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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:17:32 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815201732-b7uux3yqs05b3fy9
Added configuration files support for mandos-client
Removed plus argument support for mandos-client
Removed plus argument support for mandos-client
- files added:
- COPYING
- 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 <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
SIOCSIFFLAGS, if_indextoname(),
60
if_nametoindex(), IF_NAMESIZE */
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
67
#include <argp.h> /* struct argp_option, error_t, struct
68
argp_state, struct argp,
69
argp_parse(), ARGP_KEY_ARG,
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
71
72
/* Avahi */
73
/* All Avahi types, constants and functions
74
Avahi*, avahi_*,
75
AVAHI_* */
41
76
#include <avahi-core/core.h>
42
77
#include <avahi-core/lookup.h>
43
78
#include <avahi-core/log.h>
45
80
#include <avahi-common/malloc.h>
46
81
#include <avahi-common/error.h>
47
82
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>
83
/* GnuTLS */
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
85
gnutls_*
86
init_gnutls_session(),
87
GNUTLS_* */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
89
GNUTLS_OPENPGP_FMT_BASE64 */
90
91
/* GPGME */
92
#include <gpgme.h> /* All GPGME types, constants and functions
93
gpgme_*
94
GPGME_PROTOCOL_OpenPGP,
95
GPG_ERR_NO_* */
68
96
69
97
#define BUFFER_SIZE 256
70
98
71
static int dh_bits = 1024;
72
99
bool debug = false;
73
100
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 */
101
static const char mandos_protocol_version[] = "1";
102
const char *argp_program_version = "password-request 1.0";
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
104
105
/* Used for passing in values through the Avahi callback functions */
80
106
typedef struct {
81
gnutls_session_t session;
107
AvahiSimplePoll *simple_poll;
108
AvahiServer *server;
82
109
gnutls_certificate_credentials_t cred;
110
unsigned int dh_bits;
83
111
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,
112
const char *priority;
113
} mandos_context;
114
115
/*
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
118
* "buffer_length" is how much is already used.
119
*/
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
121
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
124
if (buffer == NULL){
125
return 0;
126
}
127
buffer_capacity += BUFFER_SIZE;
128
}
129
return buffer_capacity;
130
}
131
132
/*
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
135
*/
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
89
139
const char *homedir){
90
140
gpgme_data_t dh_crypto, dh_plain;
91
141
gpgme_ctx_t ctx;
92
142
gpgme_error_t rc;
93
143
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
96
146
gpgme_engine_info_t engine_info;
97
147
98
148
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
100
150
}
101
151
102
152
/* Init GPGME */
108
158
return -1;
109
159
}
110
160
111
/* Set GPGME home directory */
161
/* Set GPGME home directory for the OpenPGP engine only */
112
162
rc = gpgme_get_engine_info (&engine_info);
113
163
if (rc != GPG_ERR_NO_ERROR){
114
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
124
174
engine_info = engine_info->next;
125
175
}
126
176
if(engine_info == NULL){
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
128
178
return -1;
129
179
}
130
180
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
181
/* Create new GPGME data buffer from memory cryptotext */
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
183
0);
133
184
if (rc != GPG_ERR_NO_ERROR){
134
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
135
186
gpgme_strsource(rc), gpgme_strerror(rc));
141
192
if (rc != GPG_ERR_NO_ERROR){
142
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
143
194
gpgme_strsource(rc), gpgme_strerror(rc));
195
gpgme_data_release(dh_crypto);
144
196
return -1;
145
197
}
146
198
149
201
if (rc != GPG_ERR_NO_ERROR){
150
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
151
203
gpgme_strsource(rc), gpgme_strerror(rc));
152
return -1;
204
plaintext_length = -1;
205
goto decrypt_end;
153
206
}
154
207
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
208
/* Decrypt data from the cryptotext data buffer to the plaintext
209
data buffer */
157
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
158
211
if (rc != GPG_ERR_NO_ERROR){
159
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
160
213
gpgme_strsource(rc), gpgme_strerror(rc));
161
return -1;
214
plaintext_length = -1;
215
goto decrypt_end;
162
216
}
163
217
164
218
if(debug){
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
166
220
}
167
221
168
222
if (debug){
169
223
gpgme_decrypt_result_t result;
170
224
result = gpgme_op_decrypt_result(ctx);
173
227
} else {
174
228
fprintf(stderr, "Unsupported algorithm: %s\n",
175
229
result->unsupported_algorithm);
176
fprintf(stderr, "Wrong key usage: %d\n",
230
fprintf(stderr, "Wrong key usage: %u\n",
177
231
result->wrong_key_usage);
178
232
if(result->file_name != NULL){
179
233
fprintf(stderr, "File name: %s\n", result->file_name);
194
248
}
195
249
}
196
250
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
199
200
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
201
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
253
perror("pgpme_data_seek");
254
plaintext_length = -1;
255
goto decrypt_end;
203
256
}
204
257
205
*new_packet = 0;
258
*plaintext = NULL;
206
259
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;
260
plaintext_capacity = adjustbuffer(plaintext,
261
(size_t)plaintext_length,
262
plaintext_capacity);
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
265
plaintext_length = -1;
266
goto decrypt_end;
216
267
}
217
268
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
270
BUFFER_SIZE);
220
271
/* Print the data, if any */
221
272
if (ret == 0){
273
/* EOF */
222
274
break;
223
275
}
224
276
if(ret < 0){
225
277
perror("gpgme_data_read");
226
return -1;
278
plaintext_length = -1;
279
goto decrypt_end;
227
280
}
228
new_packet_length += ret;
281
plaintext_length += ret;
229
282
}
230
283
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
/* } */
284
if(debug){
285
fprintf(stderr, "Decrypted password is: ");
286
for(ssize_t i = 0; i < plaintext_length; i++){
287
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
288
}
289
fprintf(stderr, "\n");
290
}
291
292
decrypt_end:
293
294
/* Delete the GPGME cryptotext data buffer */
295
gpgme_data_release(dh_crypto);
238
296
239
297
/* Delete the GPGME plaintext data buffer */
240
298
gpgme_data_release(dh_plain);
241
return new_packet_length;
299
return plaintext_length;
242
300
}
243
301
244
302
static const char * safer_gnutls_strerror (int value) {
248
306
return ret;
249
307
}
250
308
309
/* GnuTLS log function callback */
251
310
static void debuggnutls(__attribute__((unused)) int level,
252
311
const char* string){
253
fprintf(stderr, "%s", string);
312
fprintf(stderr, "GnuTLS: %s", string);
254
313
}
255
314
256
static int initgnutls(encrypted_session *es){
257
const char *err;
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
258
318
int ret;
259
319
260
320
if(debug){
261
321
fprintf(stderr, "Initializing GnuTLS\n");
262
322
}
263
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
323
324
ret = gnutls_global_init();
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
267
328
return -1;
268
329
}
269
330
270
331
if (debug){
332
/* "Use a log level over 10 to enable all debugging options."
333
* - GnuTLS manual
334
*/
271
335
gnutls_global_set_log_level(11);
272
336
gnutls_global_set_log_function(debuggnutls);
273
337
}
274
338
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
339
/* OpenPGP credentials */
340
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
279
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
280
345
return -1;
281
346
}
282
347
287
352
}
288
353
289
354
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
291
356
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",
357
fprintf(stderr,
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
297
361
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){
362
goto globalfail;
363
}
364
365
/* GnuTLS server initialization */
366
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
370
goto globalfail;
371
}
372
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
376
goto globalfail;
377
}
378
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
381
return 0;
382
383
globalfail:
384
385
gnutls_certificate_free_credentials(mc->cred);
386
gnutls_global_deinit();
387
return -1;
388
389
}
390
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
393
int ret;
394
/* GnuTLS session creation */
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
321
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
398
safer_gnutls_strerror(ret));
323
399
}
324
400
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;
401
{
402
const char *err;
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
405
fprintf(stderr, "Syntax error at: %s\n", err);
406
fprintf(stderr, "GnuTLS error: %s\n",
407
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
409
return -1;
410
}
331
411
}
332
412
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",
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
337
417
safer_gnutls_strerror(ret));
418
gnutls_deinit (*session);
338
419
return -1;
339
420
}
340
421
341
422
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
423
gnutls_certificate_server_set_request (*session,
343
424
GNUTLS_CERT_IGNORE);
344
425
345
gnutls_dh_set_prime_bits (es->session, dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
346
427
347
428
return 0;
348
429
}
349
430
431
/* Avahi log function callback */
350
432
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
433
__attribute__((unused)) const char *txt){}
352
434
435
/* Called when a Mandos server is found */
353
436
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
437
AvahiIfIndex if_index,
438
mandos_context *mc){
355
439
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
358
441
char *buffer = NULL;
359
442
char *decrypted_buffer;
360
443
size_t buffer_length = 0;
361
444
size_t buffer_capacity = 0;
362
445
ssize_t decrypted_buffer_size;
363
size_t written = 0;
446
size_t written;
364
447
int retval = 0;
365
448
char interface[IF_NAMESIZE];
449
gnutls_session_t session;
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
453
return -1;
454
}
366
455
367
456
if(debug){
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
369
ip, port);
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
458
"\n", ip, port);
370
459
}
371
460
372
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
374
463
perror("socket");
375
464
return -1;
376
465
}
377
378
if(if_indextoname((unsigned int)if_index, interface) == NULL){
379
if(debug){
466
467
if(debug){
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
380
469
perror("if_indextoname");
470
return -1;
381
471
}
382
return -1;
383
}
384
385
if(debug){
386
472
fprintf(stderr, "Binding to interface %s\n", interface);
387
473
}
388
474
389
475
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
392
480
if (ret < 0 ){
393
481
perror("inet_pton");
394
482
return -1;
395
}
483
}
396
484
if(ret == 0){
397
485
fprintf(stderr, "Bad address: %s\n", ip);
398
486
return -1;
399
487
}
400
to.sin6_port = htons(port); /* Spurious warning */
488
to.in6.sin6_port = htons(port); /* Spurious warning */
401
489
402
to.sin6_scope_id = (uint32_t)if_index;
490
to.in6.sin6_scope_id = (uint32_t)if_index;
403
491
404
492
if(debug){
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
port);
406
495
char addrstr[INET6_ADDRSTRLEN] = "";
407
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
408
497
sizeof(addrstr)) == NULL){
409
498
perror("inet_ntop");
410
499
} else {
411
500
if(strcmp(addrstr, ip) != 0){
412
fprintf(stderr, "Canonical address form: %s\n",
413
addrstr, ntohs(to.sin6_port));
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
414
502
}
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 (&es);
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
}
428
534
}
429
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
432
535
433
536
if(debug){
434
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
435
538
}
436
539
437
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);
438
545
439
546
if (ret != GNUTLS_E_SUCCESS){
440
547
if(debug){
441
fprintf(stderr, "\n*** Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
442
549
gnutls_perror (ret);
443
550
}
444
551
retval = -1;
445
goto exit;
552
goto mandos_end;
446
553
}
447
554
448
//Retrieve OpenPGP packet that contains the wanted password
555
/* Read OpenPGP packet that contains the wanted password */
449
556
450
557
if(debug){
451
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
453
560
}
454
561
455
562
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;
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;
463
569
}
464
570
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
467
573
if (ret == 0){
468
574
break;
469
575
}
473
579
case GNUTLS_E_AGAIN:
474
580
break;
475
581
case GNUTLS_E_REHANDSHAKE:
476
ret = gnutls_handshake (es.session);
582
do{
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
477
585
if (ret < 0){
478
fprintf(stderr, "\n*** Handshake failed ***\n");
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
479
587
gnutls_perror (ret);
480
588
retval = -1;
481
goto exit;
589
goto mandos_end;
482
590
}
483
591
break;
484
592
default:
485
593
fprintf(stderr, "Unknown error while reading data from"
486
" encrypted session with mandos server\n");
594
" encrypted session with Mandos server\n");
487
595
retval = -1;
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
489
goto exit;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
597
goto mandos_end;
490
598
}
491
599
} else {
492
600
buffer_length += (size_t) ret;
493
601
}
494
602
}
495
603
604
if(debug){
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
496
610
if (buffer_length > 0){
497
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
498
612
buffer_length,
499
613
&decrypted_buffer,
500
614
keydir);
501
615
if (decrypted_buffer_size >= 0){
616
written = 0;
502
617
while(written < (size_t) decrypted_buffer_size){
503
618
ret = (int)fwrite (decrypted_buffer + written, 1,
504
619
(size_t)decrypted_buffer_size - written,
518
633
retval = -1;
519
634
}
520
635
}
521
522
//shutdown procedure
523
524
if(debug){
525
fprintf(stderr, "Closing TLS session\n");
526
}
527
636
637
/* Shutdown procedure */
638
639
mandos_end:
528
640
free(buffer);
529
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
530
exit:
531
641
close(tcp_sd);
532
gnutls_deinit (es.session);
533
gnutls_certificate_free_credentials (es.cred);
534
gnutls_global_deinit ();
642
gnutls_deinit (session);
535
643
return retval;
536
644
}
537
645
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
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;
556
661
assert(r); /* Spurious warning */
557
662
558
663
/* Called whenever a service has been resolved successfully or
561
666
switch (event) {
562
667
default:
563
668
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)));
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)));
567
672
break;
568
673
569
674
case AVAHI_RESOLVER_FOUND:
571
676
char ip[AVAHI_ADDRESS_STR_MAX];
572
677
avahi_address_snprint(ip, sizeof(ip), address);
573
678
if(debug){
574
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
575
" port %d\n", name, host_name, ip, port);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
576
682
}
577
int ret = start_mandos_communication(ip, port, interface);
683
int ret = start_mandos_communication(ip, port, interface, mc);
578
684
if (ret == 0){
579
exit(EXIT_SUCCESS);
685
avahi_simple_poll_quit(mc->simple_poll);
580
686
}
581
687
}
582
688
}
583
689
avahi_s_service_resolver_free(r);
584
690
}
585
691
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;
692
static void browse_callback( AvahiSServiceBrowser *b,
693
AvahiIfIndex interface,
694
AvahiProtocol protocol,
695
AvahiBrowserEvent event,
696
const char *name,
697
const char *type,
698
const char *domain,
699
AVAHI_GCC_UNUSED AvahiLookupResultFlags
700
flags,
701
void* userdata) {
702
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
704
705
/* Called whenever a new services becomes available on the LAN or
706
is removed from the LAN */
707
708
switch (event) {
709
default:
710
case AVAHI_BROWSER_FAILURE:
711
712
fprintf(stderr, "(Avahi browser) %s\n",
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
715
return;
716
717
case AVAHI_BROWSER_NEW:
718
/* We ignore the returned Avahi resolver object. In the callback
719
function we free it. If the Avahi server is terminated before
720
the callback function is called the Avahi server will free the
721
resolver for us. */
722
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
resolve_callback, mc)))
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
728
name, avahi_strerror(avahi_server_errno(mc->server)));
729
break;
730
731
case AVAHI_BROWSER_REMOVE:
732
break;
733
734
case AVAHI_BROWSER_ALL_FOR_NOW:
735
case AVAHI_BROWSER_CACHE_EXHAUSTED:
736
if(debug){
737
fprintf(stderr, "No Mandos server found, still searching...\n");
632
738
}
739
break;
740
}
633
741
}
634
742
635
743
/* Combines file name and path and returns the malloced new
642
750
return NULL;
643
751
}
644
752
if(f_len > 0){
645
memcpy(tmp, first, f_len);
753
memcpy(tmp, first, f_len); /* Spurious warning */
646
754
}
647
755
tmp[f_len] = '/';
648
756
if(s_len > 0){
649
memcpy(tmp + f_len + 1, second, s_len);
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
650
758
}
651
759
tmp[f_len + 1 + s_len] = '\0';
652
760
return tmp;
653
761
}
654
762
655
763
656
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
657
AvahiServerConfig config;
764
int main(int argc, char *argv[]){
658
765
AvahiSServiceBrowser *sb = NULL;
659
766
int error;
660
767
int ret;
661
int debug_int = 0;
662
int returncode = EXIT_SUCCESS;
663
const char *interface = NULL;
768
int exitcode = EXIT_SUCCESS;
769
const char *interface = "eth0";
770
struct ifreq network;
771
int sd;
772
uid_t uid;
773
gid_t gid;
774
char *connect_to = NULL;
664
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
665
char *connect_to = NULL;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
666
781
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;
782
{
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
789
.group = 1 },
790
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
797
.group = 1 },
798
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
801
.group = 1 },
802
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
805
.group = 2 },
806
{ .name = "dh-bits", .key = 129,
807
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
813
{ .name = NULL }
814
};
815
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
823
debug = true;
824
break;
825
case 'c':
826
connect_to = arg;
827
break;
828
case 'i':
829
interface = arg;
830
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130:
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
685
859
}
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);
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, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
869
goto end;
712
870
}
713
871
}
714
debug = debug_int ? true : false;
715
872
716
873
pubkeyfile = combinepath(keydir, pubkeyfile);
717
874
if (pubkeyfile == NULL){
718
875
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
}
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
892
} else {
893
gnutls_initalized = true;
894
}
895
896
/* If the interface is down, bring it up */
897
{
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
if(sd < 0) {
900
perror("socket");
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
strcpy(network.ifr_name, interface); /* Spurious warning */
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
if(ret == -1){
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
909
goto end;
910
}
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
if(ret == -1){
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
close(sd);
921
}
922
923
uid = getuid();
924
gid = getgid();
925
926
ret = setuid(uid);
927
if (ret == -1){
928
perror("setuid");
929
}
930
931
setgid(gid);
932
if (ret == -1){
933
perror("setgid");
934
}
935
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
937
if(if_index == 0){
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
939
exit(EXIT_FAILURE);
728
940
}
729
941
730
942
if(connect_to != NULL){
733
945
char *address = strrchr(connect_to, ':');
734
946
if(address == NULL){
735
947
fprintf(stderr, "No colon in address\n");
736
exit(EXIT_FAILURE);
948
exitcode = EXIT_FAILURE;
949
goto end;
737
950
}
738
951
errno = 0;
739
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
740
953
if(errno){
741
954
perror("Bad port number");
742
exit(EXIT_FAILURE);
955
exitcode = EXIT_FAILURE;
956
goto end;
743
957
}
744
958
*address = '\0';
745
959
address = connect_to;
746
ret = start_mandos_communication(address, port, if_index);
960
ret = start_mandos_communication(address, port, if_index, &mc);
747
961
if(ret < 0){
748
exit(EXIT_FAILURE);
962
exitcode = EXIT_FAILURE;
749
963
} else {
750
exit(EXIT_SUCCESS);
964
exitcode = EXIT_SUCCESS;
751
965
}
752
}
753
754
seckeyfile = combinepath(keydir, seckeyfile);
755
if (seckeyfile == NULL){
756
perror("combinepath");
757
goto exit;
966
goto end;
758
967
}
759
968
760
969
if (not debug){
761
970
avahi_set_log_function(empty_log);
762
971
}
763
972
764
/* Initialize the psuedo-RNG */
973
/* Initialize the pseudo-RNG for Avahi */
765
974
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",
975
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
980
" object.\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
}
984
985
{
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
993
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
997
NULL, &error);
998
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1001
}
1002
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
791
1006
avahi_strerror(error));
792
returncode = EXIT_FAILURE;
793
goto exit;
1007
exitcode = EXIT_FAILURE;
1008
goto end;
794
1009
}
795
1010
796
/* Create the service browser */
797
sb = avahi_s_service_browser_new(server, if_index,
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
798
1013
AVAHI_PROTO_INET6,
799
1014
"_mandos._tcp", NULL, 0,
800
browse_callback, server);
801
if (!sb) {
1015
browse_callback, &mc);
1016
if (sb == NULL) {
802
1017
fprintf(stderr, "Failed to create service browser: %s\n",
803
avahi_strerror(avahi_server_errno(server)));
804
returncode = EXIT_FAILURE;
805
goto exit;
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1020
goto end;
806
1021
}
807
1022
808
1023
/* Run the main loop */
809
1024
810
1025
if (debug){
811
fprintf(stderr, "Starting avahi loop search\n");
1026
fprintf(stderr, "Starting Avahi loop search\n");
812
1027
}
813
1028
814
avahi_simple_poll_loop(simple_poll);
1029
avahi_simple_poll_loop(mc.simple_poll);
815
1030
816
exit:
1031
end:
817
1032
818
1033
if (debug){
819
1034
fprintf(stderr, "%s exiting\n", argv[0]);
820
1035
}
821
1036
822
1037
/* Cleanup things */
823
if (sb)
1038
if (sb != NULL)
824
1039
avahi_s_service_browser_free(sb);
825
1040
826
if (server)
827
avahi_server_free(server);
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
828
1043
829
if (simple_poll)
830
avahi_simple_poll_free(simple_poll);
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
831
1046
free(pubkeyfile);
832
1047
free(seckeyfile);
1048
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1052
}
833
1053
834
return returncode;
1054
return exitcode;
835
1055
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0