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- Committer: Teddy Hogeborn
- Date: 2012-06-13 22:06:57 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120613220657-qvq7c7nrndl3t413
* plugins.d/mandos-client.c (get_flags): Don't clobber errno.
(up_interface): Removed; replaced with "interface_is_up".
(interface_is_up, interface_is_running,
lower_privileges_permanently, take_down_interface): New.
(bring_up_interface): Return "error_t". Use new functions
"interface_is_up", "get_flags", and
"interface_is_running".
(main): Save all interfaces either autodetected or specified with
--interface in argz vector "interfaces". Save interfaces to
take down on exit in argz vector "interfaces_to_take_down".
Save interface names for DEVICE variable to network hooks as
argz_vector "interfaces_hooks". Bug fix: Be privileged
while stopping network hooks.
* plugins.d/mandos-client.xml (SYNOPSIS): Changed --interface synopsis.
(DESCRIPTION): Updated to document use of all interfaces.
(OPTIONS): Updated description of "--interface".
* network-hooks.d/bridge: Parse comma-separated DEVICE environment
variable.
* network-hooks.d/openvpn: - '' -
* network-hooks.d/wireless: - '' -
(up_interface): Removed; replaced with "interface_is_up".
(interface_is_up, interface_is_running,
lower_privileges_permanently, take_down_interface): New.
(bring_up_interface): Return "error_t". Use new functions
"interface_is_up", "get_flags", and
"interface_is_running".
(main): Save all interfaces either autodetected or specified with
--interface in argz vector "interfaces". Save interfaces to
take down on exit in argz vector "interfaces_to_take_down".
Save interface names for DEVICE variable to network hooks as
argz_vector "interfaces_hooks". Bug fix: Be privileged
while stopping network hooks.
* plugins.d/mandos-client.xml (SYNOPSIS): Changed --interface synopsis.
(DESCRIPTION): Updated to document use of all interfaces.
(OPTIONS): Updated description of "--interface".
* network-hooks.d/bridge: Parse comma-separated DEVICE environment
variable.
* network-hooks.d/openvpn: - '' -
* network-hooks.d/wireless: - '' -
- files added:
- DBUS-API
- debian/source
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
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
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
84
sigaction(), SIGTERM, sig_atomic_t,
84
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
85
95
86
96
#ifdef __linux__
87
97
#include <sys/klog.h> /* klogctl() */
105
115
init_gnutls_session(),
106
116
GNUTLS_* */
107
117
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
118
/* gnutls_certificate_set_openpgp_key_file(),
119
GNUTLS_OPENPGP_FMT_BASE64 */
110
120
111
121
/* GPGME */
112
122
#include <gpgme.h> /* All GPGME types, constants and
120
130
#define PATHDIR "/conf/conf.d/mandos"
121
131
#define SECKEY "seckey.txt"
122
132
#define PUBKEY "pubkey.txt"
133
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
134
124
135
bool debug = false;
125
136
static const char mandos_protocol_version[] = "1";
126
137
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
138
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
static const char sys_class_net[] = "/sys/class/net";
140
char *connect_to = NULL;
141
const char *hookdir = HOOKDIR;
142
uid_t uid = 65534;
143
gid_t gid = 65534;
144
145
/* Doubly linked list that need to be circularly linked when used */
146
typedef struct server{
147
const char *ip;
148
uint16_t port;
149
AvahiIfIndex if_index;
150
int af;
151
struct timespec last_seen;
152
struct server *next;
153
struct server *prev;
154
} server;
128
155
129
156
/* Used for passing in values through the Avahi callback functions */
130
157
typedef struct {
135
162
gnutls_dh_params_t dh_params;
136
163
const char *priority;
137
164
gpgme_ctx_t ctx;
165
server *current_server;
138
166
} mandos_context;
139
167
140
168
/* global context so signal handler can reach it*/
141
169
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
170
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
144
173
145
174
sig_atomic_t quit_now = 0;
146
175
int signal_received = 0;
147
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
148
196
/*
149
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
198
* bytes. "buffer_capacity" is how much is currently allocated,
151
199
* "buffer_length" is how much is already used.
152
200
*/
153
201
size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t buffer_capacity){
202
size_t buffer_capacity){
155
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
204
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
205
if(buffer == NULL){
162
210
return buffer_capacity;
163
211
}
164
212
213
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
216
int ret;
217
server *new_server = malloc(sizeof(server));
218
if(new_server == NULL){
219
perror_plus("malloc");
220
return false;
221
}
222
*new_server = (server){ .ip = strdup(ip),
223
.port = port,
224
.if_index = if_index,
225
.af = af };
226
if(new_server->ip == NULL){
227
perror_plus("strdup");
228
return false;
229
}
230
/* Special case of first server */
231
if (mc.current_server == NULL){
232
new_server->next = new_server;
233
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
236
} else {
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
239
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
246
}
247
return true;
248
}
249
165
250
/*
166
251
* Initialize GPGME.
167
252
*/
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
170
255
gpgme_error_t rc;
171
256
gpgme_engine_info_t engine_info;
172
257
181
266
182
267
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
183
268
if(fd == -1){
184
perror("open");
269
perror_plus("open");
185
270
return false;
186
271
}
187
272
188
273
rc = gpgme_data_new_from_fd(&pgp_data, fd);
189
274
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
275
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
192
277
return false;
193
278
}
194
279
195
280
rc = gpgme_op_import(mc.ctx, pgp_data);
196
281
if(rc != GPG_ERR_NO_ERROR){
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
199
284
return false;
200
285
}
201
286
202
287
ret = (int)TEMP_FAILURE_RETRY(close(fd));
203
288
if(ret == -1){
204
perror("close");
289
perror_plus("close");
205
290
}
206
291
gpgme_data_release(pgp_data);
207
292
return true;
208
293
}
209
294
210
295
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
296
fprintf_plus(stderr, "Initializing GPGME\n");
212
297
}
213
298
214
299
/* Init GPGME */
215
300
gpgme_check_version(NULL);
216
301
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
217
302
if(rc != GPG_ERR_NO_ERROR){
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
220
305
return false;
221
306
}
222
307
223
/* Set GPGME home directory for the OpenPGP engine only */
308
/* Set GPGME home directory for the OpenPGP engine only */
224
309
rc = gpgme_get_engine_info(&engine_info);
225
310
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
311
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
312
gpgme_strsource(rc), gpgme_strerror(rc));
228
313
return false;
229
314
}
230
315
while(engine_info != NULL){
236
321
engine_info = engine_info->next;
237
322
}
238
323
if(engine_info == NULL){
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
324
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
325
tempdir);
240
326
return false;
241
327
}
242
328
243
329
/* Create new GPGME "context" */
244
330
rc = gpgme_new(&(mc.ctx));
245
331
if(rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
334
gpgme_strerror(rc));
248
335
return false;
249
336
}
250
337
269
356
ssize_t plaintext_length = 0;
270
357
271
358
if(debug){
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
359
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
360
}
274
361
275
362
/* Create new GPGME data buffer from memory cryptotext */
276
363
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
277
364
0);
278
365
if(rc != GPG_ERR_NO_ERROR){
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
366
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
281
368
return -1;
282
369
}
283
370
284
371
/* Create new empty GPGME data buffer for the plaintext */
285
372
rc = gpgme_data_new(&dh_plain);
286
373
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
374
fprintf_plus(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_data_new: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
289
377
gpgme_data_release(dh_crypto);
290
378
return -1;
291
379
}
294
382
data buffer */
295
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
296
384
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
gpgme_strsource(rc), gpgme_strerror(rc));
299
387
plaintext_length = -1;
300
388
if(debug){
301
389
gpgme_decrypt_result_t result;
302
390
result = gpgme_op_decrypt_result(mc.ctx);
303
391
if(result == NULL){
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
393
} else {
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
394
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
395
result->unsupported_algorithm);
396
fprintf_plus(stderr, "Wrong key usage: %u\n",
397
result->wrong_key_usage);
310
398
if(result->file_name != NULL){
311
fprintf(stderr, "File name: %s\n", result->file_name);
399
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
400
}
313
401
gpgme_recipient_t recipient;
314
402
recipient = result->recipients;
315
403
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
404
fprintf_plus(stderr, "Public key algorithm: %s\n",
405
gpgme_pubkey_algo_name
406
(recipient->pubkey_algo));
407
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
408
fprintf_plus(stderr, "Secret key available: %s\n",
409
recipient->status == GPG_ERR_NO_SECKEY
410
? "No" : "Yes");
322
411
recipient = recipient->next;
323
412
}
324
413
}
327
416
}
328
417
329
418
if(debug){
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
419
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
420
}
332
421
333
422
/* Seek back to the beginning of the GPGME plaintext data buffer */
334
423
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
335
perror("gpgme_data_seek");
424
perror_plus("gpgme_data_seek");
336
425
plaintext_length = -1;
337
426
goto decrypt_end;
338
427
}
340
429
*plaintext = NULL;
341
430
while(true){
342
431
plaintext_capacity = incbuffer(plaintext,
343
(size_t)plaintext_length,
344
plaintext_capacity);
432
(size_t)plaintext_length,
433
plaintext_capacity);
345
434
if(plaintext_capacity == 0){
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
435
perror_plus("incbuffer");
436
plaintext_length = -1;
437
goto decrypt_end;
349
438
}
350
439
351
440
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
445
break;
357
446
}
358
447
if(ret < 0){
359
perror("gpgme_data_read");
448
perror_plus("gpgme_data_read");
360
449
plaintext_length = -1;
361
450
goto decrypt_end;
362
451
}
364
453
}
365
454
366
455
if(debug){
367
fprintf(stderr, "Decrypted password is: ");
456
fprintf_plus(stderr, "Decrypted password is: ");
368
457
for(ssize_t i = 0; i < plaintext_length; i++){
369
458
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
370
459
}
392
481
/* GnuTLS log function callback */
393
482
static void debuggnutls(__attribute__((unused)) int level,
394
483
const char* string){
395
fprintf(stderr, "GnuTLS: %s", string);
484
fprintf_plus(stderr, "GnuTLS: %s", string);
396
485
}
397
486
398
487
static int init_gnutls_global(const char *pubkeyfilename,
400
489
int ret;
401
490
402
491
if(debug){
403
fprintf(stderr, "Initializing GnuTLS\n");
492
fprintf_plus(stderr, "Initializing GnuTLS\n");
404
493
}
405
494
406
495
ret = gnutls_global_init();
407
496
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
410
499
return -1;
411
500
}
412
501
419
508
}
420
509
421
510
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
423
512
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
safer_gnutls_strerror(ret));
429
515
gnutls_global_deinit();
430
516
return -1;
431
517
}
432
518
433
519
if(debug){
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
520
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n",
522
pubkeyfilename,
523
seckeyfilename);
437
524
}
438
525
439
526
ret = gnutls_certificate_set_openpgp_key_file
440
527
(mc.cred, pubkeyfilename, seckeyfilename,
441
528
GNUTLS_OPENPGP_FMT_BASE64);
442
529
if(ret != GNUTLS_E_SUCCESS){
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
530
fprintf_plus(stderr,
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
534
safer_gnutls_strerror(ret));
448
535
goto globalfail;
449
536
}
450
537
451
538
/* GnuTLS server initialization */
452
539
ret = gnutls_dh_params_init(&mc.dh_params);
453
540
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
" initialization: %s\n",
543
safer_gnutls_strerror(ret));
456
544
goto globalfail;
457
545
}
458
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
547
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
462
550
goto globalfail;
463
551
}
464
552
484
572
}
485
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
574
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
575
fprintf_plus(stderr,
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
489
578
}
490
579
491
580
{
498
587
}
499
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
589
if(ret != GNUTLS_E_SUCCESS){
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
590
fprintf_plus(stderr, "Syntax error at: %s\n", err);
591
fprintf_plus(stderr, "GnuTLS error: %s\n",
592
safer_gnutls_strerror(ret));
504
593
gnutls_deinit(*session);
505
594
return -1;
506
595
}
515
604
}
516
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
606
if(ret != GNUTLS_E_SUCCESS){
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
607
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
608
safer_gnutls_strerror(ret));
520
609
gnutls_deinit(*session);
521
610
return -1;
522
611
}
552
641
gnutls_session_t session;
553
642
int pf; /* Protocol family */
554
643
644
errno = 0;
645
555
646
if(quit_now){
647
errno = EINTR;
556
648
return -1;
557
649
}
558
650
564
656
pf = PF_INET;
565
657
break;
566
658
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
659
fprintf_plus(stderr, "Bad address family: %d\n", af);
660
errno = EINVAL;
568
661
return -1;
569
662
}
570
663
574
667
}
575
668
576
669
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
579
672
}
580
673
581
674
tcp_sd = socket(pf, SOCK_STREAM, 0);
582
675
if(tcp_sd < 0){
583
perror("socket");
676
int e = errno;
677
perror_plus("socket");
678
errno = e;
584
679
goto mandos_end;
585
680
}
586
681
587
682
if(quit_now){
683
errno = EINTR;
588
684
goto mandos_end;
589
685
}
590
686
597
693
ret = inet_pton(af, ip, &to.in.sin_addr);
598
694
}
599
695
if(ret < 0 ){
600
perror("inet_pton");
696
int e = errno;
697
perror_plus("inet_pton");
698
errno = e;
601
699
goto mandos_end;
602
700
}
603
701
if(ret == 0){
604
fprintf(stderr, "Bad address: %s\n", ip);
702
int e = errno;
703
fprintf_plus(stderr, "Bad address: %s\n", ip);
704
errno = e;
605
705
goto mandos_end;
606
706
}
607
707
if(af == AF_INET6){
611
711
612
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
714
-Wunreachable-code*/
615
715
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
716
fprintf_plus(stderr, "An IPv6 link-local address is"
717
" incomplete without a network interface\n");
718
errno = EINVAL;
618
719
goto mandos_end;
619
720
}
620
721
/* Set the network interface number as scope */
627
728
}
628
729
629
730
if(quit_now){
731
errno = EINTR;
630
732
goto mandos_end;
631
733
}
632
734
634
736
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
737
char interface[IF_NAMESIZE];
636
738
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
739
perror_plus("if_indextoname");
638
740
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
641
743
}
642
744
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
645
747
}
646
748
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
749
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
654
756
sizeof(addrstr));
655
757
}
656
758
if(pcret == NULL){
657
perror("inet_ntop");
759
perror_plus("inet_ntop");
658
760
} else {
659
761
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
661
763
}
662
764
}
663
765
}
664
766
665
767
if(quit_now){
768
errno = EINTR;
666
769
goto mandos_end;
667
770
}
668
771
672
775
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
776
}
674
777
if(ret < 0){
675
perror("connect");
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
int e = errno;
780
perror_plus("connect");
781
errno = e;
782
}
676
783
goto mandos_end;
677
784
}
678
785
679
786
if(quit_now){
787
errno = EINTR;
680
788
goto mandos_end;
681
789
}
682
790
685
793
while(true){
686
794
size_t out_size = strlen(out);
687
795
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
688
out_size - written));
796
out_size - written));
689
797
if(ret == -1){
690
perror("write");
798
int e = errno;
799
perror_plus("write");
800
errno = e;
691
801
goto mandos_end;
692
802
}
693
803
written += (size_t)ret;
703
813
}
704
814
705
815
if(quit_now){
816
errno = EINTR;
706
817
goto mandos_end;
707
818
}
708
819
}
709
820
710
821
if(debug){
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
822
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
823
}
713
824
714
825
if(quit_now){
826
errno = EINTR;
715
827
goto mandos_end;
716
828
}
717
829
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
830
/* This casting via intptr_t is to eliminate warning about casting
831
an int to a pointer type. This is exactly how the GnuTLS Guile
832
function "set-session-transport-fd!" does it. */
833
gnutls_transport_set_ptr(session,
834
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
719
835
720
836
if(quit_now){
837
errno = EINTR;
721
838
goto mandos_end;
722
839
}
723
840
724
841
do {
725
842
ret = gnutls_handshake(session);
726
843
if(quit_now){
844
errno = EINTR;
727
845
goto mandos_end;
728
846
}
729
847
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
848
731
849
if(ret != GNUTLS_E_SUCCESS){
732
850
if(debug){
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
851
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
852
gnutls_perror(ret);
735
853
}
854
errno = EPROTO;
736
855
goto mandos_end;
737
856
}
738
857
739
858
/* Read OpenPGP packet that contains the wanted password */
740
859
741
860
if(debug){
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
861
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
862
" %s\n", ip);
744
863
}
745
864
746
865
while(true){
747
866
748
867
if(quit_now){
868
errno = EINTR;
749
869
goto mandos_end;
750
870
}
751
871
752
872
buffer_capacity = incbuffer(&buffer, buffer_length,
753
buffer_capacity);
873
buffer_capacity);
754
874
if(buffer_capacity == 0){
755
perror("incbuffer");
875
int e = errno;
876
perror_plus("incbuffer");
877
errno = e;
756
878
goto mandos_end;
757
879
}
758
880
759
881
if(quit_now){
882
errno = EINTR;
760
883
goto mandos_end;
761
884
}
762
885
775
898
ret = gnutls_handshake(session);
776
899
777
900
if(quit_now){
901
errno = EINTR;
778
902
goto mandos_end;
779
903
}
780
904
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
781
905
if(ret < 0){
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
906
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
907
"***\n");
783
908
gnutls_perror(ret);
909
errno = EPROTO;
784
910
goto mandos_end;
785
911
}
786
912
break;
787
913
default:
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
914
fprintf_plus(stderr, "Unknown error while reading data from"
915
" encrypted session with Mandos server\n");
790
916
gnutls_bye(session, GNUTLS_SHUT_RDWR);
917
errno = EIO;
791
918
goto mandos_end;
792
919
}
793
920
} else {
796
923
}
797
924
798
925
if(debug){
799
fprintf(stderr, "Closing TLS session\n");
926
fprintf_plus(stderr, "Closing TLS session\n");
800
927
}
801
928
802
929
if(quit_now){
930
errno = EINTR;
803
931
goto mandos_end;
804
932
}
805
933
806
934
do {
807
935
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
936
if(quit_now){
937
errno = EINTR;
809
938
goto mandos_end;
810
939
}
811
940
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
941
813
942
if(buffer_length > 0){
814
943
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
944
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
817
945
&decrypted_buffer);
818
946
if(decrypted_buffer_size >= 0){
819
947
820
948
written = 0;
821
949
while(written < (size_t) decrypted_buffer_size){
822
950
if(quit_now){
951
errno = EINTR;
823
952
goto mandos_end;
824
953
}
825
954
827
956
(size_t)decrypted_buffer_size - written,
828
957
stdout);
829
958
if(ret == 0 and ferror(stdout)){
959
int e = errno;
830
960
if(debug){
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
961
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
962
strerror(errno));
833
963
}
964
errno = e;
834
965
goto mandos_end;
835
966
}
836
967
written += (size_t)ret;
842
973
/* Shutdown procedure */
843
974
844
975
mandos_end:
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
976
{
977
int e = errno;
978
free(decrypted_buffer);
979
free(buffer);
980
if(tcp_sd >= 0){
981
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
982
}
983
if(ret == -1){
984
if(e == 0){
985
e = errno;
986
}
987
perror_plus("close");
988
}
989
gnutls_deinit(session);
990
errno = e;
991
if(quit_now){
992
errno = EINTR;
993
retval = -1;
994
}
856
995
}
857
996
return retval;
858
997
}
883
1022
switch(event){
884
1023
default:
885
1024
case AVAHI_RESOLVER_FAILURE:
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
889
1029
break;
890
1030
891
1031
case AVAHI_RESOLVER_FOUND:
893
1033
char ip[AVAHI_ADDRESS_STR_MAX];
894
1034
avahi_address_snprint(ip, sizeof(ip), address);
895
1035
if(debug){
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1036
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
host_name, ip, (intmax_t)interface, port);
899
1039
}
900
1040
int ret = start_mandos_communication(ip, port, interface,
901
1041
avahi_proto_to_af(proto));
902
1042
if(ret == 0){
903
1043
avahi_simple_poll_quit(mc.simple_poll);
1044
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
" list\n", name);
1049
}
904
1050
}
905
1051
}
906
1052
}
930
1076
default:
931
1077
case AVAHI_BROWSER_FAILURE:
932
1078
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
935
1081
avahi_simple_poll_quit(mc.simple_poll);
936
1082
return;
937
1083
944
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
1091
name, type, domain, protocol, 0,
946
1092
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
949
1096
break;
950
1097
951
1098
case AVAHI_BROWSER_REMOVE:
954
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
955
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
956
1103
if(debug){
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
958
1106
}
959
1107
break;
960
1108
}
961
1109
}
962
1110
963
/* stop main loop after sigterm has been called */
1111
/* Signal handler that stops main loop after SIGTERM */
964
1112
static void handle_sigterm(int sig){
965
1113
if(quit_now){
966
1114
return;
968
1116
quit_now = 1;
969
1117
signal_received = sig;
970
1118
int old_errno = errno;
1119
/* set main loop to exit */
971
1120
if(mc.simple_poll != NULL){
972
1121
avahi_simple_poll_quit(mc.simple_poll);
973
1122
}
974
1123
errno = old_errno;
975
1124
}
976
1125
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
/*
1193
* This function determines if a directory entry in /sys/class/net
1194
* corresponds to an acceptable network device.
1195
* (This function is passed to scandir(3) as a filter function.)
1196
*/
1197
int good_interface(const struct dirent *if_entry){
1198
if(if_entry->d_name[0] == '.'){
1199
return 0;
1200
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1461
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1532
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
1569
}
1570
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1577
struct ifreq network;
1578
unsigned int if_index = if_nametoindex(interface);
1579
if(if_index == 0){
1580
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1581
errno = old_errno;
1582
return ENXIO;
1583
}
1584
1585
if(quit_now){
1586
errno = old_errno;
1587
return EINTR;
1588
}
1589
1590
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1592
ret_errno = errno;
1593
fprintf_plus(stderr, "Failed to get flags for interface "
1594
"\"%s\"\n", interface);
1595
return ret_errno;
1596
}
1597
network.ifr_flags |= IFF_UP;
1598
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1601
ret_errno = errno;
1602
perror_plus("socket");
1603
errno = old_errno;
1604
return ret_errno;
1605
}
1606
1607
if(quit_now){
1608
close(sd);
1609
errno = old_errno;
1610
return EINTR;
1611
}
1612
1613
if(debug){
1614
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1615
interface);
1616
}
1617
1618
/* Raise priviliges */
1619
raise_privileges();
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1633
#ifdef __linux__
1634
if(restore_loglevel){
1635
ret_linux = klogctl(7, NULL, 0);
1636
if(ret_linux == -1){
1637
perror_plus("klogctl");
1638
}
1639
}
1640
#endif /* __linux__ */
1641
1642
/* Lower privileges */
1643
lower_privileges();
1644
1645
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1647
if(ret == -1){
1648
perror_plus("close");
1649
}
1650
1651
if(ret_setflags == -1){
1652
errno = ret_errno;
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
errno = old_errno;
1655
return ret_errno;
1656
}
1657
} else if(debug){
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1659
interface);
1660
}
1661
1662
/* Sleep checking until interface is running.
1663
Check every 0.25s, up to total time of delay */
1664
for(int i=0; i < delay * 4; i++){
1665
if(interface_is_running(interface)){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
1675
errno = old_errno;
1676
return 0;
1677
}
1678
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
if(interface_is_up(interface)){
1692
if(not get_flags(interface, &network) and debug){
1693
ret_errno = errno;
1694
fprintf_plus(stderr, "Failed to get flags for interface "
1695
"\"%s\"\n", interface);
1696
return ret_errno;
1697
}
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1702
ret_errno = errno;
1703
perror_plus("socket");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
1708
if(debug){
1709
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1710
interface);
1711
}
1712
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1721
1722
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
if(ret == -1){
1725
perror_plus("close");
1726
}
1727
1728
if(ret_setflags == -1){
1729
errno = ret_errno;
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
} else if(debug){
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1736
interface);
1737
}
1738
1739
errno = old_errno;
1740
return 0;
1741
}
1742
977
1743
int main(int argc, char *argv[]){
978
1744
AvahiSServiceBrowser *sb = NULL;
979
int error;
1745
error_t ret_errno;
980
1746
int ret;
981
1747
intmax_t tmpmax;
982
1748
char *tmp;
983
1749
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
char *interfaces_to_take_down = NULL;
1753
size_t interfaces_to_take_down_size = 0;
991
1754
char tempdir[] = "/tmp/mandosXXXXXX";
992
1755
bool tempdir_created = false;
993
1756
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
1757
const char *seckey = PATHDIR "/" SECKEY;
995
1758
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
996
1761
997
1762
bool gnutls_initialized = false;
998
1763
bool gpgme_initialized = false;
999
1764
float delay = 2.5f;
1765
double retry_interval = 10; /* 10s between trying a server and
1766
retrying the same server again */
1000
1767
1001
1768
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
1769
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1008
1775
errno = 0;
1009
1776
ret = setgid(gid);
1010
1777
if(ret == -1){
1011
perror("setgid");
1778
perror_plus("setgid");
1012
1779
}
1013
1780
1014
1781
/* Lower user privileges (temporarily) */
1015
1782
errno = 0;
1016
1783
ret = seteuid(uid);
1017
1784
if(ret == -1){
1018
perror("seteuid");
1785
perror_plus("seteuid");
1019
1786
}
1020
1787
1021
1788
if(quit_now){
1056
1823
.arg = "SECONDS",
1057
1824
.doc = "Maximum delay to wait for interface startup",
1058
1825
.group = 2 },
1826
{ .name = "retry", .key = 132,
1827
.arg = "SECONDS",
1828
.doc = "Retry interval used when denied by the Mandos server",
1829
.group = 2 },
1830
{ .name = "network-hook-dir", .key = 133,
1831
.arg = "DIR",
1832
.doc = "Directory where network hooks are located",
1833
.group = 2 },
1834
/*
1835
* These reproduce what we would get without ARGP_NO_HELP
1836
*/
1837
{ .name = "help", .key = '?',
1838
.doc = "Give this help list", .group = -1 },
1839
{ .name = "usage", .key = -3,
1840
.doc = "Give a short usage message", .group = -1 },
1841
{ .name = "version", .key = 'V',
1842
.doc = "Print program version", .group = -1 },
1059
1843
{ .name = NULL }
1060
1844
};
1061
1845
1062
1846
error_t parse_opt(int key, char *arg,
1063
1847
struct argp_state *state){
1848
errno = 0;
1064
1849
switch(key){
1065
1850
case 128: /* --debug */
1066
1851
debug = true;
1069
1854
connect_to = arg;
1070
1855
break;
1071
1856
case 'i': /* --interface */
1072
interface = arg;
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1859
if(ret_errno != 0){
1860
argp_error(state, "%s", strerror(ret_errno));
1861
}
1073
1862
break;
1074
1863
case 's': /* --seckey */
1075
1864
seckey = arg;
1082
1871
tmpmax = strtoimax(arg, &tmp, 10);
1083
1872
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
1873
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1874
argp_error(state, "Bad number of DH bits");
1087
1875
}
1088
1876
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
1877
break;
1094
1882
errno = 0;
1095
1883
delay = strtof(arg, &tmp);
1096
1884
if(errno != 0 or tmp == arg or *tmp != '\0'){
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
1885
argp_error(state, "Bad delay");
1886
}
1887
case 132: /* --retry */
1888
errno = 0;
1889
retry_interval = strtod(arg, &tmp);
1890
if(errno != 0 or tmp == arg or *tmp != '\0'
1891
or (retry_interval * 1000) > INT_MAX
1892
or retry_interval < 0){
1893
argp_error(state, "Bad retry interval");
1894
}
1895
break;
1896
case 133: /* --network-hook-dir */
1897
hookdir = arg;
1898
break;
1899
/*
1900
* These reproduce what we would get without ARGP_NO_HELP
1901
*/
1902
case '?': /* --help */
1903
argp_state_help(state, state->out_stream,
1904
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1905
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1906
case -3: /* --usage */
1907
argp_state_help(state, state->out_stream,
1908
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1909
case 'V': /* --version */
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1911
exit(argp_err_exit_status);
1104
1912
break;
1105
1913
default:
1106
1914
return ARGP_ERR_UNKNOWN;
1107
1915
}
1108
return 0;
1916
return errno;
1109
1917
}
1110
1918
1111
1919
struct argp argp = { .options = options, .parser = parse_opt,
1112
1920
.args_doc = "",
1113
1921
.doc = "Mandos client -- Get and decrypt"
1114
1922
" passwords from a Mandos server" };
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1923
ret = argp_parse(&argp, argc, argv,
1924
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1925
switch(ret){
1926
case 0:
1927
break;
1928
case ENOMEM:
1929
default:
1930
errno = ret;
1931
perror_plus("argp_parse");
1932
exitcode = EX_OSERR;
1933
goto end;
1934
case EINVAL:
1935
exitcode = EX_USAGE;
1936
goto end;
1937
}
1938
}
1939
1940
{
1941
/* Work around Debian bug #633582:
1942
<http://bugs.debian.org/633582> */
1943
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
1946
struct stat st;
1947
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1949
int seckey_fd = open(seckey, O_RDONLY);
1950
if(seckey_fd == -1){
1951
perror_plus("open");
1952
} else {
1953
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1954
if(ret == -1){
1955
perror_plus("fstat");
1956
} else {
1957
if(S_ISREG(st.st_mode)
1958
and st.st_uid == 0 and st.st_gid == 0){
1959
ret = fchown(seckey_fd, uid, gid);
1960
if(ret == -1){
1961
perror_plus("fchown");
1962
}
1963
}
1964
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
}
1967
}
1968
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
int pubkey_fd = open(pubkey, O_RDONLY);
1971
if(pubkey_fd == -1){
1972
perror_plus("open");
1973
} else {
1974
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1975
if(ret == -1){
1976
perror_plus("fstat");
1977
} else {
1978
if(S_ISREG(st.st_mode)
1979
and st.st_uid == 0 and st.st_gid == 0){
1980
ret = fchown(pubkey_fd, uid, gid);
1981
if(ret == -1){
1982
perror_plus("fchown");
1983
}
1984
}
1985
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
1990
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
1995
}
1996
}
1997
}
1998
1999
/* Remove empty interface names */
2000
{
2001
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2003
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2007
" \"%s\"\n", interface);
2008
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2010
interface = NULL;
2011
}
2012
}
2013
}
2014
2015
/* Run network hooks */
2016
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
1119
2026
goto end;
1120
2027
}
1121
2028
}
1130
2037
srand((unsigned int) time(NULL));
1131
2038
mc.simple_poll = avahi_simple_poll_new();
1132
2039
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
2042
exitcode = EX_UNAVAILABLE;
1135
2043
goto end;
1136
2044
}
1137
2045
1138
2046
sigemptyset(&sigterm_action.sa_mask);
1139
2047
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
2048
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2049
perror_plus("sigaddset");
2050
exitcode = EX_OSERR;
1143
2051
goto end;
1144
2052
}
1145
2053
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
2054
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2055
perror_plus("sigaddset");
2056
exitcode = EX_OSERR;
1149
2057
goto end;
1150
2058
}
1151
2059
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
2060
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2061
perror_plus("sigaddset");
2062
exitcode = EX_OSERR;
1155
2063
goto end;
1156
2064
}
1157
2065
/* Need to check if the handler is SIG_IGN before handling:
1160
2068
*/
1161
2069
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
2070
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2071
perror_plus("sigaction");
2072
return EX_OSERR;
1165
2073
}
1166
2074
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
2075
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
2076
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2077
perror_plus("sigaction");
2078
exitcode = EX_OSERR;
1171
2079
goto end;
1172
2080
}
1173
2081
}
1174
2082
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
2083
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2084
perror_plus("sigaction");
2085
return EX_OSERR;
1178
2086
}
1179
2087
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
2088
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
2089
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2090
perror_plus("sigaction");
2091
exitcode = EX_OSERR;
1184
2092
goto end;
1185
2093
}
1186
2094
}
1187
2095
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
2096
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2097
perror_plus("sigaction");
2098
return EX_OSERR;
1191
2099
}
1192
2100
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
2101
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
2102
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
2103
perror_plus("sigaction");
2104
exitcode = EX_OSERR;
1197
2105
goto end;
1198
2106
}
1199
2107
}
1200
2108
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
1286
}
1287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
break;
1305
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
2109
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2112
/* Look for any good interfaces */
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2114
alphasort);
2115
if(ret >= 1){
2116
/* Add all found interfaces to interfaces list */
2117
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2119
direntries[i]->d_name);
2120
if(ret_errno != 0){
2121
perror_plus("argz_add");
2122
continue;
2123
}
2124
if(debug){
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
direntries[i]->d_name);
2127
}
2128
}
2129
free(direntries);
1336
2130
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
2131
free(direntries);
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2133
exitcode = EXIT_FAILURE;
2134
goto end;
2135
}
2136
}
2137
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2150
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2152
interface))){
2153
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2155
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2159
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2163
}
1341
2164
}
1342
2165
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
if(debug and (interfaces_to_take_down == NULL)){
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
}
1343
2172
}
1344
2173
1345
2174
if(quit_now){
1348
2177
1349
2178
ret = init_gnutls_global(pubkey, seckey);
1350
2179
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
2181
exitcode = EX_UNAVAILABLE;
1353
2182
goto end;
1354
2183
} else {
1355
2184
gnutls_initialized = true;
1359
2188
goto end;
1360
2189
}
1361
2190
2191
if(mkdtemp(tempdir) == NULL){
2192
perror_plus("mkdtemp");
2193
goto end;
2194
}
1362
2195
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
1366
goto end;
1367
}
1368
2196
1369
2197
if(quit_now){
1370
2198
goto end;
1371
2199
}
1372
2200
1373
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2202
fprintf_plus(stderr, "init_gpgme failed\n");
2203
exitcode = EX_UNAVAILABLE;
1376
2204
goto end;
1377
2205
} else {
1378
2206
gpgme_initialized = true;
1386
2214
/* Connect directly, do not use Zeroconf */
1387
2215
/* (Mainly meant for debugging) */
1388
2216
char *address = strrchr(connect_to, ':');
2217
1389
2218
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2219
fprintf_plus(stderr, "No colon in address\n");
2220
exitcode = EX_USAGE;
1392
2221
goto end;
1393
2222
}
1394
2223
1401
2230
tmpmax = strtoimax(address+1, &tmp, 10);
1402
2231
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
2232
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2233
fprintf_plus(stderr, "Bad port number\n");
2234
exitcode = EX_USAGE;
1406
2235
goto end;
1407
2236
}
1408
2237
1412
2241
1413
2242
port = (uint16_t)tmpmax;
1414
2243
*address = '\0';
1415
address = connect_to;
1416
2244
/* Colon in address indicates IPv6 */
1417
2245
int af;
1418
if(strchr(address, ':') != NULL){
2246
if(strchr(connect_to, ':') != NULL){
1419
2247
af = AF_INET6;
2248
/* Accept [] around IPv6 address - see RFC 5952 */
2249
if(connect_to[0] == '[' and address[-1] == ']')
2250
{
2251
connect_to++;
2252
address[-1] = '\0';
2253
}
1420
2254
} else {
1421
2255
af = AF_INET;
1422
2256
}
2257
address = connect_to;
1423
2258
1424
2259
if(quit_now){
1425
2260
goto end;
1426
2261
}
1427
2262
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2263
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2265
if(quit_now or ret == 0){
2266
break;
2267
}
2268
if(debug){
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
(int)retry_interval);
2271
}
2272
sleep((int)retry_interval);
2273
}
2274
2275
if (not quit_now){
1432
2276
exitcode = EXIT_SUCCESS;
1433
2277
}
2278
1434
2279
goto end;
1435
2280
}
1436
2281
1450
2295
/* Allocate a new server */
1451
2296
mc.server = avahi_server_new(avahi_simple_poll_get
1452
2297
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2298
NULL, &ret_errno);
1454
2299
1455
2300
/* Free the Avahi configuration data */
1456
2301
avahi_server_config_free(&config);
1458
2303
1459
2304
/* Check if creating the Avahi server object succeeded */
1460
2305
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
2308
exitcode = EX_UNAVAILABLE;
1464
2309
goto end;
1465
2310
}
1466
2311
1473
2318
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
2319
NULL, 0, browse_callback, NULL);
1475
2320
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
avahi_strerror(avahi_server_errno(mc.server)));
2323
exitcode = EX_UNAVAILABLE;
1479
2324
goto end;
1480
2325
}
1481
2326
1486
2331
/* Run the main loop */
1487
2332
1488
2333
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2339
if(debug){
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
(ret == 0) ? "successfully" : "with error");
2342
}
1493
2343
1494
2344
end:
1495
2345
1496
2346
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1498
2348
}
1499
2349
1500
2350
/* Cleanup things */
1517
2367
gpgme_release(mc.ctx);
1518
2368
}
1519
2369
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
2370
/* Cleans up the circular linked list of Mandos servers the client
2371
has seen */
2372
if(mc.current_server != NULL){
2373
mc.current_server->prev->next = NULL;
2374
while(mc.current_server != NULL){
2375
server *next = mc.current_server->next;
2376
free(mc.current_server);
2377
mc.current_server = next;
1527
2378
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
2379
}
2380
2381
/* Re-raise priviliges */
2382
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
1537
2398
}
1538
2399
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
1548
2403
}
1549
2404
}
2405
2406
lower_privileges_permanently();
1550
2407
}
1551
2408
1552
/* Removes the temp directory used by GPGME */
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2412
/* Removes the GPGME temp directory and all files inside */
1553
2413
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
2414
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
direntry = direntries[i];
1574
2421
char *fullname = NULL;
1575
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
2423
direntry->d_name);
1577
2424
if(ret < 0){
1578
perror("asprintf");
2425
perror_plus("asprintf");
1579
2426
continue;
1580
2427
}
1581
2428
ret = remove(fullname);
1582
2429
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
1585
2432
}
1586
2433
free(fullname);
1587
2434
}
1588
closedir(d);
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
1589
2441
}
1590
2442
ret = rmdir(tempdir);
1591
2443
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
2444
perror_plus("rmdir");
1593
2445
}
1594
2446
}
1595
2447
1600
2452
&old_sigterm_action,
1601
2453
NULL));
1602
2454
if(ret == -1){
1603
perror("sigaction");
2455
perror_plus("sigaction");
1604
2456
}
1605
2457
do {
1606
2458
ret = raise(signal_received);
1607
2459
} while(ret != 0 and errno == EINTR);
1608
2460
if(ret != 0){
1609
perror("raise");
2461
perror_plus("raise");
1610
2462
abort();
1611
2463
}
1612
2464
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0