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- Committer: Teddy Hogeborn
- Date: 2008-10-18 11:17:22 UTC
- Revision ID: teddy@fukt.bsnet.se-20081018111722-jtbz35c031lxuuc9
* debian/mandos-client.docs (NEWS): Added.
* debian/mandos.docs (NEWS): - '' -
* debian/mandos.docs (NEWS): - '' -
- 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 Teddy Hogeborn & Björn Påhlsson
13
13
*
14
14
* This program is free software: you can redistribute it and/or
15
15
* modify it under the terms of the GNU General Public License as
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
36
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 */
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, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
44
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
62
SIOCSIFFLAGS, if_indextoname(),
63
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
70
#include <argp.h> /* struct argp_option, error_t, struct
71
argp_state, struct argp,
72
argp_parse(), ARGP_KEY_ARG,
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
46
74
75
/* Avahi */
76
/* All Avahi types, constants and functions
77
Avahi*, avahi_*,
78
AVAHI_* */
47
79
#include <avahi-core/core.h>
48
80
#include <avahi-core/lookup.h>
49
81
#include <avahi-core/log.h>
51
83
#include <avahi-common/malloc.h>
52
84
#include <avahi-common/error.h>
53
85
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 */
86
/* GnuTLS */
87
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
88
functions:
89
gnutls_*
90
init_gnutls_session(),
91
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
68
94
69
95
/* GPGME */
70
#include <errno.h> /* perror() */
71
#include <gpgme.h>
72
73
/* getopt_long */
74
#include <getopt.h>
96
#include <gpgme.h> /* All GPGME types, constants and
97
functions:
98
gpgme_*
99
GPGME_PROTOCOL_OpenPGP,
100
GPG_ERR_NO_* */
75
101
76
102
#define BUFFER_SIZE 256
77
103
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
104
#define PATHDIR "/conf/conf.d/mandos"
105
#define SECKEY "seckey.txt"
106
#define PUBKEY "pubkey.txt"
81
107
82
108
bool debug = false;
83
84
const char mandos_protocol_version[] = "1";
85
86
/* Used for passing in values through all the callback functions */
109
static const char mandos_protocol_version[] = "1";
110
const char *argp_program_version = "mandos-client " VERSION;
111
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
112
113
/* Used for passing in values through the Avahi callback functions */
87
114
typedef struct {
88
115
AvahiSimplePoll *simple_poll;
89
116
AvahiServer *server;
90
117
gnutls_certificate_credentials_t cred;
91
118
unsigned int dh_bits;
119
gnutls_dh_params_t dh_params;
92
120
const char *priority;
121
gpgme_ctx_t ctx;
93
122
} mandos_context;
94
123
124
/*
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
127
* "buffer_length" is how much is already used.
128
*/
95
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
96
130
size_t buffer_capacity){
97
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
105
139
}
106
140
107
141
/*
108
* Decrypt OpenPGP data using keyrings in HOMEDIR.
109
* Returns -1 on error
142
* Initialize GPGME.
110
143
*/
111
static ssize_t pgp_packet_decrypt (const char *cryptotext,
112
size_t crypto_size,
113
char **plaintext,
114
const char *homedir){
115
gpgme_data_t dh_crypto, dh_plain;
116
gpgme_ctx_t ctx;
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
145
const char *pubkey, const char *tempdir){
146
int ret;
117
147
gpgme_error_t rc;
118
ssize_t ret;
119
size_t plaintext_capacity = 0;
120
ssize_t plaintext_length = 0;
121
148
gpgme_engine_info_t engine_info;
122
149
150
151
/*
152
* Helper function to insert pub and seckey to the enigne keyring.
153
*/
154
bool import_key(const char *filename){
155
int fd;
156
gpgme_data_t pgp_data;
157
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
if(fd == -1){
160
perror("open");
161
return false;
162
}
163
164
rc = gpgme_data_new_from_fd(&pgp_data, fd);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
168
return false;
169
}
170
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
gpgme_strsource(rc), gpgme_strerror(rc));
175
return false;
176
}
177
178
ret = TEMP_FAILURE_RETRY(close(fd));
179
if(ret == -1){
180
perror("close");
181
}
182
gpgme_data_release(pgp_data);
183
return true;
184
}
185
123
186
if (debug){
124
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
187
fprintf(stderr, "Initialize gpgme\n");
125
188
}
126
189
127
190
/* Init GPGME */
130
193
if (rc != GPG_ERR_NO_ERROR){
131
194
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
132
195
gpgme_strsource(rc), gpgme_strerror(rc));
133
return -1;
196
return false;
134
197
}
135
198
136
/* Set GPGME home directory for the OpenPGP engine only */
199
/* Set GPGME home directory for the OpenPGP engine only */
137
200
rc = gpgme_get_engine_info (&engine_info);
138
201
if (rc != GPG_ERR_NO_ERROR){
139
202
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
140
203
gpgme_strsource(rc), gpgme_strerror(rc));
141
return -1;
204
return false;
142
205
}
143
206
while(engine_info != NULL){
144
207
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
145
208
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
146
engine_info->file_name, homedir);
209
engine_info->file_name, tempdir);
147
210
break;
148
211
}
149
212
engine_info = engine_info->next;
150
213
}
151
214
if(engine_info == NULL){
152
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
153
return -1;
215
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
216
return false;
217
}
218
219
/* Create new GPGME "context" */
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
225
}
226
227
if (not import_key(pubkey) or not import_key(seckey)){
228
return false;
229
}
230
231
return true;
232
}
233
234
/*
235
* Decrypt OpenPGP data.
236
* Returns -1 on error
237
*/
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
242
gpgme_data_t dh_crypto, dh_plain;
243
gpgme_error_t rc;
244
ssize_t ret;
245
size_t plaintext_capacity = 0;
246
ssize_t plaintext_length = 0;
247
248
if (debug){
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
154
250
}
155
251
156
252
/* Create new GPGME data buffer from memory cryptotext */
171
267
return -1;
172
268
}
173
269
174
/* Create new GPGME "context" */
175
rc = gpgme_new(&ctx);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_new: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
plaintext_length = -1;
180
goto decrypt_end;
181
}
182
183
270
/* Decrypt data from the cryptotext data buffer to the plaintext
184
271
data buffer */
185
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
186
273
if (rc != GPG_ERR_NO_ERROR){
187
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
188
275
gpgme_strsource(rc), gpgme_strerror(rc));
189
276
plaintext_length = -1;
277
if (debug){
278
gpgme_decrypt_result_t result;
279
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
282
} else {
283
fprintf(stderr, "Unsupported algorithm: %s\n",
284
result->unsupported_algorithm);
285
fprintf(stderr, "Wrong key usage: %u\n",
286
result->wrong_key_usage);
287
if(result->file_name != NULL){
288
fprintf(stderr, "File name: %s\n", result->file_name);
289
}
290
gpgme_recipient_t recipient;
291
recipient = result->recipients;
292
if(recipient){
293
while(recipient != NULL){
294
fprintf(stderr, "Public key algorithm: %s\n",
295
gpgme_pubkey_algo_name(recipient->pubkey_algo));
296
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
297
fprintf(stderr, "Secret key available: %s\n",
298
recipient->status == GPG_ERR_NO_SECKEY
299
? "No" : "Yes");
300
recipient = recipient->next;
301
}
302
}
303
}
304
}
190
305
goto decrypt_end;
191
306
}
192
307
194
309
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
195
310
}
196
311
197
if (debug){
198
gpgme_decrypt_result_t result;
199
result = gpgme_op_decrypt_result(ctx);
200
if (result == NULL){
201
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
202
} else {
203
fprintf(stderr, "Unsupported algorithm: %s\n",
204
result->unsupported_algorithm);
205
fprintf(stderr, "Wrong key usage: %d\n",
206
result->wrong_key_usage);
207
if(result->file_name != NULL){
208
fprintf(stderr, "File name: %s\n", result->file_name);
209
}
210
gpgme_recipient_t recipient;
211
recipient = result->recipients;
212
if(recipient){
213
while(recipient != NULL){
214
fprintf(stderr, "Public key algorithm: %s\n",
215
gpgme_pubkey_algo_name(recipient->pubkey_algo));
216
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
217
fprintf(stderr, "Secret key available: %s\n",
218
recipient->status == GPG_ERR_NO_SECKEY
219
? "No" : "Yes");
220
recipient = recipient->next;
221
}
222
}
223
}
224
}
225
226
312
/* Seek back to the beginning of the GPGME plaintext data buffer */
227
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
228
perror("pgpme_data_seek");
314
perror("gpgme_data_seek");
229
315
plaintext_length = -1;
230
316
goto decrypt_end;
231
317
}
232
318
233
319
*plaintext = NULL;
234
320
while(true){
235
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
321
plaintext_capacity = adjustbuffer(plaintext,
322
(size_t)plaintext_length,
236
323
plaintext_capacity);
237
324
if (plaintext_capacity == 0){
238
325
perror("adjustbuffer");
254
341
}
255
342
plaintext_length += ret;
256
343
}
257
344
258
345
if(debug){
259
346
fprintf(stderr, "Decrypted password is: ");
260
347
for(ssize_t i = 0; i < plaintext_length; i++){
274
361
}
275
362
276
363
static const char * safer_gnutls_strerror (int value) {
277
const char *ret = gnutls_strerror (value);
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
278
365
if (ret == NULL)
279
366
ret = "(unknown)";
280
367
return ret;
286
373
fprintf(stderr, "GnuTLS: %s", string);
287
374
}
288
375
289
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
290
gnutls_dh_params_t *dh_params){
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
378
const char *seckeyfilename){
291
379
int ret;
292
380
293
381
if(debug){
294
382
fprintf(stderr, "Initializing GnuTLS\n");
295
383
}
296
297
if ((ret = gnutls_global_init ())
298
!= GNUTLS_E_SUCCESS) {
384
385
ret = gnutls_global_init();
386
if (ret != GNUTLS_E_SUCCESS) {
299
387
fprintf (stderr, "GnuTLS global_init: %s\n",
300
388
safer_gnutls_strerror(ret));
301
389
return -1;
310
398
}
311
399
312
400
/* OpenPGP credentials */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
314
!= GNUTLS_E_SUCCESS) {
315
fprintf (stderr, "GnuTLS memory error: %s\n",
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
316
405
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
317
407
return -1;
318
408
}
319
409
320
410
if(debug){
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
411
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
412
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
413
seckeyfilename);
324
414
}
325
415
326
416
ret = gnutls_certificate_set_openpgp_key_file
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
417
(mc->cred, pubkeyfilename, seckeyfilename,
418
GNUTLS_OPENPGP_FMT_BASE64);
328
419
if (ret != GNUTLS_E_SUCCESS) {
329
420
fprintf(stderr,
330
421
"Error[%d] while reading the OpenPGP key pair ('%s',"
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
423
fprintf(stderr, "The GnuTLS error is: %s\n",
333
424
safer_gnutls_strerror(ret));
334
return -1;
425
goto globalfail;
335
426
}
336
427
337
428
/* GnuTLS server initialization */
338
ret = gnutls_dh_params_init(dh_params);
429
ret = gnutls_dh_params_init(&mc->dh_params);
339
430
if (ret != GNUTLS_E_SUCCESS) {
340
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
341
432
" %s\n", safer_gnutls_strerror(ret));
342
return -1;
433
goto globalfail;
343
434
}
344
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
345
436
if (ret != GNUTLS_E_SUCCESS) {
346
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
347
438
safer_gnutls_strerror(ret));
348
return -1;
439
goto globalfail;
349
440
}
350
441
351
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
352
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
443
444
return 0;
445
446
globalfail:
447
448
gnutls_certificate_free_credentials(mc->cred);
449
gnutls_global_deinit();
450
gnutls_dh_params_deinit(mc->dh_params);
451
return -1;
452
}
453
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
456
int ret;
353
457
/* GnuTLS session creation */
354
458
ret = gnutls_init(session, GNUTLS_SERVER);
355
459
if (ret != GNUTLS_E_SUCCESS){
364
468
fprintf(stderr, "Syntax error at: %s\n", err);
365
469
fprintf(stderr, "GnuTLS error: %s\n",
366
470
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
367
472
return -1;
368
473
}
369
474
}
373
478
if (ret != GNUTLS_E_SUCCESS) {
374
479
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
375
480
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
376
482
return -1;
377
483
}
378
484
394
500
AvahiIfIndex if_index,
395
501
mandos_context *mc){
396
502
int ret, tcp_sd;
397
struct sockaddr_in6 to;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
398
504
char *buffer = NULL;
399
505
char *decrypted_buffer;
400
506
size_t buffer_length = 0;
404
510
int retval = 0;
405
511
char interface[IF_NAMESIZE];
406
512
gnutls_session_t session;
407
gnutls_dh_params_t dh_params;
408
513
409
ret = initgnutls (mc, &session, &dh_params);
514
ret = init_gnutls_session (mc, &session);
410
515
if (ret != 0){
411
516
return -1;
412
517
}
413
518
414
519
if(debug){
415
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
416
ip, port);
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
521
"\n", ip, port);
417
522
}
418
523
419
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
421
526
perror("socket");
422
527
return -1;
423
528
}
424
529
425
530
if(debug){
426
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
427
532
perror("if_indextoname");
430
535
fprintf(stderr, "Binding to interface %s\n", interface);
431
536
}
432
537
433
memset(&to,0,sizeof(to)); /* Spurious warning */
434
to.sin6_family = AF_INET6;
538
memset(&to, 0, sizeof(to));
539
to.in6.sin6_family = AF_INET6;
435
540
/* It would be nice to have a way to detect if we were passed an
436
541
IPv4 address here. Now we assume an IPv6 address. */
437
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
438
543
if (ret < 0 ){
439
544
perror("inet_pton");
440
545
return -1;
443
548
fprintf(stderr, "Bad address: %s\n", ip);
444
549
return -1;
445
550
}
446
to.sin6_port = htons(port); /* Spurious warning */
551
to.in6.sin6_port = htons(port); /* Spurious warning */
447
552
448
to.sin6_scope_id = (uint32_t)if_index;
553
to.in6.sin6_scope_id = (uint32_t)if_index;
449
554
450
555
if(debug){
451
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
557
port);
452
558
char addrstr[INET6_ADDRSTRLEN] = "";
453
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
454
560
sizeof(addrstr)) == NULL){
455
561
perror("inet_ntop");
456
562
} else {
460
566
}
461
567
}
462
568
463
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
569
ret = connect(tcp_sd, &to.in, sizeof(to));
464
570
if (ret < 0){
465
571
perror("connect");
466
572
return -1;
467
573
}
468
574
469
575
const char *out = mandos_protocol_version;
470
576
written = 0;
471
577
while (true){
489
595
}
490
596
}
491
597
}
492
598
493
599
if(debug){
494
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
495
601
}
496
602
497
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
498
604
499
ret = gnutls_handshake (session);
605
do{
606
ret = gnutls_handshake (session);
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
500
608
501
609
if (ret != GNUTLS_E_SUCCESS){
502
610
if(debug){
513
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
514
622
ip);
515
623
}
516
624
517
625
while(true){
518
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
627
buffer_capacity);
519
628
if (buffer_capacity == 0){
520
629
perror("adjustbuffer");
521
630
retval = -1;
533
642
case GNUTLS_E_AGAIN:
534
643
break;
535
644
case GNUTLS_E_REHANDSHAKE:
536
ret = gnutls_handshake (session);
645
do{
646
ret = gnutls_handshake (session);
647
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
537
648
if (ret < 0){
538
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
539
650
gnutls_perror (ret);
560
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
561
672
562
673
if (buffer_length > 0){
563
decrypted_buffer_size = pgp_packet_decrypt(buffer,
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
564
675
buffer_length,
565
&decrypted_buffer,
566
keydir);
676
&decrypted_buffer);
567
677
if (decrypted_buffer_size >= 0){
568
678
written = 0;
569
679
while(written < (size_t) decrypted_buffer_size){
584
694
} else {
585
695
retval = -1;
586
696
}
697
} else {
698
retval = -1;
587
699
}
588
700
589
701
/* Shutdown procedure */
590
702
591
703
mandos_end:
592
704
free(buffer);
593
close(tcp_sd);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
708
}
594
709
gnutls_deinit (session);
595
gnutls_certificate_free_credentials (mc->cred);
596
gnutls_global_deinit ();
597
710
return retval;
598
711
}
599
712
612
725
flags,
613
726
void* userdata) {
614
727
mandos_context *mc = userdata;
615
assert(r); /* Spurious warning */
728
assert(r);
616
729
617
730
/* Called whenever a service has been resolved successfully or
618
731
timed out */
630
743
char ip[AVAHI_ADDRESS_STR_MAX];
631
744
avahi_address_snprint(ip, sizeof(ip), address);
632
745
if(debug){
633
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
634
" port %d\n", name, host_name, ip, interface, port);
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
635
749
}
636
750
int ret = start_mandos_communication(ip, port, interface, mc);
637
751
if (ret == 0){
638
exit(EXIT_SUCCESS);
752
avahi_simple_poll_quit(mc->simple_poll);
639
753
}
640
754
}
641
755
}
653
767
flags,
654
768
void* userdata) {
655
769
mandos_context *mc = userdata;
656
assert(b); /* Spurious warning */
770
assert(b);
657
771
658
772
/* Called whenever a new services becomes available on the LAN or
659
773
is removed from the LAN */
693
807
}
694
808
}
695
809
696
/* Combines file name and path and returns the malloced new
697
string. some sane checks could/should be added */
698
static const char *combinepath(const char *first, const char *second){
699
size_t f_len = strlen(first);
700
size_t s_len = strlen(second);
701
char *tmp = malloc(f_len + s_len + 2);
702
if (tmp == NULL){
703
return NULL;
704
}
705
if(f_len > 0){
706
memcpy(tmp, first, f_len); /* Spurious warning */
707
}
708
tmp[f_len] = '/';
709
if(s_len > 0){
710
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
711
}
712
tmp[f_len + 1 + s_len] = '\0';
713
return tmp;
714
}
715
716
717
810
int main(int argc, char *argv[]){
718
811
AvahiSServiceBrowser *sb = NULL;
719
812
int error;
722
815
const char *interface = "eth0";
723
816
struct ifreq network;
724
817
int sd;
818
uid_t uid;
819
gid_t gid;
725
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
726
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
727
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
728
.dh_bits = 1024, .priority = "SECURE256"};
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
729
831
730
832
{
731
/* Temporary int to get the address of for getopt_long */
732
int debug_int = debug ? 1 : 0;
733
while (true){
734
struct option long_options[] = {
735
{"debug", no_argument, &debug_int, 1},
736
{"connect", required_argument, NULL, 'c'},
737
{"interface", required_argument, NULL, 'i'},
738
{"keydir", required_argument, NULL, 'd'},
739
{"seckey", required_argument, NULL, 's'},
740
{"pubkey", required_argument, NULL, 'p'},
741
{"dh-bits", required_argument, NULL, 'D'},
742
{"priority", required_argument, NULL, 'P'},
743
{0, 0, 0, 0} };
744
745
int option_index = 0;
746
ret = getopt_long (argc, argv, "i:", long_options,
747
&option_index);
748
749
if (ret == -1){
750
break;
751
}
752
753
switch(ret){
754
case 0:
755
break;
756
case 'i':
757
interface = optarg;
758
break;
759
case 'c':
760
connect_to = optarg;
761
break;
762
case 'd':
763
keydir = optarg;
764
break;
765
case 'p':
766
pubkeyfile = optarg;
767
break;
768
case 's':
769
seckeyfile = optarg;
770
break;
771
case 'D':
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
839
.group = 1 },
840
{ .name = "interface", .key = 'i',
841
.arg = "NAME",
842
.doc = "Interface that will be used to search for Mandos"
843
" servers",
844
.group = 1 },
845
{ .name = "seckey", .key = 's',
846
.arg = "FILE",
847
.doc = "OpenPGP secret key file base name",
848
.group = 1 },
849
{ .name = "pubkey", .key = 'p',
850
.arg = "FILE",
851
.doc = "OpenPGP public key file base name",
852
.group = 2 },
853
{ .name = "dh-bits", .key = 129,
854
.arg = "BITS",
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
857
.group = 2 },
858
{ .name = "priority", .key = 130,
859
.arg = "STRING",
860
.doc = "GnuTLS priority string for the TLS handshake",
861
.group = 1 },
862
{ .name = NULL }
863
};
864
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
869
switch (key) {
870
case 128: /* --debug */
871
debug = true;
872
break;
873
case 'c': /* --connect */
874
connect_to = arg;
875
break;
876
case 'i': /* --interface */
877
interface = arg;
878
break;
879
case 's': /* --seckey */
880
seckey = arg;
881
break;
882
case 'p': /* --pubkey */
883
pubkey = arg;
884
break;
885
case 129: /* --dh-bits */
772
886
errno = 0;
773
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
774
888
if (errno){
775
889
perror("strtol");
776
890
exit(EXIT_FAILURE);
777
891
}
778
892
break;
779
case 'P':
780
mc.priority = optarg;
781
break;
782
case '?':
893
case 130: /* --priority */
894
mc.priority = arg;
895
break;
896
case ARGP_KEY_ARG:
897
argp_usage (state);
898
case ARGP_KEY_END:
899
break;
783
900
default:
784
/* getopt_long() has already printed a message about the
785
unrcognized option, so just exit. */
786
exit(EXIT_FAILURE);
787
}
788
}
789
/* Set the global debug flag from the temporary int */
790
debug = debug_int ? true : false;
791
}
792
793
pubkeyfile = combinepath(keydir, pubkeyfile);
794
if (pubkeyfile == NULL){
795
perror("combinepath");
796
exitcode = EXIT_FAILURE;
797
goto end;
798
}
799
800
seckeyfile = combinepath(keydir, seckeyfile);
801
if (seckeyfile == NULL){
802
perror("combinepath");
803
goto end;
901
return ARGP_ERR_UNKNOWN;
902
}
903
return 0;
904
}
905
906
struct argp argp = { .options = options, .parser = parse_opt,
907
.args_doc = "",
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
918
/* If the interface is down, bring it up */
919
{
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
921
if(sd < 0) {
922
perror("socket");
923
exitcode = EXIT_FAILURE;
924
goto end;
925
}
926
strcpy(network.ifr_name, interface);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
if(ret == -1){
929
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
if(ret == -1){
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
}
941
}
942
ret = TEMP_FAILURE_RETRY(close(sd));
943
if(ret == -1){
944
perror("close");
945
}
946
}
947
948
uid = getuid();
949
gid = getgid();
950
951
ret = setuid(uid);
952
if (ret == -1){
953
perror("setuid");
954
}
955
956
setgid(gid);
957
if (ret == -1){
958
perror("setgid");
959
}
960
961
ret = init_gnutls_global(&mc, pubkey, seckey);
962
if (ret == -1){
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
} else {
967
gnutls_initalized = true;
968
}
969
970
if(mkdtemp(tempdir) == NULL){
971
perror("mkdtemp");
972
tempdir[0] = '\0';
973
goto end;
974
}
975
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
} else {
981
gpgme_initalized = true;
804
982
}
805
983
806
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
815
993
char *address = strrchr(connect_to, ':');
816
994
if(address == NULL){
817
995
fprintf(stderr, "No colon in address\n");
818
exit(EXIT_FAILURE);
996
exitcode = EXIT_FAILURE;
997
goto end;
819
998
}
820
999
errno = 0;
821
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
822
1001
if(errno){
823
1002
perror("Bad port number");
824
exit(EXIT_FAILURE);
1003
exitcode = EXIT_FAILURE;
1004
goto end;
825
1005
}
826
1006
*address = '\0';
827
1007
address = connect_to;
828
1008
ret = start_mandos_communication(address, port, if_index, &mc);
829
1009
if(ret < 0){
830
exit(EXIT_FAILURE);
1010
exitcode = EXIT_FAILURE;
831
1011
} else {
832
exit(EXIT_SUCCESS);
833
}
834
}
835
836
/* If the interface is down, bring it up */
837
{
838
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
839
if(sd < 0) {
840
perror("socket");
841
exitcode = EXIT_FAILURE;
842
goto end;
843
}
844
strcpy(network.ifr_name, interface); /* Spurious warning */
845
ret = ioctl(sd, SIOCGIFFLAGS, &network);
846
if(ret == -1){
847
perror("ioctl SIOCGIFFLAGS");
848
exitcode = EXIT_FAILURE;
849
goto end;
850
}
851
if((network.ifr_flags & IFF_UP) == 0){
852
network.ifr_flags |= IFF_UP;
853
ret = ioctl(sd, SIOCSIFFLAGS, &network);
854
if(ret == -1){
855
perror("ioctl SIOCSIFFLAGS");
856
exitcode = EXIT_FAILURE;
857
goto end;
858
}
859
}
860
close(sd);
1012
exitcode = EXIT_SUCCESS;
1013
}
1014
goto end;
861
1015
}
862
1016
863
1017
if (not debug){
875
1029
exitcode = EXIT_FAILURE;
876
1030
goto end;
877
1031
}
878
1032
879
1033
{
880
1034
AvahiServerConfig config;
881
1035
/* Do not publish any local Zeroconf records */
884
1038
config.publish_addresses = 0;
885
1039
config.publish_workstation = 0;
886
1040
config.publish_domain = 0;
887
1041
888
1042
/* Allocate a new server */
889
1043
mc.server = avahi_server_new(avahi_simple_poll_get
890
1044
(mc.simple_poll), &config, NULL,
891
1045
NULL, &error);
892
1046
893
1047
/* Free the Avahi configuration data */
894
1048
avahi_server_config_free(&config);
895
1049
}
915
1069
}
916
1070
917
1071
/* Run the main loop */
918
1072
919
1073
if (debug){
920
1074
fprintf(stderr, "Starting Avahi loop search\n");
921
1075
}
923
1077
avahi_simple_poll_loop(mc.simple_poll);
924
1078
925
1079
end:
926
1080
927
1081
if (debug){
928
1082
fprintf(stderr, "%s exiting\n", argv[0]);
929
1083
}
934
1088
935
1089
if (mc.server != NULL)
936
1090
avahi_server_free(mc.server);
937
1091
938
1092
if (mc.simple_poll != NULL)
939
1093
avahi_simple_poll_free(mc.simple_poll);
940
free(pubkeyfile);
941
free(seckeyfile);
942
1094
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1099
}
1100
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1103
}
1104
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1107
DIR *d;
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1110
if(d == NULL){
1111
perror("opendir");
1112
} else {
1113
while(true){
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1116
break;
1117
}
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1121
direntry->d_name);
1122
if(ret < 0){
1123
perror("asprintf");
1124
continue;
1125
}
1126
ret = unlink(fullname);
1127
if(ret == -1){
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1130
}
1131
free(fullname);
1132
}
1133
}
1134
closedir(d);
1135
}
1136
ret = rmdir(tempdir);
1137
if(ret == -1){
1138
perror("rmdir");
1139
}
1140
}
1141
943
1142
return exitcode;
944
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0