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- Committer: Teddy Hogeborn
- Date: 2008-08-10 00:04:11 UTC
- Revision ID: teddy@fukt.bsnet.se-20080810000411-jt8mg7yqxtj5uzxn
* mandos (version): New variable.
(main): New "--version" option.
(main): New "--version" option.
- 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
25
25
* along with this program. If not, see
26
26
* <http://www.gnu.org/licenses/>.
27
27
*
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
36
#include <stdio.h>
37
#include <assert.h>
38
#include <stdlib.h>
39
#include <time.h>
40
#include <net/if.h> /* if_nametoindex */
41
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_* */
42
77
#include <avahi-core/core.h>
43
78
#include <avahi-core/lookup.h>
44
79
#include <avahi-core/log.h>
46
81
#include <avahi-common/malloc.h>
47
82
#include <avahi-common/error.h>
48
83
49
//mandos client part
50
#include <sys/types.h> /* socket(), inet_pton() */
51
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
52
struct in6_addr, inet_pton() */
53
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
54
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
55
56
#include <unistd.h> /* close() */
57
#include <netinet/in.h>
58
#include <stdbool.h> /* true */
59
#include <string.h> /* memset */
60
#include <arpa/inet.h> /* inet_pton() */
61
#include <iso646.h> /* not */
62
63
// gpgme
64
#include <errno.h> /* perror() */
65
#include <gpgme.h>
66
67
// getopt long
68
#include <getopt.h>
69
70
#ifndef CERT_ROOT
71
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
72
#endif
73
#define CERTFILE CERT_ROOT "openpgp-client.txt"
74
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
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_* */
97
75
98
#define BUFFER_SIZE 256
76
#define DH_BITS 1024
77
99
78
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>";
79
105
106
/* Used for passing in values through the Avahi callback functions */
80
107
typedef struct {
81
gnutls_session_t session;
108
AvahiSimplePoll *simple_poll;
109
AvahiServer *server;
82
110
gnutls_certificate_credentials_t cred;
111
unsigned int dh_bits;
83
112
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet, const char *homedir){
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,
140
const char *homedir){
89
141
gpgme_data_t dh_crypto, dh_plain;
90
142
gpgme_ctx_t ctx;
91
143
gpgme_error_t rc;
92
144
ssize_t ret;
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
95
147
gpgme_engine_info_t engine_info;
96
148
97
149
if (debug){
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
99
151
}
100
152
101
153
/* Init GPGME */
102
154
gpgme_check_version(NULL);
103
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
155
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
156
if (rc != GPG_ERR_NO_ERROR){
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
158
gpgme_strsource(rc), gpgme_strerror(rc));
159
return -1;
160
}
104
161
105
/* Set GPGME home directory */
162
/* Set GPGME home directory for the OpenPGP engine only */
106
163
rc = gpgme_get_engine_info (&engine_info);
107
164
if (rc != GPG_ERR_NO_ERROR){
108
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
118
175
engine_info = engine_info->next;
119
176
}
120
177
if(engine_info == NULL){
121
fprintf(stderr, "Could not set home dir to %s\n", homedir);
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
122
179
return -1;
123
180
}
124
181
125
/* Create new GPGME data buffer from packet buffer */
126
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);
127
185
if (rc != GPG_ERR_NO_ERROR){
128
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
129
187
gpgme_strsource(rc), gpgme_strerror(rc));
135
193
if (rc != GPG_ERR_NO_ERROR){
136
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
137
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
gpgme_data_release(dh_crypto);
138
197
return -1;
139
198
}
140
199
143
202
if (rc != GPG_ERR_NO_ERROR){
144
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
145
204
gpgme_strsource(rc), gpgme_strerror(rc));
146
return -1;
205
plaintext_length = -1;
206
goto decrypt_end;
147
207
}
148
208
149
/* Decrypt data from the FILE pointer to the plaintext data
150
buffer */
209
/* Decrypt data from the cryptotext data buffer to the plaintext
210
data buffer */
151
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
152
212
if (rc != GPG_ERR_NO_ERROR){
153
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
154
214
gpgme_strsource(rc), gpgme_strerror(rc));
155
return -1;
215
plaintext_length = -1;
216
goto decrypt_end;
156
217
}
157
218
158
219
if(debug){
159
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
160
221
}
161
222
162
223
if (debug){
163
224
gpgme_decrypt_result_t result;
164
225
result = gpgme_op_decrypt_result(ctx);
188
249
}
189
250
}
190
251
191
/* Delete the GPGME FILE pointer cryptotext data buffer */
192
gpgme_data_release(dh_crypto);
193
194
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
195
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
196
197
*new_packet = 0;
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
255
plaintext_length = -1;
256
goto decrypt_end;
257
}
258
259
*plaintext = NULL;
198
260
while(true){
199
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
200
*new_packet = realloc(*new_packet,
201
(unsigned int)new_packet_capacity
202
+ BUFFER_SIZE);
203
if (*new_packet == NULL){
204
perror("realloc");
205
return -1;
206
}
207
new_packet_capacity += BUFFER_SIZE;
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;
208
268
}
209
269
210
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
211
271
BUFFER_SIZE);
212
272
/* Print the data, if any */
213
273
if (ret == 0){
274
/* EOF */
214
275
break;
215
276
}
216
277
if(ret < 0){
217
278
perror("gpgme_data_read");
218
return -1;
279
plaintext_length = -1;
280
goto decrypt_end;
219
281
}
220
new_packet_length += ret;
282
plaintext_length += ret;
221
283
}
222
284
223
/* FIXME: check characters before printing to screen so to not print
224
terminal control characters */
225
/* if(debug){ */
226
/* fprintf(stderr, "decrypted password is: "); */
227
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
228
/* fprintf(stderr, "\n"); */
229
/* } */
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);
230
297
231
298
/* Delete the GPGME plaintext data buffer */
232
299
gpgme_data_release(dh_plain);
233
return new_packet_length;
300
return plaintext_length;
234
301
}
235
302
236
303
static const char * safer_gnutls_strerror (int value) {
240
307
return ret;
241
308
}
242
309
243
void debuggnutls(__attribute__((unused)) int level,
244
const char* string){
245
fprintf(stderr, "%s", string);
310
/* GnuTLS log function callback */
311
static void debuggnutls(__attribute__((unused)) int level,
312
const char* string){
313
fprintf(stderr, "GnuTLS: %s", string);
246
314
}
247
315
248
int initgnutls(encrypted_session *es){
249
const char *err;
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
250
319
int ret;
251
320
252
321
if(debug){
253
322
fprintf(stderr, "Initializing GnuTLS\n");
254
323
}
255
324
256
if ((ret = gnutls_global_init ())
257
!= GNUTLS_E_SUCCESS) {
258
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
325
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
259
329
return -1;
260
330
}
261
331
262
332
if (debug){
333
/* "Use a log level over 10 to enable all debugging options."
334
* - GnuTLS manual
335
*/
263
336
gnutls_global_set_log_level(11);
264
337
gnutls_global_set_log_function(debuggnutls);
265
338
}
266
339
267
/* openpgp credentials */
268
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
269
!= GNUTLS_E_SUCCESS) {
270
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",
271
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
272
346
return -1;
273
347
}
274
348
275
349
if(debug){
276
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
277
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
278
KEYFILE);
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
279
353
}
280
354
281
355
ret = gnutls_certificate_set_openpgp_key_file
282
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
283
357
if (ret != GNUTLS_E_SUCCESS) {
284
fprintf
285
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
286
" '%s')\n",
287
ret, CERTFILE, KEYFILE);
288
fprintf(stdout, "The Error is: %s\n",
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",
289
362
safer_gnutls_strerror(ret));
290
return -1;
291
}
292
293
//GnuTLS server initialization
294
if ((ret = gnutls_dh_params_init (&es->dh_params))
295
!= GNUTLS_E_SUCCESS) {
296
fprintf (stderr, "Error in dh parameter initialization: %s\n",
297
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "Error in prime generation: %s\n",
304
safer_gnutls_strerror(ret));
305
return -1;
306
}
307
308
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
309
310
// GnuTLS session creation
311
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
312
!= GNUTLS_E_SUCCESS){
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){
313
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
314
399
safer_gnutls_strerror(ret));
315
400
}
316
401
317
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
318
!= GNUTLS_E_SUCCESS) {
319
fprintf(stderr, "Syntax error at: %s\n", err);
320
fprintf(stderr, "GnuTLS error: %s\n",
321
safer_gnutls_strerror(ret));
322
return -1;
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
}
323
412
}
324
413
325
if ((ret = gnutls_credentials_set
326
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
327
!= GNUTLS_E_SUCCESS) {
328
fprintf(stderr, "Error setting a credentials set: %s\n",
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",
329
418
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
330
420
return -1;
331
421
}
332
422
333
423
/* ignore client certificate if any. */
334
gnutls_certificate_server_set_request (es->session,
424
gnutls_certificate_server_set_request (*session,
335
425
GNUTLS_CERT_IGNORE);
336
426
337
gnutls_dh_set_prime_bits (es->session, DH_BITS);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
338
428
339
429
return 0;
340
430
}
341
431
342
void empty_log(__attribute__((unused)) AvahiLogLevel level,
343
__attribute__((unused)) const char *txt){}
432
/* Avahi log function callback */
433
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
434
__attribute__((unused)) const char *txt){}
344
435
345
int start_mandos_communication(const char *ip, uint16_t port,
346
unsigned int if_index){
436
/* Called when a Mandos server is found */
437
static int start_mandos_communication(const char *ip, uint16_t port,
438
AvahiIfIndex if_index,
439
mandos_context *mc){
347
440
int ret, tcp_sd;
348
struct sockaddr_in6 to;
349
encrypted_session es;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
350
442
char *buffer = NULL;
351
443
char *decrypted_buffer;
352
444
size_t buffer_length = 0;
353
445
size_t buffer_capacity = 0;
354
446
ssize_t decrypted_buffer_size;
355
size_t written = 0;
447
size_t written;
356
448
int retval = 0;
357
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
}
358
456
359
457
if(debug){
360
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
366
464
perror("socket");
367
465
return -1;
368
466
}
369
370
if(if_indextoname(if_index, interface) == NULL){
371
if(debug){
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
372
470
perror("if_indextoname");
471
return -1;
373
472
}
374
return -1;
375
}
376
377
if(debug){
378
473
fprintf(stderr, "Binding to interface %s\n", interface);
379
474
}
380
475
381
476
memset(&to,0,sizeof(to)); /* Spurious warning */
382
to.sin6_family = AF_INET6;
383
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);
384
481
if (ret < 0 ){
385
482
perror("inet_pton");
386
483
return -1;
387
}
484
}
388
485
if(ret == 0){
389
486
fprintf(stderr, "Bad address: %s\n", ip);
390
487
return -1;
391
488
}
392
to.sin6_port = htons(port); /* Spurious warning */
489
to.in6.sin6_port = htons(port); /* Spurious warning */
393
490
394
to.sin6_scope_id = (uint32_t)if_index;
491
to.in6.sin6_scope_id = (uint32_t)if_index;
395
492
396
493
if(debug){
397
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
398
/* char addrstr[INET6_ADDRSTRLEN]; */
399
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
400
/* sizeof(addrstr)) == NULL){ */
401
/* perror("inet_ntop"); */
402
/* } else { */
403
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
404
/* addrstr, ntohs(to.sin6_port)); */
405
/* } */
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
}
406
504
}
407
505
408
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
506
ret = connect(tcp_sd, &to.in, sizeof(to));
409
507
if (ret < 0){
410
508
perror("connect");
411
509
return -1;
412
510
}
413
414
ret = initgnutls (&es);
415
if (ret != 0){
416
retval = -1;
417
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
}
418
534
}
419
420
gnutls_transport_set_ptr (es.session,
421
(gnutls_transport_ptr_t) tcp_sd);
422
535
423
536
if(debug){
424
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
425
538
}
426
539
427
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);
428
545
429
546
if (ret != GNUTLS_E_SUCCESS){
430
547
if(debug){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
432
549
gnutls_perror (ret);
433
550
}
434
551
retval = -1;
435
goto exit;
552
goto mandos_end;
436
553
}
437
554
438
//Retrieve OpenPGP packet that contains the wanted password
555
/* Read OpenPGP packet that contains the wanted password */
439
556
440
557
if(debug){
441
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
443
560
}
444
561
445
562
while(true){
446
if (buffer_length + BUFFER_SIZE > buffer_capacity){
447
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
448
if (buffer == NULL){
449
perror("realloc");
450
goto exit;
451
}
452
buffer_capacity += BUFFER_SIZE;
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;
453
569
}
454
570
455
ret = gnutls_record_recv
456
(es.session, buffer+buffer_length, BUFFER_SIZE);
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
457
573
if (ret == 0){
458
574
break;
459
575
}
463
579
case GNUTLS_E_AGAIN:
464
580
break;
465
581
case GNUTLS_E_REHANDSHAKE:
466
ret = gnutls_handshake (es.session);
582
do{
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
467
585
if (ret < 0){
468
fprintf(stderr, "\n*** Handshake failed ***\n");
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
469
587
gnutls_perror (ret);
470
588
retval = -1;
471
goto exit;
589
goto mandos_end;
472
590
}
473
591
break;
474
592
default:
475
593
fprintf(stderr, "Unknown error while reading data from"
476
" encrypted session with mandos server\n");
594
" encrypted session with Mandos server\n");
477
595
retval = -1;
478
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
479
goto exit;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
597
goto mandos_end;
480
598
}
481
599
} else {
482
600
buffer_length += (size_t) ret;
483
601
}
484
602
}
485
603
604
if(debug){
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
486
610
if (buffer_length > 0){
487
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
488
612
buffer_length,
489
613
&decrypted_buffer,
490
CERT_ROOT);
614
keydir);
491
615
if (decrypted_buffer_size >= 0){
616
written = 0;
492
617
while(written < (size_t) decrypted_buffer_size){
493
618
ret = (int)fwrite (decrypted_buffer + written, 1,
494
619
(size_t)decrypted_buffer_size - written,
508
633
retval = -1;
509
634
}
510
635
}
511
512
//shutdown procedure
513
514
if(debug){
515
fprintf(stderr, "Closing TLS session\n");
516
}
517
636
637
/* Shutdown procedure */
638
639
mandos_end:
518
640
free(buffer);
519
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
520
exit:
521
641
close(tcp_sd);
522
gnutls_deinit (es.session);
523
gnutls_certificate_free_credentials (es.cred);
524
gnutls_global_deinit ();
642
gnutls_deinit (session);
525
643
return retval;
526
644
}
527
645
528
static AvahiSimplePoll *simple_poll = NULL;
529
static AvahiServer *server = NULL;
530
531
static void resolve_callback(
532
AvahiSServiceResolver *r,
533
AvahiIfIndex interface,
534
AVAHI_GCC_UNUSED AvahiProtocol protocol,
535
AvahiResolverEvent event,
536
const char *name,
537
const char *type,
538
const char *domain,
539
const char *host_name,
540
const AvahiAddress *address,
541
uint16_t port,
542
AVAHI_GCC_UNUSED AvahiStringList *txt,
543
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
544
AVAHI_GCC_UNUSED void* userdata) {
545
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;
546
661
assert(r); /* Spurious warning */
547
662
548
663
/* Called whenever a service has been resolved successfully or
551
666
switch (event) {
552
667
default:
553
668
case AVAHI_RESOLVER_FAILURE:
554
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
555
" type '%s' in domain '%s': %s\n", name, type, domain,
556
avahi_strerror(avahi_server_errno(server)));
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)));
557
672
break;
558
673
559
674
case AVAHI_RESOLVER_FOUND:
561
676
char ip[AVAHI_ADDRESS_STR_MAX];
562
677
avahi_address_snprint(ip, sizeof(ip), address);
563
678
if(debug){
564
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
565
" 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);
566
681
}
567
int ret = start_mandos_communication(ip, port,
568
(unsigned int) interface);
682
int ret = start_mandos_communication(ip, port, interface, mc);
569
683
if (ret == 0){
570
684
exit(EXIT_SUCCESS);
571
685
}
574
688
avahi_s_service_resolver_free(r);
575
689
}
576
690
577
static void browse_callback(
578
AvahiSServiceBrowser *b,
579
AvahiIfIndex interface,
580
AvahiProtocol protocol,
581
AvahiBrowserEvent event,
582
const char *name,
583
const char *type,
584
const char *domain,
585
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
586
void* userdata) {
587
588
AvahiServer *s = userdata;
589
assert(b); /* Spurious warning */
590
591
/* Called whenever a new services becomes available on the LAN or
592
is removed from the LAN */
593
594
switch (event) {
595
default:
596
case AVAHI_BROWSER_FAILURE:
597
598
fprintf(stderr, "(Browser) %s\n",
599
avahi_strerror(avahi_server_errno(server)));
600
avahi_simple_poll_quit(simple_poll);
601
return;
602
603
case AVAHI_BROWSER_NEW:
604
/* We ignore the returned resolver object. In the callback
605
function we free it. If the server is terminated before
606
the callback function is called the server will free
607
the resolver for us. */
608
609
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
610
type, domain,
611
AVAHI_PROTO_INET6, 0,
612
resolve_callback, s)))
613
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
614
avahi_strerror(avahi_server_errno(s)));
615
break;
616
617
case AVAHI_BROWSER_REMOVE:
618
break;
619
620
case AVAHI_BROWSER_ALL_FOR_NOW:
621
case AVAHI_BROWSER_CACHE_EXHAUSTED:
622
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");
623
737
}
624
}
625
626
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
627
AvahiServerConfig config;
738
break;
739
}
740
}
741
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
748
if (tmp == NULL){
749
return NULL;
750
}
751
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
753
}
754
tmp[f_len] = '/';
755
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
757
}
758
tmp[f_len + 1 + s_len] = '\0';
759
return tmp;
760
}
761
762
763
int main(int argc, char *argv[]){
628
764
AvahiSServiceBrowser *sb = NULL;
629
765
int error;
630
766
int ret;
631
int returncode = EXIT_SUCCESS;
767
int exitcode = EXIT_SUCCESS;
632
768
const char *interface = "eth0";
633
unsigned int if_index;
769
struct ifreq network;
770
int sd;
771
uid_t uid;
772
gid_t gid;
634
773
char *connect_to = NULL;
635
636
while (true){
637
static struct option long_options[] = {
638
{"debug", no_argument, (int *)&debug, 1},
639
{"connect", required_argument, 0, 'c'},
640
{"interface", required_argument, 0, 'i'},
641
{0, 0, 0, 0} };
642
643
int option_index = 0;
644
ret = getopt_long (argc, argv, "i:", long_options,
645
&option_index);
646
647
if (ret == -1){
648
break;
649
}
650
651
switch(ret){
652
case 0:
653
break;
654
case 'i':
655
interface = optarg;
656
break;
657
case 'c':
658
connect_to = optarg;
659
break;
660
default:
661
exit(EXIT_FAILURE);
662
}
663
}
664
665
if_index = if_nametoindex(interface);
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
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);
666
908
if(if_index == 0){
667
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
668
910
exit(EXIT_FAILURE);
674
916
char *address = strrchr(connect_to, ':');
675
917
if(address == NULL){
676
918
fprintf(stderr, "No colon in address\n");
677
exit(EXIT_FAILURE);
919
exitcode = EXIT_FAILURE;
920
goto end;
678
921
}
679
922
errno = 0;
680
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
681
924
if(errno){
682
925
perror("Bad port number");
683
exit(EXIT_FAILURE);
926
exitcode = EXIT_FAILURE;
927
goto end;
684
928
}
685
929
*address = '\0';
686
930
address = connect_to;
687
ret = start_mandos_communication(address, port, if_index);
931
ret = start_mandos_communication(address, port, if_index, &mc);
688
932
if(ret < 0){
689
exit(EXIT_FAILURE);
933
exitcode = EXIT_FAILURE;
690
934
} else {
691
exit(EXIT_SUCCESS);
692
}
935
exitcode = EXIT_SUCCESS;
936
}
937
goto end;
938
}
939
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);
693
965
}
694
966
695
967
if (not debug){
696
968
avahi_set_log_function(empty_log);
697
969
}
698
970
699
/* Initialize the psuedo-RNG */
971
/* Initialize the pseudo-RNG for Avahi */
700
972
srand((unsigned int) time(NULL));
701
702
/* Allocate main loop object */
703
if (!(simple_poll = avahi_simple_poll_new())) {
704
fprintf(stderr, "Failed to create simple poll object.\n");
705
706
goto exit;
707
}
708
709
/* Do not publish any local records */
710
avahi_server_config_init(&config);
711
config.publish_hinfo = 0;
712
config.publish_addresses = 0;
713
config.publish_workstation = 0;
714
config.publish_domain = 0;
715
716
/* Allocate a new server */
717
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
718
&config, NULL, NULL, &error);
719
720
/* Free the configuration data */
721
avahi_server_config_free(&config);
722
723
/* Check if creating the server object succeeded */
724
if (!server) {
725
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",
726
1004
avahi_strerror(error));
727
returncode = EXIT_FAILURE;
728
goto exit;
1005
exitcode = EXIT_FAILURE;
1006
goto end;
729
1007
}
730
1008
731
/* Create the service browser */
732
sb = avahi_s_service_browser_new(server, (AvahiIfIndex)if_index,
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
733
1011
AVAHI_PROTO_INET6,
734
1012
"_mandos._tcp", NULL, 0,
735
browse_callback, server);
736
if (!sb) {
1013
browse_callback, &mc);
1014
if (sb == NULL) {
737
1015
fprintf(stderr, "Failed to create service browser: %s\n",
738
avahi_strerror(avahi_server_errno(server)));
739
returncode = EXIT_FAILURE;
740
goto exit;
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
741
1019
}
742
1020
743
1021
/* Run the main loop */
744
1022
745
1023
if (debug){
746
fprintf(stderr, "Starting avahi loop search\n");
1024
fprintf(stderr, "Starting Avahi loop search\n");
747
1025
}
748
1026
749
avahi_simple_poll_loop(simple_poll);
1027
avahi_simple_poll_loop(mc.simple_poll);
750
1028
751
exit:
1029
end:
752
1030
753
1031
if (debug){
754
1032
fprintf(stderr, "%s exiting\n", argv[0]);
755
1033
}
756
1034
757
1035
/* Cleanup things */
758
if (sb)
1036
if (sb != NULL)
759
1037
avahi_s_service_browser_free(sb);
760
1038
761
if (server)
762
avahi_server_free(server);
763
764
if (simple_poll)
765
avahi_simple_poll_free(simple_poll);
766
767
return returncode;
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
}
1051
1052
return exitcode;
768
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0