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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 309.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
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
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
35
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
stdout, ferror(), sscanf(),
40
remove() */
39
41
#include <stdint.h> /* uint16_t, uint32_t */
40
42
#include <stddef.h> /* NULL, size_t, ssize_t */
41
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
44
srand() */
43
#include <stdbool.h> /* bool, true */
45
#include <stdbool.h> /* bool, false, true */
44
46
#include <string.h> /* memset(), strcmp(), strlen(),
45
47
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
47
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
50
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
52
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
55
60
#include <assert.h> /* assert() */
56
61
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
62
#include <time.h> /* nanosleep(), time() */
58
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
64
SIOCSIFFLAGS, if_indextoname(),
60
65
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
61
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
70
getuid(), getgid(), setuid(),
63
71
setgid() */
64
#include <netinet/in.h>
65
72
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
73
#include <iso646.h> /* not, or, and */
67
74
#include <argp.h> /* struct argp_option, error_t, struct
68
75
argp_state, struct argp,
69
76
argp_parse(), ARGP_KEY_ARG,
70
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
71
82
72
83
/* Avahi */
73
84
/* All Avahi types, constants and functions
86
97
gnutls_*
87
98
init_gnutls_session(),
88
99
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
100
#include <gnutls/openpgp.h>
101
/* gnutls_certificate_set_openpgp_key_file(),
90
102
GNUTLS_OPENPGP_FMT_BASE64 */
91
103
92
104
/* GPGME */
98
110
99
111
#define BUFFER_SIZE 256
100
112
113
#define PATHDIR "/conf/conf.d/mandos"
114
#define SECKEY "seckey.txt"
115
#define PUBKEY "pubkey.txt"
116
101
117
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
118
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
119
const char *argp_program_version = "mandos-client " VERSION;
105
120
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
121
107
122
/* Used for passing in values through the Avahi callback functions */
112
127
unsigned int dh_bits;
113
128
gnutls_dh_params_t dh_params;
114
129
const char *priority;
130
gpgme_ctx_t ctx;
115
131
} mandos_context;
116
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
117
138
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
120
* "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.
121
142
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
143
size_t incbuffer(char **buffer, size_t buffer_length,
123
144
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
145
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
146
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
147
if(buffer == NULL){
127
148
return 0;
128
149
}
129
150
buffer_capacity += BUFFER_SIZE;
132
153
}
133
154
134
155
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
156
* Initialize GPGME.
137
157
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
158
static bool init_gpgme(const char *seckey,
159
const char *pubkey, const char *tempdir){
160
int ret;
144
161
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
162
gpgme_engine_info_t engine_info;
149
163
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
164
165
/*
166
* Helper function to insert pub and seckey to the engine keyring.
167
*/
168
bool import_key(const char *filename){
169
int fd;
170
gpgme_data_t pgp_data;
171
172
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
173
if(fd == -1){
174
perror("open");
175
return false;
176
}
177
178
rc = gpgme_data_new_from_fd(&pgp_data, fd);
179
if(rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
return false;
183
}
184
185
rc = gpgme_op_import(mc.ctx, pgp_data);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
ret = (int)TEMP_FAILURE_RETRY(close(fd));
193
if(ret == -1){
194
perror("close");
195
}
196
gpgme_data_release(pgp_data);
197
return true;
198
}
199
200
if(debug){
201
fprintf(stderr, "Initialize gpgme\n");
152
202
}
153
203
154
204
/* Init GPGME */
155
205
gpgme_check_version(NULL);
156
206
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
207
if(rc != GPG_ERR_NO_ERROR){
158
208
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
209
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
210
return false;
161
211
}
162
212
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
213
/* Set GPGME home directory for the OpenPGP engine only */
214
rc = gpgme_get_engine_info(&engine_info);
215
if(rc != GPG_ERR_NO_ERROR){
166
216
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
217
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
218
return false;
169
219
}
170
220
while(engine_info != NULL){
171
221
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
222
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
223
engine_info->file_name, tempdir);
174
224
break;
175
225
}
176
226
engine_info = engine_info->next;
177
227
}
178
228
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
229
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
230
return false;
231
}
232
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&(mc.ctx));
235
if(rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
return false;
239
}
240
241
if(not import_key(pubkey) or not import_key(seckey)){
242
return false;
243
}
244
245
return true;
246
}
247
248
/*
249
* Decrypt OpenPGP data.
250
* Returns -1 on error
251
*/
252
static ssize_t pgp_packet_decrypt(const char *cryptotext,
253
size_t crypto_size,
254
char **plaintext){
255
gpgme_data_t dh_crypto, dh_plain;
256
gpgme_error_t rc;
257
ssize_t ret;
258
size_t plaintext_capacity = 0;
259
ssize_t plaintext_length = 0;
260
261
if(debug){
262
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
263
}
182
264
183
265
/* Create new GPGME data buffer from memory cryptotext */
184
266
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
267
0);
186
if (rc != GPG_ERR_NO_ERROR){
268
if(rc != GPG_ERR_NO_ERROR){
187
269
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
270
gpgme_strsource(rc), gpgme_strerror(rc));
189
271
return -1;
191
273
192
274
/* Create new empty GPGME data buffer for the plaintext */
193
275
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
276
if(rc != GPG_ERR_NO_ERROR){
195
277
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
278
gpgme_strsource(rc), gpgme_strerror(rc));
197
279
gpgme_data_release(dh_crypto);
198
280
return -1;
199
281
}
200
282
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
283
/* Decrypt data from the cryptotext data buffer to the plaintext
211
284
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
285
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
286
if(rc != GPG_ERR_NO_ERROR){
214
287
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
288
gpgme_strsource(rc), gpgme_strerror(rc));
216
289
plaintext_length = -1;
290
if(debug){
291
gpgme_decrypt_result_t result;
292
result = gpgme_op_decrypt_result(mc.ctx);
293
if(result == NULL){
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
295
} else {
296
fprintf(stderr, "Unsupported algorithm: %s\n",
297
result->unsupported_algorithm);
298
fprintf(stderr, "Wrong key usage: %u\n",
299
result->wrong_key_usage);
300
if(result->file_name != NULL){
301
fprintf(stderr, "File name: %s\n", result->file_name);
302
}
303
gpgme_recipient_t recipient;
304
recipient = result->recipients;
305
if(recipient){
306
while(recipient != NULL){
307
fprintf(stderr, "Public key algorithm: %s\n",
308
gpgme_pubkey_algo_name(recipient->pubkey_algo));
309
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
310
fprintf(stderr, "Secret key available: %s\n",
311
recipient->status == GPG_ERR_NO_SECKEY
312
? "No" : "Yes");
313
recipient = recipient->next;
314
}
315
}
316
}
317
}
217
318
goto decrypt_end;
218
319
}
219
320
221
322
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
323
}
223
324
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
240
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
247
recipient = recipient->next;
248
}
249
}
250
}
251
}
252
253
325
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
326
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
327
perror("gpgme_data_seek");
256
328
plaintext_length = -1;
257
329
goto decrypt_end;
258
330
}
259
331
260
332
*plaintext = NULL;
261
333
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
334
plaintext_capacity = incbuffer(plaintext,
263
335
(size_t)plaintext_length,
264
336
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
337
if(plaintext_capacity == 0){
338
perror("incbuffer");
267
339
plaintext_length = -1;
268
340
goto decrypt_end;
269
341
}
271
343
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
344
BUFFER_SIZE);
273
345
/* Print the data, if any */
274
if (ret == 0){
346
if(ret == 0){
275
347
/* EOF */
276
348
break;
277
349
}
282
354
}
283
355
plaintext_length += ret;
284
356
}
285
357
286
358
if(debug){
287
359
fprintf(stderr, "Decrypted password is: ");
288
360
for(ssize_t i = 0; i < plaintext_length; i++){
301
373
return plaintext_length;
302
374
}
303
375
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
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)
307
380
ret = "(unknown)";
308
381
return ret;
309
382
}
314
387
fprintf(stderr, "GnuTLS: %s", string);
315
388
}
316
389
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
390
static int init_gnutls_global(const char *pubkeyfilename,
319
391
const char *seckeyfilename){
320
392
int ret;
321
393
324
396
}
325
397
326
398
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
399
if(ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "GnuTLS global_init: %s\n",
401
safer_gnutls_strerror(ret));
330
402
return -1;
331
403
}
332
404
333
if (debug){
405
if(debug){
334
406
/* "Use a log level over 10 to enable all debugging options."
335
407
* - GnuTLS manual
336
408
*/
339
411
}
340
412
341
413
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
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();
347
422
return -1;
348
423
}
349
424
350
425
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
426
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
427
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
353
428
seckeyfilename);
354
429
}
355
430
356
431
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
432
(mc.cred, pubkeyfilename, seckeyfilename,
358
433
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
434
if(ret != GNUTLS_E_SUCCESS){
360
435
fprintf(stderr,
361
436
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
437
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
438
fprintf(stderr, "The GnuTLS error is: %s\n",
364
439
safer_gnutls_strerror(ret));
365
440
goto globalfail;
366
441
}
367
442
368
443
/* GnuTLS server initialization */
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
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));
448
goto globalfail;
449
}
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));
454
goto globalfail;
455
}
456
457
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
458
384
459
return 0;
385
460
386
461
globalfail:
387
388
gnutls_certificate_free_credentials(mc->cred);
462
463
gnutls_certificate_free_credentials(mc.cred);
389
464
gnutls_global_deinit();
465
gnutls_dh_params_deinit(mc.dh_params);
390
466
return -1;
391
392
467
}
393
468
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
469
static int init_gnutls_session(gnutls_session_t *session){
396
470
int ret;
397
471
/* GnuTLS session creation */
398
472
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
473
if(ret != GNUTLS_E_SUCCESS){
400
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
475
safer_gnutls_strerror(ret));
402
476
}
403
477
404
478
{
405
479
const char *err;
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
481
if(ret != GNUTLS_E_SUCCESS){
408
482
fprintf(stderr, "Syntax error at: %s\n", err);
409
483
fprintf(stderr, "GnuTLS error: %s\n",
410
484
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
485
gnutls_deinit(*session);
412
486
return -1;
413
487
}
414
488
}
415
489
416
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
491
mc.cred);
492
if(ret != GNUTLS_E_SUCCESS){
419
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
494
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
495
gnutls_deinit(*session);
422
496
return -1;
423
497
}
424
498
425
499
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
428
502
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
430
504
431
505
return 0;
432
506
}
438
512
/* Called when a Mandos server is found */
439
513
static int start_mandos_communication(const char *ip, uint16_t port,
440
514
AvahiIfIndex if_index,
441
mandos_context *mc){
515
int af){
442
516
int ret, tcp_sd;
443
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;
444
522
char *buffer = NULL;
445
523
char *decrypted_buffer;
446
524
size_t buffer_length = 0;
448
526
ssize_t decrypted_buffer_size;
449
527
size_t written;
450
528
int retval = 0;
451
char interface[IF_NAMESIZE];
452
529
gnutls_session_t session;
453
454
ret = init_gnutls_session (mc, &session);
455
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){
456
546
return -1;
457
547
}
458
548
459
549
if(debug){
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
550
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
461
551
"\n", ip, port);
462
552
}
463
553
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
554
tcp_sd = socket(pf, SOCK_STREAM, 0);
555
if(tcp_sd < 0){
466
556
perror("socket");
467
557
return -1;
468
558
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
476
}
477
559
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
560
memset(&to, 0, sizeof(to));
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 ){
484
569
perror("inet_pton");
485
570
return -1;
486
571
}
488
573
fprintf(stderr, "Bad address: %s\n", ip);
489
574
return -1;
490
575
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
492
493
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
}
494
597
495
598
if(debug){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
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){
501
622
perror("inet_ntop");
502
623
} else {
503
624
if(strcmp(addrstr, ip) != 0){
506
627
}
507
628
}
508
629
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
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){
511
636
perror("connect");
512
637
return -1;
513
638
}
514
639
515
640
const char *out = mandos_protocol_version;
516
641
written = 0;
517
while (true){
642
while(true){
518
643
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
644
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
645
out_size - written));
521
if (ret == -1){
646
if(ret == -1){
522
647
perror("write");
523
648
retval = -1;
524
649
goto mandos_end;
527
652
if(written < out_size){
528
653
continue;
529
654
} else {
530
if (out == mandos_protocol_version){
655
if(out == mandos_protocol_version){
531
656
written = 0;
532
657
out = "\r\n";
533
658
} else {
535
660
}
536
661
}
537
662
}
538
663
539
664
if(debug){
540
665
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
666
}
542
667
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
668
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
669
545
670
do{
546
ret = gnutls_handshake (session);
671
ret = gnutls_handshake(session);
547
672
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
673
549
if (ret != GNUTLS_E_SUCCESS){
674
if(ret != GNUTLS_E_SUCCESS){
550
675
if(debug){
551
676
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
677
gnutls_perror(ret);
553
678
}
554
679
retval = -1;
555
680
goto mandos_end;
558
683
/* Read OpenPGP packet that contains the wanted password */
559
684
560
685
if(debug){
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
686
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
562
687
ip);
563
688
}
564
689
565
690
while(true){
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
691
buffer_capacity = incbuffer(&buffer, buffer_length,
567
692
buffer_capacity);
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
693
if(buffer_capacity == 0){
694
perror("incbuffer");
570
695
retval = -1;
571
696
goto mandos_end;
572
697
}
573
698
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
699
sret = gnutls_record_recv(session, buffer+buffer_length,
700
BUFFER_SIZE);
701
if(sret == 0){
577
702
break;
578
703
}
579
if (ret < 0){
580
switch(ret){
704
if(sret < 0){
705
switch(sret){
581
706
case GNUTLS_E_INTERRUPTED:
582
707
case GNUTLS_E_AGAIN:
583
708
break;
584
709
case GNUTLS_E_REHANDSHAKE:
585
710
do{
586
ret = gnutls_handshake (session);
711
ret = gnutls_handshake(session);
587
712
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
if (ret < 0){
713
if(ret < 0){
589
714
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
715
gnutls_perror(ret);
591
716
retval = -1;
592
717
goto mandos_end;
593
718
}
596
721
fprintf(stderr, "Unknown error while reading data from"
597
722
" encrypted session with Mandos server\n");
598
723
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
724
gnutls_bye(session, GNUTLS_SHUT_RDWR);
600
725
goto mandos_end;
601
726
}
602
727
} else {
603
buffer_length += (size_t) ret;
728
buffer_length += (size_t) sret;
604
729
}
605
730
}
606
731
608
733
fprintf(stderr, "Closing TLS session\n");
609
734
}
610
735
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
612
737
613
if (buffer_length > 0){
738
if(buffer_length > 0){
614
739
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
740
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
741
&decrypted_buffer);
742
if(decrypted_buffer_size >= 0){
619
743
written = 0;
620
744
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
745
ret = (int)fwrite(decrypted_buffer + written, 1,
746
(size_t)decrypted_buffer_size - written,
747
stdout);
624
748
if(ret == 0 and ferror(stdout)){
625
749
if(debug){
626
750
fprintf(stderr, "Error writing encrypted data: %s\n",
635
759
} else {
636
760
retval = -1;
637
761
}
762
} else {
763
retval = -1;
638
764
}
639
765
640
766
/* Shutdown procedure */
641
767
642
768
mandos_end:
643
769
free(buffer);
644
close(tcp_sd);
645
gnutls_deinit (session);
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
771
if(ret == -1){
772
perror("close");
773
}
774
gnutls_deinit(session);
646
775
return retval;
647
776
}
648
777
649
778
static void resolve_callback(AvahiSServiceResolver *r,
650
779
AvahiIfIndex interface,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
780
AvahiProtocol proto,
652
781
AvahiResolverEvent event,
653
782
const char *name,
654
783
const char *type,
659
788
AVAHI_GCC_UNUSED AvahiStringList *txt,
660
789
AVAHI_GCC_UNUSED AvahiLookupResultFlags
661
790
flags,
662
void* userdata) {
663
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
791
__attribute__((unused)) void* userdata){
792
assert(r);
665
793
666
794
/* Called whenever a service has been resolved successfully or
667
795
timed out */
668
796
669
switch (event) {
797
switch(event){
670
798
default:
671
799
case AVAHI_RESOLVER_FAILURE:
672
800
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
673
801
" of type '%s' in domain '%s': %s\n", name, type, domain,
674
avahi_strerror(avahi_server_errno(mc->server)));
802
avahi_strerror(avahi_server_errno(mc.server)));
675
803
break;
676
804
677
805
case AVAHI_RESOLVER_FOUND:
680
808
avahi_address_snprint(ip, sizeof(ip), address);
681
809
if(debug){
682
810
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
811
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
812
ip, (intmax_t)interface, port);
685
813
}
686
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
688
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);
689
818
}
690
819
}
691
820
}
692
821
avahi_s_service_resolver_free(r);
693
822
}
694
823
695
static void browse_callback( AvahiSServiceBrowser *b,
696
AvahiIfIndex interface,
697
AvahiProtocol protocol,
698
AvahiBrowserEvent event,
699
const char *name,
700
const char *type,
701
const char *domain,
702
AVAHI_GCC_UNUSED AvahiLookupResultFlags
703
flags,
704
void* userdata) {
705
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
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){
834
assert(b);
707
835
708
836
/* Called whenever a new services becomes available on the LAN or
709
837
is removed from the LAN */
710
838
711
switch (event) {
839
switch(event){
712
840
default:
713
841
case AVAHI_BROWSER_FAILURE:
714
842
715
843
fprintf(stderr, "(Avahi browser) %s\n",
716
avahi_strerror(avahi_server_errno(mc->server)));
717
avahi_simple_poll_quit(mc->simple_poll);
844
avahi_strerror(avahi_server_errno(mc.server)));
845
avahi_simple_poll_quit(mc.simple_poll);
718
846
return;
719
847
720
848
case AVAHI_BROWSER_NEW:
723
851
the callback function is called the Avahi server will free the
724
852
resolver for us. */
725
853
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
854
if(!(avahi_s_service_resolver_new(mc.server, interface,
727
855
protocol, name, type, domain,
728
856
AVAHI_PROTO_INET6, 0,
729
resolve_callback, mc)))
857
resolve_callback, NULL)))
730
858
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
731
name, avahi_strerror(avahi_server_errno(mc->server)));
859
name, avahi_strerror(avahi_server_errno(mc.server)));
732
860
break;
733
861
734
862
case AVAHI_BROWSER_REMOVE:
743
871
}
744
872
}
745
873
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
749
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
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;
755
879
}
756
880
757
758
881
int main(int argc, char *argv[]){
759
AvahiSServiceBrowser *sb = NULL;
760
int error;
761
int ret;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
765
int sd;
766
uid_t uid;
767
gid_t gid;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
777
778
{
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
785
.group = 1 },
786
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
793
.group = 1 },
794
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
797
.group = 1 },
798
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
801
.group = 2 },
802
{ .name = "dh-bits", .key = 129,
803
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
805
.group = 2 },
806
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
809
{ .name = NULL }
810
};
811
812
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
819
debug = true;
820
break;
821
case 'c':
822
connect_to = arg;
823
break;
824
case 'i':
825
interface = arg;
826
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
841
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");
842
1086
}
843
break;
844
case 130:
845
mc.priority = arg;
846
break;
847
case ARGP_KEY_ARG:
848
argp_usage (state);
849
case ARGP_KEY_END:
850
break;
851
default:
852
return ARGP_ERR_UNKNOWN;
853
1087
}
854
return 0;
855
}
856
857
struct argp argp = { .options = options, .parser = parse_opt,
858
.args_doc = "",
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
865
goto end;
866
}
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
891
892
/* If the interface is down, bring it up */
893
{
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
895
if(sd < 0) {
896
perror("socket");
897
exitcode = EXIT_FAILURE;
898
goto end;
899
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
1088
#endif
1089
goto end;
1090
}
1091
}
1092
/* sleep checking until interface is running */
1093
for(int i=0; i < delay * 4; i++){
901
1094
ret = ioctl(sd, SIOCGIFFLAGS, &network);
902
1095
if(ret == -1){
903
1096
perror("ioctl SIOCGIFFLAGS");
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
910
if(ret == -1){
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
913
goto end;
914
}
915
}
916
close(sd);
917
}
918
919
uid = getuid();
920
gid = getgid();
921
922
ret = setuid(uid);
923
if (ret == -1){
924
perror("setuid");
925
}
926
927
setgid(gid);
928
if (ret == -1){
929
perror("setgid");
930
}
931
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);
1114
if(ret == -1){
1115
perror("klogctl");
1116
}
1117
}
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'){
932
1159
if_index = (AvahiIfIndex) if_nametoindex(interface);
933
1160
if(if_index == 0){
934
1161
fprintf(stderr, "No such interface: \"%s\"\n", interface);
935
exit(EXIT_FAILURE);
936
}
937
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
942
if(address == NULL){
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
945
goto end;
946
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
952
goto end;
953
}
954
*address = '\0';
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
957
if(ret < 0){
958
exitcode = EXIT_FAILURE;
959
} else {
960
exitcode = EXIT_SUCCESS;
961
}
962
goto end;
963
}
964
965
if (not debug){
966
avahi_set_log_function(empty_log);
967
}
968
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
971
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
976
" object.\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
}
980
981
{
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
989
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
993
NULL, &error);
994
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
997
}
998
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
AVAHI_PROTO_INET6,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1012
if (sb == NULL) {
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
1019
/* Run the main loop */
1020
1021
if (debug){
1022
fprintf(stderr, "Starting Avahi loop search\n");
1023
}
1024
1025
avahi_simple_poll_loop(mc.simple_poll);
1026
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
1027
1249
end:
1028
1029
if (debug){
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1031
}
1032
1033
/* Cleanup things */
1034
if (sb != NULL)
1035
avahi_s_service_browser_free(sb);
1036
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1048
}
1049
1050
return exitcode;
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){
1282
perror("opendir");
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;
1051
1320
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0