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- Committer: Teddy Hogeborn
- Date: 2014-07-13 21:02:53 UTC
- mto: This revision was merged to the branch mainline in revision 711.
- Revision ID: teddy@recompile.se-20140713210253-ftnydds0bnvbzxaa
Tags: version-1.6.6-1
* Makefile (version): Changed to "1.6.6".
* NEWS (Version 1.6.6): New entry.
* debian/changelog (1.6.6-1): - '' -
* NEWS (Version 1.6.6): New entry.
* debian/changelog (1.6.6-1): - '' -
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.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
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
82
84
#include <signal.h> /* sigemptyset(), sigaddset(),
83
85
sigaction(), SIGTERM, sig_atomic_t,
84
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
85
98
86
99
#ifdef __linux__
87
100
#include <sys/klog.h> /* klogctl() */
105
118
init_gnutls_session(),
106
119
GNUTLS_* */
107
120
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
110
123
111
124
/* GPGME */
112
125
#include <gpgme.h> /* All GPGME types, constants and
120
133
#define PATHDIR "/conf/conf.d/mandos"
121
134
#define SECKEY "seckey.txt"
122
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
137
124
138
bool debug = false;
125
139
static const char mandos_protocol_version[] = "1";
126
140
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
128
142
static const char sys_class_net[] = "/sys/class/net";
129
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
130
159
131
160
/* Used for passing in values through the Avahi callback functions */
132
161
typedef struct {
133
AvahiSimplePoll *simple_poll;
134
162
AvahiServer *server;
135
163
gnutls_certificate_credentials_t cred;
136
164
unsigned int dh_bits;
137
165
gnutls_dh_params_t dh_params;
138
166
const char *priority;
139
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
140
171
} mandos_context;
141
172
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
146
175
147
176
sig_atomic_t quit_now = 0;
148
177
int signal_received = 0;
149
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
150
198
/*
151
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
200
* bytes. "buffer_capacity" is how much is currently allocated,
153
201
* "buffer_length" is how much is already used.
154
202
*/
203
__attribute__((nonnull, warn_unused_result))
155
204
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
205
size_t buffer_capacity){
157
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
160
213
return 0;
161
214
}
215
*buffer = new_buf;
162
216
buffer_capacity += BUFFER_SIZE;
163
217
}
164
218
return buffer_capacity;
165
219
}
166
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
free(new_server->ip);
244
free(new_server);
245
return false;
246
}
247
/* Special case of first server */
248
if(*current_server == NULL){
249
new_server->next = new_server;
250
new_server->prev = new_server;
251
*current_server = new_server;
252
} else {
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
256
new_server->prev->next = new_server;
257
(*current_server)->prev = new_server;
258
}
259
return true;
260
}
261
167
262
/*
168
263
* Initialize GPGME.
169
264
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
269
mandos_context *mc){
172
270
gpgme_error_t rc;
173
271
gpgme_engine_info_t engine_info;
174
272
175
176
273
/*
177
274
* Helper function to insert pub and seckey to the engine keyring.
178
275
*/
179
bool import_key(const char *filename){
276
bool import_key(const char * const filename){
180
277
int ret;
181
278
int fd;
182
279
gpgme_data_t pgp_data;
183
280
184
281
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
282
if(fd == -1){
186
perror("open");
283
perror_plus("open");
187
284
return false;
188
285
}
189
286
190
287
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
288
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
194
291
return false;
195
292
}
196
293
197
rc = gpgme_op_import(mc.ctx, pgp_data);
294
rc = gpgme_op_import(mc->ctx, pgp_data);
198
295
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
201
298
return false;
202
299
}
203
300
204
301
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
302
if(ret == -1){
206
perror("close");
303
perror_plus("close");
207
304
}
208
305
gpgme_data_release(pgp_data);
209
306
return true;
210
307
}
211
308
212
309
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
310
fprintf_plus(stderr, "Initializing GPGME\n");
214
311
}
215
312
216
313
/* Init GPGME */
217
314
gpgme_check_version(NULL);
218
315
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
316
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
317
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
318
gpgme_strsource(rc), gpgme_strerror(rc));
222
319
return false;
223
320
}
224
321
225
/* Set GPGME home directory for the OpenPGP engine only */
322
/* Set GPGME home directory for the OpenPGP engine only */
226
323
rc = gpgme_get_engine_info(&engine_info);
227
324
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
325
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
326
gpgme_strsource(rc), gpgme_strerror(rc));
230
327
return false;
231
328
}
232
329
while(engine_info != NULL){
238
335
engine_info = engine_info->next;
239
336
}
240
337
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
338
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
339
tempdir);
242
340
return false;
243
341
}
244
342
245
343
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
344
rc = gpgme_new(&(mc->ctx));
247
345
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
346
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
348
gpgme_strerror(rc));
250
349
return false;
251
350
}
252
351
261
360
* Decrypt OpenPGP data.
262
361
* Returns -1 on error
263
362
*/
363
__attribute__((nonnull, warn_unused_result))
264
364
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
365
size_t crypto_size,
266
char **plaintext){
366
char **plaintext,
367
mandos_context *mc){
267
368
gpgme_data_t dh_crypto, dh_plain;
268
369
gpgme_error_t rc;
269
370
ssize_t ret;
271
372
ssize_t plaintext_length = 0;
272
373
273
374
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
375
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
376
}
276
377
277
378
/* Create new GPGME data buffer from memory cryptotext */
278
379
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
380
0);
280
381
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
283
384
return -1;
284
385
}
285
386
286
387
/* Create new empty GPGME data buffer for the plaintext */
287
388
rc = gpgme_data_new(&dh_plain);
288
389
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
392
gpgme_strsource(rc), gpgme_strerror(rc));
291
393
gpgme_data_release(dh_crypto);
292
394
return -1;
293
395
}
294
396
295
397
/* Decrypt data from the cryptotext data buffer to the plaintext
296
398
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
400
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
401
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
gpgme_strsource(rc), gpgme_strerror(rc));
301
403
plaintext_length = -1;
302
404
if(debug){
303
405
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
406
result = gpgme_op_decrypt_result(mc->ctx);
305
407
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
408
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
409
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
result->wrong_key_usage);
312
414
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
415
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
416
}
315
417
gpgme_recipient_t recipient;
316
418
recipient = result->recipients;
317
419
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
420
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
424
fprintf_plus(stderr, "Secret key available: %s\n",
425
recipient->status == GPG_ERR_NO_SECKEY
426
? "No" : "Yes");
324
427
recipient = recipient->next;
325
428
}
326
429
}
329
432
}
330
433
331
434
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
435
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
436
}
334
437
335
438
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
439
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
440
perror_plus("gpgme_data_seek");
338
441
plaintext_length = -1;
339
442
goto decrypt_end;
340
443
}
342
445
*plaintext = NULL;
343
446
while(true){
344
447
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
448
(size_t)plaintext_length,
449
plaintext_capacity);
347
450
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
451
perror_plus("incbuffer");
452
plaintext_length = -1;
453
goto decrypt_end;
351
454
}
352
455
353
456
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
461
break;
359
462
}
360
463
if(ret < 0){
361
perror("gpgme_data_read");
464
perror_plus("gpgme_data_read");
362
465
plaintext_length = -1;
363
466
goto decrypt_end;
364
467
}
366
469
}
367
470
368
471
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
472
fprintf_plus(stderr, "Decrypted password is: ");
370
473
for(ssize_t i = 0; i < plaintext_length; i++){
371
474
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
475
}
383
486
return plaintext_length;
384
487
}
385
488
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
489
__attribute__((warn_unused_result))
490
static const char *safer_gnutls_strerror(int value){
491
const char *ret = gnutls_strerror(value);
389
492
if(ret == NULL)
390
493
ret = "(unknown)";
391
494
return ret;
392
495
}
393
496
394
497
/* GnuTLS log function callback */
498
__attribute__((nonnull))
395
499
static void debuggnutls(__attribute__((unused)) int level,
396
500
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
501
fprintf_plus(stderr, "GnuTLS: %s", string);
398
502
}
399
503
504
__attribute__((nonnull, warn_unused_result))
400
505
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
506
const char *seckeyfilename,
507
mandos_context *mc){
402
508
int ret;
403
509
404
510
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
511
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
512
}
407
513
408
514
ret = gnutls_global_init();
409
515
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
516
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
517
safer_gnutls_strerror(ret));
412
518
return -1;
413
519
}
414
520
421
527
}
422
528
423
529
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
531
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
safer_gnutls_strerror(ret));
431
534
gnutls_global_deinit();
432
535
return -1;
433
536
}
434
537
435
538
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
539
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
540
" secret key %s as GnuTLS credentials\n",
541
pubkeyfilename,
542
seckeyfilename);
439
543
}
440
544
441
545
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
546
(mc->cred, pubkeyfilename, seckeyfilename,
443
547
GNUTLS_OPENPGP_FMT_BASE64);
444
548
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
549
fprintf_plus(stderr,
550
"Error[%d] while reading the OpenPGP key pair ('%s',"
551
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
552
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
553
safer_gnutls_strerror(ret));
450
554
goto globalfail;
451
555
}
452
556
453
557
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
558
ret = gnutls_dh_params_init(&mc->dh_params);
455
559
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
560
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
" initialization: %s\n",
562
safer_gnutls_strerror(ret));
458
563
goto globalfail;
459
564
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
461
566
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
464
569
goto globalfail;
465
570
}
466
571
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
573
469
574
return 0;
470
575
471
576
globalfail:
472
577
473
gnutls_certificate_free_credentials(mc.cred);
578
gnutls_certificate_free_credentials(mc->cred);
474
579
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
580
gnutls_dh_params_deinit(mc->dh_params);
476
581
return -1;
477
582
}
478
583
479
static int init_gnutls_session(gnutls_session_t *session){
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
586
mandos_context *mc){
480
587
int ret;
481
588
/* GnuTLS session creation */
482
589
do {
486
593
}
487
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
595
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
596
fprintf_plus(stderr,
597
"Error in GnuTLS session initialization: %s\n",
598
safer_gnutls_strerror(ret));
491
599
}
492
600
493
601
{
494
602
const char *err;
495
603
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
604
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
605
if(quit_now){
498
606
gnutls_deinit(*session);
499
607
return -1;
500
608
}
501
609
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
610
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
611
fprintf_plus(stderr, "Syntax error at: %s\n", err);
612
fprintf_plus(stderr, "GnuTLS error: %s\n",
613
safer_gnutls_strerror(ret));
506
614
gnutls_deinit(*session);
507
615
return -1;
508
616
}
510
618
511
619
do {
512
620
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
621
mc->cred);
514
622
if(quit_now){
515
623
gnutls_deinit(*session);
516
624
return -1;
517
625
}
518
626
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
627
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
628
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
629
safer_gnutls_strerror(ret));
522
630
gnutls_deinit(*session);
523
631
return -1;
524
632
}
526
634
/* ignore client certificate if any. */
527
635
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
636
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
530
638
531
639
return 0;
532
640
}
536
644
__attribute__((unused)) const char *txt){}
537
645
538
646
/* Called when a Mandos server is found */
539
static int start_mandos_communication(const char *ip, uint16_t port,
647
__attribute__((nonnull, warn_unused_result))
648
static int start_mandos_communication(const char *ip, in_port_t port,
540
649
AvahiIfIndex if_index,
541
int af){
650
int af, mandos_context *mc){
542
651
int ret, tcp_sd = -1;
543
652
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
653
struct sockaddr_storage to;
548
654
char *buffer = NULL;
549
655
char *decrypted_buffer = NULL;
550
656
size_t buffer_length = 0;
554
660
gnutls_session_t session;
555
661
int pf; /* Protocol family */
556
662
663
errno = 0;
664
557
665
if(quit_now){
666
errno = EINTR;
558
667
return -1;
559
668
}
560
669
566
675
pf = PF_INET;
567
676
break;
568
677
default:
569
fprintf(stderr, "Bad address family: %d\n", af);
678
fprintf_plus(stderr, "Bad address family: %d\n", af);
679
errno = EINVAL;
570
680
return -1;
571
681
}
572
682
573
ret = init_gnutls_session(&session);
683
/* If the interface is specified and we have a list of interfaces */
684
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
685
/* Check if the interface is one of the interfaces we are using */
686
bool match = false;
687
{
688
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
691
if(if_nametoindex(interface) == (unsigned int)if_index){
692
match = true;
693
break;
694
}
695
}
696
}
697
if(not match){
698
/* This interface does not match any in the list, so we don't
699
connect to the server */
700
if(debug){
701
char interface[IF_NAMESIZE];
702
if(if_indextoname((unsigned int)if_index, interface) == NULL){
703
perror_plus("if_indextoname");
704
} else {
705
fprintf_plus(stderr, "Skipping server on non-used interface"
706
" \"%s\"\n",
707
if_indextoname((unsigned int)if_index,
708
interface));
709
}
710
}
711
return -1;
712
}
713
}
714
715
ret = init_gnutls_session(&session, mc);
574
716
if(ret != 0){
575
717
return -1;
576
718
}
577
719
578
720
if(debug){
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
580
"\n", ip, port);
721
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
581
723
}
582
724
583
725
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
726
if(tcp_sd < 0){
585
perror("socket");
727
int e = errno;
728
perror_plus("socket");
729
errno = e;
586
730
goto mandos_end;
587
731
}
588
732
589
733
if(quit_now){
734
errno = EINTR;
590
735
goto mandos_end;
591
736
}
592
737
593
738
memset(&to, 0, sizeof(to));
594
739
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
597
742
} else { /* IPv4 */
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
600
745
}
601
746
if(ret < 0 ){
602
perror("inet_pton");
747
int e = errno;
748
perror_plus("inet_pton");
749
errno = e;
603
750
goto mandos_end;
604
751
}
605
752
if(ret == 0){
606
fprintf(stderr, "Bad address: %s\n", ip);
753
int e = errno;
754
fprintf_plus(stderr, "Bad address: %s\n", ip);
755
errno = e;
607
756
goto mandos_end;
608
757
}
609
758
if(af == AF_INET6){
610
to.in6.sin6_port = htons(port); /* Spurious warnings from
611
-Wconversion and
612
-Wunreachable-code */
613
614
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
615
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
616
-Wunreachable-code*/
759
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
760
if(IN6_IS_ADDR_LINKLOCAL
761
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
617
762
if(if_index == AVAHI_IF_UNSPEC){
618
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
" without a network interface\n");
763
fprintf_plus(stderr, "An IPv6 link-local address is"
764
" incomplete without a network interface\n");
765
errno = EINVAL;
620
766
goto mandos_end;
621
767
}
622
768
/* Set the network interface number as scope */
623
to.in6.sin6_scope_id = (uint32_t)if_index;
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
624
770
}
625
771
} else {
626
to.in.sin_port = htons(port); /* Spurious warnings from
627
-Wconversion and
628
-Wunreachable-code */
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
629
773
}
630
774
631
775
if(quit_now){
776
errno = EINTR;
632
777
goto mandos_end;
633
778
}
634
779
636
781
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
782
char interface[IF_NAMESIZE];
638
783
if(if_indextoname((unsigned int)if_index, interface) == NULL){
639
perror("if_indextoname");
784
perror_plus("if_indextoname");
640
785
} else {
641
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
642
ip, interface, port);
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
643
788
}
644
789
} else {
645
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
646
port);
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
647
792
}
648
793
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
649
794
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
650
const char *pcret;
651
795
if(af == AF_INET6){
652
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
653
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
654
800
} else {
655
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
656
sizeof(addrstr));
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
804
NI_NUMERICHOST);
657
805
}
658
if(pcret == NULL){
659
perror("inet_ntop");
660
} else {
661
if(strcmp(addrstr, ip) != 0){
662
fprintf(stderr, "Canonical address form: %s\n", addrstr);
663
}
806
if(ret == EAI_SYSTEM){
807
perror_plus("getnameinfo");
808
} else if(ret != 0) {
809
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
810
} else if(strcmp(addrstr, ip) != 0){
811
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
664
812
}
665
813
}
666
814
667
815
if(quit_now){
816
errno = EINTR;
668
817
goto mandos_end;
669
818
}
670
819
671
820
if(af == AF_INET6){
672
ret = connect(tcp_sd, &to.in6, sizeof(to));
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
673
823
} else {
674
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
675
826
}
676
827
if(ret < 0){
677
perror("connect");
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
int e = errno;
830
perror_plus("connect");
831
errno = e;
832
}
678
833
goto mandos_end;
679
834
}
680
835
681
836
if(quit_now){
837
errno = EINTR;
682
838
goto mandos_end;
683
839
}
684
840
687
843
while(true){
688
844
size_t out_size = strlen(out);
689
845
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
690
out_size - written));
846
out_size - written));
691
847
if(ret == -1){
692
perror("write");
848
int e = errno;
849
perror_plus("write");
850
errno = e;
693
851
goto mandos_end;
694
852
}
695
853
written += (size_t)ret;
705
863
}
706
864
707
865
if(quit_now){
866
errno = EINTR;
708
867
goto mandos_end;
709
868
}
710
869
}
711
870
712
871
if(debug){
713
fprintf(stderr, "Establishing TLS session with %s\n", ip);
872
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
714
873
}
715
874
716
875
if(quit_now){
876
errno = EINTR;
717
877
goto mandos_end;
718
878
}
719
879
720
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
/* This casting via intptr_t is to eliminate warning about casting
881
an int to a pointer type. This is exactly how the GnuTLS Guile
882
function "set-session-transport-fd!" does it. */
883
gnutls_transport_set_ptr(session,
884
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
721
885
722
886
if(quit_now){
887
errno = EINTR;
723
888
goto mandos_end;
724
889
}
725
890
726
891
do {
727
892
ret = gnutls_handshake(session);
728
893
if(quit_now){
894
errno = EINTR;
729
895
goto mandos_end;
730
896
}
731
897
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
732
898
733
899
if(ret != GNUTLS_E_SUCCESS){
734
900
if(debug){
735
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
736
902
gnutls_perror(ret);
737
903
}
904
errno = EPROTO;
738
905
goto mandos_end;
739
906
}
740
907
741
908
/* Read OpenPGP packet that contains the wanted password */
742
909
743
910
if(debug){
744
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
745
ip);
911
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
912
" %s\n", ip);
746
913
}
747
914
748
915
while(true){
749
916
750
917
if(quit_now){
918
errno = EINTR;
751
919
goto mandos_end;
752
920
}
753
921
754
922
buffer_capacity = incbuffer(&buffer, buffer_length,
755
buffer_capacity);
923
buffer_capacity);
756
924
if(buffer_capacity == 0){
757
perror("incbuffer");
925
int e = errno;
926
perror_plus("incbuffer");
927
errno = e;
758
928
goto mandos_end;
759
929
}
760
930
761
931
if(quit_now){
932
errno = EINTR;
762
933
goto mandos_end;
763
934
}
764
935
777
948
ret = gnutls_handshake(session);
778
949
779
950
if(quit_now){
951
errno = EINTR;
780
952
goto mandos_end;
781
953
}
782
954
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
783
955
if(ret < 0){
784
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
956
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
957
"***\n");
785
958
gnutls_perror(ret);
959
errno = EPROTO;
786
960
goto mandos_end;
787
961
}
788
962
break;
789
963
default:
790
fprintf(stderr, "Unknown error while reading data from"
791
" encrypted session with Mandos server\n");
964
fprintf_plus(stderr, "Unknown error while reading data from"
965
" encrypted session with Mandos server\n");
792
966
gnutls_bye(session, GNUTLS_SHUT_RDWR);
967
errno = EIO;
793
968
goto mandos_end;
794
969
}
795
970
} else {
798
973
}
799
974
800
975
if(debug){
801
fprintf(stderr, "Closing TLS session\n");
976
fprintf_plus(stderr, "Closing TLS session\n");
802
977
}
803
978
804
979
if(quit_now){
980
errno = EINTR;
805
981
goto mandos_end;
806
982
}
807
983
808
984
do {
809
985
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
810
986
if(quit_now){
987
errno = EINTR;
811
988
goto mandos_end;
812
989
}
813
990
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
991
815
992
if(buffer_length > 0){
816
993
ssize_t decrypted_buffer_size;
817
decrypted_buffer_size = pgp_packet_decrypt(buffer,
818
buffer_length,
819
&decrypted_buffer);
994
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
820
996
if(decrypted_buffer_size >= 0){
821
997
822
998
written = 0;
823
999
while(written < (size_t) decrypted_buffer_size){
824
1000
if(quit_now){
1001
errno = EINTR;
825
1002
goto mandos_end;
826
1003
}
827
1004
829
1006
(size_t)decrypted_buffer_size - written,
830
1007
stdout);
831
1008
if(ret == 0 and ferror(stdout)){
1009
int e = errno;
832
1010
if(debug){
833
fprintf(stderr, "Error writing encrypted data: %s\n",
834
strerror(errno));
1011
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1012
strerror(errno));
835
1013
}
1014
errno = e;
836
1015
goto mandos_end;
837
1016
}
838
1017
written += (size_t)ret;
844
1023
/* Shutdown procedure */
845
1024
846
1025
mandos_end:
847
free(decrypted_buffer);
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1026
{
1027
int e = errno;
1028
free(decrypted_buffer);
1029
free(buffer);
1030
if(tcp_sd >= 0){
1031
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1032
}
1033
if(ret == -1){
1034
if(e == 0){
1035
e = errno;
1036
}
1037
perror_plus("close");
1038
}
1039
gnutls_deinit(session);
1040
errno = e;
1041
if(quit_now){
1042
errno = EINTR;
1043
retval = -1;
1044
}
858
1045
}
859
1046
return retval;
860
1047
}
861
1048
1049
__attribute__((nonnull))
862
1050
static void resolve_callback(AvahiSServiceResolver *r,
863
1051
AvahiIfIndex interface,
864
1052
AvahiProtocol proto,
872
1060
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
1062
flags,
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1063
void *mc){
1064
if(r == NULL){
1065
return;
1066
}
877
1067
878
1068
/* Called whenever a service has been resolved successfully or
879
1069
timed out */
885
1075
switch(event){
886
1076
default:
887
1077
case AVAHI_RESOLVER_FAILURE:
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1078
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1079
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1080
domain,
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
891
1083
break;
892
1084
893
1085
case AVAHI_RESOLVER_FOUND:
895
1087
char ip[AVAHI_ADDRESS_STR_MAX];
896
1088
avahi_address_snprint(ip, sizeof(ip), address);
897
1089
if(debug){
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1090
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1091
PRIdMAX ") on port %" PRIu16 "\n", name,
1092
host_name, ip, (intmax_t)interface, port);
901
1093
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1094
int ret = start_mandos_communication(ip, (in_port_t)port,
1095
interface,
1096
avahi_proto_to_af(proto),
1097
mc);
904
1098
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
1099
avahi_simple_poll_quit(simple_poll);
1100
} else {
1101
if(not add_server(ip, (in_port_t)port, interface,
1102
avahi_proto_to_af(proto),
1103
&((mandos_context*)mc)->current_server)){
1104
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1105
" list\n", name);
1106
}
906
1107
}
907
1108
}
908
1109
}
918
1119
const char *domain,
919
1120
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
1121
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1122
void *mc){
1123
if(b == NULL){
1124
return;
1125
}
923
1126
924
1127
/* Called whenever a new services becomes available on the LAN or
925
1128
is removed from the LAN */
932
1135
default:
933
1136
case AVAHI_BROWSER_FAILURE:
934
1137
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1138
fprintf_plus(stderr, "(Avahi browser) %s\n",
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1141
avahi_simple_poll_quit(simple_poll);
938
1142
return;
939
1143
940
1144
case AVAHI_BROWSER_NEW:
943
1147
the callback function is called the Avahi server will free the
944
1148
resolver for us. */
945
1149
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1150
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1151
interface, protocol, name, type,
1152
domain, protocol, 0,
1153
resolve_callback, mc) == NULL)
1154
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1155
" %s\n", name,
1156
avahi_strerror(avahi_server_errno
1157
(((mandos_context*)mc)->server)));
951
1158
break;
952
1159
953
1160
case AVAHI_BROWSER_REMOVE:
956
1163
case AVAHI_BROWSER_ALL_FOR_NOW:
957
1164
case AVAHI_BROWSER_CACHE_EXHAUSTED:
958
1165
if(debug){
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1166
fprintf_plus(stderr, "No Mandos server found, still"
1167
" searching...\n");
960
1168
}
961
1169
break;
962
1170
}
963
1171
}
964
1172
965
/* stop main loop after sigterm has been called */
1173
/* Signal handler that stops main loop after SIGTERM */
966
1174
static void handle_sigterm(int sig){
967
1175
if(quit_now){
968
1176
return;
970
1178
quit_now = 1;
971
1179
signal_received = sig;
972
1180
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
1181
/* set main loop to exit */
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
975
1184
}
976
1185
errno = old_errno;
977
1186
}
978
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
int ret;
1191
error_t ret_errno;
1192
1193
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
if(s < 0){
1195
ret_errno = errno;
1196
perror_plus("socket");
1197
errno = ret_errno;
1198
return false;
1199
}
1200
strcpy(ifr->ifr_name, ifname);
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
if(ret == -1){
1203
if(debug){
1204
ret_errno = errno;
1205
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1207
}
1208
return false;
1209
}
1210
return true;
1211
}
1212
1213
__attribute__((nonnull, warn_unused_result))
1214
bool good_flags(const char *ifname, const struct ifreq *ifr){
1215
1216
/* Reject the loopback device */
1217
if(ifr->ifr_flags & IFF_LOOPBACK){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
ifname);
1221
}
1222
return false;
1223
}
1224
/* Accept point-to-point devices only if connect_to is specified */
1225
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1226
if(debug){
1227
fprintf_plus(stderr, "Accepting point-to-point interface"
1228
" \"%s\"\n", ifname);
1229
}
1230
return true;
1231
}
1232
/* Otherwise, reject non-broadcast-capable devices */
1233
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1234
if(debug){
1235
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return false;
1239
}
1240
/* Reject non-ARP interfaces (including dummy interfaces) */
1241
if(ifr->ifr_flags & IFF_NOARP){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1244
ifname);
1245
}
1246
return false;
1247
}
1248
1249
/* Accept this device */
1250
if(debug){
1251
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1252
}
1253
return true;
1254
}
1255
979
1256
/*
980
1257
* This function determines if a directory entry in /sys/class/net
981
1258
* corresponds to an acceptable network device.
982
1259
* (This function is passed to scandir(3) as a filter function.)
983
1260
*/
1261
__attribute__((nonnull, warn_unused_result))
984
1262
int good_interface(const struct dirent *if_entry){
985
ssize_t ssret;
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
988
if_entry->d_name);
989
if(ret < 0){
990
perror("asprintf");
991
return 0;
992
}
993
1263
if(if_entry->d_name[0] == '.'){
994
1264
return 0;
995
1265
}
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
997
if(flags_fd == -1){
998
perror("open");
999
return 0;
1000
}
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1005
flagstring[(size_t)to_read] = '\0';
1006
if(flagstring == NULL){
1007
perror("malloc");
1008
close(flags_fd);
1009
return 0;
1010
}
1011
while(to_read > 0){
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1013
(size_t)to_read));
1014
if(ssret == -1){
1015
perror("read");
1016
free(flagstring);
1017
close(flags_fd);
1018
return 0;
1019
}
1020
to_read -= ssret;
1021
if(ssret == 0){
1266
1267
struct ifreq ifr;
1268
if(not get_flags(if_entry->d_name, &ifr)){
1269
if(debug){
1270
fprintf_plus(stderr, "Failed to get flags for interface "
1271
"\"%s\"\n", if_entry->d_name);
1272
}
1273
return 0;
1274
}
1275
1276
if(not good_flags(if_entry->d_name, &ifr)){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/*
1283
* This function determines if a network interface is up.
1284
*/
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1287
struct ifreq ifr;
1288
if(not get_flags(interface, &ifr)){
1289
if(debug){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1292
}
1293
return false;
1294
}
1295
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1297
}
1298
1299
/*
1300
* This function determines if a network interface is running
1301
*/
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1304
struct ifreq ifr;
1305
if(not get_flags(interface, &ifr)){
1306
if(debug){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1309
}
1310
return false;
1311
}
1312
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1314
}
1315
1316
__attribute__((nonnull, pure, warn_unused_result))
1317
int notdotentries(const struct dirent *direntry){
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
return 0;
1324
}
1325
return 1;
1326
}
1327
1328
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
int runnable_hook(const struct dirent *direntry){
1331
int ret;
1332
size_t sret;
1333
struct stat st;
1334
1335
if((direntry->d_name)[0] == '\0'){
1336
/* Empty name? */
1337
return 0;
1338
}
1339
1340
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
"abcdefghijklmnopqrstuvwxyz"
1342
"0123456789"
1343
"_.-");
1344
if((direntry->d_name)[sret] != '\0'){
1345
/* Contains non-allowed characters */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1348
direntry->d_name);
1349
}
1350
return 0;
1351
}
1352
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1386
int ret;
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1390
1391
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1396
}
1397
ret = avahi_simple_poll_iterate(s, -1);
1398
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1402
}
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1405
if(ret == -1){
1406
perror_plus("clock_gettime");
1407
return -1;
1408
}
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1425
}
1426
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1432
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1434
return 0;
1435
}
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1438
if(ret == -1){
1439
perror_plus("clock_gettime");
1440
return -1;
1441
}
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1445
}
1446
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
}
1449
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1452
}
1453
}
1454
}
1455
}
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1511
const float delay){
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1517
if(debug){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1520
}
1521
} else {
1522
perror_plus("open");
1523
}
1524
return;
1525
}
1526
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1539
if(numhooks == -1){
1540
perror_plus("scandir");
1541
return;
1542
}
1543
struct dirent *direntry;
1544
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1548
if(debug){
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1550
direntry->d_name);
1551
}
1552
pid_t hook_pid = fork();
1553
if(hook_pid == 0){
1554
/* Child */
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1557
if(errno != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
errno = ret_errno;
1737
perror_plus("Failed to raise privileges");
1738
}
1739
1740
#ifdef __linux__
1741
int ret_linux;
1742
bool restore_loglevel = false;
1743
if(ret_errno == 0){
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1749
} else {
1750
restore_loglevel = true;
1751
}
1752
}
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1756
#ifdef __linux__
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1761
}
1762
}
1763
#endif /* __linux__ */
1764
1765
/* If raise_privileges() succeeded above */
1766
if(ret_errno == 0){
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1769
if(ret_errno != 0){
1770
errno = ret_errno;
1771
perror_plus("Failed to lower privileges");
1772
}
1773
}
1774
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1784
errno = old_errno;
1785
return ioctl_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1789
interface);
1790
}
1791
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1022
1796
break;
1023
1797
}
1024
}
1025
close(flags_fd);
1026
intmax_t tmpmax;
1027
char *tmp;
1028
errno = 0;
1029
tmpmax = strtoimax(flagstring, &tmp, 0);
1030
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1031
and not (isspace(*tmp)))
1032
or tmpmax != (ifreq_flags)tmpmax){
1033
if(debug){
1034
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1035
flagstring, if_entry->d_name);
1036
}
1037
free(flagstring);
1038
return 0;
1039
}
1040
free(flagstring);
1041
ifreq_flags flags = (ifreq_flags)tmpmax;
1042
/* Reject the loopback device */
1043
if(flags & IFF_LOOPBACK){
1044
if(debug){
1045
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1046
if_entry->d_name);
1047
}
1048
return 0;
1049
}
1050
/* Accept point-to-point devices only if connect_to is specified */
1051
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1052
if(debug){
1053
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1054
if_entry->d_name);
1055
}
1056
return 1;
1057
}
1058
/* Otherwise, reject non-broadcast-capable devices */
1059
if(not (flags & IFF_BROADCAST)){
1060
if(debug){
1061
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1062
if_entry->d_name);
1063
}
1064
return 0;
1065
}
1066
/* Accept this device */
1067
if(debug){
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1069
if_entry->d_name);
1070
}
1071
return 1;
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1802
}
1803
}
1804
1805
errno = old_errno;
1806
return 0;
1807
}
1808
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1822
ret_errno = errno;
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1825
errno = old_errno;
1826
return ret_errno;
1827
}
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1829
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1831
if(sd == -1){
1832
ret_errno = errno;
1833
perror_plus("socket");
1834
errno = old_errno;
1835
return ret_errno;
1836
}
1837
1838
if(debug){
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1840
interface);
1841
}
1842
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1845
if(ret_errno != 0){
1846
errno = ret_errno;
1847
perror_plus("Failed to raise privileges");
1848
}
1849
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1852
1853
/* If raise_privileges() succeeded above */
1854
if(ret_errno == 0){
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1857
if(ret_errno != 0){
1858
errno = ret_errno;
1859
perror_plus("Failed to lower privileges");
1860
}
1861
}
1862
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1865
if(ret == -1){
1866
perror_plus("close");
1867
}
1868
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1872
errno = old_errno;
1873
return ioctl_errno;
1874
}
1875
} else if(debug){
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1877
interface);
1878
}
1879
1880
errno = old_errno;
1881
return 0;
1072
1882
}
1073
1883
1074
1884
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1075
1889
AvahiSServiceBrowser *sb = NULL;
1076
int error;
1890
error_t ret_errno;
1077
1891
int ret;
1078
1892
intmax_t tmpmax;
1079
1893
char *tmp;
1080
1894
int exitcode = EXIT_SUCCESS;
1081
const char *interface = "";
1082
struct ifreq network;
1083
int sd = -1;
1084
bool take_down_interface = false;
1085
uid_t uid;
1086
gid_t gid;
1087
char tempdir[] = "/tmp/mandosXXXXXX";
1088
bool tempdir_created = false;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1089
1900
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1090
1901
const char *seckey = PATHDIR "/" SECKEY;
1091
1902
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1092
1904
1093
1905
bool gnutls_initialized = false;
1094
1906
bool gpgme_initialized = false;
1095
1907
float delay = 2.5f;
1908
double retry_interval = 10; /* 10s between trying a server and
1909
retrying the same server again */
1096
1910
1097
1911
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1098
1912
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1104
1918
errno = 0;
1105
1919
ret = setgid(gid);
1106
1920
if(ret == -1){
1107
perror("setgid");
1921
perror_plus("setgid");
1108
1922
}
1109
1923
1110
1924
/* Lower user privileges (temporarily) */
1111
1925
errno = 0;
1112
1926
ret = seteuid(uid);
1113
1927
if(ret == -1){
1114
perror("seteuid");
1928
perror_plus("seteuid");
1115
1929
}
1116
1930
1117
1931
if(quit_now){
1152
1966
.arg = "SECONDS",
1153
1967
.doc = "Maximum delay to wait for interface startup",
1154
1968
.group = 2 },
1969
{ .name = "retry", .key = 132,
1970
.arg = "SECONDS",
1971
.doc = "Retry interval used when denied by the Mandos server",
1972
.group = 2 },
1973
{ .name = "network-hook-dir", .key = 133,
1974
.arg = "DIR",
1975
.doc = "Directory where network hooks are located",
1976
.group = 2 },
1977
/*
1978
* These reproduce what we would get without ARGP_NO_HELP
1979
*/
1980
{ .name = "help", .key = '?',
1981
.doc = "Give this help list", .group = -1 },
1982
{ .name = "usage", .key = -3,
1983
.doc = "Give a short usage message", .group = -1 },
1984
{ .name = "version", .key = 'V',
1985
.doc = "Print program version", .group = -1 },
1155
1986
{ .name = NULL }
1156
1987
};
1157
1988
1158
1989
error_t parse_opt(int key, char *arg,
1159
1990
struct argp_state *state){
1991
errno = 0;
1160
1992
switch(key){
1161
1993
case 128: /* --debug */
1162
1994
debug = true;
1165
1997
connect_to = arg;
1166
1998
break;
1167
1999
case 'i': /* --interface */
1168
interface = arg;
2000
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2001
arg, (int)',');
2002
if(ret_errno != 0){
2003
argp_error(state, "%s", strerror(ret_errno));
2004
}
1169
2005
break;
1170
2006
case 's': /* --seckey */
1171
2007
seckey = arg;
1178
2014
tmpmax = strtoimax(arg, &tmp, 10);
1179
2015
if(errno != 0 or tmp == arg or *tmp != '\0'
1180
2016
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1181
fprintf(stderr, "Bad number of DH bits\n");
1182
exit(EXIT_FAILURE);
2017
argp_error(state, "Bad number of DH bits");
1183
2018
}
1184
2019
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1185
2020
break;
1190
2025
errno = 0;
1191
2026
delay = strtof(arg, &tmp);
1192
2027
if(errno != 0 or tmp == arg or *tmp != '\0'){
1193
fprintf(stderr, "Bad delay\n");
1194
exit(EXIT_FAILURE);
1195
}
1196
break;
1197
case ARGP_KEY_ARG:
1198
argp_usage(state);
1199
case ARGP_KEY_END:
2028
argp_error(state, "Bad delay");
2029
}
2030
case 132: /* --retry */
2031
errno = 0;
2032
retry_interval = strtod(arg, &tmp);
2033
if(errno != 0 or tmp == arg or *tmp != '\0'
2034
or (retry_interval * 1000) > INT_MAX
2035
or retry_interval < 0){
2036
argp_error(state, "Bad retry interval");
2037
}
2038
break;
2039
case 133: /* --network-hook-dir */
2040
hookdir = arg;
2041
break;
2042
/*
2043
* These reproduce what we would get without ARGP_NO_HELP
2044
*/
2045
case '?': /* --help */
2046
argp_state_help(state, state->out_stream,
2047
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2048
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2049
case -3: /* --usage */
2050
argp_state_help(state, state->out_stream,
2051
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2052
case 'V': /* --version */
2053
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2054
exit(argp_err_exit_status);
1200
2055
break;
1201
2056
default:
1202
2057
return ARGP_ERR_UNKNOWN;
1203
2058
}
1204
return 0;
2059
return errno;
1205
2060
}
1206
2061
1207
2062
struct argp argp = { .options = options, .parser = parse_opt,
1208
2063
.args_doc = "",
1209
2064
.doc = "Mandos client -- Get and decrypt"
1210
2065
" passwords from a Mandos server" };
1211
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1212
if(ret == ARGP_ERR_UNKNOWN){
1213
fprintf(stderr, "Unknown error while parsing arguments\n");
1214
exitcode = EXIT_FAILURE;
1215
goto end;
1216
}
2066
ret = argp_parse(&argp, argc, argv,
2067
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2068
switch(ret){
2069
case 0:
2070
break;
2071
case ENOMEM:
2072
default:
2073
errno = ret;
2074
perror_plus("argp_parse");
2075
exitcode = EX_OSERR;
2076
goto end;
2077
case EINVAL:
2078
exitcode = EX_USAGE;
2079
goto end;
2080
}
2081
}
2082
2083
{
2084
/* Work around Debian bug #633582:
2085
<http://bugs.debian.org/633582> */
2086
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2091
perror_plus("Failed to raise privileges");
2092
} else {
2093
struct stat st;
2094
2095
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2096
int seckey_fd = open(seckey, O_RDONLY);
2097
if(seckey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(seckey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2113
}
2114
}
2115
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2118
if(pubkey_fd == -1){
2119
perror_plus("open");
2120
} else {
2121
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2122
if(ret == -1){
2123
perror_plus("fstat");
2124
} else {
2125
if(S_ISREG(st.st_mode)
2126
and st.st_uid == 0 and st.st_gid == 0){
2127
ret = fchown(pubkey_fd, uid, gid);
2128
if(ret == -1){
2129
perror_plus("fchown");
2130
}
2131
}
2132
}
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
2137
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to lower privileges");
2142
}
2143
}
2144
}
2145
2146
/* Remove invalid interface names (except "none") */
2147
{
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2150
interface))){
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2156
}
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2158
interface = NULL;
2159
}
2160
}
2161
}
2162
2163
/* Run network hooks */
2164
{
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2169
goto end;
2170
}
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2173
}
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
1217
2176
}
1218
2177
1219
2178
if(not debug){
1220
2179
avahi_set_log_function(empty_log);
1221
2180
}
1222
1223
if(interface[0] == '\0'){
1224
struct dirent **direntries;
1225
ret = scandir(sys_class_net, &direntries, good_interface,
1226
alphasort);
1227
if(ret >= 1){
1228
/* Pick the first good interface */
1229
interface = strdup(direntries[0]->d_name);
1230
if(debug){
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1232
}
1233
if(interface == NULL){
1234
perror("malloc");
1235
free(direntries);
1236
exitcode = EXIT_FAILURE;
1237
goto end;
1238
}
1239
free(direntries);
1240
} else {
1241
free(direntries);
1242
fprintf(stderr, "Could not find a network interface\n");
1243
exitcode = EXIT_FAILURE;
1244
goto end;
1245
}
1246
}
1247
2181
1248
2182
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1249
2183
from the signal handler */
1250
2184
/* Initialize the pseudo-RNG for Avahi */
1251
2185
srand((unsigned int) time(NULL));
1252
mc.simple_poll = avahi_simple_poll_new();
1253
if(mc.simple_poll == NULL){
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1255
exitcode = EXIT_FAILURE;
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
2188
fprintf_plus(stderr,
2189
"Avahi: Failed to create simple poll object.\n");
2190
exitcode = EX_UNAVAILABLE;
1256
2191
goto end;
1257
2192
}
1258
2193
1259
2194
sigemptyset(&sigterm_action.sa_mask);
1260
2195
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1261
2196
if(ret == -1){
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
2197
perror_plus("sigaddset");
2198
exitcode = EX_OSERR;
1264
2199
goto end;
1265
2200
}
1266
2201
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1267
2202
if(ret == -1){
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
2203
perror_plus("sigaddset");
2204
exitcode = EX_OSERR;
1270
2205
goto end;
1271
2206
}
1272
2207
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1273
2208
if(ret == -1){
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
2209
perror_plus("sigaddset");
2210
exitcode = EX_OSERR;
1276
2211
goto end;
1277
2212
}
1278
2213
/* Need to check if the handler is SIG_IGN before handling:
1281
2216
*/
1282
2217
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1283
2218
if(ret == -1){
1284
perror("sigaction");
1285
return EXIT_FAILURE;
2219
perror_plus("sigaction");
2220
return EX_OSERR;
1286
2221
}
1287
2222
if(old_sigterm_action.sa_handler != SIG_IGN){
1288
2223
ret = sigaction(SIGINT, &sigterm_action, NULL);
1289
2224
if(ret == -1){
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
2225
perror_plus("sigaction");
2226
exitcode = EX_OSERR;
1292
2227
goto end;
1293
2228
}
1294
2229
}
1295
2230
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1296
2231
if(ret == -1){
1297
perror("sigaction");
1298
return EXIT_FAILURE;
2232
perror_plus("sigaction");
2233
return EX_OSERR;
1299
2234
}
1300
2235
if(old_sigterm_action.sa_handler != SIG_IGN){
1301
2236
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1302
2237
if(ret == -1){
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
2238
perror_plus("sigaction");
2239
exitcode = EX_OSERR;
1305
2240
goto end;
1306
2241
}
1307
2242
}
1308
2243
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1309
2244
if(ret == -1){
1310
perror("sigaction");
1311
return EXIT_FAILURE;
2245
perror_plus("sigaction");
2246
return EX_OSERR;
1312
2247
}
1313
2248
if(old_sigterm_action.sa_handler != SIG_IGN){
1314
2249
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1315
2250
if(ret == -1){
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1318
goto end;
1319
}
1320
}
1321
1322
/* If the interface is down, bring it up */
1323
if(strcmp(interface, "none") != 0){
1324
if_index = (AvahiIfIndex) if_nametoindex(interface);
1325
if(if_index == 0){
1326
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1327
exitcode = EXIT_FAILURE;
1328
goto end;
1329
}
1330
1331
if(quit_now){
1332
goto end;
1333
}
1334
1335
/* Re-raise priviliges */
1336
errno = 0;
1337
ret = seteuid(0);
1338
if(ret == -1){
1339
perror("seteuid");
1340
}
1341
1342
#ifdef __linux__
1343
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1344
messages to mess up the prompt */
1345
ret = klogctl(8, NULL, 5);
1346
bool restore_loglevel = true;
1347
if(ret == -1){
1348
restore_loglevel = false;
1349
perror("klogctl");
1350
}
1351
#endif /* __linux__ */
1352
1353
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1354
if(sd < 0){
1355
perror("socket");
1356
exitcode = EXIT_FAILURE;
1357
#ifdef __linux__
1358
if(restore_loglevel){
1359
ret = klogctl(7, NULL, 0);
1360
if(ret == -1){
1361
perror("klogctl");
1362
}
1363
}
1364
#endif /* __linux__ */
1365
/* Lower privileges */
1366
errno = 0;
1367
ret = seteuid(uid);
1368
if(ret == -1){
1369
perror("seteuid");
1370
}
1371
goto end;
1372
}
1373
strcpy(network.ifr_name, interface);
1374
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1375
if(ret == -1){
1376
perror("ioctl SIOCGIFFLAGS");
1377
#ifdef __linux__
1378
if(restore_loglevel){
1379
ret = klogctl(7, NULL, 0);
1380
if(ret == -1){
1381
perror("klogctl");
1382
}
1383
}
1384
#endif /* __linux__ */
1385
exitcode = EXIT_FAILURE;
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
goto end;
1393
}
1394
if((network.ifr_flags & IFF_UP) == 0){
1395
network.ifr_flags |= IFF_UP;
1396
take_down_interface = true;
1397
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1398
if(ret == -1){
1399
take_down_interface = false;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1401
exitcode = EXIT_FAILURE;
1402
#ifdef __linux__
1403
if(restore_loglevel){
1404
ret = klogctl(7, NULL, 0);
1405
if(ret == -1){
1406
perror("klogctl");
2251
perror_plus("sigaction");
2252
exitcode = EX_OSERR;
2253
goto end;
2254
}
2255
}
2256
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2262
alphasort);
2263
if(ret >= 1){
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("argz_add");
2271
continue;
2272
}
2273
if(debug){
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
2276
}
2277
}
2278
free(direntries);
2279
} else {
2280
if(ret == 0){
2281
free(direntries);
2282
}
2283
fprintf_plus(stderr, "Could not find a network interface\n");
2284
exitcode = EXIT_FAILURE;
2285
goto end;
2286
}
2287
}
2288
2289
/* Bring up interfaces which are down, and remove any "none"s */
2290
{
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2293
interface))){
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2298
interface);
2299
interface = NULL;
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2304
interface);
2305
interface = NULL;
1407
2306
}
1408
2307
}
1409
#endif /* __linux__ */
1410
/* Lower privileges */
1411
errno = 0;
1412
ret = seteuid(uid);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
goto end;
1417
}
1418
}
1419
/* sleep checking until interface is running */
1420
for(int i=0; i < delay * 4; i++){
1421
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1422
if(ret == -1){
1423
perror("ioctl SIOCGIFFLAGS");
1424
} else if(network.ifr_flags & IFF_RUNNING){
1425
2308
break;
1426
2309
}
1427
struct timespec sleeptime = { .tv_nsec = 250000000 };
1428
ret = nanosleep(&sleeptime, NULL);
1429
if(ret == -1 and errno != EINTR){
1430
perror("nanosleep");
1431
}
1432
}
1433
if(not take_down_interface){
1434
/* We won't need the socket anymore */
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1436
if(ret == -1){
1437
perror("close");
1438
}
1439
}
1440
#ifdef __linux__
1441
if(restore_loglevel){
1442
/* Restores kernel loglevel to default */
1443
ret = klogctl(7, NULL, 0);
1444
if(ret == -1){
1445
perror("klogctl");
1446
}
1447
}
1448
#endif /* __linux__ */
1449
/* Lower privileges */
1450
errno = 0;
1451
if(take_down_interface){
1452
/* Lower privileges */
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror("seteuid");
1456
}
1457
} else {
1458
/* Lower privileges permanently */
1459
ret = setuid(uid);
1460
if(ret == -1){
1461
perror("setuid");
1462
}
1463
}
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2313
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2315
} else {
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2318
interface);
2319
if(errno != 0){
2320
perror_plus("argz_add");
2321
}
2322
}
2323
}
2324
}
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2327
}
2328
}
2329
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2332
if(debug){
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2334
mc.interfaces);
2335
}
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1464
2337
}
1465
2338
1466
2339
if(quit_now){
1467
2340
goto end;
1468
2341
}
1469
2342
1470
ret = init_gnutls_global(pubkey, seckey);
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
1471
2344
if(ret == -1){
1472
fprintf(stderr, "init_gnutls_global failed\n");
1473
exitcode = EXIT_FAILURE;
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
2346
exitcode = EX_UNAVAILABLE;
1474
2347
goto end;
1475
2348
} else {
1476
2349
gnutls_initialized = true;
1480
2353
goto end;
1481
2354
}
1482
2355
1483
tempdir_created = true;
1484
if(mkdtemp(tempdir) == NULL){
1485
tempdir_created = false;
1486
perror("mkdtemp");
2356
/* Try /run/tmp before /tmp */
2357
tempdir = mkdtemp(run_tempdir);
2358
if(tempdir == NULL and errno == ENOENT){
2359
if(debug){
2360
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2361
run_tempdir, old_tempdir);
2362
}
2363
tempdir = mkdtemp(old_tempdir);
2364
}
2365
if(tempdir == NULL){
2366
perror_plus("mkdtemp");
1487
2367
goto end;
1488
2368
}
1489
2369
1491
2371
goto end;
1492
2372
}
1493
2373
1494
if(not init_gpgme(pubkey, seckey, tempdir)){
1495
fprintf(stderr, "init_gpgme failed\n");
1496
exitcode = EXIT_FAILURE;
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2375
fprintf_plus(stderr, "init_gpgme failed\n");
2376
exitcode = EX_UNAVAILABLE;
1497
2377
goto end;
1498
2378
} else {
1499
2379
gpgme_initialized = true;
1507
2387
/* Connect directly, do not use Zeroconf */
1508
2388
/* (Mainly meant for debugging) */
1509
2389
char *address = strrchr(connect_to, ':');
2390
1510
2391
if(address == NULL){
1511
fprintf(stderr, "No colon in address\n");
1512
exitcode = EXIT_FAILURE;
2392
fprintf_plus(stderr, "No colon in address\n");
2393
exitcode = EX_USAGE;
1513
2394
goto end;
1514
2395
}
1515
2396
1517
2398
goto end;
1518
2399
}
1519
2400
1520
uint16_t port;
2401
in_port_t port;
1521
2402
errno = 0;
1522
2403
tmpmax = strtoimax(address+1, &tmp, 10);
1523
2404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1524
or tmpmax != (uint16_t)tmpmax){
1525
fprintf(stderr, "Bad port number\n");
1526
exitcode = EXIT_FAILURE;
2405
or tmpmax != (in_port_t)tmpmax){
2406
fprintf_plus(stderr, "Bad port number\n");
2407
exitcode = EX_USAGE;
1527
2408
goto end;
1528
2409
}
1529
2410
1530
2411
if(quit_now){
1531
2412
goto end;
1532
2413
}
1533
2414
1534
port = (uint16_t)tmpmax;
2415
port = (in_port_t)tmpmax;
1535
2416
*address = '\0';
1536
address = connect_to;
1537
2417
/* Colon in address indicates IPv6 */
1538
2418
int af;
1539
if(strchr(address, ':') != NULL){
2419
if(strchr(connect_to, ':') != NULL){
1540
2420
af = AF_INET6;
2421
/* Accept [] around IPv6 address - see RFC 5952 */
2422
if(connect_to[0] == '[' and address[-1] == ']')
2423
{
2424
connect_to++;
2425
address[-1] = '\0';
2426
}
1541
2427
} else {
1542
2428
af = AF_INET;
1543
2429
}
2430
address = connect_to;
1544
2431
1545
2432
if(quit_now){
1546
2433
goto end;
1547
2434
}
1548
2435
1549
ret = start_mandos_communication(address, port, if_index, af);
1550
if(ret < 0){
1551
exitcode = EXIT_FAILURE;
1552
} else {
2436
while(not quit_now){
2437
ret = start_mandos_communication(address, port, if_index, af,
2438
&mc);
2439
if(quit_now or ret == 0){
2440
break;
2441
}
2442
if(debug){
2443
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
(int)retry_interval);
2445
}
2446
sleep((unsigned int)retry_interval);
2447
}
2448
2449
if(not quit_now){
1553
2450
exitcode = EXIT_SUCCESS;
1554
2451
}
2452
1555
2453
goto end;
1556
2454
}
1557
2455
1569
2467
config.publish_domain = 0;
1570
2468
1571
2469
/* Allocate a new server */
1572
mc.server = avahi_server_new(avahi_simple_poll_get
1573
(mc.simple_poll), &config, NULL,
1574
NULL, &error);
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
1575
2472
1576
2473
/* Free the Avahi configuration data */
1577
2474
avahi_server_config_free(&config);
1579
2476
1580
2477
/* Check if creating the Avahi server object succeeded */
1581
2478
if(mc.server == NULL){
1582
fprintf(stderr, "Failed to create Avahi server: %s\n",
1583
avahi_strerror(error));
1584
exitcode = EXIT_FAILURE;
2479
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
2481
exitcode = EX_UNAVAILABLE;
1585
2482
goto end;
1586
2483
}
1587
2484
1592
2489
/* Create the Avahi service browser */
1593
2490
sb = avahi_s_service_browser_new(mc.server, if_index,
1594
2491
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1595
NULL, 0, browse_callback, NULL);
2492
NULL, 0, browse_callback,
2493
(void *)&mc);
1596
2494
if(sb == NULL){
1597
fprintf(stderr, "Failed to create service browser: %s\n",
1598
avahi_strerror(avahi_server_errno(mc.server)));
1599
exitcode = EXIT_FAILURE;
2495
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
avahi_strerror(avahi_server_errno(mc.server)));
2497
exitcode = EX_UNAVAILABLE;
1600
2498
goto end;
1601
2499
}
1602
2500
1607
2505
/* Run the main loop */
1608
2506
1609
2507
if(debug){
1610
fprintf(stderr, "Starting Avahi loop search\n");
2508
fprintf_plus(stderr, "Starting Avahi loop search\n");
1611
2509
}
1612
2510
1613
avahi_simple_poll_loop(mc.simple_poll);
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
2513
if(debug){
2514
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
(ret == 0) ? "successfully" : "with error");
2516
}
1614
2517
1615
2518
end:
1616
2519
1617
2520
if(debug){
1618
fprintf(stderr, "%s exiting\n", argv[0]);
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1619
2522
}
1620
2523
1621
2524
/* Cleanup things */
2525
free(mc.interfaces);
2526
1622
2527
if(sb != NULL)
1623
2528
avahi_s_service_browser_free(sb);
1624
2529
1625
2530
if(mc.server != NULL)
1626
2531
avahi_server_free(mc.server);
1627
2532
1628
if(mc.simple_poll != NULL)
1629
avahi_simple_poll_free(mc.simple_poll);
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
1630
2535
1631
2536
if(gnutls_initialized){
1632
2537
gnutls_certificate_free_credentials(mc.cred);
1638
2543
gpgme_release(mc.ctx);
1639
2544
}
1640
2545
1641
/* Take down the network interface */
1642
if(take_down_interface){
1643
/* Re-raise priviliges */
1644
errno = 0;
1645
ret = seteuid(0);
1646
if(ret == -1){
1647
perror("seteuid");
1648
}
1649
if(geteuid() == 0){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_UP) {
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1656
if(ret == -1){
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1658
}
1659
}
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror("close");
1663
}
1664
/* Lower privileges permanently */
1665
errno = 0;
1666
ret = setuid(uid);
1667
if(ret == -1){
1668
perror("setuid");
1669
}
1670
}
1671
}
1672
1673
/* Removes the temp directory used by GPGME */
1674
if(tempdir_created){
1675
DIR *d;
1676
struct dirent *direntry;
1677
d = opendir(tempdir);
1678
if(d == NULL){
1679
if(errno != ENOENT){
1680
perror("opendir");
1681
}
1682
} else {
1683
while(true){
1684
direntry = readdir(d);
1685
if(direntry == NULL){
1686
break;
1687
}
1688
/* Skip "." and ".." */
1689
if(direntry->d_name[0] == '.'
1690
and (direntry->d_name[1] == '\0'
1691
or (direntry->d_name[1] == '.'
1692
and direntry->d_name[2] == '\0'))){
1693
continue;
1694
}
1695
char *fullname = NULL;
1696
ret = asprintf(&fullname, "%s/%s", tempdir,
1697
direntry->d_name);
1698
if(ret < 0){
1699
perror("asprintf");
1700
continue;
1701
}
1702
ret = remove(fullname);
1703
if(ret == -1){
1704
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1705
strerror(errno));
1706
}
1707
free(fullname);
1708
}
1709
closedir(d);
1710
}
1711
ret = rmdir(tempdir);
1712
if(ret == -1 and errno != ENOENT){
1713
perror("rmdir");
2546
/* Cleans up the circular linked list of Mandos servers the client
2547
has seen */
2548
if(mc.current_server != NULL){
2549
mc.current_server->prev->next = NULL;
2550
while(mc.current_server != NULL){
2551
server *next = mc.current_server->next;
2552
free(mc.current_server);
2553
mc.current_server = next;
2554
}
2555
}
2556
2557
/* Re-raise privileges */
2558
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
2562
perror_plus("Failed to raise privileges");
2563
} else {
2564
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2568
2569
/* Take down the network interfaces which were brought up */
2570
{
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to take down interface");
2579
}
2580
}
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2583
" down\n");
2584
}
2585
}
2586
}
2587
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
2591
perror_plus("Failed to lower privileges permanently");
2592
}
2593
}
2594
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2597
2598
/* Removes the GPGME temp directory and all files inside */
2599
if(tempdir != NULL){
2600
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2637
}
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
1714
2639
}
1715
2640
}
1716
2641
1721
2646
&old_sigterm_action,
1722
2647
NULL));
1723
2648
if(ret == -1){
1724
perror("sigaction");
2649
perror_plus("sigaction");
1725
2650
}
1726
2651
do {
1727
2652
ret = raise(signal_received);
1728
2653
} while(ret != 0 and errno == EINTR);
1729
2654
if(ret != 0){
1730
perror("raise");
2655
perror_plus("raise");
1731
2656
abort();
1732
2657
}
1733
2658
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0