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- Committer: Teddy Hogeborn
- Date: 2008-08-10 20:35:01 UTC
- mfrom: (24.1.42 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080810203501-euh3qcf1nopilksm
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 <inttypes.h> /* PRIu16 */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
56
connect() */
57
#include <assert.h> /* assert() */
58
#include <errno.h> /* perror(), errno */
59
#include <time.h> /* time() */
60
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
61
SIOCSIFFLAGS, if_indextoname(),
62
if_nametoindex(), IF_NAMESIZE */
63
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
64
getuid(), getgid(), setuid(),
65
setgid() */
66
#include <netinet/in.h>
67
#include <arpa/inet.h> /* inet_pton(), htons */
68
#include <iso646.h> /* not, and */
69
#include <argp.h> /* struct argp_option, error_t, struct
70
argp_state, struct argp,
71
argp_parse(), ARGP_KEY_ARG,
72
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
73
74
/* Avahi */
75
/* All Avahi types, constants and functions
76
Avahi*, avahi_*,
77
AVAHI_* */
41
78
#include <avahi-core/core.h>
42
79
#include <avahi-core/lookup.h>
43
80
#include <avahi-core/log.h>
45
82
#include <avahi-common/malloc.h>
46
83
#include <avahi-common/error.h>
47
84
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>
85
/* GnuTLS */
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
87
gnutls_*
88
init_gnutls_session(),
89
GNUTLS_* */
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
91
GNUTLS_OPENPGP_FMT_BASE64 */
92
93
/* GPGME */
94
#include <gpgme.h> /* All GPGME types, constants and functions
95
gpgme_*
96
GPGME_PROTOCOL_OpenPGP,
97
GPG_ERR_NO_* */
68
98
69
99
#define BUFFER_SIZE 256
70
100
71
static int dh_bits = 1024;
72
101
bool debug = false;
73
102
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 */
103
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
107
/* Used for passing in values through the Avahi callback functions */
80
108
typedef struct {
81
gnutls_session_t session;
109
AvahiSimplePoll *simple_poll;
110
AvahiServer *server;
82
111
gnutls_certificate_credentials_t cred;
112
unsigned int dh_bits;
83
113
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
114
const char *priority;
115
} mandos_context;
116
117
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
120
* "buffer_length" is how much is already used.
121
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
127
return 0;
128
}
129
buffer_capacity += BUFFER_SIZE;
130
}
131
return buffer_capacity;
132
}
133
134
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
137
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
89
141
const char *homedir){
90
142
gpgme_data_t dh_crypto, dh_plain;
91
143
gpgme_ctx_t ctx;
92
144
gpgme_error_t rc;
93
145
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
96
148
gpgme_engine_info_t engine_info;
97
149
98
150
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
100
152
}
101
153
102
154
/* Init GPGME */
108
160
return -1;
109
161
}
110
162
111
/* Set GPGME home directory */
163
/* Set GPGME home directory for the OpenPGP engine only */
112
164
rc = gpgme_get_engine_info (&engine_info);
113
165
if (rc != GPG_ERR_NO_ERROR){
114
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
124
176
engine_info = engine_info->next;
125
177
}
126
178
if(engine_info == NULL){
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
128
180
return -1;
129
181
}
130
182
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
183
/* Create new GPGME data buffer from memory cryptotext */
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
0);
133
186
if (rc != GPG_ERR_NO_ERROR){
134
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
135
188
gpgme_strsource(rc), gpgme_strerror(rc));
141
194
if (rc != GPG_ERR_NO_ERROR){
142
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
143
196
gpgme_strsource(rc), gpgme_strerror(rc));
197
gpgme_data_release(dh_crypto);
144
198
return -1;
145
199
}
146
200
149
203
if (rc != GPG_ERR_NO_ERROR){
150
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
151
205
gpgme_strsource(rc), gpgme_strerror(rc));
152
return -1;
206
plaintext_length = -1;
207
goto decrypt_end;
153
208
}
154
209
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
210
/* Decrypt data from the cryptotext data buffer to the plaintext
211
data buffer */
157
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
158
213
if (rc != GPG_ERR_NO_ERROR){
159
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
160
215
gpgme_strsource(rc), gpgme_strerror(rc));
161
return -1;
216
plaintext_length = -1;
217
goto decrypt_end;
162
218
}
163
219
164
220
if(debug){
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
166
222
}
167
223
168
224
if (debug){
169
225
gpgme_decrypt_result_t result;
170
226
result = gpgme_op_decrypt_result(ctx);
173
229
} else {
174
230
fprintf(stderr, "Unsupported algorithm: %s\n",
175
231
result->unsupported_algorithm);
176
fprintf(stderr, "Wrong key usage: %d\n",
232
fprintf(stderr, "Wrong key usage: %u\n",
177
233
result->wrong_key_usage);
178
234
if(result->file_name != NULL){
179
235
fprintf(stderr, "File name: %s\n", result->file_name);
194
250
}
195
251
}
196
252
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
199
200
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
201
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
255
perror("pgpme_data_seek");
256
plaintext_length = -1;
257
goto decrypt_end;
203
258
}
204
259
205
*new_packet = 0;
260
*plaintext = NULL;
206
261
while(true){
207
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
208
*new_packet = realloc(*new_packet,
209
(unsigned int)new_packet_capacity
210
+ BUFFER_SIZE);
211
if (*new_packet == NULL){
212
perror("realloc");
213
return -1;
214
}
215
new_packet_capacity += BUFFER_SIZE;
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
264
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
268
goto decrypt_end;
216
269
}
217
270
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
272
BUFFER_SIZE);
220
273
/* Print the data, if any */
221
274
if (ret == 0){
275
/* EOF */
222
276
break;
223
277
}
224
278
if(ret < 0){
225
279
perror("gpgme_data_read");
226
return -1;
280
plaintext_length = -1;
281
goto decrypt_end;
227
282
}
228
new_packet_length += ret;
283
plaintext_length += ret;
229
284
}
230
285
231
/* FIXME: check characters before printing to screen so to not print
232
terminal control characters */
233
/* if(debug){ */
234
/* fprintf(stderr, "decrypted password is: "); */
235
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
236
/* fprintf(stderr, "\n"); */
237
/* } */
286
if(debug){
287
fprintf(stderr, "Decrypted password is: ");
288
for(ssize_t i = 0; i < plaintext_length; i++){
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
290
}
291
fprintf(stderr, "\n");
292
}
293
294
decrypt_end:
295
296
/* Delete the GPGME cryptotext data buffer */
297
gpgme_data_release(dh_crypto);
238
298
239
299
/* Delete the GPGME plaintext data buffer */
240
300
gpgme_data_release(dh_plain);
241
return new_packet_length;
301
return plaintext_length;
242
302
}
243
303
244
304
static const char * safer_gnutls_strerror (int value) {
248
308
return ret;
249
309
}
250
310
311
/* GnuTLS log function callback */
251
312
static void debuggnutls(__attribute__((unused)) int level,
252
313
const char* string){
253
fprintf(stderr, "%s", string);
314
fprintf(stderr, "GnuTLS: %s", string);
254
315
}
255
316
256
static int initgnutls(encrypted_session *es){
257
const char *err;
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfile,
319
const char *seckeyfile){
258
320
int ret;
259
321
260
322
if(debug){
261
323
fprintf(stderr, "Initializing GnuTLS\n");
262
324
}
263
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
325
326
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
267
330
return -1;
268
331
}
269
332
270
333
if (debug){
334
/* "Use a log level over 10 to enable all debugging options."
335
* - GnuTLS manual
336
*/
271
337
gnutls_global_set_log_level(11);
272
338
gnutls_global_set_log_function(debuggnutls);
273
339
}
274
340
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
341
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
279
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
280
347
return -1;
281
348
}
282
349
287
354
}
288
355
289
356
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
291
358
if (ret != GNUTLS_E_SUCCESS) {
292
fprintf
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
" '%s')\n",
295
ret, pubkeyfile, seckeyfile);
296
fprintf(stdout, "The Error is: %s\n",
359
fprintf(stderr,
360
"Error[%d] while reading the OpenPGP key pair ('%s',"
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
297
363
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
//GnuTLS server initialization
302
if ((ret = gnutls_dh_params_init (&es->dh_params))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in dh parameter initialization: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
if ((ret = gnutls_dh_params_generate2 (es->dh_params, dh_bits))
310
!= GNUTLS_E_SUCCESS) {
311
fprintf (stderr, "Error in prime generation: %s\n",
312
safer_gnutls_strerror(ret));
313
return -1;
314
}
315
316
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
317
318
// GnuTLS session creation
319
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
320
!= GNUTLS_E_SUCCESS){
364
goto globalfail;
365
}
366
367
/* GnuTLS server initialization */
368
ret = gnutls_dh_params_init(&mc->dh_params);
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
372
goto globalfail;
373
}
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
378
goto globalfail;
379
}
380
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
382
383
return 0;
384
385
globalfail:
386
387
gnutls_certificate_free_credentials(mc->cred);
388
gnutls_global_deinit();
389
return -1;
390
391
}
392
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
395
int ret;
396
/* GnuTLS session creation */
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
321
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
400
safer_gnutls_strerror(ret));
323
401
}
324
402
325
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
326
!= GNUTLS_E_SUCCESS) {
327
fprintf(stderr, "Syntax error at: %s\n", err);
328
fprintf(stderr, "GnuTLS error: %s\n",
329
safer_gnutls_strerror(ret));
330
return -1;
403
{
404
const char *err;
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
407
fprintf(stderr, "Syntax error at: %s\n", err);
408
fprintf(stderr, "GnuTLS error: %s\n",
409
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
411
return -1;
412
}
331
413
}
332
414
333
if ((ret = gnutls_credentials_set
334
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
335
!= GNUTLS_E_SUCCESS) {
336
fprintf(stderr, "Error setting a credentials set: %s\n",
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
337
419
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
338
421
return -1;
339
422
}
340
423
341
424
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
425
gnutls_certificate_server_set_request (*session,
343
426
GNUTLS_CERT_IGNORE);
344
427
345
gnutls_dh_set_prime_bits (es->session, dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
346
429
347
430
return 0;
348
431
}
349
432
433
/* Avahi log function callback */
350
434
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
435
__attribute__((unused)) const char *txt){}
352
436
437
/* Called when a Mandos server is found */
353
438
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
439
AvahiIfIndex if_index,
440
mandos_context *mc){
355
441
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
358
443
char *buffer = NULL;
359
444
char *decrypted_buffer;
360
445
size_t buffer_length = 0;
361
446
size_t buffer_capacity = 0;
362
447
ssize_t decrypted_buffer_size;
363
size_t written = 0;
448
size_t written;
364
449
int retval = 0;
365
450
char interface[IF_NAMESIZE];
451
gnutls_session_t session;
452
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
455
return -1;
456
}
366
457
367
458
if(debug){
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
369
ip, port);
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
460
"\n", ip, port);
370
461
}
371
462
372
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
374
465
perror("socket");
375
466
return -1;
376
467
}
377
378
if(if_indextoname((unsigned int)if_index, interface) == NULL){
379
if(debug){
468
469
if(debug){
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
380
471
perror("if_indextoname");
472
return -1;
381
473
}
382
return -1;
383
}
384
385
if(debug){
386
474
fprintf(stderr, "Binding to interface %s\n", interface);
387
475
}
388
476
389
477
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
392
482
if (ret < 0 ){
393
483
perror("inet_pton");
394
484
return -1;
395
}
485
}
396
486
if(ret == 0){
397
487
fprintf(stderr, "Bad address: %s\n", ip);
398
488
return -1;
399
489
}
400
to.sin6_port = htons(port); /* Spurious warning */
490
to.in6.sin6_port = htons(port); /* Spurious warning */
401
491
402
to.sin6_scope_id = (uint32_t)if_index;
492
to.in6.sin6_scope_id = (uint32_t)if_index;
403
493
404
494
if(debug){
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
496
port);
406
497
char addrstr[INET6_ADDRSTRLEN] = "";
407
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
408
499
sizeof(addrstr)) == NULL){
409
500
perror("inet_ntop");
410
501
} else {
411
502
if(strcmp(addrstr, ip) != 0){
412
fprintf(stderr, "Canonical address form: %s\n",
413
addrstr, ntohs(to.sin6_port));
503
fprintf(stderr, "Canonical address form: %s\n", addrstr);
414
504
}
415
505
}
416
506
}
417
507
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
508
ret = connect(tcp_sd, &to.in, sizeof(to));
419
509
if (ret < 0){
420
510
perror("connect");
421
511
return -1;
422
512
}
423
424
ret = initgnutls (&es);
425
if (ret != 0){
426
retval = -1;
427
return -1;
513
514
const char *out = mandos_protocol_version;
515
written = 0;
516
while (true){
517
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
520
if (ret == -1){
521
perror("write");
522
retval = -1;
523
goto mandos_end;
524
}
525
written += (size_t)ret;
526
if(written < out_size){
527
continue;
528
} else {
529
if (out == mandos_protocol_version){
530
written = 0;
531
out = "\r\n";
532
} else {
533
break;
534
}
535
}
428
536
}
429
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
432
537
433
538
if(debug){
434
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
435
540
}
436
541
437
ret = gnutls_handshake (es.session);
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
544
do{
545
ret = gnutls_handshake (session);
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
438
547
439
548
if (ret != GNUTLS_E_SUCCESS){
440
549
if(debug){
441
fprintf(stderr, "\n*** Handshake failed ***\n");
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
442
551
gnutls_perror (ret);
443
552
}
444
553
retval = -1;
445
goto exit;
554
goto mandos_end;
446
555
}
447
556
448
//Retrieve OpenPGP packet that contains the wanted password
557
/* Read OpenPGP packet that contains the wanted password */
449
558
450
559
if(debug){
451
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
453
562
}
454
563
455
564
while(true){
456
if (buffer_length + BUFFER_SIZE > buffer_capacity){
457
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
458
if (buffer == NULL){
459
perror("realloc");
460
goto exit;
461
}
462
buffer_capacity += BUFFER_SIZE;
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
566
buffer_capacity);
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
569
retval = -1;
570
goto mandos_end;
463
571
}
464
572
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
467
575
if (ret == 0){
468
576
break;
469
577
}
473
581
case GNUTLS_E_AGAIN:
474
582
break;
475
583
case GNUTLS_E_REHANDSHAKE:
476
ret = gnutls_handshake (es.session);
584
do{
585
ret = gnutls_handshake (session);
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
477
587
if (ret < 0){
478
fprintf(stderr, "\n*** Handshake failed ***\n");
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
479
589
gnutls_perror (ret);
480
590
retval = -1;
481
goto exit;
591
goto mandos_end;
482
592
}
483
593
break;
484
594
default:
485
595
fprintf(stderr, "Unknown error while reading data from"
486
" encrypted session with mandos server\n");
596
" encrypted session with Mandos server\n");
487
597
retval = -1;
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
489
goto exit;
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
599
goto mandos_end;
490
600
}
491
601
} else {
492
602
buffer_length += (size_t) ret;
493
603
}
494
604
}
495
605
606
if(debug){
607
fprintf(stderr, "Closing TLS session\n");
608
}
609
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
611
496
612
if (buffer_length > 0){
497
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
498
614
buffer_length,
499
615
&decrypted_buffer,
500
616
keydir);
501
617
if (decrypted_buffer_size >= 0){
618
written = 0;
502
619
while(written < (size_t) decrypted_buffer_size){
503
620
ret = (int)fwrite (decrypted_buffer + written, 1,
504
621
(size_t)decrypted_buffer_size - written,
518
635
retval = -1;
519
636
}
520
637
}
521
522
//shutdown procedure
523
524
if(debug){
525
fprintf(stderr, "Closing TLS session\n");
526
}
527
638
639
/* Shutdown procedure */
640
641
mandos_end:
528
642
free(buffer);
529
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
530
exit:
531
643
close(tcp_sd);
532
gnutls_deinit (es.session);
533
gnutls_certificate_free_credentials (es.cred);
534
gnutls_global_deinit ();
644
gnutls_deinit (session);
535
645
return retval;
536
646
}
537
647
538
static AvahiSimplePoll *simple_poll = NULL;
539
static AvahiServer *server = NULL;
540
541
static void resolve_callback(
542
AvahiSServiceResolver *r,
543
AvahiIfIndex interface,
544
AVAHI_GCC_UNUSED AvahiProtocol protocol,
545
AvahiResolverEvent event,
546
const char *name,
547
const char *type,
548
const char *domain,
549
const char *host_name,
550
const AvahiAddress *address,
551
uint16_t port,
552
AVAHI_GCC_UNUSED AvahiStringList *txt,
553
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
554
AVAHI_GCC_UNUSED void* userdata) {
555
648
static void resolve_callback(AvahiSServiceResolver *r,
649
AvahiIfIndex interface,
650
AVAHI_GCC_UNUSED AvahiProtocol protocol,
651
AvahiResolverEvent event,
652
const char *name,
653
const char *type,
654
const char *domain,
655
const char *host_name,
656
const AvahiAddress *address,
657
uint16_t port,
658
AVAHI_GCC_UNUSED AvahiStringList *txt,
659
AVAHI_GCC_UNUSED AvahiLookupResultFlags
660
flags,
661
void* userdata) {
662
mandos_context *mc = userdata;
556
663
assert(r); /* Spurious warning */
557
664
558
665
/* Called whenever a service has been resolved successfully or
561
668
switch (event) {
562
669
default:
563
670
case AVAHI_RESOLVER_FAILURE:
564
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
565
" type '%s' in domain '%s': %s\n", name, type, domain,
566
avahi_strerror(avahi_server_errno(server)));
671
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
672
" of type '%s' in domain '%s': %s\n", name, type, domain,
673
avahi_strerror(avahi_server_errno(mc->server)));
567
674
break;
568
675
569
676
case AVAHI_RESOLVER_FOUND:
571
678
char ip[AVAHI_ADDRESS_STR_MAX];
572
679
avahi_address_snprint(ip, sizeof(ip), address);
573
680
if(debug){
574
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
575
" port %d\n", name, host_name, ip, port);
681
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
682
PRIu16 ") on port %d\n", name, host_name, ip,
683
interface, port);
576
684
}
577
int ret = start_mandos_communication(ip, port, interface);
685
int ret = start_mandos_communication(ip, port, interface, mc);
578
686
if (ret == 0){
579
687
exit(EXIT_SUCCESS);
580
688
}
583
691
avahi_s_service_resolver_free(r);
584
692
}
585
693
586
static void browse_callback(
587
AvahiSServiceBrowser *b,
588
AvahiIfIndex interface,
589
AvahiProtocol protocol,
590
AvahiBrowserEvent event,
591
const char *name,
592
const char *type,
593
const char *domain,
594
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
595
void* userdata) {
596
597
AvahiServer *s = userdata;
598
assert(b); /* Spurious warning */
599
600
/* Called whenever a new services becomes available on the LAN or
601
is removed from the LAN */
602
603
switch (event) {
604
default:
605
case AVAHI_BROWSER_FAILURE:
606
607
fprintf(stderr, "(Browser) %s\n",
608
avahi_strerror(avahi_server_errno(server)));
609
avahi_simple_poll_quit(simple_poll);
610
return;
611
612
case AVAHI_BROWSER_NEW:
613
/* We ignore the returned resolver object. In the callback
614
function we free it. If the server is terminated before
615
the callback function is called the server will free
616
the resolver for us. */
617
618
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
619
type, domain,
620
AVAHI_PROTO_INET6, 0,
621
resolve_callback, s)))
622
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
623
avahi_strerror(avahi_server_errno(s)));
624
break;
625
626
case AVAHI_BROWSER_REMOVE:
627
break;
628
629
case AVAHI_BROWSER_ALL_FOR_NOW:
630
case AVAHI_BROWSER_CACHE_EXHAUSTED:
631
break;
694
static void browse_callback( AvahiSServiceBrowser *b,
695
AvahiIfIndex interface,
696
AvahiProtocol protocol,
697
AvahiBrowserEvent event,
698
const char *name,
699
const char *type,
700
const char *domain,
701
AVAHI_GCC_UNUSED AvahiLookupResultFlags
702
flags,
703
void* userdata) {
704
mandos_context *mc = userdata;
705
assert(b); /* Spurious warning */
706
707
/* Called whenever a new services becomes available on the LAN or
708
is removed from the LAN */
709
710
switch (event) {
711
default:
712
case AVAHI_BROWSER_FAILURE:
713
714
fprintf(stderr, "(Avahi browser) %s\n",
715
avahi_strerror(avahi_server_errno(mc->server)));
716
avahi_simple_poll_quit(mc->simple_poll);
717
return;
718
719
case AVAHI_BROWSER_NEW:
720
/* We ignore the returned Avahi resolver object. In the callback
721
function we free it. If the Avahi server is terminated before
722
the callback function is called the Avahi server will free the
723
resolver for us. */
724
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
726
protocol, name, type, domain,
727
AVAHI_PROTO_INET6, 0,
728
resolve_callback, mc)))
729
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
730
name, avahi_strerror(avahi_server_errno(mc->server)));
731
break;
732
733
case AVAHI_BROWSER_REMOVE:
734
break;
735
736
case AVAHI_BROWSER_ALL_FOR_NOW:
737
case AVAHI_BROWSER_CACHE_EXHAUSTED:
738
if(debug){
739
fprintf(stderr, "No Mandos server found, still searching...\n");
632
740
}
741
break;
742
}
633
743
}
634
744
635
745
/* Combines file name and path and returns the malloced new
642
752
return NULL;
643
753
}
644
754
if(f_len > 0){
645
memcpy(tmp, first, f_len);
755
memcpy(tmp, first, f_len); /* Spurious warning */
646
756
}
647
757
tmp[f_len] = '/';
648
758
if(s_len > 0){
649
memcpy(tmp + f_len + 1, second, s_len);
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
650
760
}
651
761
tmp[f_len + 1 + s_len] = '\0';
652
762
return tmp;
653
763
}
654
764
655
765
656
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
657
AvahiServerConfig config;
766
int main(int argc, char *argv[]){
658
767
AvahiSServiceBrowser *sb = NULL;
659
768
int error;
660
769
int ret;
661
int debug_int = 0;
662
int returncode = EXIT_SUCCESS;
663
const char *interface = NULL;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
773
int sd;
774
uid_t uid;
775
gid_t gid;
776
char *connect_to = NULL;
664
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
665
char *connect_to = NULL;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
666
783
667
debug_int = debug ? 1 : 0;
668
while (true){
669
static struct option long_options[] = {
670
{"debug", no_argument, &debug_int, 1},
671
{"connect", required_argument, NULL, 'C'},
672
{"interface", required_argument, NULL, 'i'},
673
{"keydir", required_argument, NULL, 'd'},
674
{"seckey", required_argument, NULL, 'c'},
675
{"pubkey", required_argument, NULL, 'k'},
676
{"dh-bits", required_argument, NULL, 'D'},
677
{0, 0, 0, 0} };
678
679
int option_index = 0;
680
ret = getopt_long (argc, argv, "i:", long_options,
681
&option_index);
682
683
if (ret == -1){
684
break;
784
{
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
791
.group = 1 },
792
{ .name = "interface", .key = 'i',
793
.arg = "INTERFACE",
794
.doc = "Interface that Avahi will conntect through",
795
.group = 1 },
796
{ .name = "keydir", .key = 'd',
797
.arg = "KEYDIR",
798
.doc = "Directory where the openpgp keyring is",
799
.group = 1 },
800
{ .name = "seckey", .key = 's',
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
803
.group = 1 },
804
{ .name = "pubkey", .key = 'p',
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
807
.group = 2 },
808
{ .name = "dh-bits", .key = 129,
809
.arg = "BITS",
810
.doc = "dh-bits to use in gnutls communication",
811
.group = 2 },
812
{ .name = "priority", .key = 130,
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
815
{ .name = NULL }
816
};
817
818
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
823
switch (key) {
824
case 128:
825
debug = true;
826
break;
827
case 'c':
828
connect_to = arg;
829
break;
830
case 'i':
831
interface = arg;
832
break;
833
case 'd':
834
keydir = arg;
835
break;
836
case 's':
837
seckeyfile = arg;
838
break;
839
case 'p':
840
pubkeyfile = arg;
841
break;
842
case 129:
843
errno = 0;
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
845
if (errno){
846
perror("strtol");
847
exit(EXIT_FAILURE);
848
}
849
break;
850
case 130:
851
mc.priority = arg;
852
break;
853
case ARGP_KEY_ARG:
854
argp_usage (state);
855
break;
856
case ARGP_KEY_END:
857
break;
858
default:
859
return ARGP_ERR_UNKNOWN;
860
}
861
return 0;
685
862
}
686
687
switch(ret){
688
case 0:
689
break;
690
case 'i':
691
interface = optarg;
692
break;
693
case 'C':
694
connect_to = optarg;
695
break;
696
case 'd':
697
keydir = optarg;
698
break;
699
case 'c':
700
pubkeyfile = optarg;
701
break;
702
case 'k':
703
seckeyfile = optarg;
704
break;
705
case 'D':
706
dh_bits = atoi(optarg);
707
break;
708
case '?':
709
break
710
default:
711
exit(EXIT_FAILURE);
863
864
struct argp argp = { .options = options, .parser = parse_opt,
865
.args_doc = "",
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
871
exitcode = EXIT_FAILURE;
872
goto end;
712
873
}
713
874
}
714
debug = debug_int ? true : false;
715
875
716
876
pubkeyfile = combinepath(keydir, pubkeyfile);
717
877
if (pubkeyfile == NULL){
718
878
perror("combinepath");
719
goto exit;
720
}
721
722
if(interface != NULL){
723
if_index = (AvahiIfIndex) if_nametoindex(interface);
724
if(if_index == 0){
725
fprintf(stderr, "No such interface: \"%s\"\n", interface);
726
exit(EXIT_FAILURE);
727
}
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
886
goto end;
887
}
888
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
890
if (ret == -1){
891
fprintf(stderr, "init_gnutls_global\n");
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
897
uid = getuid();
898
gid = getgid();
899
900
ret = setuid(uid);
901
if (ret == -1){
902
perror("setuid");
903
}
904
905
setgid(gid);
906
if (ret == -1){
907
perror("setgid");
908
}
909
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
911
if(if_index == 0){
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
913
exit(EXIT_FAILURE);
728
914
}
729
915
730
916
if(connect_to != NULL){
733
919
char *address = strrchr(connect_to, ':');
734
920
if(address == NULL){
735
921
fprintf(stderr, "No colon in address\n");
736
exit(EXIT_FAILURE);
922
exitcode = EXIT_FAILURE;
923
goto end;
737
924
}
738
925
errno = 0;
739
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
740
927
if(errno){
741
928
perror("Bad port number");
742
exit(EXIT_FAILURE);
929
exitcode = EXIT_FAILURE;
930
goto end;
743
931
}
744
932
*address = '\0';
745
933
address = connect_to;
746
ret = start_mandos_communication(address, port, if_index);
934
ret = start_mandos_communication(address, port, if_index, &mc);
747
935
if(ret < 0){
748
exit(EXIT_FAILURE);
936
exitcode = EXIT_FAILURE;
749
937
} else {
750
exit(EXIT_SUCCESS);
938
exitcode = EXIT_SUCCESS;
751
939
}
940
goto end;
752
941
}
753
942
754
seckeyfile = combinepath(keydir, seckeyfile);
755
if (seckeyfile == NULL){
756
perror("combinepath");
757
goto exit;
943
/* If the interface is down, bring it up */
944
{
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
946
if(sd < 0) {
947
perror("socket");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
953
if(ret == -1){
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
961
if(ret == -1){
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
964
goto end;
965
}
966
}
967
close(sd);
758
968
}
759
969
760
970
if (not debug){
761
971
avahi_set_log_function(empty_log);
762
972
}
763
973
764
/* Initialize the psuedo-RNG */
974
/* Initialize the pseudo-RNG for Avahi */
765
975
srand((unsigned int) time(NULL));
766
767
/* Allocate main loop object */
768
if (!(simple_poll = avahi_simple_poll_new())) {
769
fprintf(stderr, "Failed to create simple poll object.\n");
770
771
goto exit;
772
}
773
774
/* Do not publish any local records */
775
avahi_server_config_init(&config);
776
config.publish_hinfo = 0;
777
config.publish_addresses = 0;
778
config.publish_workstation = 0;
779
config.publish_domain = 0;
780
781
/* Allocate a new server */
782
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
783
&config, NULL, NULL, &error);
784
785
/* Free the configuration data */
786
avahi_server_config_free(&config);
787
788
/* Check if creating the server object succeeded */
789
if (!server) {
790
fprintf(stderr, "Failed to create server: %s\n",
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
791
1007
avahi_strerror(error));
792
returncode = EXIT_FAILURE;
793
goto exit;
1008
exitcode = EXIT_FAILURE;
1009
goto end;
794
1010
}
795
1011
796
/* Create the service browser */
797
sb = avahi_s_service_browser_new(server, if_index,
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
798
1014
AVAHI_PROTO_INET6,
799
1015
"_mandos._tcp", NULL, 0,
800
browse_callback, server);
801
if (!sb) {
1016
browse_callback, &mc);
1017
if (sb == NULL) {
802
1018
fprintf(stderr, "Failed to create service browser: %s\n",
803
avahi_strerror(avahi_server_errno(server)));
804
returncode = EXIT_FAILURE;
805
goto exit;
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
806
1022
}
807
1023
808
1024
/* Run the main loop */
809
1025
810
1026
if (debug){
811
fprintf(stderr, "Starting avahi loop search\n");
1027
fprintf(stderr, "Starting Avahi loop search\n");
812
1028
}
813
1029
814
avahi_simple_poll_loop(simple_poll);
1030
avahi_simple_poll_loop(mc.simple_poll);
815
1031
816
exit:
1032
end:
817
1033
818
1034
if (debug){
819
1035
fprintf(stderr, "%s exiting\n", argv[0]);
820
1036
}
821
1037
822
1038
/* Cleanup things */
823
if (sb)
1039
if (sb != NULL)
824
1040
avahi_s_service_browser_free(sb);
825
1041
826
if (server)
827
avahi_server_free(server);
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
828
1044
829
if (simple_poll)
830
avahi_simple_poll_free(simple_poll);
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
831
1047
free(pubkeyfile);
832
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
833
1054
834
return returncode;
1055
return exitcode;
835
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0