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- Committer: Teddy Hogeborn
- Date: 2008-08-10 02:01:04 UTC
- mfrom: (24.1.38 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080810020104-s49hp25rfx8gmw2e
* mandos (main): Use program name in --version output.
- files added:
- mandos-client.xml
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- server.conf => mandos.conf
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
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_* */
43
77
#include <avahi-core/core.h>
44
78
#include <avahi-core/lookup.h>
45
79
#include <avahi-core/log.h>
47
81
#include <avahi-common/malloc.h>
48
82
#include <avahi-common/error.h>
49
83
50
//mandos client part
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
63
64
// gpgme
65
#include <errno.h> /* perror() */
66
#include <gpgme.h>
67
68
// getopt long
69
#include <getopt.h>
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_* */
70
97
71
98
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
74
static const char *certdir = "/conf/conf.d/mandos";
75
static const char *certfile = "openpgp-client.txt";
76
static const char *certkey = "openpgp-client-key.txt";
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 = "password-request 1.0";
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
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
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,
89
140
const char *homedir){
90
141
gpgme_data_t dh_crypto, dh_plain;
91
142
gpgme_ctx_t ctx;
92
143
gpgme_error_t rc;
93
144
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
96
147
gpgme_engine_info_t engine_info;
97
148
98
149
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
100
151
}
101
152
102
153
/* Init GPGME */
108
159
return -1;
109
160
}
110
161
111
/* Set GPGME home directory */
162
/* Set GPGME home directory for the OpenPGP engine only */
112
163
rc = gpgme_get_engine_info (&engine_info);
113
164
if (rc != GPG_ERR_NO_ERROR){
114
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
124
175
engine_info = engine_info->next;
125
176
}
126
177
if(engine_info == NULL){
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
128
179
return -1;
129
180
}
130
181
131
/* Create new GPGME data buffer from packet buffer */
132
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);
133
185
if (rc != GPG_ERR_NO_ERROR){
134
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
135
187
gpgme_strsource(rc), gpgme_strerror(rc));
141
193
if (rc != GPG_ERR_NO_ERROR){
142
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
143
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
gpgme_data_release(dh_crypto);
144
197
return -1;
145
198
}
146
199
149
202
if (rc != GPG_ERR_NO_ERROR){
150
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
151
204
gpgme_strsource(rc), gpgme_strerror(rc));
152
return -1;
205
plaintext_length = -1;
206
goto decrypt_end;
153
207
}
154
208
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
209
/* Decrypt data from the cryptotext data buffer to the plaintext
210
data buffer */
157
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
158
212
if (rc != GPG_ERR_NO_ERROR){
159
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
160
214
gpgme_strsource(rc), gpgme_strerror(rc));
161
return -1;
215
plaintext_length = -1;
216
goto decrypt_end;
162
217
}
163
218
164
219
if(debug){
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
166
221
}
167
222
168
223
if (debug){
169
224
gpgme_decrypt_result_t result;
170
225
result = gpgme_op_decrypt_result(ctx);
194
249
}
195
250
}
196
251
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
199
200
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
201
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
254
perror("pgpme_data_seek");
255
plaintext_length = -1;
256
goto decrypt_end;
203
257
}
204
258
205
*new_packet = 0;
259
*plaintext = NULL;
206
260
while(true){
207
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
208
*new_packet = realloc(*new_packet,
209
(unsigned int)new_packet_capacity
210
+ BUFFER_SIZE);
211
if (*new_packet == NULL){
212
perror("realloc");
213
return -1;
214
}
215
new_packet_capacity += BUFFER_SIZE;
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;
216
268
}
217
269
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
271
BUFFER_SIZE);
220
272
/* Print the data, if any */
221
273
if (ret == 0){
274
/* EOF */
222
275
break;
223
276
}
224
277
if(ret < 0){
225
278
perror("gpgme_data_read");
226
return -1;
279
plaintext_length = -1;
280
goto decrypt_end;
227
281
}
228
new_packet_length += ret;
282
plaintext_length += ret;
229
283
}
230
284
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
/* } */
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);
238
297
239
298
/* Delete the GPGME plaintext data buffer */
240
299
gpgme_data_release(dh_plain);
241
return new_packet_length;
300
return plaintext_length;
242
301
}
243
302
244
303
static const char * safer_gnutls_strerror (int value) {
248
307
return ret;
249
308
}
250
309
310
/* GnuTLS log function callback */
251
311
static void debuggnutls(__attribute__((unused)) int level,
252
312
const char* string){
253
fprintf(stderr, "%s", string);
313
fprintf(stderr, "GnuTLS: %s", string);
254
314
}
255
315
256
static int initgnutls(encrypted_session *es){
257
const char *err;
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
258
319
int ret;
259
320
260
321
if(debug){
261
322
fprintf(stderr, "Initializing GnuTLS\n");
262
323
}
263
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
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));
267
329
return -1;
268
330
}
269
331
270
332
if (debug){
333
/* "Use a log level over 10 to enable all debugging options."
334
* - GnuTLS manual
335
*/
271
336
gnutls_global_set_log_level(11);
272
337
gnutls_global_set_log_function(debuggnutls);
273
338
}
274
339
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
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",
279
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
280
346
return -1;
281
347
}
282
348
283
349
if(debug){
284
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
285
" and keyfile %s as GnuTLS credentials\n", certfile,
286
certkey);
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
287
353
}
288
354
289
355
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
291
357
if (ret != GNUTLS_E_SUCCESS) {
292
fprintf
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
" '%s')\n",
295
ret, certfile, certkey);
296
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",
297
362
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
//GnuTLS server initialization
302
if ((ret = gnutls_dh_params_init (&es->dh_params))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in dh parameter initialization: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
310
!= GNUTLS_E_SUCCESS) {
311
fprintf (stderr, "Error in prime generation: %s\n",
312
safer_gnutls_strerror(ret));
313
return -1;
314
}
315
316
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
317
318
// GnuTLS session creation
319
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
320
!= GNUTLS_E_SUCCESS){
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){
321
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
399
safer_gnutls_strerror(ret));
323
400
}
324
401
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;
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
}
331
412
}
332
413
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",
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",
337
418
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
338
420
return -1;
339
421
}
340
422
341
423
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
424
gnutls_certificate_server_set_request (*session,
343
425
GNUTLS_CERT_IGNORE);
344
426
345
gnutls_dh_set_prime_bits (es->session, DH_BITS);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
346
428
347
429
return 0;
348
430
}
349
431
432
/* Avahi log function callback */
350
433
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
434
__attribute__((unused)) const char *txt){}
352
435
436
/* Called when a Mandos server is found */
353
437
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
438
AvahiIfIndex if_index,
439
mandos_context *mc){
355
440
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
358
442
char *buffer = NULL;
359
443
char *decrypted_buffer;
360
444
size_t buffer_length = 0;
361
445
size_t buffer_capacity = 0;
362
446
ssize_t decrypted_buffer_size;
363
size_t written = 0;
447
size_t written;
364
448
int retval = 0;
365
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
}
366
456
367
457
if(debug){
368
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
377
467
378
468
if(debug){
379
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
380
if(debug){
381
perror("if_indextoname");
382
}
470
perror("if_indextoname");
383
471
return -1;
384
472
}
385
386
473
fprintf(stderr, "Binding to interface %s\n", interface);
387
474
}
388
475
389
476
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
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);
392
481
if (ret < 0 ){
393
482
perror("inet_pton");
394
483
return -1;
395
}
484
}
396
485
if(ret == 0){
397
486
fprintf(stderr, "Bad address: %s\n", ip);
398
487
return -1;
399
488
}
400
to.sin6_port = htons(port); /* Spurious warning */
489
to.in6.sin6_port = htons(port); /* Spurious warning */
401
490
402
to.sin6_scope_id = (uint32_t)if_index;
491
to.in6.sin6_scope_id = (uint32_t)if_index;
403
492
404
493
if(debug){
405
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
406
/* char addrstr[INET6_ADDRSTRLEN]; */
407
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
408
/* sizeof(addrstr)) == NULL){ */
409
/* perror("inet_ntop"); */
410
/* } else { */
411
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
412
/* addrstr, ntohs(to.sin6_port)); */
413
/* } */
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
}
414
504
}
415
505
416
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
506
ret = connect(tcp_sd, &to.in, sizeof(to));
417
507
if (ret < 0){
418
508
perror("connect");
419
509
return -1;
420
510
}
421
422
ret = initgnutls (&es);
423
if (ret != 0){
424
retval = -1;
425
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
}
426
534
}
427
428
gnutls_transport_set_ptr (es.session,
429
(gnutls_transport_ptr_t) tcp_sd);
430
535
431
536
if(debug){
432
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
433
538
}
434
539
435
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);
436
545
437
546
if (ret != GNUTLS_E_SUCCESS){
438
547
if(debug){
439
fprintf(stderr, "\n*** Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
440
549
gnutls_perror (ret);
441
550
}
442
551
retval = -1;
443
goto exit;
552
goto mandos_end;
444
553
}
445
554
446
//Retrieve OpenPGP packet that contains the wanted password
555
/* Read OpenPGP packet that contains the wanted password */
447
556
448
557
if(debug){
449
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
451
560
}
452
561
453
562
while(true){
454
if (buffer_length + BUFFER_SIZE > buffer_capacity){
455
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
456
if (buffer == NULL){
457
perror("realloc");
458
goto exit;
459
}
460
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;
461
569
}
462
570
463
ret = gnutls_record_recv
464
(es.session, buffer+buffer_length, BUFFER_SIZE);
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
465
573
if (ret == 0){
466
574
break;
467
575
}
471
579
case GNUTLS_E_AGAIN:
472
580
break;
473
581
case GNUTLS_E_REHANDSHAKE:
474
ret = gnutls_handshake (es.session);
582
do{
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
475
585
if (ret < 0){
476
fprintf(stderr, "\n*** Handshake failed ***\n");
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
477
587
gnutls_perror (ret);
478
588
retval = -1;
479
goto exit;
589
goto mandos_end;
480
590
}
481
591
break;
482
592
default:
483
593
fprintf(stderr, "Unknown error while reading data from"
484
" encrypted session with mandos server\n");
594
" encrypted session with Mandos server\n");
485
595
retval = -1;
486
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
487
goto exit;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
597
goto mandos_end;
488
598
}
489
599
} else {
490
600
buffer_length += (size_t) ret;
491
601
}
492
602
}
493
603
604
if(debug){
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
494
610
if (buffer_length > 0){
495
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
496
612
buffer_length,
497
613
&decrypted_buffer,
498
certdir);
614
keydir);
499
615
if (decrypted_buffer_size >= 0){
616
written = 0;
500
617
while(written < (size_t) decrypted_buffer_size){
501
618
ret = (int)fwrite (decrypted_buffer + written, 1,
502
619
(size_t)decrypted_buffer_size - written,
516
633
retval = -1;
517
634
}
518
635
}
519
520
//shutdown procedure
521
522
if(debug){
523
fprintf(stderr, "Closing TLS session\n");
524
}
525
636
637
/* Shutdown procedure */
638
639
mandos_end:
526
640
free(buffer);
527
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
528
exit:
529
641
close(tcp_sd);
530
gnutls_deinit (es.session);
531
gnutls_certificate_free_credentials (es.cred);
532
gnutls_global_deinit ();
642
gnutls_deinit (session);
533
643
return retval;
534
644
}
535
645
536
static AvahiSimplePoll *simple_poll = NULL;
537
static AvahiServer *server = NULL;
538
539
static void resolve_callback(
540
AvahiSServiceResolver *r,
541
AvahiIfIndex interface,
542
AVAHI_GCC_UNUSED AvahiProtocol protocol,
543
AvahiResolverEvent event,
544
const char *name,
545
const char *type,
546
const char *domain,
547
const char *host_name,
548
const AvahiAddress *address,
549
uint16_t port,
550
AVAHI_GCC_UNUSED AvahiStringList *txt,
551
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
552
AVAHI_GCC_UNUSED void* userdata) {
553
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;
554
661
assert(r); /* Spurious warning */
555
662
556
663
/* Called whenever a service has been resolved successfully or
559
666
switch (event) {
560
667
default:
561
668
case AVAHI_RESOLVER_FAILURE:
562
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
563
" type '%s' in domain '%s': %s\n", name, type, domain,
564
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)));
565
672
break;
566
673
567
674
case AVAHI_RESOLVER_FOUND:
569
676
char ip[AVAHI_ADDRESS_STR_MAX];
570
677
avahi_address_snprint(ip, sizeof(ip), address);
571
678
if(debug){
572
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
573
" 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);
574
681
}
575
int ret = start_mandos_communication(ip, port, interface);
682
int ret = start_mandos_communication(ip, port, interface, mc);
576
683
if (ret == 0){
577
684
exit(EXIT_SUCCESS);
578
685
}
581
688
avahi_s_service_resolver_free(r);
582
689
}
583
690
584
static void browse_callback(
585
AvahiSServiceBrowser *b,
586
AvahiIfIndex interface,
587
AvahiProtocol protocol,
588
AvahiBrowserEvent event,
589
const char *name,
590
const char *type,
591
const char *domain,
592
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
593
void* userdata) {
594
595
AvahiServer *s = userdata;
596
assert(b); /* Spurious warning */
597
598
/* Called whenever a new services becomes available on the LAN or
599
is removed from the LAN */
600
601
switch (event) {
602
default:
603
case AVAHI_BROWSER_FAILURE:
604
605
fprintf(stderr, "(Browser) %s\n",
606
avahi_strerror(avahi_server_errno(server)));
607
avahi_simple_poll_quit(simple_poll);
608
return;
609
610
case AVAHI_BROWSER_NEW:
611
/* We ignore the returned resolver object. In the callback
612
function we free it. If the server is terminated before
613
the callback function is called the server will free
614
the resolver for us. */
615
616
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
617
type, domain,
618
AVAHI_PROTO_INET6, 0,
619
resolve_callback, s)))
620
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
621
avahi_strerror(avahi_server_errno(s)));
622
break;
623
624
case AVAHI_BROWSER_REMOVE:
625
break;
626
627
case AVAHI_BROWSER_ALL_FOR_NOW:
628
case AVAHI_BROWSER_CACHE_EXHAUSTED:
629
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");
630
737
}
738
break;
739
}
631
740
}
632
741
633
742
/* Combines file name and path and returns the malloced new
640
749
return NULL;
641
750
}
642
751
if(f_len > 0){
643
memcpy(tmp, first, f_len);
752
memcpy(tmp, first, f_len); /* Spurious warning */
644
753
}
645
754
tmp[f_len] = '/';
646
755
if(s_len > 0){
647
memcpy(tmp + f_len + 1, second, s_len);
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
648
757
}
649
758
tmp[f_len + 1 + s_len] = '\0';
650
759
return tmp;
651
760
}
652
761
653
762
654
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
655
AvahiServerConfig config;
763
int main(int argc, char *argv[]){
656
764
AvahiSServiceBrowser *sb = NULL;
657
765
int error;
658
766
int ret;
659
int returncode = EXIT_SUCCESS;
767
int exitcode = EXIT_SUCCESS;
660
768
const char *interface = "eth0";
661
769
struct ifreq network;
662
770
int sd;
771
uid_t uid;
772
gid_t gid;
663
773
char *connect_to = NULL;
664
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
665
666
while (true){
667
static struct option long_options[] = {
668
{"debug", no_argument, (int *)&debug, 1},
669
{"connect", required_argument, 0, 'C'},
670
{"interface", required_argument, 0, 'i'},
671
{"certdir", required_argument, 0, 'd'},
672
{"certkey", required_argument, 0, 'c'},
673
{"certfile", required_argument, 0, 'k'},
674
{0, 0, 0, 0} };
675
676
int option_index = 0;
677
ret = getopt_long (argc, argv, "i:", long_options,
678
&option_index);
679
680
if (ret == -1){
681
break;
682
}
683
684
switch(ret){
685
case 0:
686
break;
687
case 'i':
688
interface = optarg;
689
break;
690
case 'C':
691
connect_to = optarg;
692
break;
693
case 'd':
694
certdir = optarg;
695
break;
696
case 'c':
697
certfile = optarg;
698
break;
699
case 'k':
700
certkey = optarg;
701
break;
702
default:
703
exit(EXIT_FAILURE);
704
}
705
}
706
707
certfile = combinepath(certdir, certfile);
708
if (certfile == NULL){
709
perror("combinepath");
710
returncode = EXIT_FAILURE;
711
goto exit;
712
}
713
714
certkey = combinepath(certdir, certkey);
715
if (certkey == NULL){
716
perror("combinepath");
717
returncode = EXIT_FAILURE;
718
goto exit;
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");
719
905
}
720
906
721
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
730
916
char *address = strrchr(connect_to, ':');
731
917
if(address == NULL){
732
918
fprintf(stderr, "No colon in address\n");
733
exit(EXIT_FAILURE);
919
exitcode = EXIT_FAILURE;
920
goto end;
734
921
}
735
922
errno = 0;
736
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
737
924
if(errno){
738
925
perror("Bad port number");
739
exit(EXIT_FAILURE);
926
exitcode = EXIT_FAILURE;
927
goto end;
740
928
}
741
929
*address = '\0';
742
930
address = connect_to;
743
ret = start_mandos_communication(address, port, if_index);
931
ret = start_mandos_communication(address, port, if_index, &mc);
744
932
if(ret < 0){
745
exit(EXIT_FAILURE);
933
exitcode = EXIT_FAILURE;
746
934
} else {
747
exit(EXIT_SUCCESS);
935
exitcode = EXIT_SUCCESS;
748
936
}
937
goto end;
749
938
}
750
939
751
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
752
if(sd < 0) {
753
perror("socket");
754
returncode = EXIT_FAILURE;
755
goto exit;
756
}
757
strcpy(network.ifr_name, interface);
758
ret = ioctl(sd, SIOCGIFFLAGS, &network);
759
if(ret == -1){
760
761
perror("ioctl SIOCGIFFLAGS");
762
returncode = EXIT_FAILURE;
763
goto exit;
764
}
765
if((network.ifr_flags & IFF_UP) == 0){
766
network.ifr_flags |= IFF_UP;
767
ret = ioctl(sd, SIOCSIFFLAGS, &network);
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);
768
950
if(ret == -1){
769
perror("ioctl SIOCSIFFLAGS");
770
returncode = EXIT_FAILURE;
771
goto exit;
772
}
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);
773
965
}
774
close(sd);
775
966
776
967
if (not debug){
777
968
avahi_set_log_function(empty_log);
778
969
}
779
970
780
/* Initialize the psuedo-RNG */
971
/* Initialize the pseudo-RNG for Avahi */
781
972
srand((unsigned int) time(NULL));
782
783
/* Allocate main loop object */
784
if (!(simple_poll = avahi_simple_poll_new())) {
785
fprintf(stderr, "Failed to create simple poll object.\n");
786
returncode = EXIT_FAILURE;
787
goto exit;
788
}
789
790
/* Do not publish any local records */
791
avahi_server_config_init(&config);
792
config.publish_hinfo = 0;
793
config.publish_addresses = 0;
794
config.publish_workstation = 0;
795
config.publish_domain = 0;
796
797
/* Allocate a new server */
798
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
799
&config, NULL, NULL, &error);
800
801
/* Free the configuration data */
802
avahi_server_config_free(&config);
803
804
/* Check if creating the server object succeeded */
805
if (!server) {
806
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",
807
1004
avahi_strerror(error));
808
returncode = EXIT_FAILURE;
809
goto exit;
1005
exitcode = EXIT_FAILURE;
1006
goto end;
810
1007
}
811
1008
812
/* Create the service browser */
813
sb = avahi_s_service_browser_new(server, if_index,
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
814
1011
AVAHI_PROTO_INET6,
815
1012
"_mandos._tcp", NULL, 0,
816
browse_callback, server);
817
if (!sb) {
1013
browse_callback, &mc);
1014
if (sb == NULL) {
818
1015
fprintf(stderr, "Failed to create service browser: %s\n",
819
avahi_strerror(avahi_server_errno(server)));
820
returncode = EXIT_FAILURE;
821
goto exit;
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
822
1019
}
823
1020
824
1021
/* Run the main loop */
825
1022
826
1023
if (debug){
827
fprintf(stderr, "Starting avahi loop search\n");
1024
fprintf(stderr, "Starting Avahi loop search\n");
828
1025
}
829
1026
830
avahi_simple_poll_loop(simple_poll);
1027
avahi_simple_poll_loop(mc.simple_poll);
831
1028
832
exit:
1029
end:
833
1030
834
1031
if (debug){
835
1032
fprintf(stderr, "%s exiting\n", argv[0]);
836
1033
}
837
1034
838
1035
/* Cleanup things */
839
if (sb)
1036
if (sb != NULL)
840
1037
avahi_s_service_browser_free(sb);
841
1038
842
if (server)
843
avahi_server_free(server);
844
845
if (simple_poll)
846
avahi_simple_poll_free(simple_poll);
847
free(certfile);
848
free(certkey);
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
}
849
1051
850
return returncode;
1052
return exitcode;
851
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0