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- Committer: Björn Påhlsson
- Date: 2008-08-08 01:31:58 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 50.
- Revision ID: belorn@braxen-20080808013158-weqgqkxni7du1ke5
Added manual pages for:
clients.conf
mandos.conf
mandos
mandos-client
password-prompt
password-request
clients.conf
mandos.conf
mandos
mandos-client
password-prompt
password-request
- files added:
- clients.conf.xml
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- 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
8
8
* includes the following functions: "resolve_callback",
9
9
* "browse_callback", and parts of "main".
10
10
*
11
* Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
12
* Påhlsson.
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
13
13
*
14
14
* This program is free software: you can redistribute it and/or
15
15
* modify it under the terms of the GNU General Public License as
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
#define _FORTIFY_SOURCE 2
33
31
/* Needed by GPGME, specifically gpgme_data_seek() */
34
32
#define _LARGEFILE_SOURCE
35
33
#define _FILE_OFFSET_BITS 64
36
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
37
#include <stdio.h>
38
38
#include <assert.h>
39
39
#include <stdlib.h>
40
40
#include <time.h>
41
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
42
46
43
47
#include <avahi-core/core.h>
44
48
#include <avahi-core/lookup.h>
47
51
#include <avahi-common/malloc.h>
48
52
#include <avahi-common/error.h>
49
53
50
//mandos client part
51
#include <sys/types.h> /* socket(), setsockopt(),
52
inet_pton() */
53
#include <sys/socket.h> /* socket(), setsockopt(),
54
struct sockaddr_in6,
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
57
struct in6_addr, inet_pton() */
56
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
62
64
#include <string.h> /* memset */
63
65
#include <arpa/inet.h> /* inet_pton() */
64
66
#include <iso646.h> /* not */
65
66
// gpgme
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
/* GPGME */
67
72
#include <errno.h> /* perror() */
68
73
#include <gpgme.h>
69
74
70
// getopt long
71
#include <getopt.h>
72
73
#ifndef CERT_ROOT
74
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
75
#endif
76
#define CERTFILE CERT_ROOT "openpgp-client.txt"
77
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
78
75
#define BUFFER_SIZE 256
79
#define DH_BITS 1024
80
76
81
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char mandos_protocol_version[] = "1";
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
82
83
/* Used for passing in values through the Avahi callback functions */
83
84
typedef struct {
84
gnutls_session_t session;
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
85
87
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
86
89
gnutls_dh_params_t dh_params;
87
} encrypted_session;
88
89
90
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
91
char **new_packet, const char *homedir){
90
const char *priority;
91
} mandos_context;
92
93
/*
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
96
* "buffer_length" is how much is already used.
97
*/
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
102
if (buffer == NULL){
103
return 0;
104
}
105
buffer_capacity += BUFFER_SIZE;
106
}
107
return buffer_capacity;
108
}
109
110
/*
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
113
*/
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
92
118
gpgme_data_t dh_crypto, dh_plain;
93
119
gpgme_ctx_t ctx;
94
120
gpgme_error_t rc;
95
121
ssize_t ret;
96
ssize_t new_packet_capacity = 0;
97
ssize_t new_packet_length = 0;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
98
124
gpgme_engine_info_t engine_info;
99
125
100
126
if (debug){
101
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
102
128
}
103
129
104
130
/* Init GPGME */
105
131
gpgme_check_version(NULL);
106
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
137
}
107
138
108
/* Set GPGME home directory */
139
/* Set GPGME home directory for the OpenPGP engine only */
109
140
rc = gpgme_get_engine_info (&engine_info);
110
141
if (rc != GPG_ERR_NO_ERROR){
111
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
121
152
engine_info = engine_info->next;
122
153
}
123
154
if(engine_info == NULL){
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
125
156
return -1;
126
157
}
127
158
128
/* Create new GPGME data buffer from packet buffer */
129
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
130
162
if (rc != GPG_ERR_NO_ERROR){
131
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
132
164
gpgme_strsource(rc), gpgme_strerror(rc));
138
170
if (rc != GPG_ERR_NO_ERROR){
139
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
140
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
141
174
return -1;
142
175
}
143
176
146
179
if (rc != GPG_ERR_NO_ERROR){
147
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
148
181
gpgme_strsource(rc), gpgme_strerror(rc));
149
return -1;
182
plaintext_length = -1;
183
goto decrypt_end;
150
184
}
151
185
152
/* Decrypt data from the FILE pointer to the plaintext data
153
buffer */
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
154
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
155
189
if (rc != GPG_ERR_NO_ERROR){
156
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
157
191
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
192
plaintext_length = -1;
193
goto decrypt_end;
159
194
}
160
195
161
196
if(debug){
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
163
198
}
164
199
165
200
if (debug){
166
201
gpgme_decrypt_result_t result;
167
202
result = gpgme_op_decrypt_result(ctx);
191
226
}
192
227
}
193
228
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
196
197
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
198
gpgme_data_seek(dh_plain, 0, SEEK_SET);
199
200
*new_packet = 0;
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
}
235
236
*plaintext = NULL;
201
237
while(true){
202
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
203
*new_packet = realloc(*new_packet,
204
(unsigned int)new_packet_capacity
205
+ BUFFER_SIZE);
206
if (*new_packet == NULL){
207
perror("realloc");
208
return -1;
209
}
210
new_packet_capacity += BUFFER_SIZE;
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
240
plaintext_capacity);
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
244
goto decrypt_end;
211
245
}
212
246
213
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
214
248
BUFFER_SIZE);
215
249
/* Print the data, if any */
216
250
if (ret == 0){
251
/* EOF */
217
252
break;
218
253
}
219
254
if(ret < 0){
220
255
perror("gpgme_data_read");
221
return -1;
256
plaintext_length = -1;
257
goto decrypt_end;
222
258
}
223
new_packet_length += ret;
259
plaintext_length += ret;
224
260
}
225
261
226
/* FIXME: check characters before printing to screen so to not print
227
terminal control characters */
228
/* if(debug){ */
229
/* fprintf(stderr, "decrypted password is: "); */
230
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
231
/* fprintf(stderr, "\n"); */
232
/* } */
262
if(debug){
263
fprintf(stderr, "Decrypted password is: ");
264
for(ssize_t i = 0; i < plaintext_length; i++){
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
266
}
267
fprintf(stderr, "\n");
268
}
269
270
decrypt_end:
271
272
/* Delete the GPGME cryptotext data buffer */
273
gpgme_data_release(dh_crypto);
233
274
234
275
/* Delete the GPGME plaintext data buffer */
235
276
gpgme_data_release(dh_plain);
236
return new_packet_length;
277
return plaintext_length;
237
278
}
238
279
239
280
static const char * safer_gnutls_strerror (int value) {
243
284
return ret;
244
285
}
245
286
246
void debuggnutls(__attribute__((unused)) int level,
247
const char* string){
248
fprintf(stderr, "%s", string);
287
/* GnuTLS log function callback */
288
static void debuggnutls(__attribute__((unused)) int level,
289
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
249
291
}
250
292
251
int initgnutls(encrypted_session *es){
252
const char *err;
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
253
296
int ret;
254
297
255
298
if(debug){
256
299
fprintf(stderr, "Initializing GnuTLS\n");
257
300
}
258
301
259
302
if ((ret = gnutls_global_init ())
260
303
!= GNUTLS_E_SUCCESS) {
261
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
262
306
return -1;
263
307
}
264
308
265
309
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
266
313
gnutls_global_set_log_level(11);
267
314
gnutls_global_set_log_function(debuggnutls);
268
315
}
269
316
270
/* openpgp credentials */
271
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
272
319
!= GNUTLS_E_SUCCESS) {
273
fprintf (stderr, "memory error: %s\n",
320
fprintf (stderr, "GnuTLS memory error: %s\n",
274
321
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
275
323
return -1;
276
324
}
277
325
278
326
if(debug){
279
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
280
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
281
KEYFILE);
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
282
330
}
283
331
284
332
ret = gnutls_certificate_set_openpgp_key_file
285
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
286
334
if (ret != GNUTLS_E_SUCCESS) {
287
fprintf
288
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
289
" '%s')\n",
290
ret, CERTFILE, KEYFILE);
291
fprintf(stdout, "The Error is: %s\n",
335
fprintf(stderr,
336
"Error[%d] while reading the OpenPGP key pair ('%s',"
337
" '%s')\n", ret, pubkeyfile, seckeyfile);
338
fprintf(stdout, "The GnuTLS error is: %s\n",
292
339
safer_gnutls_strerror(ret));
293
return -1;
294
}
295
296
//GnuTLS server initialization
297
if ((ret = gnutls_dh_params_init (&es->dh_params))
298
!= GNUTLS_E_SUCCESS) {
299
fprintf (stderr, "Error in dh parameter initialization: %s\n",
300
safer_gnutls_strerror(ret));
301
return -1;
302
}
303
304
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in prime generation: %s\n",
307
safer_gnutls_strerror(ret));
308
return -1;
309
}
310
311
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
312
313
// GnuTLS session creation
314
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
315
!= GNUTLS_E_SUCCESS){
340
goto globalfail;
341
}
342
343
/* GnuTLS server initialization */
344
ret = gnutls_dh_params_init(&mc->dh_params);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
347
" %s\n", safer_gnutls_strerror(ret));
348
goto globalfail;
349
}
350
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
351
if (ret != GNUTLS_E_SUCCESS) {
352
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
353
safer_gnutls_strerror(ret));
354
goto globalfail;
355
}
356
357
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
358
359
return 0;
360
361
globalfail:
362
363
gnutls_certificate_free_credentials (mc->cred);
364
gnutls_global_deinit ();
365
return -1;
366
367
}
368
369
static int init_gnutls_session(mandos_context *mc,
370
gnutls_session_t *session){
371
int ret;
372
/* GnuTLS session creation */
373
ret = gnutls_init(session, GNUTLS_SERVER);
374
if (ret != GNUTLS_E_SUCCESS){
316
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
317
376
safer_gnutls_strerror(ret));
318
377
}
319
378
320
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
321
!= GNUTLS_E_SUCCESS) {
322
fprintf(stderr, "Syntax error at: %s\n", err);
323
fprintf(stderr, "GnuTLS error: %s\n",
324
safer_gnutls_strerror(ret));
325
return -1;
379
{
380
const char *err;
381
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Syntax error at: %s\n", err);
384
fprintf(stderr, "GnuTLS error: %s\n",
385
safer_gnutls_strerror(ret));
386
gnutls_deinit (*session);
387
return -1;
388
}
326
389
}
327
390
328
if ((ret = gnutls_credentials_set
329
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
330
!= GNUTLS_E_SUCCESS) {
331
fprintf(stderr, "Error setting a credentials set: %s\n",
391
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
392
mc->cred);
393
if (ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
332
395
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
333
397
return -1;
334
398
}
335
399
336
400
/* ignore client certificate if any. */
337
gnutls_certificate_server_set_request (es->session,
401
gnutls_certificate_server_set_request (*session,
338
402
GNUTLS_CERT_IGNORE);
339
403
340
gnutls_dh_set_prime_bits (es->session, DH_BITS);
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
341
405
342
406
return 0;
343
407
}
344
408
345
void empty_log(__attribute__((unused)) AvahiLogLevel level,
346
__attribute__((unused)) const char *txt){}
409
/* Avahi log function callback */
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
__attribute__((unused)) const char *txt){}
347
412
348
int start_mandos_communication(char *ip, uint16_t port,
349
unsigned int if_index){
413
/* Called when a Mandos server is found */
414
static int start_mandos_communication(const char *ip, uint16_t port,
415
AvahiIfIndex if_index,
416
mandos_context *mc){
350
417
int ret, tcp_sd;
351
struct sockaddr_in6 to;
352
encrypted_session es;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
353
419
char *buffer = NULL;
354
420
char *decrypted_buffer;
355
421
size_t buffer_length = 0;
356
422
size_t buffer_capacity = 0;
357
423
ssize_t decrypted_buffer_size;
424
size_t written;
358
425
int retval = 0;
359
426
char interface[IF_NAMESIZE];
427
gnutls_session_t session;
428
429
ret = init_gnutls_session (mc, &session);
430
if (ret != 0){
431
return -1;
432
}
360
433
361
434
if(debug){
362
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
436
ip, port);
363
437
}
364
438
365
439
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
367
441
perror("socket");
368
442
return -1;
369
443
}
370
371
if(if_indextoname(if_index, interface) == NULL){
372
if(debug){
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
373
447
perror("if_indextoname");
448
return -1;
374
449
}
375
return -1;
376
}
377
378
if(debug){
379
450
fprintf(stderr, "Binding to interface %s\n", interface);
380
451
}
381
452
382
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
383
if(ret < 0) {
384
perror("setsockopt bindtodevice");
385
return -1;
386
}
387
388
memset(&to,0,sizeof(to));
389
to.sin6_family = AF_INET6;
390
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
453
memset(&to,0,sizeof(to)); /* Spurious warning */
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
391
458
if (ret < 0 ){
392
459
perror("inet_pton");
393
460
return -1;
394
}
461
}
395
462
if(ret == 0){
396
463
fprintf(stderr, "Bad address: %s\n", ip);
397
464
return -1;
398
465
}
399
/* Spurious warnings for the next line, see for instance
400
<http://bugs.debian.org/488884> */
401
to.sin6_port = htons(port);
466
to.in6.sin6_port = htons(port); /* Spurious warning */
402
467
403
to.sin6_scope_id = (uint32_t)if_index;
468
to.in6.sin6_scope_id = (uint32_t)if_index;
404
469
405
470
if(debug){
406
fprintf(stderr, "Connection to: %s\n", ip);
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
475
perror("inet_ntop");
476
} else {
477
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
479
}
480
}
407
481
}
408
482
409
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
483
ret = connect(tcp_sd, &to.in, sizeof(to));
410
484
if (ret < 0){
411
485
perror("connect");
412
486
return -1;
413
487
}
414
415
ret = initgnutls (&es);
416
if (ret != 0){
417
retval = -1;
418
return -1;
488
489
const char *out = mandos_protocol_version;
490
written = 0;
491
while (true){
492
size_t out_size = strlen(out);
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
494
out_size - written));
495
if (ret == -1){
496
perror("write");
497
retval = -1;
498
goto mandos_end;
499
}
500
written += (size_t)ret;
501
if(written < out_size){
502
continue;
503
} else {
504
if (out == mandos_protocol_version){
505
written = 0;
506
out = "\r\n";
507
} else {
508
break;
509
}
510
}
419
511
}
420
421
gnutls_transport_set_ptr (es.session,
422
(gnutls_transport_ptr_t) tcp_sd);
423
512
424
513
if(debug){
425
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
426
515
}
427
516
428
ret = gnutls_handshake (es.session);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
429
520
430
521
if (ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
432
gnutls_perror (ret);
522
if(debug){
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
524
gnutls_perror (ret);
525
}
433
526
retval = -1;
434
goto exit;
527
goto mandos_end;
435
528
}
436
529
437
//Retrieve OpenPGP packet that contains the wanted password
530
/* Read OpenPGP packet that contains the wanted password */
438
531
439
532
if(debug){
440
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
442
535
}
443
536
444
537
while(true){
445
if (buffer_length + BUFFER_SIZE > buffer_capacity){
446
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
447
if (buffer == NULL){
448
perror("realloc");
449
goto exit;
450
}
451
buffer_capacity += BUFFER_SIZE;
538
buffer_capacity = adjustbuffer(&buffer, buffer_length,
539
buffer_capacity);
540
if (buffer_capacity == 0){
541
perror("adjustbuffer");
542
retval = -1;
543
goto mandos_end;
452
544
}
453
545
454
ret = gnutls_record_recv
455
(es.session, buffer+buffer_length, BUFFER_SIZE);
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
456
548
if (ret == 0){
457
549
break;
458
550
}
462
554
case GNUTLS_E_AGAIN:
463
555
break;
464
556
case GNUTLS_E_REHANDSHAKE:
465
ret = gnutls_handshake (es.session);
557
ret = gnutls_handshake (session);
466
558
if (ret < 0){
467
fprintf(stderr, "\n*** Handshake failed ***\n");
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
468
560
gnutls_perror (ret);
469
561
retval = -1;
470
goto exit;
562
goto mandos_end;
471
563
}
472
564
break;
473
565
default:
474
566
fprintf(stderr, "Unknown error while reading data from"
475
" encrypted session with mandos server\n");
567
" encrypted session with Mandos server\n");
476
568
retval = -1;
477
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
478
goto exit;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
479
571
}
480
572
} else {
481
573
buffer_length += (size_t) ret;
482
574
}
483
575
}
484
576
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
485
583
if (buffer_length > 0){
486
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
487
585
buffer_length,
488
586
&decrypted_buffer,
489
CERT_ROOT);
587
keydir);
490
588
if (decrypted_buffer_size >= 0){
491
while(decrypted_buffer_size > 0){
492
ret = fwrite (decrypted_buffer, 1, (size_t)decrypted_buffer_size,
493
stdout);
589
written = 0;
590
while(written < (size_t) decrypted_buffer_size){
591
ret = (int)fwrite (decrypted_buffer + written, 1,
592
(size_t)decrypted_buffer_size - written,
593
stdout);
494
594
if(ret == 0 and ferror(stdout)){
495
595
if(debug){
496
596
fprintf(stderr, "Error writing encrypted data: %s\n",
499
599
retval = -1;
500
600
break;
501
601
}
502
decrypted_buffer += ret;
503
decrypted_buffer_size -= ret;
602
written += (size_t)ret;
504
603
}
505
604
free(decrypted_buffer);
506
605
} else {
507
606
retval = -1;
508
607
}
509
608
}
510
511
//shutdown procedure
512
513
if(debug){
514
fprintf(stderr, "Closing TLS session\n");
515
}
516
609
610
/* Shutdown procedure */
611
612
mandos_end:
517
613
free(buffer);
518
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
519
exit:
520
614
close(tcp_sd);
521
gnutls_deinit (es.session);
522
gnutls_certificate_free_credentials (es.cred);
523
gnutls_global_deinit ();
615
gnutls_deinit (session);
524
616
return retval;
525
617
}
526
618
527
static AvahiSimplePoll *simple_poll = NULL;
528
static AvahiServer *server = NULL;
529
530
static void resolve_callback(
531
AvahiSServiceResolver *r,
532
AVAHI_GCC_UNUSED AvahiIfIndex interface,
533
AVAHI_GCC_UNUSED AvahiProtocol protocol,
534
AvahiResolverEvent event,
535
const char *name,
536
const char *type,
537
const char *domain,
538
const char *host_name,
539
const AvahiAddress *address,
540
uint16_t port,
541
AVAHI_GCC_UNUSED AvahiStringList *txt,
542
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
543
AVAHI_GCC_UNUSED void* userdata) {
544
545
assert(r);
546
619
static void resolve_callback(AvahiSServiceResolver *r,
620
AvahiIfIndex interface,
621
AVAHI_GCC_UNUSED AvahiProtocol protocol,
622
AvahiResolverEvent event,
623
const char *name,
624
const char *type,
625
const char *domain,
626
const char *host_name,
627
const AvahiAddress *address,
628
uint16_t port,
629
AVAHI_GCC_UNUSED AvahiStringList *txt,
630
AVAHI_GCC_UNUSED AvahiLookupResultFlags
631
flags,
632
void* userdata) {
633
mandos_context *mc = userdata;
634
assert(r); /* Spurious warning */
635
547
636
/* Called whenever a service has been resolved successfully or
548
637
timed out */
549
638
550
639
switch (event) {
551
640
default:
552
641
case AVAHI_RESOLVER_FAILURE:
553
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
554
" type '%s' in domain '%s': %s\n", name, type, domain,
555
avahi_strerror(avahi_server_errno(server)));
642
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
643
" of type '%s' in domain '%s': %s\n", name, type, domain,
644
avahi_strerror(avahi_server_errno(mc->server)));
556
645
break;
557
646
558
647
case AVAHI_RESOLVER_FOUND:
559
648
{
560
649
char ip[AVAHI_ADDRESS_STR_MAX];
561
650
avahi_address_snprint(ip, sizeof(ip), address);
562
651
if(debug){
563
fprintf(stderr, "Mandos server found on %s (%s) on port %d\n",
564
host_name, ip, port);
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
565
654
}
566
int ret = start_mandos_communication(ip, port,
567
(unsigned int)
568
interface);
655
int ret = start_mandos_communication(ip, port, interface, mc);
569
656
if (ret == 0){
570
657
exit(EXIT_SUCCESS);
571
} else {
572
exit(EXIT_FAILURE);
573
658
}
574
659
}
575
660
}
576
661
avahi_s_service_resolver_free(r);
577
662
}
578
663
579
static void browse_callback(
580
AvahiSServiceBrowser *b,
581
AvahiIfIndex interface,
582
AvahiProtocol protocol,
583
AvahiBrowserEvent event,
584
const char *name,
585
const char *type,
586
const char *domain,
587
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
588
void* userdata) {
589
590
AvahiServer *s = userdata;
591
assert(b);
592
593
/* Called whenever a new services becomes available on the LAN or
594
is removed from the LAN */
595
596
switch (event) {
597
default:
598
case AVAHI_BROWSER_FAILURE:
599
600
fprintf(stderr, "(Browser) %s\n",
601
avahi_strerror(avahi_server_errno(server)));
602
avahi_simple_poll_quit(simple_poll);
603
return;
604
605
case AVAHI_BROWSER_NEW:
606
/* We ignore the returned resolver object. In the callback
607
function we free it. If the server is terminated before
608
the callback function is called the server will free
609
the resolver for us. */
610
611
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
612
type, domain,
613
AVAHI_PROTO_INET6, 0,
614
resolve_callback, s)))
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(s)));
617
break;
618
619
case AVAHI_BROWSER_REMOVE:
620
break;
621
622
case AVAHI_BROWSER_ALL_FOR_NOW:
623
case AVAHI_BROWSER_CACHE_EXHAUSTED:
624
break;
664
static void browse_callback( AvahiSServiceBrowser *b,
665
AvahiIfIndex interface,
666
AvahiProtocol protocol,
667
AvahiBrowserEvent event,
668
const char *name,
669
const char *type,
670
const char *domain,
671
AVAHI_GCC_UNUSED AvahiLookupResultFlags
672
flags,
673
void* userdata) {
674
mandos_context *mc = userdata;
675
assert(b); /* Spurious warning */
676
677
/* Called whenever a new services becomes available on the LAN or
678
is removed from the LAN */
679
680
switch (event) {
681
default:
682
case AVAHI_BROWSER_FAILURE:
683
684
fprintf(stderr, "(Avahi browser) %s\n",
685
avahi_strerror(avahi_server_errno(mc->server)));
686
avahi_simple_poll_quit(mc->simple_poll);
687
return;
688
689
case AVAHI_BROWSER_NEW:
690
/* We ignore the returned Avahi resolver object. In the callback
691
function we free it. If the Avahi server is terminated before
692
the callback function is called the Avahi server will free the
693
resolver for us. */
694
695
if (!(avahi_s_service_resolver_new(mc->server, interface,
696
protocol, name, type, domain,
697
AVAHI_PROTO_INET6, 0,
698
resolve_callback, mc)))
699
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
700
name, avahi_strerror(avahi_server_errno(mc->server)));
701
break;
702
703
case AVAHI_BROWSER_REMOVE:
704
break;
705
706
case AVAHI_BROWSER_ALL_FOR_NOW:
707
case AVAHI_BROWSER_CACHE_EXHAUSTED:
708
if(debug){
709
fprintf(stderr, "No Mandos server found, still searching...\n");
625
710
}
626
}
627
628
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
629
AvahiServerConfig config;
711
break;
712
}
713
}
714
715
/* Combines file name and path and returns the malloced new
716
string. some sane checks could/should be added */
717
static const char *combinepath(const char *first, const char *second){
718
size_t f_len = strlen(first);
719
size_t s_len = strlen(second);
720
char *tmp = malloc(f_len + s_len + 2);
721
if (tmp == NULL){
722
return NULL;
723
}
724
if(f_len > 0){
725
memcpy(tmp, first, f_len); /* Spurious warning */
726
}
727
tmp[f_len] = '/';
728
if(s_len > 0){
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
730
}
731
tmp[f_len + 1 + s_len] = '\0';
732
return tmp;
733
}
734
735
736
int main(int argc, char *argv[]){
630
737
AvahiSServiceBrowser *sb = NULL;
631
738
int error;
632
739
int ret;
633
int returncode = EXIT_SUCCESS;
740
int exitcode = EXIT_SUCCESS;
634
741
const char *interface = "eth0";
635
636
while (true){
637
static struct option long_options[] = {
638
{"debug", no_argument, (int *)&debug, 1},
639
{"interface", required_argument, 0, 'i'},
640
{0, 0, 0, 0} };
641
642
int option_index = 0;
643
ret = getopt_long (argc, argv, "i:", long_options,
644
&option_index);
645
646
if (ret == -1){
647
break;
648
}
649
650
switch(ret){
651
case 0:
652
break;
653
case 'i':
654
interface = optarg;
655
break;
656
default:
657
exit(EXIT_FAILURE);
658
}
742
struct ifreq network;
743
int sd;
744
uid_t uid;
745
gid_t gid;
746
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
753
754
{
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
759
.arg = "IP",
760
.doc = "Connect directly to a sepcified mandos server",
761
.group = 1 },
762
{ .name = "interface", .key = 'i',
763
.arg = "INTERFACE",
764
.doc = "Interface that Avahi will conntect through",
765
.group = 1 },
766
{ .name = "keydir", .key = 'd',
767
.arg = "KEYDIR",
768
.doc = "Directory where the openpgp keyring is",
769
.group = 1 },
770
{ .name = "seckey", .key = 's',
771
.arg = "SECKEY",
772
.doc = "Secret openpgp key for gnutls authentication",
773
.group = 1 },
774
{ .name = "pubkey", .key = 'p',
775
.arg = "PUBKEY",
776
.doc = "Public openpgp key for gnutls authentication",
777
.group = 2 },
778
{ .name = "dh-bits", .key = 129,
779
.arg = "BITS",
780
.doc = "dh-bits to use in gnutls communication",
781
.group = 2 },
782
{ .name = "priority", .key = 130,
783
.arg = "PRIORITY",
784
.doc = "GNUTLS priority", .group = 1 },
785
{ .name = NULL }
786
};
787
788
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
793
switch (key) {
794
case 128:
795
debug = true;
796
break;
797
case 'c':
798
connect_to = arg;
799
break;
800
case 'i':
801
interface = arg;
802
break;
803
case 'd':
804
keydir = arg;
805
break;
806
case 's':
807
seckeyfile = arg;
808
break;
809
case 'p':
810
pubkeyfile = arg;
811
break;
812
case 129:
813
errno = 0;
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
815
if (errno){
816
perror("strtol");
817
exit(EXIT_FAILURE);
818
}
819
break;
820
case 130:
821
mc.priority = arg;
822
break;
823
case ARGP_KEY_ARG:
824
argp_usage (state);
825
break;
826
case ARGP_KEY_END:
827
break;
828
default:
829
return ARGP_ERR_UNKNOWN;
830
}
831
return 0;
832
}
833
834
struct argp argp = { .options = options, .parser = parse_opt,
835
.args_doc = "",
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
839
}
840
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
844
exitcode = EXIT_FAILURE;
845
goto end;
846
}
847
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
851
goto end;
852
}
853
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
855
if (ret == -1){
856
fprintf(stderr, "init_gnutls_global\n");
857
goto end;
858
} else {
859
gnutls_initalized = true;
860
}
861
862
uid = getuid();
863
gid = getgid();
864
865
ret = setuid(uid);
866
if (ret == -1){
867
perror("setuid");
868
}
869
870
setgid(gid);
871
if (ret == -1){
872
perror("setgid");
873
}
874
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
876
if(if_index == 0){
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
878
exit(EXIT_FAILURE);
879
}
880
881
if(connect_to != NULL){
882
/* Connect directly, do not use Zeroconf */
883
/* (Mainly meant for debugging) */
884
char *address = strrchr(connect_to, ':');
885
if(address == NULL){
886
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
}
890
errno = 0;
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
892
if(errno){
893
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
895
goto end;
896
}
897
*address = '\0';
898
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
900
if(ret < 0){
901
exitcode = EXIT_FAILURE;
902
} else {
903
exitcode = EXIT_SUCCESS;
904
}
905
goto end;
906
}
907
908
/* If the interface is down, bring it up */
909
{
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
911
if(sd < 0) {
912
perror("socket");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
strcpy(network.ifr_name, interface); /* Spurious warning */
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
918
if(ret == -1){
919
perror("ioctl SIOCGIFFLAGS");
920
exitcode = EXIT_FAILURE;
921
goto end;
922
}
923
if((network.ifr_flags & IFF_UP) == 0){
924
network.ifr_flags |= IFF_UP;
925
ret = ioctl(sd, SIOCSIFFLAGS, &network);
926
if(ret == -1){
927
perror("ioctl SIOCSIFFLAGS");
928
exitcode = EXIT_FAILURE;
929
goto end;
930
}
931
}
932
close(sd);
659
933
}
660
934
661
935
if (not debug){
662
936
avahi_set_log_function(empty_log);
663
937
}
664
938
665
/* Initialize the psuedo-RNG */
939
/* Initialize the pseudo-RNG for Avahi */
666
940
srand((unsigned int) time(NULL));
667
668
/* Allocate main loop object */
669
if (!(simple_poll = avahi_simple_poll_new())) {
670
fprintf(stderr, "Failed to create simple poll object.\n");
671
672
goto exit;
673
}
674
675
/* Do not publish any local records */
676
avahi_server_config_init(&config);
677
config.publish_hinfo = 0;
678
config.publish_addresses = 0;
679
config.publish_workstation = 0;
680
config.publish_domain = 0;
681
682
/* Allocate a new server */
683
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
684
&config, NULL, NULL, &error);
685
686
/* Free the configuration data */
687
avahi_server_config_free(&config);
688
689
/* Check if creating the server object succeeded */
690
if (!server) {
691
fprintf(stderr, "Failed to create server: %s\n",
941
942
/* Allocate main Avahi loop object */
943
mc.simple_poll = avahi_simple_poll_new();
944
if (mc.simple_poll == NULL) {
945
fprintf(stderr, "Avahi: Failed to create simple poll"
946
" object.\n");
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
951
{
952
AvahiServerConfig config;
953
/* Do not publish any local Zeroconf records */
954
avahi_server_config_init(&config);
955
config.publish_hinfo = 0;
956
config.publish_addresses = 0;
957
config.publish_workstation = 0;
958
config.publish_domain = 0;
959
960
/* Allocate a new server */
961
mc.server = avahi_server_new(avahi_simple_poll_get
962
(mc.simple_poll), &config, NULL,
963
NULL, &error);
964
965
/* Free the Avahi configuration data */
966
avahi_server_config_free(&config);
967
}
968
969
/* Check if creating the Avahi server object succeeded */
970
if (mc.server == NULL) {
971
fprintf(stderr, "Failed to create Avahi server: %s\n",
692
972
avahi_strerror(error));
693
returncode = EXIT_FAILURE;
694
goto exit;
973
exitcode = EXIT_FAILURE;
974
goto end;
695
975
}
696
976
697
/* Create the service browser */
698
sb = avahi_s_service_browser_new(server,
699
(AvahiIfIndex)
700
if_nametoindex(interface),
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
701
979
AVAHI_PROTO_INET6,
702
980
"_mandos._tcp", NULL, 0,
703
browse_callback, server);
704
if (!sb) {
981
browse_callback, &mc);
982
if (sb == NULL) {
705
983
fprintf(stderr, "Failed to create service browser: %s\n",
706
avahi_strerror(avahi_server_errno(server)));
707
returncode = EXIT_FAILURE;
708
goto exit;
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
709
987
}
710
988
711
989
/* Run the main loop */
712
990
713
991
if (debug){
714
fprintf(stderr, "Starting avahi loop search\n");
992
fprintf(stderr, "Starting Avahi loop search\n");
715
993
}
716
994
717
avahi_simple_poll_loop(simple_poll);
995
avahi_simple_poll_loop(mc.simple_poll);
718
996
719
exit:
997
end:
720
998
721
999
if (debug){
722
1000
fprintf(stderr, "%s exiting\n", argv[0]);
723
1001
}
724
1002
725
1003
/* Cleanup things */
726
if (sb)
1004
if (sb != NULL)
727
1005
avahi_s_service_browser_free(sb);
728
1006
729
if (server)
730
avahi_server_free(server);
731
732
if (simple_poll)
733
avahi_simple_poll_free(simple_poll);
734
735
return returncode;
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
1009
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
1012
free(pubkeyfile);
1013
free(seckeyfile);
1014
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
1018
}
1019
1020
return exitcode;
736
1021
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0