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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:
- mandos-client.xml
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- server.conf => mandos.conf
- 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
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
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>
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_* */
70
97
71
98
#define BUFFER_SIZE 256
72
99
100
bool debug = false;
73
101
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
76
77
bool debug = false;
78
79
/* Used for passing in values through all the callback functions */
102
static const char mandos_protocol_version[] = "1";
103
const char *argp_program_version = "password-request 1.0";
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
105
106
/* Used for passing in values through the Avahi callback functions */
80
107
typedef struct {
81
108
AvahiSimplePoll *simple_poll;
82
109
AvahiServer *server;
83
110
gnutls_certificate_credentials_t cred;
84
111
unsigned int dh_bits;
112
gnutls_dh_params_t dh_params;
85
113
const char *priority;
86
114
} mandos_context;
87
115
88
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet,
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,
90
140
const char *homedir){
91
141
gpgme_data_t dh_crypto, dh_plain;
92
142
gpgme_ctx_t ctx;
93
143
gpgme_error_t rc;
94
144
ssize_t ret;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
97
147
gpgme_engine_info_t engine_info;
98
148
99
149
if (debug){
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
101
151
}
102
152
103
153
/* Init GPGME */
109
159
return -1;
110
160
}
111
161
112
/* Set GPGME home directory */
162
/* Set GPGME home directory for the OpenPGP engine only */
113
163
rc = gpgme_get_engine_info (&engine_info);
114
164
if (rc != GPG_ERR_NO_ERROR){
115
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
125
175
engine_info = engine_info->next;
126
176
}
127
177
if(engine_info == NULL){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
129
179
return -1;
130
180
}
131
181
132
/* Create new GPGME data buffer from packet buffer */
133
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);
134
185
if (rc != GPG_ERR_NO_ERROR){
135
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
136
187
gpgme_strsource(rc), gpgme_strerror(rc));
142
193
if (rc != GPG_ERR_NO_ERROR){
143
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
144
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
gpgme_data_release(dh_crypto);
145
197
return -1;
146
198
}
147
199
150
202
if (rc != GPG_ERR_NO_ERROR){
151
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
152
204
gpgme_strsource(rc), gpgme_strerror(rc));
153
return -1;
205
plaintext_length = -1;
206
goto decrypt_end;
154
207
}
155
208
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
209
/* Decrypt data from the cryptotext data buffer to the plaintext
210
data buffer */
158
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
159
212
if (rc != GPG_ERR_NO_ERROR){
160
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
161
214
gpgme_strsource(rc), gpgme_strerror(rc));
162
return -1;
215
plaintext_length = -1;
216
goto decrypt_end;
163
217
}
164
218
165
219
if(debug){
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
167
221
}
168
222
169
223
if (debug){
170
224
gpgme_decrypt_result_t result;
171
225
result = gpgme_op_decrypt_result(ctx);
195
249
}
196
250
}
197
251
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
200
201
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
202
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
254
perror("pgpme_data_seek");
255
plaintext_length = -1;
256
goto decrypt_end;
204
257
}
205
258
206
*new_packet = 0;
259
*plaintext = NULL;
207
260
while(true){
208
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
209
*new_packet = realloc(*new_packet,
210
(unsigned int)new_packet_capacity
211
+ BUFFER_SIZE);
212
if (*new_packet == NULL){
213
perror("realloc");
214
return -1;
215
}
216
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;
217
268
}
218
269
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
220
271
BUFFER_SIZE);
221
272
/* Print the data, if any */
222
273
if (ret == 0){
274
/* EOF */
223
275
break;
224
276
}
225
277
if(ret < 0){
226
278
perror("gpgme_data_read");
227
return -1;
279
plaintext_length = -1;
280
goto decrypt_end;
228
281
}
229
new_packet_length += ret;
282
plaintext_length += ret;
230
283
}
231
284
232
/* FIXME: check characters before printing to screen so to not print
233
terminal control characters */
234
/* if(debug){ */
235
/* fprintf(stderr, "decrypted password is: "); */
236
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
237
/* fprintf(stderr, "\n"); */
238
/* } */
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);
239
297
240
298
/* Delete the GPGME plaintext data buffer */
241
299
gpgme_data_release(dh_plain);
242
return new_packet_length;
300
return plaintext_length;
243
301
}
244
302
245
303
static const char * safer_gnutls_strerror (int value) {
249
307
return ret;
250
308
}
251
309
310
/* GnuTLS log function callback */
252
311
static void debuggnutls(__attribute__((unused)) int level,
253
312
const char* string){
254
fprintf(stderr, "%s", string);
313
fprintf(stderr, "GnuTLS: %s", string);
255
314
}
256
315
257
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
258
gnutls_dh_params_t *dh_params){
259
const char *err;
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
260
319
int ret;
261
320
262
321
if(debug){
263
322
fprintf(stderr, "Initializing GnuTLS\n");
264
323
}
265
266
if ((ret = gnutls_global_init ())
267
!= GNUTLS_E_SUCCESS) {
268
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
324
325
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
269
329
return -1;
270
330
}
271
331
272
332
if (debug){
333
/* "Use a log level over 10 to enable all debugging options."
334
* - GnuTLS manual
335
*/
273
336
gnutls_global_set_log_level(11);
274
337
gnutls_global_set_log_function(debuggnutls);
275
338
}
276
339
277
/* openpgp credentials */
278
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
279
!= GNUTLS_E_SUCCESS) {
280
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",
281
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
282
346
return -1;
283
347
}
284
348
291
355
ret = gnutls_certificate_set_openpgp_key_file
292
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
293
357
if (ret != GNUTLS_E_SUCCESS) {
294
fprintf
295
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
296
" '%s')\n",
297
ret, pubkeyfile, seckeyfile);
298
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",
299
362
safer_gnutls_strerror(ret));
300
return -1;
301
}
302
303
//GnuTLS server initialization
304
if ((ret = gnutls_dh_params_init(dh_params))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in dh parameter initialization: %s\n",
307
safer_gnutls_strerror(ret));
308
return -1;
309
}
310
311
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
312
!= GNUTLS_E_SUCCESS) {
313
fprintf (stderr, "Error in prime generation: %s\n",
314
safer_gnutls_strerror(ret));
315
return -1;
316
}
317
318
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
319
320
// GnuTLS session creation
321
if ((ret = gnutls_init(session, GNUTLS_SERVER))
322
!= 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){
323
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
324
399
safer_gnutls_strerror(ret));
325
400
}
326
401
327
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Syntax error at: %s\n", err);
330
fprintf(stderr, "GnuTLS error: %s\n",
331
safer_gnutls_strerror(ret));
332
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
}
333
412
}
334
413
335
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
336
mc->cred))
337
!= GNUTLS_E_SUCCESS) {
338
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",
339
418
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
340
420
return -1;
341
421
}
342
422
349
429
return 0;
350
430
}
351
431
432
/* Avahi log function callback */
352
433
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
353
434
__attribute__((unused)) const char *txt){}
354
435
436
/* Called when a Mandos server is found */
355
437
static int start_mandos_communication(const char *ip, uint16_t port,
356
438
AvahiIfIndex if_index,
357
439
mandos_context *mc){
358
440
int ret, tcp_sd;
359
struct sockaddr_in6 to;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
360
442
char *buffer = NULL;
361
443
char *decrypted_buffer;
362
444
size_t buffer_length = 0;
363
445
size_t buffer_capacity = 0;
364
446
ssize_t decrypted_buffer_size;
365
size_t written = 0;
447
size_t written;
366
448
int retval = 0;
367
449
char interface[IF_NAMESIZE];
368
450
gnutls_session_t session;
369
gnutls_dh_params_t dh_params;
451
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
454
return -1;
455
}
370
456
371
457
if(debug){
372
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
388
474
}
389
475
390
476
memset(&to,0,sizeof(to)); /* Spurious warning */
391
to.sin6_family = AF_INET6;
392
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);
393
481
if (ret < 0 ){
394
482
perror("inet_pton");
395
483
return -1;
398
486
fprintf(stderr, "Bad address: %s\n", ip);
399
487
return -1;
400
488
}
401
to.sin6_port = htons(port); /* Spurious warning */
489
to.in6.sin6_port = htons(port); /* Spurious warning */
402
490
403
to.sin6_scope_id = (uint32_t)if_index;
491
to.in6.sin6_scope_id = (uint32_t)if_index;
404
492
405
493
if(debug){
406
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
407
495
char addrstr[INET6_ADDRSTRLEN] = "";
408
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
409
497
sizeof(addrstr)) == NULL){
410
498
perror("inet_ntop");
411
499
} else {
415
503
}
416
504
}
417
505
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
506
ret = connect(tcp_sd, &to.in, sizeof(to));
419
507
if (ret < 0){
420
508
perror("connect");
421
509
return -1;
422
510
}
423
424
ret = initgnutls (mc, &session, &dh_params);
425
if (ret != 0){
426
retval = -1;
427
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
}
534
}
535
536
if(debug){
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
428
538
}
429
539
430
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
431
432
if(debug){
433
fprintf(stderr, "Establishing TLS session with %s\n", ip);
434
}
435
436
ret = gnutls_handshake (session);
541
542
do{
543
ret = gnutls_handshake (session);
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
437
545
438
546
if (ret != GNUTLS_E_SUCCESS){
439
547
if(debug){
440
fprintf(stderr, "\n*** Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
441
549
gnutls_perror (ret);
442
550
}
443
551
retval = -1;
444
goto exit;
552
goto mandos_end;
445
553
}
446
554
447
//Retrieve OpenPGP packet that contains the wanted password
555
/* Read OpenPGP packet that contains the wanted password */
448
556
449
557
if(debug){
450
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
452
560
}
453
561
454
562
while(true){
455
if (buffer_length + BUFFER_SIZE > buffer_capacity){
456
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
457
if (buffer == NULL){
458
perror("realloc");
459
goto exit;
460
}
461
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;
462
569
}
463
570
464
571
ret = gnutls_record_recv(session, buffer+buffer_length,
472
579
case GNUTLS_E_AGAIN:
473
580
break;
474
581
case GNUTLS_E_REHANDSHAKE:
475
ret = gnutls_handshake (session);
582
do{
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
476
585
if (ret < 0){
477
fprintf(stderr, "\n*** Handshake failed ***\n");
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
478
587
gnutls_perror (ret);
479
588
retval = -1;
480
goto exit;
589
goto mandos_end;
481
590
}
482
591
break;
483
592
default:
484
593
fprintf(stderr, "Unknown error while reading data from"
485
" encrypted session with mandos server\n");
594
" encrypted session with Mandos server\n");
486
595
retval = -1;
487
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
488
goto exit;
597
goto mandos_end;
489
598
}
490
599
} else {
491
600
buffer_length += (size_t) ret;
492
601
}
493
602
}
494
603
604
if(debug){
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
495
610
if (buffer_length > 0){
496
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
497
612
buffer_length,
498
613
&decrypted_buffer,
499
614
keydir);
500
615
if (decrypted_buffer_size >= 0){
616
written = 0;
501
617
while(written < (size_t) decrypted_buffer_size){
502
618
ret = (int)fwrite (decrypted_buffer + written, 1,
503
619
(size_t)decrypted_buffer_size - written,
517
633
retval = -1;
518
634
}
519
635
}
520
521
//shutdown procedure
522
523
if(debug){
524
fprintf(stderr, "Closing TLS session\n");
525
}
526
636
637
/* Shutdown procedure */
638
639
mandos_end:
527
640
free(buffer);
528
gnutls_bye (session, GNUTLS_SHUT_RDWR);
529
exit:
530
641
close(tcp_sd);
531
642
gnutls_deinit (session);
532
gnutls_certificate_free_credentials (mc->cred);
533
gnutls_global_deinit ();
534
643
return retval;
535
644
}
536
645
537
static void resolve_callback( AvahiSServiceResolver *r,
538
AvahiIfIndex interface,
539
AVAHI_GCC_UNUSED AvahiProtocol protocol,
540
AvahiResolverEvent event,
541
const char *name,
542
const char *type,
543
const char *domain,
544
const char *host_name,
545
const AvahiAddress *address,
546
uint16_t port,
547
AVAHI_GCC_UNUSED AvahiStringList *txt,
548
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
549
void* userdata) {
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) {
550
660
mandos_context *mc = userdata;
551
661
assert(r); /* Spurious warning */
552
662
556
666
switch (event) {
557
667
default:
558
668
case AVAHI_RESOLVER_FAILURE:
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
561
671
avahi_strerror(avahi_server_errno(mc->server)));
562
672
break;
563
673
566
676
char ip[AVAHI_ADDRESS_STR_MAX];
567
677
avahi_address_snprint(ip, sizeof(ip), address);
568
678
if(debug){
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" 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);
571
681
}
572
682
int ret = start_mandos_communication(ip, port, interface, mc);
573
683
if (ret == 0){
585
695
const char *name,
586
696
const char *type,
587
697
const char *domain,
588
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
698
AVAHI_GCC_UNUSED AvahiLookupResultFlags
699
flags,
589
700
void* userdata) {
590
701
mandos_context *mc = userdata;
591
702
assert(b); /* Spurious warning */
597
708
default:
598
709
case AVAHI_BROWSER_FAILURE:
599
710
600
fprintf(stderr, "(Browser) %s\n",
711
fprintf(stderr, "(Avahi browser) %s\n",
601
712
avahi_strerror(avahi_server_errno(mc->server)));
602
713
avahi_simple_poll_quit(mc->simple_poll);
603
714
return;
604
715
605
716
case AVAHI_BROWSER_NEW:
606
/* We ignore the returned resolver object. In the callback
607
function we free it. If the server is terminated before
608
the callback function is called the server will free
609
the resolver for us. */
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. */
610
721
611
if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
612
type, domain,
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
723
protocol, name, type, domain,
613
724
AVAHI_PROTO_INET6, 0,
614
725
resolve_callback, mc)))
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(mc->server)));
726
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
727
name, avahi_strerror(avahi_server_errno(mc->server)));
617
728
break;
618
729
619
730
case AVAHI_BROWSER_REMOVE:
621
732
622
733
case AVAHI_BROWSER_ALL_FOR_NOW:
623
734
case AVAHI_BROWSER_CACHE_EXHAUSTED:
735
if(debug){
736
fprintf(stderr, "No Mandos server found, still searching...\n");
737
}
624
738
break;
625
739
}
626
740
}
646
760
}
647
761
648
762
649
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
650
AvahiServerConfig config;
763
int main(int argc, char *argv[]){
651
764
AvahiSServiceBrowser *sb = NULL;
652
765
int error;
653
766
int ret;
654
int debug_int;
655
int returncode = EXIT_SUCCESS;
767
int exitcode = EXIT_SUCCESS;
656
768
const char *interface = "eth0";
657
769
struct ifreq network;
658
770
int sd;
771
uid_t uid;
772
gid_t gid;
659
773
char *connect_to = NULL;
660
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
661
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
662
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
663
780
664
debug_int = debug ? 1 : 0;
665
while (true){
666
struct option long_options[] = {
667
{"debug", no_argument, &debug_int, 1},
668
{"connect", required_argument, NULL, 'c'},
669
{"interface", required_argument, NULL, 'i'},
670
{"keydir", required_argument, NULL, 'd'},
671
{"seckey", required_argument, NULL, 's'},
672
{"pubkey", required_argument, NULL, 'p'},
673
{"dh-bits", required_argument, NULL, 'D'},
674
{"priority", required_argument, NULL, 'P'},
675
{0, 0, 0, 0} };
676
677
int option_index = 0;
678
ret = getopt_long (argc, argv, "i:", long_options,
679
&option_index);
680
681
if (ret == -1){
682
break;
683
}
684
685
switch(ret){
686
case 0:
687
break;
688
case 'i':
689
interface = optarg;
690
break;
691
case 'c':
692
connect_to = optarg;
693
break;
694
case 'd':
695
keydir = optarg;
696
break;
697
case 'p':
698
pubkeyfile = optarg;
699
break;
700
case 's':
701
seckeyfile = optarg;
702
break;
703
case 'D':
704
errno = 0;
705
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
706
if (errno){
707
perror("strtol");
708
exit(EXIT_FAILURE);
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;
709
857
}
710
break;
711
case 'P':
712
mc.priority = optarg;
713
break;
714
case '?':
715
default:
716
exit(EXIT_FAILURE);
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;
717
870
}
718
871
}
719
debug = debug_int ? true : false;
720
872
721
873
pubkeyfile = combinepath(keydir, pubkeyfile);
722
874
if (pubkeyfile == NULL){
723
875
perror("combinepath");
724
returncode = EXIT_FAILURE;
725
goto exit;
876
exitcode = EXIT_FAILURE;
877
goto end;
726
878
}
727
879
728
880
seckeyfile = combinepath(keydir, seckeyfile);
729
881
if (seckeyfile == NULL){
730
882
perror("combinepath");
731
goto exit;
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");
732
905
}
733
906
734
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
743
916
char *address = strrchr(connect_to, ':');
744
917
if(address == NULL){
745
918
fprintf(stderr, "No colon in address\n");
746
exit(EXIT_FAILURE);
919
exitcode = EXIT_FAILURE;
920
goto end;
747
921
}
748
922
errno = 0;
749
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
750
924
if(errno){
751
925
perror("Bad port number");
752
exit(EXIT_FAILURE);
926
exitcode = EXIT_FAILURE;
927
goto end;
753
928
}
754
929
*address = '\0';
755
930
address = connect_to;
756
931
ret = start_mandos_communication(address, port, if_index, &mc);
757
932
if(ret < 0){
758
exit(EXIT_FAILURE);
933
exitcode = EXIT_FAILURE;
759
934
} else {
760
exit(EXIT_SUCCESS);
935
exitcode = EXIT_SUCCESS;
761
936
}
937
goto end;
762
938
}
763
939
764
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
765
if(sd < 0) {
766
perror("socket");
767
returncode = EXIT_FAILURE;
768
goto exit;
769
}
770
strcpy(network.ifr_name, interface); /* Spurious warning */
771
ret = ioctl(sd, SIOCGIFFLAGS, &network);
772
if(ret == -1){
773
774
perror("ioctl SIOCGIFFLAGS");
775
returncode = EXIT_FAILURE;
776
goto exit;
777
}
778
if((network.ifr_flags & IFF_UP) == 0){
779
network.ifr_flags |= IFF_UP;
780
ret = ioctl(sd, SIOCSIFFLAGS, &network);
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);
781
950
if(ret == -1){
782
perror("ioctl SIOCSIFFLAGS");
783
returncode = EXIT_FAILURE;
784
goto exit;
785
}
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);
786
965
}
787
close(sd);
788
966
789
967
if (not debug){
790
968
avahi_set_log_function(empty_log);
791
969
}
792
970
793
/* Initialize the psuedo-RNG */
971
/* Initialize the pseudo-RNG for Avahi */
794
972
srand((unsigned int) time(NULL));
795
796
/* Allocate main loop object */
797
if (!(mc.simple_poll = avahi_simple_poll_new())) {
798
fprintf(stderr, "Failed to create simple poll object.\n");
799
returncode = EXIT_FAILURE;
800
goto exit;
801
}
802
803
/* Do not publish any local records */
804
avahi_server_config_init(&config);
805
config.publish_hinfo = 0;
806
config.publish_addresses = 0;
807
config.publish_workstation = 0;
808
config.publish_domain = 0;
809
810
/* Allocate a new server */
811
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
812
&config, NULL, NULL, &error);
813
814
/* Free the configuration data */
815
avahi_server_config_free(&config);
816
817
/* Check if creating the server object succeeded */
818
if (!mc.server) {
819
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",
820
1004
avahi_strerror(error));
821
returncode = EXIT_FAILURE;
822
goto exit;
1005
exitcode = EXIT_FAILURE;
1006
goto end;
823
1007
}
824
1008
825
/* Create the service browser */
1009
/* Create the Avahi service browser */
826
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
827
1011
AVAHI_PROTO_INET6,
828
1012
"_mandos._tcp", NULL, 0,
829
1013
browse_callback, &mc);
830
if (!sb) {
1014
if (sb == NULL) {
831
1015
fprintf(stderr, "Failed to create service browser: %s\n",
832
1016
avahi_strerror(avahi_server_errno(mc.server)));
833
returncode = EXIT_FAILURE;
834
goto exit;
1017
exitcode = EXIT_FAILURE;
1018
goto end;
835
1019
}
836
1020
837
1021
/* Run the main loop */
838
1022
839
1023
if (debug){
840
fprintf(stderr, "Starting avahi loop search\n");
1024
fprintf(stderr, "Starting Avahi loop search\n");
841
1025
}
842
1026
843
1027
avahi_simple_poll_loop(mc.simple_poll);
844
1028
845
exit:
1029
end:
846
1030
847
1031
if (debug){
848
1032
fprintf(stderr, "%s exiting\n", argv[0]);
849
1033
}
850
1034
851
1035
/* Cleanup things */
852
if (sb)
1036
if (sb != NULL)
853
1037
avahi_s_service_browser_free(sb);
854
1038
855
if (mc.server)
1039
if (mc.server != NULL)
856
1040
avahi_server_free(mc.server);
857
1041
858
if (mc.simple_poll)
1042
if (mc.simple_poll != NULL)
859
1043
avahi_simple_poll_free(mc.simple_poll);
860
1044
free(pubkeyfile);
861
1045
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
862
1051
863
return returncode;
1052
return exitcode;
864
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0