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- Committer: Teddy Hogeborn
- Date: 2008-08-09 15:56:13 UTC
- mfrom: (24.1.29 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080809155613-pm1o10yh44nafc0g
Merge.
- 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
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_* */
41
77
#include <avahi-core/core.h>
42
78
#include <avahi-core/lookup.h>
43
79
#include <avahi-core/log.h>
45
81
#include <avahi-common/malloc.h>
46
82
#include <avahi-common/error.h>
47
83
48
//mandos client part
49
#include <sys/types.h> /* socket(), inet_pton() */
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
51
struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
53
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
54
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
61
62
// gpgme
63
#include <errno.h> /* perror() */
64
#include <gpgme.h>
65
66
// getopt long
67
#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_* */
68
97
69
98
#define BUFFER_SIZE 256
70
#define DH_BITS 1024
71
72
static const char *certdir = "/conf/conf.d/mandos";
73
static const char *certfile = "openpgp-client.txt";
74
static const char *certkey = "openpgp-client-key.txt";
75
99
76
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 0.9";
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
105
106
/* Used for passing in values through the Avahi callback functions */
78
107
typedef struct {
79
gnutls_session_t session;
108
AvahiSimplePoll *simple_poll;
109
AvahiServer *server;
80
110
gnutls_certificate_credentials_t cred;
111
unsigned int dh_bits;
81
112
gnutls_dh_params_t dh_params;
82
} encrypted_session;
83
84
85
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
86
char **new_packet,
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,
87
140
const char *homedir){
88
141
gpgme_data_t dh_crypto, dh_plain;
89
142
gpgme_ctx_t ctx;
90
143
gpgme_error_t rc;
91
144
ssize_t ret;
92
ssize_t new_packet_capacity = 0;
93
ssize_t new_packet_length = 0;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
94
147
gpgme_engine_info_t engine_info;
95
148
96
149
if (debug){
97
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
98
151
}
99
152
100
153
/* Init GPGME */
106
159
return -1;
107
160
}
108
161
109
/* Set GPGME home directory */
162
/* Set GPGME home directory for the OpenPGP engine only */
110
163
rc = gpgme_get_engine_info (&engine_info);
111
164
if (rc != GPG_ERR_NO_ERROR){
112
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
122
175
engine_info = engine_info->next;
123
176
}
124
177
if(engine_info == NULL){
125
fprintf(stderr, "Could not set home dir to %s\n", homedir);
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
126
179
return -1;
127
180
}
128
181
129
/* Create new GPGME data buffer from packet buffer */
130
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);
131
185
if (rc != GPG_ERR_NO_ERROR){
132
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
133
187
gpgme_strsource(rc), gpgme_strerror(rc));
139
193
if (rc != GPG_ERR_NO_ERROR){
140
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
141
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
gpgme_data_release(dh_crypto);
142
197
return -1;
143
198
}
144
199
147
202
if (rc != GPG_ERR_NO_ERROR){
148
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
149
204
gpgme_strsource(rc), gpgme_strerror(rc));
150
return -1;
205
plaintext_length = -1;
206
goto decrypt_end;
151
207
}
152
208
153
/* Decrypt data from the FILE pointer to the plaintext data
154
buffer */
209
/* Decrypt data from the cryptotext data buffer to the plaintext
210
data buffer */
155
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
156
212
if (rc != GPG_ERR_NO_ERROR){
157
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
158
214
gpgme_strsource(rc), gpgme_strerror(rc));
159
return -1;
215
plaintext_length = -1;
216
goto decrypt_end;
160
217
}
161
218
162
219
if(debug){
163
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
164
221
}
165
222
166
223
if (debug){
167
224
gpgme_decrypt_result_t result;
168
225
result = gpgme_op_decrypt_result(ctx);
192
249
}
193
250
}
194
251
195
/* Delete the GPGME FILE pointer cryptotext data buffer */
196
gpgme_data_release(dh_crypto);
197
198
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
199
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
200
254
perror("pgpme_data_seek");
255
plaintext_length = -1;
256
goto decrypt_end;
201
257
}
202
258
203
*new_packet = 0;
259
*plaintext = NULL;
204
260
while(true){
205
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
206
*new_packet = realloc(*new_packet,
207
(unsigned int)new_packet_capacity
208
+ BUFFER_SIZE);
209
if (*new_packet == NULL){
210
perror("realloc");
211
return -1;
212
}
213
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;
214
268
}
215
269
216
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
217
271
BUFFER_SIZE);
218
272
/* Print the data, if any */
219
273
if (ret == 0){
274
/* EOF */
220
275
break;
221
276
}
222
277
if(ret < 0){
223
278
perror("gpgme_data_read");
224
return -1;
279
plaintext_length = -1;
280
goto decrypt_end;
225
281
}
226
new_packet_length += ret;
282
plaintext_length += ret;
227
283
}
228
284
229
/* FIXME: check characters before printing to screen so to not print
230
terminal control characters */
231
/* if(debug){ */
232
/* fprintf(stderr, "decrypted password is: "); */
233
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
234
/* fprintf(stderr, "\n"); */
235
/* } */
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);
236
297
237
298
/* Delete the GPGME plaintext data buffer */
238
299
gpgme_data_release(dh_plain);
239
return new_packet_length;
300
return plaintext_length;
240
301
}
241
302
242
303
static const char * safer_gnutls_strerror (int value) {
246
307
return ret;
247
308
}
248
309
310
/* GnuTLS log function callback */
249
311
static void debuggnutls(__attribute__((unused)) int level,
250
312
const char* string){
251
fprintf(stderr, "%s", string);
313
fprintf(stderr, "GnuTLS: %s", string);
252
314
}
253
315
254
static int initgnutls(encrypted_session *es){
255
const char *err;
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
256
319
int ret;
257
320
258
321
if(debug){
259
322
fprintf(stderr, "Initializing GnuTLS\n");
260
323
}
261
262
if ((ret = gnutls_global_init ())
263
!= GNUTLS_E_SUCCESS) {
264
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));
265
329
return -1;
266
330
}
267
331
268
332
if (debug){
333
/* "Use a log level over 10 to enable all debugging options."
334
* - GnuTLS manual
335
*/
269
336
gnutls_global_set_log_level(11);
270
337
gnutls_global_set_log_function(debuggnutls);
271
338
}
272
339
273
/* openpgp credentials */
274
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
275
!= GNUTLS_E_SUCCESS) {
276
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",
277
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
278
346
return -1;
279
347
}
280
348
281
349
if(debug){
282
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
283
" and keyfile %s as GnuTLS credentials\n", certfile,
284
certkey);
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
285
353
}
286
354
287
355
ret = gnutls_certificate_set_openpgp_key_file
288
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
289
357
if (ret != GNUTLS_E_SUCCESS) {
290
fprintf
291
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
292
" '%s')\n",
293
ret, certfile, certkey);
294
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",
295
362
safer_gnutls_strerror(ret));
296
return -1;
297
}
298
299
//GnuTLS server initialization
300
if ((ret = gnutls_dh_params_init (&es->dh_params))
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "Error in dh parameter initialization: %s\n",
303
safer_gnutls_strerror(ret));
304
return -1;
305
}
306
307
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
308
!= GNUTLS_E_SUCCESS) {
309
fprintf (stderr, "Error in prime generation: %s\n",
310
safer_gnutls_strerror(ret));
311
return -1;
312
}
313
314
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
315
316
// GnuTLS session creation
317
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
318
!= 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){
319
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
320
399
safer_gnutls_strerror(ret));
321
400
}
322
401
323
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
324
!= GNUTLS_E_SUCCESS) {
325
fprintf(stderr, "Syntax error at: %s\n", err);
326
fprintf(stderr, "GnuTLS error: %s\n",
327
safer_gnutls_strerror(ret));
328
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
}
329
412
}
330
413
331
if ((ret = gnutls_credentials_set
332
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
333
!= GNUTLS_E_SUCCESS) {
334
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",
335
418
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
336
420
return -1;
337
421
}
338
422
339
423
/* ignore client certificate if any. */
340
gnutls_certificate_server_set_request (es->session,
424
gnutls_certificate_server_set_request (*session,
341
425
GNUTLS_CERT_IGNORE);
342
426
343
gnutls_dh_set_prime_bits (es->session, DH_BITS);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
344
428
345
429
return 0;
346
430
}
347
431
432
/* Avahi log function callback */
348
433
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
349
434
__attribute__((unused)) const char *txt){}
350
435
436
/* Called when a Mandos server is found */
351
437
static int start_mandos_communication(const char *ip, uint16_t port,
352
AvahiIfIndex if_index){
438
AvahiIfIndex if_index,
439
mandos_context *mc){
353
440
int ret, tcp_sd;
354
struct sockaddr_in6 to;
355
encrypted_session es;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
356
442
char *buffer = NULL;
357
443
char *decrypted_buffer;
358
444
size_t buffer_length = 0;
359
445
size_t buffer_capacity = 0;
360
446
ssize_t decrypted_buffer_size;
361
size_t written = 0;
447
size_t written;
362
448
int retval = 0;
363
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
}
364
456
365
457
if(debug){
366
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
372
464
perror("socket");
373
465
return -1;
374
466
}
375
376
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
if(debug){
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
378
470
perror("if_indextoname");
471
return -1;
379
472
}
380
return -1;
381
}
382
383
if(debug){
384
473
fprintf(stderr, "Binding to interface %s\n", interface);
385
474
}
386
475
387
476
memset(&to,0,sizeof(to)); /* Spurious warning */
388
to.sin6_family = AF_INET6;
389
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);
390
481
if (ret < 0 ){
391
482
perror("inet_pton");
392
483
return -1;
393
}
484
}
394
485
if(ret == 0){
395
486
fprintf(stderr, "Bad address: %s\n", ip);
396
487
return -1;
397
488
}
398
to.sin6_port = htons(port); /* Spurious warning */
489
to.in6.sin6_port = htons(port); /* Spurious warning */
399
490
400
to.sin6_scope_id = (uint32_t)if_index;
491
to.in6.sin6_scope_id = (uint32_t)if_index;
401
492
402
493
if(debug){
403
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
404
/* char addrstr[INET6_ADDRSTRLEN]; */
405
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
406
/* sizeof(addrstr)) == NULL){ */
407
/* perror("inet_ntop"); */
408
/* } else { */
409
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
410
/* addrstr, ntohs(to.sin6_port)); */
411
/* } */
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
}
412
504
}
413
505
414
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
506
ret = connect(tcp_sd, &to.in, sizeof(to));
415
507
if (ret < 0){
416
508
perror("connect");
417
509
return -1;
418
510
}
419
420
ret = initgnutls (&es);
421
if (ret != 0){
422
retval = -1;
423
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
}
424
534
}
425
426
gnutls_transport_set_ptr (es.session,
427
(gnutls_transport_ptr_t) tcp_sd);
428
535
429
536
if(debug){
430
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
431
538
}
432
539
433
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);
434
545
435
546
if (ret != GNUTLS_E_SUCCESS){
436
547
if(debug){
437
fprintf(stderr, "\n*** Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
438
549
gnutls_perror (ret);
439
550
}
440
551
retval = -1;
441
goto exit;
552
goto mandos_end;
442
553
}
443
554
444
//Retrieve OpenPGP packet that contains the wanted password
555
/* Read OpenPGP packet that contains the wanted password */
445
556
446
557
if(debug){
447
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
449
560
}
450
561
451
562
while(true){
452
if (buffer_length + BUFFER_SIZE > buffer_capacity){
453
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
454
if (buffer == NULL){
455
perror("realloc");
456
goto exit;
457
}
458
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;
459
569
}
460
570
461
ret = gnutls_record_recv
462
(es.session, buffer+buffer_length, BUFFER_SIZE);
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
463
573
if (ret == 0){
464
574
break;
465
575
}
469
579
case GNUTLS_E_AGAIN:
470
580
break;
471
581
case GNUTLS_E_REHANDSHAKE:
472
ret = gnutls_handshake (es.session);
582
do{
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
473
585
if (ret < 0){
474
fprintf(stderr, "\n*** Handshake failed ***\n");
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
475
587
gnutls_perror (ret);
476
588
retval = -1;
477
goto exit;
589
goto mandos_end;
478
590
}
479
591
break;
480
592
default:
481
593
fprintf(stderr, "Unknown error while reading data from"
482
" encrypted session with mandos server\n");
594
" encrypted session with Mandos server\n");
483
595
retval = -1;
484
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
485
goto exit;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
597
goto mandos_end;
486
598
}
487
599
} else {
488
600
buffer_length += (size_t) ret;
489
601
}
490
602
}
491
603
604
if(debug){
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
492
610
if (buffer_length > 0){
493
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
494
612
buffer_length,
495
613
&decrypted_buffer,
496
certdir);
614
keydir);
497
615
if (decrypted_buffer_size >= 0){
616
written = 0;
498
617
while(written < (size_t) decrypted_buffer_size){
499
618
ret = (int)fwrite (decrypted_buffer + written, 1,
500
619
(size_t)decrypted_buffer_size - written,
514
633
retval = -1;
515
634
}
516
635
}
517
518
//shutdown procedure
519
520
if(debug){
521
fprintf(stderr, "Closing TLS session\n");
522
}
523
636
637
/* Shutdown procedure */
638
639
mandos_end:
524
640
free(buffer);
525
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
526
exit:
527
641
close(tcp_sd);
528
gnutls_deinit (es.session);
529
gnutls_certificate_free_credentials (es.cred);
530
gnutls_global_deinit ();
642
gnutls_deinit (session);
531
643
return retval;
532
644
}
533
645
534
static AvahiSimplePoll *simple_poll = NULL;
535
static AvahiServer *server = NULL;
536
537
static void resolve_callback(
538
AvahiSServiceResolver *r,
539
AvahiIfIndex interface,
540
AVAHI_GCC_UNUSED AvahiProtocol protocol,
541
AvahiResolverEvent event,
542
const char *name,
543
const char *type,
544
const char *domain,
545
const char *host_name,
546
const AvahiAddress *address,
547
uint16_t port,
548
AVAHI_GCC_UNUSED AvahiStringList *txt,
549
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
550
AVAHI_GCC_UNUSED void* userdata) {
551
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;
552
661
assert(r); /* Spurious warning */
553
662
554
663
/* Called whenever a service has been resolved successfully or
557
666
switch (event) {
558
667
default:
559
668
case AVAHI_RESOLVER_FAILURE:
560
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
561
" type '%s' in domain '%s': %s\n", name, type, domain,
562
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)));
563
672
break;
564
673
565
674
case AVAHI_RESOLVER_FOUND:
567
676
char ip[AVAHI_ADDRESS_STR_MAX];
568
677
avahi_address_snprint(ip, sizeof(ip), address);
569
678
if(debug){
570
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
571
" 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);
572
681
}
573
int ret = start_mandos_communication(ip, port, interface);
682
int ret = start_mandos_communication(ip, port, interface, mc);
574
683
if (ret == 0){
575
684
exit(EXIT_SUCCESS);
576
685
}
579
688
avahi_s_service_resolver_free(r);
580
689
}
581
690
582
static void browse_callback(
583
AvahiSServiceBrowser *b,
584
AvahiIfIndex interface,
585
AvahiProtocol protocol,
586
AvahiBrowserEvent event,
587
const char *name,
588
const char *type,
589
const char *domain,
590
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
591
void* userdata) {
592
593
AvahiServer *s = userdata;
594
assert(b); /* Spurious warning */
595
596
/* Called whenever a new services becomes available on the LAN or
597
is removed from the LAN */
598
599
switch (event) {
600
default:
601
case AVAHI_BROWSER_FAILURE:
602
603
fprintf(stderr, "(Browser) %s\n",
604
avahi_strerror(avahi_server_errno(server)));
605
avahi_simple_poll_quit(simple_poll);
606
return;
607
608
case AVAHI_BROWSER_NEW:
609
/* We ignore the returned resolver object. In the callback
610
function we free it. If the server is terminated before
611
the callback function is called the server will free
612
the resolver for us. */
613
614
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
615
type, domain,
616
AVAHI_PROTO_INET6, 0,
617
resolve_callback, s)))
618
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
619
avahi_strerror(avahi_server_errno(s)));
620
break;
621
622
case AVAHI_BROWSER_REMOVE:
623
break;
624
625
case AVAHI_BROWSER_ALL_FOR_NOW:
626
case AVAHI_BROWSER_CACHE_EXHAUSTED:
627
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");
628
737
}
738
break;
739
}
629
740
}
630
741
631
742
/* Combines file name and path and returns the malloced new
638
749
return NULL;
639
750
}
640
751
if(f_len > 0){
641
memcpy(tmp, first, f_len);
752
memcpy(tmp, first, f_len); /* Spurious warning */
642
753
}
643
754
tmp[f_len] = '/';
644
755
if(s_len > 0){
645
memcpy(tmp + f_len + 1, second, s_len);
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
646
757
}
647
758
tmp[f_len + 1 + s_len] = '\0';
648
759
return tmp;
649
760
}
650
761
651
762
652
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
653
AvahiServerConfig config;
763
int main(int argc, char *argv[]){
654
764
AvahiSServiceBrowser *sb = NULL;
655
765
int error;
656
766
int ret;
657
int returncode = EXIT_SUCCESS;
658
const char *interface = NULL;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
770
int sd;
771
uid_t uid;
772
gid_t gid;
773
char *connect_to = NULL;
659
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
660
char *connect_to = NULL;
661
662
while (true){
663
static struct option long_options[] = {
664
{"debug", no_argument, (int *)&debug, 1},
665
{"connect", required_argument, 0, 'C'},
666
{"interface", required_argument, 0, 'i'},
667
{"certdir", required_argument, 0, 'd'},
668
{"certkey", required_argument, 0, 'c'},
669
{"certfile", required_argument, 0, 'k'},
670
{0, 0, 0, 0} };
671
672
int option_index = 0;
673
ret = getopt_long (argc, argv, "i:", long_options,
674
&option_index);
675
676
if (ret == -1){
677
break;
678
}
679
680
switch(ret){
681
case 0:
682
break;
683
case 'i':
684
interface = optarg;
685
break;
686
case 'C':
687
connect_to = optarg;
688
break;
689
case 'd':
690
certdir = optarg;
691
break;
692
case 'c':
693
certfile = optarg;
694
break;
695
case 'k':
696
certkey = optarg;
697
break;
698
default:
699
exit(EXIT_FAILURE);
700
}
701
}
702
703
certfile = combinepath(certdir, certfile);
704
if (certfile == NULL){
705
perror("combinepath");
706
goto exit;
707
}
708
709
if(interface != NULL){
710
if_index = (AvahiIfIndex) if_nametoindex(interface);
711
if(if_index == 0){
712
fprintf(stderr, "No such interface: \"%s\"\n", interface);
713
exit(EXIT_FAILURE);
714
}
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);
715
911
}
716
912
717
913
if(connect_to != NULL){
720
916
char *address = strrchr(connect_to, ':');
721
917
if(address == NULL){
722
918
fprintf(stderr, "No colon in address\n");
723
exit(EXIT_FAILURE);
919
exitcode = EXIT_FAILURE;
920
goto end;
724
921
}
725
922
errno = 0;
726
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
727
924
if(errno){
728
925
perror("Bad port number");
729
exit(EXIT_FAILURE);
926
exitcode = EXIT_FAILURE;
927
goto end;
730
928
}
731
929
*address = '\0';
732
930
address = connect_to;
733
ret = start_mandos_communication(address, port, if_index);
931
ret = start_mandos_communication(address, port, if_index, &mc);
734
932
if(ret < 0){
735
exit(EXIT_FAILURE);
933
exitcode = EXIT_FAILURE;
736
934
} else {
737
exit(EXIT_SUCCESS);
935
exitcode = EXIT_SUCCESS;
738
936
}
937
goto end;
739
938
}
740
939
741
certkey = combinepath(certdir, certkey);
742
if (certkey == NULL){
743
perror("combinepath");
744
goto exit;
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);
745
965
}
746
966
747
967
if (not debug){
748
968
avahi_set_log_function(empty_log);
749
969
}
750
970
751
/* Initialize the psuedo-RNG */
971
/* Initialize the pseudo-RNG for Avahi */
752
972
srand((unsigned int) time(NULL));
753
754
/* Allocate main loop object */
755
if (!(simple_poll = avahi_simple_poll_new())) {
756
fprintf(stderr, "Failed to create simple poll object.\n");
757
758
goto exit;
759
}
760
761
/* Do not publish any local records */
762
avahi_server_config_init(&config);
763
config.publish_hinfo = 0;
764
config.publish_addresses = 0;
765
config.publish_workstation = 0;
766
config.publish_domain = 0;
767
768
/* Allocate a new server */
769
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
770
&config, NULL, NULL, &error);
771
772
/* Free the configuration data */
773
avahi_server_config_free(&config);
774
775
/* Check if creating the server object succeeded */
776
if (!server) {
777
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",
778
1004
avahi_strerror(error));
779
returncode = EXIT_FAILURE;
780
goto exit;
1005
exitcode = EXIT_FAILURE;
1006
goto end;
781
1007
}
782
1008
783
/* Create the service browser */
784
sb = avahi_s_service_browser_new(server, if_index,
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
785
1011
AVAHI_PROTO_INET6,
786
1012
"_mandos._tcp", NULL, 0,
787
browse_callback, server);
788
if (!sb) {
1013
browse_callback, &mc);
1014
if (sb == NULL) {
789
1015
fprintf(stderr, "Failed to create service browser: %s\n",
790
avahi_strerror(avahi_server_errno(server)));
791
returncode = EXIT_FAILURE;
792
goto exit;
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
793
1019
}
794
1020
795
1021
/* Run the main loop */
796
1022
797
1023
if (debug){
798
fprintf(stderr, "Starting avahi loop search\n");
1024
fprintf(stderr, "Starting Avahi loop search\n");
799
1025
}
800
1026
801
avahi_simple_poll_loop(simple_poll);
1027
avahi_simple_poll_loop(mc.simple_poll);
802
1028
803
exit:
1029
end:
804
1030
805
1031
if (debug){
806
1032
fprintf(stderr, "%s exiting\n", argv[0]);
807
1033
}
808
1034
809
1035
/* Cleanup things */
810
if (sb)
1036
if (sb != NULL)
811
1037
avahi_s_service_browser_free(sb);
812
1038
813
if (server)
814
avahi_server_free(server);
815
816
if (simple_poll)
817
avahi_simple_poll_free(simple_poll);
818
free(certfile);
819
free(certkey);
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
}
820
1051
821
return returncode;
1052
return exitcode;
822
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0