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- Committer: Björn Påhlsson
- Date: 2009-01-05 22:29:12 UTC
- mfrom: (248 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20090105222912-chcppk4uaxyfbr12
merge
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror() */
40
#include <stdint.h> /* uint16_t, uint32_t */
41
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
45
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
55
connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
59
#include <assert.h> /* assert() */
60
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
44
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
63
SIOCSIFFLAGS, if_indextoname(),
64
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
66
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
getuid(), getgid(), setuid(),
68
setgid() */
69
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
71
#include <argp.h> /* struct argp_option, error_t, struct
72
argp_state, struct argp,
73
argp_parse(), ARGP_KEY_ARG,
74
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
46
75
76
/* Avahi */
77
/* All Avahi types, constants and functions
78
Avahi*, avahi_*,
79
AVAHI_* */
47
80
#include <avahi-core/core.h>
48
81
#include <avahi-core/lookup.h>
49
82
#include <avahi-core/log.h>
51
84
#include <avahi-common/malloc.h>
52
85
#include <avahi-common/error.h>
53
86
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
60
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
87
/* GnuTLS */
88
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
89
functions:
90
gnutls_*
91
init_gnutls_session(),
92
GNUTLS_* */
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
94
GNUTLS_OPENPGP_FMT_BASE64 */
68
95
69
96
/* GPGME */
70
#include <errno.h> /* perror() */
71
#include <gpgme.h>
72
73
/* getopt_long */
74
#include <getopt.h>
97
#include <gpgme.h> /* All GPGME types, constants and
98
functions:
99
gpgme_*
100
GPGME_PROTOCOL_OpenPGP,
101
GPG_ERR_NO_* */
75
102
76
103
#define BUFFER_SIZE 256
77
104
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
105
#define PATHDIR "/conf/conf.d/mandos"
106
#define SECKEY "seckey.txt"
107
#define PUBKEY "pubkey.txt"
81
108
82
109
bool debug = false;
83
84
const char mandos_protocol_version[] = "1";
85
86
/* Used for passing in values through all the callback functions */
110
static const char mandos_protocol_version[] = "1";
111
const char *argp_program_version = "mandos-client " VERSION;
112
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
113
114
/* Used for passing in values through the Avahi callback functions */
87
115
typedef struct {
88
116
AvahiSimplePoll *simple_poll;
89
117
AvahiServer *server;
91
119
unsigned int dh_bits;
92
120
gnutls_dh_params_t dh_params;
93
121
const char *priority;
122
gpgme_ctx_t ctx;
94
123
} mandos_context;
95
124
125
/*
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
128
* "buffer_length" is how much is already used.
129
*/
96
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
97
131
size_t buffer_capacity){
98
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
106
140
}
107
141
108
142
/*
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
143
* Initialize GPGME.
111
144
*/
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
116
gpgme_data_t dh_crypto, dh_plain;
117
gpgme_ctx_t ctx;
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
147
int ret;
118
148
gpgme_error_t rc;
119
ssize_t ret;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
122
149
gpgme_engine_info_t engine_info;
123
150
151
152
/*
153
* Helper function to insert pub and seckey to the enigne keyring.
154
*/
155
bool import_key(const char *filename){
156
int fd;
157
gpgme_data_t pgp_data;
158
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
160
if(fd == -1){
161
perror("open");
162
return false;
163
}
164
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
169
return false;
170
}
171
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
176
return false;
177
}
178
179
ret = TEMP_FAILURE_RETRY(close(fd));
180
if(ret == -1){
181
perror("close");
182
}
183
gpgme_data_release(pgp_data);
184
return true;
185
}
186
124
187
if (debug){
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
188
fprintf(stderr, "Initialize gpgme\n");
126
189
}
127
190
128
191
/* Init GPGME */
131
194
if (rc != GPG_ERR_NO_ERROR){
132
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
133
196
gpgme_strsource(rc), gpgme_strerror(rc));
134
return -1;
197
return false;
135
198
}
136
199
137
/* Set GPGME home directory for the OpenPGP engine only */
200
/* Set GPGME home directory for the OpenPGP engine only */
138
201
rc = gpgme_get_engine_info (&engine_info);
139
202
if (rc != GPG_ERR_NO_ERROR){
140
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
141
204
gpgme_strsource(rc), gpgme_strerror(rc));
142
return -1;
205
return false;
143
206
}
144
207
while(engine_info != NULL){
145
208
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
146
209
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
147
engine_info->file_name, homedir);
210
engine_info->file_name, tempdir);
148
211
break;
149
212
}
150
213
engine_info = engine_info->next;
151
214
}
152
215
if(engine_info == NULL){
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
154
return -1;
216
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
217
return false;
218
}
219
220
/* Create new GPGME "context" */
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
226
}
227
228
if (not import_key(pubkey) or not import_key(seckey)){
229
return false;
230
}
231
232
return true;
233
}
234
235
/*
236
* Decrypt OpenPGP data.
237
* Returns -1 on error
238
*/
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
243
gpgme_data_t dh_crypto, dh_plain;
244
gpgme_error_t rc;
245
ssize_t ret;
246
size_t plaintext_capacity = 0;
247
ssize_t plaintext_length = 0;
248
249
if (debug){
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
155
251
}
156
252
157
253
/* Create new GPGME data buffer from memory cryptotext */
172
268
return -1;
173
269
}
174
270
175
/* Create new GPGME "context" */
176
rc = gpgme_new(&ctx);
177
if (rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
plaintext_length = -1;
181
goto decrypt_end;
182
}
183
184
271
/* Decrypt data from the cryptotext data buffer to the plaintext
185
272
data buffer */
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
187
274
if (rc != GPG_ERR_NO_ERROR){
188
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
189
276
gpgme_strsource(rc), gpgme_strerror(rc));
190
277
plaintext_length = -1;
278
if (debug){
279
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
283
} else {
284
fprintf(stderr, "Unsupported algorithm: %s\n",
285
result->unsupported_algorithm);
286
fprintf(stderr, "Wrong key usage: %u\n",
287
result->wrong_key_usage);
288
if(result->file_name != NULL){
289
fprintf(stderr, "File name: %s\n", result->file_name);
290
}
291
gpgme_recipient_t recipient;
292
recipient = result->recipients;
293
if(recipient){
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
300
? "No" : "Yes");
301
recipient = recipient->next;
302
}
303
}
304
}
305
}
191
306
goto decrypt_end;
192
307
}
193
308
195
310
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
311
}
197
312
198
if (debug){
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
201
if (result == NULL){
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
} else {
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
210
}
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
213
if(recipient){
214
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
219
recipient->status == GPG_ERR_NO_SECKEY
220
? "No" : "Yes");
221
recipient = recipient->next;
222
}
223
}
224
}
225
}
226
227
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
228
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
perror("pgpme_data_seek");
315
perror("gpgme_data_seek");
230
316
plaintext_length = -1;
231
317
goto decrypt_end;
232
318
}
233
319
234
320
*plaintext = NULL;
235
321
while(true){
236
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
322
plaintext_capacity = adjustbuffer(plaintext,
323
(size_t)plaintext_length,
237
324
plaintext_capacity);
238
325
if (plaintext_capacity == 0){
239
326
perror("adjustbuffer");
255
342
}
256
343
plaintext_length += ret;
257
344
}
258
345
259
346
if(debug){
260
347
fprintf(stderr, "Decrypted password is: ");
261
348
for(ssize_t i = 0; i < plaintext_length; i++){
275
362
}
276
363
277
364
static const char * safer_gnutls_strerror (int value) {
278
const char *ret = gnutls_strerror (value);
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
279
366
if (ret == NULL)
280
367
ret = "(unknown)";
281
368
return ret;
287
374
fprintf(stderr, "GnuTLS: %s", string);
288
375
}
289
376
290
static int init_gnutls_global(mandos_context *mc){
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
379
const char *seckeyfilename){
291
380
int ret;
292
381
293
382
if(debug){
294
383
fprintf(stderr, "Initializing GnuTLS\n");
295
384
}
296
297
if ((ret = gnutls_global_init ())
298
!= GNUTLS_E_SUCCESS) {
385
386
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
299
388
fprintf (stderr, "GnuTLS global_init: %s\n",
300
389
safer_gnutls_strerror(ret));
301
390
return -1;
310
399
}
311
400
312
401
/* OpenPGP credentials */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
314
!= GNUTLS_E_SUCCESS) {
315
fprintf (stderr, "GnuTLS memory error: %s\n",
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
316
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
317
408
return -1;
318
409
}
319
410
320
411
if(debug){
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
414
seckeyfilename);
324
415
}
325
416
326
417
ret = gnutls_certificate_set_openpgp_key_file
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
418
(mc->cred, pubkeyfilename, seckeyfilename,
419
GNUTLS_OPENPGP_FMT_BASE64);
328
420
if (ret != GNUTLS_E_SUCCESS) {
329
421
fprintf(stderr,
330
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
333
425
safer_gnutls_strerror(ret));
334
return -1;
426
goto globalfail;
335
427
}
336
428
337
429
/* GnuTLS server initialization */
339
431
if (ret != GNUTLS_E_SUCCESS) {
340
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
341
433
" %s\n", safer_gnutls_strerror(ret));
342
return -1;
434
goto globalfail;
343
435
}
344
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
345
437
if (ret != GNUTLS_E_SUCCESS) {
346
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
347
439
safer_gnutls_strerror(ret));
348
return -1;
440
goto globalfail;
349
441
}
350
442
351
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
352
444
353
445
return 0;
446
447
globalfail:
448
449
gnutls_certificate_free_credentials(mc->cred);
450
gnutls_global_deinit();
451
gnutls_dh_params_deinit(mc->dh_params);
452
return -1;
354
453
}
355
454
356
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
357
457
int ret;
358
458
/* GnuTLS session creation */
359
459
ret = gnutls_init(session, GNUTLS_SERVER);
369
469
fprintf(stderr, "Syntax error at: %s\n", err);
370
470
fprintf(stderr, "GnuTLS error: %s\n",
371
471
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
372
473
return -1;
373
474
}
374
475
}
378
479
if (ret != GNUTLS_E_SUCCESS) {
379
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
380
481
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
381
483
return -1;
382
484
}
383
485
399
501
AvahiIfIndex if_index,
400
502
mandos_context *mc){
401
503
int ret, tcp_sd;
402
struct sockaddr_in6 to;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
403
505
char *buffer = NULL;
404
506
char *decrypted_buffer;
405
507
size_t buffer_length = 0;
409
511
int retval = 0;
410
512
char interface[IF_NAMESIZE];
411
513
gnutls_session_t session;
412
gnutls_dh_params_t dh_params;
413
514
414
515
ret = init_gnutls_session (mc, &session);
415
516
if (ret != 0){
417
518
}
418
519
419
520
if(debug){
420
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
421
ip, port);
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
522
"\n", ip, port);
422
523
}
423
524
424
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
426
527
perror("socket");
427
528
return -1;
428
529
}
429
530
430
531
if(debug){
431
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
432
533
perror("if_indextoname");
435
536
fprintf(stderr, "Binding to interface %s\n", interface);
436
537
}
437
538
438
memset(&to,0,sizeof(to)); /* Spurious warning */
439
to.sin6_family = AF_INET6;
539
memset(&to, 0, sizeof(to));
540
to.in6.sin6_family = AF_INET6;
440
541
/* It would be nice to have a way to detect if we were passed an
441
542
IPv4 address here. Now we assume an IPv6 address. */
442
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
443
544
if (ret < 0 ){
444
545
perror("inet_pton");
445
546
return -1;
448
549
fprintf(stderr, "Bad address: %s\n", ip);
449
550
return -1;
450
551
}
451
to.sin6_port = htons(port); /* Spurious warning */
552
to.in6.sin6_port = htons(port); /* Spurious warning */
452
553
453
to.sin6_scope_id = (uint32_t)if_index;
554
to.in6.sin6_scope_id = (uint32_t)if_index;
454
555
455
556
if(debug){
456
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
558
port);
457
559
char addrstr[INET6_ADDRSTRLEN] = "";
458
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
459
561
sizeof(addrstr)) == NULL){
460
562
perror("inet_ntop");
461
563
} else {
465
567
}
466
568
}
467
569
468
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
570
ret = connect(tcp_sd, &to.in, sizeof(to));
469
571
if (ret < 0){
470
572
perror("connect");
471
573
return -1;
472
574
}
473
575
474
576
const char *out = mandos_protocol_version;
475
577
written = 0;
476
578
while (true){
494
596
}
495
597
}
496
598
}
497
599
498
600
if(debug){
499
601
fprintf(stderr, "Establishing TLS session with %s\n", ip);
500
602
}
501
603
502
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
503
605
504
ret = gnutls_handshake (session);
606
do{
607
ret = gnutls_handshake (session);
608
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
505
609
506
610
if (ret != GNUTLS_E_SUCCESS){
507
611
if(debug){
518
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
519
623
ip);
520
624
}
521
625
522
626
while(true){
523
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
628
buffer_capacity);
524
629
if (buffer_capacity == 0){
525
630
perror("adjustbuffer");
526
631
retval = -1;
538
643
case GNUTLS_E_AGAIN:
539
644
break;
540
645
case GNUTLS_E_REHANDSHAKE:
541
ret = gnutls_handshake (session);
646
do{
647
ret = gnutls_handshake (session);
648
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
542
649
if (ret < 0){
543
650
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
544
651
gnutls_perror (ret);
565
672
gnutls_bye (session, GNUTLS_SHUT_RDWR);
566
673
567
674
if (buffer_length > 0){
568
decrypted_buffer_size = pgp_packet_decrypt(buffer,
675
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
569
676
buffer_length,
570
&decrypted_buffer,
571
keydir);
677
&decrypted_buffer);
572
678
if (decrypted_buffer_size >= 0){
573
679
written = 0;
574
680
while(written < (size_t) decrypted_buffer_size){
589
695
} else {
590
696
retval = -1;
591
697
}
698
} else {
699
retval = -1;
592
700
}
593
701
594
702
/* Shutdown procedure */
595
703
596
704
mandos_end:
597
705
free(buffer);
598
close(tcp_sd);
706
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
707
if(ret == -1){
708
perror("close");
709
}
599
710
gnutls_deinit (session);
600
gnutls_certificate_free_credentials (mc->cred);
601
gnutls_global_deinit ();
602
711
return retval;
603
712
}
604
713
617
726
flags,
618
727
void* userdata) {
619
728
mandos_context *mc = userdata;
620
assert(r); /* Spurious warning */
729
assert(r);
621
730
622
731
/* Called whenever a service has been resolved successfully or
623
732
timed out */
635
744
char ip[AVAHI_ADDRESS_STR_MAX];
636
745
avahi_address_snprint(ip, sizeof(ip), address);
637
746
if(debug){
638
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
639
" port %d\n", name, host_name, ip, interface, port);
747
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
748
PRIu16 ") on port %d\n", name, host_name, ip,
749
interface, port);
640
750
}
641
751
int ret = start_mandos_communication(ip, port, interface, mc);
642
752
if (ret == 0){
643
exit(EXIT_SUCCESS);
753
avahi_simple_poll_quit(mc->simple_poll);
644
754
}
645
755
}
646
756
}
658
768
flags,
659
769
void* userdata) {
660
770
mandos_context *mc = userdata;
661
assert(b); /* Spurious warning */
771
assert(b);
662
772
663
773
/* Called whenever a new services becomes available on the LAN or
664
774
is removed from the LAN */
698
808
}
699
809
}
700
810
701
/* Combines file name and path and returns the malloced new
702
string. some sane checks could/should be added */
703
static const char *combinepath(const char *first, const char *second){
704
size_t f_len = strlen(first);
705
size_t s_len = strlen(second);
706
char *tmp = malloc(f_len + s_len + 2);
707
if (tmp == NULL){
708
return NULL;
709
}
710
if(f_len > 0){
711
memcpy(tmp, first, f_len); /* Spurious warning */
712
}
713
tmp[f_len] = '/';
714
if(s_len > 0){
715
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
716
}
717
tmp[f_len + 1 + s_len] = '\0';
718
return tmp;
719
}
720
721
722
811
int main(int argc, char *argv[]){
723
812
AvahiSServiceBrowser *sb = NULL;
724
813
int error;
730
819
uid_t uid;
731
820
gid_t gid;
732
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
733
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
826
734
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
735
.dh_bits = 1024, .priority = "SECURE256"};
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
736
832
737
833
{
738
/* Temporary int to get the address of for getopt_long */
739
int debug_int = debug ? 1 : 0;
740
while (true){
741
struct option long_options[] = {
742
{"debug", no_argument, &debug_int, 1},
743
{"connect", required_argument, NULL, 'c'},
744
{"interface", required_argument, NULL, 'i'},
745
{"keydir", required_argument, NULL, 'd'},
746
{"seckey", required_argument, NULL, 's'},
747
{"pubkey", required_argument, NULL, 'p'},
748
{"dh-bits", required_argument, NULL, 'D'},
749
{"priority", required_argument, NULL, 'P'},
750
{0, 0, 0, 0} };
751
752
int option_index = 0;
753
ret = getopt_long (argc, argv, "i:", long_options,
754
&option_index);
755
756
if (ret == -1){
757
break;
758
}
759
760
switch(ret){
761
case 0:
762
break;
763
case 'i':
764
interface = optarg;
765
break;
766
case 'c':
767
connect_to = optarg;
768
break;
769
case 'd':
770
keydir = optarg;
771
break;
772
case 'p':
773
pubkeyfile = optarg;
774
break;
775
case 's':
776
seckeyfile = optarg;
777
break;
778
case 'D':
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
840
.group = 1 },
841
{ .name = "interface", .key = 'i',
842
.arg = "NAME",
843
.doc = "Interface that will be used to search for Mandos"
844
" servers",
845
.group = 1 },
846
{ .name = "seckey", .key = 's',
847
.arg = "FILE",
848
.doc = "OpenPGP secret key file base name",
849
.group = 1 },
850
{ .name = "pubkey", .key = 'p',
851
.arg = "FILE",
852
.doc = "OpenPGP public key file base name",
853
.group = 2 },
854
{ .name = "dh-bits", .key = 129,
855
.arg = "BITS",
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
858
.group = 2 },
859
{ .name = "priority", .key = 130,
860
.arg = "STRING",
861
.doc = "GnuTLS priority string for the TLS handshake",
862
.group = 1 },
863
{ .name = NULL }
864
};
865
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
870
switch (key) {
871
case 128: /* --debug */
872
debug = true;
873
break;
874
case 'c': /* --connect */
875
connect_to = arg;
876
break;
877
case 'i': /* --interface */
878
interface = arg;
879
break;
880
case 's': /* --seckey */
881
seckey = arg;
882
break;
883
case 'p': /* --pubkey */
884
pubkey = arg;
885
break;
886
case 129: /* --dh-bits */
779
887
errno = 0;
780
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
781
889
if (errno){
782
890
perror("strtol");
783
891
exit(EXIT_FAILURE);
784
892
}
785
893
break;
786
case 'P':
787
mc.priority = optarg;
788
break;
789
case '?':
894
case 130: /* --priority */
895
mc.priority = arg;
896
break;
897
case ARGP_KEY_ARG:
898
argp_usage (state);
899
case ARGP_KEY_END:
900
break;
790
901
default:
791
/* getopt_long() has already printed a message about the
792
unrcognized option, so just exit. */
793
exit(EXIT_FAILURE);
794
}
795
}
796
/* Set the global debug flag from the temporary int */
797
debug = debug_int ? true : false;
798
}
799
800
pubkeyfile = combinepath(keydir, pubkeyfile);
801
if (pubkeyfile == NULL){
802
perror("combinepath");
803
exitcode = EXIT_FAILURE;
804
goto end;
805
}
806
807
seckeyfile = combinepath(keydir, seckeyfile);
808
if (seckeyfile == NULL){
809
perror("combinepath");
810
goto end;
811
}
812
813
ret = init_gnutls_global(&mc);
814
if (ret == -1){
815
fprintf(stderr, "init_gnutls_global\n");
816
goto end;
817
}
818
902
return ARGP_ERR_UNKNOWN;
903
}
904
return 0;
905
}
906
907
struct argp argp = { .options = options, .parser = parse_opt,
908
.args_doc = "",
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
919
/* If the interface is down, bring it up */
920
{
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
if(sd < 0) {
923
perror("socket");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
strcpy(network.ifr_name, interface);
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
929
if(ret == -1){
930
perror("ioctl SIOCGIFFLAGS");
931
exitcode = EXIT_FAILURE;
932
goto end;
933
}
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
if(ret == -1){
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
ret = TEMP_FAILURE_RETRY(close(sd));
944
if(ret == -1){
945
perror("close");
946
}
947
}
948
819
949
uid = getuid();
820
950
gid = getgid();
821
951
822
952
ret = setuid(uid);
823
953
if (ret == -1){
824
954
perror("setuid");
829
959
perror("setgid");
830
960
}
831
961
962
ret = init_gnutls_global(&mc, pubkey, seckey);
963
if (ret == -1){
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
966
goto end;
967
} else {
968
gnutls_initalized = true;
969
}
970
971
if(mkdtemp(tempdir) == NULL){
972
perror("mkdtemp");
973
tempdir[0] = '\0';
974
goto end;
975
}
976
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
} else {
982
gpgme_initalized = true;
983
}
984
832
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
833
986
if(if_index == 0){
834
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
862
1015
goto end;
863
1016
}
864
1017
865
/* If the interface is down, bring it up */
866
{
867
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
868
if(sd < 0) {
869
perror("socket");
870
exitcode = EXIT_FAILURE;
871
goto end;
872
}
873
strcpy(network.ifr_name, interface); /* Spurious warning */
874
ret = ioctl(sd, SIOCGIFFLAGS, &network);
875
if(ret == -1){
876
perror("ioctl SIOCGIFFLAGS");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
if((network.ifr_flags & IFF_UP) == 0){
881
network.ifr_flags |= IFF_UP;
882
ret = ioctl(sd, SIOCSIFFLAGS, &network);
883
if(ret == -1){
884
perror("ioctl SIOCSIFFLAGS");
885
exitcode = EXIT_FAILURE;
886
goto end;
887
}
888
}
889
close(sd);
890
}
891
892
1018
if (not debug){
893
1019
avahi_set_log_function(empty_log);
894
1020
}
904
1030
exitcode = EXIT_FAILURE;
905
1031
goto end;
906
1032
}
907
1033
908
1034
{
909
1035
AvahiServerConfig config;
910
1036
/* Do not publish any local Zeroconf records */
913
1039
config.publish_addresses = 0;
914
1040
config.publish_workstation = 0;
915
1041
config.publish_domain = 0;
916
1042
917
1043
/* Allocate a new server */
918
1044
mc.server = avahi_server_new(avahi_simple_poll_get
919
1045
(mc.simple_poll), &config, NULL,
920
1046
NULL, &error);
921
1047
922
1048
/* Free the Avahi configuration data */
923
1049
avahi_server_config_free(&config);
924
1050
}
944
1070
}
945
1071
946
1072
/* Run the main loop */
947
1073
948
1074
if (debug){
949
1075
fprintf(stderr, "Starting Avahi loop search\n");
950
1076
}
952
1078
avahi_simple_poll_loop(mc.simple_poll);
953
1079
954
1080
end:
955
1081
956
1082
if (debug){
957
1083
fprintf(stderr, "%s exiting\n", argv[0]);
958
1084
}
963
1089
964
1090
if (mc.server != NULL)
965
1091
avahi_server_free(mc.server);
966
1092
967
1093
if (mc.simple_poll != NULL)
968
1094
avahi_simple_poll_free(mc.simple_poll);
969
free(pubkeyfile);
970
free(seckeyfile);
971
1095
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1100
}
1101
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1104
}
1105
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1108
DIR *d;
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1111
if(d == NULL){
1112
perror("opendir");
1113
} else {
1114
while(true){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1117
break;
1118
}
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1122
direntry->d_name);
1123
if(ret < 0){
1124
perror("asprintf");
1125
continue;
1126
}
1127
ret = unlink(fullname);
1128
if(ret == -1){
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1131
}
1132
free(fullname);
1133
}
1134
}
1135
closedir(d);
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
972
1143
return exitcode;
973
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0