To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandosclient.c
- browse files at revision 40
- compare with another revision
- download diff
- download tarball
- view history from revision 40
- Committer: Teddy Hogeborn
- Date: 2008-08-03 16:05:52 UTC
- Revision ID: teddy@fukt.bsnet.se-20080803160552-mvqy5klry3wn57x1
* plugins.d/mandosclient.c (initgnutls): Moved "err" variable into its
own code block.
(start_mandos_communication): Moved call to "initgnutls" to
beginning. Renamed label "exit" to
"mandos_end". Bug fix: set return
code if failure to realloc buffer.
Close TLS session as early as
possible.
(resolve_callback): Also print interface number when debugging.
(main): Moved "debug_int" and "config" into their own respective
code blocks.
own code block.
(start_mandos_communication): Moved call to "initgnutls" to
beginning. Renamed label "exit" to
"mandos_end". Bug fix: set return
code if failure to realloc buffer.
Close TLS session as early as
possible.
(resolve_callback): Also print interface number when debugging.
(main): Moved "debug_int" and "config" into their own respective
code blocks.
- 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
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2007-2008 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(), asprintf() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
40
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, 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() */
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
41
SIOCSIFFLAGS */
61
42
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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 */
43
SIOCSIFFLAGS */
74
44
75
/* Avahi */
76
/* All Avahi types, constants and functions
77
Avahi*, avahi_*,
78
AVAHI_* */
79
45
#include <avahi-core/core.h>
80
46
#include <avahi-core/lookup.h>
81
47
#include <avahi-core/log.h>
83
49
#include <avahi-common/malloc.h>
84
50
#include <avahi-common/error.h>
85
51
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 */
52
/* Mandos client part */
53
#include <sys/types.h> /* socket(), inet_pton() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
58
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
65
#include <net/if.h> /* IF_NAMESIZE */
94
66
95
67
/* GPGME */
96
#include <gpgme.h> /* All GPGME types, constants and
97
functions:
98
gpgme_*
99
GPGME_PROTOCOL_OpenPGP,
100
GPG_ERR_NO_* */
68
#include <errno.h> /* perror() */
69
#include <gpgme.h>
70
71
/* getopt_long */
72
#include <getopt.h>
101
73
102
74
#define BUFFER_SIZE 256
103
75
104
#define PATHDIR "/conf/conf.d/mandos"
105
#define SECKEY "seckey.txt"
106
#define PUBKEY "pubkey.txt"
76
static const char *keydir = "/conf/conf.d/mandos";
77
static const char *pubkeyfile = "pubkey.txt";
78
static const char *seckeyfile = "seckey.txt";
107
79
108
80
bool debug = false;
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
81
113
/* Used for passing in values through the Avahi callback functions */
82
/* Used for passing in values through all the callback functions */
114
83
typedef struct {
115
84
AvahiSimplePoll *simple_poll;
116
85
AvahiServer *server;
117
86
gnutls_certificate_credentials_t cred;
118
87
unsigned int dh_bits;
119
gnutls_dh_params_t dh_params;
120
88
const char *priority;
89
} mandos_context;
90
91
/*
92
* Decrypt OpenPGP data using keyrings in HOMEDIR.
93
* Returns -1 on error
94
*/
95
static ssize_t pgp_packet_decrypt (const char *cryptotext,
96
size_t crypto_size,
97
char **plaintext,
98
const char *homedir){
99
gpgme_data_t dh_crypto, dh_plain;
121
100
gpgme_ctx_t ctx;
122
} mandos_context;
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
*/
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
130
size_t buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
132
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
133
if (buffer == NULL){
134
return 0;
135
}
136
buffer_capacity += BUFFER_SIZE;
137
}
138
return buffer_capacity;
139
}
140
141
/*
142
* Initialize GPGME.
143
*/
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
145
const char *pubkey, const char *tempdir){
146
int ret;
147
101
gpgme_error_t rc;
102
ssize_t ret;
103
size_t plaintext_capacity = 0;
104
ssize_t plaintext_length = 0;
148
105
gpgme_engine_info_t engine_info;
149
106
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
186
107
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
108
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
188
109
}
189
110
190
111
/* Init GPGME */
193
114
if (rc != GPG_ERR_NO_ERROR){
194
115
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
195
116
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
117
return -1;
197
118
}
198
119
199
/* Set GPGME home directory for the OpenPGP engine only */
120
/* Set GPGME home directory for the OpenPGP engine only */
200
121
rc = gpgme_get_engine_info (&engine_info);
201
122
if (rc != GPG_ERR_NO_ERROR){
202
123
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
203
124
gpgme_strsource(rc), gpgme_strerror(rc));
204
return false;
125
return -1;
205
126
}
206
127
while(engine_info != NULL){
207
128
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
208
129
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
209
engine_info->file_name, tempdir);
130
engine_info->file_name, homedir);
210
131
break;
211
132
}
212
133
engine_info = engine_info->next;
213
134
}
214
135
if(engine_info == NULL){
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");
136
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
137
return -1;
250
138
}
251
139
252
140
/* Create new GPGME data buffer from memory cryptotext */
267
155
return -1;
268
156
}
269
157
158
/* Create new GPGME "context" */
159
rc = gpgme_new(&ctx);
160
if (rc != GPG_ERR_NO_ERROR){
161
fprintf(stderr, "bad gpgme_new: %s: %s\n",
162
gpgme_strsource(rc), gpgme_strerror(rc));
163
plaintext_length = -1;
164
goto decrypt_end;
165
}
166
270
167
/* Decrypt data from the cryptotext data buffer to the plaintext
271
168
data buffer */
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
169
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
273
170
if (rc != GPG_ERR_NO_ERROR){
274
171
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
172
gpgme_strsource(rc), gpgme_strerror(rc));
276
173
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
}
305
174
goto decrypt_end;
306
175
}
307
176
309
178
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
310
179
}
311
180
181
if (debug){
182
gpgme_decrypt_result_t result;
183
result = gpgme_op_decrypt_result(ctx);
184
if (result == NULL){
185
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
186
} else {
187
fprintf(stderr, "Unsupported algorithm: %s\n",
188
result->unsupported_algorithm);
189
fprintf(stderr, "Wrong key usage: %d\n",
190
result->wrong_key_usage);
191
if(result->file_name != NULL){
192
fprintf(stderr, "File name: %s\n", result->file_name);
193
}
194
gpgme_recipient_t recipient;
195
recipient = result->recipients;
196
if(recipient){
197
while(recipient != NULL){
198
fprintf(stderr, "Public key algorithm: %s\n",
199
gpgme_pubkey_algo_name(recipient->pubkey_algo));
200
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
201
fprintf(stderr, "Secret key available: %s\n",
202
recipient->status == GPG_ERR_NO_SECKEY
203
? "No" : "Yes");
204
recipient = recipient->next;
205
}
206
}
207
}
208
}
209
312
210
/* Seek back to the beginning of the GPGME plaintext data buffer */
313
211
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
314
perror("gpgme_data_seek");
212
perror("pgpme_data_seek");
315
213
plaintext_length = -1;
316
214
goto decrypt_end;
317
215
}
318
216
319
217
*plaintext = NULL;
320
218
while(true){
321
plaintext_capacity = adjustbuffer(plaintext,
322
(size_t)plaintext_length,
323
plaintext_capacity);
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
219
if (plaintext_length + BUFFER_SIZE
220
> (ssize_t) plaintext_capacity){
221
*plaintext = realloc(*plaintext, plaintext_capacity
222
+ BUFFER_SIZE);
223
if (*plaintext == NULL){
224
perror("realloc");
326
225
plaintext_length = -1;
327
226
goto decrypt_end;
227
}
228
plaintext_capacity += BUFFER_SIZE;
328
229
}
329
230
330
231
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
341
242
}
342
243
plaintext_length += ret;
343
244
}
344
245
345
246
if(debug){
346
247
fprintf(stderr, "Decrypted password is: ");
347
248
for(ssize_t i = 0; i < plaintext_length; i++){
361
262
}
362
263
363
264
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
265
const char *ret = gnutls_strerror (value);
365
266
if (ret == NULL)
366
267
ret = "(unknown)";
367
268
return ret;
373
274
fprintf(stderr, "GnuTLS: %s", string);
374
275
}
375
276
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
378
const char *seckeyfilename){
277
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
278
gnutls_dh_params_t *dh_params){
379
279
int ret;
380
280
381
281
if(debug){
382
282
fprintf(stderr, "Initializing GnuTLS\n");
383
283
}
384
385
ret = gnutls_global_init();
386
if (ret != GNUTLS_E_SUCCESS) {
284
285
if ((ret = gnutls_global_init ())
286
!= GNUTLS_E_SUCCESS) {
387
287
fprintf (stderr, "GnuTLS global_init: %s\n",
388
288
safer_gnutls_strerror(ret));
389
289
return -1;
398
298
}
399
299
400
300
/* OpenPGP credentials */
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
301
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "GnuTLS memory error: %s\n",
405
304
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
407
305
return -1;
408
306
}
409
307
410
308
if(debug){
411
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
412
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
413
seckeyfilename);
309
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
310
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
311
seckeyfile);
414
312
}
415
313
416
314
ret = gnutls_certificate_set_openpgp_key_file
417
(mc->cred, pubkeyfilename, seckeyfilename,
418
GNUTLS_OPENPGP_FMT_BASE64);
315
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
419
316
if (ret != GNUTLS_E_SUCCESS) {
420
317
fprintf(stderr,
421
318
"Error[%d] while reading the OpenPGP key pair ('%s',"
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
423
fprintf(stderr, "The GnuTLS error is: %s\n",
319
" '%s')\n", ret, pubkeyfile, seckeyfile);
320
fprintf(stdout, "The GnuTLS error is: %s\n",
424
321
safer_gnutls_strerror(ret));
425
goto globalfail;
322
return -1;
426
323
}
427
324
428
325
/* GnuTLS server initialization */
429
ret = gnutls_dh_params_init(&mc->dh_params);
326
ret = gnutls_dh_params_init(dh_params);
430
327
if (ret != GNUTLS_E_SUCCESS) {
431
328
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
329
" %s\n", safer_gnutls_strerror(ret));
433
goto globalfail;
330
return -1;
434
331
}
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
332
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
436
333
if (ret != GNUTLS_E_SUCCESS) {
437
334
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
335
safer_gnutls_strerror(ret));
439
goto globalfail;
336
return -1;
440
337
}
441
338
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;
339
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
340
457
341
/* GnuTLS session creation */
458
342
ret = gnutls_init(session, GNUTLS_SERVER);
459
343
if (ret != GNUTLS_E_SUCCESS){
468
352
fprintf(stderr, "Syntax error at: %s\n", err);
469
353
fprintf(stderr, "GnuTLS error: %s\n",
470
354
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
472
355
return -1;
473
356
}
474
357
}
478
361
if (ret != GNUTLS_E_SUCCESS) {
479
362
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
480
363
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
482
364
return -1;
483
365
}
484
366
500
382
AvahiIfIndex if_index,
501
383
mandos_context *mc){
502
384
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
385
struct sockaddr_in6 to;
504
386
char *buffer = NULL;
505
387
char *decrypted_buffer;
506
388
size_t buffer_length = 0;
507
389
size_t buffer_capacity = 0;
508
390
ssize_t decrypted_buffer_size;
509
size_t written;
391
size_t written = 0;
510
392
int retval = 0;
511
393
char interface[IF_NAMESIZE];
512
394
gnutls_session_t session;
395
gnutls_dh_params_t dh_params;
513
396
514
ret = init_gnutls_session (mc, &session);
397
ret = initgnutls (mc, &session, &dh_params);
515
398
if (ret != 0){
516
399
return -1;
517
400
}
518
401
519
402
if(debug){
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
521
"\n", ip, port);
403
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
404
ip, port);
522
405
}
523
406
524
407
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
526
409
perror("socket");
527
410
return -1;
528
411
}
529
412
530
413
if(debug){
531
414
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
415
perror("if_indextoname");
535
418
fprintf(stderr, "Binding to interface %s\n", interface);
536
419
}
537
420
538
memset(&to, 0, sizeof(to));
539
to.in6.sin6_family = AF_INET6;
421
memset(&to,0,sizeof(to)); /* Spurious warning */
422
to.sin6_family = AF_INET6;
540
423
/* It would be nice to have a way to detect if we were passed an
541
424
IPv4 address here. Now we assume an IPv6 address. */
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
425
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
543
426
if (ret < 0 ){
544
427
perror("inet_pton");
545
428
return -1;
548
431
fprintf(stderr, "Bad address: %s\n", ip);
549
432
return -1;
550
433
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
434
to.sin6_port = htons(port); /* Spurious warning */
552
435
553
to.in6.sin6_scope_id = (uint32_t)if_index;
436
to.sin6_scope_id = (uint32_t)if_index;
554
437
555
438
if(debug){
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
557
port);
439
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
558
440
char addrstr[INET6_ADDRSTRLEN] = "";
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
441
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
560
442
sizeof(addrstr)) == NULL){
561
443
perror("inet_ntop");
562
444
} else {
566
448
}
567
449
}
568
450
569
ret = connect(tcp_sd, &to.in, sizeof(to));
451
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
570
452
if (ret < 0){
571
453
perror("connect");
572
454
return -1;
573
455
}
574
456
575
const char *out = mandos_protocol_version;
576
written = 0;
577
while (true){
578
size_t out_size = strlen(out);
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
out_size - written));
581
if (ret == -1){
582
perror("write");
583
retval = -1;
584
goto mandos_end;
585
}
586
written += (size_t)ret;
587
if(written < out_size){
588
continue;
589
} else {
590
if (out == mandos_protocol_version){
591
written = 0;
592
out = "\r\n";
593
} else {
594
break;
595
}
596
}
597
}
598
599
457
if(debug){
600
458
fprintf(stderr, "Establishing TLS session with %s\n", ip);
601
459
}
602
460
603
461
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
604
462
605
do{
606
ret = gnutls_handshake (session);
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
463
ret = gnutls_handshake (session);
608
464
609
465
if (ret != GNUTLS_E_SUCCESS){
610
466
if(debug){
621
477
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
622
478
ip);
623
479
}
624
480
625
481
while(true){
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
627
buffer_capacity);
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
630
retval = -1;
631
goto mandos_end;
482
if (buffer_length + BUFFER_SIZE > buffer_capacity){
483
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
484
if (buffer == NULL){
485
perror("realloc");
486
retval = -1;
487
goto mandos_end;
488
}
489
buffer_capacity += BUFFER_SIZE;
632
490
}
633
491
634
492
ret = gnutls_record_recv(session, buffer+buffer_length,
642
500
case GNUTLS_E_AGAIN:
643
501
break;
644
502
case GNUTLS_E_REHANDSHAKE:
645
do{
646
ret = gnutls_handshake (session);
647
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
503
ret = gnutls_handshake (session);
648
504
if (ret < 0){
649
505
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
506
gnutls_perror (ret);
671
527
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
528
673
529
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
530
decrypted_buffer_size = pgp_packet_decrypt(buffer,
675
531
buffer_length,
676
&decrypted_buffer);
532
&decrypted_buffer,
533
keydir);
677
534
if (decrypted_buffer_size >= 0){
678
written = 0;
679
535
while(written < (size_t) decrypted_buffer_size){
680
536
ret = (int)fwrite (decrypted_buffer + written, 1,
681
537
(size_t)decrypted_buffer_size - written,
694
550
} else {
695
551
retval = -1;
696
552
}
697
} else {
698
retval = -1;
699
553
}
700
554
701
555
/* Shutdown procedure */
702
556
703
557
mandos_end:
704
558
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
708
}
559
close(tcp_sd);
709
560
gnutls_deinit (session);
561
gnutls_certificate_free_credentials (mc->cred);
562
gnutls_global_deinit ();
710
563
return retval;
711
564
}
712
565
725
578
flags,
726
579
void* userdata) {
727
580
mandos_context *mc = userdata;
728
assert(r);
581
assert(r); /* Spurious warning */
729
582
730
583
/* Called whenever a service has been resolved successfully or
731
584
timed out */
743
596
char ip[AVAHI_ADDRESS_STR_MAX];
744
597
avahi_address_snprint(ip, sizeof(ip), address);
745
598
if(debug){
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
599
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
600
" port %d\n", name, host_name, ip, interface, port);
749
601
}
750
602
int ret = start_mandos_communication(ip, port, interface, mc);
751
603
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
604
exit(EXIT_SUCCESS);
753
605
}
754
606
}
755
607
}
767
619
flags,
768
620
void* userdata) {
769
621
mandos_context *mc = userdata;
770
assert(b);
622
assert(b); /* Spurious warning */
771
623
772
624
/* Called whenever a new services becomes available on the LAN or
773
625
is removed from the LAN */
807
659
}
808
660
}
809
661
662
/* Combines file name and path and returns the malloced new
663
string. some sane checks could/should be added */
664
static const char *combinepath(const char *first, const char *second){
665
size_t f_len = strlen(first);
666
size_t s_len = strlen(second);
667
char *tmp = malloc(f_len + s_len + 2);
668
if (tmp == NULL){
669
return NULL;
670
}
671
if(f_len > 0){
672
memcpy(tmp, first, f_len); /* Spurious warning */
673
}
674
tmp[f_len] = '/';
675
if(s_len > 0){
676
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
677
}
678
tmp[f_len + 1 + s_len] = '\0';
679
return tmp;
680
}
681
682
810
683
int main(int argc, char *argv[]){
811
684
AvahiSServiceBrowser *sb = NULL;
812
685
int error;
815
688
const char *interface = "eth0";
816
689
struct ifreq network;
817
690
int sd;
818
uid_t uid;
819
gid_t gid;
820
691
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
692
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
826
693
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
694
.dh_bits = 1024, .priority = "SECURE256"};
831
695
832
696
{
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 */
697
/* Temporary int to get the address of for getopt_long */
698
int debug_int = debug ? 1 : 0;
699
while (true){
700
struct option long_options[] = {
701
{"debug", no_argument, &debug_int, 1},
702
{"connect", required_argument, NULL, 'c'},
703
{"interface", required_argument, NULL, 'i'},
704
{"keydir", required_argument, NULL, 'd'},
705
{"seckey", required_argument, NULL, 's'},
706
{"pubkey", required_argument, NULL, 'p'},
707
{"dh-bits", required_argument, NULL, 'D'},
708
{"priority", required_argument, NULL, 'P'},
709
{0, 0, 0, 0} };
710
711
int option_index = 0;
712
ret = getopt_long (argc, argv, "i:", long_options,
713
&option_index);
714
715
if (ret == -1){
716
break;
717
}
718
719
switch(ret){
720
case 0:
721
break;
722
case 'i':
723
interface = optarg;
724
break;
725
case 'c':
726
connect_to = optarg;
727
break;
728
case 'd':
729
keydir = optarg;
730
break;
731
case 'p':
732
pubkeyfile = optarg;
733
break;
734
case 's':
735
seckeyfile = optarg;
736
break;
737
case 'D':
886
738
errno = 0;
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
739
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
888
740
if (errno){
889
741
perror("strtol");
890
742
exit(EXIT_FAILURE);
891
743
}
892
744
break;
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;
745
case 'P':
746
mc.priority = optarg;
747
break;
748
case '?':
900
749
default:
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;
750
/* getopt_long() has already printed a message about the
751
unrcognized option, so just exit. */
752
exit(EXIT_FAILURE);
753
}
754
}
755
/* Set the global debug flag from the temporary int */
756
debug = debug_int ? true : false;
757
}
758
759
pubkeyfile = combinepath(keydir, pubkeyfile);
760
if (pubkeyfile == NULL){
761
perror("combinepath");
762
exitcode = EXIT_FAILURE;
763
goto end;
764
}
765
766
seckeyfile = combinepath(keydir, seckeyfile);
767
if (seckeyfile == NULL){
768
perror("combinepath");
769
goto end;
982
770
}
983
771
984
772
if_index = (AvahiIfIndex) if_nametoindex(interface);
993
781
char *address = strrchr(connect_to, ':');
994
782
if(address == NULL){
995
783
fprintf(stderr, "No colon in address\n");
996
exitcode = EXIT_FAILURE;
997
goto end;
784
exit(EXIT_FAILURE);
998
785
}
999
786
errno = 0;
1000
787
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1001
788
if(errno){
1002
789
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
1004
goto end;
790
exit(EXIT_FAILURE);
1005
791
}
1006
792
*address = '\0';
1007
793
address = connect_to;
1008
794
ret = start_mandos_communication(address, port, if_index, &mc);
1009
795
if(ret < 0){
1010
exitcode = EXIT_FAILURE;
796
exit(EXIT_FAILURE);
1011
797
} else {
1012
exitcode = EXIT_SUCCESS;
1013
}
1014
goto end;
798
exit(EXIT_SUCCESS);
799
}
800
}
801
802
/* If the interface is down, bring it up */
803
{
804
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
805
if(sd < 0) {
806
perror("socket");
807
exitcode = EXIT_FAILURE;
808
goto end;
809
}
810
strcpy(network.ifr_name, interface); /* Spurious warning */
811
ret = ioctl(sd, SIOCGIFFLAGS, &network);
812
if(ret == -1){
813
perror("ioctl SIOCGIFFLAGS");
814
exitcode = EXIT_FAILURE;
815
goto end;
816
}
817
if((network.ifr_flags & IFF_UP) == 0){
818
network.ifr_flags |= IFF_UP;
819
ret = ioctl(sd, SIOCSIFFLAGS, &network);
820
if(ret == -1){
821
perror("ioctl SIOCSIFFLAGS");
822
exitcode = EXIT_FAILURE;
823
goto end;
824
}
825
}
826
close(sd);
1015
827
}
1016
828
1017
829
if (not debug){
1029
841
exitcode = EXIT_FAILURE;
1030
842
goto end;
1031
843
}
1032
844
1033
845
{
1034
846
AvahiServerConfig config;
1035
847
/* Do not publish any local Zeroconf records */
1038
850
config.publish_addresses = 0;
1039
851
config.publish_workstation = 0;
1040
852
config.publish_domain = 0;
1041
853
1042
854
/* Allocate a new server */
1043
855
mc.server = avahi_server_new(avahi_simple_poll_get
1044
856
(mc.simple_poll), &config, NULL,
1045
857
NULL, &error);
1046
858
1047
859
/* Free the Avahi configuration data */
1048
860
avahi_server_config_free(&config);
1049
861
}
1069
881
}
1070
882
1071
883
/* Run the main loop */
1072
884
1073
885
if (debug){
1074
886
fprintf(stderr, "Starting Avahi loop search\n");
1075
887
}
1077
889
avahi_simple_poll_loop(mc.simple_poll);
1078
890
1079
891
end:
1080
892
1081
893
if (debug){
1082
894
fprintf(stderr, "%s exiting\n", argv[0]);
1083
895
}
1088
900
1089
901
if (mc.server != NULL)
1090
902
avahi_server_free(mc.server);
1091
903
1092
904
if (mc.simple_poll != NULL)
1093
905
avahi_simple_poll_free(mc.simple_poll);
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
906
free(pubkeyfile);
907
free(seckeyfile);
908
1142
909
return exitcode;
1143
910
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0