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- Committer: Björn Påhlsson
- Date: 2008-08-03 17:24:47 UTC
- mfrom: (40 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 41.
- Revision ID: belorn@braxen-20080803172447-uma248p1s4cbsp02
merge +
mandosclient
Added a adjustbuffer function.
mandosclient
Added a adjustbuffer function.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
36
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() */
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 */
62
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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 */
45
SIOCSIFFLAGS */
75
46
76
/* Avahi */
77
/* All Avahi types, constants and functions
78
Avahi*, avahi_*,
79
AVAHI_* */
80
47
#include <avahi-core/core.h>
81
48
#include <avahi-core/lookup.h>
82
49
#include <avahi-core/log.h>
84
51
#include <avahi-common/malloc.h>
85
52
#include <avahi-common/error.h>
86
53
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 */
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 */
95
68
96
69
/* GPGME */
97
#include <gpgme.h> /* All GPGME types, constants and
98
functions:
99
gpgme_*
100
GPGME_PROTOCOL_OpenPGP,
101
GPG_ERR_NO_* */
70
#include <errno.h> /* perror() */
71
#include <gpgme.h>
72
73
/* getopt_long */
74
#include <getopt.h>
102
75
103
76
#define BUFFER_SIZE 256
104
77
105
#define PATHDIR "/conf/conf.d/mandos"
106
#define SECKEY "seckey.txt"
107
#define PUBKEY "pubkey.txt"
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
108
81
109
82
bool debug = false;
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 */
83
84
const char mandos_protocol_version[] = "1";
85
86
/* Used for passing in values through all the callback functions */
115
87
typedef struct {
116
88
AvahiSimplePoll *simple_poll;
117
89
AvahiServer *server;
118
90
gnutls_certificate_credentials_t cred;
119
91
unsigned int dh_bits;
120
gnutls_dh_params_t dh_params;
121
92
const char *priority;
122
gpgme_ctx_t ctx;
123
93
} mandos_context;
124
94
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
*/
130
95
size_t adjustbuffer(char **buffer, size_t buffer_length,
131
96
size_t buffer_capacity){
132
97
if (buffer_length + BUFFER_SIZE > buffer_capacity){
140
105
}
141
106
142
107
/*
143
* Initialize GPGME.
108
* Decrypt OpenPGP data using keyrings in HOMEDIR.
109
* Returns -1 on error
144
110
*/
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
147
int ret;
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;
148
117
gpgme_error_t rc;
118
ssize_t ret;
119
size_t plaintext_capacity = 0;
120
ssize_t plaintext_length = 0;
149
121
gpgme_engine_info_t engine_info;
150
122
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 = (int)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 = (int)TEMP_FAILURE_RETRY(close(fd));
180
if(ret == -1){
181
perror("close");
182
}
183
gpgme_data_release(pgp_data);
184
return true;
185
}
186
187
123
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
124
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
189
125
}
190
126
191
127
/* Init GPGME */
194
130
if (rc != GPG_ERR_NO_ERROR){
195
131
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
132
gpgme_strsource(rc), gpgme_strerror(rc));
197
return false;
133
return -1;
198
134
}
199
135
200
/* Set GPGME home directory for the OpenPGP engine only */
136
/* Set GPGME home directory for the OpenPGP engine only */
201
137
rc = gpgme_get_engine_info (&engine_info);
202
138
if (rc != GPG_ERR_NO_ERROR){
203
139
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
140
gpgme_strsource(rc), gpgme_strerror(rc));
205
return false;
141
return -1;
206
142
}
207
143
while(engine_info != NULL){
208
144
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
209
145
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
210
engine_info->file_name, tempdir);
146
engine_info->file_name, homedir);
211
147
break;
212
148
}
213
149
engine_info = engine_info->next;
214
150
}
215
151
if(engine_info == NULL){
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");
152
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
153
return -1;
251
154
}
252
155
253
156
/* Create new GPGME data buffer from memory cryptotext */
268
171
return -1;
269
172
}
270
173
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
271
183
/* Decrypt data from the cryptotext data buffer to the plaintext
272
184
data buffer */
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
185
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
274
186
if (rc != GPG_ERR_NO_ERROR){
275
187
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
188
gpgme_strsource(rc), gpgme_strerror(rc));
277
189
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
}
306
190
goto decrypt_end;
307
191
}
308
192
310
194
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
311
195
}
312
196
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
313
226
/* Seek back to the beginning of the GPGME plaintext data buffer */
314
227
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
315
perror("gpgme_data_seek");
228
perror("pgpme_data_seek");
316
229
plaintext_length = -1;
317
230
goto decrypt_end;
318
231
}
319
232
320
233
*plaintext = NULL;
321
234
while(true){
322
plaintext_capacity = adjustbuffer(plaintext,
323
(size_t)plaintext_length,
235
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
324
236
plaintext_capacity);
325
237
if (plaintext_capacity == 0){
326
238
perror("adjustbuffer");
342
254
}
343
255
plaintext_length += ret;
344
256
}
345
257
346
258
if(debug){
347
259
fprintf(stderr, "Decrypted password is: ");
348
260
for(ssize_t i = 0; i < plaintext_length; i++){
362
274
}
363
275
364
276
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
277
const char *ret = gnutls_strerror (value);
366
278
if (ret == NULL)
367
279
ret = "(unknown)";
368
280
return ret;
374
286
fprintf(stderr, "GnuTLS: %s", string);
375
287
}
376
288
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
379
const char *seckeyfilename){
289
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
290
gnutls_dh_params_t *dh_params){
380
291
int ret;
381
292
382
293
if(debug){
383
294
fprintf(stderr, "Initializing GnuTLS\n");
384
295
}
385
386
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
296
297
if ((ret = gnutls_global_init ())
298
!= GNUTLS_E_SUCCESS) {
388
299
fprintf (stderr, "GnuTLS global_init: %s\n",
389
300
safer_gnutls_strerror(ret));
390
301
return -1;
399
310
}
400
311
401
312
/* OpenPGP credentials */
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
314
!= GNUTLS_E_SUCCESS) {
315
fprintf (stderr, "GnuTLS memory error: %s\n",
406
316
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
408
317
return -1;
409
318
}
410
319
411
320
if(debug){
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
414
seckeyfilename);
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
415
324
}
416
325
417
326
ret = gnutls_certificate_set_openpgp_key_file
418
(mc->cred, pubkeyfilename, seckeyfilename,
419
GNUTLS_OPENPGP_FMT_BASE64);
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
420
328
if (ret != GNUTLS_E_SUCCESS) {
421
329
fprintf(stderr,
422
330
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
425
333
safer_gnutls_strerror(ret));
426
goto globalfail;
334
return -1;
427
335
}
428
336
429
337
/* GnuTLS server initialization */
430
ret = gnutls_dh_params_init(&mc->dh_params);
338
ret = gnutls_dh_params_init(dh_params);
431
339
if (ret != GNUTLS_E_SUCCESS) {
432
340
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
341
" %s\n", safer_gnutls_strerror(ret));
434
goto globalfail;
342
return -1;
435
343
}
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
344
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
437
345
if (ret != GNUTLS_E_SUCCESS) {
438
346
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
347
safer_gnutls_strerror(ret));
440
goto globalfail;
348
return -1;
441
349
}
442
350
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
444
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;
453
}
454
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
457
int ret;
351
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
352
458
353
/* GnuTLS session creation */
459
354
ret = gnutls_init(session, GNUTLS_SERVER);
460
355
if (ret != GNUTLS_E_SUCCESS){
469
364
fprintf(stderr, "Syntax error at: %s\n", err);
470
365
fprintf(stderr, "GnuTLS error: %s\n",
471
366
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
473
367
return -1;
474
368
}
475
369
}
479
373
if (ret != GNUTLS_E_SUCCESS) {
480
374
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
375
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
483
376
return -1;
484
377
}
485
378
501
394
AvahiIfIndex if_index,
502
395
mandos_context *mc){
503
396
int ret, tcp_sd;
504
ssize_t sret;
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
397
struct sockaddr_in6 to;
506
398
char *buffer = NULL;
507
399
char *decrypted_buffer;
508
400
size_t buffer_length = 0;
512
404
int retval = 0;
513
405
char interface[IF_NAMESIZE];
514
406
gnutls_session_t session;
407
gnutls_dh_params_t dh_params;
515
408
516
ret = init_gnutls_session (mc, &session);
409
ret = initgnutls (mc, &session, &dh_params);
517
410
if (ret != 0){
518
411
return -1;
519
412
}
520
413
521
414
if(debug){
522
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
523
"\n", ip, port);
415
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
416
ip, port);
524
417
}
525
418
526
419
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
421
perror("socket");
529
422
return -1;
530
423
}
531
424
532
425
if(debug){
533
426
if(if_indextoname((unsigned int)if_index, interface) == NULL){
534
427
perror("if_indextoname");
537
430
fprintf(stderr, "Binding to interface %s\n", interface);
538
431
}
539
432
540
memset(&to, 0, sizeof(to));
541
to.in6.sin6_family = AF_INET6;
433
memset(&to,0,sizeof(to)); /* Spurious warning */
434
to.sin6_family = AF_INET6;
542
435
/* It would be nice to have a way to detect if we were passed an
543
436
IPv4 address here. Now we assume an IPv6 address. */
544
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
437
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
545
438
if (ret < 0 ){
546
439
perror("inet_pton");
547
440
return -1;
550
443
fprintf(stderr, "Bad address: %s\n", ip);
551
444
return -1;
552
445
}
553
to.in6.sin6_port = htons(port); /* Spurious warning */
446
to.sin6_port = htons(port); /* Spurious warning */
554
447
555
to.in6.sin6_scope_id = (uint32_t)if_index;
448
to.sin6_scope_id = (uint32_t)if_index;
556
449
557
450
if(debug){
558
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
559
port);
451
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
560
452
char addrstr[INET6_ADDRSTRLEN] = "";
561
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
453
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
562
454
sizeof(addrstr)) == NULL){
563
455
perror("inet_ntop");
564
456
} else {
568
460
}
569
461
}
570
462
571
ret = connect(tcp_sd, &to.in, sizeof(to));
463
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
572
464
if (ret < 0){
573
465
perror("connect");
574
466
return -1;
575
467
}
576
468
577
469
const char *out = mandos_protocol_version;
578
470
written = 0;
579
471
while (true){
580
472
size_t out_size = strlen(out);
581
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
473
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
582
474
out_size - written));
583
475
if (ret == -1){
584
476
perror("write");
597
489
}
598
490
}
599
491
}
600
492
601
493
if(debug){
602
494
fprintf(stderr, "Establishing TLS session with %s\n", ip);
603
495
}
604
496
605
497
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
606
498
607
do{
608
ret = gnutls_handshake (session);
609
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
499
ret = gnutls_handshake (session);
610
500
611
501
if (ret != GNUTLS_E_SUCCESS){
612
502
if(debug){
623
513
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
624
514
ip);
625
515
}
626
516
627
517
while(true){
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
629
buffer_capacity);
518
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
630
519
if (buffer_capacity == 0){
631
520
perror("adjustbuffer");
632
521
retval = -1;
633
522
goto mandos_end;
634
523
}
635
524
636
sret = gnutls_record_recv(session, buffer+buffer_length,
637
BUFFER_SIZE);
638
if (sret == 0){
525
ret = gnutls_record_recv(session, buffer+buffer_length,
526
BUFFER_SIZE);
527
if (ret == 0){
639
528
break;
640
529
}
641
if (sret < 0){
642
switch(sret){
530
if (ret < 0){
531
switch(ret){
643
532
case GNUTLS_E_INTERRUPTED:
644
533
case GNUTLS_E_AGAIN:
645
534
break;
646
535
case GNUTLS_E_REHANDSHAKE:
647
do{
648
ret = gnutls_handshake (session);
649
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
536
ret = gnutls_handshake (session);
650
537
if (ret < 0){
651
538
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
652
539
gnutls_perror (ret);
662
549
goto mandos_end;
663
550
}
664
551
} else {
665
buffer_length += (size_t) sret;
552
buffer_length += (size_t) ret;
666
553
}
667
554
}
668
555
673
560
gnutls_bye (session, GNUTLS_SHUT_RDWR);
674
561
675
562
if (buffer_length > 0){
676
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
563
decrypted_buffer_size = pgp_packet_decrypt(buffer,
677
564
buffer_length,
678
&decrypted_buffer);
565
&decrypted_buffer,
566
keydir);
679
567
if (decrypted_buffer_size >= 0){
680
568
written = 0;
681
569
while(written < (size_t) decrypted_buffer_size){
696
584
} else {
697
585
retval = -1;
698
586
}
699
} else {
700
retval = -1;
701
587
}
702
588
703
589
/* Shutdown procedure */
704
590
705
591
mandos_end:
706
592
free(buffer);
707
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
708
if(ret == -1){
709
perror("close");
710
}
593
close(tcp_sd);
711
594
gnutls_deinit (session);
595
gnutls_certificate_free_credentials (mc->cred);
596
gnutls_global_deinit ();
712
597
return retval;
713
598
}
714
599
727
612
flags,
728
613
void* userdata) {
729
614
mandos_context *mc = userdata;
730
assert(r);
615
assert(r); /* Spurious warning */
731
616
732
617
/* Called whenever a service has been resolved successfully or
733
618
timed out */
745
630
char ip[AVAHI_ADDRESS_STR_MAX];
746
631
avahi_address_snprint(ip, sizeof(ip), address);
747
632
if(debug){
748
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
749
PRIu16 ") on port %d\n", name, host_name, ip,
750
interface, port);
633
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
634
" port %d\n", name, host_name, ip, interface, port);
751
635
}
752
636
int ret = start_mandos_communication(ip, port, interface, mc);
753
637
if (ret == 0){
754
avahi_simple_poll_quit(mc->simple_poll);
638
exit(EXIT_SUCCESS);
755
639
}
756
640
}
757
641
}
769
653
flags,
770
654
void* userdata) {
771
655
mandos_context *mc = userdata;
772
assert(b);
656
assert(b); /* Spurious warning */
773
657
774
658
/* Called whenever a new services becomes available on the LAN or
775
659
is removed from the LAN */
809
693
}
810
694
}
811
695
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
812
717
int main(int argc, char *argv[]){
813
718
AvahiSServiceBrowser *sb = NULL;
814
719
int error;
817
722
const char *interface = "eth0";
818
723
struct ifreq network;
819
724
int sd;
820
uid_t uid;
821
gid_t gid;
822
725
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
824
726
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
827
828
727
mandos_context mc = { .simple_poll = NULL, .server = NULL,
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
728
.dh_bits = 1024, .priority = "SECURE256"};
833
729
834
730
{
835
struct argp_option options[] = {
836
{ .name = "debug", .key = 128,
837
.doc = "Debug mode", .group = 3 },
838
{ .name = "connect", .key = 'c',
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
841
.group = 1 },
842
{ .name = "interface", .key = 'i',
843
.arg = "NAME",
844
.doc = "Interface that will be used to search for Mandos"
845
" servers",
846
.group = 1 },
847
{ .name = "seckey", .key = 's',
848
.arg = "FILE",
849
.doc = "OpenPGP secret key file base name",
850
.group = 1 },
851
{ .name = "pubkey", .key = 'p',
852
.arg = "FILE",
853
.doc = "OpenPGP public key file base name",
854
.group = 2 },
855
{ .name = "dh-bits", .key = 129,
856
.arg = "BITS",
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
859
.group = 2 },
860
{ .name = "priority", .key = 130,
861
.arg = "STRING",
862
.doc = "GnuTLS priority string for the TLS handshake",
863
.group = 1 },
864
{ .name = NULL }
865
};
866
867
error_t parse_opt (int key, char *arg,
868
struct argp_state *state) {
869
/* Get the INPUT argument from `argp_parse', which we know is
870
a pointer to our plugin list pointer. */
871
switch (key) {
872
case 128: /* --debug */
873
debug = true;
874
break;
875
case 'c': /* --connect */
876
connect_to = arg;
877
break;
878
case 'i': /* --interface */
879
interface = arg;
880
break;
881
case 's': /* --seckey */
882
seckey = arg;
883
break;
884
case 'p': /* --pubkey */
885
pubkey = arg;
886
break;
887
case 129: /* --dh-bits */
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':
888
772
errno = 0;
889
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
773
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
890
774
if (errno){
891
775
perror("strtol");
892
776
exit(EXIT_FAILURE);
893
777
}
894
778
break;
895
case 130: /* --priority */
896
mc.priority = arg;
897
break;
898
case ARGP_KEY_ARG:
899
argp_usage (state);
900
case ARGP_KEY_END:
901
break;
779
case 'P':
780
mc.priority = optarg;
781
break;
782
case '?':
902
783
default:
903
return ARGP_ERR_UNKNOWN;
904
}
905
return 0;
906
}
907
908
struct argp argp = { .options = options, .parser = parse_opt,
909
.args_doc = "",
910
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
913
if (ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
920
/* If the interface is down, bring it up */
921
{
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
if(sd < 0) {
924
perror("socket");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
if(ret == -1){
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
933
goto end;
934
}
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
if(ret == -1){
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
941
goto end;
942
}
943
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
948
}
949
950
uid = getuid();
951
gid = getgid();
952
953
ret = setuid(uid);
954
if (ret == -1){
955
perror("setuid");
956
}
957
958
setgid(gid);
959
if (ret == -1){
960
perror("setgid");
961
}
962
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if (ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
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;
984
804
}
985
805
986
806
if_index = (AvahiIfIndex) if_nametoindex(interface);
995
815
char *address = strrchr(connect_to, ':');
996
816
if(address == NULL){
997
817
fprintf(stderr, "No colon in address\n");
998
exitcode = EXIT_FAILURE;
999
goto end;
818
exit(EXIT_FAILURE);
1000
819
}
1001
820
errno = 0;
1002
821
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1003
822
if(errno){
1004
823
perror("Bad port number");
1005
exitcode = EXIT_FAILURE;
1006
goto end;
824
exit(EXIT_FAILURE);
1007
825
}
1008
826
*address = '\0';
1009
827
address = connect_to;
1010
828
ret = start_mandos_communication(address, port, if_index, &mc);
1011
829
if(ret < 0){
1012
exitcode = EXIT_FAILURE;
830
exit(EXIT_FAILURE);
1013
831
} else {
1014
exitcode = EXIT_SUCCESS;
1015
}
1016
goto end;
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);
1017
861
}
1018
862
1019
863
if (not debug){
1031
875
exitcode = EXIT_FAILURE;
1032
876
goto end;
1033
877
}
1034
878
1035
879
{
1036
880
AvahiServerConfig config;
1037
881
/* Do not publish any local Zeroconf records */
1040
884
config.publish_addresses = 0;
1041
885
config.publish_workstation = 0;
1042
886
config.publish_domain = 0;
1043
887
1044
888
/* Allocate a new server */
1045
889
mc.server = avahi_server_new(avahi_simple_poll_get
1046
890
(mc.simple_poll), &config, NULL,
1047
891
NULL, &error);
1048
892
1049
893
/* Free the Avahi configuration data */
1050
894
avahi_server_config_free(&config);
1051
895
}
1071
915
}
1072
916
1073
917
/* Run the main loop */
1074
918
1075
919
if (debug){
1076
920
fprintf(stderr, "Starting Avahi loop search\n");
1077
921
}
1079
923
avahi_simple_poll_loop(mc.simple_poll);
1080
924
1081
925
end:
1082
926
1083
927
if (debug){
1084
928
fprintf(stderr, "%s exiting\n", argv[0]);
1085
929
}
1090
934
1091
935
if (mc.server != NULL)
1092
936
avahi_server_free(mc.server);
1093
937
1094
938
if (mc.simple_poll != NULL)
1095
939
avahi_simple_poll_free(mc.simple_poll);
1096
1097
if (gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit ();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
closedir(d);
1137
}
1138
ret = rmdir(tempdir);
1139
if(ret == -1){
1140
perror("rmdir");
1141
}
1142
}
1143
940
free(pubkeyfile);
941
free(seckeyfile);
942
1144
943
return exitcode;
1145
944
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0