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- Committer: Teddy Hogeborn
- Date: 2009-05-17 00:50:09 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 343.
- Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
- files removed:
- DBUS-API
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
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
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
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() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
90
85
91
86
#ifdef __linux__
92
87
#include <sys/klog.h> /* klogctl() */
125
120
#define PATHDIR "/conf/conf.d/mandos"
126
121
#define SECKEY "seckey.txt"
127
122
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
123
130
124
bool debug = false;
131
125
static const char mandos_protocol_version[] = "1";
132
126
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
128
149
129
/* Used for passing in values through the Avahi callback functions */
150
130
typedef struct {
155
135
gnutls_dh_params_t dh_params;
156
136
const char *priority;
157
137
gpgme_ctx_t ctx;
158
server *current_server;
159
138
} mandos_context;
160
139
161
140
/* global context so signal handler can reach it*/
162
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
142
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
176
144
177
145
/*
178
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
191
159
return buffer_capacity;
192
160
}
193
161
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
198
int ret;
199
server *new_server = malloc(sizeof(server));
200
if(new_server == NULL){
201
perror_plus("malloc");
202
return -1;
203
}
204
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
208
if(new_server->ip == NULL){
209
perror_plus("strdup");
210
return -1;
211
}
212
/* Special case of first server */
213
if (mc.current_server == NULL){
214
new_server->next = new_server;
215
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
218
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
221
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
230
}
231
232
162
/*
233
163
* Initialize GPGME.
234
164
*/
235
165
static bool init_gpgme(const char *seckey,
236
166
const char *pubkey, const char *tempdir){
167
int ret;
237
168
gpgme_error_t rc;
238
169
gpgme_engine_info_t engine_info;
239
170
242
173
* Helper function to insert pub and seckey to the engine keyring.
243
174
*/
244
175
bool import_key(const char *filename){
245
int ret;
246
176
int fd;
247
177
gpgme_data_t pgp_data;
248
178
249
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
250
180
if(fd == -1){
251
perror_plus("open");
181
perror("open");
252
182
return false;
253
183
}
254
184
255
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
186
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
259
188
gpgme_strsource(rc), gpgme_strerror(rc));
260
189
return false;
261
190
}
262
191
263
192
rc = gpgme_op_import(mc.ctx, pgp_data);
264
193
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
267
195
gpgme_strsource(rc), gpgme_strerror(rc));
268
196
return false;
269
197
}
270
198
271
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
272
200
if(ret == -1){
273
perror_plus("close");
201
perror("close");
274
202
}
275
203
gpgme_data_release(pgp_data);
276
204
return true;
277
205
}
278
206
279
207
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
282
209
}
283
210
284
211
/* Init GPGME */
285
212
gpgme_check_version(NULL);
286
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
214
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
290
216
gpgme_strsource(rc), gpgme_strerror(rc));
291
217
return false;
292
218
}
293
219
294
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
295
221
rc = gpgme_get_engine_info(&engine_info);
296
222
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
224
gpgme_strsource(rc), gpgme_strerror(rc));
300
225
return false;
301
226
}
308
233
engine_info = engine_info->next;
309
234
}
310
235
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
313
237
return false;
314
238
}
315
239
316
240
/* Create new GPGME "context" */
317
241
rc = gpgme_new(&(mc.ctx));
318
242
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
322
245
return false;
323
246
}
324
247
326
249
return false;
327
250
}
328
251
329
return true;
252
return true;
330
253
}
331
254
332
255
/*
343
266
ssize_t plaintext_length = 0;
344
267
345
268
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
348
270
}
349
271
350
272
/* Create new GPGME data buffer from memory cryptotext */
351
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
274
0);
353
275
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
356
277
gpgme_strsource(rc), gpgme_strerror(rc));
357
278
return -1;
358
279
}
360
281
/* Create new empty GPGME data buffer for the plaintext */
361
282
rc = gpgme_data_new(&dh_plain);
362
283
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
365
285
gpgme_strsource(rc), gpgme_strerror(rc));
366
286
gpgme_data_release(dh_crypto);
367
287
return -1;
371
291
data buffer */
372
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
373
293
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
295
gpgme_strsource(rc), gpgme_strerror(rc));
377
296
plaintext_length = -1;
378
297
if(debug){
379
298
gpgme_decrypt_result_t result;
380
299
result = gpgme_op_decrypt_result(mc.ctx);
381
300
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
302
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
303
fprintf(stderr, "Unsupported algorithm: %s\n",
387
304
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
305
fprintf(stderr, "Wrong key usage: %u\n",
390
306
result->wrong_key_usage);
391
307
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
394
309
}
395
310
gpgme_recipient_t recipient;
396
311
recipient = result->recipients;
397
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
408
322
}
409
323
}
410
324
}
412
326
}
413
327
414
328
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
330
}
418
331
419
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
422
335
plaintext_length = -1;
423
336
goto decrypt_end;
424
337
}
429
342
(size_t)plaintext_length,
430
343
plaintext_capacity);
431
344
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
345
perror("incbuffer");
433
346
plaintext_length = -1;
434
347
goto decrypt_end;
435
348
}
442
355
break;
443
356
}
444
357
if(ret < 0){
445
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
446
359
plaintext_length = -1;
447
360
goto decrypt_end;
448
361
}
450
363
}
451
364
452
365
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
366
fprintf(stderr, "Decrypted password is: ");
455
367
for(ssize_t i = 0; i < plaintext_length; i++){
456
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
369
}
479
391
/* GnuTLS log function callback */
480
392
static void debuggnutls(__attribute__((unused)) int level,
481
393
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
394
fprintf(stderr, "GnuTLS: %s", string);
483
395
}
484
396
485
397
static int init_gnutls_global(const char *pubkeyfilename,
487
399
int ret;
488
400
489
401
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
402
fprintf(stderr, "Initializing GnuTLS\n");
492
403
}
493
404
494
405
ret = gnutls_global_init();
495
406
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
498
409
return -1;
499
410
}
500
411
507
418
}
508
419
509
420
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
511
422
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
514
428
gnutls_global_deinit();
515
429
return -1;
516
430
}
517
431
518
432
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
521
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
435
seckeyfilename);
523
436
}
527
440
GNUTLS_OPENPGP_FMT_BASE64);
528
441
if(ret != GNUTLS_E_SUCCESS){
529
442
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
535
447
goto globalfail;
536
448
}
537
449
538
450
/* GnuTLS server initialization */
539
451
ret = gnutls_dh_params_init(&mc.dh_params);
540
452
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
543
454
" %s\n", safer_gnutls_strerror(ret));
544
455
goto globalfail;
545
456
}
546
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
458
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
550
460
safer_gnutls_strerror(ret));
551
461
goto globalfail;
552
462
}
566
476
static int init_gnutls_session(gnutls_session_t *session){
567
477
int ret;
568
478
/* GnuTLS session creation */
569
do {
570
ret = gnutls_init(session, GNUTLS_SERVER);
571
if(quit_now){
572
return -1;
573
}
574
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
575
480
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
578
482
safer_gnutls_strerror(ret));
579
483
}
580
484
581
485
{
582
486
const char *err;
583
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
if(quit_now){
586
gnutls_deinit(*session);
587
return -1;
588
}
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
488
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
595
492
gnutls_deinit(*session);
596
493
return -1;
597
494
}
598
495
}
599
496
600
do {
601
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
603
if(quit_now){
604
gnutls_deinit(*session);
605
return -1;
606
}
607
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
608
499
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
611
501
safer_gnutls_strerror(ret));
612
502
gnutls_deinit(*session);
613
503
return -1;
614
504
}
615
505
616
506
/* ignore client certificate if any. */
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
618
509
619
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
620
511
629
520
static int start_mandos_communication(const char *ip, uint16_t port,
630
521
AvahiIfIndex if_index,
631
522
int af){
632
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
633
524
ssize_t sret;
634
525
union {
635
526
struct sockaddr_in in;
636
527
struct sockaddr_in6 in6;
637
528
} to;
638
529
char *buffer = NULL;
639
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
640
531
size_t buffer_length = 0;
641
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
642
534
size_t written;
643
int retval = -1;
535
int retval = 0;
644
536
gnutls_session_t session;
645
537
int pf; /* Protocol family */
646
538
647
errno = 0;
648
649
if(quit_now){
650
errno = EINTR;
651
return -1;
652
}
653
654
539
switch(af){
655
540
case AF_INET6:
656
541
pf = PF_INET6;
659
544
pf = PF_INET;
660
545
break;
661
546
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
664
errno = EINVAL;
547
fprintf(stderr, "Bad address family: %d\n", af);
665
548
return -1;
666
549
}
667
550
671
554
}
672
555
673
556
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
676
558
"\n", ip, port);
677
559
}
678
560
679
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
562
if(tcp_sd < 0){
681
int e = errno;
682
perror_plus("socket");
683
errno = e;
684
goto mandos_end;
685
}
686
687
if(quit_now){
688
errno = EINTR;
689
goto mandos_end;
563
perror("socket");
564
return -1;
690
565
}
691
566
692
567
memset(&to, 0, sizeof(to));
693
568
if(af == AF_INET6){
694
to.in6.sin6_family = (sa_family_t)af;
569
to.in6.sin6_family = (uint16_t)af;
695
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
696
571
} else { /* IPv4 */
697
572
to.in.sin_family = (sa_family_t)af;
698
573
ret = inet_pton(af, ip, &to.in.sin_addr);
699
574
}
700
575
if(ret < 0 ){
701
int e = errno;
702
perror_plus("inet_pton");
703
errno = e;
704
goto mandos_end;
576
perror("inet_pton");
577
return -1;
705
578
}
706
579
if(ret == 0){
707
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
710
errno = e;
711
goto mandos_end;
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
712
582
}
713
583
if(af == AF_INET6){
714
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
719
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
590
-Wunreachable-code*/
721
591
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
724
593
" without a network interface\n");
725
errno = EINVAL;
726
goto mandos_end;
594
return -1;
727
595
}
728
596
/* Set the network interface number as scope */
729
597
to.in6.sin6_scope_id = (uint32_t)if_index;
734
602
-Wunreachable-code */
735
603
}
736
604
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
605
if(debug){
743
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
744
607
char interface[IF_NAMESIZE];
745
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
perror_plus("if_indextoname");
609
perror("if_indextoname");
747
610
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
750
612
ip, interface, port);
751
613
}
752
614
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
755
617
}
756
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
764
626
sizeof(addrstr));
765
627
}
766
628
if(pcret == NULL){
767
perror_plus("inet_ntop");
629
perror("inet_ntop");
768
630
} else {
769
631
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
772
633
}
773
634
}
774
635
}
775
636
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
637
if(af == AF_INET6){
782
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
639
} else {
784
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
785
641
}
786
642
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
792
goto mandos_end;
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
643
perror("connect");
644
return -1;
798
645
}
799
646
800
647
const char *out = mandos_protocol_version;
804
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
652
out_size - written));
806
653
if(ret == -1){
807
int e = errno;
808
perror_plus("write");
809
errno = e;
654
perror("write");
655
retval = -1;
810
656
goto mandos_end;
811
657
}
812
658
written += (size_t)ret;
820
666
break;
821
667
}
822
668
}
823
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
669
}
829
670
830
671
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
833
}
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
/* Spurious warning from -Wint-to-pointer-cast */
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
841
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
842
676
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
848
do {
677
do{
849
678
ret = gnutls_handshake(session);
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
854
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
855
680
856
681
if(ret != GNUTLS_E_SUCCESS){
857
682
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
860
684
gnutls_perror(ret);
861
685
}
862
errno = EPROTO;
686
retval = -1;
863
687
goto mandos_end;
864
688
}
865
689
866
690
/* Read OpenPGP packet that contains the wanted password */
867
691
868
692
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
871
695
}
872
696
873
697
while(true){
874
875
if(quit_now){
876
errno = EINTR;
877
goto mandos_end;
878
}
879
880
698
buffer_capacity = incbuffer(&buffer, buffer_length,
881
699
buffer_capacity);
882
700
if(buffer_capacity == 0){
883
int e = errno;
884
perror_plus("incbuffer");
885
errno = e;
886
goto mandos_end;
887
}
888
889
if(quit_now){
890
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
891
703
goto mandos_end;
892
704
}
893
705
902
714
case GNUTLS_E_AGAIN:
903
715
break;
904
716
case GNUTLS_E_REHANDSHAKE:
905
do {
717
do{
906
718
ret = gnutls_handshake(session);
907
908
if(quit_now){
909
errno = EINTR;
910
goto mandos_end;
911
}
912
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
720
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
916
722
gnutls_perror(ret);
917
errno = EPROTO;
723
retval = -1;
918
724
goto mandos_end;
919
725
}
920
726
break;
921
727
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
728
fprintf(stderr, "Unknown error while reading data from"
924
729
" encrypted session with Mandos server\n");
730
retval = -1;
925
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
errno = EIO;
927
732
goto mandos_end;
928
733
}
929
734
} else {
932
737
}
933
738
934
739
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
937
}
938
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
do {
945
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
951
744
952
745
if(buffer_length > 0){
953
ssize_t decrypted_buffer_size;
954
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
747
buffer_length,
956
748
&decrypted_buffer);
957
749
if(decrypted_buffer_size >= 0){
958
959
750
written = 0;
960
751
while(written < (size_t) decrypted_buffer_size){
961
if(quit_now){
962
errno = EINTR;
963
goto mandos_end;
964
}
965
966
752
ret = (int)fwrite(decrypted_buffer + written, 1,
967
753
(size_t)decrypted_buffer_size - written,
968
754
stdout);
969
755
if(ret == 0 and ferror(stdout)){
970
int e = errno;
971
756
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
757
fprintf(stderr, "Error writing encrypted data: %s\n",
974
758
strerror(errno));
975
759
}
976
errno = e;
977
goto mandos_end;
760
retval = -1;
761
break;
978
762
}
979
763
written += (size_t)ret;
980
764
}
981
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
982
768
}
769
} else {
770
retval = -1;
983
771
}
984
772
985
773
/* Shutdown procedure */
986
774
987
775
mandos_end:
988
{
989
int e = errno;
990
free(decrypted_buffer);
991
free(buffer);
992
if(tcp_sd >= 0){
993
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
994
}
995
if(ret == -1){
996
if(e == 0){
997
e = errno;
998
}
999
perror_plus("close");
1000
}
1001
gnutls_deinit(session);
1002
errno = e;
1003
if(quit_now){
1004
errno = EINTR;
1005
retval = -1;
1006
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1007
780
}
781
gnutls_deinit(session);
1008
782
return retval;
1009
783
}
1010
784
1027
801
/* Called whenever a service has been resolved successfully or
1028
802
timed out */
1029
803
1030
if(quit_now){
1031
return;
1032
}
1033
1034
804
switch(event){
1035
805
default:
1036
806
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1039
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
809
avahi_strerror(avahi_server_errno(mc.server)));
1041
810
break;
1045
814
char ip[AVAHI_ADDRESS_STR_MAX];
1046
815
avahi_address_snprint(ip, sizeof(ip), address);
1047
816
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1050
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
819
ip, (intmax_t)interface, port);
1052
820
}
1054
822
avahi_proto_to_af(proto));
1055
823
if(ret == 0){
1056
824
avahi_simple_poll_quit(mc.simple_poll);
1057
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1060
825
}
1061
826
}
1062
827
}
1078
843
/* Called whenever a new services becomes available on the LAN or
1079
844
is removed from the LAN */
1080
845
1081
if(quit_now){
1082
return;
1083
}
1084
1085
846
switch(event){
1086
847
default:
1087
848
case AVAHI_BROWSER_FAILURE:
1088
849
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
850
fprintf(stderr, "(Avahi browser) %s\n",
1091
851
avahi_strerror(avahi_server_errno(mc.server)));
1092
852
avahi_simple_poll_quit(mc.simple_poll);
1093
853
return;
1101
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
862
name, type, domain, protocol, 0,
1103
863
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1106
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1107
866
break;
1108
867
1112
871
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
873
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1117
875
}
1118
876
break;
1119
877
}
1120
878
}
1121
879
1122
/* Signal handler that stops main loop after SIGTERM */
1123
static void handle_sigterm(int sig){
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1124
884
if(quit_now){
1125
885
return;
1126
886
}
1127
887
quit_now = 1;
1128
signal_received = sig;
1129
888
int old_errno = errno;
1130
/* set main loop to exit */
1131
889
if(mc.simple_poll != NULL){
1132
890
avahi_simple_poll_quit(mc.simple_poll);
1133
891
}
1134
892
errno = old_errno;
1135
893
}
1136
894
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int ret;
1139
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
if(s < 0){
1142
perror_plus("socket");
1143
return false;
1144
}
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
if(ret == -1){
1148
if(debug){
1149
perror_plus("ioctl SIOCGIFFLAGS");
1150
}
1151
return false;
1152
}
1153
return true;
1154
}
1155
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1158
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1163
}
1164
return false;
1165
}
1166
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1171
}
1172
return true;
1173
}
1174
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1179
}
1180
return false;
1181
}
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1184
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1187
}
1188
return false;
1189
}
1190
1191
/* Accept this device */
1192
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1195
}
1196
return true;
1197
}
1198
1199
/*
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1203
*/
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1206
return 0;
1207
}
1208
1209
struct ifreq ifr;
1210
if(not get_flags(if_entry->d_name, &ifr)){
1211
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1284
int ret;
1285
struct stat st;
1286
1287
if((direntry->d_name)[0] == '\0'){
1288
/* Empty name? */
1289
return 0;
1290
}
1291
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1317
if(ret == -1){
1318
if(debug){
1319
perror_plus("Could not stat plugin");
1320
}
1321
return 0;
1322
}
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1325
return 0;
1326
}
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1329
return 0;
1330
}
1331
return 1;
1332
}
1333
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1335
int ret;
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1339
1340
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1345
}
1346
ret = avahi_simple_poll_iterate(s, -1);
1347
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1352
}
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1355
if(ret == -1){
1356
perror_plus("clock_gettime");
1357
return -1;
1358
}
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1375
}
1376
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1382
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1384
return 0;
1385
}
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1388
if(ret == -1){
1389
perror_plus("clock_gettime");
1390
return -1;
1391
}
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1395
}
1396
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
}
1399
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1402
}
1403
}
1404
}
1405
}
1406
1407
895
int main(int argc, char *argv[]){
1408
896
AvahiSServiceBrowser *sb = NULL;
1409
897
int error;
1411
899
intmax_t tmpmax;
1412
900
char *tmp;
1413
901
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
902
const char *interface = "eth0";
1415
903
struct ifreq network;
1416
int sd = -1;
1417
bool take_down_interface = false;
904
int sd;
1418
905
uid_t uid;
1419
906
gid_t gid;
907
char *connect_to = NULL;
1420
908
char tempdir[] = "/tmp/mandosXXXXXX";
1421
909
bool tempdir_created = false;
1422
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1426
914
bool gnutls_initialized = false;
1427
915
bool gpgme_initialized = false;
1428
916
float delay = 2.5f;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
1431
917
1432
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1433
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1434
920
1435
uid = getuid();
1436
gid = getgid();
1437
1438
/* Lower any group privileges we might have, just to be safe */
1439
errno = 0;
1440
ret = setgid(gid);
1441
if(ret == -1){
1442
perror_plus("setgid");
1443
}
1444
1445
/* Lower user privileges (temporarily) */
1446
errno = 0;
1447
ret = seteuid(uid);
1448
if(ret == -1){
1449
perror_plus("seteuid");
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1456
921
{
1457
922
struct argp_option options[] = {
1458
923
{ .name = "debug", .key = 128,
1487
952
.arg = "SECONDS",
1488
953
.doc = "Maximum delay to wait for interface startup",
1489
954
.group = 2 },
1490
{ .name = "retry", .key = 132,
1491
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1493
.group = 2 },
1494
{ .name = "network-hook-dir", .key = 133,
1495
.arg = "DIR",
1496
.doc = "Directory where network hooks are located",
1497
.group = 2 },
1498
/*
1499
* These reproduce what we would get without ARGP_NO_HELP
1500
*/
1501
{ .name = "help", .key = '?',
1502
.doc = "Give this help list", .group = -1 },
1503
{ .name = "usage", .key = -3,
1504
.doc = "Give a short usage message", .group = -1 },
1505
{ .name = "version", .key = 'V',
1506
.doc = "Print program version", .group = -1 },
1507
955
{ .name = NULL }
1508
956
};
1509
957
1510
958
error_t parse_opt(int key, char *arg,
1511
959
struct argp_state *state){
1512
errno = 0;
1513
960
switch(key){
1514
961
case 128: /* --debug */
1515
962
debug = true;
1531
978
tmpmax = strtoimax(arg, &tmp, 10);
1532
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1533
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1534
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1535
983
}
1536
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1537
985
break;
1542
990
errno = 0;
1543
991
delay = strtof(arg, &tmp);
1544
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1545
argp_error(state, "Bad delay");
1546
}
1547
case 132: /* --retry */
1548
errno = 0;
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1554
}
1555
break;
1556
case 133: /* --network-hook-dir */
1557
hookdir = arg;
1558
break;
1559
/*
1560
* These reproduce what we would get without ARGP_NO_HELP
1561
*/
1562
case '?': /* --help */
1563
argp_state_help(state, state->out_stream,
1564
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1565
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1566
case -3: /* --usage */
1567
argp_state_help(state, state->out_stream,
1568
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
exit(argp_err_exit_status);
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1573
1000
break;
1574
1001
default:
1575
1002
return ARGP_ERR_UNKNOWN;
1576
1003
}
1577
return errno;
1004
return 0;
1578
1005
}
1579
1006
1580
1007
struct argp argp = { .options = options, .parser = parse_opt,
1581
1008
.args_doc = "",
1582
1009
.doc = "Mandos client -- Get and decrypt"
1583
1010
" passwords from a Mandos server" };
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1586
switch(ret){
1587
case 0:
1588
break;
1589
case ENOMEM:
1590
default:
1591
errno = ret;
1592
perror_plus("argp_parse");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
case EINVAL:
1596
exitcode = EX_USAGE;
1597
goto end;
1598
}
1599
}
1600
1601
{
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1752
1016
}
1753
1017
}
1754
1018
1756
1020
avahi_set_log_function(empty_log);
1757
1021
}
1758
1022
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1793
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
1024
from the signal handler */
1795
1025
/* Initialize the pseudo-RNG for Avahi */
1796
1026
srand((unsigned int) time(NULL));
1797
1027
mc.simple_poll = avahi_simple_poll_new();
1798
1028
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1801
exitcode = EX_UNAVAILABLE;
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1802
1031
goto end;
1803
1032
}
1804
1033
1805
1034
sigemptyset(&sigterm_action.sa_mask);
1806
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1807
1036
if(ret == -1){
1808
perror_plus("sigaddset");
1809
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1810
1039
goto end;
1811
1040
}
1812
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1813
1042
if(ret == -1){
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1816
1045
goto end;
1817
1046
}
1818
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1819
1048
if(ret == -1){
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1822
goto end;
1823
}
1824
/* Need to check if the handler is SIG_IGN before handling:
1825
| [[info:libc:Initial Signal Actions]] |
1826
| [[info:libc:Basic Signal Handling]] |
1827
*/
1828
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1829
if(ret == -1){
1830
perror_plus("sigaction");
1831
return EX_OSERR;
1832
}
1833
if(old_sigterm_action.sa_handler != SIG_IGN){
1834
ret = sigaction(SIGINT, &sigterm_action, NULL);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
exitcode = EX_OSERR;
1838
goto end;
1839
}
1840
}
1841
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1842
if(ret == -1){
1843
perror_plus("sigaction");
1844
return EX_OSERR;
1845
}
1846
if(old_sigterm_action.sa_handler != SIG_IGN){
1847
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
exitcode = EX_OSERR;
1851
goto end;
1852
}
1853
}
1854
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1855
if(ret == -1){
1856
perror_plus("sigaction");
1857
return EX_OSERR;
1858
}
1859
if(old_sigterm_action.sa_handler != SIG_IGN){
1860
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
exitcode = EX_OSERR;
1864
goto end;
1865
}
1866
}
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1867
1059
1868
1060
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1061
if(interface[0] != '\0'){
1889
1062
#ifdef __linux__
1890
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1892
1065
ret = klogctl(8, NULL, 5);
1893
1066
bool restore_loglevel = true;
1894
1067
if(ret == -1){
1895
1068
restore_loglevel = false;
1896
perror_plus("klogctl");
1069
perror("klogctl");
1897
1070
}
1898
1071
#endif /* __linux__ */
1899
1072
1900
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
1074
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1904
1077
#ifdef __linux__
1905
1078
if(restore_loglevel){
1906
1079
ret = klogctl(7, NULL, 0);
1907
1080
if(ret == -1){
1908
perror_plus("klogctl");
1081
perror("klogctl");
1909
1082
}
1910
1083
}
1911
1084
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1918
1085
goto end;
1919
1086
}
1920
1087
strcpy(network.ifr_name, interface);
1921
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
1089
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1090
perror("ioctl SIOCGIFFLAGS");
1924
1091
#ifdef __linux__
1925
1092
if(restore_loglevel){
1926
1093
ret = klogctl(7, NULL, 0);
1927
1094
if(ret == -1){
1928
perror_plus("klogctl");
1095
perror("klogctl");
1929
1096
}
1930
1097
}
1931
1098
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1099
exitcode = EXIT_FAILURE;
1939
1100
goto end;
1940
1101
}
1941
1102
if((network.ifr_flags & IFF_UP) == 0){
1942
1103
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
1105
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1949
1108
#ifdef __linux__
1950
1109
if(restore_loglevel){
1951
1110
ret = klogctl(7, NULL, 0);
1952
1111
if(ret == -1){
1953
perror_plus("klogctl");
1112
perror("klogctl");
1954
1113
}
1955
1114
}
1956
1115
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1963
1116
goto end;
1964
1117
}
1965
1118
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1968
1120
for(int i=0; i < delay * 4; i++){
1969
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
1122
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1972
1124
} else if(network.ifr_flags & IFF_RUNNING){
1973
1125
break;
1974
1126
}
1975
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
1128
ret = nanosleep(&sleeptime, NULL);
1977
1129
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1130
perror("nanosleep");
1979
1131
}
1980
1132
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1987
1136
}
1988
1137
#ifdef __linux__
1989
1138
if(restore_loglevel){
1990
1139
/* Restores kernel loglevel to default */
1991
1140
ret = klogctl(7, NULL, 0);
1992
1141
if(ret == -1){
1993
perror_plus("klogctl");
1142
perror("klogctl");
1994
1143
}
1995
1144
}
1996
1145
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2012
}
2013
2014
if(quit_now){
2015
goto end;
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
2016
1160
}
2017
1161
2018
1162
ret = init_gnutls_global(pubkey, seckey);
2019
1163
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2022
exitcode = EX_UNAVAILABLE;
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2023
1166
goto end;
2024
1167
} else {
2025
1168
gnutls_initialized = true;
2026
1169
}
2027
1170
2028
if(quit_now){
2029
goto end;
2030
}
2031
2032
1171
if(mkdtemp(tempdir) == NULL){
2033
perror_plus("mkdtemp");
1172
perror("mkdtemp");
2034
1173
goto end;
2035
1174
}
2036
1175
tempdir_created = true;
2037
1176
2038
if(quit_now){
2039
goto end;
2040
}
2041
2042
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2045
exitcode = EX_UNAVAILABLE;
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2046
1180
goto end;
2047
1181
} else {
2048
1182
gpgme_initialized = true;
2049
1183
}
2050
1184
2051
if(quit_now){
2052
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2053
1192
}
2054
1193
2055
1194
if(connect_to != NULL){
2057
1196
/* (Mainly meant for debugging) */
2058
1197
char *address = strrchr(connect_to, ':');
2059
1198
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2062
exitcode = EX_USAGE;
2063
goto end;
2064
}
2065
2066
if(quit_now){
2067
goto end;
2068
}
2069
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
2070
1203
uint16_t port;
2071
1204
errno = 0;
2072
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2073
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
1207
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2077
exitcode = EX_USAGE;
2078
goto end;
2079
}
2080
2081
if(quit_now){
2082
goto end;
2083
}
2084
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
2085
1212
port = (uint16_t)tmpmax;
2086
1213
*address = '\0';
1214
address = connect_to;
2087
1215
/* Colon in address indicates IPv6 */
2088
1216
int af;
2089
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2090
1218
af = AF_INET6;
2091
/* Accept [] around IPv6 address - see RFC 5952 */
2092
if(connect_to[0] == '[' and address[-1] == ']')
2093
{
2094
connect_to++;
2095
address[-1] = '\0';
2096
}
2097
1219
} else {
2098
1220
af = AF_INET;
2099
1221
}
2100
address = connect_to;
2101
2102
if(quit_now){
2103
goto end;
2104
}
2105
2106
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2108
if(quit_now or ret == 0){
2109
break;
2110
}
2111
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2114
}
2115
sleep((int)retry_interval);
2116
}
2117
2118
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2119
1226
exitcode = EXIT_SUCCESS;
2120
1227
}
1228
goto end;
1229
}
2121
1230
2122
goto end;
2123
}
2124
2125
if(quit_now){
2126
goto end;
2127
}
2128
2129
1231
{
2130
1232
AvahiServerConfig config;
2131
1233
/* Do not publish any local Zeroconf records */
2146
1248
2147
1249
/* Check if creating the Avahi server object succeeded */
2148
1250
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
2151
1252
avahi_strerror(error));
2152
exitcode = EX_UNAVAILABLE;
2153
goto end;
2154
}
2155
2156
if(quit_now){
1253
exitcode = EXIT_FAILURE;
2157
1254
goto end;
2158
1255
}
2159
1256
2162
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
1260
NULL, 0, browse_callback, NULL);
2164
1261
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
1262
fprintf(stderr, "Failed to create service browser: %s\n",
2167
1263
avahi_strerror(avahi_server_errno(mc.server)));
2168
exitcode = EX_UNAVAILABLE;
2169
goto end;
2170
}
2171
2172
if(quit_now){
1264
exitcode = EXIT_FAILURE;
2173
1265
goto end;
2174
1266
}
2175
1267
2176
1268
/* Run the main loop */
2177
1269
2178
1270
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2181
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2185
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2190
1275
2191
1276
end:
2192
1277
2193
1278
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2196
1280
}
2197
1281
2198
1282
/* Cleanup things */
2214
1298
if(gpgme_initialized){
2215
1299
gpgme_release(mc.ctx);
2216
1300
}
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2260
}
2261
}
2262
2263
/* Removes the GPGME temp directory and all files inside */
1301
1302
/* Removes the temp directory used by GPGME */
2264
1303
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2272
1324
char *fullname = NULL;
2273
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
1326
direntry->d_name);
2275
1327
if(ret < 0){
2276
perror_plus("asprintf");
1328
perror("asprintf");
2277
1329
continue;
2278
1330
}
2279
1331
ret = remove(fullname);
2280
1332
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2283
1335
}
2284
1336
free(fullname);
2285
1337
}
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
1338
closedir(d);
2292
1339
}
2293
1340
ret = rmdir(tempdir);
2294
1341
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2296
}
2297
}
2298
2299
if(quit_now){
2300
sigemptyset(&old_sigterm_action.sa_mask);
2301
old_sigterm_action.sa_handler = SIG_DFL;
2302
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2303
&old_sigterm_action,
2304
NULL));
2305
if(ret == -1){
2306
perror_plus("sigaction");
2307
}
2308
do {
2309
ret = raise(signal_received);
2310
} while(ret != 0 and errno == EINTR);
2311
if(ret != 0){
2312
perror_plus("raise");
2313
abort();
2314
}
2315
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2316
1344
}
2317
1345
2318
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0