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237.2.71
(compared to revision 24.1.59)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-09 19:26:19 UTC
- mto: (24.1.136 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090209192619-7rse82x9pypq4ihk
* plugin-runner.c: Comment change.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
- 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
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(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
81
82
#ifdef __linux__
83
#include <sys/klog.h> /* klogctl() */
84
#endif /* __linux__ */
71
85
72
86
/* Avahi */
73
87
/* All Avahi types, constants and functions
86
100
gnutls_*
87
101
init_gnutls_session(),
88
102
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
103
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
90
105
GNUTLS_OPENPGP_FMT_BASE64 */
91
106
92
107
/* GPGME */
98
113
99
114
#define BUFFER_SIZE 256
100
115
116
#define PATHDIR "/conf/conf.d/mandos"
117
#define SECKEY "seckey.txt"
118
#define PUBKEY "pubkey.txt"
119
101
120
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
121
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
122
const char *argp_program_version = "mandos-client " VERSION;
105
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
124
107
125
/* Used for passing in values through the Avahi callback functions */
112
130
unsigned int dh_bits;
113
131
gnutls_dh_params_t dh_params;
114
132
const char *priority;
133
gpgme_ctx_t ctx;
115
134
} mandos_context;
116
135
136
/* global context so signal handler can reach it*/
137
mandos_context mc;
138
117
139
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
140
* Make additional room in "buffer" for at least BUFFER_SIZE more
141
* bytes. "buffer_capacity" is how much is currently allocated,
120
142
* "buffer_length" is how much is already used.
121
143
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
144
size_t incbuffer(char **buffer, size_t buffer_length,
123
145
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
146
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
147
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
148
if(buffer == NULL){
127
149
return 0;
128
150
}
129
151
buffer_capacity += BUFFER_SIZE;
132
154
}
133
155
134
156
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
157
* Initialize GPGME.
137
158
*/
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;
159
static bool init_gpgme(const char *seckey,
160
const char *pubkey, const char *tempdir){
161
int ret;
144
162
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
163
gpgme_engine_info_t engine_info;
149
164
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
165
166
/*
167
* Helper function to insert pub and seckey to the engine keyring.
168
*/
169
bool import_key(const char *filename){
170
int fd;
171
gpgme_data_t pgp_data;
172
173
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
174
if(fd == -1){
175
perror("open");
176
return false;
177
}
178
179
rc = gpgme_data_new_from_fd(&pgp_data, fd);
180
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
183
return false;
184
}
185
186
rc = gpgme_op_import(mc.ctx, pgp_data);
187
if(rc != GPG_ERR_NO_ERROR){
188
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
189
gpgme_strsource(rc), gpgme_strerror(rc));
190
return false;
191
}
192
193
ret = (int)TEMP_FAILURE_RETRY(close(fd));
194
if(ret == -1){
195
perror("close");
196
}
197
gpgme_data_release(pgp_data);
198
return true;
199
}
200
201
if(debug){
202
fprintf(stderr, "Initializing GPGME\n");
152
203
}
153
204
154
205
/* Init GPGME */
155
206
gpgme_check_version(NULL);
156
207
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
208
if(rc != GPG_ERR_NO_ERROR){
158
209
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
210
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
211
return false;
161
212
}
162
213
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){
214
/* Set GPGME home directory for the OpenPGP engine only */
215
rc = gpgme_get_engine_info(&engine_info);
216
if(rc != GPG_ERR_NO_ERROR){
166
217
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
218
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
219
return false;
169
220
}
170
221
while(engine_info != NULL){
171
222
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
223
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
224
engine_info->file_name, tempdir);
174
225
break;
175
226
}
176
227
engine_info = engine_info->next;
177
228
}
178
229
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
230
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
231
return false;
232
}
233
234
/* Create new GPGME "context" */
235
rc = gpgme_new(&(mc.ctx));
236
if(rc != GPG_ERR_NO_ERROR){
237
fprintf(stderr, "bad gpgme_new: %s: %s\n",
238
gpgme_strsource(rc), gpgme_strerror(rc));
239
return false;
240
}
241
242
if(not import_key(pubkey) or not import_key(seckey)){
243
return false;
244
}
245
246
return true;
247
}
248
249
/*
250
* Decrypt OpenPGP data.
251
* Returns -1 on error
252
*/
253
static ssize_t pgp_packet_decrypt(const char *cryptotext,
254
size_t crypto_size,
255
char **plaintext){
256
gpgme_data_t dh_crypto, dh_plain;
257
gpgme_error_t rc;
258
ssize_t ret;
259
size_t plaintext_capacity = 0;
260
ssize_t plaintext_length = 0;
261
262
if(debug){
263
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
264
}
182
265
183
266
/* Create new GPGME data buffer from memory cryptotext */
184
267
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
268
0);
186
if (rc != GPG_ERR_NO_ERROR){
269
if(rc != GPG_ERR_NO_ERROR){
187
270
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
271
gpgme_strsource(rc), gpgme_strerror(rc));
189
272
return -1;
191
274
192
275
/* Create new empty GPGME data buffer for the plaintext */
193
276
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
277
if(rc != GPG_ERR_NO_ERROR){
195
278
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
279
gpgme_strsource(rc), gpgme_strerror(rc));
197
280
gpgme_data_release(dh_crypto);
198
281
return -1;
199
282
}
200
283
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
284
/* Decrypt data from the cryptotext data buffer to the plaintext
211
285
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
286
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
287
if(rc != GPG_ERR_NO_ERROR){
214
288
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
289
gpgme_strsource(rc), gpgme_strerror(rc));
216
290
plaintext_length = -1;
291
if(debug){
292
gpgme_decrypt_result_t result;
293
result = gpgme_op_decrypt_result(mc.ctx);
294
if(result == NULL){
295
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
296
} else {
297
fprintf(stderr, "Unsupported algorithm: %s\n",
298
result->unsupported_algorithm);
299
fprintf(stderr, "Wrong key usage: %u\n",
300
result->wrong_key_usage);
301
if(result->file_name != NULL){
302
fprintf(stderr, "File name: %s\n", result->file_name);
303
}
304
gpgme_recipient_t recipient;
305
recipient = result->recipients;
306
if(recipient){
307
while(recipient != NULL){
308
fprintf(stderr, "Public key algorithm: %s\n",
309
gpgme_pubkey_algo_name(recipient->pubkey_algo));
310
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
311
fprintf(stderr, "Secret key available: %s\n",
312
recipient->status == GPG_ERR_NO_SECKEY
313
? "No" : "Yes");
314
recipient = recipient->next;
315
}
316
}
317
}
318
}
217
319
goto decrypt_end;
218
320
}
219
321
221
323
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
324
}
223
325
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
326
/* 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");
327
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
328
perror("gpgme_data_seek");
256
329
plaintext_length = -1;
257
330
goto decrypt_end;
258
331
}
259
332
260
333
*plaintext = NULL;
261
334
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
335
plaintext_capacity = incbuffer(plaintext,
263
336
(size_t)plaintext_length,
264
337
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
338
if(plaintext_capacity == 0){
339
perror("incbuffer");
267
340
plaintext_length = -1;
268
341
goto decrypt_end;
269
342
}
271
344
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
345
BUFFER_SIZE);
273
346
/* Print the data, if any */
274
if (ret == 0){
347
if(ret == 0){
275
348
/* EOF */
276
349
break;
277
350
}
282
355
}
283
356
plaintext_length += ret;
284
357
}
285
358
286
359
if(debug){
287
360
fprintf(stderr, "Decrypted password is: ");
288
361
for(ssize_t i = 0; i < plaintext_length; i++){
301
374
return plaintext_length;
302
375
}
303
376
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
377
static const char * safer_gnutls_strerror(int value){
378
const char *ret = gnutls_strerror(value); /* Spurious warning from
379
-Wunreachable-code */
380
if(ret == NULL)
307
381
ret = "(unknown)";
308
382
return ret;
309
383
}
314
388
fprintf(stderr, "GnuTLS: %s", string);
315
389
}
316
390
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
391
static int init_gnutls_global(const char *pubkeyfilename,
319
392
const char *seckeyfilename){
320
393
int ret;
321
394
324
397
}
325
398
326
399
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
400
if(ret != GNUTLS_E_SUCCESS){
401
fprintf(stderr, "GnuTLS global_init: %s\n",
402
safer_gnutls_strerror(ret));
330
403
return -1;
331
404
}
332
405
333
if (debug){
406
if(debug){
334
407
/* "Use a log level over 10 to enable all debugging options."
335
408
* - GnuTLS manual
336
409
*/
339
412
}
340
413
341
414
/* 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 ();
415
gnutls_certificate_allocate_credentials(&mc.cred);
416
if(ret != GNUTLS_E_SUCCESS){
417
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
418
from
419
-Wunreachable-code
420
*/
421
safer_gnutls_strerror(ret));
422
gnutls_global_deinit();
348
423
return -1;
349
424
}
350
425
351
426
if(debug){
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
427
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
428
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
354
429
seckeyfilename);
355
430
}
356
431
357
432
ret = gnutls_certificate_set_openpgp_key_file
358
(mc->cred, pubkeyfilename, seckeyfilename,
433
(mc.cred, pubkeyfilename, seckeyfilename,
359
434
GNUTLS_OPENPGP_FMT_BASE64);
360
if (ret != GNUTLS_E_SUCCESS) {
435
if(ret != GNUTLS_E_SUCCESS){
361
436
fprintf(stderr,
362
437
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
438
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
439
fprintf(stderr, "The GnuTLS error is: %s\n",
365
440
safer_gnutls_strerror(ret));
366
441
goto globalfail;
367
442
}
368
443
369
444
/* 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
445
ret = gnutls_dh_params_init(&mc.dh_params);
446
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
448
" %s\n", safer_gnutls_strerror(ret));
449
goto globalfail;
450
}
451
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
454
safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
458
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
459
385
460
return 0;
386
461
387
462
globalfail:
388
389
gnutls_certificate_free_credentials(mc->cred);
463
464
gnutls_certificate_free_credentials(mc.cred);
390
465
gnutls_global_deinit();
466
gnutls_dh_params_deinit(mc.dh_params);
391
467
return -1;
392
393
468
}
394
469
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
470
static int init_gnutls_session(gnutls_session_t *session){
397
471
int ret;
398
472
/* GnuTLS session creation */
399
473
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
474
if(ret != GNUTLS_E_SUCCESS){
401
475
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
402
476
safer_gnutls_strerror(ret));
403
477
}
404
478
405
479
{
406
480
const char *err;
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
481
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
482
if(ret != GNUTLS_E_SUCCESS){
409
483
fprintf(stderr, "Syntax error at: %s\n", err);
410
484
fprintf(stderr, "GnuTLS error: %s\n",
411
485
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
486
gnutls_deinit(*session);
413
487
return -1;
414
488
}
415
489
}
416
490
417
491
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
mc->cred);
419
if (ret != GNUTLS_E_SUCCESS) {
492
mc.cred);
493
if(ret != GNUTLS_E_SUCCESS){
420
494
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
421
495
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
496
gnutls_deinit(*session);
423
497
return -1;
424
498
}
425
499
426
500
/* ignore client certificate if any. */
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
501
gnutls_certificate_server_set_request(*session,
502
GNUTLS_CERT_IGNORE);
429
503
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
504
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
431
505
432
506
return 0;
433
507
}
439
513
/* Called when a Mandos server is found */
440
514
static int start_mandos_communication(const char *ip, uint16_t port,
441
515
AvahiIfIndex if_index,
442
mandos_context *mc){
516
int af){
443
517
int ret, tcp_sd;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
518
ssize_t sret;
519
union {
520
struct sockaddr_in in;
521
struct sockaddr_in6 in6;
522
} to;
445
523
char *buffer = NULL;
446
524
char *decrypted_buffer;
447
525
size_t buffer_length = 0;
449
527
ssize_t decrypted_buffer_size;
450
528
size_t written;
451
529
int retval = 0;
452
char interface[IF_NAMESIZE];
453
530
gnutls_session_t session;
454
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
531
int pf; /* Protocol family */
532
533
switch(af){
534
case AF_INET6:
535
pf = PF_INET6;
536
break;
537
case AF_INET:
538
pf = PF_INET;
539
break;
540
default:
541
fprintf(stderr, "Bad address family: %d\n", af);
542
return -1;
543
}
544
545
ret = init_gnutls_session(&session);
546
if(ret != 0){
457
547
return -1;
458
548
}
459
549
460
550
if(debug){
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
551
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
462
552
"\n", ip, port);
463
553
}
464
554
465
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
466
if(tcp_sd < 0) {
555
tcp_sd = socket(pf, SOCK_STREAM, 0);
556
if(tcp_sd < 0){
467
557
perror("socket");
468
558
return -1;
469
559
}
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
560
479
561
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 ){
562
if(af == AF_INET6){
563
to.in6.sin6_family = (uint16_t)af;
564
ret = inet_pton(af, ip, &to.in6.sin6_addr);
565
} else { /* IPv4 */
566
to.in.sin_family = (sa_family_t)af;
567
ret = inet_pton(af, ip, &to.in.sin_addr);
568
}
569
if(ret < 0 ){
485
570
perror("inet_pton");
486
571
return -1;
487
572
}
489
574
fprintf(stderr, "Bad address: %s\n", ip);
490
575
return -1;
491
576
}
492
to.in6.sin6_port = htons(port); /* Spurious warning */
493
494
to.in6.sin6_scope_id = (uint32_t)if_index;
577
if(af == AF_INET6){
578
to.in6.sin6_port = htons(port); /* Spurious warnings from
579
-Wconversion and
580
-Wunreachable-code */
581
582
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
583
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
584
-Wunreachable-code*/
585
if(if_index == AVAHI_IF_UNSPEC){
586
fprintf(stderr, "An IPv6 link-local address is incomplete"
587
" without a network interface\n");
588
return -1;
589
}
590
/* Set the network interface number as scope */
591
to.in6.sin6_scope_id = (uint32_t)if_index;
592
}
593
} else {
594
to.in.sin_port = htons(port); /* Spurious warnings from
595
-Wconversion and
596
-Wunreachable-code */
597
}
495
598
496
599
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){
600
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
601
char interface[IF_NAMESIZE];
602
if(if_indextoname((unsigned int)if_index, interface) == NULL){
603
perror("if_indextoname");
604
} else {
605
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
606
ip, interface, port);
607
}
608
} else {
609
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
610
port);
611
}
612
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
613
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
614
const char *pcret;
615
if(af == AF_INET6){
616
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
617
sizeof(addrstr));
618
} else {
619
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
620
sizeof(addrstr));
621
}
622
if(pcret == NULL){
502
623
perror("inet_ntop");
503
624
} else {
504
625
if(strcmp(addrstr, ip) != 0){
507
628
}
508
629
}
509
630
510
ret = connect(tcp_sd, &to.in, sizeof(to));
511
if (ret < 0){
631
if(af == AF_INET6){
632
ret = connect(tcp_sd, &to.in6, sizeof(to));
633
} else {
634
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
635
}
636
if(ret < 0){
512
637
perror("connect");
513
638
return -1;
514
639
}
515
640
516
641
const char *out = mandos_protocol_version;
517
642
written = 0;
518
while (true){
643
while(true){
519
644
size_t out_size = strlen(out);
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
645
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
646
out_size - written));
522
if (ret == -1){
647
if(ret == -1){
523
648
perror("write");
524
649
retval = -1;
525
650
goto mandos_end;
528
653
if(written < out_size){
529
654
continue;
530
655
} else {
531
if (out == mandos_protocol_version){
656
if(out == mandos_protocol_version){
532
657
written = 0;
533
658
out = "\r\n";
534
659
} else {
536
661
}
537
662
}
538
663
}
539
664
540
665
if(debug){
541
666
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
667
}
543
668
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
669
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
670
546
671
do{
547
ret = gnutls_handshake (session);
672
ret = gnutls_handshake(session);
548
673
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
549
674
550
if (ret != GNUTLS_E_SUCCESS){
675
if(ret != GNUTLS_E_SUCCESS){
551
676
if(debug){
552
677
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
553
gnutls_perror (ret);
678
gnutls_perror(ret);
554
679
}
555
680
retval = -1;
556
681
goto mandos_end;
559
684
/* Read OpenPGP packet that contains the wanted password */
560
685
561
686
if(debug){
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
687
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
563
688
ip);
564
689
}
565
690
566
691
while(true){
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
692
buffer_capacity = incbuffer(&buffer, buffer_length,
568
693
buffer_capacity);
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
694
if(buffer_capacity == 0){
695
perror("incbuffer");
571
696
retval = -1;
572
697
goto mandos_end;
573
698
}
574
699
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
577
if (ret == 0){
700
sret = gnutls_record_recv(session, buffer+buffer_length,
701
BUFFER_SIZE);
702
if(sret == 0){
578
703
break;
579
704
}
580
if (ret < 0){
581
switch(ret){
705
if(sret < 0){
706
switch(sret){
582
707
case GNUTLS_E_INTERRUPTED:
583
708
case GNUTLS_E_AGAIN:
584
709
break;
585
710
case GNUTLS_E_REHANDSHAKE:
586
711
do{
587
ret = gnutls_handshake (session);
712
ret = gnutls_handshake(session);
588
713
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
589
if (ret < 0){
714
if(ret < 0){
590
715
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
591
gnutls_perror (ret);
716
gnutls_perror(ret);
592
717
retval = -1;
593
718
goto mandos_end;
594
719
}
597
722
fprintf(stderr, "Unknown error while reading data from"
598
723
" encrypted session with Mandos server\n");
599
724
retval = -1;
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
725
gnutls_bye(session, GNUTLS_SHUT_RDWR);
601
726
goto mandos_end;
602
727
}
603
728
} else {
604
buffer_length += (size_t) ret;
729
buffer_length += (size_t) sret;
605
730
}
606
731
}
607
732
609
734
fprintf(stderr, "Closing TLS session\n");
610
735
}
611
736
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
737
gnutls_bye(session, GNUTLS_SHUT_RDWR);
613
738
614
if (buffer_length > 0){
739
if(buffer_length > 0){
615
740
decrypted_buffer_size = pgp_packet_decrypt(buffer,
616
741
buffer_length,
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
742
&decrypted_buffer);
743
if(decrypted_buffer_size >= 0){
620
744
written = 0;
621
745
while(written < (size_t) decrypted_buffer_size){
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
746
ret = (int)fwrite(decrypted_buffer + written, 1,
747
(size_t)decrypted_buffer_size - written,
748
stdout);
625
749
if(ret == 0 and ferror(stdout)){
626
750
if(debug){
627
751
fprintf(stderr, "Error writing encrypted data: %s\n",
636
760
} else {
637
761
retval = -1;
638
762
}
763
} else {
764
retval = -1;
639
765
}
640
766
641
767
/* Shutdown procedure */
642
768
643
769
mandos_end:
644
770
free(buffer);
645
close(tcp_sd);
646
gnutls_deinit (session);
771
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
772
if(ret == -1){
773
perror("close");
774
}
775
gnutls_deinit(session);
647
776
return retval;
648
777
}
649
778
650
779
static void resolve_callback(AvahiSServiceResolver *r,
651
780
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
781
AvahiProtocol proto,
653
782
AvahiResolverEvent event,
654
783
const char *name,
655
784
const char *type,
660
789
AVAHI_GCC_UNUSED AvahiStringList *txt,
661
790
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
791
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
792
AVAHI_GCC_UNUSED void* userdata){
665
793
assert(r);
666
794
667
795
/* Called whenever a service has been resolved successfully or
668
796
timed out */
669
797
670
switch (event) {
798
switch(event){
671
799
default:
672
800
case AVAHI_RESOLVER_FAILURE:
673
801
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
802
" of type '%s' in domain '%s': %s\n", name, type, domain,
675
avahi_strerror(avahi_server_errno(mc->server)));
803
avahi_strerror(avahi_server_errno(mc.server)));
676
804
break;
677
805
678
806
case AVAHI_RESOLVER_FOUND:
681
809
avahi_address_snprint(ip, sizeof(ip), address);
682
810
if(debug){
683
811
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
812
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
813
ip, (intmax_t)interface, port);
686
814
}
687
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
815
int ret = start_mandos_communication(ip, port, interface,
816
avahi_proto_to_af(proto));
817
if(ret == 0){
818
avahi_simple_poll_quit(mc.simple_poll);
690
819
}
691
820
}
692
821
}
693
822
avahi_s_service_resolver_free(r);
694
823
}
695
824
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;
825
static void browse_callback(AvahiSServiceBrowser *b,
826
AvahiIfIndex interface,
827
AvahiProtocol protocol,
828
AvahiBrowserEvent event,
829
const char *name,
830
const char *type,
831
const char *domain,
832
AVAHI_GCC_UNUSED AvahiLookupResultFlags
833
flags,
834
AVAHI_GCC_UNUSED void* userdata){
707
835
assert(b);
708
836
709
837
/* Called whenever a new services becomes available on the LAN or
710
838
is removed from the LAN */
711
839
712
switch (event) {
840
switch(event){
713
841
default:
714
842
case AVAHI_BROWSER_FAILURE:
715
843
716
844
fprintf(stderr, "(Avahi browser) %s\n",
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
845
avahi_strerror(avahi_server_errno(mc.server)));
846
avahi_simple_poll_quit(mc.simple_poll);
719
847
return;
720
848
721
849
case AVAHI_BROWSER_NEW:
724
852
the callback function is called the Avahi server will free the
725
853
resolver for us. */
726
854
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
855
if(!(avahi_s_service_resolver_new(mc.server, interface,
728
856
protocol, name, type, domain,
729
857
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
858
resolve_callback, NULL)))
731
859
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
860
name, avahi_strerror(avahi_server_errno(mc.server)));
733
861
break;
734
862
735
863
case AVAHI_BROWSER_REMOVE:
744
872
}
745
873
}
746
874
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){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
875
sig_atomic_t quit_now = 0;
876
877
static void handle_sigterm(__attribute__((unused)) int sig){
878
if(quit_now){
879
return;
880
}
881
quit_now = 1;
882
int old_errno = errno;
883
if(mc.simple_poll != NULL){
884
avahi_simple_poll_quit(mc.simple_poll);
885
}
886
errno = old_errno;
756
887
}
757
888
758
759
889
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
};
890
AvahiSServiceBrowser *sb = NULL;
891
int error;
892
int ret;
893
intmax_t tmpmax;
894
int numchars;
895
int exitcode = EXIT_SUCCESS;
896
const char *interface = "eth0";
897
struct ifreq network;
898
int sd;
899
uid_t uid;
900
gid_t gid;
901
char *connect_to = NULL;
902
char tempdir[] = "/tmp/mandosXXXXXX";
903
bool tempdir_created = false;
904
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
905
const char *seckey = PATHDIR "/" SECKEY;
906
const char *pubkey = PATHDIR "/" PUBKEY;
907
908
/* Initialize Mandos context */
909
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
910
.dh_bits = 1024, .priority = "SECURE256"
911
":!CTYPE-X.509:+CTYPE-OPENPGP" };
912
bool gnutls_initialized = false;
913
bool gpgme_initialized = false;
914
double delay = 2.5;
812
915
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);
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
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
976
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
977
or arg[numchars] != '\0'){
978
fprintf(stderr, "Bad number of DH bits\n");
979
exit(EXIT_FAILURE);
980
}
981
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
982
break;
983
case 130: /* --priority */
984
mc.priority = arg;
985
break;
986
case 131: /* --delay */
987
ret = sscanf(arg, "%lf%n", &delay, &numchars);
988
if(ret < 1 or arg[numchars] != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
991
}
992
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
996
break;
997
default:
998
return ARGP_ERR_UNKNOWN;
999
}
1000
return 0;
1001
}
1002
1003
struct argp argp = { .options = options, .parser = parse_opt,
1004
.args_doc = "",
1005
.doc = "Mandos client -- Get and decrypt"
1006
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1012
}
1013
}
1014
1015
/* If the interface is down, bring it up */
1016
if(interface[0] != '\0'){
1017
#ifdef __linux__
1018
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1019
messages to mess up the prompt */
1020
ret = klogctl(8, NULL, 5);
1021
bool restore_loglevel = true;
1022
if(ret == -1){
1023
restore_loglevel = false;
1024
perror("klogctl");
1025
}
1026
#endif /* __linux__ */
1027
1028
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1029
if(sd < 0){
1030
perror("socket");
1031
exitcode = EXIT_FAILURE;
1032
#ifdef __linux__
1033
if(restore_loglevel){
1034
ret = klogctl(7, NULL, 0);
1035
if(ret == -1){
1036
perror("klogctl");
1037
}
1038
}
1039
#endif /* __linux__ */
1040
goto end;
1041
}
1042
strcpy(network.ifr_name, interface);
1043
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1044
if(ret == -1){
1045
perror("ioctl SIOCGIFFLAGS");
1046
#ifdef __linux__
1047
if(restore_loglevel){
1048
ret = klogctl(7, NULL, 0);
1049
if(ret == -1){
1050
perror("klogctl");
1051
}
1052
}
1053
#endif /* __linux__ */
1054
exitcode = EXIT_FAILURE;
1055
goto end;
1056
}
1057
if((network.ifr_flags & IFF_UP) == 0){
1058
network.ifr_flags |= IFF_UP;
1059
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1060
if(ret == -1){
1061
perror("ioctl SIOCSIFFLAGS");
1062
exitcode = EXIT_FAILURE;
1063
#ifdef __linux__
1064
if(restore_loglevel){
1065
ret = klogctl(7, NULL, 0);
1066
if(ret == -1){
1067
perror("klogctl");
843
1068
}
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
1069
}
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);
1070
#endif /* __linux__ */
1071
goto end;
1072
}
1073
}
1074
/* sleep checking until interface is running */
1075
for(int i=0; i < delay * 4; i++){
902
1076
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
1077
if(ret == -1){
904
1078
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
1079
} else if(network.ifr_flags & IFF_RUNNING){
1080
break;
1081
}
1082
struct timespec sleeptime = { .tv_nsec = 250000000 };
1083
ret = nanosleep(&sleeptime, NULL);
1084
if(ret == -1 and errno != EINTR){
1085
perror("nanosleep");
1086
}
1087
}
1088
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1089
if(ret == -1){
1090
perror("close");
1091
}
1092
#ifdef __linux__
1093
if(restore_loglevel){
1094
/* Restores kernel loglevel to default */
1095
ret = klogctl(7, NULL, 0);
1096
if(ret == -1){
1097
perror("klogctl");
1098
}
1099
}
1100
#endif /* __linux__ */
1101
}
1102
1103
uid = getuid();
1104
gid = getgid();
1105
1106
errno = 0;
1107
setgid(gid);
1108
if(ret == -1){
1109
perror("setgid");
1110
}
1111
1112
ret = setuid(uid);
1113
if(ret == -1){
1114
perror("setuid");
1115
}
1116
1117
ret = init_gnutls_global(pubkey, seckey);
1118
if(ret == -1){
1119
fprintf(stderr, "init_gnutls_global failed\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
} else {
1123
gnutls_initialized = true;
1124
}
1125
1126
if(mkdtemp(tempdir) == NULL){
1127
perror("mkdtemp");
1128
goto end;
1129
}
1130
tempdir_created = true;
1131
1132
if(not init_gpgme(pubkey, seckey, tempdir)){
1133
fprintf(stderr, "init_gpgme failed\n");
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
} else {
1137
gpgme_initialized = true;
1138
}
1139
1140
if(interface[0] != '\0'){
933
1141
if_index = (AvahiIfIndex) if_nametoindex(interface);
934
1142
if(if_index == 0){
935
1143
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
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
}
1148
1149
if(connect_to != NULL){
1150
/* Connect directly, do not use Zeroconf */
1151
/* (Mainly meant for debugging) */
1152
char *address = strrchr(connect_to, ':');
1153
if(address == NULL){
1154
fprintf(stderr, "No colon in address\n");
1155
exitcode = EXIT_FAILURE;
1156
goto end;
1157
}
1158
uint16_t port;
1159
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1160
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1161
or address[numchars+1] != '\0'){
1162
fprintf(stderr, "Bad port number\n");
1163
exitcode = EXIT_FAILURE;
1164
goto end;
1165
}
1166
port = (uint16_t)tmpmax;
1167
*address = '\0';
1168
address = connect_to;
1169
/* Colon in address indicates IPv6 */
1170
int af;
1171
if(strchr(address, ':') != NULL){
1172
af = AF_INET6;
1173
} else {
1174
af = AF_INET;
1175
}
1176
ret = start_mandos_communication(address, port, if_index, af);
1177
if(ret < 0){
1178
exitcode = EXIT_FAILURE;
1179
} else {
1180
exitcode = EXIT_SUCCESS;
1181
}
1182
goto end;
1183
}
1184
1185
if(not debug){
1186
avahi_set_log_function(empty_log);
1187
}
1188
1189
/* Initialize the pseudo-RNG for Avahi */
1190
srand((unsigned int) time(NULL));
1191
1192
/* Allocate main Avahi loop object */
1193
mc.simple_poll = avahi_simple_poll_new();
1194
if(mc.simple_poll == NULL){
1195
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
1200
{
1201
AvahiServerConfig config;
1202
/* Do not publish any local Zeroconf records */
1203
avahi_server_config_init(&config);
1204
config.publish_hinfo = 0;
1205
config.publish_addresses = 0;
1206
config.publish_workstation = 0;
1207
config.publish_domain = 0;
1208
1209
/* Allocate a new server */
1210
mc.server = avahi_server_new(avahi_simple_poll_get
1211
(mc.simple_poll), &config, NULL,
1212
NULL, &error);
1213
1214
/* Free the Avahi configuration data */
1215
avahi_server_config_free(&config);
1216
}
1217
1218
/* Check if creating the Avahi server object succeeded */
1219
if(mc.server == NULL){
1220
fprintf(stderr, "Failed to create Avahi server: %s\n",
1221
avahi_strerror(error));
1222
exitcode = EXIT_FAILURE;
1223
goto end;
1224
}
1225
1226
/* Create the Avahi service browser */
1227
sb = avahi_s_service_browser_new(mc.server, if_index,
1228
AVAHI_PROTO_INET6, "_mandos._tcp",
1229
NULL, 0, browse_callback, NULL);
1230
if(sb == NULL){
1231
fprintf(stderr, "Failed to create service browser: %s\n",
1232
avahi_strerror(avahi_server_errno(mc.server)));
1233
exitcode = EXIT_FAILURE;
1234
goto end;
1235
}
1236
1237
sigemptyset(&sigterm_action.sa_mask);
1238
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1239
if(ret == -1){
1240
perror("sigaddset");
1241
exitcode = EXIT_FAILURE;
1242
goto end;
1243
}
1244
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1245
if(ret == -1){
1246
perror("sigaddset");
1247
exitcode = EXIT_FAILURE;
1248
goto end;
1249
}
1250
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1251
if(ret == -1){
1252
perror("sigaddset");
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1257
if(ret == -1){
1258
perror("sigaction");
1259
exitcode = EXIT_FAILURE;
1260
goto end;
1261
}
1262
1263
/* Run the main loop */
1264
1265
if(debug){
1266
fprintf(stderr, "Starting Avahi loop search\n");
1267
}
1268
1269
avahi_simple_poll_loop(mc.simple_poll);
1270
1028
1271
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;
1272
1273
if(debug){
1274
fprintf(stderr, "%s exiting\n", argv[0]);
1275
}
1276
1277
/* Cleanup things */
1278
if(sb != NULL)
1279
avahi_s_service_browser_free(sb);
1280
1281
if(mc.server != NULL)
1282
avahi_server_free(mc.server);
1283
1284
if(mc.simple_poll != NULL)
1285
avahi_simple_poll_free(mc.simple_poll);
1286
1287
if(gnutls_initialized){
1288
gnutls_certificate_free_credentials(mc.cred);
1289
gnutls_global_deinit();
1290
gnutls_dh_params_deinit(mc.dh_params);
1291
}
1292
1293
if(gpgme_initialized){
1294
gpgme_release(mc.ctx);
1295
}
1296
1297
/* Removes the temp directory used by GPGME */
1298
if(tempdir_created){
1299
DIR *d;
1300
struct dirent *direntry;
1301
d = opendir(tempdir);
1302
if(d == NULL){
1303
if(errno != ENOENT){
1304
perror("opendir");
1305
}
1306
} else {
1307
while(true){
1308
direntry = readdir(d);
1309
if(direntry == NULL){
1310
break;
1311
}
1312
/* Skip "." and ".." */
1313
if(direntry->d_name[0] == '.'
1314
and (direntry->d_name[1] == '\0'
1315
or (direntry->d_name[1] == '.'
1316
and direntry->d_name[2] == '\0'))){
1317
continue;
1318
}
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", tempdir,
1321
direntry->d_name);
1322
if(ret < 0){
1323
perror("asprintf");
1324
continue;
1325
}
1326
ret = remove(fullname);
1327
if(ret == -1){
1328
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1329
strerror(errno));
1330
}
1331
free(fullname);
1332
}
1333
closedir(d);
1334
}
1335
ret = rmdir(tempdir);
1336
if(ret == -1 and errno != ENOENT){
1337
perror("rmdir");
1338
}
1339
}
1340
1341
return exitcode;
1052
1342
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0