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24.1.37
(compared to revision 237.2.115)
: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-10 00:21:08 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 59.
- Revision ID: belorn@braxen-20080810002108-ye1e88yto19lsctt
name change for argp
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
54
struct in6_addr, inet_pton(),
55
connect() */
64
56
#include <assert.h> /* assert() */
65
57
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
58
#include <time.h> /* time() */
67
59
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
60
SIOCSIFFLAGS, if_indextoname(),
69
61
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
62
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
63
getuid(), getgid(), setuid(),
75
64
setgid() */
65
#include <netinet/in.h>
76
66
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
67
#include <iso646.h> /* not, and */
78
68
#include <argp.h> /* struct argp_option, error_t, struct
79
69
argp_state, struct argp,
80
70
argp_parse(), ARGP_KEY_ARG,
81
71
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
72
90
73
/* Avahi */
91
74
/* All Avahi types, constants and functions
99
82
#include <avahi-common/error.h>
100
83
101
84
/* GnuTLS */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
104
86
gnutls_*
105
87
init_gnutls_session(),
106
88
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
90
GNUTLS_OPENPGP_FMT_BASE64 */
110
91
111
92
/* GPGME */
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
93
#include <gpgme.h> /* All GPGME types, constants and functions
114
94
gpgme_*
115
95
GPGME_PROTOCOL_OpenPGP,
116
96
GPG_ERR_NO_* */
117
97
118
98
#define BUFFER_SIZE 256
119
99
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
100
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
125
102
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
103
const char *argp_program_version = "password-request 1.0";
127
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
105
129
106
/* Used for passing in values through the Avahi callback functions */
134
111
unsigned int dh_bits;
135
112
gnutls_dh_params_t dh_params;
136
113
const char *priority;
137
gpgme_ctx_t ctx;
138
114
} mandos_context;
139
115
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
116
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
117
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* "buffer_capacity" is how much is currently allocated,
148
119
* "buffer_length" is how much is already used.
149
120
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
122
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
124
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
125
if (buffer == NULL){
155
126
return 0;
156
127
}
157
128
buffer_capacity += BUFFER_SIZE;
160
131
}
161
132
162
133
/*
163
* Initialize GPGME.
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
164
136
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
138
size_t crypto_size,
139
char **plaintext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
142
gpgme_ctx_t ctx;
168
143
gpgme_error_t rc;
144
ssize_t ret;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
169
147
gpgme_engine_info_t engine_info;
170
148
171
172
/*
173
* Helper function to insert pub and seckey to the engine keyring.
174
*/
175
bool import_key(const char *filename){
176
int fd;
177
gpgme_data_t pgp_data;
178
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
if(fd == -1){
181
perror("open");
182
return false;
183
}
184
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
if(ret == -1){
201
perror("close");
202
}
203
gpgme_data_release(pgp_data);
204
return true;
205
}
206
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
149
if (debug){
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
151
}
210
152
211
153
/* Init GPGME */
212
154
gpgme_check_version(NULL);
213
155
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
156
if (rc != GPG_ERR_NO_ERROR){
215
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
158
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
159
return -1;
218
160
}
219
161
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
162
/* Set GPGME home directory for the OpenPGP engine only */
163
rc = gpgme_get_engine_info (&engine_info);
164
if (rc != GPG_ERR_NO_ERROR){
223
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
166
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
167
return -1;
226
168
}
227
169
while(engine_info != NULL){
228
170
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
171
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
172
engine_info->file_name, homedir);
231
173
break;
232
174
}
233
175
engine_info = engine_info->next;
234
176
}
235
177
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
179
return -1;
270
180
}
271
181
272
182
/* Create new GPGME data buffer from memory cryptotext */
273
183
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
184
0);
275
if(rc != GPG_ERR_NO_ERROR){
185
if (rc != GPG_ERR_NO_ERROR){
276
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
187
gpgme_strsource(rc), gpgme_strerror(rc));
278
188
return -1;
280
190
281
191
/* Create new empty GPGME data buffer for the plaintext */
282
192
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
193
if (rc != GPG_ERR_NO_ERROR){
284
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
195
gpgme_strsource(rc), gpgme_strerror(rc));
286
196
gpgme_data_release(dh_crypto);
287
197
return -1;
288
198
}
289
199
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
206
goto decrypt_end;
207
}
208
290
209
/* Decrypt data from the cryptotext data buffer to the plaintext
291
210
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
294
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
214
gpgme_strsource(rc), gpgme_strerror(rc));
296
215
plaintext_length = -1;
297
if(debug){
298
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
307
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
309
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
216
goto decrypt_end;
217
}
218
219
if(debug){
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
221
}
222
223
if (debug){
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
226
if (result == NULL){
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
228
} else {
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
235
}
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
238
if(recipient){
312
239
while(recipient != NULL){
313
240
fprintf(stderr, "Public key algorithm: %s\n",
314
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
247
}
321
248
}
322
249
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
250
}
329
251
330
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
333
255
plaintext_length = -1;
334
256
goto decrypt_end;
335
257
}
336
258
337
259
*plaintext = NULL;
338
260
while(true){
339
plaintext_capacity = incbuffer(plaintext,
261
plaintext_capacity = adjustbuffer(plaintext,
340
262
(size_t)plaintext_length,
341
263
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
344
266
plaintext_length = -1;
345
267
goto decrypt_end;
346
268
}
348
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
271
BUFFER_SIZE);
350
272
/* Print the data, if any */
351
if(ret == 0){
273
if (ret == 0){
352
274
/* EOF */
353
275
break;
354
276
}
359
281
}
360
282
plaintext_length += ret;
361
283
}
362
284
363
285
if(debug){
364
286
fprintf(stderr, "Decrypted password is: ");
365
287
for(ssize_t i = 0; i < plaintext_length; i++){
378
300
return plaintext_length;
379
301
}
380
302
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value);
305
if (ret == NULL)
385
306
ret = "(unknown)";
386
307
return ret;
387
308
}
392
313
fprintf(stderr, "GnuTLS: %s", string);
393
314
}
394
315
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
397
319
int ret;
398
320
399
321
if(debug){
401
323
}
402
324
403
325
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
407
329
return -1;
408
330
}
409
331
410
if(debug){
332
if (debug){
411
333
/* "Use a log level over 10 to enable all debugging options."
412
334
* - GnuTLS manual
413
335
*/
416
338
}
417
339
418
340
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
427
346
return -1;
428
347
}
429
348
430
349
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
434
353
}
435
354
436
355
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
438
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
440
358
fprintf(stderr,
441
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
444
362
safer_gnutls_strerror(ret));
445
363
goto globalfail;
446
364
}
447
365
448
366
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
463
367
ret = gnutls_dh_params_init(&mc->dh_params);
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
371
goto globalfail;
372
}
373
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
377
goto globalfail;
378
}
379
380
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
381
464
382
return 0;
465
383
466
384
globalfail:
467
468
gnutls_certificate_free_credentials(mc.cred);
385
386
gnutls_certificate_free_credentials(mc->cred);
469
387
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
388
return -1;
389
472
390
}
473
391
474
static int init_gnutls_session(gnutls_session_t *session){
392
static int init_gnutls_session(mandos_context *mc,
393
gnutls_session_t *session){
475
394
int ret;
476
395
/* GnuTLS session creation */
477
396
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
397
if (ret != GNUTLS_E_SUCCESS){
479
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
399
safer_gnutls_strerror(ret));
481
400
}
482
401
483
402
{
484
403
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
487
406
fprintf(stderr, "Syntax error at: %s\n", err);
488
407
fprintf(stderr, "GnuTLS error: %s\n",
489
408
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
409
gnutls_deinit (*session);
491
410
return -1;
492
411
}
493
412
}
494
413
495
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
415
mc->cred);
416
if (ret != GNUTLS_E_SUCCESS) {
498
417
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
418
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
419
gnutls_deinit (*session);
501
420
return -1;
502
421
}
503
422
504
423
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
424
gnutls_certificate_server_set_request (*session,
425
GNUTLS_CERT_IGNORE);
507
426
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
428
510
429
return 0;
511
430
}
517
436
/* Called when a Mandos server is found */
518
437
static int start_mandos_communication(const char *ip, uint16_t port,
519
438
AvahiIfIndex if_index,
520
int af){
439
mandos_context *mc){
521
440
int ret, tcp_sd;
522
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
527
442
char *buffer = NULL;
528
443
char *decrypted_buffer;
529
444
size_t buffer_length = 0;
531
446
ssize_t decrypted_buffer_size;
532
447
size_t written;
533
448
int retval = 0;
449
char interface[IF_NAMESIZE];
534
450
gnutls_session_t session;
535
int pf; /* Protocol family */
536
537
switch(af){
538
case AF_INET6:
539
pf = PF_INET6;
540
break;
541
case AF_INET:
542
pf = PF_INET;
543
break;
544
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
546
return -1;
547
}
548
549
ret = init_gnutls_session(&session);
550
if(ret != 0){
451
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
551
454
return -1;
552
455
}
553
456
554
457
if(debug){
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
556
"\n", ip, port);
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
459
ip, port);
557
460
}
558
461
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
560
if(tcp_sd < 0){
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
463
if(tcp_sd < 0) {
561
464
perror("socket");
562
465
return -1;
563
466
}
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
perror("if_indextoname");
471
return -1;
472
}
473
fprintf(stderr, "Binding to interface %s\n", interface);
474
}
564
475
565
memset(&to, 0, sizeof(to));
566
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
569
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
572
}
573
if(ret < 0 ){
476
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
481
if (ret < 0 ){
574
482
perror("inet_pton");
575
483
return -1;
576
484
}
578
486
fprintf(stderr, "Bad address: %s\n", ip);
579
487
return -1;
580
488
}
581
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
593
}
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
596
}
597
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
601
}
489
to.in6.sin6_port = htons(port); /* Spurious warning */
490
491
to.in6.sin6_scope_id = (uint32_t)if_index;
602
492
603
493
if(debug){
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
608
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
611
}
612
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
615
}
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
627
498
perror("inet_ntop");
628
499
} else {
629
500
if(strcmp(addrstr, ip) != 0){
632
503
}
633
504
}
634
505
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
641
508
perror("connect");
642
509
return -1;
643
510
}
644
511
645
512
const char *out = mandos_protocol_version;
646
513
written = 0;
647
while(true){
514
while (true){
648
515
size_t out_size = strlen(out);
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
650
517
out_size - written));
651
if(ret == -1){
518
if (ret == -1){
652
519
perror("write");
653
520
retval = -1;
654
521
goto mandos_end;
657
524
if(written < out_size){
658
525
continue;
659
526
} else {
660
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
661
528
written = 0;
662
529
out = "\r\n";
663
530
} else {
665
532
}
666
533
}
667
534
}
668
535
669
536
if(debug){
670
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
538
}
672
539
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
675
542
do{
676
ret = gnutls_handshake(session);
543
ret = gnutls_handshake (session);
677
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
545
679
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
680
547
if(debug){
681
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
682
gnutls_perror(ret);
549
gnutls_perror (ret);
683
550
}
684
551
retval = -1;
685
552
goto mandos_end;
688
555
/* Read OpenPGP packet that contains the wanted password */
689
556
690
557
if(debug){
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
692
559
ip);
693
560
}
694
561
695
562
while(true){
696
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
697
564
buffer_capacity);
698
if(buffer_capacity == 0){
699
perror("incbuffer");
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
700
567
retval = -1;
701
568
goto mandos_end;
702
569
}
703
570
704
sret = gnutls_record_recv(session, buffer+buffer_length,
705
BUFFER_SIZE);
706
if(sret == 0){
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
707
574
break;
708
575
}
709
if(sret < 0){
710
switch(sret){
576
if (ret < 0){
577
switch(ret){
711
578
case GNUTLS_E_INTERRUPTED:
712
579
case GNUTLS_E_AGAIN:
713
580
break;
714
581
case GNUTLS_E_REHANDSHAKE:
715
582
do{
716
ret = gnutls_handshake(session);
583
ret = gnutls_handshake (session);
717
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
718
if(ret < 0){
585
if (ret < 0){
719
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
720
gnutls_perror(ret);
587
gnutls_perror (ret);
721
588
retval = -1;
722
589
goto mandos_end;
723
590
}
726
593
fprintf(stderr, "Unknown error while reading data from"
727
594
" encrypted session with Mandos server\n");
728
595
retval = -1;
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
730
597
goto mandos_end;
731
598
}
732
599
} else {
733
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
734
601
}
735
602
}
736
603
738
605
fprintf(stderr, "Closing TLS session\n");
739
606
}
740
607
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
742
609
743
if(buffer_length > 0){
610
if (buffer_length > 0){
744
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
612
buffer_length,
746
&decrypted_buffer);
747
if(decrypted_buffer_size >= 0){
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
748
616
written = 0;
749
617
while(written < (size_t) decrypted_buffer_size){
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
752
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
753
621
if(ret == 0 and ferror(stdout)){
754
622
if(debug){
755
623
fprintf(stderr, "Error writing encrypted data: %s\n",
764
632
} else {
765
633
retval = -1;
766
634
}
767
} else {
768
retval = -1;
769
635
}
770
636
771
637
/* Shutdown procedure */
772
638
773
639
mandos_end:
774
640
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
778
}
779
gnutls_deinit(session);
641
close(tcp_sd);
642
gnutls_deinit (session);
780
643
return retval;
781
644
}
782
645
783
646
static void resolve_callback(AvahiSServiceResolver *r,
784
647
AvahiIfIndex interface,
785
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
786
649
AvahiResolverEvent event,
787
650
const char *name,
788
651
const char *type,
793
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
794
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
795
658
flags,
796
AVAHI_GCC_UNUSED void* userdata){
797
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
798
662
799
663
/* Called whenever a service has been resolved successfully or
800
664
timed out */
801
665
802
switch(event){
666
switch (event) {
803
667
default:
804
668
case AVAHI_RESOLVER_FAILURE:
805
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
806
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
807
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
808
672
break;
809
673
810
674
case AVAHI_RESOLVER_FOUND:
812
676
char ip[AVAHI_ADDRESS_STR_MAX];
813
677
avahi_address_snprint(ip, sizeof(ip), address);
814
678
if(debug){
815
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
816
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
817
ip, (intmax_t)interface, port);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
818
681
}
819
int ret = start_mandos_communication(ip, port, interface,
820
avahi_proto_to_af(proto));
821
if(ret == 0){
822
avahi_simple_poll_quit(mc.simple_poll);
682
int ret = start_mandos_communication(ip, port, interface, mc);
683
if (ret == 0){
684
exit(EXIT_SUCCESS);
823
685
}
824
686
}
825
687
}
826
688
avahi_s_service_resolver_free(r);
827
689
}
828
690
829
static void browse_callback(AvahiSServiceBrowser *b,
830
AvahiIfIndex interface,
831
AvahiProtocol protocol,
832
AvahiBrowserEvent event,
833
const char *name,
834
const char *type,
835
const char *domain,
836
AVAHI_GCC_UNUSED AvahiLookupResultFlags
837
flags,
838
AVAHI_GCC_UNUSED void* userdata){
839
assert(b);
691
static void browse_callback( AvahiSServiceBrowser *b,
692
AvahiIfIndex interface,
693
AvahiProtocol protocol,
694
AvahiBrowserEvent event,
695
const char *name,
696
const char *type,
697
const char *domain,
698
AVAHI_GCC_UNUSED AvahiLookupResultFlags
699
flags,
700
void* userdata) {
701
mandos_context *mc = userdata;
702
assert(b); /* Spurious warning */
840
703
841
704
/* Called whenever a new services becomes available on the LAN or
842
705
is removed from the LAN */
843
706
844
switch(event){
707
switch (event) {
845
708
default:
846
709
case AVAHI_BROWSER_FAILURE:
847
710
848
711
fprintf(stderr, "(Avahi browser) %s\n",
849
avahi_strerror(avahi_server_errno(mc.server)));
850
avahi_simple_poll_quit(mc.simple_poll);
712
avahi_strerror(avahi_server_errno(mc->server)));
713
avahi_simple_poll_quit(mc->simple_poll);
851
714
return;
852
715
853
716
case AVAHI_BROWSER_NEW:
856
719
the callback function is called the Avahi server will free the
857
720
resolver for us. */
858
721
859
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
860
name, type, domain, protocol, 0,
861
resolve_callback, NULL) == NULL)
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
723
protocol, name, type, domain,
724
AVAHI_PROTO_INET6, 0,
725
resolve_callback, mc)))
862
726
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
863
name, avahi_strerror(avahi_server_errno(mc.server)));
727
name, avahi_strerror(avahi_server_errno(mc->server)));
864
728
break;
865
729
866
730
case AVAHI_BROWSER_REMOVE:
875
739
}
876
740
}
877
741
878
sig_atomic_t quit_now = 0;
879
880
/* stop main loop after sigterm has been called */
881
static void handle_sigterm(__attribute__((unused)) int sig){
882
if(quit_now){
883
return;
884
}
885
quit_now = 1;
886
int old_errno = errno;
887
if(mc.simple_poll != NULL){
888
avahi_simple_poll_quit(mc.simple_poll);
889
}
890
errno = old_errno;
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
748
if (tmp == NULL){
749
return NULL;
750
}
751
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
753
}
754
tmp[f_len] = '/';
755
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
757
}
758
tmp[f_len + 1 + s_len] = '\0';
759
return tmp;
891
760
}
892
761
762
893
763
int main(int argc, char *argv[]){
894
AvahiSServiceBrowser *sb = NULL;
895
int error;
896
int ret;
897
intmax_t tmpmax;
898
char *tmp;
899
int exitcode = EXIT_SUCCESS;
900
const char *interface = "eth0";
901
struct ifreq network;
902
int sd = -1;
903
bool interface_taken_up = false;
904
uid_t uid;
905
gid_t gid;
906
char *connect_to = NULL;
907
char tempdir[] = "/tmp/mandosXXXXXX";
908
bool tempdir_created = false;
909
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
910
const char *seckey = PATHDIR "/" SECKEY;
911
const char *pubkey = PATHDIR "/" PUBKEY;
912
913
bool gnutls_initialized = false;
914
bool gpgme_initialized = false;
915
float delay = 2.5f;
916
917
struct sigaction old_sigterm_action;
918
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
919
920
{
921
struct argp_option options[] = {
922
{ .name = "debug", .key = 128,
923
.doc = "Debug mode", .group = 3 },
924
{ .name = "connect", .key = 'c',
925
.arg = "ADDRESS:PORT",
926
.doc = "Connect directly to a specific Mandos server",
927
.group = 1 },
928
{ .name = "interface", .key = 'i',
929
.arg = "NAME",
930
.doc = "Network interface that will be used to search for"
931
" Mandos servers",
932
.group = 1 },
933
{ .name = "seckey", .key = 's',
934
.arg = "FILE",
935
.doc = "OpenPGP secret key file base name",
936
.group = 1 },
937
{ .name = "pubkey", .key = 'p',
938
.arg = "FILE",
939
.doc = "OpenPGP public key file base name",
940
.group = 2 },
941
{ .name = "dh-bits", .key = 129,
942
.arg = "BITS",
943
.doc = "Bit length of the prime number used in the"
944
" Diffie-Hellman key exchange",
945
.group = 2 },
946
{ .name = "priority", .key = 130,
947
.arg = "STRING",
948
.doc = "GnuTLS priority string for the TLS handshake",
949
.group = 1 },
950
{ .name = "delay", .key = 131,
951
.arg = "SECONDS",
952
.doc = "Maximum delay to wait for interface startup",
953
.group = 2 },
954
{ .name = NULL }
955
};
956
957
error_t parse_opt(int key, char *arg,
958
struct argp_state *state){
959
switch(key){
960
case 128: /* --debug */
961
debug = true;
962
break;
963
case 'c': /* --connect */
964
connect_to = arg;
965
break;
966
case 'i': /* --interface */
967
interface = arg;
968
break;
969
case 's': /* --seckey */
970
seckey = arg;
971
break;
972
case 'p': /* --pubkey */
973
pubkey = arg;
974
break;
975
case 129: /* --dh-bits */
976
errno = 0;
977
tmpmax = strtoimax(arg, &tmp, 10);
978
if(errno != 0 or tmp == arg or *tmp != '\0'
979
or tmpmax != (typeof(mc.dh_bits))tmpmax){
980
fprintf(stderr, "Bad number of DH bits\n");
981
exit(EXIT_FAILURE);
982
}
983
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
984
break;
985
case 130: /* --priority */
986
mc.priority = arg;
987
break;
988
case 131: /* --delay */
989
errno = 0;
990
delay = strtof(arg, &tmp);
991
if(errno != 0 or tmp == arg or *tmp != '\0'){
992
fprintf(stderr, "Bad delay\n");
993
exit(EXIT_FAILURE);
994
}
995
break;
996
case ARGP_KEY_ARG:
997
argp_usage(state);
998
case ARGP_KEY_END:
999
break;
1000
default:
1001
return ARGP_ERR_UNKNOWN;
1002
}
1003
return 0;
1004
}
1005
1006
struct argp argp = { .options = options, .parser = parse_opt,
1007
.args_doc = "",
1008
.doc = "Mandos client -- Get and decrypt"
1009
" passwords from a Mandos server" };
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1014
goto end;
1015
}
1016
}
1017
1018
if(not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1023
from the signal handler */
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if(mc.simple_poll == NULL){
1028
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
sigemptyset(&sigterm_action.sa_mask);
1034
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1035
if(ret == -1){
1036
perror("sigaddset");
1037
exitcode = EXIT_FAILURE;
1038
goto end;
1039
}
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1041
if(ret == -1){
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1044
goto end;
1045
}
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1047
if(ret == -1){
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
1059
/* If the interface is down, bring it up */
1060
if(interface[0] != '\0'){
1061
#ifdef __linux__
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1063
messages to mess up the prompt */
1064
ret = klogctl(8, NULL, 5);
1065
bool restore_loglevel = true;
1066
if(ret == -1){
1067
restore_loglevel = false;
1068
perror("klogctl");
1069
}
1070
#endif /* __linux__ */
1071
1072
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1073
if(sd < 0){
1074
perror("socket");
1075
exitcode = EXIT_FAILURE;
1076
#ifdef __linux__
1077
if(restore_loglevel){
1078
ret = klogctl(7, NULL, 0);
1079
if(ret == -1){
1080
perror("klogctl");
1081
}
1082
}
1083
#endif /* __linux__ */
1084
goto end;
1085
}
1086
strcpy(network.ifr_name, interface);
1087
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1088
if(ret == -1){
1089
perror("ioctl SIOCGIFFLAGS");
1090
#ifdef __linux__
1091
if(restore_loglevel){
1092
ret = klogctl(7, NULL, 0);
1093
if(ret == -1){
1094
perror("klogctl");
1095
}
1096
}
1097
#endif /* __linux__ */
1098
exitcode = EXIT_FAILURE;
1099
goto end;
1100
}
1101
if((network.ifr_flags & IFF_UP) == 0){
1102
network.ifr_flags |= IFF_UP;
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1104
if(ret == -1){
1105
perror("ioctl SIOCSIFFLAGS");
764
AvahiSServiceBrowser *sb = NULL;
765
int error;
766
int ret;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
770
int sd;
771
uid_t uid;
772
gid_t gid;
773
char *connect_to = NULL;
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
780
781
{
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
788
.group = 1 },
789
{ .name = "interface", .key = 'i',
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "dh-bits to use in gnutls communication",
808
.group = 2 },
809
{ .name = "priority", .key = 130,
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
812
{ .name = NULL }
813
};
814
815
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128:
822
debug = true;
823
break;
824
case 'c':
825
connect_to = arg;
826
break;
827
case 'i':
828
interface = arg;
829
break;
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyfile = arg;
835
break;
836
case 'p':
837
pubkeyfile = arg;
838
break;
839
case 129:
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
844
exit(EXIT_FAILURE);
845
}
846
break;
847
case 130:
848
mc.priority = arg;
849
break;
850
case ARGP_KEY_ARG:
851
argp_usage (state);
852
break;
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
859
}
860
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
1106
868
exitcode = EXIT_FAILURE;
1107
#ifdef __linux__
1108
if(restore_loglevel){
1109
ret = klogctl(7, NULL, 0);
1110
if(ret == -1){
1111
perror("klogctl");
1112
}
1113
}
1114
#endif /* __linux__ */
1115
869
goto end;
1116
870
}
1117
interface_taken_up = true;
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
break;
1126
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
if(not interface_taken_up){
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1137
}
1138
}
1139
#ifdef __linux__
1140
if(restore_loglevel){
1141
/* Restores kernel loglevel to default */
1142
ret = klogctl(7, NULL, 0);
1143
if(ret == -1){
1144
perror("klogctl");
1145
}
1146
}
1147
#endif /* __linux__ */
1148
}
1149
1150
uid = getuid();
1151
gid = getgid();
1152
1153
errno = 0;
1154
setgid(gid);
1155
if(ret == -1){
1156
perror("setgid");
1157
}
1158
1159
ret = setuid(uid);
1160
if(ret == -1){
1161
perror("setuid");
1162
}
1163
1164
ret = init_gnutls_global(pubkey, seckey);
1165
if(ret == -1){
1166
fprintf(stderr, "init_gnutls_global failed\n");
1167
exitcode = EXIT_FAILURE;
1168
goto end;
1169
} else {
1170
gnutls_initialized = true;
1171
}
1172
1173
if(mkdtemp(tempdir) == NULL){
1174
perror("mkdtemp");
1175
goto end;
1176
}
1177
tempdir_created = true;
1178
1179
if(not init_gpgme(pubkey, seckey, tempdir)){
1180
fprintf(stderr, "init_gpgme failed\n");
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
} else {
1184
gpgme_initialized = true;
1185
}
1186
1187
if(interface[0] != '\0'){
871
}
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global\n");
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
uid = getuid();
895
gid = getgid();
896
897
ret = setuid(uid);
898
if (ret == -1){
899
perror("setuid");
900
}
901
902
setgid(gid);
903
if (ret == -1){
904
perror("setgid");
905
}
906
1188
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
1189
908
if(if_index == 0){
1190
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1191
exitcode = EXIT_FAILURE;
1192
goto end;
1193
}
1194
}
1195
1196
if(connect_to != NULL){
1197
/* Connect directly, do not use Zeroconf */
1198
/* (Mainly meant for debugging) */
1199
char *address = strrchr(connect_to, ':');
1200
if(address == NULL){
1201
fprintf(stderr, "No colon in address\n");
1202
exitcode = EXIT_FAILURE;
1203
goto end;
1204
}
1205
uint16_t port;
1206
errno = 0;
1207
tmpmax = strtoimax(address+1, &tmp, 10);
1208
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1209
or tmpmax != (uint16_t)tmpmax){
1210
fprintf(stderr, "Bad port number\n");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
port = (uint16_t)tmpmax;
1215
*address = '\0';
1216
address = connect_to;
1217
/* Colon in address indicates IPv6 */
1218
int af;
1219
if(strchr(address, ':') != NULL){
1220
af = AF_INET6;
1221
} else {
1222
af = AF_INET;
1223
}
1224
ret = start_mandos_communication(address, port, if_index, af);
1225
if(ret < 0){
1226
exitcode = EXIT_FAILURE;
1227
} else {
1228
exitcode = EXIT_SUCCESS;
1229
}
1230
goto end;
1231
}
1232
1233
{
1234
AvahiServerConfig config;
1235
/* Do not publish any local Zeroconf records */
1236
avahi_server_config_init(&config);
1237
config.publish_hinfo = 0;
1238
config.publish_addresses = 0;
1239
config.publish_workstation = 0;
1240
config.publish_domain = 0;
1241
1242
/* Allocate a new server */
1243
mc.server = avahi_server_new(avahi_simple_poll_get
1244
(mc.simple_poll), &config, NULL,
1245
NULL, &error);
1246
1247
/* Free the Avahi configuration data */
1248
avahi_server_config_free(&config);
1249
}
1250
1251
/* Check if creating the Avahi server object succeeded */
1252
if(mc.server == NULL){
1253
fprintf(stderr, "Failed to create Avahi server: %s\n",
1254
avahi_strerror(error));
1255
exitcode = EXIT_FAILURE;
1256
goto end;
1257
}
1258
1259
/* Create the Avahi service browser */
1260
sb = avahi_s_service_browser_new(mc.server, if_index,
1261
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1262
NULL, 0, browse_callback, NULL);
1263
if(sb == NULL){
1264
fprintf(stderr, "Failed to create service browser: %s\n",
1265
avahi_strerror(avahi_server_errno(mc.server)));
1266
exitcode = EXIT_FAILURE;
1267
goto end;
1268
}
1269
1270
/* Run the main loop */
1271
1272
if(debug){
1273
fprintf(stderr, "Starting Avahi loop search\n");
1274
}
1275
1276
avahi_simple_poll_loop(mc.simple_poll);
1277
910
exit(EXIT_FAILURE);
911
}
912
913
if(connect_to != NULL){
914
/* Connect directly, do not use Zeroconf */
915
/* (Mainly meant for debugging) */
916
char *address = strrchr(connect_to, ':');
917
if(address == NULL){
918
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
920
goto end;
921
}
922
errno = 0;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
924
if(errno){
925
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
*address = '\0';
930
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
932
if(ret < 0){
933
exitcode = EXIT_FAILURE;
934
} else {
935
exitcode = EXIT_SUCCESS;
936
}
937
goto end;
938
}
939
940
/* If the interface is down, bring it up */
941
{
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
943
if(sd < 0) {
944
perror("socket");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
950
if(ret == -1){
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
958
if(ret == -1){
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
}
964
close(sd);
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
1278
1029
end:
1279
1280
if(debug){
1281
fprintf(stderr, "%s exiting\n", argv[0]);
1282
}
1283
1284
/* Cleanup things */
1285
if(sb != NULL)
1286
avahi_s_service_browser_free(sb);
1287
1288
if(mc.server != NULL)
1289
avahi_server_free(mc.server);
1290
1291
if(mc.simple_poll != NULL)
1292
avahi_simple_poll_free(mc.simple_poll);
1293
1294
if(gnutls_initialized){
1295
gnutls_certificate_free_credentials(mc.cred);
1296
gnutls_global_deinit();
1297
gnutls_dh_params_deinit(mc.dh_params);
1298
}
1299
1300
if(gpgme_initialized){
1301
gpgme_release(mc.ctx);
1302
}
1303
1304
/* Take down the network interface */
1305
if(interface_taken_up){
1306
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1307
if(ret == -1){
1308
perror("ioctl SIOCGIFFLAGS");
1309
} else if(network.ifr_flags & IFF_UP) {
1310
network.ifr_flags &= ~IFF_UP; /* clear flag */
1311
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1312
if(ret == -1){
1313
perror("ioctl SIOCSIFFLAGS");
1314
}
1315
}
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
1322
/* Removes the temp directory used by GPGME */
1323
if(tempdir_created){
1324
DIR *d;
1325
struct dirent *direntry;
1326
d = opendir(tempdir);
1327
if(d == NULL){
1328
if(errno != ENOENT){
1329
perror("opendir");
1330
}
1331
} else {
1332
while(true){
1333
direntry = readdir(d);
1334
if(direntry == NULL){
1335
break;
1336
}
1337
/* Skip "." and ".." */
1338
if(direntry->d_name[0] == '.'
1339
and (direntry->d_name[1] == '\0'
1340
or (direntry->d_name[1] == '.'
1341
and direntry->d_name[2] == '\0'))){
1342
continue;
1343
}
1344
char *fullname = NULL;
1345
ret = asprintf(&fullname, "%s/%s", tempdir,
1346
direntry->d_name);
1347
if(ret < 0){
1348
perror("asprintf");
1349
continue;
1350
}
1351
ret = remove(fullname);
1352
if(ret == -1){
1353
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1354
strerror(errno));
1355
}
1356
free(fullname);
1357
}
1358
closedir(d);
1359
}
1360
ret = rmdir(tempdir);
1361
if(ret == -1 and errno != ENOENT){
1362
perror("rmdir");
1363
}
1364
}
1365
1366
return exitcode;
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfile);
1045
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
1367
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0