)");
1929
return;
1930
}
1931
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1932
runnable_hook, alphasort);
1933
if(numhooks == -1){
1934
perror_plus("scandir");
1935
close(devnull);
1936
return;
1937
}
1938
struct dirent *direntry;
1939
int ret;
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1942
if(debug){
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
direntry->d_name);
1945
}
1946
pid_t hook_pid = fork();
1947
if(hook_pid == 0){
1948
/* Child */
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1951
if(errno != 0){
1952
perror_plus("Failed to raise privileges");
1953
_exit(EX_NOPERM);
1954
}
1955
/* Set group */
1956
errno = 0;
1957
ret = setgid(0);
1958
if(ret == -1){
1959
perror_plus("setgid");
1960
_exit(EX_NOPERM);
1961
}
1962
/* Reset supplementary groups */
1963
errno = 0;
1964
ret = setgroups(0, NULL);
1965
if(ret == -1){
1966
perror_plus("setgroups");
1967
_exit(EX_NOPERM);
1968
}
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("DEVICE", interface, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
if(ret == -1){
1981
perror_plus("setenv");
1982
_exit(EX_OSERR);
1983
}
1984
ret = setenv("MODE", mode, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
char *delaystring;
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1991
if(ret == -1){
1992
perror_plus("asprintf");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1997
free(delaystring);
1998
perror_plus("setenv");
1999
_exit(EX_OSERR);
2000
}
2001
free(delaystring);
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2004
if(ret == -1){
2005
perror_plus("setenv");
2006
_exit(EX_OSERR);
2007
}
2008
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
2012
if(hook_fd == -1){
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2015
}
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2019
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
environ) == -1){
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2039
}
2040
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
int status;
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2049
free(direntry);
2050
continue;
2051
}
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2057
free(direntry);
2058
continue;
2059
}
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2063
WTERMSIG(status));
2064
free(direntry);
2065
continue;
2066
} else {
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
continue;
2071
}
2072
}
2073
if(debug){
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
direntry->d_name);
2076
}
2077
free(direntry);
2078
}
2079
free(direntries);
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2082
} else {
2083
hookdir_fd = -1;
2084
}
2085
close(devnull);
2086
}
2087
2088
__attribute__((nonnull, warn_unused_result))
2089
int bring_up_interface(const char *const interface,
2090
const float delay){
2091
int old_errno = errno;
2092
int ret;
2093
struct ifreq network;
2094
unsigned int if_index = if_nametoindex(interface);
2095
if(if_index == 0){
2096
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2097
errno = old_errno;
2098
return ENXIO;
2099
}
2100
2101
if(quit_now){
2102
errno = old_errno;
2103
return EINTR;
2104
}
2105
2106
if(not interface_is_up(interface)){
2107
int ret_errno = 0;
2108
int ioctl_errno = 0;
2109
if(not get_flags(interface, &network)){
2110
ret_errno = errno;
2111
fprintf_plus(stderr, "Failed to get flags for interface "
2112
"\"%s\"\n", interface);
2113
errno = old_errno;
2114
return ret_errno;
2115
}
2116
network.ifr_flags |= IFF_UP; /* set flag */
2117
2118
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2119
if(sd == -1){
2120
ret_errno = errno;
2121
perror_plus("socket");
2122
errno = old_errno;
2123
return ret_errno;
2124
}
2125
2126
if(quit_now){
2127
ret = close(sd);
2128
if(ret == -1){
2129
perror_plus("close");
2130
}
2131
errno = old_errno;
2132
return EINTR;
2133
}
2134
2135
if(debug){
2136
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2137
interface);
2138
}
2139
2140
/* Raise privileges */
2141
ret_errno = raise_privileges();
2142
if(ret_errno != 0){
2143
errno = ret_errno;
2144
perror_plus("Failed to raise privileges");
2145
}
2146
2147
#ifdef __linux__
2148
int ret_linux;
2149
bool restore_loglevel = false;
2150
if(ret_errno == 0){
2151
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2152
messages about the network interface to mess up the prompt */
2153
ret_linux = klogctl(8, NULL, 5);
2154
if(ret_linux == -1){
2155
perror_plus("klogctl");
2156
} else {
2157
restore_loglevel = true;
2158
}
2159
}
2160
#endif /* __linux__ */
2161
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2162
ioctl_errno = errno;
2163
#ifdef __linux__
2164
if(restore_loglevel){
2165
ret_linux = klogctl(7, NULL, 0);
2166
if(ret_linux == -1){
2167
perror_plus("klogctl");
2168
}
2169
}
2170
#endif /* __linux__ */
2171
2172
/* If raise_privileges() succeeded above */
2173
if(ret_errno == 0){
2174
/* Lower privileges */
2175
ret_errno = lower_privileges();
2176
if(ret_errno != 0){
2177
errno = ret_errno;
2178
perror_plus("Failed to lower privileges");
2179
}
2180
}
2181
2182
/* Close the socket */
2183
ret = close(sd);
2184
if(ret == -1){
2185
perror_plus("close");
2186
}
2187
2188
if(ret_setflags == -1){
2189
errno = ioctl_errno;
2190
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2191
errno = old_errno;
2192
return ioctl_errno;
2193
}
2194
} else if(debug){
2195
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2196
interface);
2197
}
2198
2199
/* Sleep checking until interface is running.
2200
Check every 0.25s, up to total time of delay */
2201
for(int i = 0; i < delay * 4; i++){
2202
if(interface_is_running(interface)){
2203
break;
2204
}
2205
struct timespec sleeptime = { .tv_nsec = 250000000 };
2206
ret = nanosleep(&sleeptime, NULL);
2207
if(ret == -1 and errno != EINTR){
2208
perror_plus("nanosleep");
2209
}
2210
}
2211
2212
errno = old_errno;
2213
return 0;
2214
}
2215
2216
__attribute__((nonnull, warn_unused_result))
2217
int take_down_interface(const char *const interface){
2218
int old_errno = errno;
2219
struct ifreq network;
2220
unsigned int if_index = if_nametoindex(interface);
2221
if(if_index == 0){
2222
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2223
errno = old_errno;
2224
return ENXIO;
2225
}
2226
if(interface_is_up(interface)){
2227
int ret_errno = 0;
2228
int ioctl_errno = 0;
2229
if(not get_flags(interface, &network) and debug){
2230
ret_errno = errno;
2231
fprintf_plus(stderr, "Failed to get flags for interface "
2232
"\"%s\"\n", interface);
2233
errno = old_errno;
2234
return ret_errno;
2235
}
2236
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2237
2238
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2239
if(sd == -1){
2240
ret_errno = errno;
2241
perror_plus("socket");
2242
errno = old_errno;
2243
return ret_errno;
2244
}
2245
2246
if(debug){
2247
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2248
interface);
2249
}
2250
2251
/* Raise privileges */
2252
ret_errno = raise_privileges();
2253
if(ret_errno != 0){
2254
errno = ret_errno;
2255
perror_plus("Failed to raise privileges");
2256
}
2257
2258
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2259
ioctl_errno = errno;
2260
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
2270
2271
/* Close the socket */
2272
int ret = close(sd);
2273
if(ret == -1){
2274
perror_plus("close");
2275
}
2276
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2280
errno = old_errno;
2281
return ioctl_errno;
2282
}
2283
} else if(debug){
2284
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2285
interface);
2286
}
2287
2288
errno = old_errno;
2289
return 0;
2290
}
2291
2292
1274
int main(int argc, char *argv[]){
2293
mandos_context mc = { .server = NULL, .dh_bits = 0,
2294
.priority = "SECURE256:!CTYPE-X.509"
2295
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2296
.current_server = NULL, .interfaces = NULL,
2297
.interfaces_size = 0 };
2298
1275
AvahiSServiceBrowser *sb = NULL;
2299
error_t ret_errno;
1276
int error;
2300
1277
int ret;
2301
1278
intmax_t tmpmax;
2302
1279
char *tmp;
2303
1280
int exitcode = EXIT_SUCCESS;
2304
char *interfaces_to_take_down = NULL;
2305
size_t interfaces_to_take_down_size = 0;
2306
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2307
char old_tempdir[] = "/tmp/mandosXXXXXX";
2308
char *tempdir = NULL;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
2309
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2310
1290
const char *seckey = PATHDIR "/" SECKEY;
2311
1291
const char *pubkey = PATHDIR "/" PUBKEY;
2312
const char *dh_params_file = NULL;
2313
char *interfaces_hooks = NULL;
2314
1292
2315
1293
bool gnutls_initialized = false;
2316
1294
bool gpgme_initialized = false;
2368
1346
.doc = "Bit length of the prime number used in the"
2369
1347
" Diffie-Hellman key exchange",
2370
1348
.group = 2 },
2371
{ .name = "dh-params", .key = 134,
2372
.arg = "FILE",
2373
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2374
" for the Diffie-Hellman key exchange",
2375
.group = 2 },
2376
1349
{ .name = "priority", .key = 130,
2377
1350
.arg = "STRING",
2378
1351
.doc = "GnuTLS priority string for the TLS handshake",
2383
1356
.group = 2 },
2384
1357
{ .name = "retry", .key = 132,
2385
1358
.arg = "SECONDS",
2386
.doc = "Retry interval used when denied by the Mandos server",
2387
.group = 2 },
2388
{ .name = "network-hook-dir", .key = 133,
2389
.arg = "DIR",
2390
.doc = "Directory where network hooks are located",
1359
.doc = "Retry interval used when denied by the mandos server",
2391
1360
.group = 2 },
2392
1361
/*
2393
1362
* These reproduce what we would get without ARGP_NO_HELP
2412
1381
connect_to = arg;
2413
1382
break;
2414
1383
case 'i': /* --interface */
2415
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2416
arg, (int)',');
2417
if(ret_errno != 0){
2418
argp_error(state, "%s", strerror(ret_errno));
2419
}
1384
interface = arg;
2420
1385
break;
2421
1386
case 's': /* --seckey */
2422
1387
seckey = arg;
2433
1398
}
2434
1399
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2435
1400
break;
2436
case 134: /* --dh-params */
2437
dh_params_file = arg;
2438
break;
2439
1401
case 130: /* --priority */
2440
1402
mc.priority = arg;
2441
1403
break;
2449
1411
errno = 0;
2450
1412
retry_interval = strtod(arg, &tmp);
2451
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
2452
or (retry_interval * 1000) > INT_MAX
2453
or retry_interval < 0){
1414
or (retry_interval * 1000) > INT_MAX){
2454
1415
argp_error(state, "Bad retry interval");
2455
1416
}
2456
1417
break;
2457
case 133: /* --network-hook-dir */
2458
hookdir = arg;
2459
break;
2460
1418
/*
2461
1419
* These reproduce what we would get without ARGP_NO_HELP
2462
1420
*/
2468
1426
argp_state_help(state, state->out_stream,
2469
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2470
1428
case 'V': /* --version */
2471
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
2472
1430
exit(argp_err_exit_status);
2473
1431
break;
2474
1432
default:
2481
1439
.args_doc = "",
2482
1440
.doc = "Mandos client -- Get and decrypt"
2483
1441
" passwords from a Mandos server" };
2484
ret_errno = argp_parse(&argp, argc, argv,
2485
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2486
switch(ret_errno){
1442
ret = argp_parse(&argp, argc, argv,
1443
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1444
switch(ret){
2487
1445
case 0:
2488
1446
break;
2489
1447
case ENOMEM:
2490
1448
default:
2491
errno = ret_errno;
1449
errno = ret;
2492
1450
perror_plus("argp_parse");
2493
1451
exitcode = EX_OSERR;
2494
1452
goto end;
2497
1455
goto end;
2498
1456
}
2499
1457
}
2500
1458
2501
1459
{
2502
1460
/* Work around Debian bug #633582:
2503
<https://bugs.debian.org/633582> */
2504
2505
/* Re-raise privileges */
2506
ret = raise_privileges();
2507
if(ret != 0){
2508
errno = ret;
2509
perror_plus("Failed to raise privileges");
2510
} else {
2511
struct stat st;
2512
2513
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2514
int seckey_fd = open(seckey, O_RDONLY);
2515
if(seckey_fd == -1){
2516
perror_plus("open");
2517
} else {
2518
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2519
if(ret == -1){
2520
perror_plus("fstat");
2521
} else {
2522
if(S_ISREG(st.st_mode)
2523
and st.st_uid == 0 and st.st_gid == 0){
2524
ret = fchown(seckey_fd, uid, gid);
2525
if(ret == -1){
2526
perror_plus("fchown");
2527
}
2528
}
2529
}
2530
close(seckey_fd);
2531
}
2532
}
2533
2534
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2535
int pubkey_fd = open(pubkey, O_RDONLY);
2536
if(pubkey_fd == -1){
2537
perror_plus("open");
2538
} else {
2539
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2540
if(ret == -1){
2541
perror_plus("fstat");
2542
} else {
2543
if(S_ISREG(st.st_mode)
2544
and st.st_uid == 0 and st.st_gid == 0){
2545
ret = fchown(pubkey_fd, uid, gid);
2546
if(ret == -1){
2547
perror_plus("fchown");
2548
}
2549
}
2550
}
2551
close(pubkey_fd);
2552
}
2553
}
2554
2555
if(dh_params_file != NULL
2556
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2557
int dhparams_fd = open(dh_params_file, O_RDONLY);
2558
if(dhparams_fd == -1){
2559
perror_plus("open");
2560
} else {
2561
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2562
if(ret == -1){
2563
perror_plus("fstat");
2564
} else {
2565
if(S_ISREG(st.st_mode)
2566
and st.st_uid == 0 and st.st_gid == 0){
2567
ret = fchown(dhparams_fd, uid, gid);
2568
if(ret == -1){
2569
perror_plus("fchown");
2570
}
2571
}
2572
}
2573
close(dhparams_fd);
2574
}
2575
}
2576
2577
/* Lower privileges */
2578
ret = lower_privileges();
2579
if(ret != 0){
2580
errno = ret;
2581
perror_plus("Failed to lower privileges");
2582
}
2583
}
2584
}
2585
2586
/* Remove invalid interface names (except "none") */
2587
{
2588
char *interface = NULL;
2589
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2590
interface))){
2591
if(strcmp(interface, "none") != 0
2592
and if_nametoindex(interface) == 0){
2593
if(interface[0] != '\0'){
2594
fprintf_plus(stderr, "Not using nonexisting interface"
2595
" \"%s\"\n", interface);
2596
}
2597
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2598
interface = NULL;
2599
}
2600
}
2601
}
2602
2603
/* Run network hooks */
2604
{
2605
if(mc.interfaces != NULL){
2606
interfaces_hooks = malloc(mc.interfaces_size);
2607
if(interfaces_hooks == NULL){
2608
perror_plus("malloc");
2609
goto end;
2610
}
2611
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2612
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2613
}
2614
run_network_hooks("start", interfaces_hooks != NULL ?
2615
interfaces_hooks : "", delay);
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
2616
1513
}
2617
1514
2618
1515
if(not debug){
2619
1516
avahi_set_log_function(empty_log);
2620
1517
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
2621
1543
2622
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2623
1545
from the signal handler */
2624
1546
/* Initialize the pseudo-RNG for Avahi */
2625
1547
srand((unsigned int) time(NULL));
2626
simple_poll = avahi_simple_poll_new();
2627
if(simple_poll == NULL){
2628
fprintf_plus(stderr,
2629
"Avahi: Failed to create simple poll object.\n");
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2630
1551
exitcode = EX_UNAVAILABLE;
2631
1552
goto end;
2632
1553
}
2694
1615
}
2695
1616
}
2696
1617
2697
/* If no interfaces were specified, make a list */
2698
if(mc.interfaces == NULL){
2699
struct dirent **direntries = NULL;
2700
/* Look for any good interfaces */
2701
ret = scandir(sys_class_net, &direntries, good_interface,
2702
alphasort);
2703
if(ret >= 1){
2704
/* Add all found interfaces to interfaces list */
2705
for(int i = 0; i < ret; ++i){
2706
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2707
direntries[i]->d_name);
2708
if(ret_errno != 0){
2709
errno = ret_errno;
2710
perror_plus("argz_add");
2711
free(direntries[i]);
2712
continue;
2713
}
2714
if(debug){
2715
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2716
direntries[i]->d_name);
2717
}
2718
free(direntries[i]);
2719
}
2720
free(direntries);
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
1703
}
1704
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
break;
1723
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
2721
1754
} else {
2722
if(ret == 0){
2723
free(direntries);
2724
}
2725
fprintf_plus(stderr, "Could not find a network interface\n");
2726
exitcode = EXIT_FAILURE;
2727
goto end;
2728
}
2729
}
2730
2731
/* Bring up interfaces which are down, and remove any "none"s */
2732
{
2733
char *interface = NULL;
2734
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2735
interface))){
2736
/* If interface name is "none", stop bringing up interfaces.
2737
Also remove all instances of "none" from the list */
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
interface);
2741
interface = NULL;
2742
while((interface = argz_next(mc.interfaces,
2743
mc.interfaces_size, interface))){
2744
if(strcmp(interface, "none") == 0){
2745
argz_delete(&mc.interfaces, &mc.interfaces_size,
2746
interface);
2747
interface = NULL;
2748
}
2749
}
2750
break;
2751
}
2752
bool interface_was_up = interface_is_up(interface);
2753
errno = bring_up_interface(interface, delay);
2754
if(not interface_was_up){
2755
if(errno != 0){
2756
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2757
" %s\n", interface, strerror(errno));
2758
} else {
2759
errno = argz_add(&interfaces_to_take_down,
2760
&interfaces_to_take_down_size,
2761
interface);
2762
if(errno != 0){
2763
perror_plus("argz_add");
2764
}
2765
}
2766
}
2767
}
2768
if(debug and (interfaces_to_take_down == NULL)){
2769
fprintf_plus(stderr, "No interfaces were brought up\n");
2770
}
2771
}
2772
2773
/* If we only got one interface, explicitly use only that one */
2774
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2775
if(debug){
2776
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2777
mc.interfaces);
2778
}
2779
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
2780
1761
}
2781
1762
2782
1763
if(quit_now){
2783
1764
goto end;
2784
1765
}
2785
1766
2786
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1767
ret = init_gnutls_global(pubkey, seckey);
2787
1768
if(ret == -1){
2788
fprintf_plus(stderr, "init_gnutls_global failed\n");
1769
fprintf(stderr, "init_gnutls_global failed\n");
2789
1770
exitcode = EX_UNAVAILABLE;
2790
1771
goto end;
2791
1772
} else {
2796
1777
goto end;
2797
1778
}
2798
1779
2799
/* Try /run/tmp before /tmp */
2800
tempdir = mkdtemp(run_tempdir);
2801
if(tempdir == NULL and errno == ENOENT){
2802
if(debug){
2803
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2804
run_tempdir, old_tempdir);
2805
}
2806
tempdir = mkdtemp(old_tempdir);
2807
}
2808
if(tempdir == NULL){
1780
if(mkdtemp(tempdir) == NULL){
2809
1781
perror_plus("mkdtemp");
2810
1782
goto end;
2811
1783
}
1784
tempdir_created = true;
2812
1785
2813
1786
if(quit_now){
2814
1787
goto end;
2815
1788
}
2816
1789
2817
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2818
fprintf_plus(stderr, "init_gpgme failed\n");
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2819
1792
exitcode = EX_UNAVAILABLE;
2820
1793
goto end;
2821
1794
} else {
2830
1803
/* Connect directly, do not use Zeroconf */
2831
1804
/* (Mainly meant for debugging) */
2832
1805
char *address = strrchr(connect_to, ':');
2833
2834
1806
if(address == NULL){
2835
fprintf_plus(stderr, "No colon in address\n");
1807
fprintf(stderr, "No colon in address\n");
2836
1808
exitcode = EX_USAGE;
2837
1809
goto end;
2838
1810
}
2841
1813
goto end;
2842
1814
}
2843
1815
2844
in_port_t port;
1816
uint16_t port;
2845
1817
errno = 0;
2846
1818
tmpmax = strtoimax(address+1, &tmp, 10);
2847
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2848
or tmpmax != (in_port_t)tmpmax){
2849
fprintf_plus(stderr, "Bad port number\n");
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2850
1822
exitcode = EX_USAGE;
2851
1823
goto end;
2852
1824
}
2853
1825
2854
1826
if(quit_now){
2855
1827
goto end;
2856
1828
}
2857
1829
2858
port = (in_port_t)tmpmax;
1830
port = (uint16_t)tmpmax;
2859
1831
*address = '\0';
1832
address = connect_to;
2860
1833
/* Colon in address indicates IPv6 */
2861
1834
int af;
2862
if(strchr(connect_to, ':') != NULL){
1835
if(strchr(address, ':') != NULL){
2863
1836
af = AF_INET6;
2864
/* Accept [] around IPv6 address - see RFC 5952 */
2865
if(connect_to[0] == '[' and address[-1] == ']')
2866
{
2867
connect_to++;
2868
address[-1] = '\0';
2869
}
2870
1837
} else {
2871
1838
af = AF_INET;
2872
1839
}
2873
address = connect_to;
2874
1840
2875
1841
if(quit_now){
2876
1842
goto end;
2877
1843
}
2878
1844
2879
1845
while(not quit_now){
2880
ret = start_mandos_communication(address, port, if_index, af,
2881
&mc);
1846
ret = start_mandos_communication(address, port, if_index, af);
2882
1847
if(quit_now or ret == 0){
2883
1848
break;
2884
1849
}
2885
if(debug){
2886
fprintf_plus(stderr, "Retrying in %d seconds\n",
2887
(int)retry_interval);
2888
}
2889
sleep((unsigned int)retry_interval);
2890
}
2891
2892
if(not quit_now){
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
2893
1854
exitcode = EXIT_SUCCESS;
2894
1855
}
2895
1856
2896
1857
goto end;
2897
1858
}
2898
1859
2910
1871
config.publish_domain = 0;
2911
1872
2912
1873
/* Allocate a new server */
2913
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2914
&config, NULL, NULL, &ret);
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2915
1877
2916
1878
/* Free the Avahi configuration data */
2917
1879
avahi_server_config_free(&config);
2919
1881
2920
1882
/* Check if creating the Avahi server object succeeded */
2921
1883
if(mc.server == NULL){
2922
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2923
avahi_strerror(ret));
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2924
1886
exitcode = EX_UNAVAILABLE;
2925
1887
goto end;
2926
1888
}
2932
1894
/* Create the Avahi service browser */
2933
1895
sb = avahi_s_service_browser_new(mc.server, if_index,
2934
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2935
NULL, 0, browse_callback,
2936
(void *)&mc);
1897
NULL, 0, browse_callback, NULL);
2937
1898
if(sb == NULL){
2938
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2939
avahi_strerror(avahi_server_errno(mc.server)));
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2940
1901
exitcode = EX_UNAVAILABLE;
2941
1902
goto end;
2942
1903
}
2948
1909
/* Run the main loop */
2949
1910
2950
1911
if(debug){
2951
fprintf_plus(stderr, "Starting Avahi loop search\n");
1912
fprintf(stderr, "Starting Avahi loop search\n");
2952
1913
}
2953
2954
ret = avahi_loop_with_timeout(simple_poll,
2955
(int)(retry_interval * 1000), &mc);
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2956
1917
if(debug){
2957
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2958
(ret == 0) ? "successfully" : "with error");
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2959
1920
}
2960
1921
2961
1922
end:
2962
1923
2963
1924
if(debug){
2964
if(signal_received){
2965
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2966
argv[0], signal_received,
2967
strsignal(signal_received));
2968
} else {
2969
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
}
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2971
1926
}
2972
1927
2973
1928
/* Cleanup things */
2974
free(mc.interfaces);
2975
2976
1929
if(sb != NULL)
2977
1930
avahi_s_service_browser_free(sb);
2978
1931
2979
1932
if(mc.server != NULL)
2980
1933
avahi_server_free(mc.server);
2981
1934
2982
if(simple_poll != NULL)
2983
avahi_simple_poll_free(simple_poll);
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2984
1937
2985
1938
if(gnutls_initialized){
2986
1939
gnutls_certificate_free_credentials(mc.cred);
1940
gnutls_global_deinit();
2987
1941
gnutls_dh_params_deinit(mc.dh_params);
2988
1942
}
2989
1943
2990
1944
if(gpgme_initialized){
2991
1945
gpgme_release(mc.ctx);
2992
1946
}
2993
1947
2994
1948
/* Cleans up the circular linked list of Mandos servers the client
2995
1949
has seen */
2996
1950
if(mc.current_server != NULL){
2997
1951
mc.current_server->prev->next = NULL;
2998
1952
while(mc.current_server != NULL){
2999
1953
server *next = mc.current_server->next;
3000
#ifdef __GNUC__
3001
#pragma GCC diagnostic push
3002
#pragma GCC diagnostic ignored "-Wcast-qual"
3003
#endif
3004
free((char *)(mc.current_server->ip));
3005
#ifdef __GNUC__
3006
#pragma GCC diagnostic pop
3007
#endif
3008
1954
free(mc.current_server);
3009
1955
mc.current_server = next;
3010
1956
}
3011
1957
}
3012
1958
3013
/* Re-raise privileges */
3014
{
3015
ret = raise_privileges();
3016
if(ret != 0){
3017
errno = ret;
3018
perror_plus("Failed to raise privileges");
3019
} else {
3020
3021
/* Run network hooks */
3022
run_network_hooks("stop", interfaces_hooks != NULL ?
3023
interfaces_hooks : "", delay);
3024
3025
/* Take down the network interfaces which were brought up */
3026
{
3027
char *interface = NULL;
3028
while((interface = argz_next(interfaces_to_take_down,
3029
interfaces_to_take_down_size,
3030
interface))){
3031
ret = take_down_interface(interface);
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to take down interface");
3035
}
3036
}
3037
if(debug and (interfaces_to_take_down == NULL)){
3038
fprintf_plus(stderr, "No interfaces needed to be taken"
3039
" down\n");
3040
}
3041
}
3042
}
3043
3044
ret = lower_privileges_permanently();
3045
if(ret != 0){
3046
errno = ret;
3047
perror_plus("Failed to lower privileges permanently");
3048
}
3049
}
3050
3051
free(interfaces_to_take_down);
3052
free(interfaces_hooks);
3053
3054
void clean_dir_at(int base, const char * const dirname,
3055
uintmax_t level){
3056
struct dirent **direntries = NULL;
3057
int dret;
3058
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3059
O_RDONLY
3060
| O_NOFOLLOW
3061
| O_DIRECTORY
3062
| O_PATH));
3063
if(dir_fd == -1){
3064
perror_plus("open");
3065
return;
3066
}
3067
int numentries = scandirat(dir_fd, ".", &direntries,
3068
notdotentries, alphasort);
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
if(debug){
3072
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3073
dirname, direntries[i]->d_name);
3074
}
3075
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3076
if(dret == -1){
3077
if(errno == EISDIR){
3078
dret = unlinkat(dir_fd, direntries[i]->d_name,
3079
AT_REMOVEDIR);
3080
}
3081
if((dret == -1) and (errno == ENOTEMPTY)
3082
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3083
== 0) and (level == 0)){
3084
/* Recurse only in this special case */
3085
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3086
dret = 0;
3087
}
3088
if((dret == -1) and (errno != ENOENT)){
3089
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3090
direntries[i]->d_name, strerror(errno));
3091
}
3092
}
3093
free(direntries[i]);
3094
}
3095
3096
/* need to clean even if 0 because man page doesn't specify */
3097
free(direntries);
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1976
}
1977
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
}
3106
1989
}
3107
1990
3108
1991
/* Removes the GPGME temp directory and all files inside */
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
1992
if(tempdir_created){
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1999
char *fullname = NULL;
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
direntry->d_name);
2002
if(ret < 0){
2003
perror_plus("asprintf");
2004
continue;
2005
}
2006
ret = remove(fullname);
2007
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2010
}
2011
free(fullname);
2012
}
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
2020
}
2021
ret = rmdir(tempdir);
2022
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
2024
}
3111
2025
}
3112
2026
3113
2027
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0