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- Committer: Teddy Hogeborn
- Date: 2008-09-03 05:04:40 UTC
- Revision ID: teddy@fukt.bsnet.se-20080903050440-7cwzxestx6pvdy1i
* Makefile (mandos.8): Add dependency on "overview.xml" and
"legalnotice.xml".
(mandos-keygen.8): New target.
(mandos-conf.5): Added dependency on "legalnotice.xml".
(plugin-runner.8mandos): New target
(plugins.d/password-request.8mandos): - '' -
* mandos-options.xml (priority): Make wording server/client neutral.
* plugins.d/password-request.c (main): Changed .arg fields of the argp
options struct to be more
consistent with the manual.
* plugins.d/password-request.xml (OVERVIEW): Moved to after "OPTIONS".
(OPTIONS): Improved wording and names of replaceables.
"legalnotice.xml".
(mandos-keygen.8): New target.
(mandos-conf.5): Added dependency on "legalnotice.xml".
(plugin-runner.8mandos): New target
(plugins.d/password-request.8mandos): - '' -
* mandos-options.xml (priority): Make wording server/client neutral.
* plugins.d/password-request.c (main): Changed .arg fields of the argp
options struct to be more
consistent with the manual.
* plugins.d/password-request.xml (OVERVIEW): Moved to after "OPTIONS".
(OPTIONS): Improved wording and names of replaceables.
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.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
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,
41
SIOCSIFFLAGS */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, 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(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
42
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
59
SIOCSIFFLAGS, if_indextoname(),
60
if_nametoindex(), IF_NAMESIZE */
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
67
#include <argp.h> /* struct argp_option, error_t, struct
68
argp_state, struct argp,
69
argp_parse(), ARGP_KEY_ARG,
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
44
71
72
/* Avahi */
73
/* All Avahi types, constants and functions
74
Avahi*, avahi_*,
75
AVAHI_* */
45
76
#include <avahi-core/core.h>
46
77
#include <avahi-core/lookup.h>
47
78
#include <avahi-core/log.h>
49
80
#include <avahi-common/malloc.h>
50
81
#include <avahi-common/error.h>
51
82
52
//mandos client part
53
#include <sys/types.h> /* socket(), inet_pton() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
58
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
65
66
// gpgme
67
#include <errno.h> /* perror() */
68
#include <gpgme.h>
69
70
// getopt_long
71
#include <getopt.h>
83
/* GnuTLS */
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
85
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
94
functions:
95
gpgme_*
96
GPGME_PROTOCOL_OpenPGP,
97
GPG_ERR_NO_* */
72
98
73
99
#define BUFFER_SIZE 256
74
100
101
bool debug = false;
75
102
static const char *keydir = "/conf/conf.d/mandos";
76
static const char *pubkeyfile = "pubkey.txt";
77
static const char *seckeyfile = "seckey.txt";
78
79
bool debug = false;
80
81
/* Used for passing in values through all the callback functions */
103
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
107
/* Used for passing in values through the Avahi callback functions */
82
108
typedef struct {
83
109
AvahiSimplePoll *simple_poll;
84
110
AvahiServer *server;
85
111
gnutls_certificate_credentials_t cred;
86
112
unsigned int dh_bits;
113
gnutls_dh_params_t dh_params;
87
114
const char *priority;
88
115
} mandos_context;
89
116
117
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
120
* "buffer_length" is how much is already used.
121
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
127
return 0;
128
}
129
buffer_capacity += BUFFER_SIZE;
130
}
131
return buffer_capacity;
132
}
133
90
134
/*
91
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
92
136
* Returns -1 on error
99
143
gpgme_ctx_t ctx;
100
144
gpgme_error_t rc;
101
145
ssize_t ret;
102
ssize_t plaintext_capacity = 0;
146
size_t plaintext_capacity = 0;
103
147
ssize_t plaintext_length = 0;
104
148
gpgme_engine_info_t engine_info;
105
149
170
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
171
215
gpgme_strsource(rc), gpgme_strerror(rc));
172
216
plaintext_length = -1;
217
if (debug){
218
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
222
} else {
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
227
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
229
}
230
gpgme_recipient_t recipient;
231
recipient = result->recipients;
232
if(recipient){
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
239
? "No" : "Yes");
240
recipient = recipient->next;
241
}
242
}
243
}
244
}
173
245
goto decrypt_end;
174
246
}
175
247
177
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
178
250
}
179
251
180
if (debug){
181
gpgme_decrypt_result_t result;
182
result = gpgme_op_decrypt_result(ctx);
183
if (result == NULL){
184
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
185
} else {
186
fprintf(stderr, "Unsupported algorithm: %s\n",
187
result->unsupported_algorithm);
188
fprintf(stderr, "Wrong key usage: %d\n",
189
result->wrong_key_usage);
190
if(result->file_name != NULL){
191
fprintf(stderr, "File name: %s\n", result->file_name);
192
}
193
gpgme_recipient_t recipient;
194
recipient = result->recipients;
195
if(recipient){
196
while(recipient != NULL){
197
fprintf(stderr, "Public key algorithm: %s\n",
198
gpgme_pubkey_algo_name(recipient->pubkey_algo));
199
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
200
fprintf(stderr, "Secret key available: %s\n",
201
recipient->status == GPG_ERR_NO_SECKEY
202
? "No" : "Yes");
203
recipient = recipient->next;
204
}
205
}
206
}
207
}
208
209
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
210
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
211
254
perror("pgpme_data_seek");
215
258
216
259
*plaintext = NULL;
217
260
while(true){
218
if (plaintext_length + BUFFER_SIZE > plaintext_capacity){
219
*plaintext = realloc(*plaintext,
220
(unsigned int)plaintext_capacity
221
+ BUFFER_SIZE);
222
if (*plaintext == NULL){
223
perror("realloc");
261
plaintext_capacity = adjustbuffer(plaintext,
262
(size_t)plaintext_length,
263
plaintext_capacity);
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
224
266
plaintext_length = -1;
225
267
goto decrypt_end;
226
}
227
plaintext_capacity += BUFFER_SIZE;
228
268
}
229
269
230
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
241
281
}
242
282
plaintext_length += ret;
243
283
}
244
284
245
285
if(debug){
246
286
fprintf(stderr, "Decrypted password is: ");
247
for(size_t i = 0; i < plaintext_length; i++){
287
for(ssize_t i = 0; i < plaintext_length; i++){
248
288
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
249
289
}
250
290
fprintf(stderr, "\n");
261
301
}
262
302
263
303
static const char * safer_gnutls_strerror (int value) {
264
const char *ret = gnutls_strerror (value);
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
265
305
if (ret == NULL)
266
306
ret = "(unknown)";
267
307
return ret;
268
308
}
269
309
310
/* GnuTLS log function callback */
270
311
static void debuggnutls(__attribute__((unused)) int level,
271
312
const char* string){
272
fprintf(stderr, "%s", string);
313
fprintf(stderr, "GnuTLS: %s", string);
273
314
}
274
315
275
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
276
gnutls_dh_params_t *dh_params){
277
const char *err;
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
318
const char *seckeyfilename){
278
319
int ret;
279
320
280
321
if(debug){
281
322
fprintf(stderr, "Initializing GnuTLS\n");
282
323
}
283
284
if ((ret = gnutls_global_init ())
285
!= GNUTLS_E_SUCCESS) {
286
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));
287
329
return -1;
288
330
}
289
331
290
332
if (debug){
333
/* "Use a log level over 10 to enable all debugging options."
334
* - GnuTLS manual
335
*/
291
336
gnutls_global_set_log_level(11);
292
337
gnutls_global_set_log_function(debuggnutls);
293
338
}
294
339
295
/* openpgp credentials */
296
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
297
!= GNUTLS_E_SUCCESS) {
298
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", /* Spurious
344
warning */
299
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
300
347
return -1;
301
348
}
302
349
303
350
if(debug){
304
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
305
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
306
seckeyfile);
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
307
354
}
308
355
309
356
ret = gnutls_certificate_set_openpgp_key_file
310
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
(mc->cred, pubkeyfilename, seckeyfilename,
358
GNUTLS_OPENPGP_FMT_BASE64);
311
359
if (ret != GNUTLS_E_SUCCESS) {
312
fprintf
313
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
314
" '%s')\n",
315
ret, pubkeyfile, seckeyfile);
316
fprintf(stdout, "The Error is: %s\n",
360
fprintf(stderr,
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
317
364
safer_gnutls_strerror(ret));
318
return -1;
319
}
320
321
//GnuTLS server initialization
322
if ((ret = gnutls_dh_params_init(dh_params))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf (stderr, "Error in dh parameter initialization: %s\n",
325
safer_gnutls_strerror(ret));
326
return -1;
327
}
328
329
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
330
!= GNUTLS_E_SUCCESS) {
331
fprintf (stderr, "Error in prime generation: %s\n",
332
safer_gnutls_strerror(ret));
333
return -1;
334
}
335
336
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
337
338
// GnuTLS session creation
339
if ((ret = gnutls_init(session, GNUTLS_SERVER))
340
!= GNUTLS_E_SUCCESS){
365
goto globalfail;
366
}
367
368
/* GnuTLS server initialization */
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
384
return 0;
385
386
globalfail:
387
388
gnutls_certificate_free_credentials(mc->cred);
389
gnutls_global_deinit();
390
return -1;
391
}
392
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
395
int ret;
396
/* GnuTLS session creation */
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
341
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
342
400
safer_gnutls_strerror(ret));
343
401
}
344
402
345
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
346
!= GNUTLS_E_SUCCESS) {
347
fprintf(stderr, "Syntax error at: %s\n", err);
348
fprintf(stderr, "GnuTLS error: %s\n",
349
safer_gnutls_strerror(ret));
350
return -1;
403
{
404
const char *err;
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
407
fprintf(stderr, "Syntax error at: %s\n", err);
408
fprintf(stderr, "GnuTLS error: %s\n",
409
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
411
return -1;
412
}
351
413
}
352
414
353
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
354
mc->cred))
355
!= GNUTLS_E_SUCCESS) {
356
fprintf(stderr, "Error setting a credentials set: %s\n",
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
357
419
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
358
421
return -1;
359
422
}
360
423
367
430
return 0;
368
431
}
369
432
433
/* Avahi log function callback */
370
434
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
371
435
__attribute__((unused)) const char *txt){}
372
436
437
/* Called when a Mandos server is found */
373
438
static int start_mandos_communication(const char *ip, uint16_t port,
374
439
AvahiIfIndex if_index,
375
440
mandos_context *mc){
376
441
int ret, tcp_sd;
377
struct sockaddr_in6 to;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
378
443
char *buffer = NULL;
379
444
char *decrypted_buffer;
380
445
size_t buffer_length = 0;
381
446
size_t buffer_capacity = 0;
382
447
ssize_t decrypted_buffer_size;
383
size_t written = 0;
448
size_t written;
384
449
int retval = 0;
385
450
char interface[IF_NAMESIZE];
386
451
gnutls_session_t session;
387
gnutls_dh_params_t dh_params;
452
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
455
return -1;
456
}
388
457
389
458
if(debug){
390
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
391
ip, port);
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
460
"\n", ip, port);
392
461
}
393
462
394
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
396
465
perror("socket");
397
466
return -1;
398
467
}
399
468
400
469
if(debug){
401
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
402
471
perror("if_indextoname");
405
474
fprintf(stderr, "Binding to interface %s\n", interface);
406
475
}
407
476
408
memset(&to,0,sizeof(to)); /* Spurious warning */
409
to.sin6_family = AF_INET6;
410
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
477
memset(&to, 0, sizeof(to));
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
411
482
if (ret < 0 ){
412
483
perror("inet_pton");
413
484
return -1;
416
487
fprintf(stderr, "Bad address: %s\n", ip);
417
488
return -1;
418
489
}
419
to.sin6_port = htons(port); /* Spurious warning */
490
to.in6.sin6_port = htons(port); /* Spurious warning */
420
491
421
to.sin6_scope_id = (uint32_t)if_index;
492
to.in6.sin6_scope_id = (uint32_t)if_index;
422
493
423
494
if(debug){
424
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
496
port);
425
497
char addrstr[INET6_ADDRSTRLEN] = "";
426
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
427
499
sizeof(addrstr)) == NULL){
428
500
perror("inet_ntop");
429
501
} else {
433
505
}
434
506
}
435
507
436
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
508
ret = connect(tcp_sd, &to.in, sizeof(to));
437
509
if (ret < 0){
438
510
perror("connect");
439
511
return -1;
440
512
}
441
513
442
ret = initgnutls (mc, &session, &dh_params);
443
if (ret != 0){
444
retval = -1;
445
return -1;
514
const char *out = mandos_protocol_version;
515
written = 0;
516
while (true){
517
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
520
if (ret == -1){
521
perror("write");
522
retval = -1;
523
goto mandos_end;
524
}
525
written += (size_t)ret;
526
if(written < out_size){
527
continue;
528
} else {
529
if (out == mandos_protocol_version){
530
written = 0;
531
out = "\r\n";
532
} else {
533
break;
534
}
535
}
536
}
537
538
if(debug){
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
446
540
}
447
541
448
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
449
543
450
if(debug){
451
fprintf(stderr, "Establishing TLS session with %s\n", ip);
452
}
453
454
ret = gnutls_handshake (session);
544
do{
545
ret = gnutls_handshake (session);
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
455
547
456
548
if (ret != GNUTLS_E_SUCCESS){
457
549
if(debug){
458
fprintf(stderr, "\n*** Handshake failed ***\n");
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
459
551
gnutls_perror (ret);
460
552
}
461
553
retval = -1;
462
goto exit;
554
goto mandos_end;
463
555
}
464
556
465
//Retrieve OpenPGP packet that contains the wanted password
557
/* Read OpenPGP packet that contains the wanted password */
466
558
467
559
if(debug){
468
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
469
561
ip);
470
562
}
471
563
472
564
while(true){
473
if (buffer_length + BUFFER_SIZE > buffer_capacity){
474
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
475
if (buffer == NULL){
476
perror("realloc");
477
goto exit;
478
}
479
buffer_capacity += BUFFER_SIZE;
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
566
buffer_capacity);
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
569
retval = -1;
570
goto mandos_end;
480
571
}
481
572
482
573
ret = gnutls_record_recv(session, buffer+buffer_length,
490
581
case GNUTLS_E_AGAIN:
491
582
break;
492
583
case GNUTLS_E_REHANDSHAKE:
493
ret = gnutls_handshake (session);
584
do{
585
ret = gnutls_handshake (session);
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
494
587
if (ret < 0){
495
fprintf(stderr, "\n*** Handshake failed ***\n");
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
496
589
gnutls_perror (ret);
497
590
retval = -1;
498
goto exit;
591
goto mandos_end;
499
592
}
500
593
break;
501
594
default:
502
595
fprintf(stderr, "Unknown error while reading data from"
503
" encrypted session with mandos server\n");
596
" encrypted session with Mandos server\n");
504
597
retval = -1;
505
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
506
goto exit;
599
goto mandos_end;
507
600
}
508
601
} else {
509
602
buffer_length += (size_t) ret;
510
603
}
511
604
}
512
605
606
if(debug){
607
fprintf(stderr, "Closing TLS session\n");
608
}
609
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
611
513
612
if (buffer_length > 0){
514
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
515
614
buffer_length,
516
615
&decrypted_buffer,
517
616
keydir);
518
617
if (decrypted_buffer_size >= 0){
618
written = 0;
519
619
while(written < (size_t) decrypted_buffer_size){
520
620
ret = (int)fwrite (decrypted_buffer + written, 1,
521
621
(size_t)decrypted_buffer_size - written,
534
634
} else {
535
635
retval = -1;
536
636
}
537
}
538
539
//shutdown procedure
540
541
if(debug){
542
fprintf(stderr, "Closing TLS session\n");
543
}
544
637
} else {
638
retval = -1;
639
}
640
641
/* Shutdown procedure */
642
643
mandos_end:
545
644
free(buffer);
546
gnutls_bye (session, GNUTLS_SHUT_RDWR);
547
exit:
548
645
close(tcp_sd);
549
646
gnutls_deinit (session);
550
gnutls_certificate_free_credentials (mc->cred);
551
gnutls_global_deinit ();
552
647
return retval;
553
648
}
554
649
567
662
flags,
568
663
void* userdata) {
569
664
mandos_context *mc = userdata;
570
assert(r); /* Spurious warning */
665
assert(r);
571
666
572
667
/* Called whenever a service has been resolved successfully or
573
668
timed out */
575
670
switch (event) {
576
671
default:
577
672
case AVAHI_RESOLVER_FAILURE:
578
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
579
" type '%s' in domain '%s': %s\n", name, type, domain,
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
" of type '%s' in domain '%s': %s\n", name, type, domain,
580
675
avahi_strerror(avahi_server_errno(mc->server)));
581
676
break;
582
677
585
680
char ip[AVAHI_ADDRESS_STR_MAX];
586
681
avahi_address_snprint(ip, sizeof(ip), address);
587
682
if(debug){
588
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
589
" port %d\n", name, host_name, ip, port);
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
590
686
}
591
687
int ret = start_mandos_communication(ip, port, interface, mc);
592
688
if (ret == 0){
593
exit(EXIT_SUCCESS);
689
avahi_simple_poll_quit(mc->simple_poll);
594
690
}
595
691
}
596
692
}
608
704
flags,
609
705
void* userdata) {
610
706
mandos_context *mc = userdata;
611
assert(b); /* Spurious warning */
707
assert(b);
612
708
613
709
/* Called whenever a new services becomes available on the LAN or
614
710
is removed from the LAN */
617
713
default:
618
714
case AVAHI_BROWSER_FAILURE:
619
715
620
fprintf(stderr, "(Browser) %s\n",
716
fprintf(stderr, "(Avahi browser) %s\n",
621
717
avahi_strerror(avahi_server_errno(mc->server)));
622
718
avahi_simple_poll_quit(mc->simple_poll);
623
719
return;
624
720
625
721
case AVAHI_BROWSER_NEW:
626
/* We ignore the returned resolver object. In the callback
627
function we free it. If the server is terminated before
628
the callback function is called the server will free
629
the resolver for us. */
722
/* We ignore the returned Avahi resolver object. In the callback
723
function we free it. If the Avahi server is terminated before
724
the callback function is called the Avahi server will free the
725
resolver for us. */
630
726
631
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
632
728
protocol, name, type, domain,
633
729
AVAHI_PROTO_INET6, 0,
634
730
resolve_callback, mc)))
635
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
636
avahi_strerror(avahi_server_errno(mc->server)));
731
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
637
733
break;
638
734
639
735
case AVAHI_BROWSER_REMOVE:
641
737
642
738
case AVAHI_BROWSER_ALL_FOR_NOW:
643
739
case AVAHI_BROWSER_CACHE_EXHAUSTED:
740
if(debug){
741
fprintf(stderr, "No Mandos server found, still searching...\n");
742
}
644
743
break;
645
744
}
646
745
}
647
746
648
747
/* Combines file name and path and returns the malloced new
649
748
string. some sane checks could/should be added */
650
static const char *combinepath(const char *first, const char *second){
651
size_t f_len = strlen(first);
652
size_t s_len = strlen(second);
653
char *tmp = malloc(f_len + s_len + 2);
654
if (tmp == NULL){
749
static char *combinepath(const char *first, const char *second){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
655
753
return NULL;
656
754
}
657
if(f_len > 0){
658
memcpy(tmp, first, f_len); /* Spurious warning */
659
}
660
tmp[f_len] = '/';
661
if(s_len > 0){
662
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
663
}
664
tmp[f_len + 1 + s_len] = '\0';
665
755
return tmp;
666
756
}
667
757
668
758
669
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
670
AvahiServerConfig config;
759
int main(int argc, char *argv[]){
671
760
AvahiSServiceBrowser *sb = NULL;
672
761
int error;
673
762
int ret;
674
int debug_int;
675
int returncode = EXIT_SUCCESS;
763
int exitcode = EXIT_SUCCESS;
676
764
const char *interface = "eth0";
677
765
struct ifreq network;
678
766
int sd;
767
uid_t uid;
768
gid_t gid;
679
769
char *connect_to = NULL;
680
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
681
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
682
.dh_bits = 1024, .priority = "SECURE256"};
683
684
debug_int = debug ? 1 : 0;
685
while (true){
686
struct option long_options[] = {
687
{"debug", no_argument, &debug_int, 1},
688
{"connect", required_argument, NULL, 'c'},
689
{"interface", required_argument, NULL, 'i'},
690
{"keydir", required_argument, NULL, 'd'},
691
{"seckey", required_argument, NULL, 's'},
692
{"pubkey", required_argument, NULL, 'p'},
693
{"dh-bits", required_argument, NULL, 'D'},
694
{"priority", required_argument, NULL, 'P'},
695
{0, 0, 0, 0} };
696
697
int option_index = 0;
698
ret = getopt_long (argc, argv, "i:", long_options,
699
&option_index);
700
701
if (ret == -1){
702
break;
703
}
704
705
switch(ret){
706
case 0:
707
break;
708
case 'i':
709
interface = optarg;
710
break;
711
case 'c':
712
connect_to = optarg;
713
break;
714
case 'd':
715
keydir = optarg;
716
break;
717
case 'p':
718
pubkeyfile = optarg;
719
break;
720
case 's':
721
seckeyfile = optarg;
722
break;
723
case 'D':
724
errno = 0;
725
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
726
if (errno){
727
perror("strtol");
728
exit(EXIT_FAILURE);
729
}
730
break;
731
case 'P':
732
mc.priority = optarg;
733
break;
734
case '?':
735
default:
736
exit(EXIT_FAILURE);
737
}
738
}
739
debug = debug_int ? true : false;
740
741
pubkeyfile = combinepath(keydir, pubkeyfile);
742
if (pubkeyfile == NULL){
743
perror("combinepath");
744
returncode = EXIT_FAILURE;
745
goto exit;
746
}
747
748
seckeyfile = combinepath(keydir, seckeyfile);
749
if (seckeyfile == NULL){
750
perror("combinepath");
751
goto exit;
776
.dh_bits = 1024, .priority = "SECURE256"
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "ADDRESS:PORT",
786
.doc = "Connect directly to a specific Mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "NAME",
790
.doc = "Interface that will be used to search for Mandos"
791
" servers",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "DIRECTORY",
795
.doc = "Directory to read the OpenPGP key files from",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "FILE",
799
.doc = "OpenPGP secret key file base name",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "FILE",
803
.doc = "OpenPGP public key file base name",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "Bit length of the prime number used in the"
808
" Diffie-Hellman key exchange",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "STRING",
812
.doc = "GnuTLS priority string for the TLS handshake",
813
.group = 1 },
814
{ .name = NULL }
815
};
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128: /* --debug */
823
debug = true;
824
break;
825
case 'c': /* --connect */
826
connect_to = arg;
827
break;
828
case 'i': /* --interface */
829
interface = arg;
830
break;
831
case 'd': /* --keydir */
832
keydir = arg;
833
break;
834
case 's': /* --seckey */
835
seckeyname = arg;
836
break;
837
case 'p': /* --pubkey */
838
pubkeyname = arg;
839
break;
840
case 129: /* --dh-bits */
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130: /* --priority */
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
859
}
860
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from a Mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
}
872
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
892
} else {
893
gnutls_initalized = true;
894
}
895
896
/* If the interface is down, bring it up */
897
{
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
if(sd < 0) {
900
perror("socket");
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
strcpy(network.ifr_name, interface);
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
if(ret == -1){
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
909
goto end;
910
}
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
if(ret == -1){
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
close(sd);
921
}
922
923
uid = getuid();
924
gid = getgid();
925
926
ret = setuid(uid);
927
if (ret == -1){
928
perror("setuid");
929
}
930
931
setgid(gid);
932
if (ret == -1){
933
perror("setgid");
752
934
}
753
935
754
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
763
945
char *address = strrchr(connect_to, ':');
764
946
if(address == NULL){
765
947
fprintf(stderr, "No colon in address\n");
766
exit(EXIT_FAILURE);
948
exitcode = EXIT_FAILURE;
949
goto end;
767
950
}
768
951
errno = 0;
769
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
770
953
if(errno){
771
954
perror("Bad port number");
772
exit(EXIT_FAILURE);
955
exitcode = EXIT_FAILURE;
956
goto end;
773
957
}
774
958
*address = '\0';
775
959
address = connect_to;
776
960
ret = start_mandos_communication(address, port, if_index, &mc);
777
961
if(ret < 0){
778
exit(EXIT_FAILURE);
962
exitcode = EXIT_FAILURE;
779
963
} else {
780
exit(EXIT_SUCCESS);
781
}
782
}
783
784
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
785
if(sd < 0) {
786
perror("socket");
787
returncode = EXIT_FAILURE;
788
goto exit;
789
}
790
strcpy(network.ifr_name, interface); /* Spurious warning */
791
ret = ioctl(sd, SIOCGIFFLAGS, &network);
792
if(ret == -1){
793
794
perror("ioctl SIOCGIFFLAGS");
795
returncode = EXIT_FAILURE;
796
goto exit;
797
}
798
if((network.ifr_flags & IFF_UP) == 0){
799
network.ifr_flags |= IFF_UP;
800
ret = ioctl(sd, SIOCSIFFLAGS, &network);
801
if(ret == -1){
802
perror("ioctl SIOCSIFFLAGS");
803
returncode = EXIT_FAILURE;
804
goto exit;
805
}
806
}
807
close(sd);
964
exitcode = EXIT_SUCCESS;
965
}
966
goto end;
967
}
808
968
809
969
if (not debug){
810
970
avahi_set_log_function(empty_log);
811
971
}
812
972
813
/* Initialize the psuedo-RNG */
973
/* Initialize the pseudo-RNG for Avahi */
814
974
srand((unsigned int) time(NULL));
815
816
/* Allocate main loop object */
817
if (!(mc.simple_poll = avahi_simple_poll_new())) {
818
fprintf(stderr, "Failed to create simple poll object.\n");
819
returncode = EXIT_FAILURE;
820
goto exit;
821
}
822
823
/* Do not publish any local records */
824
avahi_server_config_init(&config);
825
config.publish_hinfo = 0;
826
config.publish_addresses = 0;
827
config.publish_workstation = 0;
828
config.publish_domain = 0;
829
830
/* Allocate a new server */
831
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
832
&config, NULL, NULL, &error);
833
834
/* Free the configuration data */
835
avahi_server_config_free(&config);
836
837
/* Check if creating the server object succeeded */
838
if (!mc.server) {
839
fprintf(stderr, "Failed to create server: %s\n",
975
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
980
" object.\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
}
984
985
{
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
993
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
997
NULL, &error);
998
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1001
}
1002
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
840
1006
avahi_strerror(error));
841
returncode = EXIT_FAILURE;
842
goto exit;
1007
exitcode = EXIT_FAILURE;
1008
goto end;
843
1009
}
844
1010
845
/* Create the service browser */
1011
/* Create the Avahi service browser */
846
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
847
1013
AVAHI_PROTO_INET6,
848
1014
"_mandos._tcp", NULL, 0,
849
1015
browse_callback, &mc);
850
if (!sb) {
1016
if (sb == NULL) {
851
1017
fprintf(stderr, "Failed to create service browser: %s\n",
852
1018
avahi_strerror(avahi_server_errno(mc.server)));
853
returncode = EXIT_FAILURE;
854
goto exit;
1019
exitcode = EXIT_FAILURE;
1020
goto end;
855
1021
}
856
1022
857
1023
/* Run the main loop */
858
1024
859
1025
if (debug){
860
fprintf(stderr, "Starting avahi loop search\n");
1026
fprintf(stderr, "Starting Avahi loop search\n");
861
1027
}
862
1028
863
1029
avahi_simple_poll_loop(mc.simple_poll);
864
1030
865
exit:
866
1031
end:
1032
867
1033
if (debug){
868
1034
fprintf(stderr, "%s exiting\n", argv[0]);
869
1035
}
870
1036
871
1037
/* Cleanup things */
872
if (sb)
1038
if (sb != NULL)
873
1039
avahi_s_service_browser_free(sb);
874
1040
875
if (mc.server)
1041
if (mc.server != NULL)
876
1042
avahi_server_free(mc.server);
877
878
if (mc.simple_poll)
1043
1044
if (mc.simple_poll != NULL)
879
1045
avahi_simple_poll_free(mc.simple_poll);
880
free(pubkeyfile);
881
free(seckeyfile);
882
883
return returncode;
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1048
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1052
}
1053
1054
return exitcode;
884
1055
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0