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» Revision
24.1.135
(compared to revision 237.2.13)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- files added:
- debian/watch
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
36
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
37
38
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror() */
39
stdout, ferror(), sscanf(),
40
remove() */
40
41
#include <stdint.h> /* uint16_t, uint32_t */
41
42
#include <stddef.h> /* NULL, size_t, ssize_t */
42
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
44
srand() */
44
#include <stdbool.h> /* bool, true */
45
#include <stdbool.h> /* bool, false, true */
45
46
#include <string.h> /* memset(), strcmp(), strlen(),
46
47
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
48
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
50
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
52
53
#include <sys/stat.h> /* open() */
53
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
55
connect() */
55
inet_pton(), connect() */
56
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
59
60
#include <assert.h> /* assert() */
60
61
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
62
#include <time.h> /* nanosleep(), time() */
62
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
63
64
SIOCSIFFLAGS, if_indextoname(),
64
65
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
66
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
70
getuid(), getgid(), setuid(),
68
71
setgid() */
69
72
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
73
#include <iso646.h> /* not, or, and */
71
74
#include <argp.h> /* struct argp_option, error_t, struct
72
75
argp_state, struct argp,
73
76
argp_parse(), ARGP_KEY_ARG,
74
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
79
#ifdef __linux__
80
#include <sys/klog.h> /* klogctl() */
81
#endif
75
82
76
83
/* Avahi */
77
84
/* All Avahi types, constants and functions
90
97
gnutls_*
91
98
init_gnutls_session(),
92
99
GNUTLS_* */
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
100
#include <gnutls/openpgp.h>
101
/* gnutls_certificate_set_openpgp_key_file(),
94
102
GNUTLS_OPENPGP_FMT_BASE64 */
95
103
96
104
/* GPGME */
122
130
gpgme_ctx_t ctx;
123
131
} mandos_context;
124
132
133
/* global context so signal handler can reach it*/
134
mandos_context mc = { .simple_poll = NULL, .server = NULL,
135
.dh_bits = 1024, .priority = "SECURE256"
136
":!CTYPE-X.509:+CTYPE-OPENPGP" };
137
125
138
/*
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
128
* "buffer_length" is how much is already used.
139
* Make additional room in "buffer" for at least BUFFER_SIZE
140
* additional bytes. "buffer_capacity" is how much is currently
141
* allocated, "buffer_length" is how much is already used.
129
142
*/
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
143
size_t incbuffer(char **buffer, size_t buffer_length,
131
144
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
145
if(buffer_length + BUFFER_SIZE > buffer_capacity){
133
146
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
134
if (buffer == NULL){
147
if(buffer == NULL){
135
148
return 0;
136
149
}
137
150
buffer_capacity += BUFFER_SIZE;
142
155
/*
143
156
* Initialize GPGME.
144
157
*/
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
158
static bool init_gpgme(const char *seckey,
146
159
const char *pubkey, const char *tempdir){
147
160
int ret;
148
161
gpgme_error_t rc;
150
163
151
164
152
165
/*
153
* Helper function to insert pub and seckey to the enigne keyring.
166
* Helper function to insert pub and seckey to the engine keyring.
154
167
*/
155
168
bool import_key(const char *filename){
156
169
int fd;
157
170
gpgme_data_t pgp_data;
158
171
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
172
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
160
173
if(fd == -1){
161
174
perror("open");
162
175
return false;
163
176
}
164
177
165
178
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
179
if(rc != GPG_ERR_NO_ERROR){
167
180
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
181
gpgme_strsource(rc), gpgme_strerror(rc));
169
182
return false;
170
183
}
171
184
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
185
rc = gpgme_op_import(mc.ctx, pgp_data);
186
if(rc != GPG_ERR_NO_ERROR){
174
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
188
gpgme_strsource(rc), gpgme_strerror(rc));
176
189
return false;
177
190
}
178
191
179
ret = TEMP_FAILURE_RETRY(close(fd));
192
ret = (int)TEMP_FAILURE_RETRY(close(fd));
180
193
if(ret == -1){
181
194
perror("close");
182
195
}
184
197
return true;
185
198
}
186
199
187
if (debug){
200
if(debug){
188
201
fprintf(stderr, "Initialize gpgme\n");
189
202
}
190
203
191
204
/* Init GPGME */
192
205
gpgme_check_version(NULL);
193
206
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
194
if (rc != GPG_ERR_NO_ERROR){
207
if(rc != GPG_ERR_NO_ERROR){
195
208
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
209
gpgme_strsource(rc), gpgme_strerror(rc));
197
210
return false;
198
211
}
199
212
200
213
/* Set GPGME home directory for the OpenPGP engine only */
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
214
rc = gpgme_get_engine_info(&engine_info);
215
if(rc != GPG_ERR_NO_ERROR){
203
216
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
217
gpgme_strsource(rc), gpgme_strerror(rc));
205
218
return false;
218
231
}
219
232
220
233
/* Create new GPGME "context" */
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
234
rc = gpgme_new(&(mc.ctx));
235
if(rc != GPG_ERR_NO_ERROR){
223
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
237
gpgme_strsource(rc), gpgme_strerror(rc));
225
238
return false;
226
239
}
227
240
228
if (not import_key(pubkey) or not import_key(seckey)){
241
if(not import_key(pubkey) or not import_key(seckey)){
229
242
return false;
230
243
}
231
244
236
249
* Decrypt OpenPGP data.
237
250
* Returns -1 on error
238
251
*/
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
252
static ssize_t pgp_packet_decrypt(const char *cryptotext,
253
size_t crypto_size,
254
char **plaintext){
243
255
gpgme_data_t dh_crypto, dh_plain;
244
256
gpgme_error_t rc;
245
257
ssize_t ret;
246
258
size_t plaintext_capacity = 0;
247
259
ssize_t plaintext_length = 0;
248
260
249
if (debug){
261
if(debug){
250
262
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
251
263
}
252
264
253
265
/* Create new GPGME data buffer from memory cryptotext */
254
266
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
255
267
0);
256
if (rc != GPG_ERR_NO_ERROR){
268
if(rc != GPG_ERR_NO_ERROR){
257
269
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
258
270
gpgme_strsource(rc), gpgme_strerror(rc));
259
271
return -1;
261
273
262
274
/* Create new empty GPGME data buffer for the plaintext */
263
275
rc = gpgme_data_new(&dh_plain);
264
if (rc != GPG_ERR_NO_ERROR){
276
if(rc != GPG_ERR_NO_ERROR){
265
277
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
266
278
gpgme_strsource(rc), gpgme_strerror(rc));
267
279
gpgme_data_release(dh_crypto);
270
282
271
283
/* Decrypt data from the cryptotext data buffer to the plaintext
272
284
data buffer */
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
285
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
286
if(rc != GPG_ERR_NO_ERROR){
275
287
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
288
gpgme_strsource(rc), gpgme_strerror(rc));
277
289
plaintext_length = -1;
278
if (debug){
290
if(debug){
279
291
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
292
result = gpgme_op_decrypt_result(mc.ctx);
293
if(result == NULL){
282
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
283
295
} else {
284
296
fprintf(stderr, "Unsupported algorithm: %s\n",
311
323
}
312
324
313
325
/* Seek back to the beginning of the GPGME plaintext data buffer */
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
326
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
315
327
perror("gpgme_data_seek");
316
328
plaintext_length = -1;
317
329
goto decrypt_end;
319
331
320
332
*plaintext = NULL;
321
333
while(true){
322
plaintext_capacity = adjustbuffer(plaintext,
334
plaintext_capacity = incbuffer(plaintext,
323
335
(size_t)plaintext_length,
324
336
plaintext_capacity);
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
337
if(plaintext_capacity == 0){
338
perror("incbuffer");
327
339
plaintext_length = -1;
328
340
goto decrypt_end;
329
341
}
331
343
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
332
344
BUFFER_SIZE);
333
345
/* Print the data, if any */
334
if (ret == 0){
346
if(ret == 0){
335
347
/* EOF */
336
348
break;
337
349
}
361
373
return plaintext_length;
362
374
}
363
375
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
376
static const char * safer_gnutls_strerror(int value){
377
const char *ret = gnutls_strerror(value); /* Spurious warning from
378
-Wunreachable-code */
379
if(ret == NULL)
367
380
ret = "(unknown)";
368
381
return ret;
369
382
}
374
387
fprintf(stderr, "GnuTLS: %s", string);
375
388
}
376
389
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
390
static int init_gnutls_global(const char *pubkeyfilename,
379
391
const char *seckeyfilename){
380
392
int ret;
381
393
384
396
}
385
397
386
398
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
399
if(ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "GnuTLS global_init: %s\n",
401
safer_gnutls_strerror(ret));
390
402
return -1;
391
403
}
392
404
393
if (debug){
405
if(debug){
394
406
/* "Use a log level over 10 to enable all debugging options."
395
407
* - GnuTLS manual
396
408
*/
399
411
}
400
412
401
413
/* OpenPGP credentials */
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
414
gnutls_certificate_allocate_credentials(&mc.cred);
415
if(ret != GNUTLS_E_SUCCESS){
416
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
417
from
418
-Wunreachable-code
419
*/
420
safer_gnutls_strerror(ret));
421
gnutls_global_deinit();
408
422
return -1;
409
423
}
410
424
415
429
}
416
430
417
431
ret = gnutls_certificate_set_openpgp_key_file
418
(mc->cred, pubkeyfilename, seckeyfilename,
432
(mc.cred, pubkeyfilename, seckeyfilename,
419
433
GNUTLS_OPENPGP_FMT_BASE64);
420
if (ret != GNUTLS_E_SUCCESS) {
434
if(ret != GNUTLS_E_SUCCESS){
421
435
fprintf(stderr,
422
436
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
437
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
441
}
428
442
429
443
/* GnuTLS server initialization */
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
444
ret = gnutls_dh_params_init(&mc.dh_params);
445
if(ret != GNUTLS_E_SUCCESS){
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
434
448
goto globalfail;
435
449
}
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
450
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
451
if(ret != GNUTLS_E_SUCCESS){
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
440
454
goto globalfail;
441
455
}
442
456
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
457
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
444
458
445
459
return 0;
446
460
447
461
globalfail:
448
462
449
gnutls_certificate_free_credentials(mc->cred);
463
gnutls_certificate_free_credentials(mc.cred);
450
464
gnutls_global_deinit();
451
gnutls_dh_params_deinit(mc->dh_params);
465
gnutls_dh_params_deinit(mc.dh_params);
452
466
return -1;
453
467
}
454
468
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
469
static int init_gnutls_session(gnutls_session_t *session){
457
470
int ret;
458
471
/* GnuTLS session creation */
459
472
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
473
if(ret != GNUTLS_E_SUCCESS){
461
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
462
475
safer_gnutls_strerror(ret));
463
476
}
464
477
465
478
{
466
479
const char *err;
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
481
if(ret != GNUTLS_E_SUCCESS){
469
482
fprintf(stderr, "Syntax error at: %s\n", err);
470
483
fprintf(stderr, "GnuTLS error: %s\n",
471
484
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
485
gnutls_deinit(*session);
473
486
return -1;
474
487
}
475
488
}
476
489
477
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
491
mc.cred);
492
if(ret != GNUTLS_E_SUCCESS){
480
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
494
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
495
gnutls_deinit(*session);
483
496
return -1;
484
497
}
485
498
486
499
/* ignore client certificate if any. */
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
489
502
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
491
504
492
505
return 0;
493
506
}
499
512
/* Called when a Mandos server is found */
500
513
static int start_mandos_communication(const char *ip, uint16_t port,
501
514
AvahiIfIndex if_index,
502
mandos_context *mc){
515
int af){
503
516
int ret, tcp_sd;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
517
ssize_t sret;
518
union {
519
struct sockaddr_in in;
520
struct sockaddr_in6 in6;
521
} to;
505
522
char *buffer = NULL;
506
523
char *decrypted_buffer;
507
524
size_t buffer_length = 0;
509
526
ssize_t decrypted_buffer_size;
510
527
size_t written;
511
528
int retval = 0;
512
char interface[IF_NAMESIZE];
513
529
gnutls_session_t session;
514
515
ret = init_gnutls_session (mc, &session);
516
if (ret != 0){
530
int pf; /* Protocol family */
531
532
switch(af){
533
case AF_INET6:
534
pf = PF_INET6;
535
break;
536
case AF_INET:
537
pf = PF_INET;
538
break;
539
default:
540
fprintf(stderr, "Bad address family: %d\n", af);
541
return -1;
542
}
543
544
ret = init_gnutls_session(&session);
545
if(ret != 0){
517
546
return -1;
518
547
}
519
548
520
549
if(debug){
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
550
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
522
551
"\n", ip, port);
523
552
}
524
553
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
526
if(tcp_sd < 0) {
554
tcp_sd = socket(pf, SOCK_STREAM, 0);
555
if(tcp_sd < 0){
527
556
perror("socket");
528
557
return -1;
529
558
}
530
559
531
if(debug){
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
533
perror("if_indextoname");
534
return -1;
535
}
536
fprintf(stderr, "Binding to interface %s\n", interface);
537
}
538
539
560
memset(&to, 0, sizeof(to));
540
to.in6.sin6_family = AF_INET6;
541
/* It would be nice to have a way to detect if we were passed an
542
IPv4 address here. Now we assume an IPv6 address. */
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
544
if (ret < 0 ){
561
if(af == AF_INET6){
562
to.in6.sin6_family = (uint16_t)af;
563
ret = inet_pton(af, ip, &to.in6.sin6_addr);
564
} else { /* IPv4 */
565
to.in.sin_family = (sa_family_t)af;
566
ret = inet_pton(af, ip, &to.in.sin_addr);
567
}
568
if(ret < 0 ){
545
569
perror("inet_pton");
546
570
return -1;
547
571
}
549
573
fprintf(stderr, "Bad address: %s\n", ip);
550
574
return -1;
551
575
}
552
to.in6.sin6_port = htons(port); /* Spurious warning */
553
554
to.in6.sin6_scope_id = (uint32_t)if_index;
576
if(af == AF_INET6){
577
to.in6.sin6_port = htons(port); /* Spurious warnings from
578
-Wconversion and
579
-Wunreachable-code */
580
581
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
582
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
583
-Wunreachable-code*/
584
if(if_index == AVAHI_IF_UNSPEC){
585
fprintf(stderr, "An IPv6 link-local address is incomplete"
586
" without a network interface\n");
587
return -1;
588
}
589
/* Set the network interface number as scope */
590
to.in6.sin6_scope_id = (uint32_t)if_index;
591
}
592
} else {
593
to.in.sin_port = htons(port); /* Spurious warnings from
594
-Wconversion and
595
-Wunreachable-code */
596
}
555
597
556
598
if(debug){
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
558
port);
559
char addrstr[INET6_ADDRSTRLEN] = "";
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
561
sizeof(addrstr)) == NULL){
599
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
600
char interface[IF_NAMESIZE];
601
if(if_indextoname((unsigned int)if_index, interface) == NULL){
602
perror("if_indextoname");
603
} else {
604
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
605
ip, interface, port);
606
}
607
} else {
608
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
609
port);
610
}
611
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
612
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
613
const char *pcret;
614
if(af == AF_INET6){
615
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
616
sizeof(addrstr));
617
} else {
618
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
619
sizeof(addrstr));
620
}
621
if(pcret == NULL){
562
622
perror("inet_ntop");
563
623
} else {
564
624
if(strcmp(addrstr, ip) != 0){
567
627
}
568
628
}
569
629
570
ret = connect(tcp_sd, &to.in, sizeof(to));
571
if (ret < 0){
630
if(af == AF_INET6){
631
ret = connect(tcp_sd, &to.in6, sizeof(to));
632
} else {
633
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
634
}
635
if(ret < 0){
572
636
perror("connect");
573
637
return -1;
574
638
}
575
639
576
640
const char *out = mandos_protocol_version;
577
641
written = 0;
578
while (true){
642
while(true){
579
643
size_t out_size = strlen(out);
580
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
644
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
581
645
out_size - written));
582
if (ret == -1){
646
if(ret == -1){
583
647
perror("write");
584
648
retval = -1;
585
649
goto mandos_end;
588
652
if(written < out_size){
589
653
continue;
590
654
} else {
591
if (out == mandos_protocol_version){
655
if(out == mandos_protocol_version){
592
656
written = 0;
593
657
out = "\r\n";
594
658
} else {
601
665
fprintf(stderr, "Establishing TLS session with %s\n", ip);
602
666
}
603
667
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
668
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
605
669
606
670
do{
607
ret = gnutls_handshake (session);
671
ret = gnutls_handshake(session);
608
672
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
609
673
610
if (ret != GNUTLS_E_SUCCESS){
674
if(ret != GNUTLS_E_SUCCESS){
611
675
if(debug){
612
676
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
613
gnutls_perror (ret);
677
gnutls_perror(ret);
614
678
}
615
679
retval = -1;
616
680
goto mandos_end;
619
683
/* Read OpenPGP packet that contains the wanted password */
620
684
621
685
if(debug){
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
686
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
623
687
ip);
624
688
}
625
689
626
690
while(true){
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
691
buffer_capacity = incbuffer(&buffer, buffer_length,
628
692
buffer_capacity);
629
if (buffer_capacity == 0){
630
perror("adjustbuffer");
693
if(buffer_capacity == 0){
694
perror("incbuffer");
631
695
retval = -1;
632
696
goto mandos_end;
633
697
}
634
698
635
ret = gnutls_record_recv(session, buffer+buffer_length,
636
BUFFER_SIZE);
637
if (ret == 0){
699
sret = gnutls_record_recv(session, buffer+buffer_length,
700
BUFFER_SIZE);
701
if(sret == 0){
638
702
break;
639
703
}
640
if (ret < 0){
641
switch(ret){
704
if(sret < 0){
705
switch(sret){
642
706
case GNUTLS_E_INTERRUPTED:
643
707
case GNUTLS_E_AGAIN:
644
708
break;
645
709
case GNUTLS_E_REHANDSHAKE:
646
710
do{
647
ret = gnutls_handshake (session);
711
ret = gnutls_handshake(session);
648
712
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
649
if (ret < 0){
713
if(ret < 0){
650
714
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
651
gnutls_perror (ret);
715
gnutls_perror(ret);
652
716
retval = -1;
653
717
goto mandos_end;
654
718
}
657
721
fprintf(stderr, "Unknown error while reading data from"
658
722
" encrypted session with Mandos server\n");
659
723
retval = -1;
660
gnutls_bye (session, GNUTLS_SHUT_RDWR);
724
gnutls_bye(session, GNUTLS_SHUT_RDWR);
661
725
goto mandos_end;
662
726
}
663
727
} else {
664
buffer_length += (size_t) ret;
728
buffer_length += (size_t) sret;
665
729
}
666
730
}
667
731
669
733
fprintf(stderr, "Closing TLS session\n");
670
734
}
671
735
672
gnutls_bye (session, GNUTLS_SHUT_RDWR);
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
673
737
674
if (buffer_length > 0){
675
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
738
if(buffer_length > 0){
739
decrypted_buffer_size = pgp_packet_decrypt(buffer,
676
740
buffer_length,
677
741
&decrypted_buffer);
678
if (decrypted_buffer_size >= 0){
742
if(decrypted_buffer_size >= 0){
679
743
written = 0;
680
744
while(written < (size_t) decrypted_buffer_size){
681
ret = (int)fwrite (decrypted_buffer + written, 1,
682
(size_t)decrypted_buffer_size - written,
683
stdout);
745
ret = (int)fwrite(decrypted_buffer + written, 1,
746
(size_t)decrypted_buffer_size - written,
747
stdout);
684
748
if(ret == 0 and ferror(stdout)){
685
749
if(debug){
686
750
fprintf(stderr, "Error writing encrypted data: %s\n",
703
767
704
768
mandos_end:
705
769
free(buffer);
706
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
707
771
if(ret == -1){
708
772
perror("close");
709
773
}
710
gnutls_deinit (session);
774
gnutls_deinit(session);
711
775
return retval;
712
776
}
713
777
714
778
static void resolve_callback(AvahiSServiceResolver *r,
715
779
AvahiIfIndex interface,
716
AVAHI_GCC_UNUSED AvahiProtocol protocol,
780
AvahiProtocol proto,
717
781
AvahiResolverEvent event,
718
782
const char *name,
719
783
const char *type,
724
788
AVAHI_GCC_UNUSED AvahiStringList *txt,
725
789
AVAHI_GCC_UNUSED AvahiLookupResultFlags
726
790
flags,
727
void* userdata) {
728
mandos_context *mc = userdata;
791
__attribute__((unused)) void* userdata){
729
792
assert(r);
730
793
731
794
/* Called whenever a service has been resolved successfully or
732
795
timed out */
733
796
734
switch (event) {
797
switch(event){
735
798
default:
736
799
case AVAHI_RESOLVER_FAILURE:
737
800
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
738
801
" of type '%s' in domain '%s': %s\n", name, type, domain,
739
avahi_strerror(avahi_server_errno(mc->server)));
802
avahi_strerror(avahi_server_errno(mc.server)));
740
803
break;
741
804
742
805
case AVAHI_RESOLVER_FOUND:
745
808
avahi_address_snprint(ip, sizeof(ip), address);
746
809
if(debug){
747
810
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
748
PRIu16 ") on port %d\n", name, host_name, ip,
749
interface, port);
811
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
812
ip, (intmax_t)interface, port);
750
813
}
751
int ret = start_mandos_communication(ip, port, interface, mc);
752
if (ret == 0){
753
avahi_simple_poll_quit(mc->simple_poll);
814
int ret = start_mandos_communication(ip, port, interface,
815
avahi_proto_to_af(proto));
816
if(ret == 0){
817
avahi_simple_poll_quit(mc.simple_poll);
754
818
}
755
819
}
756
820
}
757
821
avahi_s_service_resolver_free(r);
758
822
}
759
823
760
static void browse_callback( AvahiSServiceBrowser *b,
761
AvahiIfIndex interface,
762
AvahiProtocol protocol,
763
AvahiBrowserEvent event,
764
const char *name,
765
const char *type,
766
const char *domain,
767
AVAHI_GCC_UNUSED AvahiLookupResultFlags
768
flags,
769
void* userdata) {
770
mandos_context *mc = userdata;
824
static void browse_callback(AvahiSServiceBrowser *b,
825
AvahiIfIndex interface,
826
AvahiProtocol protocol,
827
AvahiBrowserEvent event,
828
const char *name,
829
const char *type,
830
const char *domain,
831
AVAHI_GCC_UNUSED AvahiLookupResultFlags
832
flags,
833
__attribute__((unused)) void* userdata){
771
834
assert(b);
772
835
773
836
/* Called whenever a new services becomes available on the LAN or
774
837
is removed from the LAN */
775
838
776
switch (event) {
839
switch(event){
777
840
default:
778
841
case AVAHI_BROWSER_FAILURE:
779
842
780
843
fprintf(stderr, "(Avahi browser) %s\n",
781
avahi_strerror(avahi_server_errno(mc->server)));
782
avahi_simple_poll_quit(mc->simple_poll);
844
avahi_strerror(avahi_server_errno(mc.server)));
845
avahi_simple_poll_quit(mc.simple_poll);
783
846
return;
784
847
785
848
case AVAHI_BROWSER_NEW:
788
851
the callback function is called the Avahi server will free the
789
852
resolver for us. */
790
853
791
if (!(avahi_s_service_resolver_new(mc->server, interface,
854
if(!(avahi_s_service_resolver_new(mc.server, interface,
792
855
protocol, name, type, domain,
793
856
AVAHI_PROTO_INET6, 0,
794
resolve_callback, mc)))
857
resolve_callback, NULL)))
795
858
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
796
name, avahi_strerror(avahi_server_errno(mc->server)));
859
name, avahi_strerror(avahi_server_errno(mc.server)));
797
860
break;
798
861
799
862
case AVAHI_BROWSER_REMOVE:
808
871
}
809
872
}
810
873
874
/* stop main loop after sigterm has been called */
875
static void handle_sigterm(__attribute__((unused)) int sig){
876
int old_errno = errno;
877
avahi_simple_poll_quit(mc.simple_poll);
878
errno = old_errno;
879
}
880
811
881
int main(int argc, char *argv[]){
812
AvahiSServiceBrowser *sb = NULL;
813
int error;
814
int ret;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
818
int sd;
819
uid_t uid;
820
gid_t gid;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
826
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
832
833
{
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
840
.group = 1 },
841
{ .name = "interface", .key = 'i',
842
.arg = "NAME",
843
.doc = "Interface that will be used to search for Mandos"
844
" servers",
845
.group = 1 },
846
{ .name = "seckey", .key = 's',
847
.arg = "FILE",
848
.doc = "OpenPGP secret key file base name",
849
.group = 1 },
850
{ .name = "pubkey", .key = 'p',
851
.arg = "FILE",
852
.doc = "OpenPGP public key file base name",
853
.group = 2 },
854
{ .name = "dh-bits", .key = 129,
855
.arg = "BITS",
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
858
.group = 2 },
859
{ .name = "priority", .key = 130,
860
.arg = "STRING",
861
.doc = "GnuTLS priority string for the TLS handshake",
862
.group = 1 },
863
{ .name = NULL }
864
};
865
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
870
switch (key) {
871
case 128: /* --debug */
872
debug = true;
873
break;
874
case 'c': /* --connect */
875
connect_to = arg;
876
break;
877
case 'i': /* --interface */
878
interface = arg;
879
break;
880
case 's': /* --seckey */
881
seckey = arg;
882
break;
883
case 'p': /* --pubkey */
884
pubkey = arg;
885
break;
886
case 129: /* --dh-bits */
887
errno = 0;
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
889
if (errno){
890
perror("strtol");
891
exit(EXIT_FAILURE);
882
AvahiSServiceBrowser *sb = NULL;
883
int error;
884
int ret;
885
intmax_t tmpmax;
886
int numchars;
887
int exitcode = EXIT_SUCCESS;
888
const char *interface = "eth0";
889
struct ifreq network;
890
int sd;
891
uid_t uid;
892
gid_t gid;
893
char *connect_to = NULL;
894
char tempdir[] = "/tmp/mandosXXXXXX";
895
bool tempdir_created = false;
896
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
897
const char *seckey = PATHDIR "/" SECKEY;
898
const char *pubkey = PATHDIR "/" PUBKEY;
899
900
bool gnutls_initialized = false;
901
bool gpgme_initialized = false;
902
double delay = 2.5;
903
904
struct sigaction old_sigterm_action;
905
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
906
907
{
908
struct argp_option options[] = {
909
{ .name = "debug", .key = 128,
910
.doc = "Debug mode", .group = 3 },
911
{ .name = "connect", .key = 'c',
912
.arg = "ADDRESS:PORT",
913
.doc = "Connect directly to a specific Mandos server",
914
.group = 1 },
915
{ .name = "interface", .key = 'i',
916
.arg = "NAME",
917
.doc = "Network interface that will be used to search for"
918
" Mandos servers",
919
.group = 1 },
920
{ .name = "seckey", .key = 's',
921
.arg = "FILE",
922
.doc = "OpenPGP secret key file base name",
923
.group = 1 },
924
{ .name = "pubkey", .key = 'p',
925
.arg = "FILE",
926
.doc = "OpenPGP public key file base name",
927
.group = 2 },
928
{ .name = "dh-bits", .key = 129,
929
.arg = "BITS",
930
.doc = "Bit length of the prime number used in the"
931
" Diffie-Hellman key exchange",
932
.group = 2 },
933
{ .name = "priority", .key = 130,
934
.arg = "STRING",
935
.doc = "GnuTLS priority string for the TLS handshake",
936
.group = 1 },
937
{ .name = "delay", .key = 131,
938
.arg = "SECONDS",
939
.doc = "Maximum delay to wait for interface startup",
940
.group = 2 },
941
{ .name = NULL }
942
};
943
944
error_t parse_opt(int key, char *arg,
945
struct argp_state *state){
946
switch(key){
947
case 128: /* --debug */
948
debug = true;
949
break;
950
case 'c': /* --connect */
951
connect_to = arg;
952
break;
953
case 'i': /* --interface */
954
interface = arg;
955
break;
956
case 's': /* --seckey */
957
seckey = arg;
958
break;
959
case 'p': /* --pubkey */
960
pubkey = arg;
961
break;
962
case 129: /* --dh-bits */
963
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
964
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
965
or arg[numchars] != '\0'){
966
fprintf(stderr, "Bad number of DH bits\n");
967
exit(EXIT_FAILURE);
968
}
969
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
970
break;
971
case 130: /* --priority */
972
mc.priority = arg;
973
break;
974
case 131: /* --delay */
975
ret = sscanf(arg, "%lf%n", &delay, &numchars);
976
if(ret < 1 or arg[numchars] != '\0'){
977
fprintf(stderr, "Bad delay\n");
978
exit(EXIT_FAILURE);
979
}
980
break;
981
case ARGP_KEY_ARG:
982
argp_usage(state);
983
case ARGP_KEY_END:
984
break;
985
default:
986
return ARGP_ERR_UNKNOWN;
987
}
988
return 0;
989
}
990
991
struct argp argp = { .options = options, .parser = parse_opt,
992
.args_doc = "",
993
.doc = "Mandos client -- Get and decrypt"
994
" passwords from a Mandos server" };
995
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
996
if(ret == ARGP_ERR_UNKNOWN){
997
fprintf(stderr, "Unknown error while parsing arguments\n");
998
exitcode = EXIT_FAILURE;
999
goto end;
1000
}
1001
}
1002
1003
if(not debug){
1004
avahi_set_log_function(empty_log);
1005
}
1006
1007
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1008
from the signal handler */
1009
/* Initialize the pseudo-RNG for Avahi */
1010
srand((unsigned int) time(NULL));
1011
mc.simple_poll = avahi_simple_poll_new();
1012
if(mc.simple_poll == NULL){
1013
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1017
1018
sigemptyset(&sigterm_action.sa_mask);
1019
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1020
if(ret == -1){
1021
perror("sigaddset");
1022
exitcode = EXIT_FAILURE;
1023
goto end;
1024
}
1025
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1026
if(ret == -1){
1027
perror("sigaction");
1028
exitcode = EXIT_FAILURE;
1029
goto end;
1030
}
1031
1032
1033
/* If the interface is down, bring it up */
1034
if(interface[0] != '\0'){
1035
#ifdef __linux__
1036
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1037
messages to mess up the prompt */
1038
ret = klogctl(8, NULL, 5);
1039
bool restore_loglevel = true;
1040
if(ret == -1){
1041
restore_loglevel = false;
1042
perror("klogctl");
1043
}
1044
#endif
1045
1046
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1047
if(sd < 0){
1048
perror("socket");
1049
exitcode = EXIT_FAILURE;
1050
#ifdef __linux__
1051
if(restore_loglevel){
1052
ret = klogctl(7, NULL, 0);
1053
if(ret == -1){
1054
perror("klogctl");
1055
}
1056
}
1057
#endif
1058
goto end;
1059
}
1060
strcpy(network.ifr_name, interface);
1061
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1062
if(ret == -1){
1063
perror("ioctl SIOCGIFFLAGS");
1064
#ifdef __linux__
1065
if(restore_loglevel){
1066
ret = klogctl(7, NULL, 0);
1067
if(ret == -1){
1068
perror("klogctl");
1069
}
1070
}
1071
#endif
1072
exitcode = EXIT_FAILURE;
1073
goto end;
1074
}
1075
if((network.ifr_flags & IFF_UP) == 0){
1076
network.ifr_flags |= IFF_UP;
1077
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1078
if(ret == -1){
1079
perror("ioctl SIOCSIFFLAGS");
1080
exitcode = EXIT_FAILURE;
1081
#ifdef __linux__
1082
if(restore_loglevel){
1083
ret = klogctl(7, NULL, 0);
1084
if(ret == -1){
1085
perror("klogctl");
892
1086
}
893
break;
894
case 130: /* --priority */
895
mc.priority = arg;
896
break;
897
case ARGP_KEY_ARG:
898
argp_usage (state);
899
case ARGP_KEY_END:
900
break;
901
default:
902
return ARGP_ERR_UNKNOWN;
903
1087
}
904
return 0;
905
}
906
907
struct argp argp = { .options = options, .parser = parse_opt,
908
.args_doc = "",
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
1088
#endif
915
1089
goto end;
916
1090
}
917
1091
}
918
919
/* If the interface is down, bring it up */
920
{
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
if(sd < 0) {
923
perror("socket");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
strcpy(network.ifr_name, interface);
1092
/* sleep checking until interface is running */
1093
for(int i=0; i < delay * 4; i++){
928
1094
ret = ioctl(sd, SIOCGIFFLAGS, &network);
929
1095
if(ret == -1){
930
1096
perror("ioctl SIOCGIFFLAGS");
931
exitcode = EXIT_FAILURE;
932
goto end;
933
}
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
if(ret == -1){
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
ret = TEMP_FAILURE_RETRY(close(sd));
1097
} else if(network.ifr_flags & IFF_RUNNING){
1098
break;
1099
}
1100
struct timespec sleeptime = { .tv_nsec = 250000000 };
1101
ret = nanosleep(&sleeptime, NULL);
1102
if(ret == -1 and errno != EINTR){
1103
perror("nanosleep");
1104
}
1105
}
1106
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1107
if(ret == -1){
1108
perror("close");
1109
}
1110
#ifdef __linux__
1111
if(restore_loglevel){
1112
/* Restores kernel loglevel to default */
1113
ret = klogctl(7, NULL, 0);
944
1114
if(ret == -1){
945
perror("close");
1115
perror("klogctl");
946
1116
}
947
1117
}
948
949
uid = getuid();
950
gid = getgid();
951
952
ret = setuid(uid);
953
if (ret == -1){
954
perror("setuid");
955
}
956
957
setgid(gid);
958
if (ret == -1){
959
perror("setgid");
960
}
961
962
ret = init_gnutls_global(&mc, pubkey, seckey);
963
if (ret == -1){
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
966
goto end;
967
} else {
968
gnutls_initalized = true;
969
}
970
971
if(mkdtemp(tempdir) == NULL){
972
perror("mkdtemp");
973
tempdir[0] = '\0';
974
goto end;
975
}
976
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
} else {
982
gpgme_initalized = true;
983
}
984
1118
#endif
1119
}
1120
1121
uid = getuid();
1122
gid = getgid();
1123
1124
errno = 0;
1125
setgid(gid);
1126
if(ret == -1){
1127
perror("setgid");
1128
}
1129
1130
ret = setuid(uid);
1131
if(ret == -1){
1132
perror("setuid");
1133
}
1134
1135
ret = init_gnutls_global(pubkey, seckey);
1136
if(ret == -1){
1137
fprintf(stderr, "init_gnutls_global failed\n");
1138
exitcode = EXIT_FAILURE;
1139
goto end;
1140
} else {
1141
gnutls_initialized = true;
1142
}
1143
1144
if(mkdtemp(tempdir) == NULL){
1145
perror("mkdtemp");
1146
goto end;
1147
}
1148
tempdir_created = true;
1149
1150
if(not init_gpgme(pubkey, seckey, tempdir)){
1151
fprintf(stderr, "init_gpgme failed\n");
1152
exitcode = EXIT_FAILURE;
1153
goto end;
1154
} else {
1155
gpgme_initialized = true;
1156
}
1157
1158
if(interface[0] != '\0'){
985
1159
if_index = (AvahiIfIndex) if_nametoindex(interface);
986
1160
if(if_index == 0){
987
1161
fprintf(stderr, "No such interface: \"%s\"\n", interface);
988
exit(EXIT_FAILURE);
989
}
990
991
if(connect_to != NULL){
992
/* Connect directly, do not use Zeroconf */
993
/* (Mainly meant for debugging) */
994
char *address = strrchr(connect_to, ':');
995
if(address == NULL){
996
fprintf(stderr, "No colon in address\n");
997
exitcode = EXIT_FAILURE;
998
goto end;
999
}
1000
errno = 0;
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1002
if(errno){
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
*address = '\0';
1008
address = connect_to;
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1010
if(ret < 0){
1011
exitcode = EXIT_FAILURE;
1012
} else {
1013
exitcode = EXIT_SUCCESS;
1014
}
1015
goto end;
1016
}
1017
1018
if (not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize the pseudo-RNG for Avahi */
1023
srand((unsigned int) time(NULL));
1024
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1029
" object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
{
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1042
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1046
NULL, &error);
1047
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1050
}
1051
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
1055
avahi_strerror(error));
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
1062
AVAHI_PROTO_INET6,
1063
"_mandos._tcp", NULL, 0,
1064
browse_callback, &mc);
1065
if (sb == NULL) {
1066
fprintf(stderr, "Failed to create service browser: %s\n",
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Run the main loop */
1073
1074
if (debug){
1075
fprintf(stderr, "Starting Avahi loop search\n");
1076
}
1077
1078
avahi_simple_poll_loop(mc.simple_poll);
1079
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1165
}
1166
1167
if(connect_to != NULL){
1168
/* Connect directly, do not use Zeroconf */
1169
/* (Mainly meant for debugging) */
1170
char *address = strrchr(connect_to, ':');
1171
if(address == NULL){
1172
fprintf(stderr, "No colon in address\n");
1173
exitcode = EXIT_FAILURE;
1174
goto end;
1175
}
1176
uint16_t port;
1177
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1178
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1179
or address[numchars+1] != '\0'){
1180
fprintf(stderr, "Bad port number\n");
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
}
1184
port = (uint16_t)tmpmax;
1185
*address = '\0';
1186
address = connect_to;
1187
/* Colon in address indicates IPv6 */
1188
int af;
1189
if(strchr(address, ':') != NULL){
1190
af = AF_INET6;
1191
} else {
1192
af = AF_INET;
1193
}
1194
ret = start_mandos_communication(address, port, if_index,
1195
af);
1196
if(ret < 0){
1197
exitcode = EXIT_FAILURE;
1198
} else {
1199
exitcode = EXIT_SUCCESS;
1200
}
1201
goto end;
1202
}
1203
1204
{
1205
AvahiServerConfig config;
1206
/* Do not publish any local Zeroconf records */
1207
avahi_server_config_init(&config);
1208
config.publish_hinfo = 0;
1209
config.publish_addresses = 0;
1210
config.publish_workstation = 0;
1211
config.publish_domain = 0;
1212
1213
/* Allocate a new server */
1214
mc.server = avahi_server_new(avahi_simple_poll_get
1215
(mc.simple_poll), &config, NULL,
1216
NULL, &error);
1217
1218
/* Free the Avahi configuration data */
1219
avahi_server_config_free(&config);
1220
}
1221
1222
/* Check if creating the Avahi server object succeeded */
1223
if(mc.server == NULL){
1224
fprintf(stderr, "Failed to create Avahi server: %s\n",
1225
avahi_strerror(error));
1226
exitcode = EXIT_FAILURE;
1227
goto end;
1228
}
1229
1230
/* Create the Avahi service browser */
1231
sb = avahi_s_service_browser_new(mc.server, if_index,
1232
AVAHI_PROTO_INET6, "_mandos._tcp",
1233
NULL, 0, browse_callback, NULL);
1234
if(sb == NULL){
1235
fprintf(stderr, "Failed to create service browser: %s\n",
1236
avahi_strerror(avahi_server_errno(mc.server)));
1237
exitcode = EXIT_FAILURE;
1238
goto end;
1239
}
1240
1241
/* Run the main loop */
1242
1243
if(debug){
1244
fprintf(stderr, "Starting Avahi loop search\n");
1245
}
1246
1247
avahi_simple_poll_loop(mc.simple_poll);
1248
1080
1249
end:
1081
1082
if (debug){
1083
fprintf(stderr, "%s exiting\n", argv[0]);
1084
}
1085
1086
/* Cleanup things */
1087
if (sb != NULL)
1088
avahi_s_service_browser_free(sb);
1089
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1092
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1095
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1100
}
1101
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1104
}
1105
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1108
DIR *d;
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1111
if(d == NULL){
1250
1251
if(debug){
1252
fprintf(stderr, "%s exiting\n", argv[0]);
1253
}
1254
1255
/* Cleanup things */
1256
if(sb != NULL)
1257
avahi_s_service_browser_free(sb);
1258
1259
if(mc.server != NULL)
1260
avahi_server_free(mc.server);
1261
1262
if(mc.simple_poll != NULL)
1263
avahi_simple_poll_free(mc.simple_poll);
1264
1265
if(gnutls_initialized){
1266
gnutls_certificate_free_credentials(mc.cred);
1267
gnutls_global_deinit();
1268
gnutls_dh_params_deinit(mc.dh_params);
1269
}
1270
1271
if(gpgme_initialized){
1272
gpgme_release(mc.ctx);
1273
}
1274
1275
/* Removes the temp directory used by GPGME */
1276
if(tempdir_created){
1277
DIR *d;
1278
struct dirent *direntry;
1279
d = opendir(tempdir);
1280
if(d == NULL){
1281
if(errno != ENOENT){
1112
1282
perror("opendir");
1113
} else {
1114
while(true){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1117
break;
1118
}
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1122
direntry->d_name);
1123
if(ret < 0){
1124
perror("asprintf");
1125
continue;
1126
}
1127
ret = unlink(fullname);
1128
if(ret == -1){
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1131
}
1132
free(fullname);
1133
}
1134
}
1135
closedir(d);
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
1283
}
1284
} else {
1285
while(true){
1286
direntry = readdir(d);
1287
if(direntry == NULL){
1288
break;
1289
}
1290
/* Skip "." and ".." */
1291
if(direntry->d_name[0] == '.'
1292
and (direntry->d_name[1] == '\0'
1293
or (direntry->d_name[1] == '.'
1294
and direntry->d_name[2] == '\0'))){
1295
continue;
1296
}
1297
char *fullname = NULL;
1298
ret = asprintf(&fullname, "%s/%s", tempdir,
1299
direntry->d_name);
1300
if(ret < 0){
1301
perror("asprintf");
1302
continue;
1303
}
1304
ret = remove(fullname);
1305
if(ret == -1){
1306
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1307
strerror(errno));
1308
}
1309
free(fullname);
1310
}
1311
closedir(d);
1312
}
1313
ret = rmdir(tempdir);
1314
if(ret == -1 and errno != ENOENT){
1315
perror("rmdir");
1316
}
1317
}
1318
1319
return exitcode;
1144
1320
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0