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- Committer: Teddy Hogeborn
- Date: 2009-02-13 09:03:22 UTC
- Revision ID: teddy@fukt.bsnet.se-20090213090322-6ixytwlkdsm637d7
Tags: version-1.0.6-1
* Makefile (version): Changed to "1.0.6".
NEWS (Version 1.0.6): New entry.
debian/changelog (1.0.6-1): - '' -
NEWS (Version 1.0.6): New entry.
debian/changelog (1.0.6-1): - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
35
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
stdout, ferror(), remove() */
39
40
#include <stdint.h> /* uint16_t, uint32_t */
40
41
#include <stddef.h> /* NULL, size_t, ssize_t */
41
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
43
srand(), strtof() */
44
#include <stdbool.h> /* bool, false, true */
44
45
#include <string.h> /* memset(), strcmp(), strlen(),
45
46
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
47
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
49
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
50
SOCK_STREAM, uid_t, gid_t, open(),
51
opendir(), DIR */
52
#include <sys/stat.h> /* open() */
52
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
54
inet_pton(), connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir()
57
*/
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
strtoimax() */
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 = { .simple_poll = NULL, .server = NULL,
138
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
140
117
141
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
143
* bytes. "buffer_capacity" is how much is currently allocated,
120
144
* "buffer_length" is how much is already used.
121
145
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
146
size_t incbuffer(char **buffer, size_t buffer_length,
123
147
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
150
if(buffer == NULL){
127
151
return 0;
128
152
}
129
153
buffer_capacity += BUFFER_SIZE;
132
156
}
133
157
134
158
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
159
* Initialize GPGME.
137
160
*/
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;
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
144
164
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
165
gpgme_engine_info_t engine_info;
149
166
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
167
168
/*
169
* Helper function to insert pub and seckey to the engine keyring.
170
*/
171
bool import_key(const char *filename){
172
int fd;
173
gpgme_data_t pgp_data;
174
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
if(fd == -1){
177
perror("open");
178
return false;
179
}
180
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
gpgme_strsource(rc), gpgme_strerror(rc));
185
return false;
186
}
187
188
rc = gpgme_op_import(mc.ctx, pgp_data);
189
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
192
return false;
193
}
194
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
if(ret == -1){
197
perror("close");
198
}
199
gpgme_data_release(pgp_data);
200
return true;
201
}
202
203
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
152
205
}
153
206
154
207
/* Init GPGME */
155
208
gpgme_check_version(NULL);
156
209
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
210
if(rc != GPG_ERR_NO_ERROR){
158
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
212
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
213
return false;
161
214
}
162
215
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){
216
/* Set GPGME home directory for the OpenPGP engine only */
217
rc = gpgme_get_engine_info(&engine_info);
218
if(rc != GPG_ERR_NO_ERROR){
166
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
220
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
221
return false;
169
222
}
170
223
while(engine_info != NULL){
171
224
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
225
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
226
engine_info->file_name, tempdir);
174
227
break;
175
228
}
176
229
engine_info = engine_info->next;
177
230
}
178
231
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
233
return false;
234
}
235
236
/* Create new GPGME "context" */
237
rc = gpgme_new(&(mc.ctx));
238
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
241
return false;
242
}
243
244
if(not import_key(pubkey) or not import_key(seckey)){
245
return false;
246
}
247
248
return true;
249
}
250
251
/*
252
* Decrypt OpenPGP data.
253
* Returns -1 on error
254
*/
255
static ssize_t pgp_packet_decrypt(const char *cryptotext,
256
size_t crypto_size,
257
char **plaintext){
258
gpgme_data_t dh_crypto, dh_plain;
259
gpgme_error_t rc;
260
ssize_t ret;
261
size_t plaintext_capacity = 0;
262
ssize_t plaintext_length = 0;
263
264
if(debug){
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
266
}
182
267
183
268
/* Create new GPGME data buffer from memory cryptotext */
184
269
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
270
0);
186
if (rc != GPG_ERR_NO_ERROR){
271
if(rc != GPG_ERR_NO_ERROR){
187
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
273
gpgme_strsource(rc), gpgme_strerror(rc));
189
274
return -1;
191
276
192
277
/* Create new empty GPGME data buffer for the plaintext */
193
278
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
279
if(rc != GPG_ERR_NO_ERROR){
195
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
281
gpgme_strsource(rc), gpgme_strerror(rc));
197
282
gpgme_data_release(dh_crypto);
198
283
return -1;
199
284
}
200
285
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
286
/* Decrypt data from the cryptotext data buffer to the plaintext
211
287
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
if(rc != GPG_ERR_NO_ERROR){
214
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
291
gpgme_strsource(rc), gpgme_strerror(rc));
216
292
plaintext_length = -1;
293
if(debug){
294
gpgme_decrypt_result_t result;
295
result = gpgme_op_decrypt_result(mc.ctx);
296
if(result == NULL){
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
298
} else {
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
303
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
305
}
306
gpgme_recipient_t recipient;
307
recipient = result->recipients;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
318
}
319
}
320
}
217
321
goto decrypt_end;
218
322
}
219
323
221
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
326
}
223
327
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
328
/* 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");
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
256
331
plaintext_length = -1;
257
332
goto decrypt_end;
258
333
}
259
334
260
335
*plaintext = NULL;
261
336
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
337
plaintext_capacity = incbuffer(plaintext,
263
338
(size_t)plaintext_length,
264
339
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
340
if(plaintext_capacity == 0){
341
perror("incbuffer");
267
342
plaintext_length = -1;
268
343
goto decrypt_end;
269
344
}
271
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
347
BUFFER_SIZE);
273
348
/* Print the data, if any */
274
if (ret == 0){
349
if(ret == 0){
275
350
/* EOF */
276
351
break;
277
352
}
282
357
}
283
358
plaintext_length += ret;
284
359
}
285
360
286
361
if(debug){
287
362
fprintf(stderr, "Decrypted password is: ");
288
363
for(ssize_t i = 0; i < plaintext_length; i++){
301
376
return plaintext_length;
302
377
}
303
378
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
382
if(ret == NULL)
307
383
ret = "(unknown)";
308
384
return ret;
309
385
}
314
390
fprintf(stderr, "GnuTLS: %s", string);
315
391
}
316
392
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
393
static int init_gnutls_global(const char *pubkeyfilename,
319
394
const char *seckeyfilename){
320
395
int ret;
321
396
324
399
}
325
400
326
401
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
402
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
330
405
return -1;
331
406
}
332
407
333
if (debug){
408
if(debug){
334
409
/* "Use a log level over 10 to enable all debugging options."
335
410
* - GnuTLS manual
336
411
*/
339
414
}
340
415
341
416
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
417
gnutls_certificate_allocate_credentials(&mc.cred);
418
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
424
gnutls_global_deinit();
347
425
return -1;
348
426
}
349
427
350
428
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
353
431
seckeyfilename);
354
432
}
355
433
356
434
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
435
(mc.cred, pubkeyfilename, seckeyfilename,
358
436
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
437
if(ret != GNUTLS_E_SUCCESS){
360
438
fprintf(stderr,
361
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
441
fprintf(stderr, "The GnuTLS error is: %s\n",
364
442
safer_gnutls_strerror(ret));
365
443
goto globalfail;
366
444
}
367
445
368
446
/* GnuTLS server initialization */
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
447
ret = gnutls_dh_params_init(&mc.dh_params);
448
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
451
goto globalfail;
452
}
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
457
goto globalfail;
458
}
459
460
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
461
384
462
return 0;
385
463
386
464
globalfail:
387
388
gnutls_certificate_free_credentials(mc->cred);
465
466
gnutls_certificate_free_credentials(mc.cred);
389
467
gnutls_global_deinit();
468
gnutls_dh_params_deinit(mc.dh_params);
390
469
return -1;
391
392
470
}
393
471
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
472
static int init_gnutls_session(gnutls_session_t *session){
396
473
int ret;
397
474
/* GnuTLS session creation */
398
475
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
476
if(ret != GNUTLS_E_SUCCESS){
400
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
478
safer_gnutls_strerror(ret));
402
479
}
403
480
404
481
{
405
482
const char *err;
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
484
if(ret != GNUTLS_E_SUCCESS){
408
485
fprintf(stderr, "Syntax error at: %s\n", err);
409
486
fprintf(stderr, "GnuTLS error: %s\n",
410
487
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
488
gnutls_deinit(*session);
412
489
return -1;
413
490
}
414
491
}
415
492
416
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
494
mc.cred);
495
if(ret != GNUTLS_E_SUCCESS){
419
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
497
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
498
gnutls_deinit(*session);
422
499
return -1;
423
500
}
424
501
425
502
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
428
505
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
430
507
431
508
return 0;
432
509
}
438
515
/* Called when a Mandos server is found */
439
516
static int start_mandos_communication(const char *ip, uint16_t port,
440
517
AvahiIfIndex if_index,
441
mandos_context *mc){
518
int af){
442
519
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
520
ssize_t sret;
521
union {
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
524
} to;
444
525
char *buffer = NULL;
445
526
char *decrypted_buffer;
446
527
size_t buffer_length = 0;
448
529
ssize_t decrypted_buffer_size;
449
530
size_t written;
450
531
int retval = 0;
451
char interface[IF_NAMESIZE];
452
532
gnutls_session_t session;
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
533
int pf; /* Protocol family */
534
535
switch(af){
536
case AF_INET6:
537
pf = PF_INET6;
538
break;
539
case AF_INET:
540
pf = PF_INET;
541
break;
542
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
544
return -1;
545
}
546
547
ret = init_gnutls_session(&session);
548
if(ret != 0){
456
549
return -1;
457
550
}
458
551
459
552
if(debug){
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
461
554
"\n", ip, port);
462
555
}
463
556
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
if(tcp_sd < 0){
466
559
perror("socket");
467
560
return -1;
468
561
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
476
}
477
562
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
563
memset(&to, 0, sizeof(to));
564
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
} else { /* IPv4 */
568
to.in.sin_family = (sa_family_t)af;
569
ret = inet_pton(af, ip, &to.in.sin_addr);
570
}
571
if(ret < 0 ){
484
572
perror("inet_pton");
485
573
return -1;
486
574
}
488
576
fprintf(stderr, "Bad address: %s\n", ip);
489
577
return -1;
490
578
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
492
493
to.in6.sin6_scope_id = (uint32_t)if_index;
579
if(af == AF_INET6){
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
-Wconversion and
582
-Wunreachable-code */
583
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
-Wunreachable-code*/
587
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
591
}
592
/* Set the network interface number as scope */
593
to.in6.sin6_scope_id = (uint32_t)if_index;
594
}
595
} else {
596
to.in.sin_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
599
}
494
600
495
601
if(debug){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
char interface[IF_NAMESIZE];
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
606
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
609
}
610
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
613
}
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
616
const char *pcret;
617
if(af == AF_INET6){
618
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
619
sizeof(addrstr));
620
} else {
621
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
622
sizeof(addrstr));
623
}
624
if(pcret == NULL){
501
625
perror("inet_ntop");
502
626
} else {
503
627
if(strcmp(addrstr, ip) != 0){
506
630
}
507
631
}
508
632
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
633
if(af == AF_INET6){
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
} else {
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
}
638
if(ret < 0){
511
639
perror("connect");
512
640
return -1;
513
641
}
514
642
515
643
const char *out = mandos_protocol_version;
516
644
written = 0;
517
while (true){
645
while(true){
518
646
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
648
out_size - written));
521
if (ret == -1){
649
if(ret == -1){
522
650
perror("write");
523
651
retval = -1;
524
652
goto mandos_end;
527
655
if(written < out_size){
528
656
continue;
529
657
} else {
530
if (out == mandos_protocol_version){
658
if(out == mandos_protocol_version){
531
659
written = 0;
532
660
out = "\r\n";
533
661
} else {
535
663
}
536
664
}
537
665
}
538
666
539
667
if(debug){
540
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
669
}
542
670
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
545
673
do{
546
ret = gnutls_handshake (session);
674
ret = gnutls_handshake(session);
547
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
676
549
if (ret != GNUTLS_E_SUCCESS){
677
if(ret != GNUTLS_E_SUCCESS){
550
678
if(debug){
551
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
680
gnutls_perror(ret);
553
681
}
554
682
retval = -1;
555
683
goto mandos_end;
558
686
/* Read OpenPGP packet that contains the wanted password */
559
687
560
688
if(debug){
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
562
690
ip);
563
691
}
564
692
565
693
while(true){
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
694
buffer_capacity = incbuffer(&buffer, buffer_length,
567
695
buffer_capacity);
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
696
if(buffer_capacity == 0){
697
perror("incbuffer");
570
698
retval = -1;
571
699
goto mandos_end;
572
700
}
573
701
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
702
sret = gnutls_record_recv(session, buffer+buffer_length,
703
BUFFER_SIZE);
704
if(sret == 0){
577
705
break;
578
706
}
579
if (ret < 0){
580
switch(ret){
707
if(sret < 0){
708
switch(sret){
581
709
case GNUTLS_E_INTERRUPTED:
582
710
case GNUTLS_E_AGAIN:
583
711
break;
584
712
case GNUTLS_E_REHANDSHAKE:
585
713
do{
586
ret = gnutls_handshake (session);
714
ret = gnutls_handshake(session);
587
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
if (ret < 0){
716
if(ret < 0){
589
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
718
gnutls_perror(ret);
591
719
retval = -1;
592
720
goto mandos_end;
593
721
}
596
724
fprintf(stderr, "Unknown error while reading data from"
597
725
" encrypted session with Mandos server\n");
598
726
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
600
728
goto mandos_end;
601
729
}
602
730
} else {
603
buffer_length += (size_t) ret;
731
buffer_length += (size_t) sret;
604
732
}
605
733
}
606
734
608
736
fprintf(stderr, "Closing TLS session\n");
609
737
}
610
738
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
612
740
613
if (buffer_length > 0){
741
if(buffer_length > 0){
614
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
743
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
744
&decrypted_buffer);
745
if(decrypted_buffer_size >= 0){
619
746
written = 0;
620
747
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
748
ret = (int)fwrite(decrypted_buffer + written, 1,
749
(size_t)decrypted_buffer_size - written,
750
stdout);
624
751
if(ret == 0 and ferror(stdout)){
625
752
if(debug){
626
753
fprintf(stderr, "Error writing encrypted data: %s\n",
635
762
} else {
636
763
retval = -1;
637
764
}
765
} else {
766
retval = -1;
638
767
}
639
768
640
769
/* Shutdown procedure */
641
770
642
771
mandos_end:
643
772
free(buffer);
644
close(tcp_sd);
645
gnutls_deinit (session);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
776
}
777
gnutls_deinit(session);
646
778
return retval;
647
779
}
648
780
649
781
static void resolve_callback(AvahiSServiceResolver *r,
650
782
AvahiIfIndex interface,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
783
AvahiProtocol proto,
652
784
AvahiResolverEvent event,
653
785
const char *name,
654
786
const char *type,
659
791
AVAHI_GCC_UNUSED AvahiStringList *txt,
660
792
AVAHI_GCC_UNUSED AvahiLookupResultFlags
661
793
flags,
662
void* userdata) {
663
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
794
AVAHI_GCC_UNUSED void* userdata){
795
assert(r);
665
796
666
797
/* Called whenever a service has been resolved successfully or
667
798
timed out */
668
799
669
switch (event) {
800
switch(event){
670
801
default:
671
802
case AVAHI_RESOLVER_FAILURE:
672
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
673
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
674
avahi_strerror(avahi_server_errno(mc->server)));
805
avahi_strerror(avahi_server_errno(mc.server)));
675
806
break;
676
807
677
808
case AVAHI_RESOLVER_FOUND:
680
811
avahi_address_snprint(ip, sizeof(ip), address);
681
812
if(debug){
682
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
685
816
}
686
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
688
avahi_simple_poll_quit(mc->simple_poll);
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
819
if(ret == 0){
820
avahi_simple_poll_quit(mc.simple_poll);
689
821
}
690
822
}
691
823
}
692
824
avahi_s_service_resolver_free(r);
693
825
}
694
826
695
static void browse_callback( AvahiSServiceBrowser *b,
696
AvahiIfIndex interface,
697
AvahiProtocol protocol,
698
AvahiBrowserEvent event,
699
const char *name,
700
const char *type,
701
const char *domain,
702
AVAHI_GCC_UNUSED AvahiLookupResultFlags
703
flags,
704
void* userdata) {
705
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
827
static void browse_callback(AvahiSServiceBrowser *b,
828
AvahiIfIndex interface,
829
AvahiProtocol protocol,
830
AvahiBrowserEvent event,
831
const char *name,
832
const char *type,
833
const char *domain,
834
AVAHI_GCC_UNUSED AvahiLookupResultFlags
835
flags,
836
AVAHI_GCC_UNUSED void* userdata){
837
assert(b);
707
838
708
839
/* Called whenever a new services becomes available on the LAN or
709
840
is removed from the LAN */
710
841
711
switch (event) {
842
switch(event){
712
843
default:
713
844
case AVAHI_BROWSER_FAILURE:
714
845
715
846
fprintf(stderr, "(Avahi browser) %s\n",
716
avahi_strerror(avahi_server_errno(mc->server)));
717
avahi_simple_poll_quit(mc->simple_poll);
847
avahi_strerror(avahi_server_errno(mc.server)));
848
avahi_simple_poll_quit(mc.simple_poll);
718
849
return;
719
850
720
851
case AVAHI_BROWSER_NEW:
723
854
the callback function is called the Avahi server will free the
724
855
resolver for us. */
725
856
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
727
protocol, name, type, domain,
728
AVAHI_PROTO_INET6, 0,
729
resolve_callback, mc)))
857
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
858
name, type, domain, protocol, 0,
859
resolve_callback, NULL) == NULL)
730
860
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
731
name, avahi_strerror(avahi_server_errno(mc->server)));
861
name, avahi_strerror(avahi_server_errno(mc.server)));
732
862
break;
733
863
734
864
case AVAHI_BROWSER_REMOVE:
743
873
}
744
874
}
745
875
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
876
sig_atomic_t quit_now = 0;
877
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
880
if(quit_now){
881
return;
882
}
883
quit_now = 1;
884
int old_errno = errno;
885
if(mc.simple_poll != NULL){
886
avahi_simple_poll_quit(mc.simple_poll);
887
}
888
errno = old_errno;
889
}
890
891
int main(int argc, char *argv[]){
892
AvahiSServiceBrowser *sb = NULL;
893
int error;
894
int ret;
895
intmax_t tmpmax;
749
896
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
755
}
756
757
758
int main(int argc, char *argv[]){
759
AvahiSServiceBrowser *sb = NULL;
760
int error;
761
int ret;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
765
int sd;
766
uid_t uid;
767
gid_t gid;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
777
778
{
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
785
.group = 1 },
786
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
793
.group = 1 },
794
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
797
.group = 1 },
798
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
801
.group = 2 },
802
{ .name = "dh-bits", .key = 129,
803
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
805
.group = 2 },
806
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
809
{ .name = NULL }
810
};
811
812
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
819
debug = true;
820
break;
821
case 'c':
822
connect_to = arg;
823
break;
824
case 'i':
825
interface = arg;
826
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
841
exit(EXIT_FAILURE);
897
int exitcode = EXIT_SUCCESS;
898
const char *interface = "eth0";
899
struct ifreq network;
900
int sd;
901
uid_t uid;
902
gid_t gid;
903
char *connect_to = NULL;
904
char tempdir[] = "/tmp/mandosXXXXXX";
905
bool tempdir_created = false;
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
907
const char *seckey = PATHDIR "/" SECKEY;
908
const char *pubkey = PATHDIR "/" PUBKEY;
909
910
bool gnutls_initialized = false;
911
bool gpgme_initialized = false;
912
float delay = 2.5f;
913
914
struct sigaction old_sigterm_action;
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
916
917
{
918
struct argp_option options[] = {
919
{ .name = "debug", .key = 128,
920
.doc = "Debug mode", .group = 3 },
921
{ .name = "connect", .key = 'c',
922
.arg = "ADDRESS:PORT",
923
.doc = "Connect directly to a specific Mandos server",
924
.group = 1 },
925
{ .name = "interface", .key = 'i',
926
.arg = "NAME",
927
.doc = "Network interface that will be used to search for"
928
" Mandos servers",
929
.group = 1 },
930
{ .name = "seckey", .key = 's',
931
.arg = "FILE",
932
.doc = "OpenPGP secret key file base name",
933
.group = 1 },
934
{ .name = "pubkey", .key = 'p',
935
.arg = "FILE",
936
.doc = "OpenPGP public key file base name",
937
.group = 2 },
938
{ .name = "dh-bits", .key = 129,
939
.arg = "BITS",
940
.doc = "Bit length of the prime number used in the"
941
" Diffie-Hellman key exchange",
942
.group = 2 },
943
{ .name = "priority", .key = 130,
944
.arg = "STRING",
945
.doc = "GnuTLS priority string for the TLS handshake",
946
.group = 1 },
947
{ .name = "delay", .key = 131,
948
.arg = "SECONDS",
949
.doc = "Maximum delay to wait for interface startup",
950
.group = 2 },
951
{ .name = NULL }
952
};
953
954
error_t parse_opt(int key, char *arg,
955
struct argp_state *state){
956
switch(key){
957
case 128: /* --debug */
958
debug = true;
959
break;
960
case 'c': /* --connect */
961
connect_to = arg;
962
break;
963
case 'i': /* --interface */
964
interface = arg;
965
break;
966
case 's': /* --seckey */
967
seckey = arg;
968
break;
969
case 'p': /* --pubkey */
970
pubkey = arg;
971
break;
972
case 129: /* --dh-bits */
973
errno = 0;
974
tmpmax = strtoimax(arg, &tmp, 10);
975
if(errno != 0 or tmp == arg or *tmp != '\0'
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
979
}
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
981
break;
982
case 130: /* --priority */
983
mc.priority = arg;
984
break;
985
case 131: /* --delay */
986
errno = 0;
987
delay = strtof(arg, &tmp);
988
if(errno != 0 or tmp == arg or *tmp != '\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(not debug){
1016
avahi_set_log_function(empty_log);
1017
}
1018
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1020
from the signal handler */
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
mc.simple_poll = avahi_simple_poll_new();
1024
if(mc.simple_poll == NULL){
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
1027
goto end;
1028
}
1029
1030
sigemptyset(&sigterm_action.sa_mask);
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1032
if(ret == -1){
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1035
goto end;
1036
}
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1038
if(ret == -1){
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1041
goto end;
1042
}
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1044
if(ret == -1){
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
1055
1056
/* If the interface is down, bring it up */
1057
if(interface[0] != '\0'){
1058
#ifdef __linux__
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1060
messages to mess up the prompt */
1061
ret = klogctl(8, NULL, 5);
1062
bool restore_loglevel = true;
1063
if(ret == -1){
1064
restore_loglevel = false;
1065
perror("klogctl");
1066
}
1067
#endif /* __linux__ */
1068
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1070
if(sd < 0){
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1073
#ifdef __linux__
1074
if(restore_loglevel){
1075
ret = klogctl(7, NULL, 0);
1076
if(ret == -1){
1077
perror("klogctl");
1078
}
1079
}
1080
#endif /* __linux__ */
1081
goto end;
1082
}
1083
strcpy(network.ifr_name, interface);
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1085
if(ret == -1){
1086
perror("ioctl SIOCGIFFLAGS");
1087
#ifdef __linux__
1088
if(restore_loglevel){
1089
ret = klogctl(7, NULL, 0);
1090
if(ret == -1){
1091
perror("klogctl");
1092
}
1093
}
1094
#endif /* __linux__ */
1095
exitcode = EXIT_FAILURE;
1096
goto end;
1097
}
1098
if((network.ifr_flags & IFF_UP) == 0){
1099
network.ifr_flags |= IFF_UP;
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1101
if(ret == -1){
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1104
#ifdef __linux__
1105
if(restore_loglevel){
1106
ret = klogctl(7, NULL, 0);
1107
if(ret == -1){
1108
perror("klogctl");
842
1109
}
843
break;
844
case 130:
845
mc.priority = arg;
846
break;
847
case ARGP_KEY_ARG:
848
argp_usage (state);
849
case ARGP_KEY_END:
850
break;
851
default:
852
return ARGP_ERR_UNKNOWN;
853
1110
}
854
return 0;
855
}
856
857
struct argp argp = { .options = options, .parser = parse_opt,
858
.args_doc = "",
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
865
goto end;
866
}
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
891
892
/* If the interface is down, bring it up */
893
{
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
895
if(sd < 0) {
896
perror("socket");
897
exitcode = EXIT_FAILURE;
898
goto end;
899
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
1111
#endif /* __linux__ */
1112
goto end;
1113
}
1114
}
1115
/* sleep checking until interface is running */
1116
for(int i=0; i < delay * 4; i++){
901
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
902
1118
if(ret == -1){
903
1119
perror("ioctl SIOCGIFFLAGS");
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
910
if(ret == -1){
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
913
goto end;
914
}
915
}
916
close(sd);
917
}
918
919
uid = getuid();
920
gid = getgid();
921
922
ret = setuid(uid);
923
if (ret == -1){
924
perror("setuid");
925
}
926
927
setgid(gid);
928
if (ret == -1){
929
perror("setgid");
930
}
931
1120
} else if(network.ifr_flags & IFF_RUNNING){
1121
break;
1122
}
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1124
ret = nanosleep(&sleeptime, NULL);
1125
if(ret == -1 and errno != EINTR){
1126
perror("nanosleep");
1127
}
1128
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
1132
}
1133
#ifdef __linux__
1134
if(restore_loglevel){
1135
/* Restores kernel loglevel to default */
1136
ret = klogctl(7, NULL, 0);
1137
if(ret == -1){
1138
perror("klogctl");
1139
}
1140
}
1141
#endif /* __linux__ */
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
1156
}
1157
1158
ret = init_gnutls_global(pubkey, seckey);
1159
if(ret == -1){
1160
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
1162
goto end;
1163
} else {
1164
gnutls_initialized = true;
1165
}
1166
1167
if(mkdtemp(tempdir) == NULL){
1168
perror("mkdtemp");
1169
goto end;
1170
}
1171
tempdir_created = true;
1172
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
1174
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
1176
goto end;
1177
} else {
1178
gpgme_initialized = true;
1179
}
1180
1181
if(interface[0] != '\0'){
932
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
933
1183
if(if_index == 0){
934
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
935
exit(EXIT_FAILURE);
936
}
937
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
942
if(address == NULL){
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
945
goto end;
946
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
952
goto end;
953
}
954
*address = '\0';
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
957
if(ret < 0){
958
exitcode = EXIT_FAILURE;
959
} else {
960
exitcode = EXIT_SUCCESS;
961
}
962
goto end;
963
}
964
965
if (not debug){
966
avahi_set_log_function(empty_log);
967
}
968
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
971
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
976
" object.\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
}
980
981
{
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
989
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
993
NULL, &error);
994
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
997
}
998
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
AVAHI_PROTO_INET6,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1012
if (sb == NULL) {
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
1019
/* Run the main loop */
1020
1021
if (debug){
1022
fprintf(stderr, "Starting Avahi loop search\n");
1023
}
1024
1025
avahi_simple_poll_loop(mc.simple_poll);
1026
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1188
}
1189
1190
if(connect_to != NULL){
1191
/* Connect directly, do not use Zeroconf */
1192
/* (Mainly meant for debugging) */
1193
char *address = strrchr(connect_to, ':');
1194
if(address == NULL){
1195
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
uint16_t port;
1200
errno = 0;
1201
tmpmax = strtoimax(address+1, &tmp, 10);
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1203
or tmpmax != (uint16_t)tmpmax){
1204
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
1208
port = (uint16_t)tmpmax;
1209
*address = '\0';
1210
address = connect_to;
1211
/* Colon in address indicates IPv6 */
1212
int af;
1213
if(strchr(address, ':') != NULL){
1214
af = AF_INET6;
1215
} else {
1216
af = AF_INET;
1217
}
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
1222
exitcode = EXIT_SUCCESS;
1223
}
1224
goto end;
1225
}
1226
1227
{
1228
AvahiServerConfig config;
1229
/* Do not publish any local Zeroconf records */
1230
avahi_server_config_init(&config);
1231
config.publish_hinfo = 0;
1232
config.publish_addresses = 0;
1233
config.publish_workstation = 0;
1234
config.publish_domain = 0;
1235
1236
/* Allocate a new server */
1237
mc.server = avahi_server_new(avahi_simple_poll_get
1238
(mc.simple_poll), &config, NULL,
1239
NULL, &error);
1240
1241
/* Free the Avahi configuration data */
1242
avahi_server_config_free(&config);
1243
}
1244
1245
/* Check if creating the Avahi server object succeeded */
1246
if(mc.server == NULL){
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
1248
avahi_strerror(error));
1249
exitcode = EXIT_FAILURE;
1250
goto end;
1251
}
1252
1253
/* Create the Avahi service browser */
1254
sb = avahi_s_service_browser_new(mc.server, if_index,
1255
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1256
NULL, 0, browse_callback, NULL);
1257
if(sb == NULL){
1258
fprintf(stderr, "Failed to create service browser: %s\n",
1259
avahi_strerror(avahi_server_errno(mc.server)));
1260
exitcode = EXIT_FAILURE;
1261
goto end;
1262
}
1263
1264
/* Run the main loop */
1265
1266
if(debug){
1267
fprintf(stderr, "Starting Avahi loop search\n");
1268
}
1269
1270
avahi_simple_poll_loop(mc.simple_poll);
1271
1027
1272
end:
1028
1029
if (debug){
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1031
}
1032
1033
/* Cleanup things */
1034
if (sb != NULL)
1035
avahi_s_service_browser_free(sb);
1036
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1048
}
1049
1050
return exitcode;
1273
1274
if(debug){
1275
fprintf(stderr, "%s exiting\n", argv[0]);
1276
}
1277
1278
/* Cleanup things */
1279
if(sb != NULL)
1280
avahi_s_service_browser_free(sb);
1281
1282
if(mc.server != NULL)
1283
avahi_server_free(mc.server);
1284
1285
if(mc.simple_poll != NULL)
1286
avahi_simple_poll_free(mc.simple_poll);
1287
1288
if(gnutls_initialized){
1289
gnutls_certificate_free_credentials(mc.cred);
1290
gnutls_global_deinit();
1291
gnutls_dh_params_deinit(mc.dh_params);
1292
}
1293
1294
if(gpgme_initialized){
1295
gpgme_release(mc.ctx);
1296
}
1297
1298
/* Removes the temp directory used by GPGME */
1299
if(tempdir_created){
1300
DIR *d;
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1303
if(d == NULL){
1304
if(errno != ENOENT){
1305
perror("opendir");
1306
}
1307
} else {
1308
while(true){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1311
break;
1312
}
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
continue;
1319
}
1320
char *fullname = NULL;
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
1322
direntry->d_name);
1323
if(ret < 0){
1324
perror("asprintf");
1325
continue;
1326
}
1327
ret = remove(fullname);
1328
if(ret == -1){
1329
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1330
strerror(errno));
1331
}
1332
free(fullname);
1333
}
1334
closedir(d);
1335
}
1336
ret = rmdir(tempdir);
1337
if(ret == -1 and errno != ENOENT){
1338
perror("rmdir");
1339
}
1340
}
1341
1342
return exitcode;
1051
1343
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0