To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/password-request.c
- browse files at revision 24.1.35
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.35
- Committer: Björn Påhlsson
- Date: 2008-08-10 00:18:25 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 59.
- Revision ID: belorn@braxen-20080810001825-nxr0rza1hclj4mr7
version 1.0
- files added:
- mandos-client.xml
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
8
8
* includes the following functions: "resolve_callback",
9
9
* "browse_callback", and parts of "main".
10
10
*
11
* Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
12
* Påhlsson.
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
13
13
*
14
14
* This program is free software: you can redistribute it and/or
15
15
* modify it under the terms of the GNU General Public License as
25
25
* along with this program. If not, see
26
26
* <http://www.gnu.org/licenses/>.
27
27
*
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
#define _FORTIFY_SOURCE 2
33
31
/* Needed by GPGME, specifically gpgme_data_seek() */
34
32
#define _LARGEFILE_SOURCE
35
33
#define _FILE_OFFSET_BITS 64
36
34
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
40
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
55
connect() */
56
#include <assert.h> /* assert() */
57
#include <errno.h> /* perror(), errno */
58
#include <time.h> /* time() */
59
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
60
SIOCSIFFLAGS, if_indextoname(),
61
if_nametoindex(), IF_NAMESIZE */
62
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
63
getuid(), getgid(), setuid(),
64
setgid() */
65
#include <netinet/in.h>
66
#include <arpa/inet.h> /* inet_pton(), htons */
67
#include <iso646.h> /* not, and */
68
#include <argp.h> /* struct argp_option, error_t, struct
69
argp_state, struct argp,
70
argp_parse(), ARGP_KEY_ARG,
71
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
72
73
/* Avahi */
74
/* All Avahi types, constants and functions
75
Avahi*, avahi_*,
76
AVAHI_* */
43
77
#include <avahi-core/core.h>
44
78
#include <avahi-core/lookup.h>
45
79
#include <avahi-core/log.h>
47
81
#include <avahi-common/malloc.h>
48
82
#include <avahi-common/error.h>
49
83
50
//mandos client part
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
63
64
// gpgme
65
#include <errno.h> /* perror() */
66
#include <gpgme.h>
67
68
// getopt long
69
#include <getopt.h>
70
71
#ifndef CERT_ROOT
72
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
73
#endif
74
#define CERTFILE CERT_ROOT "openpgp-client.txt"
75
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
84
/* GnuTLS */
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
86
gnutls_*
87
init_gnutls_session(),
88
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
91
92
/* GPGME */
93
#include <gpgme.h> /* All GPGME types, constants and functions
94
gpgme_*
95
GPGME_PROTOCOL_OpenPGP,
96
GPG_ERR_NO_* */
97
76
98
#define BUFFER_SIZE 256
77
#define DH_BITS 1024
78
99
79
100
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
102
static const char mandos_protocol_version[] = "1";
103
const char *argp_program_version = "mandosclient 1.0";
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
80
105
106
/* Used for passing in values through the Avahi callback functions */
81
107
typedef struct {
82
gnutls_session_t session;
108
AvahiSimplePoll *simple_poll;
109
AvahiServer *server;
83
110
gnutls_certificate_credentials_t cred;
111
unsigned int dh_bits;
84
112
gnutls_dh_params_t dh_params;
85
} encrypted_session;
86
87
88
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet, const char *homedir){
113
const char *priority;
114
} mandos_context;
115
116
/*
117
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* "buffer_capacity" is how much is currently allocated,
119
* "buffer_length" is how much is already used.
120
*/
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
122
size_t buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
124
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
125
if (buffer == NULL){
126
return 0;
127
}
128
buffer_capacity += BUFFER_SIZE;
129
}
130
return buffer_capacity;
131
}
132
133
/*
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
136
*/
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
138
size_t crypto_size,
139
char **plaintext,
140
const char *homedir){
90
141
gpgme_data_t dh_crypto, dh_plain;
91
142
gpgme_ctx_t ctx;
92
143
gpgme_error_t rc;
93
144
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
96
147
gpgme_engine_info_t engine_info;
97
148
98
149
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
100
151
}
101
152
102
153
/* Init GPGME */
103
154
gpgme_check_version(NULL);
104
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
155
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
156
if (rc != GPG_ERR_NO_ERROR){
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
158
gpgme_strsource(rc), gpgme_strerror(rc));
159
return -1;
160
}
105
161
106
/* Set GPGME home directory */
162
/* Set GPGME home directory for the OpenPGP engine only */
107
163
rc = gpgme_get_engine_info (&engine_info);
108
164
if (rc != GPG_ERR_NO_ERROR){
109
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
119
175
engine_info = engine_info->next;
120
176
}
121
177
if(engine_info == NULL){
122
fprintf(stderr, "Could not set home dir to %s\n", homedir);
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
123
179
return -1;
124
180
}
125
181
126
/* Create new GPGME data buffer from packet buffer */
127
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
182
/* Create new GPGME data buffer from memory cryptotext */
183
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
184
0);
128
185
if (rc != GPG_ERR_NO_ERROR){
129
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
130
187
gpgme_strsource(rc), gpgme_strerror(rc));
136
193
if (rc != GPG_ERR_NO_ERROR){
137
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
138
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
gpgme_data_release(dh_crypto);
139
197
return -1;
140
198
}
141
199
144
202
if (rc != GPG_ERR_NO_ERROR){
145
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
146
204
gpgme_strsource(rc), gpgme_strerror(rc));
147
return -1;
205
plaintext_length = -1;
206
goto decrypt_end;
148
207
}
149
208
150
/* Decrypt data from the FILE pointer to the plaintext data
151
buffer */
209
/* Decrypt data from the cryptotext data buffer to the plaintext
210
data buffer */
152
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
153
212
if (rc != GPG_ERR_NO_ERROR){
154
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
155
214
gpgme_strsource(rc), gpgme_strerror(rc));
156
return -1;
215
plaintext_length = -1;
216
goto decrypt_end;
157
217
}
158
218
159
219
if(debug){
160
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
161
221
}
162
222
163
223
if (debug){
164
224
gpgme_decrypt_result_t result;
165
225
result = gpgme_op_decrypt_result(ctx);
189
249
}
190
250
}
191
251
192
/* Delete the GPGME FILE pointer cryptotext data buffer */
193
gpgme_data_release(dh_crypto);
194
195
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
196
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
197
198
*new_packet = 0;
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
255
plaintext_length = -1;
256
goto decrypt_end;
257
}
258
259
*plaintext = NULL;
199
260
while(true){
200
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
201
*new_packet = realloc(*new_packet,
202
(unsigned int)new_packet_capacity
203
+ BUFFER_SIZE);
204
if (*new_packet == NULL){
205
perror("realloc");
206
return -1;
207
}
208
new_packet_capacity += BUFFER_SIZE;
261
plaintext_capacity = adjustbuffer(plaintext,
262
(size_t)plaintext_length,
263
plaintext_capacity);
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
266
plaintext_length = -1;
267
goto decrypt_end;
209
268
}
210
269
211
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
212
271
BUFFER_SIZE);
213
272
/* Print the data, if any */
214
273
if (ret == 0){
274
/* EOF */
215
275
break;
216
276
}
217
277
if(ret < 0){
218
278
perror("gpgme_data_read");
219
return -1;
279
plaintext_length = -1;
280
goto decrypt_end;
220
281
}
221
new_packet_length += ret;
282
plaintext_length += ret;
222
283
}
223
284
224
/* FIXME: check characters before printing to screen so to not print
225
terminal control characters */
226
/* if(debug){ */
227
/* fprintf(stderr, "decrypted password is: "); */
228
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
229
/* fprintf(stderr, "\n"); */
230
/* } */
285
if(debug){
286
fprintf(stderr, "Decrypted password is: ");
287
for(ssize_t i = 0; i < plaintext_length; i++){
288
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
289
}
290
fprintf(stderr, "\n");
291
}
292
293
decrypt_end:
294
295
/* Delete the GPGME cryptotext data buffer */
296
gpgme_data_release(dh_crypto);
231
297
232
298
/* Delete the GPGME plaintext data buffer */
233
299
gpgme_data_release(dh_plain);
234
return new_packet_length;
300
return plaintext_length;
235
301
}
236
302
237
303
static const char * safer_gnutls_strerror (int value) {
241
307
return ret;
242
308
}
243
309
244
void debuggnutls(__attribute__((unused)) int level,
245
const char* string){
246
fprintf(stderr, "%s", string);
310
/* GnuTLS log function callback */
311
static void debuggnutls(__attribute__((unused)) int level,
312
const char* string){
313
fprintf(stderr, "GnuTLS: %s", string);
247
314
}
248
315
249
int initgnutls(encrypted_session *es){
250
const char *err;
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
251
319
int ret;
252
320
253
321
if(debug){
254
322
fprintf(stderr, "Initializing GnuTLS\n");
255
323
}
256
324
257
if ((ret = gnutls_global_init ())
258
!= GNUTLS_E_SUCCESS) {
259
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
325
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
260
329
return -1;
261
330
}
262
331
263
332
if (debug){
333
/* "Use a log level over 10 to enable all debugging options."
334
* - GnuTLS manual
335
*/
264
336
gnutls_global_set_log_level(11);
265
337
gnutls_global_set_log_function(debuggnutls);
266
338
}
267
339
268
/* openpgp credentials */
269
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
270
!= GNUTLS_E_SUCCESS) {
271
fprintf (stderr, "memory error: %s\n",
340
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
272
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
273
346
return -1;
274
347
}
275
348
276
349
if(debug){
277
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
278
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
279
KEYFILE);
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
280
353
}
281
354
282
355
ret = gnutls_certificate_set_openpgp_key_file
283
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
284
357
if (ret != GNUTLS_E_SUCCESS) {
285
fprintf
286
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
287
" '%s')\n",
288
ret, CERTFILE, KEYFILE);
289
fprintf(stdout, "The Error is: %s\n",
358
fprintf(stderr,
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
290
362
safer_gnutls_strerror(ret));
291
return -1;
292
}
293
294
//GnuTLS server initialization
295
if ((ret = gnutls_dh_params_init (&es->dh_params))
296
!= GNUTLS_E_SUCCESS) {
297
fprintf (stderr, "Error in dh parameter initialization: %s\n",
298
safer_gnutls_strerror(ret));
299
return -1;
300
}
301
302
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in prime generation: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
310
311
// GnuTLS session creation
312
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
313
!= GNUTLS_E_SUCCESS){
363
goto globalfail;
364
}
365
366
/* GnuTLS server initialization */
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
382
return 0;
383
384
globalfail:
385
386
gnutls_certificate_free_credentials(mc->cred);
387
gnutls_global_deinit();
388
return -1;
389
390
}
391
392
static int init_gnutls_session(mandos_context *mc,
393
gnutls_session_t *session){
394
int ret;
395
/* GnuTLS session creation */
396
ret = gnutls_init(session, GNUTLS_SERVER);
397
if (ret != GNUTLS_E_SUCCESS){
314
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
315
399
safer_gnutls_strerror(ret));
316
400
}
317
401
318
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf(stderr, "Syntax error at: %s\n", err);
321
fprintf(stderr, "GnuTLS error: %s\n",
322
safer_gnutls_strerror(ret));
323
return -1;
402
{
403
const char *err;
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
406
fprintf(stderr, "Syntax error at: %s\n", err);
407
fprintf(stderr, "GnuTLS error: %s\n",
408
safer_gnutls_strerror(ret));
409
gnutls_deinit (*session);
410
return -1;
411
}
324
412
}
325
413
326
if ((ret = gnutls_credentials_set
327
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Error setting a credentials set: %s\n",
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
415
mc->cred);
416
if (ret != GNUTLS_E_SUCCESS) {
417
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
330
418
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
331
420
return -1;
332
421
}
333
422
334
423
/* ignore client certificate if any. */
335
gnutls_certificate_server_set_request (es->session,
424
gnutls_certificate_server_set_request (*session,
336
425
GNUTLS_CERT_IGNORE);
337
426
338
gnutls_dh_set_prime_bits (es->session, DH_BITS);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
339
428
340
429
return 0;
341
430
}
342
431
343
void empty_log(__attribute__((unused)) AvahiLogLevel level,
344
__attribute__((unused)) const char *txt){}
432
/* Avahi log function callback */
433
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
434
__attribute__((unused)) const char *txt){}
345
435
346
int start_mandos_communication(const char *ip, uint16_t port,
347
unsigned int if_index){
436
/* Called when a Mandos server is found */
437
static int start_mandos_communication(const char *ip, uint16_t port,
438
AvahiIfIndex if_index,
439
mandos_context *mc){
348
440
int ret, tcp_sd;
349
struct sockaddr_in6 to;
350
encrypted_session es;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
351
442
char *buffer = NULL;
352
443
char *decrypted_buffer;
353
444
size_t buffer_length = 0;
354
445
size_t buffer_capacity = 0;
355
446
ssize_t decrypted_buffer_size;
356
size_t written = 0;
447
size_t written;
357
448
int retval = 0;
358
449
char interface[IF_NAMESIZE];
450
gnutls_session_t session;
451
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
454
return -1;
455
}
359
456
360
457
if(debug){
361
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
459
ip, port);
362
460
}
363
461
364
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
366
464
perror("socket");
367
465
return -1;
368
466
}
369
370
if(if_indextoname(if_index, interface) == NULL){
371
if(debug){
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
372
470
perror("if_indextoname");
471
return -1;
373
472
}
374
return -1;
375
}
376
377
if(debug){
378
473
fprintf(stderr, "Binding to interface %s\n", interface);
379
474
}
380
475
381
476
memset(&to,0,sizeof(to)); /* Spurious warning */
382
to.sin6_family = AF_INET6;
383
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
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);
384
481
if (ret < 0 ){
385
482
perror("inet_pton");
386
483
return -1;
387
}
484
}
388
485
if(ret == 0){
389
486
fprintf(stderr, "Bad address: %s\n", ip);
390
487
return -1;
391
488
}
392
to.sin6_port = htons(port); /* Spurious warning */
489
to.in6.sin6_port = htons(port); /* Spurious warning */
393
490
394
to.sin6_scope_id = (uint32_t)if_index;
491
to.in6.sin6_scope_id = (uint32_t)if_index;
395
492
396
493
if(debug){
397
fprintf(stderr, "Connection to: %s\n", ip);
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){
498
perror("inet_ntop");
499
} else {
500
if(strcmp(addrstr, ip) != 0){
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
502
}
503
}
398
504
}
399
505
400
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
506
ret = connect(tcp_sd, &to.in, sizeof(to));
401
507
if (ret < 0){
402
508
perror("connect");
403
509
return -1;
404
510
}
405
406
ret = initgnutls (&es);
407
if (ret != 0){
408
retval = -1;
409
return -1;
511
512
const char *out = mandos_protocol_version;
513
written = 0;
514
while (true){
515
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
518
if (ret == -1){
519
perror("write");
520
retval = -1;
521
goto mandos_end;
522
}
523
written += (size_t)ret;
524
if(written < out_size){
525
continue;
526
} else {
527
if (out == mandos_protocol_version){
528
written = 0;
529
out = "\r\n";
530
} else {
531
break;
532
}
533
}
410
534
}
411
412
gnutls_transport_set_ptr (es.session,
413
(gnutls_transport_ptr_t) tcp_sd);
414
535
415
536
if(debug){
416
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
417
538
}
418
539
419
ret = gnutls_handshake (es.session);
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
420
545
421
546
if (ret != GNUTLS_E_SUCCESS){
422
547
if(debug){
423
fprintf(stderr, "\n*** Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
424
549
gnutls_perror (ret);
425
550
}
426
551
retval = -1;
427
goto exit;
552
goto mandos_end;
428
553
}
429
554
430
//Retrieve OpenPGP packet that contains the wanted password
555
/* Read OpenPGP packet that contains the wanted password */
431
556
432
557
if(debug){
433
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
435
560
}
436
561
437
562
while(true){
438
if (buffer_length + BUFFER_SIZE > buffer_capacity){
439
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
440
if (buffer == NULL){
441
perror("realloc");
442
goto exit;
443
}
444
buffer_capacity += BUFFER_SIZE;
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
564
buffer_capacity);
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
567
retval = -1;
568
goto mandos_end;
445
569
}
446
570
447
ret = gnutls_record_recv
448
(es.session, buffer+buffer_length, BUFFER_SIZE);
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
449
573
if (ret == 0){
450
574
break;
451
575
}
455
579
case GNUTLS_E_AGAIN:
456
580
break;
457
581
case GNUTLS_E_REHANDSHAKE:
458
ret = gnutls_handshake (es.session);
582
do{
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
459
585
if (ret < 0){
460
fprintf(stderr, "\n*** Handshake failed ***\n");
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
461
587
gnutls_perror (ret);
462
588
retval = -1;
463
goto exit;
589
goto mandos_end;
464
590
}
465
591
break;
466
592
default:
467
593
fprintf(stderr, "Unknown error while reading data from"
468
" encrypted session with mandos server\n");
594
" encrypted session with Mandos server\n");
469
595
retval = -1;
470
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
471
goto exit;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
597
goto mandos_end;
472
598
}
473
599
} else {
474
600
buffer_length += (size_t) ret;
475
601
}
476
602
}
477
603
604
if(debug){
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
478
610
if (buffer_length > 0){
479
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
480
612
buffer_length,
481
613
&decrypted_buffer,
482
CERT_ROOT);
614
keydir);
483
615
if (decrypted_buffer_size >= 0){
484
while(written < decrypted_buffer_size){
616
written = 0;
617
while(written < (size_t) decrypted_buffer_size){
485
618
ret = (int)fwrite (decrypted_buffer + written, 1,
486
619
(size_t)decrypted_buffer_size - written,
487
620
stdout);
500
633
retval = -1;
501
634
}
502
635
}
503
504
//shutdown procedure
505
506
if(debug){
507
fprintf(stderr, "Closing TLS session\n");
508
}
509
636
637
/* Shutdown procedure */
638
639
mandos_end:
510
640
free(buffer);
511
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
512
exit:
513
641
close(tcp_sd);
514
gnutls_deinit (es.session);
515
gnutls_certificate_free_credentials (es.cred);
516
gnutls_global_deinit ();
642
gnutls_deinit (session);
517
643
return retval;
518
644
}
519
645
520
static AvahiSimplePoll *simple_poll = NULL;
521
static AvahiServer *server = NULL;
522
523
static void resolve_callback(
524
AvahiSServiceResolver *r,
525
AvahiIfIndex interface,
526
AVAHI_GCC_UNUSED AvahiProtocol protocol,
527
AvahiResolverEvent event,
528
const char *name,
529
const char *type,
530
const char *domain,
531
const char *host_name,
532
const AvahiAddress *address,
533
uint16_t port,
534
AVAHI_GCC_UNUSED AvahiStringList *txt,
535
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
536
AVAHI_GCC_UNUSED void* userdata) {
537
646
static void resolve_callback(AvahiSServiceResolver *r,
647
AvahiIfIndex interface,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
649
AvahiResolverEvent event,
650
const char *name,
651
const char *type,
652
const char *domain,
653
const char *host_name,
654
const AvahiAddress *address,
655
uint16_t port,
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
658
flags,
659
void* userdata) {
660
mandos_context *mc = userdata;
538
661
assert(r); /* Spurious warning */
539
662
540
663
/* Called whenever a service has been resolved successfully or
543
666
switch (event) {
544
667
default:
545
668
case AVAHI_RESOLVER_FAILURE:
546
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
547
" type '%s' in domain '%s': %s\n", name, type, domain,
548
avahi_strerror(avahi_server_errno(server)));
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
671
avahi_strerror(avahi_server_errno(mc->server)));
549
672
break;
550
673
551
674
case AVAHI_RESOLVER_FOUND:
553
676
char ip[AVAHI_ADDRESS_STR_MAX];
554
677
avahi_address_snprint(ip, sizeof(ip), address);
555
678
if(debug){
556
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
557
" port %d\n", name, host_name, ip, port);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
558
681
}
559
int ret = start_mandos_communication(ip, port,
560
(unsigned int) interface);
682
int ret = start_mandos_communication(ip, port, interface, mc);
561
683
if (ret == 0){
562
684
exit(EXIT_SUCCESS);
563
685
}
566
688
avahi_s_service_resolver_free(r);
567
689
}
568
690
569
static void browse_callback(
570
AvahiSServiceBrowser *b,
571
AvahiIfIndex interface,
572
AvahiProtocol protocol,
573
AvahiBrowserEvent event,
574
const char *name,
575
const char *type,
576
const char *domain,
577
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
578
void* userdata) {
579
580
AvahiServer *s = userdata;
581
assert(b); /* Spurious warning */
582
583
/* Called whenever a new services becomes available on the LAN or
584
is removed from the LAN */
585
586
switch (event) {
587
default:
588
case AVAHI_BROWSER_FAILURE:
589
590
fprintf(stderr, "(Browser) %s\n",
591
avahi_strerror(avahi_server_errno(server)));
592
avahi_simple_poll_quit(simple_poll);
593
return;
594
595
case AVAHI_BROWSER_NEW:
596
/* We ignore the returned resolver object. In the callback
597
function we free it. If the server is terminated before
598
the callback function is called the server will free
599
the resolver for us. */
600
601
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
602
type, domain,
603
AVAHI_PROTO_INET6, 0,
604
resolve_callback, s)))
605
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
606
avahi_strerror(avahi_server_errno(s)));
607
break;
608
609
case AVAHI_BROWSER_REMOVE:
610
break;
611
612
case AVAHI_BROWSER_ALL_FOR_NOW:
613
case AVAHI_BROWSER_CACHE_EXHAUSTED:
614
break;
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 */
703
704
/* Called whenever a new services becomes available on the LAN or
705
is removed from the LAN */
706
707
switch (event) {
708
default:
709
case AVAHI_BROWSER_FAILURE:
710
711
fprintf(stderr, "(Avahi browser) %s\n",
712
avahi_strerror(avahi_server_errno(mc->server)));
713
avahi_simple_poll_quit(mc->simple_poll);
714
return;
715
716
case AVAHI_BROWSER_NEW:
717
/* We ignore the returned Avahi resolver object. In the callback
718
function we free it. If the Avahi server is terminated before
719
the callback function is called the Avahi server will free the
720
resolver for us. */
721
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
723
protocol, name, type, domain,
724
AVAHI_PROTO_INET6, 0,
725
resolve_callback, mc)))
726
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
727
name, avahi_strerror(avahi_server_errno(mc->server)));
728
break;
729
730
case AVAHI_BROWSER_REMOVE:
731
break;
732
733
case AVAHI_BROWSER_ALL_FOR_NOW:
734
case AVAHI_BROWSER_CACHE_EXHAUSTED:
735
if(debug){
736
fprintf(stderr, "No Mandos server found, still searching...\n");
615
737
}
616
}
617
618
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
619
AvahiServerConfig config;
738
break;
739
}
740
}
741
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;
760
}
761
762
763
int main(int argc, char *argv[]){
620
764
AvahiSServiceBrowser *sb = NULL;
621
765
int error;
622
766
int ret;
623
int returncode = EXIT_SUCCESS;
767
int exitcode = EXIT_SUCCESS;
624
768
const char *interface = "eth0";
625
626
while (true){
627
static struct option long_options[] = {
628
{"debug", no_argument, (int *)&debug, 1},
629
{"interface", required_argument, 0, 'i'},
630
{0, 0, 0, 0} };
631
632
int option_index = 0;
633
ret = getopt_long (argc, argv, "i:", long_options,
634
&option_index);
635
636
if (ret == -1){
637
break;
638
}
639
640
switch(ret){
641
case 0:
642
break;
643
case 'i':
644
interface = optarg;
645
break;
646
default:
647
exit(EXIT_FAILURE);
648
}
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");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
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
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
908
if(if_index == 0){
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
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);
649
965
}
650
966
651
967
if (not debug){
652
968
avahi_set_log_function(empty_log);
653
969
}
654
970
655
/* Initialize the psuedo-RNG */
971
/* Initialize the pseudo-RNG for Avahi */
656
972
srand((unsigned int) time(NULL));
657
658
/* Allocate main loop object */
659
if (!(simple_poll = avahi_simple_poll_new())) {
660
fprintf(stderr, "Failed to create simple poll object.\n");
661
662
goto exit;
663
}
664
665
/* Do not publish any local records */
666
avahi_server_config_init(&config);
667
config.publish_hinfo = 0;
668
config.publish_addresses = 0;
669
config.publish_workstation = 0;
670
config.publish_domain = 0;
671
672
/* Allocate a new server */
673
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
674
&config, NULL, NULL, &error);
675
676
/* Free the configuration data */
677
avahi_server_config_free(&config);
678
679
/* Check if creating the server object succeeded */
680
if (!server) {
681
fprintf(stderr, "Failed to create server: %s\n",
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",
682
1004
avahi_strerror(error));
683
returncode = EXIT_FAILURE;
684
goto exit;
1005
exitcode = EXIT_FAILURE;
1006
goto end;
685
1007
}
686
1008
687
/* Create the service browser */
688
sb = avahi_s_service_browser_new(server,
689
(AvahiIfIndex)
690
if_nametoindex(interface),
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
691
1011
AVAHI_PROTO_INET6,
692
1012
"_mandos._tcp", NULL, 0,
693
browse_callback, server);
694
if (!sb) {
1013
browse_callback, &mc);
1014
if (sb == NULL) {
695
1015
fprintf(stderr, "Failed to create service browser: %s\n",
696
avahi_strerror(avahi_server_errno(server)));
697
returncode = EXIT_FAILURE;
698
goto exit;
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
699
1019
}
700
1020
701
1021
/* Run the main loop */
702
1022
703
1023
if (debug){
704
fprintf(stderr, "Starting avahi loop search\n");
1024
fprintf(stderr, "Starting Avahi loop search\n");
705
1025
}
706
1026
707
avahi_simple_poll_loop(simple_poll);
1027
avahi_simple_poll_loop(mc.simple_poll);
708
1028
709
exit:
1029
end:
710
1030
711
1031
if (debug){
712
1032
fprintf(stderr, "%s exiting\n", argv[0]);
713
1033
}
714
1034
715
1035
/* Cleanup things */
716
if (sb)
1036
if (sb != NULL)
717
1037
avahi_s_service_browser_free(sb);
718
1038
719
if (server)
720
avahi_server_free(server);
721
722
if (simple_poll)
723
avahi_simple_poll_free(simple_poll);
724
725
return returncode;
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;
726
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0