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- Committer: Teddy Hogeborn
- Date: 2008-07-31 19:48:05 UTC
- Revision ID: teddy@fukt.bsnet.se-20080731194805-mseis21dxwrdfqhk
* plugins.d/mandosclient.c (start_mandos_communication): Changed
"if_index" to
be of type
"AvahiIfIndex".
All callers
changed.
(main): Add default values to "interface" and "if_index". Only
change if_index from default if "interface" was given.
* server.py (IPv6_TCPServer.server_bind): Bug fix: test if interface
is empty, not if equal to
avahi.IF_UNSPEC.
(if_nametoindex): Bug fix; typo: assign to _func[0], not func[0].
(main): Bug fix: Do not set service.interface unless the interface
setting has been given.
"if_index" to
be of type
"AvahiIfIndex".
All callers
changed.
(main): Add default values to "interface" and "if_index". Only
change if_index from default if "interface" was given.
* server.py (IPv6_TCPServer.server_bind): Bug fix: test if interface
is empty, not if equal to
avahi.IF_UNSPEC.
(if_nametoindex): Bug fix; typo: assign to _func[0], not func[0].
(main): Bug fix: Do not set service.interface unless the interface
setting has been given.
- files added:
- ca.pem
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
25
25
* along with this program. If not, see
26
26
* <http://www.gnu.org/licenses/>.
27
27
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
36
#include <stdio.h>
38
37
#include <assert.h>
39
38
#include <stdlib.h>
40
39
#include <time.h>
41
40
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
41
47
42
#include <avahi-core/core.h>
48
43
#include <avahi-core/lookup.h>
51
46
#include <avahi-common/malloc.h>
52
47
#include <avahi-common/error.h>
53
48
54
/* Mandos client part */
49
//mandos client part
55
50
#include <sys/types.h> /* socket(), inet_pton() */
56
51
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
52
struct in6_addr, inet_pton() */
64
59
#include <string.h> /* memset */
65
60
#include <arpa/inet.h> /* inet_pton() */
66
61
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
/* GPGME */
62
63
// gpgme
72
64
#include <errno.h> /* perror() */
73
65
#include <gpgme.h>
74
66
67
// getopt long
68
#include <getopt.h>
69
70
#ifndef CERT_ROOT
71
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
72
#endif
73
#define CERTFILE CERT_ROOT "openpgp-client.txt"
74
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
75
75
#define BUFFER_SIZE 256
76
#define DH_BITS 1024
76
77
77
78
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char mandos_protocol_version[] = "1";
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
79
83
/* Used for passing in values through the Avahi callback functions */
84
80
typedef struct {
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
81
gnutls_session_t session;
87
82
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
89
83
gnutls_dh_params_t dh_params;
90
const char *priority;
91
} mandos_context;
92
93
/*
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
96
* "buffer_length" is how much is already used.
97
*/
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
102
if (buffer == NULL){
103
return 0;
104
}
105
buffer_capacity += BUFFER_SIZE;
106
}
107
return buffer_capacity;
108
}
109
110
/*
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
113
*/
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
84
} encrypted_session;
85
86
87
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet, const char *homedir){
118
89
gpgme_data_t dh_crypto, dh_plain;
119
90
gpgme_ctx_t ctx;
120
91
gpgme_error_t rc;
121
92
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
124
95
gpgme_engine_info_t engine_info;
125
96
126
97
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
128
99
}
129
100
130
101
/* Init GPGME */
131
102
gpgme_check_version(NULL);
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
137
}
103
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
138
104
139
/* Set GPGME home directory for the OpenPGP engine only */
105
/* Set GPGME home directory */
140
106
rc = gpgme_get_engine_info (&engine_info);
141
107
if (rc != GPG_ERR_NO_ERROR){
142
108
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
152
118
engine_info = engine_info->next;
153
119
}
154
120
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
121
fprintf(stderr, "Could not set home dir to %s\n", homedir);
156
122
return -1;
157
123
}
158
124
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
125
/* Create new GPGME data buffer from packet buffer */
126
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
162
127
if (rc != GPG_ERR_NO_ERROR){
163
128
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
129
gpgme_strsource(rc), gpgme_strerror(rc));
170
135
if (rc != GPG_ERR_NO_ERROR){
171
136
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
137
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
174
138
return -1;
175
139
}
176
140
179
143
if (rc != GPG_ERR_NO_ERROR){
180
144
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
145
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
146
return -1;
184
147
}
185
148
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
149
/* Decrypt data from the FILE pointer to the plaintext data
150
buffer */
188
151
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
152
if (rc != GPG_ERR_NO_ERROR){
190
153
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
154
gpgme_strsource(rc), gpgme_strerror(rc));
192
plaintext_length = -1;
193
goto decrypt_end;
155
return -1;
194
156
}
195
157
196
158
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
159
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
198
160
}
199
161
200
162
if (debug){
201
163
gpgme_decrypt_result_t result;
202
164
result = gpgme_op_decrypt_result(ctx);
226
188
}
227
189
}
228
190
191
/* Delete the GPGME FILE pointer cryptotext data buffer */
192
gpgme_data_release(dh_crypto);
193
229
194
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
}
235
236
*plaintext = NULL;
195
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
196
197
*new_packet = 0;
237
198
while(true){
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
240
plaintext_capacity);
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
244
goto decrypt_end;
199
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
200
*new_packet = realloc(*new_packet,
201
(unsigned int)new_packet_capacity
202
+ BUFFER_SIZE);
203
if (*new_packet == NULL){
204
perror("realloc");
205
return -1;
206
}
207
new_packet_capacity += BUFFER_SIZE;
245
208
}
246
209
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
210
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
248
211
BUFFER_SIZE);
249
212
/* Print the data, if any */
250
213
if (ret == 0){
251
/* EOF */
252
214
break;
253
215
}
254
216
if(ret < 0){
255
217
perror("gpgme_data_read");
256
plaintext_length = -1;
257
goto decrypt_end;
218
return -1;
258
219
}
259
plaintext_length += ret;
220
new_packet_length += ret;
260
221
}
261
222
262
if(debug){
263
fprintf(stderr, "Decrypted password is: ");
264
for(ssize_t i = 0; i < plaintext_length; i++){
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
266
}
267
fprintf(stderr, "\n");
268
}
269
270
decrypt_end:
271
272
/* Delete the GPGME cryptotext data buffer */
273
gpgme_data_release(dh_crypto);
223
/* FIXME: check characters before printing to screen so to not print
224
terminal control characters */
225
/* if(debug){ */
226
/* fprintf(stderr, "decrypted password is: "); */
227
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
228
/* fprintf(stderr, "\n"); */
229
/* } */
274
230
275
231
/* Delete the GPGME plaintext data buffer */
276
232
gpgme_data_release(dh_plain);
277
return plaintext_length;
233
return new_packet_length;
278
234
}
279
235
280
236
static const char * safer_gnutls_strerror (int value) {
284
240
return ret;
285
241
}
286
242
287
/* GnuTLS log function callback */
288
static void debuggnutls(__attribute__((unused)) int level,
289
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
243
void debuggnutls(__attribute__((unused)) int level,
244
const char* string){
245
fprintf(stderr, "%s", string);
291
246
}
292
247
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
248
int initgnutls(encrypted_session *es){
249
const char *err;
296
250
int ret;
297
251
298
252
if(debug){
299
253
fprintf(stderr, "Initializing GnuTLS\n");
300
254
}
301
255
302
256
if ((ret = gnutls_global_init ())
303
257
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
258
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
306
259
return -1;
307
260
}
308
261
309
262
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
313
263
gnutls_global_set_log_level(11);
314
264
gnutls_global_set_log_function(debuggnutls);
315
265
}
316
266
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
267
/* openpgp credentials */
268
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
319
269
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
270
fprintf (stderr, "memory error: %s\n",
321
271
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
323
272
return -1;
324
273
}
325
274
326
275
if(debug){
327
276
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
277
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
278
KEYFILE);
330
279
}
331
280
332
281
ret = gnutls_certificate_set_openpgp_key_file
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
282
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
334
283
if (ret != GNUTLS_E_SUCCESS) {
335
fprintf(stderr,
336
"Error[%d] while reading the OpenPGP key pair ('%s',"
337
" '%s')\n", ret, pubkeyfile, seckeyfile);
338
fprintf(stdout, "The GnuTLS error is: %s\n",
284
fprintf
285
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
286
" '%s')\n",
287
ret, CERTFILE, KEYFILE);
288
fprintf(stdout, "The Error is: %s\n",
339
289
safer_gnutls_strerror(ret));
340
goto globalfail;
341
}
342
343
/* GnuTLS server initialization */
344
ret = gnutls_dh_params_init(&mc->dh_params);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
347
" %s\n", safer_gnutls_strerror(ret));
348
goto globalfail;
349
}
350
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
351
if (ret != GNUTLS_E_SUCCESS) {
352
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
353
safer_gnutls_strerror(ret));
354
goto globalfail;
355
}
356
357
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
358
359
return 0;
360
361
globalfail:
362
363
gnutls_certificate_free_credentials (mc->cred);
364
gnutls_global_deinit ();
365
return -1;
366
367
}
368
369
static int init_gnutls_session(mandos_context *mc,
370
gnutls_session_t *session){
371
int ret;
372
/* GnuTLS session creation */
373
ret = gnutls_init(session, GNUTLS_SERVER);
374
if (ret != GNUTLS_E_SUCCESS){
290
return -1;
291
}
292
293
//GnuTLS server initialization
294
if ((ret = gnutls_dh_params_init (&es->dh_params))
295
!= GNUTLS_E_SUCCESS) {
296
fprintf (stderr, "Error in dh parameter initialization: %s\n",
297
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "Error in prime generation: %s\n",
304
safer_gnutls_strerror(ret));
305
return -1;
306
}
307
308
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
309
310
// GnuTLS session creation
311
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
312
!= GNUTLS_E_SUCCESS){
375
313
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
376
314
safer_gnutls_strerror(ret));
377
315
}
378
316
379
{
380
const char *err;
381
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Syntax error at: %s\n", err);
384
fprintf(stderr, "GnuTLS error: %s\n",
385
safer_gnutls_strerror(ret));
386
gnutls_deinit (*session);
387
return -1;
388
}
317
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
318
!= GNUTLS_E_SUCCESS) {
319
fprintf(stderr, "Syntax error at: %s\n", err);
320
fprintf(stderr, "GnuTLS error: %s\n",
321
safer_gnutls_strerror(ret));
322
return -1;
389
323
}
390
324
391
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
392
mc->cred);
393
if (ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
325
if ((ret = gnutls_credentials_set
326
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
327
!= GNUTLS_E_SUCCESS) {
328
fprintf(stderr, "Error setting a credentials set: %s\n",
395
329
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
397
330
return -1;
398
331
}
399
332
400
333
/* ignore client certificate if any. */
401
gnutls_certificate_server_set_request (*session,
334
gnutls_certificate_server_set_request (es->session,
402
335
GNUTLS_CERT_IGNORE);
403
336
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
337
gnutls_dh_set_prime_bits (es->session, DH_BITS);
405
338
406
339
return 0;
407
340
}
408
341
409
/* Avahi log function callback */
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
__attribute__((unused)) const char *txt){}
342
void empty_log(__attribute__((unused)) AvahiLogLevel level,
343
__attribute__((unused)) const char *txt){}
412
344
413
/* Called when a Mandos server is found */
414
static int start_mandos_communication(const char *ip, uint16_t port,
415
AvahiIfIndex if_index,
416
mandos_context *mc){
345
int start_mandos_communication(const char *ip, uint16_t port,
346
AvahiIfIndex if_index){
417
347
int ret, tcp_sd;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
348
struct sockaddr_in6 to;
349
encrypted_session es;
419
350
char *buffer = NULL;
420
351
char *decrypted_buffer;
421
352
size_t buffer_length = 0;
422
353
size_t buffer_capacity = 0;
423
354
ssize_t decrypted_buffer_size;
424
size_t written;
355
size_t written = 0;
425
356
int retval = 0;
426
357
char interface[IF_NAMESIZE];
427
gnutls_session_t session;
428
429
ret = init_gnutls_session (mc, &session);
430
if (ret != 0){
431
return -1;
432
}
433
358
434
359
if(debug){
435
360
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
441
366
perror("socket");
442
367
return -1;
443
368
}
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
369
370
if(if_indextoname((unsigned int)if_index, interface) == NULL){
371
if(debug){
447
372
perror("if_indextoname");
448
return -1;
449
373
}
374
return -1;
375
}
376
377
if(debug){
450
378
fprintf(stderr, "Binding to interface %s\n", interface);
451
379
}
452
380
453
381
memset(&to,0,sizeof(to)); /* Spurious warning */
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
382
to.sin6_family = AF_INET6;
383
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
458
384
if (ret < 0 ){
459
385
perror("inet_pton");
460
386
return -1;
461
}
387
}
462
388
if(ret == 0){
463
389
fprintf(stderr, "Bad address: %s\n", ip);
464
390
return -1;
465
391
}
466
to.in6.sin6_port = htons(port); /* Spurious warning */
392
to.sin6_port = htons(port); /* Spurious warning */
467
393
468
to.in6.sin6_scope_id = (uint32_t)if_index;
394
to.sin6_scope_id = (uint32_t)if_index;
469
395
470
396
if(debug){
471
397
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
475
perror("inet_ntop");
476
} else {
477
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
479
}
480
}
398
/* char addrstr[INET6_ADDRSTRLEN]; */
399
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
400
/* sizeof(addrstr)) == NULL){ */
401
/* perror("inet_ntop"); */
402
/* } else { */
403
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
404
/* addrstr, ntohs(to.sin6_port)); */
405
/* } */
481
406
}
482
407
483
ret = connect(tcp_sd, &to.in, sizeof(to));
408
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
484
409
if (ret < 0){
485
410
perror("connect");
486
411
return -1;
487
412
}
488
489
const char *out = mandos_protocol_version;
490
written = 0;
491
while (true){
492
size_t out_size = strlen(out);
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
494
out_size - written));
495
if (ret == -1){
496
perror("write");
497
retval = -1;
498
goto mandos_end;
499
}
500
written += (size_t)ret;
501
if(written < out_size){
502
continue;
503
} else {
504
if (out == mandos_protocol_version){
505
written = 0;
506
out = "\r\n";
507
} else {
508
break;
509
}
510
}
413
414
ret = initgnutls (&es);
415
if (ret != 0){
416
retval = -1;
417
return -1;
511
418
}
512
419
420
gnutls_transport_set_ptr (es.session,
421
(gnutls_transport_ptr_t) tcp_sd);
422
513
423
if(debug){
514
424
fprintf(stderr, "Establishing TLS session with %s\n", ip);
515
425
}
516
426
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
427
ret = gnutls_handshake (es.session);
520
428
521
429
if (ret != GNUTLS_E_SUCCESS){
522
430
if(debug){
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
431
fprintf(stderr, "\n*** Handshake failed ***\n");
524
432
gnutls_perror (ret);
525
433
}
526
434
retval = -1;
527
goto mandos_end;
435
goto exit;
528
436
}
529
437
530
/* Read OpenPGP packet that contains the wanted password */
438
//Retrieve OpenPGP packet that contains the wanted password
531
439
532
440
if(debug){
533
441
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
535
443
}
536
444
537
445
while(true){
538
buffer_capacity = adjustbuffer(&buffer, buffer_length,
539
buffer_capacity);
540
if (buffer_capacity == 0){
541
perror("adjustbuffer");
542
retval = -1;
543
goto mandos_end;
446
if (buffer_length + BUFFER_SIZE > buffer_capacity){
447
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
448
if (buffer == NULL){
449
perror("realloc");
450
goto exit;
451
}
452
buffer_capacity += BUFFER_SIZE;
544
453
}
545
454
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
455
ret = gnutls_record_recv
456
(es.session, buffer+buffer_length, BUFFER_SIZE);
548
457
if (ret == 0){
549
458
break;
550
459
}
554
463
case GNUTLS_E_AGAIN:
555
464
break;
556
465
case GNUTLS_E_REHANDSHAKE:
557
ret = gnutls_handshake (session);
466
ret = gnutls_handshake (es.session);
558
467
if (ret < 0){
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
468
fprintf(stderr, "\n*** Handshake failed ***\n");
560
469
gnutls_perror (ret);
561
470
retval = -1;
562
goto mandos_end;
471
goto exit;
563
472
}
564
473
break;
565
474
default:
566
475
fprintf(stderr, "Unknown error while reading data from"
567
" encrypted session with Mandos server\n");
476
" encrypted session with mandos server\n");
568
477
retval = -1;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
478
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
479
goto exit;
571
480
}
572
481
} else {
573
482
buffer_length += (size_t) ret;
574
483
}
575
484
}
576
485
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
583
486
if (buffer_length > 0){
584
487
decrypted_buffer_size = pgp_packet_decrypt(buffer,
585
488
buffer_length,
586
489
&decrypted_buffer,
587
keydir);
490
CERT_ROOT);
588
491
if (decrypted_buffer_size >= 0){
589
written = 0;
590
492
while(written < (size_t) decrypted_buffer_size){
591
493
ret = (int)fwrite (decrypted_buffer + written, 1,
592
494
(size_t)decrypted_buffer_size - written,
606
508
retval = -1;
607
509
}
608
510
}
609
610
/* Shutdown procedure */
611
612
mandos_end:
511
512
//shutdown procedure
513
514
if(debug){
515
fprintf(stderr, "Closing TLS session\n");
516
}
517
613
518
free(buffer);
519
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
520
exit:
614
521
close(tcp_sd);
615
gnutls_deinit (session);
522
gnutls_deinit (es.session);
523
gnutls_certificate_free_credentials (es.cred);
524
gnutls_global_deinit ();
616
525
return retval;
617
526
}
618
527
619
static void resolve_callback(AvahiSServiceResolver *r,
620
AvahiIfIndex interface,
621
AVAHI_GCC_UNUSED AvahiProtocol protocol,
622
AvahiResolverEvent event,
623
const char *name,
624
const char *type,
625
const char *domain,
626
const char *host_name,
627
const AvahiAddress *address,
628
uint16_t port,
629
AVAHI_GCC_UNUSED AvahiStringList *txt,
630
AVAHI_GCC_UNUSED AvahiLookupResultFlags
631
flags,
632
void* userdata) {
633
mandos_context *mc = userdata;
528
static AvahiSimplePoll *simple_poll = NULL;
529
static AvahiServer *server = NULL;
530
531
static void resolve_callback(
532
AvahiSServiceResolver *r,
533
AvahiIfIndex interface,
534
AVAHI_GCC_UNUSED AvahiProtocol protocol,
535
AvahiResolverEvent event,
536
const char *name,
537
const char *type,
538
const char *domain,
539
const char *host_name,
540
const AvahiAddress *address,
541
uint16_t port,
542
AVAHI_GCC_UNUSED AvahiStringList *txt,
543
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
544
AVAHI_GCC_UNUSED void* userdata) {
545
634
546
assert(r); /* Spurious warning */
635
547
636
548
/* Called whenever a service has been resolved successfully or
639
551
switch (event) {
640
552
default:
641
553
case AVAHI_RESOLVER_FAILURE:
642
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
643
" of type '%s' in domain '%s': %s\n", name, type, domain,
644
avahi_strerror(avahi_server_errno(mc->server)));
554
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
555
" type '%s' in domain '%s': %s\n", name, type, domain,
556
avahi_strerror(avahi_server_errno(server)));
645
557
break;
646
558
647
559
case AVAHI_RESOLVER_FOUND:
649
561
char ip[AVAHI_ADDRESS_STR_MAX];
650
562
avahi_address_snprint(ip, sizeof(ip), address);
651
563
if(debug){
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
564
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
565
" port %d\n", name, host_name, ip, port);
654
566
}
655
int ret = start_mandos_communication(ip, port, interface, mc);
567
int ret = start_mandos_communication(ip, port, interface);
656
568
if (ret == 0){
657
569
exit(EXIT_SUCCESS);
658
570
}
661
573
avahi_s_service_resolver_free(r);
662
574
}
663
575
664
static void browse_callback( AvahiSServiceBrowser *b,
665
AvahiIfIndex interface,
666
AvahiProtocol protocol,
667
AvahiBrowserEvent event,
668
const char *name,
669
const char *type,
670
const char *domain,
671
AVAHI_GCC_UNUSED AvahiLookupResultFlags
672
flags,
673
void* userdata) {
674
mandos_context *mc = userdata;
675
assert(b); /* Spurious warning */
676
677
/* Called whenever a new services becomes available on the LAN or
678
is removed from the LAN */
679
680
switch (event) {
681
default:
682
case AVAHI_BROWSER_FAILURE:
683
684
fprintf(stderr, "(Avahi browser) %s\n",
685
avahi_strerror(avahi_server_errno(mc->server)));
686
avahi_simple_poll_quit(mc->simple_poll);
687
return;
688
689
case AVAHI_BROWSER_NEW:
690
/* We ignore the returned Avahi resolver object. In the callback
691
function we free it. If the Avahi server is terminated before
692
the callback function is called the Avahi server will free the
693
resolver for us. */
694
695
if (!(avahi_s_service_resolver_new(mc->server, interface,
696
protocol, name, type, domain,
697
AVAHI_PROTO_INET6, 0,
698
resolve_callback, mc)))
699
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
700
name, avahi_strerror(avahi_server_errno(mc->server)));
701
break;
702
703
case AVAHI_BROWSER_REMOVE:
704
break;
705
706
case AVAHI_BROWSER_ALL_FOR_NOW:
707
case AVAHI_BROWSER_CACHE_EXHAUSTED:
708
if(debug){
709
fprintf(stderr, "No Mandos server found, still searching...\n");
576
static void browse_callback(
577
AvahiSServiceBrowser *b,
578
AvahiIfIndex interface,
579
AvahiProtocol protocol,
580
AvahiBrowserEvent event,
581
const char *name,
582
const char *type,
583
const char *domain,
584
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
585
void* userdata) {
586
587
AvahiServer *s = userdata;
588
assert(b); /* Spurious warning */
589
590
/* Called whenever a new services becomes available on the LAN or
591
is removed from the LAN */
592
593
switch (event) {
594
default:
595
case AVAHI_BROWSER_FAILURE:
596
597
fprintf(stderr, "(Browser) %s\n",
598
avahi_strerror(avahi_server_errno(server)));
599
avahi_simple_poll_quit(simple_poll);
600
return;
601
602
case AVAHI_BROWSER_NEW:
603
/* We ignore the returned resolver object. In the callback
604
function we free it. If the server is terminated before
605
the callback function is called the server will free
606
the resolver for us. */
607
608
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
609
type, domain,
610
AVAHI_PROTO_INET6, 0,
611
resolve_callback, s)))
612
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
613
avahi_strerror(avahi_server_errno(s)));
614
break;
615
616
case AVAHI_BROWSER_REMOVE:
617
break;
618
619
case AVAHI_BROWSER_ALL_FOR_NOW:
620
case AVAHI_BROWSER_CACHE_EXHAUSTED:
621
break;
710
622
}
711
break;
712
}
713
}
714
715
/* Combines file name and path and returns the malloced new
716
string. some sane checks could/should be added */
717
static const char *combinepath(const char *first, const char *second){
718
size_t f_len = strlen(first);
719
size_t s_len = strlen(second);
720
char *tmp = malloc(f_len + s_len + 2);
721
if (tmp == NULL){
722
return NULL;
723
}
724
if(f_len > 0){
725
memcpy(tmp, first, f_len); /* Spurious warning */
726
}
727
tmp[f_len] = '/';
728
if(s_len > 0){
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
730
}
731
tmp[f_len + 1 + s_len] = '\0';
732
return tmp;
733
}
734
735
736
int main(int argc, char *argv[]){
623
}
624
625
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
626
AvahiServerConfig config;
737
627
AvahiSServiceBrowser *sb = NULL;
738
628
int error;
739
629
int ret;
740
int exitcode = EXIT_SUCCESS;
741
const char *interface = "eth0";
742
struct ifreq network;
743
int sd;
744
uid_t uid;
745
gid_t gid;
630
int returncode = EXIT_SUCCESS;
631
const char *interface = NULL;
632
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
746
633
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
753
754
{
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
759
.arg = "IP",
760
.doc = "Connect directly to a sepcified mandos server",
761
.group = 1 },
762
{ .name = "interface", .key = 'i',
763
.arg = "INTERFACE",
764
.doc = "Interface that Avahi will conntect through",
765
.group = 1 },
766
{ .name = "keydir", .key = 'd',
767
.arg = "KEYDIR",
768
.doc = "Directory where the openpgp keyring is",
769
.group = 1 },
770
{ .name = "seckey", .key = 's',
771
.arg = "SECKEY",
772
.doc = "Secret openpgp key for gnutls authentication",
773
.group = 1 },
774
{ .name = "pubkey", .key = 'p',
775
.arg = "PUBKEY",
776
.doc = "Public openpgp key for gnutls authentication",
777
.group = 2 },
778
{ .name = "dh-bits", .key = 129,
779
.arg = "BITS",
780
.doc = "dh-bits to use in gnutls communication",
781
.group = 2 },
782
{ .name = "priority", .key = 130,
783
.arg = "PRIORITY",
784
.doc = "GNUTLS priority", .group = 1 },
785
{ .name = NULL }
786
};
787
788
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
793
switch (key) {
794
case 128:
795
debug = true;
796
break;
797
case 'c':
798
connect_to = arg;
799
break;
800
case 'i':
801
interface = arg;
802
break;
803
case 'd':
804
keydir = arg;
805
break;
806
case 's':
807
seckeyfile = arg;
808
break;
809
case 'p':
810
pubkeyfile = arg;
811
break;
812
case 129:
813
errno = 0;
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
815
if (errno){
816
perror("strtol");
817
exit(EXIT_FAILURE);
818
}
819
break;
820
case 130:
821
mc.priority = arg;
822
break;
823
case ARGP_KEY_ARG:
824
argp_usage (state);
825
break;
826
case ARGP_KEY_END:
827
break;
828
default:
829
return ARGP_ERR_UNKNOWN;
830
}
831
return 0;
832
}
833
834
struct argp argp = { .options = options, .parser = parse_opt,
835
.args_doc = "",
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
839
}
840
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
844
exitcode = EXIT_FAILURE;
845
goto end;
846
}
847
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
851
goto end;
852
}
853
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
855
if (ret == -1){
856
fprintf(stderr, "init_gnutls_global\n");
857
goto end;
858
} else {
859
gnutls_initalized = true;
860
}
861
862
uid = getuid();
863
gid = getgid();
864
865
ret = setuid(uid);
866
if (ret == -1){
867
perror("setuid");
868
}
869
870
setgid(gid);
871
if (ret == -1){
872
perror("setgid");
873
}
874
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
876
if(if_index == 0){
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
878
exit(EXIT_FAILURE);
634
635
while (true){
636
static struct option long_options[] = {
637
{"debug", no_argument, (int *)&debug, 1},
638
{"connect", required_argument, 0, 'c'},
639
{"interface", required_argument, 0, 'i'},
640
{0, 0, 0, 0} };
641
642
int option_index = 0;
643
ret = getopt_long (argc, argv, "i:", long_options,
644
&option_index);
645
646
if (ret == -1){
647
break;
648
}
649
650
switch(ret){
651
case 0:
652
break;
653
case 'i':
654
interface = optarg;
655
break;
656
case 'c':
657
connect_to = optarg;
658
break;
659
default:
660
exit(EXIT_FAILURE);
661
}
662
}
663
664
if(interface != NULL){
665
if_index = (AvahiIfIndex) if_nametoindex(interface);
666
if(if_index == 0){
667
fprintf(stderr, "No such interface: \"%s\"\n", interface);
668
exit(EXIT_FAILURE);
669
}
879
670
}
880
671
881
672
if(connect_to != NULL){
884
675
char *address = strrchr(connect_to, ':');
885
676
if(address == NULL){
886
677
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
678
exit(EXIT_FAILURE);
889
679
}
890
680
errno = 0;
891
681
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
892
682
if(errno){
893
683
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
895
goto end;
684
exit(EXIT_FAILURE);
896
685
}
897
686
*address = '\0';
898
687
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
688
ret = start_mandos_communication(address, port, if_index);
900
689
if(ret < 0){
901
exitcode = EXIT_FAILURE;
690
exit(EXIT_FAILURE);
902
691
} else {
903
exitcode = EXIT_SUCCESS;
904
}
905
goto end;
906
}
907
908
/* If the interface is down, bring it up */
909
{
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
911
if(sd < 0) {
912
perror("socket");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
strcpy(network.ifr_name, interface); /* Spurious warning */
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
918
if(ret == -1){
919
perror("ioctl SIOCGIFFLAGS");
920
exitcode = EXIT_FAILURE;
921
goto end;
922
}
923
if((network.ifr_flags & IFF_UP) == 0){
924
network.ifr_flags |= IFF_UP;
925
ret = ioctl(sd, SIOCSIFFLAGS, &network);
926
if(ret == -1){
927
perror("ioctl SIOCSIFFLAGS");
928
exitcode = EXIT_FAILURE;
929
goto end;
930
}
931
}
932
close(sd);
692
exit(EXIT_SUCCESS);
693
}
933
694
}
934
695
935
696
if (not debug){
936
697
avahi_set_log_function(empty_log);
937
698
}
938
699
939
/* Initialize the pseudo-RNG for Avahi */
700
/* Initialize the psuedo-RNG */
940
701
srand((unsigned int) time(NULL));
941
942
/* Allocate main Avahi loop object */
943
mc.simple_poll = avahi_simple_poll_new();
944
if (mc.simple_poll == NULL) {
945
fprintf(stderr, "Avahi: Failed to create simple poll"
946
" object.\n");
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
951
{
952
AvahiServerConfig config;
953
/* Do not publish any local Zeroconf records */
954
avahi_server_config_init(&config);
955
config.publish_hinfo = 0;
956
config.publish_addresses = 0;
957
config.publish_workstation = 0;
958
config.publish_domain = 0;
959
960
/* Allocate a new server */
961
mc.server = avahi_server_new(avahi_simple_poll_get
962
(mc.simple_poll), &config, NULL,
963
NULL, &error);
964
965
/* Free the Avahi configuration data */
966
avahi_server_config_free(&config);
967
}
968
969
/* Check if creating the Avahi server object succeeded */
970
if (mc.server == NULL) {
971
fprintf(stderr, "Failed to create Avahi server: %s\n",
702
703
/* Allocate main loop object */
704
if (!(simple_poll = avahi_simple_poll_new())) {
705
fprintf(stderr, "Failed to create simple poll object.\n");
706
707
goto exit;
708
}
709
710
/* Do not publish any local records */
711
avahi_server_config_init(&config);
712
config.publish_hinfo = 0;
713
config.publish_addresses = 0;
714
config.publish_workstation = 0;
715
config.publish_domain = 0;
716
717
/* Allocate a new server */
718
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
719
&config, NULL, NULL, &error);
720
721
/* Free the configuration data */
722
avahi_server_config_free(&config);
723
724
/* Check if creating the server object succeeded */
725
if (!server) {
726
fprintf(stderr, "Failed to create server: %s\n",
972
727
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
974
goto end;
728
returncode = EXIT_FAILURE;
729
goto exit;
975
730
}
976
731
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
732
/* Create the service browser */
733
sb = avahi_s_service_browser_new(server, if_index,
979
734
AVAHI_PROTO_INET6,
980
735
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
982
if (sb == NULL) {
736
browse_callback, server);
737
if (!sb) {
983
738
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
739
avahi_strerror(avahi_server_errno(server)));
740
returncode = EXIT_FAILURE;
741
goto exit;
987
742
}
988
743
989
744
/* Run the main loop */
990
745
991
746
if (debug){
992
fprintf(stderr, "Starting Avahi loop search\n");
747
fprintf(stderr, "Starting avahi loop search\n");
993
748
}
994
749
995
avahi_simple_poll_loop(mc.simple_poll);
750
avahi_simple_poll_loop(simple_poll);
996
751
997
end:
752
exit:
998
753
999
754
if (debug){
1000
755
fprintf(stderr, "%s exiting\n", argv[0]);
1001
756
}
1002
757
1003
758
/* Cleanup things */
1004
if (sb != NULL)
759
if (sb)
1005
760
avahi_s_service_browser_free(sb);
1006
761
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
1009
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
1012
free(pubkeyfile);
1013
free(seckeyfile);
1014
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
1018
}
1019
1020
return exitcode;
762
if (server)
763
avahi_server_free(server);
764
765
if (simple_poll)
766
avahi_simple_poll_free(simple_poll);
767
768
return returncode;
1021
769
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0