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 24.1.172
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.172
- Committer: Björn Påhlsson
- Date: 2011-06-18 22:51:12 UTC
- mto: This revision was merged to the branch mainline in revision 485.
- Revision ID: belorn@fukt.bsnet.se-20110618225112-rnt2m4ek32758f80
using scandir instead of readdir
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
55
54
SOCK_STREAM, uid_t, gid_t, open(),
56
55
opendir(), DIR */
57
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
61
*/
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
63
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
71
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
72
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
74
68
SIOCSIFFLAGS, if_indextoname(),
78
72
*/
79
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
74
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
84
77
#include <iso646.h> /* not, or, and */
85
78
#include <argp.h> /* struct argp_option, error_t, struct
86
79
argp_state, struct argp,
91
84
raise() */
92
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
93
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
95
WEXITSTATUS(), WTERMSIG() */
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
103
87
104
88
#ifdef __linux__
105
89
#include <sys/klog.h> /* klogctl() */
123
107
init_gnutls_session(),
124
108
GNUTLS_* */
125
109
#include <gnutls/openpgp.h>
126
/* gnutls_certificate_set_openpgp_key_file(),
127
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
128
112
129
113
/* GPGME */
130
114
#include <gpgme.h> /* All GPGME types, constants and
138
122
#define PATHDIR "/conf/conf.d/mandos"
139
123
#define SECKEY "seckey.txt"
140
124
#define PUBKEY "pubkey.txt"
141
#define HOOKDIR "/lib/mandos/network-hooks.d"
142
125
143
126
bool debug = false;
144
127
static const char mandos_protocol_version[] = "1";
145
128
const char *argp_program_version = "mandos-client " VERSION;
146
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
147
130
static const char sys_class_net[] = "/sys/class/net";
148
131
char *connect_to = NULL;
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
153
154
/* Doubly linked list that need to be circularly linked when used */
155
typedef struct server{
156
const char *ip;
157
in_port_t port;
158
AvahiIfIndex if_index;
159
int af;
160
struct timespec last_seen;
161
struct server *next;
162
struct server *prev;
163
} server;
164
132
165
133
/* Used for passing in values through the Avahi callback functions */
166
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
167
136
AvahiServer *server;
168
137
gnutls_certificate_credentials_t cred;
169
138
unsigned int dh_bits;
170
139
gnutls_dh_params_t dh_params;
171
140
const char *priority;
172
141
gpgme_ctx_t ctx;
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
176
142
} mandos_context;
177
143
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
180
148
181
149
sig_atomic_t quit_now = 0;
182
150
int signal_received = 0;
183
151
184
/* Function to use when printing errors */
185
void perror_plus(const char *print_text){
186
int e = errno;
187
fprintf(stderr, "Mandos plugin %s: ",
188
program_invocation_short_name);
189
errno = e;
190
perror(print_text);
191
}
192
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
int fprintf_plus(FILE *stream, const char *format, ...){
195
va_list ap;
196
va_start (ap, format);
197
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
}
202
203
152
/*
204
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
205
154
* bytes. "buffer_capacity" is how much is currently allocated,
206
155
* "buffer_length" is how much is already used.
207
156
*/
208
__attribute__((nonnull, warn_unused_result))
209
157
size_t incbuffer(char **buffer, size_t buffer_length,
210
size_t buffer_capacity){
158
size_t buffer_capacity){
211
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
218
162
return 0;
219
163
}
220
*buffer = new_buf;
221
164
buffer_capacity += BUFFER_SIZE;
222
165
}
223
166
return buffer_capacity;
224
167
}
225
168
226
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
230
int ret;
231
server *new_server = malloc(sizeof(server));
232
if(new_server == NULL){
233
perror_plus("malloc");
234
return false;
235
}
236
*new_server = (server){ .ip = strdup(ip),
237
.port = port,
238
.if_index = if_index,
239
.af = af };
240
if(new_server->ip == NULL){
241
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
return false;
258
}
259
/* Special case of first server */
260
if(*current_server == NULL){
261
new_server->next = new_server;
262
new_server->prev = new_server;
263
*current_server = new_server;
264
} else {
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
268
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
270
}
271
return true;
272
}
273
274
169
/*
275
170
* Initialize GPGME.
276
171
*/
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
282
174
gpgme_error_t rc;
283
175
gpgme_engine_info_t engine_info;
284
176
177
285
178
/*
286
179
* Helper function to insert pub and seckey to the engine keyring.
287
180
*/
288
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
289
182
int ret;
290
183
int fd;
291
184
gpgme_data_t pgp_data;
292
185
293
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
187
if(fd == -1){
295
perror_plus("open");
188
perror("open");
296
189
return false;
297
190
}
298
191
299
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
300
193
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
303
196
return false;
304
197
}
305
198
306
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
307
200
if(rc != GPG_ERR_NO_ERROR){
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
310
203
return false;
311
204
}
312
205
313
ret = close(fd);
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
207
if(ret == -1){
315
perror_plus("close");
208
perror("close");
316
209
}
317
210
gpgme_data_release(pgp_data);
318
211
return true;
319
212
}
320
213
321
214
if(debug){
322
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
323
216
}
324
217
325
218
/* Init GPGME */
326
219
gpgme_check_version(NULL);
327
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
328
221
if(rc != GPG_ERR_NO_ERROR){
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
331
224
return false;
332
225
}
333
226
334
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
335
228
rc = gpgme_get_engine_info(&engine_info);
336
229
if(rc != GPG_ERR_NO_ERROR){
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
339
232
return false;
340
233
}
341
234
while(engine_info != NULL){
347
240
engine_info = engine_info->next;
348
241
}
349
242
if(engine_info == NULL){
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
351
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
352
244
return false;
353
245
}
354
246
355
247
/* Create new GPGME "context" */
356
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
357
249
if(rc != GPG_ERR_NO_ERROR){
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
361
252
return false;
362
253
}
363
254
372
263
* Decrypt OpenPGP data.
373
264
* Returns -1 on error
374
265
*/
375
__attribute__((nonnull, warn_unused_result))
376
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
377
267
size_t crypto_size,
378
char **plaintext,
379
mandos_context *mc){
268
char **plaintext){
380
269
gpgme_data_t dh_crypto, dh_plain;
381
270
gpgme_error_t rc;
382
271
ssize_t ret;
384
273
ssize_t plaintext_length = 0;
385
274
386
275
if(debug){
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
388
277
}
389
278
390
279
/* Create new GPGME data buffer from memory cryptotext */
391
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
392
281
0);
393
282
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
396
285
return -1;
397
286
}
398
287
399
288
/* Create new empty GPGME data buffer for the plaintext */
400
289
rc = gpgme_data_new(&dh_plain);
401
290
if(rc != GPG_ERR_NO_ERROR){
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
405
293
gpgme_data_release(dh_crypto);
406
294
return -1;
407
295
}
408
296
409
297
/* Decrypt data from the cryptotext data buffer to the plaintext
410
298
data buffer */
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
300
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
415
303
plaintext_length = -1;
416
304
if(debug){
417
305
gpgme_decrypt_result_t result;
418
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
419
307
if(result == NULL){
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
421
309
} else {
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
426
314
if(result->file_name != NULL){
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
428
316
}
429
317
gpgme_recipient_t recipient;
430
318
recipient = result->recipients;
431
319
while(recipient != NULL){
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
438
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
439
326
recipient = recipient->next;
440
327
}
441
328
}
444
331
}
445
332
446
333
if(debug){
447
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
448
335
}
449
336
450
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
451
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
452
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
453
340
plaintext_length = -1;
454
341
goto decrypt_end;
455
342
}
457
344
*plaintext = NULL;
458
345
while(true){
459
346
plaintext_capacity = incbuffer(plaintext,
460
(size_t)plaintext_length,
461
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
462
349
if(plaintext_capacity == 0){
463
perror_plus("incbuffer");
464
plaintext_length = -1;
465
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
466
353
}
467
354
468
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
473
360
break;
474
361
}
475
362
if(ret < 0){
476
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
477
364
plaintext_length = -1;
478
365
goto decrypt_end;
479
366
}
481
368
}
482
369
483
370
if(debug){
484
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
485
372
for(ssize_t i = 0; i < plaintext_length; i++){
486
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
487
374
}
498
385
return plaintext_length;
499
386
}
500
387
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
392
ret = "(unknown)";
393
return ret;
512
394
}
513
395
514
396
/* GnuTLS log function callback */
515
__attribute__((nonnull))
516
397
static void debuggnutls(__attribute__((unused)) int level,
517
398
const char* string){
518
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
519
400
}
520
401
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
402
static int init_gnutls_global(const char *pubkeyfilename,
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
403
const char *seckeyfilename){
526
404
int ret;
527
unsigned int uret;
528
405
529
406
if(debug){
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
408
}
409
410
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
414
return -1;
531
415
}
532
416
533
417
if(debug){
539
423
}
540
424
541
425
/* OpenPGP credentials */
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
543
427
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
546
434
return -1;
547
435
}
548
436
549
437
if(debug){
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
552
pubkeyfilename,
553
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
554
441
}
555
442
556
443
ret = gnutls_certificate_set_openpgp_key_file
557
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
558
445
GNUTLS_OPENPGP_FMT_BASE64);
559
446
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr,
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
565
452
goto globalfail;
566
453
}
567
454
568
455
/* GnuTLS server initialization */
569
ret = gnutls_dh_params_init(&mc->dh_params);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
574
goto globalfail;
575
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
460
goto globalfail;
461
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
466
goto globalfail;
467
}
468
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
750
470
751
471
return 0;
752
472
753
473
globalfail:
754
474
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_certificate_free_credentials(mc.cred);
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
757
478
return -1;
758
479
}
759
480
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
762
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
763
482
int ret;
764
483
/* GnuTLS session creation */
765
484
do {
769
488
}
770
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
771
490
if(ret != GNUTLS_E_SUCCESS){
772
fprintf_plus(stderr,
773
"Error in GnuTLS session initialization: %s\n",
774
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
775
493
}
776
494
777
495
{
778
496
const char *err;
779
497
do {
780
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
781
499
if(quit_now){
782
500
gnutls_deinit(*session);
783
501
return -1;
784
502
}
785
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
786
504
if(ret != GNUTLS_E_SUCCESS){
787
fprintf_plus(stderr, "Syntax error at: %s\n", err);
788
fprintf_plus(stderr, "GnuTLS error: %s\n",
789
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
790
508
gnutls_deinit(*session);
791
509
return -1;
792
510
}
794
512
795
513
do {
796
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
797
mc->cred);
515
mc.cred);
798
516
if(quit_now){
799
517
gnutls_deinit(*session);
800
518
return -1;
801
519
}
802
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
803
521
if(ret != GNUTLS_E_SUCCESS){
804
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
805
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
806
524
gnutls_deinit(*session);
807
525
return -1;
808
526
}
810
528
/* ignore client certificate if any. */
811
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
530
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
813
533
return 0;
814
534
}
815
535
817
537
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
538
__attribute__((unused)) const char *txt){}
819
539
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
1038
540
/* Called when a Mandos server is found */
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
1041
542
AvahiIfIndex if_index,
1042
int af, mandos_context *mc){
543
int af){
1043
544
int ret, tcp_sd = -1;
1044
545
ssize_t sret;
1045
struct sockaddr_storage to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
1046
550
char *buffer = NULL;
1047
551
char *decrypted_buffer = NULL;
1048
552
size_t buffer_length = 0;
1051
555
int retval = -1;
1052
556
gnutls_session_t session;
1053
557
int pf; /* Protocol family */
1054
bool route_added = false;
1055
558
1056
559
errno = 0;
1057
560
1068
571
pf = PF_INET;
1069
572
break;
1070
573
default:
1071
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
1072
575
errno = EINVAL;
1073
576
return -1;
1074
577
}
1075
578
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1079
bool match = false;
1080
{
1081
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
match = true;
1087
break;
1088
}
1089
}
1090
}
1091
if(not match){
1092
/* This interface does not match any in the list, so we don't
1093
connect to the server */
1094
if(debug){
1095
char interface[IF_NAMESIZE];
1096
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1097
perror_plus("if_indextoname");
1098
} else {
1099
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
" \"%s\"\n",
1101
if_indextoname((unsigned int)if_index,
1102
interface));
1103
}
1104
}
1105
return -1;
1106
}
1107
}
1108
1109
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
1110
580
if(ret != 0){
1111
581
return -1;
1112
582
}
1113
583
1114
584
if(debug){
1115
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1116
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
1117
587
}
1118
588
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
590
if(tcp_sd < 0){
1121
591
int e = errno;
1122
perror_plus("socket");
592
perror("socket");
1123
593
errno = e;
1124
594
goto mandos_end;
1125
595
}
1129
599
goto mandos_end;
1130
600
}
1131
601
602
memset(&to, 0, sizeof(to));
1132
603
if(af == AF_INET6){
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1136
606
} else { /* IPv4 */
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
1140
609
}
1141
610
if(ret < 0 ){
1142
611
int e = errno;
1143
perror_plus("inet_pton");
612
perror("inet_pton");
1144
613
errno = e;
1145
614
goto mandos_end;
1146
615
}
1147
616
if(ret == 0){
1148
617
int e = errno;
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
1150
619
errno = e;
1151
620
goto mandos_end;
1152
621
}
1153
622
if(af == AF_INET6){
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
1157
630
if(if_index == AVAHI_IF_UNSPEC){
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
1160
633
errno = EINVAL;
1161
634
goto mandos_end;
1162
635
}
1163
636
/* Set the network interface number as scope */
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
637
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
638
}
1166
639
} else {
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
1168
643
}
1169
644
1170
645
if(quit_now){
1176
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1177
652
char interface[IF_NAMESIZE];
1178
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1179
perror_plus("if_indextoname");
654
perror("if_indextoname");
1180
655
} else {
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
1183
658
}
1184
659
} else {
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
1187
662
}
1188
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1189
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
679
}
680
}
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
1270
704
}
1271
705
1272
706
const char *out = mandos_protocol_version;
1274
708
while(true){
1275
709
size_t out_size = strlen(out);
1276
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1277
out_size - written));
711
out_size - written));
1278
712
if(ret == -1){
1279
713
int e = errno;
1280
perror_plus("write");
714
perror("write");
1281
715
errno = e;
1282
716
goto mandos_end;
1283
717
}
1300
734
}
1301
735
1302
736
if(debug){
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1304
738
}
1305
739
1306
740
if(quit_now){
1307
741
errno = EINTR;
1308
742
goto mandos_end;
1309
743
}
1310
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
744
745
/* Spurious warnings from -Wint-to-pointer-cast */
746
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1316
747
1317
748
if(quit_now){
1318
749
errno = EINTR;
1329
760
1330
761
if(ret != GNUTLS_E_SUCCESS){
1331
762
if(debug){
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1333
764
gnutls_perror(ret);
1334
765
}
1335
766
errno = EPROTO;
1339
770
/* Read OpenPGP packet that contains the wanted password */
1340
771
1341
772
if(debug){
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
773
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
774
ip);
1344
775
}
1345
776
1346
777
while(true){
1351
782
}
1352
783
1353
784
buffer_capacity = incbuffer(&buffer, buffer_length,
1354
buffer_capacity);
785
buffer_capacity);
1355
786
if(buffer_capacity == 0){
1356
787
int e = errno;
1357
perror_plus("incbuffer");
788
perror("incbuffer");
1358
789
errno = e;
1359
790
goto mandos_end;
1360
791
}
1384
815
}
1385
816
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1386
817
if(ret < 0){
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
818
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1389
819
gnutls_perror(ret);
1390
820
errno = EPROTO;
1391
821
goto mandos_end;
1392
822
}
1393
823
break;
1394
824
default:
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
825
fprintf(stderr, "Unknown error while reading data from"
826
" encrypted session with Mandos server\n");
1397
827
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1398
828
errno = EIO;
1399
829
goto mandos_end;
1404
834
}
1405
835
1406
836
if(debug){
1407
fprintf_plus(stderr, "Closing TLS session\n");
837
fprintf(stderr, "Closing TLS session\n");
1408
838
}
1409
839
1410
840
if(quit_now){
1422
852
1423
853
if(buffer_length > 0){
1424
854
ssize_t decrypted_buffer_size;
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
855
decrypted_buffer_size = pgp_packet_decrypt(buffer,
856
buffer_length,
857
&decrypted_buffer);
1427
858
if(decrypted_buffer_size >= 0){
1428
859
1429
clearerr(stdout);
1430
860
written = 0;
1431
861
while(written < (size_t) decrypted_buffer_size){
1432
862
if(quit_now){
1440
870
if(ret == 0 and ferror(stdout)){
1441
871
int e = errno;
1442
872
if(debug){
1443
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1444
strerror(errno));
873
fprintf(stderr, "Error writing encrypted data: %s\n",
874
strerror(errno));
1445
875
}
1446
876
errno = e;
1447
877
goto mandos_end;
1448
878
}
1449
879
written += (size_t)ret;
1450
880
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
1461
881
retval = 0;
1462
882
}
1463
883
}
1466
886
1467
887
mandos_end:
1468
888
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
1475
889
int e = errno;
1476
890
free(decrypted_buffer);
1477
891
free(buffer);
1478
892
if(tcp_sd >= 0){
1479
ret = close(tcp_sd);
893
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
894
}
1481
895
if(ret == -1){
1482
896
if(e == 0){
1483
897
e = errno;
1484
898
}
1485
perror_plus("close");
899
perror("close");
1486
900
}
1487
901
gnutls_deinit(session);
1488
errno = e;
1489
902
if(quit_now){
1490
errno = EINTR;
903
e = EINTR;
1491
904
retval = -1;
1492
905
}
906
errno = e;
1493
907
}
1494
908
return retval;
1495
909
}
1507
921
AVAHI_GCC_UNUSED AvahiStringList *txt,
1508
922
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1509
923
flags,
1510
void *mc){
1511
if(r == NULL){
1512
return;
1513
}
924
AVAHI_GCC_UNUSED void* userdata){
925
assert(r);
1514
926
1515
927
/* Called whenever a service has been resolved successfully or
1516
928
timed out */
1517
929
1518
930
if(quit_now){
1519
avahi_s_service_resolver_free(r);
1520
931
return;
1521
932
}
1522
933
1523
934
switch(event){
1524
935
default:
1525
936
case AVAHI_RESOLVER_FAILURE:
1526
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1527
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1528
domain,
1529
avahi_strerror(avahi_server_errno
1530
(((mandos_context*)mc)->server)));
937
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
938
" of type '%s' in domain '%s': %s\n", name, type, domain,
939
avahi_strerror(avahi_server_errno(mc.server)));
1531
940
break;
1532
941
1533
942
case AVAHI_RESOLVER_FOUND:
1535
944
char ip[AVAHI_ADDRESS_STR_MAX];
1536
945
avahi_address_snprint(ip, sizeof(ip), address);
1537
946
if(debug){
1538
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1539
PRIdMAX ") on port %" PRIu16 "\n", name,
1540
host_name, ip, (intmax_t)interface, port);
947
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
948
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
949
ip, (intmax_t)interface, port);
1541
950
}
1542
int ret = start_mandos_communication(ip, (in_port_t)port,
1543
interface,
1544
avahi_proto_to_af(proto),
1545
mc);
951
int ret = start_mandos_communication(ip, port, interface,
952
avahi_proto_to_af(proto));
1546
953
if(ret == 0){
1547
avahi_simple_poll_quit(simple_poll);
1548
} else {
1549
if(not add_server(ip, (in_port_t)port, interface,
1550
avahi_proto_to_af(proto),
1551
&((mandos_context*)mc)->current_server)){
1552
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1553
" list\n", name);
1554
}
954
avahi_simple_poll_quit(mc.simple_poll);
1555
955
}
1556
956
}
1557
957
}
1567
967
const char *domain,
1568
968
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1569
969
flags,
1570
void *mc){
1571
if(b == NULL){
1572
return;
1573
}
970
AVAHI_GCC_UNUSED void* userdata){
971
assert(b);
1574
972
1575
973
/* Called whenever a new services becomes available on the LAN or
1576
974
is removed from the LAN */
1583
981
default:
1584
982
case AVAHI_BROWSER_FAILURE:
1585
983
1586
fprintf_plus(stderr, "(Avahi browser) %s\n",
1587
avahi_strerror(avahi_server_errno
1588
(((mandos_context*)mc)->server)));
1589
avahi_simple_poll_quit(simple_poll);
984
fprintf(stderr, "(Avahi browser) %s\n",
985
avahi_strerror(avahi_server_errno(mc.server)));
986
avahi_simple_poll_quit(mc.simple_poll);
1590
987
return;
1591
988
1592
989
case AVAHI_BROWSER_NEW:
1595
992
the callback function is called the Avahi server will free the
1596
993
resolver for us. */
1597
994
1598
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1599
interface, protocol, name, type,
1600
domain, protocol, 0,
1601
resolve_callback, mc) == NULL)
1602
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1603
" %s\n", name,
1604
avahi_strerror(avahi_server_errno
1605
(((mandos_context*)mc)->server)));
995
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
996
name, type, domain, protocol, 0,
997
resolve_callback, NULL) == NULL)
998
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
999
name, avahi_strerror(avahi_server_errno(mc.server)));
1606
1000
break;
1607
1001
1608
1002
case AVAHI_BROWSER_REMOVE:
1611
1005
case AVAHI_BROWSER_ALL_FOR_NOW:
1612
1006
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1613
1007
if(debug){
1614
fprintf_plus(stderr, "No Mandos server found, still"
1615
" searching...\n");
1008
fprintf(stderr, "No Mandos server found, still searching...\n");
1616
1009
}
1617
1010
break;
1618
1011
}
1619
1012
}
1620
1013
1621
/* Signal handler that stops main loop after SIGTERM */
1014
/* stop main loop after sigterm has been called */
1622
1015
static void handle_sigterm(int sig){
1623
1016
if(quit_now){
1624
1017
return;
1626
1019
quit_now = 1;
1627
1020
signal_received = sig;
1628
1021
int old_errno = errno;
1629
/* set main loop to exit */
1630
if(simple_poll != NULL){
1631
avahi_simple_poll_quit(simple_poll);
1022
if(mc.simple_poll != NULL){
1023
avahi_simple_poll_quit(mc.simple_poll);
1632
1024
}
1633
1025
errno = old_errno;
1634
1026
}
1635
1027
1636
__attribute__((nonnull, warn_unused_result))
1637
bool get_flags(const char *ifname, struct ifreq *ifr){
1638
int ret;
1639
int old_errno;
1640
1641
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
if(s < 0){
1643
old_errno = errno;
1644
perror_plus("socket");
1645
errno = old_errno;
1646
return false;
1647
}
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1650
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1651
if(ret == -1){
1028
/*
1029
* This function determines if a directory entry in /sys/class/net
1030
* corresponds to an acceptable network device.
1031
* (This function is passed to scandir(3) as a filter function.)
1032
*/
1033
int good_interface(const struct dirent *if_entry){
1034
ssize_t ssret;
1035
char *flagname = NULL;
1036
if(if_entry->d_name[0] == '.'){
1037
return 0;
1038
}
1039
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1040
if_entry->d_name);
1041
if(ret < 0){
1042
perror("asprintf");
1043
return 0;
1044
}
1045
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1046
if(flags_fd == -1){
1047
perror("open");
1048
free(flagname);
1049
return 0;
1050
}
1051
free(flagname);
1052
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1053
/* read line from flags_fd */
1054
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1055
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1056
flagstring[(size_t)to_read] = '\0';
1057
if(flagstring == NULL){
1058
perror("malloc");
1059
close(flags_fd);
1060
return 0;
1061
}
1062
while(to_read > 0){
1063
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1064
(size_t)to_read));
1065
if(ssret == -1){
1066
perror("read");
1067
free(flagstring);
1068
close(flags_fd);
1069
return 0;
1070
}
1071
to_read -= ssret;
1072
if(ssret == 0){
1073
break;
1074
}
1075
}
1076
close(flags_fd);
1077
intmax_t tmpmax;
1078
char *tmp;
1079
errno = 0;
1080
tmpmax = strtoimax(flagstring, &tmp, 0);
1081
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1082
and not (isspace(*tmp)))
1083
or tmpmax != (ifreq_flags)tmpmax){
1652
1084
if(debug){
1653
old_errno = errno;
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1085
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1086
flagstring, if_entry->d_name);
1656
1087
}
1657
return false;
1088
free(flagstring);
1089
return 0;
1658
1090
}
1659
return true;
1660
}
1661
1662
__attribute__((nonnull, warn_unused_result))
1663
bool good_flags(const char *ifname, const struct ifreq *ifr){
1664
1091
free(flagstring);
1092
ifreq_flags flags = (ifreq_flags)tmpmax;
1665
1093
/* Reject the loopback device */
1666
if(ifr->ifr_flags & IFF_LOOPBACK){
1094
if(flags & IFF_LOOPBACK){
1667
1095
if(debug){
1668
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1669
ifname);
1096
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1097
if_entry->d_name);
1670
1098
}
1671
return false;
1099
return 0;
1672
1100
}
1673
1101
/* Accept point-to-point devices only if connect_to is specified */
1674
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1102
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1675
1103
if(debug){
1676
fprintf_plus(stderr, "Accepting point-to-point interface"
1677
" \"%s\"\n", ifname);
1104
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1105
if_entry->d_name);
1678
1106
}
1679
return true;
1107
return 1;
1680
1108
}
1681
1109
/* Otherwise, reject non-broadcast-capable devices */
1682
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1110
if(not (flags & IFF_BROADCAST)){
1683
1111
if(debug){
1684
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1685
" \"%s\"\n", ifname);
1112
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1113
if_entry->d_name);
1686
1114
}
1687
return false;
1115
return 0;
1688
1116
}
1689
1117
/* Reject non-ARP interfaces (including dummy interfaces) */
1690
if(ifr->ifr_flags & IFF_NOARP){
1118
if(flags & IFF_NOARP){
1691
1119
if(debug){
1692
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1693
ifname);
1120
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1121
if_entry->d_name);
1694
1122
}
1695
return false;
1123
return 0;
1696
1124
}
1697
1698
1125
/* Accept this device */
1699
1126
if(debug){
1700
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1701
}
1702
return true;
1703
}
1704
1705
/*
1706
* This function determines if a directory entry in /sys/class/net
1707
* corresponds to an acceptable network device.
1708
* (This function is passed to scandir(3) as a filter function.)
1709
*/
1710
__attribute__((nonnull, warn_unused_result))
1711
int good_interface(const struct dirent *if_entry){
1712
if(if_entry->d_name[0] == '.'){
1713
return 0;
1714
}
1715
1716
struct ifreq ifr;
1717
if(not get_flags(if_entry->d_name, &ifr)){
1718
if(debug){
1719
fprintf_plus(stderr, "Failed to get flags for interface "
1720
"\"%s\"\n", if_entry->d_name);
1721
}
1722
return 0;
1723
}
1724
1725
if(not good_flags(if_entry->d_name, &ifr)){
1726
return 0;
1127
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1128
if_entry->d_name);
1727
1129
}
1728
1130
return 1;
1729
1131
}
1730
1132
1731
/*
1732
* This function determines if a network interface is up.
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_up(const char *interface){
1736
struct ifreq ifr;
1737
if(not get_flags(interface, &ifr)){
1738
if(debug){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1741
}
1742
return false;
1743
}
1744
1745
return (bool)(ifr.ifr_flags & IFF_UP);
1746
}
1747
1748
/*
1749
* This function determines if a network interface is running
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_running(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
}
1764
1765
__attribute__((nonnull, pure, warn_unused_result))
1766
1133
int notdotentries(const struct dirent *direntry){
1767
1134
/* Skip "." and ".." */
1768
1135
if(direntry->d_name[0] == '.'
1774
1141
return 1;
1775
1142
}
1776
1143
1777
/* Is this directory entry a runnable program? */
1778
__attribute__((nonnull, warn_unused_result))
1779
int runnable_hook(const struct dirent *direntry){
1780
int ret;
1781
size_t sret;
1782
struct stat st;
1783
1784
if((direntry->d_name)[0] == '\0'){
1785
/* Empty name? */
1786
return 0;
1787
}
1788
1789
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1790
"abcdefghijklmnopqrstuvwxyz"
1791
"0123456789"
1792
"_.-");
1793
if((direntry->d_name)[sret] != '\0'){
1794
/* Contains non-allowed characters */
1795
if(debug){
1796
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1797
direntry->d_name);
1798
}
1799
return 0;
1800
}
1801
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1803
if(ret == -1){
1804
if(debug){
1805
perror_plus("Could not stat hook");
1806
}
1807
return 0;
1808
}
1809
if(not (S_ISREG(st.st_mode))){
1810
/* Not a regular file */
1811
if(debug){
1812
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1813
direntry->d_name);
1814
}
1815
return 0;
1816
}
1817
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1818
/* Not executable */
1819
if(debug){
1820
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1821
direntry->d_name);
1822
}
1823
return 0;
1824
}
1825
if(debug){
1826
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1827
direntry->d_name);
1828
}
1829
return 1;
1830
}
1831
1832
__attribute__((nonnull, warn_unused_result))
1833
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1834
mandos_context *mc){
1835
int ret;
1836
struct timespec now;
1837
struct timespec waited_time;
1838
intmax_t block_time;
1839
1840
while(true){
1841
if(mc->current_server == NULL){
1842
if(debug){
1843
fprintf_plus(stderr, "Wait until first server is found."
1844
" No timeout!\n");
1845
}
1846
ret = avahi_simple_poll_iterate(s, -1);
1847
} else {
1848
if(debug){
1849
fprintf_plus(stderr, "Check current_server if we should run"
1850
" it, or wait\n");
1851
}
1852
/* the current time */
1853
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1854
if(ret == -1){
1855
perror_plus("clock_gettime");
1856
return -1;
1857
}
1858
/* Calculating in ms how long time between now and server
1859
who we visted longest time ago. Now - last seen. */
1860
waited_time.tv_sec = (now.tv_sec
1861
- mc->current_server->last_seen.tv_sec);
1862
waited_time.tv_nsec = (now.tv_nsec
1863
- mc->current_server->last_seen.tv_nsec);
1864
/* total time is 10s/10,000ms.
1865
Converting to s from ms by dividing by 1,000,
1866
and ns to ms by dividing by 1,000,000. */
1867
block_time = ((retry_interval
1868
- ((intmax_t)waited_time.tv_sec * 1000))
1869
- ((intmax_t)waited_time.tv_nsec / 1000000));
1870
1871
if(debug){
1872
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1873
block_time);
1874
}
1875
1876
if(block_time <= 0){
1877
ret = start_mandos_communication(mc->current_server->ip,
1878
mc->current_server->port,
1879
mc->current_server->if_index,
1880
mc->current_server->af, mc);
1881
if(ret == 0){
1882
avahi_simple_poll_quit(s);
1883
return 0;
1884
}
1885
ret = clock_gettime(CLOCK_MONOTONIC,
1886
&mc->current_server->last_seen);
1887
if(ret == -1){
1888
perror_plus("clock_gettime");
1889
return -1;
1890
}
1891
mc->current_server = mc->current_server->next;
1892
block_time = 0; /* Call avahi to find new Mandos
1893
servers, but don't block */
1894
}
1895
1896
ret = avahi_simple_poll_iterate(s, (int)block_time);
1897
}
1898
if(ret != 0){
1899
if(ret > 0 or errno != EINTR){
1900
return (ret != 1) ? ret : 0;
1901
}
1902
}
1903
}
1904
}
1905
1906
__attribute__((nonnull))
1907
void run_network_hooks(const char *mode, const char *interface,
1908
const float delay){
1909
struct dirent **direntries = NULL;
1910
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
| O_CLOEXEC);
1913
if(hookdir_fd == -1){
1914
if(errno == ENOENT){
1915
if(debug){
1916
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1917
" found\n", hookdir);
1918
}
1919
} else {
1920
perror_plus("open");
1921
}
1922
return;
1923
}
1924
}
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
runnable_hook, alphasort);
1927
if(numhooks == -1){
1928
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1990
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1995
free(delaystring);
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
2064
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
2084
}
2085
2086
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2090
int ret;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2093
if(if_index == 0){
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2095
errno = old_errno;
2096
return ENXIO;
2097
}
2098
2099
if(quit_now){
2100
errno = old_errno;
2101
return EINTR;
2102
}
2103
2104
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2108
ret_errno = errno;
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
2115
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
2118
ret_errno = errno;
2119
perror_plus("socket");
2120
errno = old_errno;
2121
return ret_errno;
2122
}
2123
2124
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
2129
errno = old_errno;
2130
return EINTR;
2131
}
2132
2133
if(debug){
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2135
interface);
2136
}
2137
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
2144
2145
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
2157
}
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2161
#ifdef __linux__
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2166
}
2167
}
2168
#endif /* __linux__ */
2169
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
2179
2180
/* Close the socket */
2181
ret = close(sd);
2182
if(ret == -1){
2183
perror_plus("close");
2184
}
2185
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
errno = old_errno;
2190
return ioctl_errno;
2191
}
2192
} else if(debug){
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2194
interface);
2195
}
2196
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i = 0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2201
break;
2202
}
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2207
}
2208
}
2209
2210
errno = old_errno;
2211
return 0;
2212
}
2213
2214
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2219
if(if_index == 0){
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2221
errno = old_errno;
2222
return ENXIO;
2223
}
2224
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2228
ret_errno = errno;
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
return ret_errno;
2233
}
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
2238
ret_errno = errno;
2239
perror_plus("socket");
2240
errno = old_errno;
2241
return ret_errno;
2242
}
2243
2244
if(debug){
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2246
interface);
2247
}
2248
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
2268
2269
/* Close the socket */
2270
int ret = close(sd);
2271
if(ret == -1){
2272
perror_plus("close");
2273
}
2274
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
errno = old_errno;
2279
return ioctl_errno;
2280
}
2281
} else if(debug){
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2283
interface);
2284
}
2285
2286
errno = old_errno;
2287
return 0;
2288
}
2289
2290
1144
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
2296
1145
AvahiSServiceBrowser *sb = NULL;
2297
error_t ret_errno;
1146
int error;
2298
1147
int ret;
2299
1148
intmax_t tmpmax;
2300
1149
char *tmp;
2301
1150
int exitcode = EXIT_SUCCESS;
2302
char *interfaces_to_take_down = NULL;
2303
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1151
const char *interface = "";
1152
struct ifreq network;
1153
int sd = -1;
1154
bool take_down_interface = false;
1155
uid_t uid;
1156
gid_t gid;
1157
char tempdir[] = "/tmp/mandosXXXXXX";
1158
bool tempdir_created = false;
2307
1159
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1160
const char *seckey = PATHDIR "/" SECKEY;
2309
1161
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
2312
1162
2313
1163
bool gnutls_initialized = false;
2314
1164
bool gpgme_initialized = false;
2315
1165
float delay = 2.5f;
2316
double retry_interval = 10; /* 10s between trying a server and
2317
retrying the same server again */
2318
1166
2319
1167
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2320
1168
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2326
1174
errno = 0;
2327
1175
ret = setgid(gid);
2328
1176
if(ret == -1){
2329
perror_plus("setgid");
1177
perror("setgid");
2330
1178
}
2331
1179
2332
1180
/* Lower user privileges (temporarily) */
2333
1181
errno = 0;
2334
1182
ret = seteuid(uid);
2335
1183
if(ret == -1){
2336
perror_plus("seteuid");
1184
perror("seteuid");
2337
1185
}
2338
1186
2339
1187
if(quit_now){
2366
1214
.doc = "Bit length of the prime number used in the"
2367
1215
" Diffie-Hellman key exchange",
2368
1216
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
2374
1217
{ .name = "priority", .key = 130,
2375
1218
.arg = "STRING",
2376
1219
.doc = "GnuTLS priority string for the TLS handshake",
2379
1222
.arg = "SECONDS",
2380
1223
.doc = "Maximum delay to wait for interface startup",
2381
1224
.group = 2 },
2382
{ .name = "retry", .key = 132,
2383
.arg = "SECONDS",
2384
.doc = "Retry interval used when denied by the Mandos server",
2385
.group = 2 },
2386
{ .name = "network-hook-dir", .key = 133,
2387
.arg = "DIR",
2388
.doc = "Directory where network hooks are located",
2389
.group = 2 },
2390
1225
/*
2391
1226
* These reproduce what we would get without ARGP_NO_HELP
2392
1227
*/
2410
1245
connect_to = arg;
2411
1246
break;
2412
1247
case 'i': /* --interface */
2413
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2414
arg, (int)',');
2415
if(ret_errno != 0){
2416
argp_error(state, "%s", strerror(ret_errno));
2417
}
1248
interface = arg;
2418
1249
break;
2419
1250
case 's': /* --seckey */
2420
1251
seckey = arg;
2431
1262
}
2432
1263
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
1264
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
1265
case 130: /* --priority */
2438
1266
mc.priority = arg;
2439
1267
break;
2443
1271
if(errno != 0 or tmp == arg or *tmp != '\0'){
2444
1272
argp_error(state, "Bad delay");
2445
1273
}
2446
case 132: /* --retry */
2447
errno = 0;
2448
retry_interval = strtod(arg, &tmp);
2449
if(errno != 0 or tmp == arg or *tmp != '\0'
2450
or (retry_interval * 1000) > INT_MAX
2451
or retry_interval < 0){
2452
argp_error(state, "Bad retry interval");
2453
}
2454
break;
2455
case 133: /* --network-hook-dir */
2456
hookdir = arg;
2457
1274
break;
2458
1275
/*
2459
1276
* These reproduce what we would get without ARGP_NO_HELP
2466
1283
argp_state_help(state, state->out_stream,
2467
1284
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2468
1285
case 'V': /* --version */
2469
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1286
fprintf(state->out_stream, "%s\n", argp_program_version);
2470
1287
exit(argp_err_exit_status);
2471
1288
break;
2472
1289
default:
2479
1296
.args_doc = "",
2480
1297
.doc = "Mandos client -- Get and decrypt"
2481
1298
" passwords from a Mandos server" };
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
1299
ret = argp_parse(&argp, argc, argv,
1300
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1301
switch(ret){
2485
1302
case 0:
2486
1303
break;
2487
1304
case ENOMEM:
2488
1305
default:
2489
errno = ret_errno;
2490
perror_plus("argp_parse");
1306
errno = ret;
1307
perror("argp_parse");
2491
1308
exitcode = EX_OSERR;
2492
1309
goto end;
2493
1310
case EINVAL:
2496
1313
}
2497
1314
}
2498
1315
2499
{
2500
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
2502
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2507
perror_plus("Failed to raise privileges");
2508
} else {
2509
struct stat st;
2510
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2512
int seckey_fd = open(seckey, O_RDONLY);
2513
if(seckey_fd == -1){
2514
perror_plus("open");
2515
} else {
2516
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2517
if(ret == -1){
2518
perror_plus("fstat");
2519
} else {
2520
if(S_ISREG(st.st_mode)
2521
and st.st_uid == 0 and st.st_gid == 0){
2522
ret = fchown(seckey_fd, uid, gid);
2523
if(ret == -1){
2524
perror_plus("fchown");
2525
}
2526
}
2527
}
2528
close(seckey_fd);
2529
}
2530
}
2531
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
int pubkey_fd = open(pubkey, O_RDONLY);
2534
if(pubkey_fd == -1){
2535
perror_plus("open");
2536
} else {
2537
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2538
if(ret == -1){
2539
perror_plus("fstat");
2540
} else {
2541
if(S_ISREG(st.st_mode)
2542
and st.st_uid == 0 and st.st_gid == 0){
2543
ret = fchown(pubkey_fd, uid, gid);
2544
if(ret == -1){
2545
perror_plus("fchown");
2546
}
2547
}
2548
}
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
2575
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2579
perror_plus("Failed to lower privileges");
2580
}
2581
}
2582
}
2583
2584
/* Remove invalid interface names (except "none") */
2585
{
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
interface))){
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2594
}
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2596
interface = NULL;
2597
}
2598
}
2599
}
2600
2601
/* Run network hooks */
2602
{
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2605
if(interfaces_hooks == NULL){
2606
perror_plus("malloc");
2607
goto end;
2608
}
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
2614
}
2615
2616
1316
if(not debug){
2617
1317
avahi_set_log_function(empty_log);
2618
1318
}
1319
1320
if(interface[0] == '\0'){
1321
struct dirent **direntries;
1322
ret = scandir(sys_class_net, &direntries, good_interface,
1323
alphasort);
1324
if(ret >= 1){
1325
/* Pick the first good interface */
1326
interface = strdup(direntries[0]->d_name);
1327
if(debug){
1328
fprintf(stderr, "Using interface \"%s\"\n", interface);
1329
}
1330
if(interface == NULL){
1331
perror("malloc");
1332
free(direntries);
1333
exitcode = EXIT_FAILURE;
1334
goto end;
1335
}
1336
free(direntries);
1337
} else {
1338
free(direntries);
1339
fprintf(stderr, "Could not find a network interface\n");
1340
exitcode = EXIT_FAILURE;
1341
goto end;
1342
}
1343
}
2619
1344
2620
1345
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2621
1346
from the signal handler */
2622
1347
/* Initialize the pseudo-RNG for Avahi */
2623
1348
srand((unsigned int) time(NULL));
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
2626
fprintf_plus(stderr,
2627
"Avahi: Failed to create simple poll object.\n");
1349
mc.simple_poll = avahi_simple_poll_new();
1350
if(mc.simple_poll == NULL){
1351
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2628
1352
exitcode = EX_UNAVAILABLE;
2629
1353
goto end;
2630
1354
}
2632
1356
sigemptyset(&sigterm_action.sa_mask);
2633
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2634
1358
if(ret == -1){
2635
perror_plus("sigaddset");
1359
perror("sigaddset");
2636
1360
exitcode = EX_OSERR;
2637
1361
goto end;
2638
1362
}
2639
1363
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2640
1364
if(ret == -1){
2641
perror_plus("sigaddset");
1365
perror("sigaddset");
2642
1366
exitcode = EX_OSERR;
2643
1367
goto end;
2644
1368
}
2645
1369
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2646
1370
if(ret == -1){
2647
perror_plus("sigaddset");
1371
perror("sigaddset");
2648
1372
exitcode = EX_OSERR;
2649
1373
goto end;
2650
1374
}
2654
1378
*/
2655
1379
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2656
1380
if(ret == -1){
2657
perror_plus("sigaction");
1381
perror("sigaction");
2658
1382
return EX_OSERR;
2659
1383
}
2660
1384
if(old_sigterm_action.sa_handler != SIG_IGN){
2661
1385
ret = sigaction(SIGINT, &sigterm_action, NULL);
2662
1386
if(ret == -1){
2663
perror_plus("sigaction");
1387
perror("sigaction");
2664
1388
exitcode = EX_OSERR;
2665
1389
goto end;
2666
1390
}
2667
1391
}
2668
1392
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2669
1393
if(ret == -1){
2670
perror_plus("sigaction");
1394
perror("sigaction");
2671
1395
return EX_OSERR;
2672
1396
}
2673
1397
if(old_sigterm_action.sa_handler != SIG_IGN){
2674
1398
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2675
1399
if(ret == -1){
2676
perror_plus("sigaction");
1400
perror("sigaction");
2677
1401
exitcode = EX_OSERR;
2678
1402
goto end;
2679
1403
}
2680
1404
}
2681
1405
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2682
1406
if(ret == -1){
2683
perror_plus("sigaction");
1407
perror("sigaction");
2684
1408
return EX_OSERR;
2685
1409
}
2686
1410
if(old_sigterm_action.sa_handler != SIG_IGN){
2687
1411
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2688
1412
if(ret == -1){
2689
perror_plus("sigaction");
1413
perror("sigaction");
2690
1414
exitcode = EX_OSERR;
2691
1415
goto end;
2692
1416
}
2693
1417
}
2694
1418
2695
/* If no interfaces were specified, make a list */
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2698
/* Look for any good interfaces */
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2700
alphasort);
2701
if(ret >= 1){
2702
/* Add all found interfaces to interfaces list */
2703
for(int i = 0; i < ret; ++i){
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
direntries[i]->d_name);
2706
if(ret_errno != 0){
2707
errno = ret_errno;
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2710
continue;
2711
}
2712
if(debug){
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
direntries[i]->d_name);
2715
}
2716
free(direntries[i]);
2717
}
2718
free(direntries);
1419
/* If the interface is down, bring it up */
1420
if(strcmp(interface, "none") != 0){
1421
if_index = (AvahiIfIndex) if_nametoindex(interface);
1422
if(if_index == 0){
1423
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1424
exitcode = EX_UNAVAILABLE;
1425
goto end;
1426
}
1427
1428
if(quit_now){
1429
goto end;
1430
}
1431
1432
/* Re-raise priviliges */
1433
errno = 0;
1434
ret = seteuid(0);
1435
if(ret == -1){
1436
perror("seteuid");
1437
}
1438
1439
#ifdef __linux__
1440
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1441
messages about the network interface to mess up the prompt */
1442
ret = klogctl(8, NULL, 5);
1443
bool restore_loglevel = true;
1444
if(ret == -1){
1445
restore_loglevel = false;
1446
perror("klogctl");
1447
}
1448
#endif /* __linux__ */
1449
1450
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1451
if(sd < 0){
1452
perror("socket");
1453
exitcode = EX_OSERR;
1454
#ifdef __linux__
1455
if(restore_loglevel){
1456
ret = klogctl(7, NULL, 0);
1457
if(ret == -1){
1458
perror("klogctl");
1459
}
1460
}
1461
#endif /* __linux__ */
1462
/* Lower privileges */
1463
errno = 0;
1464
ret = seteuid(uid);
1465
if(ret == -1){
1466
perror("seteuid");
1467
}
1468
goto end;
1469
}
1470
strcpy(network.ifr_name, interface);
1471
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1472
if(ret == -1){
1473
perror("ioctl SIOCGIFFLAGS");
1474
#ifdef __linux__
1475
if(restore_loglevel){
1476
ret = klogctl(7, NULL, 0);
1477
if(ret == -1){
1478
perror("klogctl");
1479
}
1480
}
1481
#endif /* __linux__ */
1482
exitcode = EX_OSERR;
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
if((network.ifr_flags & IFF_UP) == 0){
1492
network.ifr_flags |= IFF_UP;
1493
take_down_interface = true;
1494
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1495
if(ret == -1){
1496
take_down_interface = false;
1497
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1498
exitcode = EX_OSERR;
1499
#ifdef __linux__
1500
if(restore_loglevel){
1501
ret = klogctl(7, NULL, 0);
1502
if(ret == -1){
1503
perror("klogctl");
1504
}
1505
}
1506
#endif /* __linux__ */
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror("seteuid");
1512
}
1513
goto end;
1514
}
1515
}
1516
/* sleep checking until interface is running */
1517
for(int i=0; i < delay * 4; i++){
1518
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1519
if(ret == -1){
1520
perror("ioctl SIOCGIFFLAGS");
1521
} else if(network.ifr_flags & IFF_RUNNING){
1522
break;
1523
}
1524
struct timespec sleeptime = { .tv_nsec = 250000000 };
1525
ret = nanosleep(&sleeptime, NULL);
1526
if(ret == -1 and errno != EINTR){
1527
perror("nanosleep");
1528
}
1529
}
1530
if(not take_down_interface){
1531
/* We won't need the socket anymore */
1532
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1533
if(ret == -1){
1534
perror("close");
1535
}
1536
}
1537
#ifdef __linux__
1538
if(restore_loglevel){
1539
/* Restores kernel loglevel to default */
1540
ret = klogctl(7, NULL, 0);
1541
if(ret == -1){
1542
perror("klogctl");
1543
}
1544
}
1545
#endif /* __linux__ */
1546
/* Lower privileges */
1547
errno = 0;
1548
if(take_down_interface){
1549
/* Lower privileges */
1550
ret = seteuid(uid);
1551
if(ret == -1){
1552
perror("seteuid");
1553
}
2719
1554
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2724
exitcode = EXIT_FAILURE;
2725
goto end;
2726
}
2727
}
2728
2729
/* Bring up interfaces which are down, and remove any "none"s */
2730
{
2731
char *interface = NULL;
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2733
interface))){
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
interface);
2739
interface = NULL;
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2744
interface);
2745
interface = NULL;
2746
}
2747
}
2748
break;
2749
}
2750
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2752
if(not interface_was_up){
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2756
} else {
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2761
perror_plus("argz_add");
2762
}
2763
}
2764
}
2765
}
2766
if(debug and (interfaces_to_take_down == NULL)){
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2768
}
2769
}
2770
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
if(debug){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
mc.interfaces);
2776
}
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1555
/* Lower privileges permanently */
1556
ret = setuid(uid);
1557
if(ret == -1){
1558
perror("setuid");
1559
}
1560
}
2778
1561
}
2779
1562
2780
1563
if(quit_now){
2781
1564
goto end;
2782
1565
}
2783
1566
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1567
ret = init_gnutls_global(pubkey, seckey);
2785
1568
if(ret == -1){
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
1569
fprintf(stderr, "init_gnutls_global failed\n");
2787
1570
exitcode = EX_UNAVAILABLE;
2788
1571
goto end;
2789
1572
} else {
2794
1577
goto end;
2795
1578
}
2796
1579
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
2807
perror_plus("mkdtemp");
1580
if(mkdtemp(tempdir) == NULL){
1581
perror("mkdtemp");
2808
1582
goto end;
2809
1583
}
1584
tempdir_created = true;
2810
1585
2811
1586
if(quit_now){
2812
1587
goto end;
2813
1588
}
2814
1589
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2816
fprintf_plus(stderr, "init_gpgme failed\n");
1590
if(not init_gpgme(pubkey, seckey, tempdir)){
1591
fprintf(stderr, "init_gpgme failed\n");
2817
1592
exitcode = EX_UNAVAILABLE;
2818
1593
goto end;
2819
1594
} else {
2828
1603
/* Connect directly, do not use Zeroconf */
2829
1604
/* (Mainly meant for debugging) */
2830
1605
char *address = strrchr(connect_to, ':');
2831
2832
1606
if(address == NULL){
2833
fprintf_plus(stderr, "No colon in address\n");
1607
fprintf(stderr, "No colon in address\n");
2834
1608
exitcode = EX_USAGE;
2835
1609
goto end;
2836
1610
}
2839
1613
goto end;
2840
1614
}
2841
1615
2842
in_port_t port;
1616
uint16_t port;
2843
1617
errno = 0;
2844
1618
tmpmax = strtoimax(address+1, &tmp, 10);
2845
1619
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2846
or tmpmax != (in_port_t)tmpmax){
2847
fprintf_plus(stderr, "Bad port number\n");
1620
or tmpmax != (uint16_t)tmpmax){
1621
fprintf(stderr, "Bad port number\n");
2848
1622
exitcode = EX_USAGE;
2849
1623
goto end;
2850
1624
}
2851
1625
2852
1626
if(quit_now){
2853
1627
goto end;
2854
1628
}
2855
1629
2856
port = (in_port_t)tmpmax;
1630
port = (uint16_t)tmpmax;
2857
1631
*address = '\0';
1632
address = connect_to;
2858
1633
/* Colon in address indicates IPv6 */
2859
1634
int af;
2860
if(strchr(connect_to, ':') != NULL){
1635
if(strchr(address, ':') != NULL){
2861
1636
af = AF_INET6;
2862
/* Accept [] around IPv6 address - see RFC 5952 */
2863
if(connect_to[0] == '[' and address[-1] == ']')
2864
{
2865
connect_to++;
2866
address[-1] = '\0';
2867
}
2868
1637
} else {
2869
1638
af = AF_INET;
2870
1639
}
2871
address = connect_to;
2872
1640
2873
1641
if(quit_now){
2874
1642
goto end;
2875
1643
}
2876
1644
2877
1645
while(not quit_now){
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
1646
ret = start_mandos_communication(address, port, if_index, af);
2880
1647
if(quit_now or ret == 0){
2881
1648
break;
2882
1649
}
2883
if(debug){
2884
fprintf_plus(stderr, "Retrying in %d seconds\n",
2885
(int)retry_interval);
2886
}
2887
sleep((unsigned int)retry_interval);
2888
}
2889
2890
if(not quit_now){
1650
sleep(15);
1651
};
1652
1653
if (not quit_now){
2891
1654
exitcode = EXIT_SUCCESS;
2892
1655
}
2893
1656
2894
1657
goto end;
2895
1658
}
2896
1659
2908
1671
config.publish_domain = 0;
2909
1672
2910
1673
/* Allocate a new server */
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
1674
mc.server = avahi_server_new(avahi_simple_poll_get
1675
(mc.simple_poll), &config, NULL,
1676
NULL, &error);
2913
1677
2914
1678
/* Free the Avahi configuration data */
2915
1679
avahi_server_config_free(&config);
2917
1681
2918
1682
/* Check if creating the Avahi server object succeeded */
2919
1683
if(mc.server == NULL){
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
1684
fprintf(stderr, "Failed to create Avahi server: %s\n",
1685
avahi_strerror(error));
2922
1686
exitcode = EX_UNAVAILABLE;
2923
1687
goto end;
2924
1688
}
2930
1694
/* Create the Avahi service browser */
2931
1695
sb = avahi_s_service_browser_new(mc.server, if_index,
2932
1696
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
1697
NULL, 0, browse_callback, NULL);
2935
1698
if(sb == NULL){
2936
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2937
avahi_strerror(avahi_server_errno(mc.server)));
1699
fprintf(stderr, "Failed to create service browser: %s\n",
1700
avahi_strerror(avahi_server_errno(mc.server)));
2938
1701
exitcode = EX_UNAVAILABLE;
2939
1702
goto end;
2940
1703
}
2946
1709
/* Run the main loop */
2947
1710
2948
1711
if(debug){
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
1712
fprintf(stderr, "Starting Avahi loop search\n");
2950
1713
}
2951
1714
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2954
if(debug){
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
(ret == 0) ? "successfully" : "with error");
2957
}
1715
avahi_simple_poll_loop(mc.simple_poll);
2958
1716
2959
1717
end:
2960
1718
2961
1719
if(debug){
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
1720
fprintf(stderr, "%s exiting\n", argv[0]);
2969
1721
}
2970
1722
2971
1723
/* Cleanup things */
2972
free(mc.interfaces);
2973
2974
1724
if(sb != NULL)
2975
1725
avahi_s_service_browser_free(sb);
2976
1726
2977
1727
if(mc.server != NULL)
2978
1728
avahi_server_free(mc.server);
2979
1729
2980
if(simple_poll != NULL)
2981
avahi_simple_poll_free(simple_poll);
1730
if(mc.simple_poll != NULL)
1731
avahi_simple_poll_free(mc.simple_poll);
2982
1732
2983
1733
if(gnutls_initialized){
2984
1734
gnutls_certificate_free_credentials(mc.cred);
1735
gnutls_global_deinit();
2985
1736
gnutls_dh_params_deinit(mc.dh_params);
2986
1737
}
2987
1738
2989
1740
gpgme_release(mc.ctx);
2990
1741
}
2991
1742
2992
/* Cleans up the circular linked list of Mandos servers the client
2993
has seen */
2994
if(mc.current_server != NULL){
2995
mc.current_server->prev->next = NULL;
2996
while(mc.current_server != NULL){
2997
server *next = mc.current_server->next;
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic push
3000
#pragma GCC diagnostic ignored "-Wcast-qual"
3001
#endif
3002
free((char *)(mc.current_server->ip));
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic pop
3005
#endif
3006
free(mc.current_server);
3007
mc.current_server = next;
3008
}
3009
}
3010
3011
/* Re-raise privileges */
3012
{
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
3016
perror_plus("Failed to raise privileges");
3017
} else {
3018
3019
/* Run network hooks */
3020
run_network_hooks("stop", interfaces_hooks != NULL ?
3021
interfaces_hooks : "", delay);
3022
3023
/* Take down the network interfaces which were brought up */
3024
{
3025
char *interface = NULL;
3026
while((interface = argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to take down interface");
3033
}
3034
}
3035
if(debug and (interfaces_to_take_down == NULL)){
3036
fprintf_plus(stderr, "No interfaces needed to be taken"
3037
" down\n");
3038
}
3039
}
3040
}
3041
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
3045
perror_plus("Failed to lower privileges permanently");
3046
}
3047
}
3048
3049
free(interfaces_to_take_down);
3050
free(interfaces_hooks);
3051
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
3054
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
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);
1743
/* Take down the network interface */
1744
if(take_down_interface){
1745
/* Re-raise priviliges */
1746
errno = 0;
1747
ret = seteuid(0);
1748
if(ret == -1){
1749
perror("seteuid");
1750
}
1751
if(geteuid() == 0){
1752
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1753
if(ret == -1){
1754
perror("ioctl SIOCGIFFLAGS");
1755
} else if(network.ifr_flags & IFF_UP) {
1756
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1757
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1758
if(ret == -1){
1759
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1760
}
1761
}
1762
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1763
if(ret == -1){
1764
perror("close");
1765
}
1766
/* Lower privileges permanently */
1767
errno = 0;
1768
ret = setuid(uid);
1769
if(ret == -1){
1770
perror("setuid");
1771
}
1772
}
3106
1773
}
3107
1774
3108
1775
/* Removes the GPGME temp directory and all files inside */
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
1776
if(tempdir_created){
1777
struct dirent **direntries = NULL;
1778
struct dirent *direntry = NULL;
1779
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1780
if (ret > 0){
1781
for(int i = 0; i < ret; i++){
1782
direntry = direntries[i];
1783
char *fullname = NULL;
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
1785
direntry->d_name);
1786
if(ret < 0){
1787
perror("asprintf");
1788
continue;
1789
}
1790
ret = remove(fullname);
1791
if(ret == -1){
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1793
strerror(errno));
1794
}
1795
free(fullname);
1796
}
1797
}
1798
1799
/* need to be cleaned even if ret == 0 because man page dont specify */
1800
free(direntries);
1801
if (ret == -1){
1802
perror("scandir");
1803
}
1804
ret = rmdir(tempdir);
1805
if(ret == -1 and errno != ENOENT){
1806
perror("rmdir");
1807
}
3111
1808
}
3112
1809
3113
1810
if(quit_now){
3117
1814
&old_sigterm_action,
3118
1815
NULL));
3119
1816
if(ret == -1){
3120
perror_plus("sigaction");
1817
perror("sigaction");
3121
1818
}
3122
1819
do {
3123
1820
ret = raise(signal_received);
3124
1821
} while(ret != 0 and errno == EINTR);
3125
1822
if(ret != 0){
3126
perror_plus("raise");
1823
perror("raise");
3127
1824
abort();
3128
1825
}
3129
1826
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0