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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:35:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113043519-0yr39snphoegq8l1
* plugin-runner.c: Only space changes.
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- 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
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
49
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
49
sockaddr_in6, PF_INET6,
51
50
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
53
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
55
struct in6_addr, inet_pton(),
55
56
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, SCNu16 */
56
61
#include <assert.h> /* assert() */
57
62
#include <errno.h> /* perror(), errno */
58
63
#include <time.h> /* time() */
59
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
60
65
SIOCSIFFLAGS, if_indextoname(),
61
66
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
62
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
63
69
getuid(), getgid(), setuid(),
64
70
setgid() */
65
#include <netinet/in.h>
66
71
#include <arpa/inet.h> /* inet_pton(), htons */
67
#include <iso646.h> /* not, and */
72
#include <iso646.h> /* not, and, or */
68
73
#include <argp.h> /* struct argp_option, error_t, struct
69
74
argp_state, struct argp,
70
75
argp_parse(), ARGP_KEY_ARG,
82
87
#include <avahi-common/error.h>
83
88
84
89
/* GnuTLS */
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
90
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
functions:
86
92
gnutls_*
87
93
init_gnutls_session(),
88
94
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
90
97
GNUTLS_OPENPGP_FMT_BASE64 */
91
98
92
99
/* GPGME */
93
#include <gpgme.h> /* All GPGME types, constants and functions
100
#include <gpgme.h> /* All GPGME types, constants and
101
functions:
94
102
gpgme_*
95
103
GPGME_PROTOCOL_OpenPGP,
96
104
GPG_ERR_NO_* */
97
105
98
106
#define BUFFER_SIZE 256
99
107
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
100
112
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
102
113
static const char mandos_protocol_version[] = "1";
103
const char *argp_program_version = "password-request 1.0";
114
const char *argp_program_version = "mandos-client " VERSION;
104
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
105
116
106
117
/* Used for passing in values through the Avahi callback functions */
111
122
unsigned int dh_bits;
112
123
gnutls_dh_params_t dh_params;
113
124
const char *priority;
125
gpgme_ctx_t ctx;
114
126
} mandos_context;
115
127
116
128
/*
120
132
*/
121
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
122
134
size_t buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
125
if (buffer == NULL){
137
if(buffer == NULL){
126
138
return 0;
127
139
}
128
140
buffer_capacity += BUFFER_SIZE;
131
143
}
132
144
133
145
/*
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
146
* Initialize GPGME.
136
147
*/
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
138
size_t crypto_size,
139
char **plaintext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
142
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;
143
151
gpgme_error_t rc;
144
ssize_t ret;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
147
152
gpgme_engine_info_t engine_info;
148
153
149
if (debug){
150
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");
151
192
}
152
193
153
194
/* Init GPGME */
154
195
gpgme_check_version(NULL);
155
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
156
if (rc != GPG_ERR_NO_ERROR){
197
if(rc != GPG_ERR_NO_ERROR){
157
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
158
199
gpgme_strsource(rc), gpgme_strerror(rc));
159
return -1;
200
return false;
160
201
}
161
202
162
/* Set GPGME home directory for the OpenPGP engine only */
163
rc = gpgme_get_engine_info (&engine_info);
164
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){
165
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
166
207
gpgme_strsource(rc), gpgme_strerror(rc));
167
return -1;
208
return false;
168
209
}
169
210
while(engine_info != NULL){
170
211
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
171
212
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
172
engine_info->file_name, homedir);
213
engine_info->file_name, tempdir);
173
214
break;
174
215
}
175
216
engine_info = engine_info->next;
176
217
}
177
218
if(engine_info == NULL){
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
179
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");
180
254
}
181
255
182
256
/* Create new GPGME data buffer from memory cryptotext */
183
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
184
258
0);
185
if (rc != GPG_ERR_NO_ERROR){
259
if(rc != GPG_ERR_NO_ERROR){
186
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
187
261
gpgme_strsource(rc), gpgme_strerror(rc));
188
262
return -1;
190
264
191
265
/* Create new empty GPGME data buffer for the plaintext */
192
266
rc = gpgme_data_new(&dh_plain);
193
if (rc != GPG_ERR_NO_ERROR){
267
if(rc != GPG_ERR_NO_ERROR){
194
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
195
269
gpgme_strsource(rc), gpgme_strerror(rc));
196
270
gpgme_data_release(dh_crypto);
197
271
return -1;
198
272
}
199
273
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
206
goto decrypt_end;
207
}
208
209
274
/* Decrypt data from the cryptotext data buffer to the plaintext
210
275
data buffer */
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
213
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
214
279
gpgme_strsource(rc), gpgme_strerror(rc));
215
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
}
216
309
goto decrypt_end;
217
310
}
218
311
220
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
221
314
}
222
315
223
if (debug){
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
226
if (result == NULL){
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
228
} else {
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
235
}
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
238
if(recipient){
239
while(recipient != NULL){
240
fprintf(stderr, "Public key algorithm: %s\n",
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
242
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
243
fprintf(stderr, "Secret key available: %s\n",
244
recipient->status == GPG_ERR_NO_SECKEY
245
? "No" : "Yes");
246
recipient = recipient->next;
247
}
248
}
249
}
250
}
251
252
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
255
319
plaintext_length = -1;
256
320
goto decrypt_end;
257
321
}
261
325
plaintext_capacity = adjustbuffer(plaintext,
262
326
(size_t)plaintext_length,
263
327
plaintext_capacity);
264
if (plaintext_capacity == 0){
328
if(plaintext_capacity == 0){
265
329
perror("adjustbuffer");
266
330
plaintext_length = -1;
267
331
goto decrypt_end;
270
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
335
BUFFER_SIZE);
272
336
/* Print the data, if any */
273
if (ret == 0){
337
if(ret == 0){
274
338
/* EOF */
275
339
break;
276
340
}
281
345
}
282
346
plaintext_length += ret;
283
347
}
284
348
285
349
if(debug){
286
350
fprintf(stderr, "Decrypted password is: ");
287
351
for(ssize_t i = 0; i < plaintext_length; i++){
300
364
return plaintext_length;
301
365
}
302
366
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value);
305
if (ret == NULL)
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning */
369
if(ret == NULL)
306
370
ret = "(unknown)";
307
371
return ret;
308
372
}
314
378
}
315
379
316
380
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
319
383
int ret;
320
384
321
385
if(debug){
323
387
}
324
388
325
389
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
390
if(ret != GNUTLS_E_SUCCESS) {
391
fprintf(stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
329
393
return -1;
330
394
}
331
395
332
if (debug){
396
if(debug){
333
397
/* "Use a log level over 10 to enable all debugging options."
334
398
* - GnuTLS manual
335
399
*/
339
403
340
404
/* OpenPGP credentials */
341
405
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit();
346
411
return -1;
347
412
}
348
413
349
414
if(debug){
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
353
418
}
354
419
355
420
ret = gnutls_certificate_set_openpgp_key_file
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
423
if(ret != GNUTLS_E_SUCCESS) {
358
424
fprintf(stderr,
359
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
362
428
safer_gnutls_strerror(ret));
363
429
goto globalfail;
364
430
}
365
431
366
432
/* GnuTLS server initialization */
367
433
ret = gnutls_dh_params_init(&mc->dh_params);
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
434
if(ret != GNUTLS_E_SUCCESS) {
435
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
371
437
goto globalfail;
372
438
}
373
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
440
if(ret != GNUTLS_E_SUCCESS) {
441
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
377
443
goto globalfail;
378
444
}
379
445
380
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
381
447
382
448
return 0;
383
449
384
450
globalfail:
385
451
386
452
gnutls_certificate_free_credentials(mc->cred);
387
453
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
388
455
return -1;
389
390
456
}
391
457
392
458
static int init_gnutls_session(mandos_context *mc,
394
460
int ret;
395
461
/* GnuTLS session creation */
396
462
ret = gnutls_init(session, GNUTLS_SERVER);
397
if (ret != GNUTLS_E_SUCCESS){
463
if(ret != GNUTLS_E_SUCCESS){
398
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
399
465
safer_gnutls_strerror(ret));
400
466
}
402
468
{
403
469
const char *err;
404
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
471
if(ret != GNUTLS_E_SUCCESS) {
406
472
fprintf(stderr, "Syntax error at: %s\n", err);
407
473
fprintf(stderr, "GnuTLS error: %s\n",
408
474
safer_gnutls_strerror(ret));
409
gnutls_deinit (*session);
475
gnutls_deinit(*session);
410
476
return -1;
411
477
}
412
478
}
413
479
414
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
415
481
mc->cred);
416
if (ret != GNUTLS_E_SUCCESS) {
482
if(ret != GNUTLS_E_SUCCESS) {
417
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
418
484
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
485
gnutls_deinit(*session);
420
486
return -1;
421
487
}
422
488
423
489
/* ignore client certificate if any. */
424
gnutls_certificate_server_set_request (*session,
425
GNUTLS_CERT_IGNORE);
490
gnutls_certificate_server_set_request(*session,
491
GNUTLS_CERT_IGNORE);
426
492
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
493
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
428
494
429
495
return 0;
430
496
}
438
504
AvahiIfIndex if_index,
439
505
mandos_context *mc){
440
506
int ret, tcp_sd;
507
ssize_t sret;
441
508
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
442
509
char *buffer = NULL;
443
510
char *decrypted_buffer;
449
516
char interface[IF_NAMESIZE];
450
517
gnutls_session_t session;
451
518
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
519
ret = init_gnutls_session(mc, &session);
520
if(ret != 0){
454
521
return -1;
455
522
}
456
523
457
524
if(debug){
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
459
ip, port);
525
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
526
"\n", ip, port);
460
527
}
461
528
462
529
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
464
531
perror("socket");
465
532
return -1;
466
533
}
467
534
468
535
if(debug){
469
536
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
537
perror("if_indextoname");
473
540
fprintf(stderr, "Binding to interface %s\n", interface);
474
541
}
475
542
476
memset(&to,0,sizeof(to)); /* Spurious warning */
543
memset(&to, 0, sizeof(to));
477
544
to.in6.sin6_family = AF_INET6;
478
545
/* It would be nice to have a way to detect if we were passed an
479
546
IPv4 address here. Now we assume an IPv6 address. */
480
547
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
481
if (ret < 0 ){
548
if(ret < 0 ){
482
549
perror("inet_pton");
483
550
return -1;
484
551
}
486
553
fprintf(stderr, "Bad address: %s\n", ip);
487
554
return -1;
488
555
}
489
to.in6.sin6_port = htons(port); /* Spurious warning */
556
to.in6.sin6_port = htons(port); /* Spurious warning */
490
557
491
558
to.in6.sin6_scope_id = (uint32_t)if_index;
492
559
493
560
if(debug){
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
561
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
562
port);
495
563
char addrstr[INET6_ADDRSTRLEN] = "";
496
564
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
565
sizeof(addrstr)) == NULL){
504
572
}
505
573
506
574
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
575
if(ret < 0){
508
576
perror("connect");
509
577
return -1;
510
578
}
511
579
512
580
const char *out = mandos_protocol_version;
513
581
written = 0;
514
while (true){
582
while(true){
515
583
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
585
out_size - written));
518
if (ret == -1){
586
if(ret == -1){
519
587
perror("write");
520
588
retval = -1;
521
589
goto mandos_end;
524
592
if(written < out_size){
525
593
continue;
526
594
} else {
527
if (out == mandos_protocol_version){
595
if(out == mandos_protocol_version){
528
596
written = 0;
529
597
out = "\r\n";
530
598
} else {
532
600
}
533
601
}
534
602
}
535
603
536
604
if(debug){
537
605
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
606
}
539
607
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
608
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
609
542
610
do{
543
ret = gnutls_handshake (session);
611
ret = gnutls_handshake(session);
544
612
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
545
613
546
if (ret != GNUTLS_E_SUCCESS){
614
if(ret != GNUTLS_E_SUCCESS){
547
615
if(debug){
548
616
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
549
gnutls_perror (ret);
617
gnutls_perror(ret);
550
618
}
551
619
retval = -1;
552
620
goto mandos_end;
558
626
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
559
627
ip);
560
628
}
561
629
562
630
while(true){
563
631
buffer_capacity = adjustbuffer(&buffer, buffer_length,
564
632
buffer_capacity);
565
if (buffer_capacity == 0){
633
if(buffer_capacity == 0){
566
634
perror("adjustbuffer");
567
635
retval = -1;
568
636
goto mandos_end;
569
637
}
570
638
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
639
sret = gnutls_record_recv(session, buffer+buffer_length,
640
BUFFER_SIZE);
641
if(sret == 0){
574
642
break;
575
643
}
576
if (ret < 0){
577
switch(ret){
644
if(sret < 0){
645
switch(sret){
578
646
case GNUTLS_E_INTERRUPTED:
579
647
case GNUTLS_E_AGAIN:
580
648
break;
581
649
case GNUTLS_E_REHANDSHAKE:
582
650
do{
583
ret = gnutls_handshake (session);
651
ret = gnutls_handshake(session);
584
652
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
585
if (ret < 0){
653
if(ret < 0){
586
654
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
587
gnutls_perror (ret);
655
gnutls_perror(ret);
588
656
retval = -1;
589
657
goto mandos_end;
590
658
}
593
661
fprintf(stderr, "Unknown error while reading data from"
594
662
" encrypted session with Mandos server\n");
595
663
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
664
gnutls_bye(session, GNUTLS_SHUT_RDWR);
597
665
goto mandos_end;
598
666
}
599
667
} else {
600
buffer_length += (size_t) ret;
668
buffer_length += (size_t) sret;
601
669
}
602
670
}
603
671
605
673
fprintf(stderr, "Closing TLS session\n");
606
674
}
607
675
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
gnutls_bye(session, GNUTLS_SHUT_RDWR);
609
677
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
if(buffer_length > 0){
679
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
612
680
buffer_length,
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
681
&decrypted_buffer);
682
if(decrypted_buffer_size >= 0){
616
683
written = 0;
617
684
while(written < (size_t) decrypted_buffer_size){
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
685
ret = (int)fwrite(decrypted_buffer + written, 1,
686
(size_t)decrypted_buffer_size - written,
687
stdout);
621
688
if(ret == 0 and ferror(stdout)){
622
689
if(debug){
623
690
fprintf(stderr, "Error writing encrypted data: %s\n",
632
699
} else {
633
700
retval = -1;
634
701
}
702
} else {
703
retval = -1;
635
704
}
636
705
637
706
/* Shutdown procedure */
638
707
639
708
mandos_end:
640
709
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
710
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
711
if(ret == -1){
712
perror("close");
713
}
714
gnutls_deinit(session);
643
715
return retval;
644
716
}
645
717
658
730
flags,
659
731
void* userdata) {
660
732
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
733
assert(r);
662
734
663
735
/* Called whenever a service has been resolved successfully or
664
736
timed out */
665
737
666
switch (event) {
738
switch(event) {
667
739
default:
668
740
case AVAHI_RESOLVER_FAILURE:
669
741
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
676
748
char ip[AVAHI_ADDRESS_STR_MAX];
677
749
avahi_address_snprint(ip, sizeof(ip), address);
678
750
if(debug){
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
751
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
752
PRIu16 ") on port %d\n", name, host_name, ip,
753
interface, port);
681
754
}
682
755
int ret = start_mandos_communication(ip, port, interface, mc);
683
if (ret == 0){
684
exit(EXIT_SUCCESS);
756
if(ret == 0){
757
avahi_simple_poll_quit(mc->simple_poll);
685
758
}
686
759
}
687
760
}
699
772
flags,
700
773
void* userdata) {
701
774
mandos_context *mc = userdata;
702
assert(b); /* Spurious warning */
775
assert(b);
703
776
704
777
/* Called whenever a new services becomes available on the LAN or
705
778
is removed from the LAN */
706
779
707
switch (event) {
780
switch(event) {
708
781
default:
709
782
case AVAHI_BROWSER_FAILURE:
710
783
719
792
the callback function is called the Avahi server will free the
720
793
resolver for us. */
721
794
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
if(!(avahi_s_service_resolver_new(mc->server, interface,
723
796
protocol, name, type, domain,
724
797
AVAHI_PROTO_INET6, 0,
725
798
resolve_callback, mc)))
739
812
}
740
813
}
741
814
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
748
if (tmp == NULL){
749
return NULL;
750
}
751
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
753
}
754
tmp[f_len] = '/';
755
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
757
}
758
tmp[f_len + 1 + s_len] = '\0';
759
return tmp;
760
}
761
762
763
815
int main(int argc, char *argv[]){
764
816
AvahiSServiceBrowser *sb = NULL;
765
817
int error;
771
823
uid_t uid;
772
824
gid_t gid;
773
825
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
774
827
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
830
777
831
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
832
.dh_bits = 1024, .priority = "SECURE256"
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
779
834
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
780
836
781
837
{
782
838
struct argp_option options[] = {
783
839
{ .name = "debug", .key = 128,
784
840
.doc = "Debug mode", .group = 3 },
785
841
{ .name = "connect", .key = 'c',
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
842
.arg = "ADDRESS:PORT",
843
.doc = "Connect directly to a specific Mandos server",
788
844
.group = 1 },
789
845
{ .name = "interface", .key = 'i',
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
846
.arg = "NAME",
847
.doc = "Interface that will be used to search for Mandos"
848
" servers",
796
849
.group = 1 },
797
850
{ .name = "seckey", .key = 's',
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
851
.arg = "FILE",
852
.doc = "OpenPGP secret key file base name",
800
853
.group = 1 },
801
854
{ .name = "pubkey", .key = 'p',
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
855
.arg = "FILE",
856
.doc = "OpenPGP public key file base name",
804
857
.group = 2 },
805
858
{ .name = "dh-bits", .key = 129,
806
859
.arg = "BITS",
807
.doc = "dh-bits to use in gnutls communication",
860
.doc = "Bit length of the prime number used in the"
861
" Diffie-Hellman key exchange",
808
862
.group = 2 },
809
863
{ .name = "priority", .key = 130,
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
864
.arg = "STRING",
865
.doc = "GnuTLS priority string for the TLS handshake",
866
.group = 1 },
812
867
{ .name = NULL }
813
868
};
814
815
869
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128:
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
872
switch(key) {
873
case 128: /* --debug */
822
874
debug = true;
823
875
break;
824
case 'c':
876
case 'c': /* --connect */
825
877
connect_to = arg;
826
878
break;
827
case 'i':
879
case 'i': /* --interface */
828
880
interface = arg;
829
881
break;
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyfile = arg;
835
break;
836
case 'p':
837
pubkeyfile = arg;
838
break;
839
case 129:
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
ret = sscanf(arg, "%u", &mc.dh_bits);
890
if(ret != 1){
891
fprintf(stderr, "Bad number of DH bits\n");
844
892
exit(EXIT_FAILURE);
845
893
}
846
894
break;
847
case 130:
895
case 130: /* --priority */
848
896
mc.priority = arg;
849
897
break;
850
898
case ARGP_KEY_ARG:
851
argp_usage (state);
899
argp_usage(state);
900
case ARGP_KEY_END:
852
901
break;
853
case ARGP_KEY_END:
854
break;
855
902
default:
856
903
return ARGP_ERR_UNKNOWN;
857
904
}
858
905
return 0;
859
906
}
860
907
861
908
struct argp argp = { .options = options, .parser = parse_opt,
862
909
.args_doc = "",
863
910
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
}
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global\n");
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
911
" passwords from a Mandos server" };
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
920
/* If the interface is down, bring it up */
921
{
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
if(sd < 0) {
924
perror("socket");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
if(ret == -1){
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
933
goto end;
934
}
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
if(ret == -1){
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
941
goto end;
942
}
943
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
948
}
949
894
950
uid = getuid();
895
951
gid = getgid();
896
952
897
953
ret = setuid(uid);
898
if (ret == -1){
954
if(ret == -1){
899
955
perror("setuid");
900
956
}
901
957
902
958
setgid(gid);
903
if (ret == -1){
959
if(ret == -1){
904
960
perror("setgid");
905
961
}
906
962
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if(ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
984
}
985
907
986
if_index = (AvahiIfIndex) if_nametoindex(interface);
908
987
if(if_index == 0){
909
988
fprintf(stderr, "No such interface: \"%s\"\n", interface);
919
998
exitcode = EXIT_FAILURE;
920
999
goto end;
921
1000
}
922
errno = 0;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
924
if(errno){
925
perror("Bad port number");
1001
uint16_t port;
1002
ret = sscanf(address+1, "%" SCNu16, &port);
1003
if(ret != 1){
1004
fprintf(stderr, "Bad port number\n");
926
1005
exitcode = EXIT_FAILURE;
927
1006
goto end;
928
1007
}
937
1016
goto end;
938
1017
}
939
1018
940
/* If the interface is down, bring it up */
941
{
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
943
if(sd < 0) {
944
perror("socket");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
950
if(ret == -1){
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
958
if(ret == -1){
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
}
964
close(sd);
965
}
966
967
if (not debug){
1019
if(not debug){
968
1020
avahi_set_log_function(empty_log);
969
1021
}
970
1022
973
1025
974
1026
/* Allocate main Avahi loop object */
975
1027
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
1028
if(mc.simple_poll == NULL) {
977
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
978
1030
" object.\n");
979
1031
exitcode = EXIT_FAILURE;
980
1032
goto end;
981
1033
}
982
1034
983
1035
{
984
1036
AvahiServerConfig config;
985
1037
/* Do not publish any local Zeroconf records */
988
1040
config.publish_addresses = 0;
989
1041
config.publish_workstation = 0;
990
1042
config.publish_domain = 0;
991
1043
992
1044
/* Allocate a new server */
993
1045
mc.server = avahi_server_new(avahi_simple_poll_get
994
1046
(mc.simple_poll), &config, NULL,
995
1047
NULL, &error);
996
1048
997
1049
/* Free the Avahi configuration data */
998
1050
avahi_server_config_free(&config);
999
1051
}
1000
1052
1001
1053
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1054
if(mc.server == NULL) {
1003
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
1056
avahi_strerror(error));
1005
1057
exitcode = EXIT_FAILURE;
1011
1063
AVAHI_PROTO_INET6,
1012
1064
"_mandos._tcp", NULL, 0,
1013
1065
browse_callback, &mc);
1014
if (sb == NULL) {
1066
if(sb == NULL) {
1015
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1016
1068
avahi_strerror(avahi_server_errno(mc.server)));
1017
1069
exitcode = EXIT_FAILURE;
1019
1071
}
1020
1072
1021
1073
/* Run the main loop */
1022
1023
if (debug){
1074
1075
if(debug){
1024
1076
fprintf(stderr, "Starting Avahi loop search\n");
1025
1077
}
1026
1078
1027
1079
avahi_simple_poll_loop(mc.simple_poll);
1028
1080
1029
1081
end:
1030
1031
if (debug){
1082
1083
if(debug){
1032
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1033
1085
}
1034
1086
1035
1087
/* Cleanup things */
1036
if (sb != NULL)
1088
if(sb != NULL)
1037
1089
avahi_s_service_browser_free(sb);
1038
1090
1039
if (mc.server != NULL)
1091
if(mc.server != NULL)
1040
1092
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1093
1094
if(mc.simple_poll != NULL)
1043
1095
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfile);
1045
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1096
1097
if(gnutls_initalized){
1048
1098
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1099
gnutls_global_deinit();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
if(errno != ENOENT){
1114
perror("opendir");
1115
}
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if(direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1 and errno != ENOENT){
1142
perror("rmdir");
1143
}
1144
}
1145
1052
1146
return exitcode;
1053
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0