To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 349
- compare with another revision
- download diff
- download tarball
- view history from revision 349
- Committer: Teddy Hogeborn
- Date: 2009-06-02 10:33:04 UTC
- Revision ID: teddy@fukt.bsnet.se-20090602103304-k6eokrft7wr00255
* plugins.d/mandos-client.c (pgp_packet_decrypt): Remove redundant
"if" statement.
"if" statement.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- 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
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
55
64
#include <assert.h> /* assert() */
56
65
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
58
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
68
SIOCSIFFLAGS, if_indextoname(),
60
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
61
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
74
getuid(), getgid(), setuid(),
63
75
setgid() */
64
#include <netinet/in.h>
65
76
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
67
78
#include <argp.h> /* struct argp_option, error_t, struct
68
79
argp_state, struct argp,
69
80
argp_parse(), ARGP_KEY_ARG,
70
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
71
89
72
90
/* Avahi */
73
91
/* All Avahi types, constants and functions
86
104
gnutls_*
87
105
init_gnutls_session(),
88
106
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
90
109
GNUTLS_OPENPGP_FMT_BASE64 */
91
110
92
111
/* GPGME */
98
117
99
118
#define BUFFER_SIZE 256
100
119
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
101
124
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
125
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
126
const char *argp_program_version = "mandos-client " VERSION;
105
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
128
107
129
/* Used for passing in values through the Avahi callback functions */
112
134
unsigned int dh_bits;
113
135
gnutls_dh_params_t dh_params;
114
136
const char *priority;
137
gpgme_ctx_t ctx;
115
138
} mandos_context;
116
139
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
117
145
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
120
148
* "buffer_length" is how much is already used.
121
149
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
123
151
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
154
if(buffer == NULL){
127
155
return 0;
128
156
}
129
157
buffer_capacity += BUFFER_SIZE;
132
160
}
133
161
134
162
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
163
* Initialize GPGME.
137
164
*/
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;
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
144
168
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
169
gpgme_engine_info_t engine_info;
149
170
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
171
172
/*
173
* Helper function to insert pub and seckey to the engine keyring.
174
*/
175
bool import_key(const char *filename){
176
int fd;
177
gpgme_data_t pgp_data;
178
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
if(fd == -1){
181
perror("open");
182
return false;
183
}
184
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
if(ret == -1){
201
perror("close");
202
}
203
gpgme_data_release(pgp_data);
204
return true;
205
}
206
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
152
209
}
153
210
154
211
/* Init GPGME */
155
212
gpgme_check_version(NULL);
156
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
158
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
216
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
217
return false;
161
218
}
162
219
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){
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
166
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
224
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
225
return false;
169
226
}
170
227
while(engine_info != NULL){
171
228
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
229
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
230
engine_info->file_name, tempdir);
174
231
break;
175
232
}
176
233
engine_info = engine_info->next;
177
234
}
178
235
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
270
}
182
271
183
272
/* Create new GPGME data buffer from memory cryptotext */
184
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
274
0);
186
if (rc != GPG_ERR_NO_ERROR){
275
if(rc != GPG_ERR_NO_ERROR){
187
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
277
gpgme_strsource(rc), gpgme_strerror(rc));
189
278
return -1;
191
280
192
281
/* Create new empty GPGME data buffer for the plaintext */
193
282
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
195
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
285
gpgme_strsource(rc), gpgme_strerror(rc));
197
286
gpgme_data_release(dh_crypto);
198
287
return -1;
199
288
}
200
289
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
290
/* Decrypt data from the cryptotext data buffer to the plaintext
211
291
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
214
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
295
gpgme_strsource(rc), gpgme_strerror(rc));
216
296
plaintext_length = -1;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
223
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){
297
if(debug){
298
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
307
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
309
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
240
312
while(recipient != NULL){
241
313
fprintf(stderr, "Public key algorithm: %s\n",
242
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
248
320
}
249
321
}
250
322
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
251
328
}
252
329
253
330
/* 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");
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
256
333
plaintext_length = -1;
257
334
goto decrypt_end;
258
335
}
259
336
260
337
*plaintext = NULL;
261
338
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
263
340
(size_t)plaintext_length,
264
341
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
267
344
plaintext_length = -1;
268
345
goto decrypt_end;
269
346
}
271
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
349
BUFFER_SIZE);
273
350
/* Print the data, if any */
274
if (ret == 0){
351
if(ret == 0){
275
352
/* EOF */
276
353
break;
277
354
}
282
359
}
283
360
plaintext_length += ret;
284
361
}
285
362
286
363
if(debug){
287
364
fprintf(stderr, "Decrypted password is: ");
288
365
for(ssize_t i = 0; i < plaintext_length; i++){
301
378
return plaintext_length;
302
379
}
303
380
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
307
385
ret = "(unknown)";
308
386
return ret;
309
387
}
314
392
fprintf(stderr, "GnuTLS: %s", string);
315
393
}
316
394
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
319
396
const char *seckeyfilename){
320
397
int ret;
321
398
324
401
}
325
402
326
403
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
330
407
return -1;
331
408
}
332
409
333
if (debug){
410
if(debug){
334
411
/* "Use a log level over 10 to enable all debugging options."
335
412
* - GnuTLS manual
336
413
*/
339
416
}
340
417
341
418
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
warning */
346
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
348
427
return -1;
349
428
}
350
429
351
430
if(debug){
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
354
433
seckeyfilename);
355
434
}
356
435
357
436
ret = gnutls_certificate_set_openpgp_key_file
358
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
359
438
GNUTLS_OPENPGP_FMT_BASE64);
360
if (ret != GNUTLS_E_SUCCESS) {
439
if(ret != GNUTLS_E_SUCCESS){
361
440
fprintf(stderr,
362
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
443
fprintf(stderr, "The GnuTLS error is: %s\n",
365
444
safer_gnutls_strerror(ret));
366
445
goto globalfail;
367
446
}
368
447
369
448
/* GnuTLS server initialization */
370
ret = gnutls_dh_params_init(&mc->dh_params);
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
374
goto globalfail;
375
}
376
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
380
goto globalfail;
381
}
382
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
384
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
463
385
464
return 0;
386
465
387
466
globalfail:
388
389
gnutls_certificate_free_credentials(mc->cred);
467
468
gnutls_certificate_free_credentials(mc.cred);
390
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
391
471
return -1;
392
393
472
}
394
473
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
397
475
int ret;
398
476
/* GnuTLS session creation */
399
477
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
478
if(ret != GNUTLS_E_SUCCESS){
401
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
402
480
safer_gnutls_strerror(ret));
403
481
}
404
482
405
483
{
406
484
const char *err;
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
409
487
fprintf(stderr, "Syntax error at: %s\n", err);
410
488
fprintf(stderr, "GnuTLS error: %s\n",
411
489
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
490
gnutls_deinit(*session);
413
491
return -1;
414
492
}
415
493
}
416
494
417
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
mc->cred);
419
if (ret != GNUTLS_E_SUCCESS) {
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
420
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
421
499
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
500
gnutls_deinit(*session);
423
501
return -1;
424
502
}
425
503
426
504
/* ignore client certificate if any. */
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
429
507
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
431
509
432
510
return 0;
433
511
}
439
517
/* Called when a Mandos server is found */
440
518
static int start_mandos_communication(const char *ip, uint16_t port,
441
519
AvahiIfIndex if_index,
442
mandos_context *mc){
520
int af){
443
521
int ret, tcp_sd;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
522
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
445
527
char *buffer = NULL;
446
528
char *decrypted_buffer;
447
529
size_t buffer_length = 0;
449
531
ssize_t decrypted_buffer_size;
450
532
size_t written;
451
533
int retval = 0;
452
char interface[IF_NAMESIZE];
453
534
gnutls_session_t session;
454
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
535
int pf; /* Protocol family */
536
537
switch(af){
538
case AF_INET6:
539
pf = PF_INET6;
540
break;
541
case AF_INET:
542
pf = PF_INET;
543
break;
544
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
546
return -1;
547
}
548
549
ret = init_gnutls_session(&session);
550
if(ret != 0){
457
551
return -1;
458
552
}
459
553
460
554
if(debug){
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
462
556
"\n", ip, port);
463
557
}
464
558
465
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
466
if(tcp_sd < 0) {
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
560
if(tcp_sd < 0){
467
561
perror("socket");
468
562
return -1;
469
563
}
470
471
if(debug){
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
perror("if_indextoname");
474
return -1;
475
}
476
fprintf(stderr, "Binding to interface %s\n", interface);
477
}
478
564
479
565
memset(&to, 0, sizeof(to));
480
to.in6.sin6_family = AF_INET6;
481
/* It would be nice to have a way to detect if we were passed an
482
IPv4 address here. Now we assume an IPv6 address. */
483
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
484
if (ret < 0 ){
566
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
569
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
572
}
573
if(ret < 0 ){
485
574
perror("inet_pton");
486
575
return -1;
487
576
}
489
578
fprintf(stderr, "Bad address: %s\n", ip);
490
579
return -1;
491
580
}
492
to.in6.sin6_port = htons(port); /* Spurious warning */
493
494
to.in6.sin6_scope_id = (uint32_t)if_index;
581
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
593
}
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
596
}
597
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
601
}
495
602
496
603
if(debug){
497
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
498
port);
499
char addrstr[INET6_ADDRSTRLEN] = "";
500
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
501
sizeof(addrstr)) == NULL){
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
608
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
611
}
612
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
615
}
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
502
627
perror("inet_ntop");
503
628
} else {
504
629
if(strcmp(addrstr, ip) != 0){
507
632
}
508
633
}
509
634
510
ret = connect(tcp_sd, &to.in, sizeof(to));
511
if (ret < 0){
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
512
641
perror("connect");
513
642
return -1;
514
643
}
515
644
516
645
const char *out = mandos_protocol_version;
517
646
written = 0;
518
while (true){
647
while(true){
519
648
size_t out_size = strlen(out);
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
650
out_size - written));
522
if (ret == -1){
651
if(ret == -1){
523
652
perror("write");
524
653
retval = -1;
525
654
goto mandos_end;
528
657
if(written < out_size){
529
658
continue;
530
659
} else {
531
if (out == mandos_protocol_version){
660
if(out == mandos_protocol_version){
532
661
written = 0;
533
662
out = "\r\n";
534
663
} else {
536
665
}
537
666
}
538
667
}
539
668
540
669
if(debug){
541
670
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
671
}
543
672
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
546
675
do{
547
ret = gnutls_handshake (session);
676
ret = gnutls_handshake(session);
548
677
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
549
678
550
if (ret != GNUTLS_E_SUCCESS){
679
if(ret != GNUTLS_E_SUCCESS){
551
680
if(debug){
552
681
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
553
gnutls_perror (ret);
682
gnutls_perror(ret);
554
683
}
555
684
retval = -1;
556
685
goto mandos_end;
559
688
/* Read OpenPGP packet that contains the wanted password */
560
689
561
690
if(debug){
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
563
692
ip);
564
693
}
565
694
566
695
while(true){
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
696
buffer_capacity = incbuffer(&buffer, buffer_length,
568
697
buffer_capacity);
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
698
if(buffer_capacity == 0){
699
perror("incbuffer");
571
700
retval = -1;
572
701
goto mandos_end;
573
702
}
574
703
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
577
if (ret == 0){
704
sret = gnutls_record_recv(session, buffer+buffer_length,
705
BUFFER_SIZE);
706
if(sret == 0){
578
707
break;
579
708
}
580
if (ret < 0){
581
switch(ret){
709
if(sret < 0){
710
switch(sret){
582
711
case GNUTLS_E_INTERRUPTED:
583
712
case GNUTLS_E_AGAIN:
584
713
break;
585
714
case GNUTLS_E_REHANDSHAKE:
586
715
do{
587
ret = gnutls_handshake (session);
716
ret = gnutls_handshake(session);
588
717
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
589
if (ret < 0){
718
if(ret < 0){
590
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
591
gnutls_perror (ret);
720
gnutls_perror(ret);
592
721
retval = -1;
593
722
goto mandos_end;
594
723
}
597
726
fprintf(stderr, "Unknown error while reading data from"
598
727
" encrypted session with Mandos server\n");
599
728
retval = -1;
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
601
730
goto mandos_end;
602
731
}
603
732
} else {
604
buffer_length += (size_t) ret;
733
buffer_length += (size_t) sret;
605
734
}
606
735
}
607
736
609
738
fprintf(stderr, "Closing TLS session\n");
610
739
}
611
740
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
613
742
614
if (buffer_length > 0){
743
if(buffer_length > 0){
615
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
616
745
buffer_length,
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
746
&decrypted_buffer);
747
if(decrypted_buffer_size >= 0){
620
748
written = 0;
621
749
while(written < (size_t) decrypted_buffer_size){
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
752
stdout);
625
753
if(ret == 0 and ferror(stdout)){
626
754
if(debug){
627
755
fprintf(stderr, "Error writing encrypted data: %s\n",
636
764
} else {
637
765
retval = -1;
638
766
}
767
} else {
768
retval = -1;
639
769
}
640
770
641
771
/* Shutdown procedure */
642
772
643
773
mandos_end:
644
774
free(buffer);
645
close(tcp_sd);
646
gnutls_deinit (session);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
778
}
779
gnutls_deinit(session);
647
780
return retval;
648
781
}
649
782
650
783
static void resolve_callback(AvahiSServiceResolver *r,
651
784
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
785
AvahiProtocol proto,
653
786
AvahiResolverEvent event,
654
787
const char *name,
655
788
const char *type,
660
793
AVAHI_GCC_UNUSED AvahiStringList *txt,
661
794
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
795
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
796
AVAHI_GCC_UNUSED void* userdata){
665
797
assert(r);
666
798
667
799
/* Called whenever a service has been resolved successfully or
668
800
timed out */
669
801
670
switch (event) {
802
switch(event){
671
803
default:
672
804
case AVAHI_RESOLVER_FAILURE:
673
805
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
806
" of type '%s' in domain '%s': %s\n", name, type, domain,
675
avahi_strerror(avahi_server_errno(mc->server)));
807
avahi_strerror(avahi_server_errno(mc.server)));
676
808
break;
677
809
678
810
case AVAHI_RESOLVER_FOUND:
681
813
avahi_address_snprint(ip, sizeof(ip), address);
682
814
if(debug){
683
815
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
816
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
817
ip, (intmax_t)interface, port);
686
818
}
687
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
819
int ret = start_mandos_communication(ip, port, interface,
820
avahi_proto_to_af(proto));
821
if(ret == 0){
822
avahi_simple_poll_quit(mc.simple_poll);
690
823
}
691
824
}
692
825
}
693
826
avahi_s_service_resolver_free(r);
694
827
}
695
828
696
static void browse_callback( AvahiSServiceBrowser *b,
697
AvahiIfIndex interface,
698
AvahiProtocol protocol,
699
AvahiBrowserEvent event,
700
const char *name,
701
const char *type,
702
const char *domain,
703
AVAHI_GCC_UNUSED AvahiLookupResultFlags
704
flags,
705
void* userdata) {
706
mandos_context *mc = userdata;
829
static void browse_callback(AvahiSServiceBrowser *b,
830
AvahiIfIndex interface,
831
AvahiProtocol protocol,
832
AvahiBrowserEvent event,
833
const char *name,
834
const char *type,
835
const char *domain,
836
AVAHI_GCC_UNUSED AvahiLookupResultFlags
837
flags,
838
AVAHI_GCC_UNUSED void* userdata){
707
839
assert(b);
708
840
709
841
/* Called whenever a new services becomes available on the LAN or
710
842
is removed from the LAN */
711
843
712
switch (event) {
844
switch(event){
713
845
default:
714
846
case AVAHI_BROWSER_FAILURE:
715
847
716
848
fprintf(stderr, "(Avahi browser) %s\n",
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
849
avahi_strerror(avahi_server_errno(mc.server)));
850
avahi_simple_poll_quit(mc.simple_poll);
719
851
return;
720
852
721
853
case AVAHI_BROWSER_NEW:
724
856
the callback function is called the Avahi server will free the
725
857
resolver for us. */
726
858
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
728
protocol, name, type, domain,
729
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
859
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
860
name, type, domain, protocol, 0,
861
resolve_callback, NULL) == NULL)
731
862
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
863
name, avahi_strerror(avahi_server_errno(mc.server)));
733
864
break;
734
865
735
866
case AVAHI_BROWSER_REMOVE:
744
875
}
745
876
}
746
877
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
878
sig_atomic_t quit_now = 0;
879
880
/* stop main loop after sigterm has been called */
881
static void handle_sigterm(__attribute__((unused)) int sig){
882
if(quit_now){
883
return;
884
}
885
quit_now = 1;
886
int old_errno = errno;
887
if(mc.simple_poll != NULL){
888
avahi_simple_poll_quit(mc.simple_poll);
889
}
890
errno = old_errno;
891
}
892
893
int main(int argc, char *argv[]){
894
AvahiSServiceBrowser *sb = NULL;
895
int error;
896
int ret;
897
intmax_t tmpmax;
750
898
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
756
}
757
758
759
int main(int argc, char *argv[]){
760
AvahiSServiceBrowser *sb = NULL;
761
int error;
762
int ret;
763
int exitcode = EXIT_SUCCESS;
764
const char *interface = "eth0";
765
struct ifreq network;
766
int sd;
767
uid_t uid;
768
gid_t gid;
769
char *connect_to = NULL;
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"};
777
bool gnutls_initalized = false;
778
779
{
780
struct argp_option options[] = {
781
{ .name = "debug", .key = 128,
782
.doc = "Debug mode", .group = 3 },
783
{ .name = "connect", .key = 'c',
784
.arg = "IP",
785
.doc = "Connect directly to a sepcified mandos server",
786
.group = 1 },
787
{ .name = "interface", .key = 'i',
788
.arg = "INTERFACE",
789
.doc = "Interface that Avahi will conntect through",
790
.group = 1 },
791
{ .name = "keydir", .key = 'd',
792
.arg = "KEYDIR",
793
.doc = "Directory where the openpgp keyring is",
794
.group = 1 },
795
{ .name = "seckey", .key = 's',
796
.arg = "SECKEY",
797
.doc = "Secret openpgp key for gnutls authentication",
798
.group = 1 },
799
{ .name = "pubkey", .key = 'p',
800
.arg = "PUBKEY",
801
.doc = "Public openpgp key for gnutls authentication",
802
.group = 2 },
803
{ .name = "dh-bits", .key = 129,
804
.arg = "BITS",
805
.doc = "dh-bits to use in gnutls communication",
806
.group = 2 },
807
{ .name = "priority", .key = 130,
808
.arg = "PRIORITY",
809
.doc = "GNUTLS priority", .group = 1 },
810
{ .name = NULL }
811
};
812
813
814
error_t parse_opt (int key, char *arg,
815
struct argp_state *state) {
816
/* Get the INPUT argument from `argp_parse', which we know is
817
a pointer to our plugin list pointer. */
818
switch (key) {
819
case 128:
820
debug = true;
821
break;
822
case 'c':
823
connect_to = arg;
824
break;
825
case 'i':
826
interface = arg;
827
break;
828
case 'd':
829
keydir = arg;
830
break;
831
case 's':
832
seckeyname = arg;
833
break;
834
case 'p':
835
pubkeyname = arg;
836
break;
837
case 129:
838
errno = 0;
839
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
840
if (errno){
841
perror("strtol");
842
exit(EXIT_FAILURE);
899
int exitcode = EXIT_SUCCESS;
900
const char *interface = "eth0";
901
struct ifreq network;
902
int sd;
903
uid_t uid;
904
gid_t gid;
905
char *connect_to = NULL;
906
char tempdir[] = "/tmp/mandosXXXXXX";
907
bool tempdir_created = false;
908
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
909
const char *seckey = PATHDIR "/" SECKEY;
910
const char *pubkey = PATHDIR "/" PUBKEY;
911
912
bool gnutls_initialized = false;
913
bool gpgme_initialized = false;
914
float delay = 2.5f;
915
916
struct sigaction old_sigterm_action;
917
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
918
919
{
920
struct argp_option options[] = {
921
{ .name = "debug", .key = 128,
922
.doc = "Debug mode", .group = 3 },
923
{ .name = "connect", .key = 'c',
924
.arg = "ADDRESS:PORT",
925
.doc = "Connect directly to a specific Mandos server",
926
.group = 1 },
927
{ .name = "interface", .key = 'i',
928
.arg = "NAME",
929
.doc = "Network interface that will be used to search for"
930
" Mandos servers",
931
.group = 1 },
932
{ .name = "seckey", .key = 's',
933
.arg = "FILE",
934
.doc = "OpenPGP secret key file base name",
935
.group = 1 },
936
{ .name = "pubkey", .key = 'p',
937
.arg = "FILE",
938
.doc = "OpenPGP public key file base name",
939
.group = 2 },
940
{ .name = "dh-bits", .key = 129,
941
.arg = "BITS",
942
.doc = "Bit length of the prime number used in the"
943
" Diffie-Hellman key exchange",
944
.group = 2 },
945
{ .name = "priority", .key = 130,
946
.arg = "STRING",
947
.doc = "GnuTLS priority string for the TLS handshake",
948
.group = 1 },
949
{ .name = "delay", .key = 131,
950
.arg = "SECONDS",
951
.doc = "Maximum delay to wait for interface startup",
952
.group = 2 },
953
{ .name = NULL }
954
};
955
956
error_t parse_opt(int key, char *arg,
957
struct argp_state *state){
958
switch(key){
959
case 128: /* --debug */
960
debug = true;
961
break;
962
case 'c': /* --connect */
963
connect_to = arg;
964
break;
965
case 'i': /* --interface */
966
interface = arg;
967
break;
968
case 's': /* --seckey */
969
seckey = arg;
970
break;
971
case 'p': /* --pubkey */
972
pubkey = arg;
973
break;
974
case 129: /* --dh-bits */
975
errno = 0;
976
tmpmax = strtoimax(arg, &tmp, 10);
977
if(errno != 0 or tmp == arg or *tmp != '\0'
978
or tmpmax != (typeof(mc.dh_bits))tmpmax){
979
fprintf(stderr, "Bad number of DH bits\n");
980
exit(EXIT_FAILURE);
981
}
982
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
983
break;
984
case 130: /* --priority */
985
mc.priority = arg;
986
break;
987
case 131: /* --delay */
988
errno = 0;
989
delay = strtof(arg, &tmp);
990
if(errno != 0 or tmp == arg or *tmp != '\0'){
991
fprintf(stderr, "Bad delay\n");
992
exit(EXIT_FAILURE);
993
}
994
break;
995
case ARGP_KEY_ARG:
996
argp_usage(state);
997
case ARGP_KEY_END:
998
break;
999
default:
1000
return ARGP_ERR_UNKNOWN;
1001
}
1002
return 0;
1003
}
1004
1005
struct argp argp = { .options = options, .parser = parse_opt,
1006
.args_doc = "",
1007
.doc = "Mandos client -- Get and decrypt"
1008
" passwords from a Mandos server" };
1009
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1010
if(ret == ARGP_ERR_UNKNOWN){
1011
fprintf(stderr, "Unknown error while parsing arguments\n");
1012
exitcode = EXIT_FAILURE;
1013
goto end;
1014
}
1015
}
1016
1017
if(not debug){
1018
avahi_set_log_function(empty_log);
1019
}
1020
1021
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1022
from the signal handler */
1023
/* Initialize the pseudo-RNG for Avahi */
1024
srand((unsigned int) time(NULL));
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if(mc.simple_poll == NULL){
1027
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1028
exitcode = EXIT_FAILURE;
1029
goto end;
1030
}
1031
1032
sigemptyset(&sigterm_action.sa_mask);
1033
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1034
if(ret == -1){
1035
perror("sigaddset");
1036
exitcode = EXIT_FAILURE;
1037
goto end;
1038
}
1039
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1040
if(ret == -1){
1041
perror("sigaddset");
1042
exitcode = EXIT_FAILURE;
1043
goto end;
1044
}
1045
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1046
if(ret == -1){
1047
perror("sigaddset");
1048
exitcode = EXIT_FAILURE;
1049
goto end;
1050
}
1051
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1052
if(ret == -1){
1053
perror("sigaction");
1054
exitcode = EXIT_FAILURE;
1055
goto end;
1056
}
1057
1058
/* If the interface is down, bring it up */
1059
if(interface[0] != '\0'){
1060
#ifdef __linux__
1061
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1062
messages to mess up the prompt */
1063
ret = klogctl(8, NULL, 5);
1064
bool restore_loglevel = true;
1065
if(ret == -1){
1066
restore_loglevel = false;
1067
perror("klogctl");
1068
}
1069
#endif /* __linux__ */
1070
1071
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1072
if(sd < 0){
1073
perror("socket");
1074
exitcode = EXIT_FAILURE;
1075
#ifdef __linux__
1076
if(restore_loglevel){
1077
ret = klogctl(7, NULL, 0);
1078
if(ret == -1){
1079
perror("klogctl");
1080
}
1081
}
1082
#endif /* __linux__ */
1083
goto end;
1084
}
1085
strcpy(network.ifr_name, interface);
1086
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1087
if(ret == -1){
1088
perror("ioctl SIOCGIFFLAGS");
1089
#ifdef __linux__
1090
if(restore_loglevel){
1091
ret = klogctl(7, NULL, 0);
1092
if(ret == -1){
1093
perror("klogctl");
1094
}
1095
}
1096
#endif /* __linux__ */
1097
exitcode = EXIT_FAILURE;
1098
goto end;
1099
}
1100
if((network.ifr_flags & IFF_UP) == 0){
1101
network.ifr_flags |= IFF_UP;
1102
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1103
if(ret == -1){
1104
perror("ioctl SIOCSIFFLAGS");
1105
exitcode = EXIT_FAILURE;
1106
#ifdef __linux__
1107
if(restore_loglevel){
1108
ret = klogctl(7, NULL, 0);
1109
if(ret == -1){
1110
perror("klogctl");
843
1111
}
844
break;
845
case 130:
846
mc.priority = arg;
847
break;
848
case ARGP_KEY_ARG:
849
argp_usage (state);
850
case ARGP_KEY_END:
851
break;
852
default:
853
return ARGP_ERR_UNKNOWN;
854
1112
}
855
return 0;
856
}
857
858
struct argp argp = { .options = options, .parser = parse_opt,
859
.args_doc = "",
860
.doc = "Mandos client -- Get and decrypt"
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
864
fprintf(stderr, "Unknown error while parsing arguments\n");
865
exitcode = EXIT_FAILURE;
866
goto end;
867
}
868
}
869
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
874
goto end;
875
}
876
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
881
goto end;
882
}
883
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
if (ret == -1){
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
} else {
890
gnutls_initalized = true;
891
}
892
893
/* If the interface is down, bring it up */
894
{
895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
896
if(sd < 0) {
897
perror("socket");
898
exitcode = EXIT_FAILURE;
899
goto end;
900
}
901
strcpy(network.ifr_name, interface);
1113
#endif /* __linux__ */
1114
goto end;
1115
}
1116
}
1117
/* sleep checking until interface is running */
1118
for(int i=0; i < delay * 4; i++){
902
1119
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
1120
if(ret == -1){
904
1121
perror("ioctl SIOCGIFFLAGS");
905
exitcode = EXIT_FAILURE;
906
goto end;
907
}
908
if((network.ifr_flags & IFF_UP) == 0){
909
network.ifr_flags |= IFF_UP;
910
ret = ioctl(sd, SIOCSIFFLAGS, &network);
911
if(ret == -1){
912
perror("ioctl SIOCSIFFLAGS");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
close(sd);
918
}
919
920
uid = getuid();
921
gid = getgid();
922
923
ret = setuid(uid);
924
if (ret == -1){
925
perror("setuid");
926
}
927
928
setgid(gid);
929
if (ret == -1){
930
perror("setgid");
931
}
932
1122
} else if(network.ifr_flags & IFF_RUNNING){
1123
break;
1124
}
1125
struct timespec sleeptime = { .tv_nsec = 250000000 };
1126
ret = nanosleep(&sleeptime, NULL);
1127
if(ret == -1 and errno != EINTR){
1128
perror("nanosleep");
1129
}
1130
}
1131
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1132
if(ret == -1){
1133
perror("close");
1134
}
1135
#ifdef __linux__
1136
if(restore_loglevel){
1137
/* Restores kernel loglevel to default */
1138
ret = klogctl(7, NULL, 0);
1139
if(ret == -1){
1140
perror("klogctl");
1141
}
1142
}
1143
#endif /* __linux__ */
1144
}
1145
1146
uid = getuid();
1147
gid = getgid();
1148
1149
errno = 0;
1150
setgid(gid);
1151
if(ret == -1){
1152
perror("setgid");
1153
}
1154
1155
ret = setuid(uid);
1156
if(ret == -1){
1157
perror("setuid");
1158
}
1159
1160
ret = init_gnutls_global(pubkey, seckey);
1161
if(ret == -1){
1162
fprintf(stderr, "init_gnutls_global failed\n");
1163
exitcode = EXIT_FAILURE;
1164
goto end;
1165
} else {
1166
gnutls_initialized = true;
1167
}
1168
1169
if(mkdtemp(tempdir) == NULL){
1170
perror("mkdtemp");
1171
goto end;
1172
}
1173
tempdir_created = true;
1174
1175
if(not init_gpgme(pubkey, seckey, tempdir)){
1176
fprintf(stderr, "init_gpgme failed\n");
1177
exitcode = EXIT_FAILURE;
1178
goto end;
1179
} else {
1180
gpgme_initialized = true;
1181
}
1182
1183
if(interface[0] != '\0'){
933
1184
if_index = (AvahiIfIndex) if_nametoindex(interface);
934
1185
if(if_index == 0){
935
1186
fprintf(stderr, "No such interface: \"%s\"\n", interface);
936
exit(EXIT_FAILURE);
937
}
938
939
if(connect_to != NULL){
940
/* Connect directly, do not use Zeroconf */
941
/* (Mainly meant for debugging) */
942
char *address = strrchr(connect_to, ':');
943
if(address == NULL){
944
fprintf(stderr, "No colon in address\n");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
errno = 0;
949
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
950
if(errno){
951
perror("Bad port number");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
*address = '\0';
956
address = connect_to;
957
ret = start_mandos_communication(address, port, if_index, &mc);
958
if(ret < 0){
959
exitcode = EXIT_FAILURE;
960
} else {
961
exitcode = EXIT_SUCCESS;
962
}
963
goto end;
964
}
965
966
if (not debug){
967
avahi_set_log_function(empty_log);
968
}
969
970
/* Initialize the pseudo-RNG for Avahi */
971
srand((unsigned int) time(NULL));
972
973
/* Allocate main Avahi loop object */
974
mc.simple_poll = avahi_simple_poll_new();
975
if (mc.simple_poll == NULL) {
976
fprintf(stderr, "Avahi: Failed to create simple poll"
977
" object.\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
}
981
982
{
983
AvahiServerConfig config;
984
/* Do not publish any local Zeroconf records */
985
avahi_server_config_init(&config);
986
config.publish_hinfo = 0;
987
config.publish_addresses = 0;
988
config.publish_workstation = 0;
989
config.publish_domain = 0;
990
991
/* Allocate a new server */
992
mc.server = avahi_server_new(avahi_simple_poll_get
993
(mc.simple_poll), &config, NULL,
994
NULL, &error);
995
996
/* Free the Avahi configuration data */
997
avahi_server_config_free(&config);
998
}
999
1000
/* Check if creating the Avahi server object succeeded */
1001
if (mc.server == NULL) {
1002
fprintf(stderr, "Failed to create Avahi server: %s\n",
1003
avahi_strerror(error));
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
1008
/* Create the Avahi service browser */
1009
sb = avahi_s_service_browser_new(mc.server, if_index,
1010
AVAHI_PROTO_INET6,
1011
"_mandos._tcp", NULL, 0,
1012
browse_callback, &mc);
1013
if (sb == NULL) {
1014
fprintf(stderr, "Failed to create service browser: %s\n",
1015
avahi_strerror(avahi_server_errno(mc.server)));
1016
exitcode = EXIT_FAILURE;
1017
goto end;
1018
}
1019
1020
/* Run the main loop */
1021
1022
if (debug){
1023
fprintf(stderr, "Starting Avahi loop search\n");
1024
}
1025
1026
avahi_simple_poll_loop(mc.simple_poll);
1027
1187
exitcode = EXIT_FAILURE;
1188
goto end;
1189
}
1190
}
1191
1192
if(connect_to != NULL){
1193
/* Connect directly, do not use Zeroconf */
1194
/* (Mainly meant for debugging) */
1195
char *address = strrchr(connect_to, ':');
1196
if(address == NULL){
1197
fprintf(stderr, "No colon in address\n");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
uint16_t port;
1202
errno = 0;
1203
tmpmax = strtoimax(address+1, &tmp, 10);
1204
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1205
or tmpmax != (uint16_t)tmpmax){
1206
fprintf(stderr, "Bad port number\n");
1207
exitcode = EXIT_FAILURE;
1208
goto end;
1209
}
1210
port = (uint16_t)tmpmax;
1211
*address = '\0';
1212
address = connect_to;
1213
/* Colon in address indicates IPv6 */
1214
int af;
1215
if(strchr(address, ':') != NULL){
1216
af = AF_INET6;
1217
} else {
1218
af = AF_INET;
1219
}
1220
ret = start_mandos_communication(address, port, if_index, af);
1221
if(ret < 0){
1222
exitcode = EXIT_FAILURE;
1223
} else {
1224
exitcode = EXIT_SUCCESS;
1225
}
1226
goto end;
1227
}
1228
1229
{
1230
AvahiServerConfig config;
1231
/* Do not publish any local Zeroconf records */
1232
avahi_server_config_init(&config);
1233
config.publish_hinfo = 0;
1234
config.publish_addresses = 0;
1235
config.publish_workstation = 0;
1236
config.publish_domain = 0;
1237
1238
/* Allocate a new server */
1239
mc.server = avahi_server_new(avahi_simple_poll_get
1240
(mc.simple_poll), &config, NULL,
1241
NULL, &error);
1242
1243
/* Free the Avahi configuration data */
1244
avahi_server_config_free(&config);
1245
}
1246
1247
/* Check if creating the Avahi server object succeeded */
1248
if(mc.server == NULL){
1249
fprintf(stderr, "Failed to create Avahi server: %s\n",
1250
avahi_strerror(error));
1251
exitcode = EXIT_FAILURE;
1252
goto end;
1253
}
1254
1255
/* Create the Avahi service browser */
1256
sb = avahi_s_service_browser_new(mc.server, if_index,
1257
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1258
NULL, 0, browse_callback, NULL);
1259
if(sb == NULL){
1260
fprintf(stderr, "Failed to create service browser: %s\n",
1261
avahi_strerror(avahi_server_errno(mc.server)));
1262
exitcode = EXIT_FAILURE;
1263
goto end;
1264
}
1265
1266
/* Run the main loop */
1267
1268
if(debug){
1269
fprintf(stderr, "Starting Avahi loop search\n");
1270
}
1271
1272
avahi_simple_poll_loop(mc.simple_poll);
1273
1028
1274
end:
1029
1030
if (debug){
1031
fprintf(stderr, "%s exiting\n", argv[0]);
1032
}
1033
1034
/* Cleanup things */
1035
if (sb != NULL)
1036
avahi_s_service_browser_free(sb);
1037
1038
if (mc.server != NULL)
1039
avahi_server_free(mc.server);
1040
1041
if (mc.simple_poll != NULL)
1042
avahi_simple_poll_free(mc.simple_poll);
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1045
1046
if (gnutls_initalized){
1047
gnutls_certificate_free_credentials(mc.cred);
1048
gnutls_global_deinit ();
1049
}
1050
1051
return exitcode;
1275
1276
if(debug){
1277
fprintf(stderr, "%s exiting\n", argv[0]);
1278
}
1279
1280
/* Cleanup things */
1281
if(sb != NULL)
1282
avahi_s_service_browser_free(sb);
1283
1284
if(mc.server != NULL)
1285
avahi_server_free(mc.server);
1286
1287
if(mc.simple_poll != NULL)
1288
avahi_simple_poll_free(mc.simple_poll);
1289
1290
if(gnutls_initialized){
1291
gnutls_certificate_free_credentials(mc.cred);
1292
gnutls_global_deinit();
1293
gnutls_dh_params_deinit(mc.dh_params);
1294
}
1295
1296
if(gpgme_initialized){
1297
gpgme_release(mc.ctx);
1298
}
1299
1300
/* Removes the temp directory used by GPGME */
1301
if(tempdir_created){
1302
DIR *d;
1303
struct dirent *direntry;
1304
d = opendir(tempdir);
1305
if(d == NULL){
1306
if(errno != ENOENT){
1307
perror("opendir");
1308
}
1309
} else {
1310
while(true){
1311
direntry = readdir(d);
1312
if(direntry == NULL){
1313
break;
1314
}
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
continue;
1321
}
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", tempdir,
1324
direntry->d_name);
1325
if(ret < 0){
1326
perror("asprintf");
1327
continue;
1328
}
1329
ret = remove(fullname);
1330
if(ret == -1){
1331
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1332
strerror(errno));
1333
}
1334
free(fullname);
1335
}
1336
closedir(d);
1337
}
1338
ret = rmdir(tempdir);
1339
if(ret == -1 and errno != ENOENT){
1340
perror("rmdir");
1341
}
1342
}
1343
1344
return exitcode;
1052
1345
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0