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/mandos-client.c
- browse files at revision 275
- compare with another revision
- download diff
- download tarball
- view history from revision 275
- Committer: Teddy Hogeborn
- Date: 2009-01-18 00:16:57 UTC
- Revision ID: teddy@fukt.bsnet.se-20090118001657-6mo3ae73ldy5tegf
* debian/mandos-client.postinst: Converted to Bourne shell. Also
minor message change.
* debian/mandos-client.postrm: Minor message change.
* debian/mandos.postinst: Converted to Bourne shell. Also minor
message change.
* debian/mandos.prerm: Minor message change.
minor message change.
* debian/mandos-client.postrm: Minor message change.
* debian/mandos.postinst: Converted to Bourne shell. Also minor
message change.
* debian/mandos.prerm: Minor message change.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
39
40
#include <stdint.h> /* uint16_t, uint32_t */
40
41
#include <stddef.h> /* NULL, size_t, ssize_t */
41
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
43
srand() */
43
44
#include <stdbool.h> /* bool, true */
44
45
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
46
strerror(), asprintf(), strcpy() */
46
47
#include <sys/ioctl.h> /* ioctl */
47
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
49
sockaddr_in6, PF_INET6,
49
50
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
52
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
55
struct in6_addr, inet_pton(),
54
56
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
55
61
#include <assert.h> /* assert() */
56
62
#include <errno.h> /* perror(), errno */
57
63
#include <time.h> /* time() */
58
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
65
SIOCSIFFLAGS, if_indextoname(),
60
66
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
61
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
69
getuid(), getgid(), setuid(),
63
70
setgid() */
64
#include <netinet/in.h>
65
71
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
72
#include <iso646.h> /* not, and, or */
67
73
#include <argp.h> /* struct argp_option, error_t, struct
68
74
argp_state, struct argp,
69
75
argp_parse(), ARGP_KEY_ARG,
81
87
#include <avahi-common/error.h>
82
88
83
89
/* GnuTLS */
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
90
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
functions:
85
92
gnutls_*
86
93
init_gnutls_session(),
87
94
GNUTLS_* */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
89
97
GNUTLS_OPENPGP_FMT_BASE64 */
90
98
91
99
/* GPGME */
92
#include <gpgme.h> /* All GPGME types, constants and functions
100
#include <gpgme.h> /* All GPGME types, constants and
101
functions:
93
102
gpgme_*
94
103
GPGME_PROTOCOL_OpenPGP,
95
104
GPG_ERR_NO_* */
96
105
97
106
#define BUFFER_SIZE 256
98
107
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
99
112
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
101
113
static const char mandos_protocol_version[] = "1";
102
const char *argp_program_version = "password-request 1.0";
114
const char *argp_program_version = "mandos-client " VERSION;
103
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
104
116
105
117
/* Used for passing in values through the Avahi callback functions */
110
122
unsigned int dh_bits;
111
123
gnutls_dh_params_t dh_params;
112
124
const char *priority;
125
gpgme_ctx_t ctx;
113
126
} mandos_context;
114
127
115
128
/*
119
132
*/
120
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
121
134
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
124
if (buffer == NULL){
137
if(buffer == NULL){
125
138
return 0;
126
139
}
127
140
buffer_capacity += BUFFER_SIZE;
130
143
}
131
144
132
145
/*
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
146
* Initialize GPGME.
135
147
*/
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
142
151
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
146
152
gpgme_engine_info_t engine_info;
147
153
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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 = (int)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 = (int)TEMP_FAILURE_RETRY(close(fd));
183
if(ret == -1){
184
perror("close");
185
}
186
gpgme_data_release(pgp_data);
187
return true;
188
}
189
190
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
150
192
}
151
193
152
194
/* Init GPGME */
153
195
gpgme_check_version(NULL);
154
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
155
if (rc != GPG_ERR_NO_ERROR){
197
if(rc != GPG_ERR_NO_ERROR){
156
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
157
199
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
200
return false;
159
201
}
160
202
161
/* Set GPGME home directory for the OpenPGP engine only */
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info(&engine_info);
205
if(rc != GPG_ERR_NO_ERROR){
164
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
165
207
gpgme_strsource(rc), gpgme_strerror(rc));
166
return -1;
208
return false;
167
209
}
168
210
while(engine_info != NULL){
169
211
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
170
212
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
171
engine_info->file_name, homedir);
213
engine_info->file_name, tempdir);
172
214
break;
173
215
}
174
216
engine_info = engine_info->next;
175
217
}
176
218
if(engine_info == NULL){
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
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");
179
254
}
180
255
181
256
/* Create new GPGME data buffer from memory cryptotext */
182
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
183
258
0);
184
if (rc != GPG_ERR_NO_ERROR){
259
if(rc != GPG_ERR_NO_ERROR){
185
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
186
261
gpgme_strsource(rc), gpgme_strerror(rc));
187
262
return -1;
189
264
190
265
/* Create new empty GPGME data buffer for the plaintext */
191
266
rc = gpgme_data_new(&dh_plain);
192
if (rc != GPG_ERR_NO_ERROR){
267
if(rc != GPG_ERR_NO_ERROR){
193
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
194
269
gpgme_strsource(rc), gpgme_strerror(rc));
195
270
gpgme_data_release(dh_crypto);
196
271
return -1;
197
272
}
198
273
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
208
274
/* Decrypt data from the cryptotext data buffer to the plaintext
209
275
data buffer */
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
212
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
213
279
gpgme_strsource(rc), gpgme_strerror(rc));
214
280
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
}
215
309
goto decrypt_end;
216
310
}
217
311
219
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
314
}
221
315
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
if(recipient){
238
while(recipient != NULL){
239
fprintf(stderr, "Public key algorithm: %s\n",
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
241
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
242
fprintf(stderr, "Secret key available: %s\n",
243
recipient->status == GPG_ERR_NO_SECKEY
244
? "No" : "Yes");
245
recipient = recipient->next;
246
}
247
}
248
}
249
}
250
251
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
254
319
plaintext_length = -1;
255
320
goto decrypt_end;
256
321
}
260
325
plaintext_capacity = adjustbuffer(plaintext,
261
326
(size_t)plaintext_length,
262
327
plaintext_capacity);
263
if (plaintext_capacity == 0){
328
if(plaintext_capacity == 0){
264
329
perror("adjustbuffer");
265
330
plaintext_length = -1;
266
331
goto decrypt_end;
269
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
270
335
BUFFER_SIZE);
271
336
/* Print the data, if any */
272
if (ret == 0){
337
if(ret == 0){
273
338
/* EOF */
274
339
break;
275
340
}
280
345
}
281
346
plaintext_length += ret;
282
347
}
283
348
284
349
if(debug){
285
350
fprintf(stderr, "Decrypted password is: ");
286
351
for(ssize_t i = 0; i < plaintext_length; i++){
299
364
return plaintext_length;
300
365
}
301
366
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
-Wunreachable-code */
370
if(ret == NULL)
305
371
ret = "(unknown)";
306
372
return ret;
307
373
}
313
379
}
314
380
315
381
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
382
const char *pubkeyfilename,
383
const char *seckeyfilename){
318
384
int ret;
319
385
320
386
if(debug){
322
388
}
323
389
324
390
ret = gnutls_global_init();
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
328
394
return -1;
329
395
}
330
396
331
if (debug){
397
if(debug){
332
398
/* "Use a log level over 10 to enable all debugging options."
333
399
* - GnuTLS manual
334
400
*/
338
404
339
405
/* OpenPGP credentials */
340
406
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
407
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
412
safer_gnutls_strerror(ret));
413
gnutls_global_deinit();
345
414
return -1;
346
415
}
347
416
348
417
if(debug){
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
420
seckeyfilename);
352
421
}
353
422
354
423
ret = gnutls_certificate_set_openpgp_key_file
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
424
(mc->cred, pubkeyfilename, seckeyfilename,
425
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
357
427
fprintf(stderr,
358
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
361
431
safer_gnutls_strerror(ret));
362
432
goto globalfail;
363
433
}
364
434
365
435
/* GnuTLS server initialization */
366
436
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
370
440
goto globalfail;
371
441
}
372
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
376
446
goto globalfail;
377
447
}
378
448
379
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
450
381
451
return 0;
382
452
383
453
globalfail:
384
454
385
455
gnutls_certificate_free_credentials(mc->cred);
386
456
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
387
458
return -1;
388
389
459
}
390
460
391
461
static int init_gnutls_session(mandos_context *mc,
393
463
int ret;
394
464
/* GnuTLS session creation */
395
465
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
466
if(ret != GNUTLS_E_SUCCESS){
397
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
398
468
safer_gnutls_strerror(ret));
399
469
}
401
471
{
402
472
const char *err;
403
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
474
if(ret != GNUTLS_E_SUCCESS) {
405
475
fprintf(stderr, "Syntax error at: %s\n", err);
406
476
fprintf(stderr, "GnuTLS error: %s\n",
407
477
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
478
gnutls_deinit(*session);
409
479
return -1;
410
480
}
411
481
}
412
482
413
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
484
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
485
if(ret != GNUTLS_E_SUCCESS) {
416
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
417
487
safer_gnutls_strerror(ret));
418
gnutls_deinit (*session);
488
gnutls_deinit(*session);
419
489
return -1;
420
490
}
421
491
422
492
/* ignore client certificate if any. */
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
425
495
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
427
497
428
498
return 0;
429
499
}
437
507
AvahiIfIndex if_index,
438
508
mandos_context *mc){
439
509
int ret, tcp_sd;
510
ssize_t sret;
440
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
441
512
char *buffer = NULL;
442
513
char *decrypted_buffer;
448
519
char interface[IF_NAMESIZE];
449
520
gnutls_session_t session;
450
521
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
453
524
return -1;
454
525
}
455
526
463
534
perror("socket");
464
535
return -1;
465
536
}
466
537
467
538
if(debug){
468
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
540
perror("if_indextoname");
472
543
fprintf(stderr, "Binding to interface %s\n", interface);
473
544
}
474
545
475
memset(&to,0,sizeof(to)); /* Spurious warning */
546
memset(&to, 0, sizeof(to));
476
547
to.in6.sin6_family = AF_INET6;
477
548
/* It would be nice to have a way to detect if we were passed an
478
549
IPv4 address here. Now we assume an IPv6 address. */
479
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
if (ret < 0 ){
551
if(ret < 0 ){
481
552
perror("inet_pton");
482
553
return -1;
483
554
}
485
556
fprintf(stderr, "Bad address: %s\n", ip);
486
557
return -1;
487
558
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
489
562
490
563
to.in6.sin6_scope_id = (uint32_t)if_index;
491
564
504
577
}
505
578
506
579
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
580
if(ret < 0){
508
581
perror("connect");
509
582
return -1;
510
583
}
511
584
512
585
const char *out = mandos_protocol_version;
513
586
written = 0;
514
while (true){
587
while(true){
515
588
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
590
out_size - written));
518
if (ret == -1){
591
if(ret == -1){
519
592
perror("write");
520
593
retval = -1;
521
594
goto mandos_end;
524
597
if(written < out_size){
525
598
continue;
526
599
} else {
527
if (out == mandos_protocol_version){
600
if(out == mandos_protocol_version){
528
601
written = 0;
529
602
out = "\r\n";
530
603
} else {
532
605
}
533
606
}
534
607
}
535
608
536
609
if(debug){
537
610
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
611
}
539
612
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
542
615
do{
543
ret = gnutls_handshake (session);
616
ret = gnutls_handshake(session);
544
617
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
545
618
546
if (ret != GNUTLS_E_SUCCESS){
619
if(ret != GNUTLS_E_SUCCESS){
547
620
if(debug){
548
621
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
549
gnutls_perror (ret);
622
gnutls_perror(ret);
550
623
}
551
624
retval = -1;
552
625
goto mandos_end;
558
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
559
632
ip);
560
633
}
561
634
562
635
while(true){
563
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
564
637
buffer_capacity);
565
if (buffer_capacity == 0){
638
if(buffer_capacity == 0){
566
639
perror("adjustbuffer");
567
640
retval = -1;
568
641
goto mandos_end;
569
642
}
570
643
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
574
647
break;
575
648
}
576
if (ret < 0){
577
switch(ret){
649
if(sret < 0){
650
switch(sret){
578
651
case GNUTLS_E_INTERRUPTED:
579
652
case GNUTLS_E_AGAIN:
580
653
break;
581
654
case GNUTLS_E_REHANDSHAKE:
582
655
do{
583
ret = gnutls_handshake (session);
656
ret = gnutls_handshake(session);
584
657
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
585
if (ret < 0){
658
if(ret < 0){
586
659
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
587
gnutls_perror (ret);
660
gnutls_perror(ret);
588
661
retval = -1;
589
662
goto mandos_end;
590
663
}
593
666
fprintf(stderr, "Unknown error while reading data from"
594
667
" encrypted session with Mandos server\n");
595
668
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
597
670
goto mandos_end;
598
671
}
599
672
} else {
600
buffer_length += (size_t) ret;
673
buffer_length += (size_t) sret;
601
674
}
602
675
}
603
676
605
678
fprintf(stderr, "Closing TLS session\n");
606
679
}
607
680
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
609
682
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
612
685
buffer_length,
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
616
688
written = 0;
617
689
while(written < (size_t) decrypted_buffer_size){
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
621
693
if(ret == 0 and ferror(stdout)){
622
694
if(debug){
623
695
fprintf(stderr, "Error writing encrypted data: %s\n",
632
704
} else {
633
705
retval = -1;
634
706
}
707
} else {
708
retval = -1;
635
709
}
636
710
637
711
/* Shutdown procedure */
638
712
639
713
mandos_end:
640
714
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
643
720
return retval;
644
721
}
645
722
658
735
flags,
659
736
void* userdata) {
660
737
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
738
assert(r);
662
739
663
740
/* Called whenever a service has been resolved successfully or
664
741
timed out */
665
742
666
switch (event) {
743
switch(event) {
667
744
default:
668
745
case AVAHI_RESOLVER_FAILURE:
669
746
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
677
754
avahi_address_snprint(ip, sizeof(ip), address);
678
755
if(debug){
679
756
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
682
759
}
683
760
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
761
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
686
763
}
687
764
}
688
765
}
700
777
flags,
701
778
void* userdata) {
702
779
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
780
assert(b);
704
781
705
782
/* Called whenever a new services becomes available on the LAN or
706
783
is removed from the LAN */
707
784
708
switch (event) {
785
switch(event) {
709
786
default:
710
787
case AVAHI_BROWSER_FAILURE:
711
788
720
797
the callback function is called the Avahi server will free the
721
798
resolver for us. */
722
799
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
724
801
protocol, name, type, domain,
725
802
AVAHI_PROTO_INET6, 0,
726
803
resolve_callback, mc)))
740
817
}
741
818
}
742
819
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
return tmp;
761
}
762
763
764
820
int main(int argc, char *argv[]){
765
821
AvahiSServiceBrowser *sb = NULL;
766
822
int error;
767
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
768
826
int exitcode = EXIT_SUCCESS;
769
827
const char *interface = "eth0";
770
828
struct ifreq network;
772
830
uid_t uid;
773
831
gid_t gid;
774
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
775
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
778
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
780
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
781
843
782
844
{
783
845
struct argp_option options[] = {
784
846
{ .name = "debug", .key = 128,
785
847
.doc = "Debug mode", .group = 3 },
786
848
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
789
851
.group = 1 },
790
852
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
797
856
.group = 1 },
798
857
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
801
860
.group = 1 },
802
861
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
805
864
.group = 2 },
806
865
{ .name = "dh-bits", .key = 129,
807
866
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
809
869
.group = 2 },
810
870
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
813
874
{ .name = NULL }
814
875
};
815
816
876
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
823
881
debug = true;
824
882
break;
825
case 'c':
883
case 'c': /* --connect */
826
884
connect_to = arg;
827
885
break;
828
case 'i':
886
case 'i': /* --interface */
829
887
interface = arg;
830
888
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
845
900
exit(EXIT_FAILURE);
846
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
847
903
break;
848
case 130:
904
case 130: /* --priority */
849
905
mc.priority = arg;
850
906
break;
851
907
case ARGP_KEY_ARG:
852
argp_usage (state);
908
argp_usage(state);
909
case ARGP_KEY_END:
853
910
break;
854
case ARGP_KEY_END:
855
break;
856
911
default:
857
912
return ARGP_ERR_UNKNOWN;
858
913
}
859
914
return 0;
860
915
}
861
916
862
917
struct argp argp = { .options = options, .parser = parse_opt,
863
918
.args_doc = "",
864
919
.doc = "Mandos client -- Get and decrypt"
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
868
923
fprintf(stderr, "Unknown error while parsing arguments\n");
869
924
exitcode = EXIT_FAILURE;
870
925
goto end;
871
926
}
872
927
}
873
874
pubkeyfile = combinepath(keydir, pubkeyfile);
875
if (pubkeyfile == NULL){
876
perror("combinepath");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
881
seckeyfile = combinepath(keydir, seckeyfile);
882
if (seckeyfile == NULL){
883
perror("combinepath");
884
exitcode = EXIT_FAILURE;
885
goto end;
886
}
887
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
if (ret == -1){
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
928
897
929
/* If the interface is down, bring it up */
898
930
{
902
934
exitcode = EXIT_FAILURE;
903
935
goto end;
904
936
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
937
strcpy(network.ifr_name, interface);
906
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
939
if(ret == -1){
908
940
perror("ioctl SIOCGIFFLAGS");
918
950
goto end;
919
951
}
920
952
}
921
close(sd);
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
922
957
}
923
958
924
959
uid = getuid();
925
960
gid = getgid();
926
961
927
962
ret = setuid(uid);
928
if (ret == -1){
963
if(ret == -1){
929
964
perror("setuid");
930
965
}
931
966
932
967
setgid(gid);
933
if (ret == -1){
968
if(ret == -1){
934
969
perror("setgid");
935
970
}
936
971
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initalized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
937
995
if_index = (AvahiIfIndex) if_nametoindex(interface);
938
996
if(if_index == 0){
939
997
fprintf(stderr, "No such interface: \"%s\"\n", interface);
949
1007
exitcode = EXIT_FAILURE;
950
1008
goto end;
951
1009
}
952
errno = 0;
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
perror("Bad port number");
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
956
1015
exitcode = EXIT_FAILURE;
957
1016
goto end;
958
1017
}
1018
port = (uint16_t)tmpmax;
959
1019
*address = '\0';
960
1020
address = connect_to;
961
1021
ret = start_mandos_communication(address, port, if_index, &mc);
967
1027
goto end;
968
1028
}
969
1029
970
if (not debug){
1030
if(not debug){
971
1031
avahi_set_log_function(empty_log);
972
1032
}
973
1033
976
1036
977
1037
/* Allocate main Avahi loop object */
978
1038
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
1039
if(mc.simple_poll == NULL) {
980
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
981
1041
" object.\n");
982
1042
exitcode = EXIT_FAILURE;
983
1043
goto end;
984
1044
}
985
1045
986
1046
{
987
1047
AvahiServerConfig config;
988
1048
/* Do not publish any local Zeroconf records */
991
1051
config.publish_addresses = 0;
992
1052
config.publish_workstation = 0;
993
1053
config.publish_domain = 0;
994
1054
995
1055
/* Allocate a new server */
996
1056
mc.server = avahi_server_new(avahi_simple_poll_get
997
1057
(mc.simple_poll), &config, NULL,
998
1058
NULL, &error);
999
1059
1000
1060
/* Free the Avahi configuration data */
1001
1061
avahi_server_config_free(&config);
1002
1062
}
1003
1063
1004
1064
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1065
if(mc.server == NULL) {
1006
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
1067
avahi_strerror(error));
1008
1068
exitcode = EXIT_FAILURE;
1014
1074
AVAHI_PROTO_INET6,
1015
1075
"_mandos._tcp", NULL, 0,
1016
1076
browse_callback, &mc);
1017
if (sb == NULL) {
1077
if(sb == NULL) {
1018
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1019
1079
avahi_strerror(avahi_server_errno(mc.server)));
1020
1080
exitcode = EXIT_FAILURE;
1022
1082
}
1023
1083
1024
1084
/* Run the main loop */
1025
1026
if (debug){
1085
1086
if(debug){
1027
1087
fprintf(stderr, "Starting Avahi loop search\n");
1028
1088
}
1029
1089
1030
1090
avahi_simple_poll_loop(mc.simple_poll);
1031
1091
1032
1092
end:
1033
1034
if (debug){
1093
1094
if(debug){
1035
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1036
1096
}
1037
1097
1038
1098
/* Cleanup things */
1039
if (sb != NULL)
1099
if(sb != NULL)
1040
1100
avahi_s_service_browser_free(sb);
1041
1101
1042
if (mc.server != NULL)
1102
if(mc.server != NULL)
1043
1103
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1104
1105
if(mc.simple_poll != NULL)
1046
1106
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1107
1108
if(gnutls_initalized){
1051
1109
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1132
}
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1146
free(fullname);
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1055
1157
return exitcode;
1056
1158
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0