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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
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, SCNu16 */
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 */
369
if(ret == NULL)
305
370
ret = "(unknown)";
306
371
return ret;
307
372
}
313
378
}
314
379
315
380
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
318
383
int ret;
319
384
320
385
if(debug){
322
387
}
323
388
324
389
ret = gnutls_global_init();
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
390
if(ret != GNUTLS_E_SUCCESS) {
391
fprintf(stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
328
393
return -1;
329
394
}
330
395
331
if (debug){
396
if(debug){
332
397
/* "Use a log level over 10 to enable all debugging options."
333
398
* - GnuTLS manual
334
399
*/
338
403
339
404
/* OpenPGP credentials */
340
405
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 ();
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();
345
411
return -1;
346
412
}
347
413
348
414
if(debug){
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
352
418
}
353
419
354
420
ret = gnutls_certificate_set_openpgp_key_file
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
423
if(ret != GNUTLS_E_SUCCESS) {
357
424
fprintf(stderr,
358
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
361
428
safer_gnutls_strerror(ret));
362
429
goto globalfail;
363
430
}
364
431
365
432
/* GnuTLS server initialization */
366
433
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));
434
if(ret != GNUTLS_E_SUCCESS) {
435
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
370
437
goto globalfail;
371
438
}
372
439
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));
440
if(ret != GNUTLS_E_SUCCESS) {
441
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
376
443
goto globalfail;
377
444
}
378
445
379
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
447
381
448
return 0;
382
449
383
450
globalfail:
384
451
385
452
gnutls_certificate_free_credentials(mc->cred);
386
453
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
387
455
return -1;
388
389
456
}
390
457
391
458
static int init_gnutls_session(mandos_context *mc,
393
460
int ret;
394
461
/* GnuTLS session creation */
395
462
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
463
if(ret != GNUTLS_E_SUCCESS){
397
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
398
465
safer_gnutls_strerror(ret));
399
466
}
401
468
{
402
469
const char *err;
403
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
471
if(ret != GNUTLS_E_SUCCESS) {
405
472
fprintf(stderr, "Syntax error at: %s\n", err);
406
473
fprintf(stderr, "GnuTLS error: %s\n",
407
474
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
475
gnutls_deinit(*session);
409
476
return -1;
410
477
}
411
478
}
412
479
413
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
481
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
482
if(ret != GNUTLS_E_SUCCESS) {
416
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
417
484
safer_gnutls_strerror(ret));
418
gnutls_deinit (*session);
485
gnutls_deinit(*session);
419
486
return -1;
420
487
}
421
488
422
489
/* ignore client certificate if any. */
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
490
gnutls_certificate_server_set_request(*session,
491
GNUTLS_CERT_IGNORE);
425
492
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
493
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
427
494
428
495
return 0;
429
496
}
437
504
AvahiIfIndex if_index,
438
505
mandos_context *mc){
439
506
int ret, tcp_sd;
507
ssize_t sret;
440
508
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
441
509
char *buffer = NULL;
442
510
char *decrypted_buffer;
448
516
char interface[IF_NAMESIZE];
449
517
gnutls_session_t session;
450
518
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
519
ret = init_gnutls_session(mc, &session);
520
if(ret != 0){
453
521
return -1;
454
522
}
455
523
463
531
perror("socket");
464
532
return -1;
465
533
}
466
534
467
535
if(debug){
468
536
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
537
perror("if_indextoname");
472
540
fprintf(stderr, "Binding to interface %s\n", interface);
473
541
}
474
542
475
memset(&to,0,sizeof(to)); /* Spurious warning */
543
memset(&to, 0, sizeof(to));
476
544
to.in6.sin6_family = AF_INET6;
477
545
/* It would be nice to have a way to detect if we were passed an
478
546
IPv4 address here. Now we assume an IPv6 address. */
479
547
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
if (ret < 0 ){
548
if(ret < 0 ){
481
549
perror("inet_pton");
482
550
return -1;
483
551
}
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'"
681
753
interface, port);
682
754
}
683
755
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
756
if(ret == 0){
757
avahi_simple_poll_quit(mc->simple_poll);
686
758
}
687
759
}
688
760
}
700
772
flags,
701
773
void* userdata) {
702
774
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
775
assert(b);
704
776
705
777
/* Called whenever a new services becomes available on the LAN or
706
778
is removed from the LAN */
707
779
708
switch (event) {
780
switch(event) {
709
781
default:
710
782
case AVAHI_BROWSER_FAILURE:
711
783
720
792
the callback function is called the Avahi server will free the
721
793
resolver for us. */
722
794
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
if(!(avahi_s_service_resolver_new(mc->server, interface,
724
796
protocol, name, type, domain,
725
797
AVAHI_PROTO_INET6, 0,
726
798
resolve_callback, mc)))
740
812
}
741
813
}
742
814
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
815
int main(int argc, char *argv[]){
765
816
AvahiSServiceBrowser *sb = NULL;
766
817
int error;
772
823
uid_t uid;
773
824
gid_t gid;
774
825
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
775
827
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
830
778
831
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
832
.dh_bits = 1024, .priority = "SECURE256"
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
780
834
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
781
836
782
837
{
783
838
struct argp_option options[] = {
784
839
{ .name = "debug", .key = 128,
785
840
.doc = "Debug mode", .group = 3 },
786
841
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
842
.arg = "ADDRESS:PORT",
843
.doc = "Connect directly to a specific Mandos server",
789
844
.group = 1 },
790
845
{ .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",
846
.arg = "NAME",
847
.doc = "Interface that will be used to search for Mandos"
848
" servers",
797
849
.group = 1 },
798
850
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
851
.arg = "FILE",
852
.doc = "OpenPGP secret key file base name",
801
853
.group = 1 },
802
854
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
855
.arg = "FILE",
856
.doc = "OpenPGP public key file base name",
805
857
.group = 2 },
806
858
{ .name = "dh-bits", .key = 129,
807
859
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
860
.doc = "Bit length of the prime number used in the"
861
" Diffie-Hellman key exchange",
809
862
.group = 2 },
810
863
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
864
.arg = "STRING",
865
.doc = "GnuTLS priority string for the TLS handshake",
866
.group = 1 },
813
867
{ .name = NULL }
814
868
};
815
816
869
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:
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
872
switch(key) {
873
case 128: /* --debug */
823
874
debug = true;
824
875
break;
825
case 'c':
876
case 'c': /* --connect */
826
877
connect_to = arg;
827
878
break;
828
case 'i':
879
case 'i': /* --interface */
829
880
interface = arg;
830
881
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");
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");
845
892
exit(EXIT_FAILURE);
846
893
}
847
894
break;
848
case 130:
895
case 130: /* --priority */
849
896
mc.priority = arg;
850
897
break;
851
898
case ARGP_KEY_ARG:
852
argp_usage (state);
899
argp_usage(state);
900
case ARGP_KEY_END:
853
901
break;
854
case ARGP_KEY_END:
855
break;
856
902
default:
857
903
return ARGP_ERR_UNKNOWN;
858
904
}
859
905
return 0;
860
906
}
861
907
862
908
struct argp argp = { .options = options, .parser = parse_opt,
863
909
.args_doc = "",
864
910
.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){
911
" passwords from a Mandos server" };
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
868
914
fprintf(stderr, "Unknown error while parsing arguments\n");
869
915
exitcode = EXIT_FAILURE;
870
916
goto end;
871
917
}
872
918
}
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
919
897
920
/* If the interface is down, bring it up */
898
921
{
902
925
exitcode = EXIT_FAILURE;
903
926
goto end;
904
927
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
928
strcpy(network.ifr_name, interface);
906
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
930
if(ret == -1){
908
931
perror("ioctl SIOCGIFFLAGS");
918
941
goto end;
919
942
}
920
943
}
921
close(sd);
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
922
948
}
923
949
924
950
uid = getuid();
925
951
gid = getgid();
926
952
927
953
ret = setuid(uid);
928
if (ret == -1){
954
if(ret == -1){
929
955
perror("setuid");
930
956
}
931
957
932
958
setgid(gid);
933
if (ret == -1){
959
if(ret == -1){
934
960
perror("setgid");
935
961
}
936
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
937
986
if_index = (AvahiIfIndex) if_nametoindex(interface);
938
987
if(if_index == 0){
939
988
fprintf(stderr, "No such interface: \"%s\"\n", interface);
949
998
exitcode = EXIT_FAILURE;
950
999
goto end;
951
1000
}
952
errno = 0;
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
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");
956
1005
exitcode = EXIT_FAILURE;
957
1006
goto end;
958
1007
}
967
1016
goto end;
968
1017
}
969
1018
970
if (not debug){
1019
if(not debug){
971
1020
avahi_set_log_function(empty_log);
972
1021
}
973
1022
976
1025
977
1026
/* Allocate main Avahi loop object */
978
1027
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
1028
if(mc.simple_poll == NULL) {
980
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
981
1030
" object.\n");
982
1031
exitcode = EXIT_FAILURE;
983
1032
goto end;
984
1033
}
985
1034
986
1035
{
987
1036
AvahiServerConfig config;
988
1037
/* Do not publish any local Zeroconf records */
991
1040
config.publish_addresses = 0;
992
1041
config.publish_workstation = 0;
993
1042
config.publish_domain = 0;
994
1043
995
1044
/* Allocate a new server */
996
1045
mc.server = avahi_server_new(avahi_simple_poll_get
997
1046
(mc.simple_poll), &config, NULL,
998
1047
NULL, &error);
999
1048
1000
1049
/* Free the Avahi configuration data */
1001
1050
avahi_server_config_free(&config);
1002
1051
}
1003
1052
1004
1053
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1054
if(mc.server == NULL) {
1006
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
1056
avahi_strerror(error));
1008
1057
exitcode = EXIT_FAILURE;
1014
1063
AVAHI_PROTO_INET6,
1015
1064
"_mandos._tcp", NULL, 0,
1016
1065
browse_callback, &mc);
1017
if (sb == NULL) {
1066
if(sb == NULL) {
1018
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1019
1068
avahi_strerror(avahi_server_errno(mc.server)));
1020
1069
exitcode = EXIT_FAILURE;
1022
1071
}
1023
1072
1024
1073
/* Run the main loop */
1025
1026
if (debug){
1074
1075
if(debug){
1027
1076
fprintf(stderr, "Starting Avahi loop search\n");
1028
1077
}
1029
1078
1030
1079
avahi_simple_poll_loop(mc.simple_poll);
1031
1080
1032
1081
end:
1033
1034
if (debug){
1082
1083
if(debug){
1035
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1036
1085
}
1037
1086
1038
1087
/* Cleanup things */
1039
if (sb != NULL)
1088
if(sb != NULL)
1040
1089
avahi_s_service_browser_free(sb);
1041
1090
1042
if (mc.server != NULL)
1091
if(mc.server != NULL)
1043
1092
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1093
1094
if(mc.simple_poll != NULL)
1046
1095
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1096
1097
if(gnutls_initalized){
1051
1098
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
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
1055
1146
return exitcode;
1056
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0