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 24.1.13
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.13
- Committer: Björn Påhlsson
- Date: 2008-08-03 20:35:01 UTC
- 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-20080803203501-av7janz21ve7iq0b
mandosclient
Droping privileges
split gnutls function into global and session
* server.py (if_nametoindex): Redefine itself instead of using a
default keyword argument.
Droping privileges
split gnutls function into global and session
* server.py (if_nametoindex): Redefine itself instead of using a
default keyword argument.
- 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() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
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() */
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 */
61
44
#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 */
45
SIOCSIFFLAGS */
74
46
75
/* Avahi */
76
/* All Avahi types, constants and functions
77
Avahi*, avahi_*,
78
AVAHI_* */
79
47
#include <avahi-core/core.h>
80
48
#include <avahi-core/lookup.h>
81
49
#include <avahi-core/log.h>
83
51
#include <avahi-common/malloc.h>
84
52
#include <avahi-common/error.h>
85
53
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 */
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 */
94
68
95
69
/* GPGME */
96
#include <gpgme.h> /* All GPGME types, constants and
97
functions:
98
gpgme_*
99
GPGME_PROTOCOL_OpenPGP,
100
GPG_ERR_NO_* */
70
#include <errno.h> /* perror() */
71
#include <gpgme.h>
72
73
/* getopt_long */
74
#include <getopt.h>
101
75
102
76
#define BUFFER_SIZE 256
103
77
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"
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
111
81
112
82
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
117
/* 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 */
118
87
typedef struct {
119
88
AvahiSimplePoll *simple_poll;
120
89
AvahiServer *server;
122
91
unsigned int dh_bits;
123
92
gnutls_dh_params_t dh_params;
124
93
const char *priority;
125
gpgme_ctx_t ctx;
126
94
} mandos_context;
127
95
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
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
97
size_t buffer_capacity){
135
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
143
106
}
144
107
145
108
/*
146
* Initialize GPGME.
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
147
111
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
116
gpgme_data_t dh_crypto, dh_plain;
117
gpgme_ctx_t ctx;
151
118
gpgme_error_t rc;
119
ssize_t ret;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
152
122
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
123
190
124
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
126
}
193
127
194
128
/* Init GPGME */
195
129
gpgme_check_version(NULL);
196
130
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
131
if (rc != GPG_ERR_NO_ERROR){
198
132
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
133
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
134
return -1;
201
135
}
202
203
/* Set GPGME home directory for the OpenPGP engine only */
136
137
/* Set GPGME home directory for the OpenPGP engine only */
204
138
rc = gpgme_get_engine_info (&engine_info);
205
139
if (rc != GPG_ERR_NO_ERROR){
206
140
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
141
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
142
return -1;
209
143
}
210
144
while(engine_info != NULL){
211
145
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
146
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
147
engine_info->file_name, homedir);
214
148
break;
215
149
}
216
150
engine_info = engine_info->next;
217
151
}
218
152
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");
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
154
return -1;
254
155
}
255
156
256
157
/* Create new GPGME data buffer from memory cryptotext */
271
172
return -1;
272
173
}
273
174
175
/* Create new GPGME "context" */
176
rc = gpgme_new(&ctx);
177
if (rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
plaintext_length = -1;
181
goto decrypt_end;
182
}
183
274
184
/* Decrypt data from the cryptotext data buffer to the plaintext
275
185
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
277
187
if (rc != GPG_ERR_NO_ERROR){
278
188
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
189
gpgme_strsource(rc), gpgme_strerror(rc));
280
190
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
191
goto decrypt_end;
310
192
}
311
193
313
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
196
}
315
197
198
if (debug){
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
201
if (result == NULL){
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
} else {
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
210
}
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
213
if(recipient){
214
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
219
recipient->status == GPG_ERR_NO_SECKEY
220
? "No" : "Yes");
221
recipient = recipient->next;
222
}
223
}
224
}
225
}
226
316
227
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
229
perror("pgpme_data_seek");
322
233
323
234
*plaintext = NULL;
324
235
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
236
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
327
237
plaintext_capacity);
328
238
if (plaintext_capacity == 0){
329
239
perror("adjustbuffer");
345
255
}
346
256
plaintext_length += ret;
347
257
}
348
258
349
259
if(debug){
350
260
fprintf(stderr, "Decrypted password is: ");
351
261
for(ssize_t i = 0; i < plaintext_length; i++){
365
275
}
366
276
367
277
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
278
const char *ret = gnutls_strerror (value);
369
279
if (ret == NULL)
370
280
ret = "(unknown)";
371
281
return ret;
377
287
fprintf(stderr, "GnuTLS: %s", string);
378
288
}
379
289
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
290
static int init_gnutls_global(mandos_context *mc){
383
291
int ret;
384
292
385
293
if(debug){
386
294
fprintf(stderr, "Initializing GnuTLS\n");
387
295
}
388
389
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
296
297
if ((ret = gnutls_global_init ())
298
!= GNUTLS_E_SUCCESS) {
391
299
fprintf (stderr, "GnuTLS global_init: %s\n",
392
300
safer_gnutls_strerror(ret));
393
301
return -1;
402
310
}
403
311
404
312
/* 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 */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
314
!= GNUTLS_E_SUCCESS) {
315
fprintf (stderr, "GnuTLS memory error: %s\n",
409
316
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
411
317
return -1;
412
318
}
413
319
414
320
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
418
324
}
419
325
420
326
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
423
328
if (ret != GNUTLS_E_SUCCESS) {
424
329
fprintf(stderr,
425
330
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
428
333
safer_gnutls_strerror(ret));
429
goto globalfail;
334
return -1;
430
335
}
431
336
432
337
/* GnuTLS server initialization */
434
339
if (ret != GNUTLS_E_SUCCESS) {
435
340
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
341
" %s\n", safer_gnutls_strerror(ret));
437
goto globalfail;
342
return -1;
438
343
}
439
344
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
345
if (ret != GNUTLS_E_SUCCESS) {
441
346
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
347
safer_gnutls_strerror(ret));
443
goto globalfail;
348
return -1;
444
349
}
445
350
446
351
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
447
352
448
353
return 0;
449
450
globalfail:
451
452
gnutls_certificate_free_credentials(mc->cred);
453
gnutls_global_deinit();
454
return -1;
455
354
}
456
355
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
356
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
459
357
int ret;
460
358
/* GnuTLS session creation */
461
359
ret = gnutls_init(session, GNUTLS_SERVER);
471
369
fprintf(stderr, "Syntax error at: %s\n", err);
472
370
fprintf(stderr, "GnuTLS error: %s\n",
473
371
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
475
372
return -1;
476
373
}
477
374
}
481
378
if (ret != GNUTLS_E_SUCCESS) {
482
379
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
380
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
485
381
return -1;
486
382
}
487
383
503
399
AvahiIfIndex if_index,
504
400
mandos_context *mc){
505
401
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
402
struct sockaddr_in6 to;
507
403
char *buffer = NULL;
508
404
char *decrypted_buffer;
509
405
size_t buffer_length = 0;
513
409
int retval = 0;
514
410
char interface[IF_NAMESIZE];
515
411
gnutls_session_t session;
412
gnutls_dh_params_t dh_params;
516
413
517
414
ret = init_gnutls_session (mc, &session);
518
415
if (ret != 0){
520
417
}
521
418
522
419
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
524
"\n", ip, port);
420
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
421
ip, port);
525
422
}
526
423
527
424
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
426
perror("socket");
530
427
return -1;
531
428
}
532
429
533
430
if(debug){
534
431
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
432
perror("if_indextoname");
538
435
fprintf(stderr, "Binding to interface %s\n", interface);
539
436
}
540
437
541
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
438
memset(&to,0,sizeof(to)); /* Spurious warning */
439
to.sin6_family = AF_INET6;
543
440
/* It would be nice to have a way to detect if we were passed an
544
441
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
442
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
546
443
if (ret < 0 ){
547
444
perror("inet_pton");
548
445
return -1;
551
448
fprintf(stderr, "Bad address: %s\n", ip);
552
449
return -1;
553
450
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
451
to.sin6_port = htons(port); /* Spurious warning */
555
452
556
to.in6.sin6_scope_id = (uint32_t)if_index;
453
to.sin6_scope_id = (uint32_t)if_index;
557
454
558
455
if(debug){
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
456
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
561
457
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
458
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
563
459
sizeof(addrstr)) == NULL){
564
460
perror("inet_ntop");
565
461
} else {
569
465
}
570
466
}
571
467
572
ret = connect(tcp_sd, &to.in, sizeof(to));
468
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
573
469
if (ret < 0){
574
470
perror("connect");
575
471
return -1;
576
472
}
577
473
578
474
const char *out = mandos_protocol_version;
579
475
written = 0;
580
476
while (true){
598
494
}
599
495
}
600
496
}
601
497
602
498
if(debug){
603
499
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
500
}
605
501
606
502
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
503
608
do{
609
ret = gnutls_handshake (session);
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
504
ret = gnutls_handshake (session);
611
505
612
506
if (ret != GNUTLS_E_SUCCESS){
613
507
if(debug){
624
518
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
519
ip);
626
520
}
627
521
628
522
while(true){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
buffer_capacity);
523
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
631
524
if (buffer_capacity == 0){
632
525
perror("adjustbuffer");
633
526
retval = -1;
645
538
case GNUTLS_E_AGAIN:
646
539
break;
647
540
case GNUTLS_E_REHANDSHAKE:
648
do{
649
ret = gnutls_handshake (session);
650
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
541
ret = gnutls_handshake (session);
651
542
if (ret < 0){
652
543
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
544
gnutls_perror (ret);
674
565
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
566
676
567
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
568
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
569
buffer_length,
679
&decrypted_buffer);
570
&decrypted_buffer,
571
keydir);
680
572
if (decrypted_buffer_size >= 0){
681
573
written = 0;
682
574
while(written < (size_t) decrypted_buffer_size){
697
589
} else {
698
590
retval = -1;
699
591
}
700
} else {
701
retval = -1;
702
592
}
703
593
704
594
/* Shutdown procedure */
705
595
706
596
mandos_end:
707
597
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
711
}
598
close(tcp_sd);
712
599
gnutls_deinit (session);
600
gnutls_certificate_free_credentials (mc->cred);
601
gnutls_global_deinit ();
713
602
return retval;
714
603
}
715
604
728
617
flags,
729
618
void* userdata) {
730
619
mandos_context *mc = userdata;
731
assert(r);
620
assert(r); /* Spurious warning */
732
621
733
622
/* Called whenever a service has been resolved successfully or
734
623
timed out */
746
635
char ip[AVAHI_ADDRESS_STR_MAX];
747
636
avahi_address_snprint(ip, sizeof(ip), address);
748
637
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);
638
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
639
" port %d\n", name, host_name, ip, interface, port);
752
640
}
753
641
int ret = start_mandos_communication(ip, port, interface, mc);
754
642
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
643
exit(EXIT_SUCCESS);
756
644
}
757
645
}
758
646
}
770
658
flags,
771
659
void* userdata) {
772
660
mandos_context *mc = userdata;
773
assert(b);
661
assert(b); /* Spurious warning */
774
662
775
663
/* Called whenever a new services becomes available on the LAN or
776
664
is removed from the LAN */
810
698
}
811
699
}
812
700
701
/* Combines file name and path and returns the malloced new
702
string. some sane checks could/should be added */
703
static const char *combinepath(const char *first, const char *second){
704
size_t f_len = strlen(first);
705
size_t s_len = strlen(second);
706
char *tmp = malloc(f_len + s_len + 2);
707
if (tmp == NULL){
708
return NULL;
709
}
710
if(f_len > 0){
711
memcpy(tmp, first, f_len); /* Spurious warning */
712
}
713
tmp[f_len] = '/';
714
if(s_len > 0){
715
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
716
}
717
tmp[f_len + 1 + s_len] = '\0';
718
return tmp;
719
}
720
721
813
722
int main(int argc, char *argv[]){
814
723
AvahiSServiceBrowser *sb = NULL;
815
724
int error;
821
730
uid_t uid;
822
731
gid_t gid;
823
732
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
733
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
734
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;
735
.dh_bits = 1024, .priority = "SECURE256"};
834
736
835
737
{
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 */
738
/* Temporary int to get the address of for getopt_long */
739
int debug_int = debug ? 1 : 0;
740
while (true){
741
struct option long_options[] = {
742
{"debug", no_argument, &debug_int, 1},
743
{"connect", required_argument, NULL, 'c'},
744
{"interface", required_argument, NULL, 'i'},
745
{"keydir", required_argument, NULL, 'd'},
746
{"seckey", required_argument, NULL, 's'},
747
{"pubkey", required_argument, NULL, 'p'},
748
{"dh-bits", required_argument, NULL, 'D'},
749
{"priority", required_argument, NULL, 'P'},
750
{0, 0, 0, 0} };
751
752
int option_index = 0;
753
ret = getopt_long (argc, argv, "i:", long_options,
754
&option_index);
755
756
if (ret == -1){
757
break;
758
}
759
760
switch(ret){
761
case 0:
762
break;
763
case 'i':
764
interface = optarg;
765
break;
766
case 'c':
767
connect_to = optarg;
768
break;
769
case 'd':
770
keydir = optarg;
771
break;
772
case 'p':
773
pubkeyfile = optarg;
774
break;
775
case 's':
776
seckeyfile = optarg;
777
break;
778
case 'D':
889
779
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
780
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
891
781
if (errno){
892
782
perror("strtol");
893
783
exit(EXIT_FAILURE);
894
784
}
895
785
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;
786
case 'P':
787
mc.priority = optarg;
788
break;
789
case '?':
903
790
default:
904
return ARGP_ERR_UNKNOWN;
791
/* getopt_long() has already printed a message about the
792
unrcognized option, so just exit. */
793
exit(EXIT_FAILURE);
905
794
}
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);
795
}
796
/* Set the global debug flag from the temporary int */
797
debug = debug_int ? true : false;
798
}
799
800
pubkeyfile = combinepath(keydir, pubkeyfile);
801
if (pubkeyfile == NULL){
802
perror("combinepath");
803
exitcode = EXIT_FAILURE;
804
goto end;
805
}
806
807
seckeyfile = combinepath(keydir, seckeyfile);
808
if (seckeyfile == NULL){
809
perror("combinepath");
810
goto end;
811
}
812
813
ret = init_gnutls_global(&mc);
922
814
if (ret == -1){
923
fprintf(stderr, "init_gnutls_global failed\n");
924
exitcode = EXIT_FAILURE;
815
fprintf(stderr, "init_gnutls_global\n");
925
816
goto end;
926
} else {
927
gnutls_initalized = true;
928
817
}
929
818
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
819
uid = getuid();
975
820
gid = getgid();
976
821
977
822
ret = setuid(uid);
978
823
if (ret == -1){
979
824
perror("setuid");
1017
862
goto end;
1018
863
}
1019
864
865
/* If the interface is down, bring it up */
866
{
867
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
868
if(sd < 0) {
869
perror("socket");
870
exitcode = EXIT_FAILURE;
871
goto end;
872
}
873
strcpy(network.ifr_name, interface); /* Spurious warning */
874
ret = ioctl(sd, SIOCGIFFLAGS, &network);
875
if(ret == -1){
876
perror("ioctl SIOCGIFFLAGS");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
if((network.ifr_flags & IFF_UP) == 0){
881
network.ifr_flags |= IFF_UP;
882
ret = ioctl(sd, SIOCSIFFLAGS, &network);
883
if(ret == -1){
884
perror("ioctl SIOCSIFFLAGS");
885
exitcode = EXIT_FAILURE;
886
goto end;
887
}
888
}
889
close(sd);
890
}
891
1020
892
if (not debug){
1021
893
avahi_set_log_function(empty_log);
1022
894
}
1032
904
exitcode = EXIT_FAILURE;
1033
905
goto end;
1034
906
}
1035
907
1036
908
{
1037
909
AvahiServerConfig config;
1038
910
/* Do not publish any local Zeroconf records */
1041
913
config.publish_addresses = 0;
1042
914
config.publish_workstation = 0;
1043
915
config.publish_domain = 0;
1044
916
1045
917
/* Allocate a new server */
1046
918
mc.server = avahi_server_new(avahi_simple_poll_get
1047
919
(mc.simple_poll), &config, NULL,
1048
920
NULL, &error);
1049
921
1050
922
/* Free the Avahi configuration data */
1051
923
avahi_server_config_free(&config);
1052
924
}
1072
944
}
1073
945
1074
946
/* Run the main loop */
1075
947
1076
948
if (debug){
1077
949
fprintf(stderr, "Starting Avahi loop search\n");
1078
950
}
1080
952
avahi_simple_poll_loop(mc.simple_poll);
1081
953
1082
954
end:
1083
955
1084
956
if (debug){
1085
957
fprintf(stderr, "%s exiting\n", argv[0]);
1086
958
}
1091
963
1092
964
if (mc.server != NULL)
1093
965
avahi_server_free(mc.server);
1094
966
1095
967
if (mc.simple_poll != NULL)
1096
968
avahi_simple_poll_free(mc.simple_poll);
969
free(pubkeyfile);
970
free(seckeyfile);
1097
971
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
972
return exitcode;
1144
973
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0