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:
- .bzrignore
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/password-request.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
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
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pupkey.txt"
76
static const char *keydir = "/conf/conf.d/mandos";
77
static const char *pubkeyfile = "pubkey.txt";
78
static const char *seckeyfile = "seckey.txt";
111
79
112
80
bool debug = false;
113
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "password-request 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
81
117
/* Used for passing in values through the Avahi callback functions */
82
/* Used for passing in values through all the callback functions */
118
83
typedef struct {
119
84
AvahiSimplePoll *simple_poll;
120
85
AvahiServer *server;
121
86
gnutls_certificate_credentials_t cred;
122
87
unsigned int dh_bits;
123
gnutls_dh_params_t dh_params;
124
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;
125
100
gpgme_ctx_t ctx;
126
} mandos_context;
127
128
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
131
* "buffer_length" is how much is already used.
132
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
138
return 0;
139
}
140
buffer_capacity += BUFFER_SIZE;
141
}
142
return buffer_capacity;
143
}
144
145
/*
146
* Initialize GPGME.
147
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
151
101
gpgme_error_t rc;
102
ssize_t ret;
103
size_t plaintext_capacity = 0;
104
ssize_t plaintext_length = 0;
152
105
gpgme_engine_info_t engine_info;
153
154
155
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
157
*/
158
bool import_key(const char *filename){
159
int fd;
160
gpgme_data_t pgp_data;
161
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
if(fd == -1){
164
perror("open");
165
return false;
166
}
167
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
183
if(ret == -1){
184
perror("close");
185
}
186
gpgme_data_release(pgp_data);
187
return true;
188
}
189
106
190
107
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
108
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
109
}
193
110
194
111
/* Init GPGME */
195
112
gpgme_check_version(NULL);
196
113
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
114
if (rc != GPG_ERR_NO_ERROR){
198
115
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
116
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
117
return -1;
201
118
}
202
203
/* Set GPGME home directory for the OpenPGP engine only */
119
120
/* Set GPGME home directory for the OpenPGP engine only */
204
121
rc = gpgme_get_engine_info (&engine_info);
205
122
if (rc != GPG_ERR_NO_ERROR){
206
123
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
124
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
125
return -1;
209
126
}
210
127
while(engine_info != NULL){
211
128
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
129
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
130
engine_info->file_name, homedir);
214
131
break;
215
132
}
216
133
engine_info = engine_info->next;
217
134
}
218
135
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
return false;
221
}
222
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
236
}
237
238
/*
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
241
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
246
gpgme_data_t dh_crypto, dh_plain;
247
gpgme_error_t rc;
248
ssize_t ret;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
251
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
136
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
137
return -1;
254
138
}
255
139
256
140
/* Create new GPGME data buffer from memory cryptotext */
271
155
return -1;
272
156
}
273
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
274
167
/* Decrypt data from the cryptotext data buffer to the plaintext
275
168
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
169
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
277
170
if (rc != GPG_ERR_NO_ERROR){
278
171
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
172
gpgme_strsource(rc), gpgme_strerror(rc));
280
173
plaintext_length = -1;
281
if (debug){
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
293
}
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
306
}
307
}
308
}
309
174
goto decrypt_end;
310
175
}
311
176
313
178
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
179
}
315
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
316
210
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
211
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
212
perror("pgpme_data_seek");
322
216
323
217
*plaintext = NULL;
324
218
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
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");
330
225
plaintext_length = -1;
331
226
goto decrypt_end;
227
}
228
plaintext_capacity += BUFFER_SIZE;
332
229
}
333
230
334
231
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
345
242
}
346
243
plaintext_length += ret;
347
244
}
348
245
349
246
if(debug){
350
247
fprintf(stderr, "Decrypted password is: ");
351
248
for(ssize_t i = 0; i < plaintext_length; i++){
365
262
}
366
263
367
264
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
265
const char *ret = gnutls_strerror (value);
369
266
if (ret == NULL)
370
267
ret = "(unknown)";
371
268
return ret;
377
274
fprintf(stderr, "GnuTLS: %s", string);
378
275
}
379
276
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
277
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
278
gnutls_dh_params_t *dh_params){
383
279
int ret;
384
280
385
281
if(debug){
386
282
fprintf(stderr, "Initializing GnuTLS\n");
387
283
}
388
389
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
284
285
if ((ret = gnutls_global_init ())
286
!= GNUTLS_E_SUCCESS) {
391
287
fprintf (stderr, "GnuTLS global_init: %s\n",
392
288
safer_gnutls_strerror(ret));
393
289
return -1;
402
298
}
403
299
404
300
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
301
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "GnuTLS memory error: %s\n",
409
304
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
411
305
return -1;
412
306
}
413
307
414
308
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
309
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
310
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
311
seckeyfile);
418
312
}
419
313
420
314
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
315
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
423
316
if (ret != GNUTLS_E_SUCCESS) {
424
317
fprintf(stderr,
425
318
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
319
" '%s')\n", ret, pubkeyfile, seckeyfile);
320
fprintf(stdout, "The GnuTLS error is: %s\n",
428
321
safer_gnutls_strerror(ret));
429
goto globalfail;
322
return -1;
430
323
}
431
324
432
325
/* GnuTLS server initialization */
433
ret = gnutls_dh_params_init(&mc->dh_params);
326
ret = gnutls_dh_params_init(dh_params);
434
327
if (ret != GNUTLS_E_SUCCESS) {
435
328
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
329
" %s\n", safer_gnutls_strerror(ret));
437
goto globalfail;
330
return -1;
438
331
}
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
332
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
440
333
if (ret != GNUTLS_E_SUCCESS) {
441
334
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
335
safer_gnutls_strerror(ret));
443
goto globalfail;
336
return -1;
444
337
}
445
338
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
447
448
return 0;
449
450
globalfail:
451
452
gnutls_certificate_free_credentials(mc->cred);
453
gnutls_global_deinit();
454
return -1;
455
}
456
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
459
int ret;
339
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
340
460
341
/* GnuTLS session creation */
461
342
ret = gnutls_init(session, GNUTLS_SERVER);
462
343
if (ret != GNUTLS_E_SUCCESS){
471
352
fprintf(stderr, "Syntax error at: %s\n", err);
472
353
fprintf(stderr, "GnuTLS error: %s\n",
473
354
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
475
355
return -1;
476
356
}
477
357
}
481
361
if (ret != GNUTLS_E_SUCCESS) {
482
362
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
363
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
485
364
return -1;
486
365
}
487
366
503
382
AvahiIfIndex if_index,
504
383
mandos_context *mc){
505
384
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
385
struct sockaddr_in6 to;
507
386
char *buffer = NULL;
508
387
char *decrypted_buffer;
509
388
size_t buffer_length = 0;
510
389
size_t buffer_capacity = 0;
511
390
ssize_t decrypted_buffer_size;
512
size_t written;
391
size_t written = 0;
513
392
int retval = 0;
514
393
char interface[IF_NAMESIZE];
515
394
gnutls_session_t session;
395
gnutls_dh_params_t dh_params;
516
396
517
ret = init_gnutls_session (mc, &session);
397
ret = initgnutls (mc, &session, &dh_params);
518
398
if (ret != 0){
519
399
return -1;
520
400
}
521
401
522
402
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
524
"\n", ip, port);
403
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
404
ip, port);
525
405
}
526
406
527
407
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
409
perror("socket");
530
410
return -1;
531
411
}
532
412
533
413
if(debug){
534
414
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
415
perror("if_indextoname");
538
418
fprintf(stderr, "Binding to interface %s\n", interface);
539
419
}
540
420
541
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
421
memset(&to,0,sizeof(to)); /* Spurious warning */
422
to.sin6_family = AF_INET6;
543
423
/* It would be nice to have a way to detect if we were passed an
544
424
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
425
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
546
426
if (ret < 0 ){
547
427
perror("inet_pton");
548
428
return -1;
551
431
fprintf(stderr, "Bad address: %s\n", ip);
552
432
return -1;
553
433
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
434
to.sin6_port = htons(port); /* Spurious warning */
555
435
556
to.in6.sin6_scope_id = (uint32_t)if_index;
436
to.sin6_scope_id = (uint32_t)if_index;
557
437
558
438
if(debug){
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
439
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
561
440
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
441
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
563
442
sizeof(addrstr)) == NULL){
564
443
perror("inet_ntop");
565
444
} else {
569
448
}
570
449
}
571
450
572
ret = connect(tcp_sd, &to.in, sizeof(to));
451
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
573
452
if (ret < 0){
574
453
perror("connect");
575
454
return -1;
576
455
}
577
456
578
const char *out = mandos_protocol_version;
579
written = 0;
580
while (true){
581
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
out_size - written));
584
if (ret == -1){
585
perror("write");
586
retval = -1;
587
goto mandos_end;
588
}
589
written += (size_t)ret;
590
if(written < out_size){
591
continue;
592
} else {
593
if (out == mandos_protocol_version){
594
written = 0;
595
out = "\r\n";
596
} else {
597
break;
598
}
599
}
600
}
601
602
457
if(debug){
603
458
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
459
}
605
460
606
461
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
462
608
do{
609
ret = gnutls_handshake (session);
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
463
ret = gnutls_handshake (session);
611
464
612
465
if (ret != GNUTLS_E_SUCCESS){
613
466
if(debug){
624
477
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
478
ip);
626
479
}
627
480
628
481
while(true){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
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;
635
490
}
636
491
637
492
ret = gnutls_record_recv(session, buffer+buffer_length,
645
500
case GNUTLS_E_AGAIN:
646
501
break;
647
502
case GNUTLS_E_REHANDSHAKE:
648
do{
649
ret = gnutls_handshake (session);
650
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
503
ret = gnutls_handshake (session);
651
504
if (ret < 0){
652
505
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
506
gnutls_perror (ret);
674
527
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
528
676
529
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
530
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
531
buffer_length,
679
&decrypted_buffer);
532
&decrypted_buffer,
533
keydir);
680
534
if (decrypted_buffer_size >= 0){
681
written = 0;
682
535
while(written < (size_t) decrypted_buffer_size){
683
536
ret = (int)fwrite (decrypted_buffer + written, 1,
684
537
(size_t)decrypted_buffer_size - written,
697
550
} else {
698
551
retval = -1;
699
552
}
700
} else {
701
retval = -1;
702
553
}
703
554
704
555
/* Shutdown procedure */
705
556
706
557
mandos_end:
707
558
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
711
}
559
close(tcp_sd);
712
560
gnutls_deinit (session);
561
gnutls_certificate_free_credentials (mc->cred);
562
gnutls_global_deinit ();
713
563
return retval;
714
564
}
715
565
728
578
flags,
729
579
void* userdata) {
730
580
mandos_context *mc = userdata;
731
assert(r);
581
assert(r); /* Spurious warning */
732
582
733
583
/* Called whenever a service has been resolved successfully or
734
584
timed out */
746
596
char ip[AVAHI_ADDRESS_STR_MAX];
747
597
avahi_address_snprint(ip, sizeof(ip), address);
748
598
if(debug){
749
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
599
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
600
" port %d\n", name, host_name, ip, interface, port);
752
601
}
753
602
int ret = start_mandos_communication(ip, port, interface, mc);
754
603
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
604
exit(EXIT_SUCCESS);
756
605
}
757
606
}
758
607
}
770
619
flags,
771
620
void* userdata) {
772
621
mandos_context *mc = userdata;
773
assert(b);
622
assert(b); /* Spurious warning */
774
623
775
624
/* Called whenever a new services becomes available on the LAN or
776
625
is removed from the LAN */
810
659
}
811
660
}
812
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
813
683
int main(int argc, char *argv[]){
814
684
AvahiSServiceBrowser *sb = NULL;
815
685
int error;
818
688
const char *interface = "eth0";
819
689
struct ifreq network;
820
690
int sd;
821
uid_t uid;
822
gid_t gid;
823
691
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
692
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
693
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
694
.dh_bits = 1024, .priority = "SECURE256"};
834
695
835
696
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
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':
889
738
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
739
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
891
740
if (errno){
892
741
perror("strtol");
893
742
exit(EXIT_FAILURE);
894
743
}
895
744
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
745
case 'P':
746
mc.priority = optarg;
747
break;
748
case '?':
903
749
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
ret = init_gnutls_global(&mc, pubkey, seckey);
922
if (ret == -1){
923
fprintf(stderr, "init_gnutls_global failed\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
} else {
927
gnutls_initalized = true;
928
}
929
930
if(mkdtemp(tempdir) == NULL){
931
perror("mkdtemp");
932
tempdir[0] = '\0';
933
goto end;
934
}
935
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
} else {
941
pgpme_initalized = true;
942
}
943
944
/* If the interface is down, bring it up */
945
{
946
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
947
if(sd < 0) {
948
perror("socket");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
strcpy(network.ifr_name, interface);
953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
if(ret == -1){
955
perror("ioctl SIOCGIFFLAGS");
956
exitcode = EXIT_FAILURE;
957
goto end;
958
}
959
if((network.ifr_flags & IFF_UP) == 0){
960
network.ifr_flags |= IFF_UP;
961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
if(ret == -1){
963
perror("ioctl SIOCSIFFLAGS");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
}
967
}
968
ret = TEMP_FAILURE_RETRY(close(sd));
969
if(ret == -1){
970
perror("close");
971
}
972
}
973
974
uid = getuid();
975
gid = getgid();
976
977
ret = setuid(uid);
978
if (ret == -1){
979
perror("setuid");
980
}
981
982
setgid(gid);
983
if (ret == -1){
984
perror("setgid");
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;
985
770
}
986
771
987
772
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
781
char *address = strrchr(connect_to, ':');
997
782
if(address == NULL){
998
783
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
784
exit(EXIT_FAILURE);
1001
785
}
1002
786
errno = 0;
1003
787
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
788
if(errno){
1005
789
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
1007
goto end;
790
exit(EXIT_FAILURE);
1008
791
}
1009
792
*address = '\0';
1010
793
address = connect_to;
1011
794
ret = start_mandos_communication(address, port, if_index, &mc);
1012
795
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
796
exit(EXIT_FAILURE);
1014
797
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
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);
1018
827
}
1019
828
1020
829
if (not debug){
1032
841
exitcode = EXIT_FAILURE;
1033
842
goto end;
1034
843
}
1035
844
1036
845
{
1037
846
AvahiServerConfig config;
1038
847
/* Do not publish any local Zeroconf records */
1041
850
config.publish_addresses = 0;
1042
851
config.publish_workstation = 0;
1043
852
config.publish_domain = 0;
1044
853
1045
854
/* Allocate a new server */
1046
855
mc.server = avahi_server_new(avahi_simple_poll_get
1047
856
(mc.simple_poll), &config, NULL,
1048
857
NULL, &error);
1049
858
1050
859
/* Free the Avahi configuration data */
1051
860
avahi_server_config_free(&config);
1052
861
}
1072
881
}
1073
882
1074
883
/* Run the main loop */
1075
884
1076
885
if (debug){
1077
886
fprintf(stderr, "Starting Avahi loop search\n");
1078
887
}
1080
889
avahi_simple_poll_loop(mc.simple_poll);
1081
890
1082
891
end:
1083
892
1084
893
if (debug){
1085
894
fprintf(stderr, "%s exiting\n", argv[0]);
1086
895
}
1091
900
1092
901
if (mc.server != NULL)
1093
902
avahi_server_free(mc.server);
1094
903
1095
904
if (mc.simple_poll != NULL)
1096
905
avahi_simple_poll_free(mc.simple_poll);
906
free(pubkeyfile);
907
free(seckeyfile);
1097
908
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_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
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
909
return exitcode;
1144
910
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0