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- Committer: Teddy Hogeborn
- Date: 2008-08-02 21:06:12 UTC
- Revision ID: teddy@fukt.bsnet.se-20080802210612-4c1waup4z0f66ya7
Non-tested commit for merge purposes.
* plugbasedclient.c (getplugin, addargument, set_cloexec): Made static.
* plugins.d/passprompt.c (termination_handler): Made static.
* plugbasedclient.c (getplugin, addargument, set_cloexec): Made static.
* plugins.d/passprompt.c (termination_handler): Made static.
- files added:
- ca.pem
- files removed:
- mandos-client.xml
- files renamed:
- mandos-client.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
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_* */
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
77
41
#include <avahi-core/core.h>
78
42
#include <avahi-core/lookup.h>
79
43
#include <avahi-core/log.h>
81
45
#include <avahi-common/malloc.h>
82
46
#include <avahi-common/error.h>
83
47
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_* */
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>
97
68
98
69
#define BUFFER_SIZE 256
99
70
71
static int dh_bits = 1024;
72
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
76
100
77
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>";
105
78
106
/* Used for passing in values through the Avahi callback functions */
79
/* Used for */
107
80
typedef struct {
108
AvahiSimplePoll *simple_poll;
109
AvahiServer *server;
81
gnutls_session_t session;
110
82
gnutls_certificate_credentials_t cred;
111
unsigned int dh_bits;
112
83
gnutls_dh_params_t dh_params;
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,
84
} encrypted_session;
85
86
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
140
89
const char *homedir){
141
90
gpgme_data_t dh_crypto, dh_plain;
142
91
gpgme_ctx_t ctx;
143
92
gpgme_error_t rc;
144
93
ssize_t ret;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
147
96
gpgme_engine_info_t engine_info;
148
97
149
98
if (debug){
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
151
100
}
152
101
153
102
/* Init GPGME */
159
108
return -1;
160
109
}
161
110
162
/* Set GPGME home directory for the OpenPGP engine only */
111
/* Set GPGME home directory */
163
112
rc = gpgme_get_engine_info (&engine_info);
164
113
if (rc != GPG_ERR_NO_ERROR){
165
114
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
175
124
engine_info = engine_info->next;
176
125
}
177
126
if(engine_info == NULL){
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
179
128
return -1;
180
129
}
181
130
182
/* Create new GPGME data buffer from memory cryptotext */
183
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
184
0);
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
185
133
if (rc != GPG_ERR_NO_ERROR){
186
134
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
187
135
gpgme_strsource(rc), gpgme_strerror(rc));
193
141
if (rc != GPG_ERR_NO_ERROR){
194
142
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
195
143
gpgme_strsource(rc), gpgme_strerror(rc));
196
gpgme_data_release(dh_crypto);
197
144
return -1;
198
145
}
199
146
202
149
if (rc != GPG_ERR_NO_ERROR){
203
150
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
151
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
206
goto decrypt_end;
152
return -1;
207
153
}
208
154
209
/* Decrypt data from the cryptotext data buffer to the plaintext
210
data buffer */
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
211
157
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
158
if (rc != GPG_ERR_NO_ERROR){
213
159
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
214
160
gpgme_strsource(rc), gpgme_strerror(rc));
215
plaintext_length = -1;
216
goto decrypt_end;
161
return -1;
217
162
}
218
163
219
164
if(debug){
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
221
166
}
222
167
223
168
if (debug){
224
169
gpgme_decrypt_result_t result;
225
170
result = gpgme_op_decrypt_result(ctx);
249
194
}
250
195
}
251
196
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
199
252
200
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
201
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
202
perror("pgpme_data_seek");
255
plaintext_length = -1;
256
goto decrypt_end;
257
203
}
258
204
259
*plaintext = NULL;
205
*new_packet = 0;
260
206
while(true){
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;
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;
268
216
}
269
217
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
271
219
BUFFER_SIZE);
272
220
/* Print the data, if any */
273
221
if (ret == 0){
274
/* EOF */
275
222
break;
276
223
}
277
224
if(ret < 0){
278
225
perror("gpgme_data_read");
279
plaintext_length = -1;
280
goto decrypt_end;
226
return -1;
281
227
}
282
plaintext_length += ret;
228
new_packet_length += ret;
283
229
}
284
230
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);
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
/* } */
297
238
298
239
/* Delete the GPGME plaintext data buffer */
299
240
gpgme_data_release(dh_plain);
300
return plaintext_length;
241
return new_packet_length;
301
242
}
302
243
303
244
static const char * safer_gnutls_strerror (int value) {
307
248
return ret;
308
249
}
309
250
310
/* GnuTLS log function callback */
311
251
static void debuggnutls(__attribute__((unused)) int level,
312
252
const char* string){
313
fprintf(stderr, "GnuTLS: %s", string);
253
fprintf(stderr, "%s", string);
314
254
}
315
255
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
256
static int initgnutls(encrypted_session *es){
257
const char *err;
319
258
int ret;
320
259
321
260
if(debug){
322
261
fprintf(stderr, "Initializing GnuTLS\n");
323
262
}
324
325
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
263
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
329
267
return -1;
330
268
}
331
269
332
270
if (debug){
333
/* "Use a log level over 10 to enable all debugging options."
334
* - GnuTLS manual
335
*/
336
271
gnutls_global_set_log_level(11);
337
272
gnutls_global_set_log_function(debuggnutls);
338
273
}
339
274
340
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
344
279
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
346
280
return -1;
347
281
}
348
282
353
287
}
354
288
355
289
ret = gnutls_certificate_set_openpgp_key_file
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
290
(es->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
291
if (ret != GNUTLS_E_SUCCESS) {
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",
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",
362
297
safer_gnutls_strerror(ret));
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){
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){
398
321
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
399
322
safer_gnutls_strerror(ret));
400
323
}
401
324
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
}
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;
412
331
}
413
332
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",
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",
418
337
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
420
338
return -1;
421
339
}
422
340
423
341
/* ignore client certificate if any. */
424
gnutls_certificate_server_set_request (*session,
342
gnutls_certificate_server_set_request (es->session,
425
343
GNUTLS_CERT_IGNORE);
426
344
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
345
gnutls_dh_set_prime_bits (es->session, dh_bits);
428
346
429
347
return 0;
430
348
}
431
349
432
/* Avahi log function callback */
433
350
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
434
351
__attribute__((unused)) const char *txt){}
435
352
436
/* Called when a Mandos server is found */
437
353
static int start_mandos_communication(const char *ip, uint16_t port,
438
AvahiIfIndex if_index,
439
mandos_context *mc){
354
AvahiIfIndex if_index){
440
355
int ret, tcp_sd;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
356
struct sockaddr_in6 to;
357
encrypted_session es;
442
358
char *buffer = NULL;
443
359
char *decrypted_buffer;
444
360
size_t buffer_length = 0;
445
361
size_t buffer_capacity = 0;
446
362
ssize_t decrypted_buffer_size;
447
size_t written;
363
size_t written = 0;
448
364
int retval = 0;
449
365
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
}
456
366
457
367
if(debug){
458
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
464
374
perror("socket");
465
375
return -1;
466
376
}
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
378
if(if_indextoname((unsigned int)if_index, interface) == NULL){
379
if(debug){
470
380
perror("if_indextoname");
471
return -1;
472
381
}
382
return -1;
383
}
384
385
if(debug){
473
386
fprintf(stderr, "Binding to interface %s\n", interface);
474
387
}
475
388
476
389
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
481
392
if (ret < 0 ){
482
393
perror("inet_pton");
483
394
return -1;
484
}
395
}
485
396
if(ret == 0){
486
397
fprintf(stderr, "Bad address: %s\n", ip);
487
398
return -1;
488
399
}
489
to.in6.sin6_port = htons(port); /* Spurious warning */
400
to.sin6_port = htons(port); /* Spurious warning */
490
401
491
to.in6.sin6_scope_id = (uint32_t)if_index;
402
to.sin6_scope_id = (uint32_t)if_index;
492
403
493
404
if(debug){
494
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
406
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
407
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
497
408
sizeof(addrstr)) == NULL){
498
409
perror("inet_ntop");
499
410
} else {
500
411
if(strcmp(addrstr, ip) != 0){
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
412
fprintf(stderr, "Canonical address form: %s\n",
413
addrstr, ntohs(to.sin6_port));
502
414
}
503
415
}
504
416
}
505
417
506
ret = connect(tcp_sd, &to.in, sizeof(to));
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
507
419
if (ret < 0){
508
420
perror("connect");
509
421
return -1;
510
422
}
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
}
423
424
ret = initgnutls (&es);
425
if (ret != 0){
426
retval = -1;
427
return -1;
534
428
}
535
429
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
432
536
433
if(debug){
537
434
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
435
}
539
436
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);
437
ret = gnutls_handshake (es.session);
545
438
546
439
if (ret != GNUTLS_E_SUCCESS){
547
440
if(debug){
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
441
fprintf(stderr, "\n*** Handshake failed ***\n");
549
442
gnutls_perror (ret);
550
443
}
551
444
retval = -1;
552
goto mandos_end;
445
goto exit;
553
446
}
554
447
555
/* Read OpenPGP packet that contains the wanted password */
448
//Retrieve OpenPGP packet that contains the wanted password
556
449
557
450
if(debug){
558
451
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
560
453
}
561
454
562
455
while(true){
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;
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;
569
463
}
570
464
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
573
467
if (ret == 0){
574
468
break;
575
469
}
579
473
case GNUTLS_E_AGAIN:
580
474
break;
581
475
case GNUTLS_E_REHANDSHAKE:
582
do{
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
476
ret = gnutls_handshake (es.session);
585
477
if (ret < 0){
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
478
fprintf(stderr, "\n*** Handshake failed ***\n");
587
479
gnutls_perror (ret);
588
480
retval = -1;
589
goto mandos_end;
481
goto exit;
590
482
}
591
483
break;
592
484
default:
593
485
fprintf(stderr, "Unknown error while reading data from"
594
" encrypted session with Mandos server\n");
486
" encrypted session with mandos server\n");
595
487
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
597
goto mandos_end;
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
489
goto exit;
598
490
}
599
491
} else {
600
492
buffer_length += (size_t) ret;
601
493
}
602
494
}
603
495
604
if(debug){
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
496
if (buffer_length > 0){
611
497
decrypted_buffer_size = pgp_packet_decrypt(buffer,
612
498
buffer_length,
613
499
&decrypted_buffer,
614
500
keydir);
615
501
if (decrypted_buffer_size >= 0){
616
written = 0;
617
502
while(written < (size_t) decrypted_buffer_size){
618
503
ret = (int)fwrite (decrypted_buffer + written, 1,
619
504
(size_t)decrypted_buffer_size - written,
633
518
retval = -1;
634
519
}
635
520
}
636
637
/* Shutdown procedure */
638
639
mandos_end:
521
522
//shutdown procedure
523
524
if(debug){
525
fprintf(stderr, "Closing TLS session\n");
526
}
527
640
528
free(buffer);
529
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
530
exit:
641
531
close(tcp_sd);
642
gnutls_deinit (session);
532
gnutls_deinit (es.session);
533
gnutls_certificate_free_credentials (es.cred);
534
gnutls_global_deinit ();
643
535
return retval;
644
536
}
645
537
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;
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
661
556
assert(r); /* Spurious warning */
662
557
663
558
/* Called whenever a service has been resolved successfully or
666
561
switch (event) {
667
562
default:
668
563
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
672
567
break;
673
568
674
569
case AVAHI_RESOLVER_FOUND:
676
571
char ip[AVAHI_ADDRESS_STR_MAX];
677
572
avahi_address_snprint(ip, sizeof(ip), address);
678
573
if(debug){
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
574
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
575
" port %d\n", name, host_name, ip, port);
681
576
}
682
int ret = start_mandos_communication(ip, port, interface, mc);
577
int ret = start_mandos_communication(ip, port, interface);
683
578
if (ret == 0){
684
579
exit(EXIT_SUCCESS);
685
580
}
688
583
avahi_s_service_resolver_free(r);
689
584
}
690
585
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");
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;
737
632
}
738
break;
739
}
740
633
}
741
634
742
635
/* Combines file name and path and returns the malloced new
749
642
return NULL;
750
643
}
751
644
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
645
memcpy(tmp, first, f_len);
753
646
}
754
647
tmp[f_len] = '/';
755
648
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
649
memcpy(tmp + f_len + 1, second, s_len);
757
650
}
758
651
tmp[f_len + 1 + s_len] = '\0';
759
652
return tmp;
760
653
}
761
654
762
655
763
int main(int argc, char *argv[]){
656
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
657
AvahiServerConfig config;
764
658
AvahiSServiceBrowser *sb = NULL;
765
659
int error;
766
660
int ret;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
770
int sd;
771
uid_t uid;
772
gid_t gid;
661
int debug_int = 0;
662
int returncode = EXIT_SUCCESS;
663
const char *interface = NULL;
664
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
773
665
char *connect_to = NULL;
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
666
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;
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;
859
685
}
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;
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);
870
712
}
871
713
}
872
714
debug = debug_int ? true : false;
715
873
716
pubkeyfile = combinepath(keydir, pubkeyfile);
874
717
if (pubkeyfile == NULL){
875
718
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global\n");
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
uid = getuid();
895
gid = getgid();
896
897
ret = setuid(uid);
898
if (ret == -1){
899
perror("setuid");
900
}
901
902
setgid(gid);
903
if (ret == -1){
904
perror("setgid");
905
}
906
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
908
if(if_index == 0){
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
910
exit(EXIT_FAILURE);
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
}
911
728
}
912
729
913
730
if(connect_to != NULL){
916
733
char *address = strrchr(connect_to, ':');
917
734
if(address == NULL){
918
735
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
920
goto end;
736
exit(EXIT_FAILURE);
921
737
}
922
738
errno = 0;
923
739
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
924
740
if(errno){
925
741
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
927
goto end;
742
exit(EXIT_FAILURE);
928
743
}
929
744
*address = '\0';
930
745
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
746
ret = start_mandos_communication(address, port, if_index);
932
747
if(ret < 0){
933
exitcode = EXIT_FAILURE;
748
exit(EXIT_FAILURE);
934
749
} else {
935
exitcode = EXIT_SUCCESS;
750
exit(EXIT_SUCCESS);
936
751
}
937
goto end;
938
752
}
939
753
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);
754
seckeyfile = combinepath(keydir, seckeyfile);
755
if (seckeyfile == NULL){
756
perror("combinepath");
757
goto exit;
965
758
}
966
759
967
760
if (not debug){
968
761
avahi_set_log_function(empty_log);
969
762
}
970
763
971
/* Initialize the pseudo-RNG for Avahi */
764
/* Initialize the psuedo-RNG */
972
765
srand((unsigned int) time(NULL));
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",
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",
1004
791
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
792
returncode = EXIT_FAILURE;
793
goto exit;
1007
794
}
1008
795
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
796
/* Create the service browser */
797
sb = avahi_s_service_browser_new(server, if_index,
1011
798
AVAHI_PROTO_INET6,
1012
799
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
800
browse_callback, server);
801
if (!sb) {
1015
802
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
803
avahi_strerror(avahi_server_errno(server)));
804
returncode = EXIT_FAILURE;
805
goto exit;
1019
806
}
1020
807
1021
808
/* Run the main loop */
1022
809
1023
810
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
811
fprintf(stderr, "Starting avahi loop search\n");
1025
812
}
1026
813
1027
avahi_simple_poll_loop(mc.simple_poll);
814
avahi_simple_poll_loop(simple_poll);
1028
815
1029
end:
816
exit:
1030
817
1031
818
if (debug){
1032
819
fprintf(stderr, "%s exiting\n", argv[0]);
1033
820
}
1034
821
1035
822
/* Cleanup things */
1036
if (sb != NULL)
823
if (sb)
1037
824
avahi_s_service_browser_free(sb);
1038
825
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
826
if (server)
827
avahi_server_free(server);
1041
828
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
829
if (simple_poll)
830
avahi_simple_poll_free(simple_poll);
1044
831
free(pubkeyfile);
1045
832
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
833
1052
return exitcode;
834
return returncode;
1053
835
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0