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24.1.42
(compared to revision 237.2.37)
: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-10 20:22:27 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 63.
- Revision ID: belorn@braxen-20080810202227-nz1a4g8pxfm6051l
Added fallback to mandos-client
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
36
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
40
39
#include <stdint.h> /* uint16_t, uint32_t */
41
40
#include <stddef.h> /* NULL, size_t, ssize_t */
42
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
42
srand() */
44
43
#include <stdbool.h> /* bool, true */
45
44
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
45
strerror(), memcpy(), strcpy() */
47
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
48
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
50
sockaddr_in6, PF_INET6,
50
51
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
52
uid_t, gid_t */
53
#include <inttypes.h> /* PRIu16 */
54
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
55
struct in6_addr, inet_pton(),
56
56
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
61
57
#include <assert.h> /* assert() */
62
58
#include <errno.h> /* perror(), errno */
63
59
#include <time.h> /* time() */
64
60
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
61
SIOCSIFFLAGS, if_indextoname(),
66
62
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
68
63
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
64
getuid(), getgid(), setuid(),
70
65
setgid() */
66
#include <netinet/in.h>
71
67
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
68
#include <iso646.h> /* not, and */
73
69
#include <argp.h> /* struct argp_option, error_t, struct
74
70
argp_state, struct argp,
75
71
argp_parse(), ARGP_KEY_ARG,
87
83
#include <avahi-common/error.h>
88
84
89
85
/* GnuTLS */
90
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
functions:
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
92
87
gnutls_*
93
88
init_gnutls_session(),
94
89
GNUTLS_* */
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
97
91
GNUTLS_OPENPGP_FMT_BASE64 */
98
92
99
93
/* GPGME */
100
#include <gpgme.h> /* All GPGME types, constants and
101
functions:
94
#include <gpgme.h> /* All GPGME types, constants and functions
102
95
gpgme_*
103
96
GPGME_PROTOCOL_OpenPGP,
104
97
GPG_ERR_NO_* */
105
98
106
99
#define BUFFER_SIZE 256
107
100
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
112
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
113
103
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
115
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
106
117
107
/* Used for passing in values through the Avahi callback functions */
122
112
unsigned int dh_bits;
123
113
gnutls_dh_params_t dh_params;
124
114
const char *priority;
125
gpgme_ctx_t ctx;
126
115
} mandos_context;
127
116
128
117
/*
132
121
*/
133
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
123
size_t buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
126
if (buffer == NULL){
138
127
return 0;
139
128
}
140
129
buffer_capacity += BUFFER_SIZE;
143
132
}
144
133
145
134
/*
146
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
147
137
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
151
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
152
148
gpgme_engine_info_t engine_info;
153
149
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
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
152
}
193
153
194
154
/* Init GPGME */
195
155
gpgme_check_version(NULL);
196
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
198
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
159
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
160
return -1;
201
161
}
202
162
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){
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
206
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
167
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
168
return -1;
209
169
}
210
170
while(engine_info != NULL){
211
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
214
174
break;
215
175
}
216
176
engine_info = engine_info->next;
217
177
}
218
178
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
return false;
221
}
222
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if(not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
236
}
237
238
/*
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
241
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
246
gpgme_data_t dh_crypto, dh_plain;
247
gpgme_error_t rc;
248
ssize_t ret;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
251
252
if(debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
254
181
}
255
182
256
183
/* Create new GPGME data buffer from memory cryptotext */
257
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
185
0);
259
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
260
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
188
gpgme_strsource(rc), gpgme_strerror(rc));
262
189
return -1;
264
191
265
192
/* Create new empty GPGME data buffer for the plaintext */
266
193
rc = gpgme_data_new(&dh_plain);
267
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
268
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
196
gpgme_strsource(rc), gpgme_strerror(rc));
270
197
gpgme_data_release(dh_crypto);
271
198
return -1;
272
199
}
273
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
274
210
/* Decrypt data from the cryptotext data buffer to the plaintext
275
211
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
278
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
215
gpgme_strsource(rc), gpgme_strerror(rc));
280
216
plaintext_length = -1;
281
if(debug){
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if(result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
293
}
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
306
}
307
}
308
}
309
217
goto decrypt_end;
310
218
}
311
219
313
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
222
}
315
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
240
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
247
recipient = recipient->next;
248
}
249
}
250
}
251
}
252
316
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
319
256
plaintext_length = -1;
320
257
goto decrypt_end;
321
258
}
325
262
plaintext_capacity = adjustbuffer(plaintext,
326
263
(size_t)plaintext_length,
327
264
plaintext_capacity);
328
if(plaintext_capacity == 0){
265
if (plaintext_capacity == 0){
329
266
perror("adjustbuffer");
330
267
plaintext_length = -1;
331
268
goto decrypt_end;
334
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
272
BUFFER_SIZE);
336
273
/* Print the data, if any */
337
if(ret == 0){
274
if (ret == 0){
338
275
/* EOF */
339
276
break;
340
277
}
345
282
}
346
283
plaintext_length += ret;
347
284
}
348
285
349
286
if(debug){
350
287
fprintf(stderr, "Decrypted password is: ");
351
288
for(ssize_t i = 0; i < plaintext_length; i++){
364
301
return plaintext_length;
365
302
}
366
303
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)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
371
307
ret = "(unknown)";
372
308
return ret;
373
309
}
379
315
}
380
316
381
317
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
383
const char *seckeyfilename){
318
const char *pubkeyfile,
319
const char *seckeyfile){
384
320
int ret;
385
321
386
322
if(debug){
388
324
}
389
325
390
326
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
394
330
return -1;
395
331
}
396
332
397
if(debug){
333
if (debug){
398
334
/* "Use a log level over 10 to enable all debugging options."
399
335
* - GnuTLS manual
400
336
*/
404
340
405
341
/* OpenPGP credentials */
406
342
gnutls_certificate_allocate_credentials(&mc->cred);
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();
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
414
347
return -1;
415
348
}
416
349
417
350
if(debug){
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
420
seckeyfilename);
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
353
seckeyfile);
421
354
}
422
355
423
356
ret = gnutls_certificate_set_openpgp_key_file
424
(mc->cred, pubkeyfilename, seckeyfilename,
425
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
427
359
fprintf(stderr,
428
360
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
431
363
safer_gnutls_strerror(ret));
432
364
goto globalfail;
433
365
}
434
366
435
367
/* GnuTLS server initialization */
436
368
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
440
372
goto globalfail;
441
373
}
442
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
446
378
goto globalfail;
447
379
}
448
380
449
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
450
382
451
383
return 0;
452
384
453
385
globalfail:
454
386
455
387
gnutls_certificate_free_credentials(mc->cred);
456
388
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
458
389
return -1;
390
459
391
}
460
392
461
393
static int init_gnutls_session(mandos_context *mc,
463
395
int ret;
464
396
/* GnuTLS session creation */
465
397
ret = gnutls_init(session, GNUTLS_SERVER);
466
if(ret != GNUTLS_E_SUCCESS){
398
if (ret != GNUTLS_E_SUCCESS){
467
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
400
safer_gnutls_strerror(ret));
469
401
}
471
403
{
472
404
const char *err;
473
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
406
if (ret != GNUTLS_E_SUCCESS) {
475
407
fprintf(stderr, "Syntax error at: %s\n", err);
476
408
fprintf(stderr, "GnuTLS error: %s\n",
477
409
safer_gnutls_strerror(ret));
478
gnutls_deinit(*session);
410
gnutls_deinit (*session);
479
411
return -1;
480
412
}
481
413
}
482
414
483
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
416
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
417
if (ret != GNUTLS_E_SUCCESS) {
486
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
419
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
420
gnutls_deinit (*session);
489
421
return -1;
490
422
}
491
423
492
424
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
495
427
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
429
498
430
return 0;
499
431
}
507
439
AvahiIfIndex if_index,
508
440
mandos_context *mc){
509
441
int ret, tcp_sd;
510
ssize_t sret;
511
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
512
443
char *buffer = NULL;
513
444
char *decrypted_buffer;
519
450
char interface[IF_NAMESIZE];
520
451
gnutls_session_t session;
521
452
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
524
455
return -1;
525
456
}
526
457
534
465
perror("socket");
535
466
return -1;
536
467
}
537
468
538
469
if(debug){
539
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
471
perror("if_indextoname");
543
474
fprintf(stderr, "Binding to interface %s\n", interface);
544
475
}
545
476
546
memset(&to, 0, sizeof(to));
477
memset(&to,0,sizeof(to)); /* Spurious warning */
547
478
to.in6.sin6_family = AF_INET6;
548
479
/* It would be nice to have a way to detect if we were passed an
549
480
IPv4 address here. Now we assume an IPv6 address. */
550
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
551
if(ret < 0 ){
482
if (ret < 0 ){
552
483
perror("inet_pton");
553
484
return -1;
554
485
}
556
487
fprintf(stderr, "Bad address: %s\n", ip);
557
488
return -1;
558
489
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
490
to.in6.sin6_port = htons(port); /* Spurious warning */
562
491
563
492
to.in6.sin6_scope_id = (uint32_t)if_index;
564
493
577
506
}
578
507
579
508
ret = connect(tcp_sd, &to.in, sizeof(to));
580
if(ret < 0){
509
if (ret < 0){
581
510
perror("connect");
582
511
return -1;
583
512
}
584
513
585
514
const char *out = mandos_protocol_version;
586
515
written = 0;
587
while(true){
516
while (true){
588
517
size_t out_size = strlen(out);
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
519
out_size - written));
591
if(ret == -1){
520
if (ret == -1){
592
521
perror("write");
593
522
retval = -1;
594
523
goto mandos_end;
597
526
if(written < out_size){
598
527
continue;
599
528
} else {
600
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
601
530
written = 0;
602
531
out = "\r\n";
603
532
} else {
605
534
}
606
535
}
607
536
}
608
537
609
538
if(debug){
610
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
540
}
612
541
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
615
544
do{
616
ret = gnutls_handshake(session);
545
ret = gnutls_handshake (session);
617
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
547
619
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
620
549
if(debug){
621
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
622
gnutls_perror(ret);
551
gnutls_perror (ret);
623
552
}
624
553
retval = -1;
625
554
goto mandos_end;
631
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
632
561
ip);
633
562
}
634
563
635
564
while(true){
636
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
566
buffer_capacity);
638
if(buffer_capacity == 0){
567
if (buffer_capacity == 0){
639
568
perror("adjustbuffer");
640
569
retval = -1;
641
570
goto mandos_end;
642
571
}
643
572
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
647
576
break;
648
577
}
649
if(sret < 0){
650
switch(sret){
578
if (ret < 0){
579
switch(ret){
651
580
case GNUTLS_E_INTERRUPTED:
652
581
case GNUTLS_E_AGAIN:
653
582
break;
654
583
case GNUTLS_E_REHANDSHAKE:
655
584
do{
656
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
657
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
if(ret < 0){
587
if (ret < 0){
659
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
660
gnutls_perror(ret);
589
gnutls_perror (ret);
661
590
retval = -1;
662
591
goto mandos_end;
663
592
}
666
595
fprintf(stderr, "Unknown error while reading data from"
667
596
" encrypted session with Mandos server\n");
668
597
retval = -1;
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
599
goto mandos_end;
671
600
}
672
601
} else {
673
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
674
603
}
675
604
}
676
605
678
607
fprintf(stderr, "Closing TLS session\n");
679
608
}
680
609
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
611
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
614
buffer_length,
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
688
618
written = 0;
689
619
while(written < (size_t) decrypted_buffer_size){
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
693
623
if(ret == 0 and ferror(stdout)){
694
624
if(debug){
695
625
fprintf(stderr, "Error writing encrypted data: %s\n",
704
634
} else {
705
635
retval = -1;
706
636
}
707
} else {
708
retval = -1;
709
637
}
710
638
711
639
/* Shutdown procedure */
712
640
713
641
mandos_end:
714
642
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
643
close(tcp_sd);
644
gnutls_deinit (session);
720
645
return retval;
721
646
}
722
647
735
660
flags,
736
661
void* userdata) {
737
662
mandos_context *mc = userdata;
738
assert(r);
663
assert(r); /* Spurious warning */
739
664
740
665
/* Called whenever a service has been resolved successfully or
741
666
timed out */
742
667
743
switch(event) {
668
switch (event) {
744
669
default:
745
670
case AVAHI_RESOLVER_FAILURE:
746
671
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
754
679
avahi_address_snprint(ip, sizeof(ip), address);
755
680
if(debug){
756
681
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
682
PRIu16 ") on port %d\n", name, host_name, ip,
683
interface, port);
759
684
}
760
685
int ret = start_mandos_communication(ip, port, interface, mc);
761
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
686
if (ret == 0){
687
exit(EXIT_SUCCESS);
763
688
}
764
689
}
765
690
}
777
702
flags,
778
703
void* userdata) {
779
704
mandos_context *mc = userdata;
780
assert(b);
705
assert(b); /* Spurious warning */
781
706
782
707
/* Called whenever a new services becomes available on the LAN or
783
708
is removed from the LAN */
784
709
785
switch(event) {
710
switch (event) {
786
711
default:
787
712
case AVAHI_BROWSER_FAILURE:
788
713
797
722
the callback function is called the Avahi server will free the
798
723
resolver for us. */
799
724
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
726
protocol, name, type, domain,
802
727
AVAHI_PROTO_INET6, 0,
803
728
resolve_callback, mc)))
817
742
}
818
743
}
819
744
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
751
if (tmp == NULL){
752
return NULL;
753
}
754
if(f_len > 0){
755
memcpy(tmp, first, f_len); /* Spurious warning */
756
}
757
tmp[f_len] = '/';
758
if(s_len > 0){
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
760
}
761
tmp[f_len + 1 + s_len] = '\0';
762
return tmp;
763
}
764
765
820
766
int main(int argc, char *argv[]){
821
767
AvahiSServiceBrowser *sb = NULL;
822
768
int error;
823
769
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
770
int exitcode = EXIT_SUCCESS;
827
771
const char *interface = "eth0";
828
772
struct ifreq network;
830
774
uid_t uid;
831
775
gid_t gid;
832
776
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
838
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
781
.dh_bits = 1024, .priority = "SECURE256"};
841
782
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
783
844
784
{
845
785
struct argp_option options[] = {
846
786
{ .name = "debug", .key = 128,
847
787
.doc = "Debug mode", .group = 3 },
848
788
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
851
791
.group = 1 },
852
792
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
793
.arg = "INTERFACE",
794
.doc = "Interface that Avahi will conntect through",
795
.group = 1 },
796
{ .name = "keydir", .key = 'd',
797
.arg = "KEYDIR",
798
.doc = "Directory where the openpgp keyring is",
856
799
.group = 1 },
857
800
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
860
803
.group = 1 },
861
804
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
864
807
.group = 2 },
865
808
{ .name = "dh-bits", .key = 129,
866
809
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
810
.doc = "dh-bits to use in gnutls communication",
869
811
.group = 2 },
870
812
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
874
815
{ .name = NULL }
875
816
};
817
876
818
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
823
switch (key) {
824
case 128:
881
825
debug = true;
882
826
break;
883
case 'c': /* --connect */
827
case 'c':
884
828
connect_to = arg;
885
829
break;
886
case 'i': /* --interface */
830
case 'i':
887
831
interface = arg;
888
832
break;
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");
833
case 'd':
834
keydir = arg;
835
break;
836
case 's':
837
seckeyfile = arg;
838
break;
839
case 'p':
840
pubkeyfile = arg;
841
break;
842
case 129:
843
errno = 0;
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
845
if (errno){
846
perror("strtol");
900
847
exit(EXIT_FAILURE);
901
848
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
849
break;
904
case 130: /* --priority */
850
case 130:
905
851
mc.priority = arg;
906
852
break;
907
853
case ARGP_KEY_ARG:
908
argp_usage(state);
909
case ARGP_KEY_END:
854
argp_usage (state);
910
855
break;
856
case ARGP_KEY_END:
857
break;
911
858
default:
912
859
return ARGP_ERR_UNKNOWN;
913
860
}
914
861
return 0;
915
862
}
916
863
917
864
struct argp argp = { .options = options, .parser = parse_opt,
918
865
.args_doc = "",
919
866
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
}
928
929
/* If the interface is down, bring it up */
930
{
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
932
if(sd < 0) {
933
perror("socket");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
strcpy(network.ifr_name, interface);
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCGIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
947
if(ret == -1){
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
957
}
958
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
871
exitcode = EXIT_FAILURE;
872
goto end;
873
}
874
}
875
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
886
goto end;
887
}
888
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
890
if (ret == -1){
891
fprintf(stderr, "init_gnutls_global\n");
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
959
897
uid = getuid();
960
898
gid = getgid();
961
899
962
900
ret = setuid(uid);
963
if(ret == -1){
901
if (ret == -1){
964
902
perror("setuid");
965
903
}
966
904
967
905
setgid(gid);
968
if(ret == -1){
906
if (ret == -1){
969
907
perror("setgid");
970
908
}
971
909
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
995
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
911
if(if_index == 0){
997
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1007
922
exitcode = EXIT_FAILURE;
1008
923
goto end;
1009
924
}
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");
925
errno = 0;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
927
if(errno){
928
perror("Bad port number");
1015
929
exitcode = EXIT_FAILURE;
1016
930
goto end;
1017
931
}
1018
port = (uint16_t)tmpmax;
1019
932
*address = '\0';
1020
933
address = connect_to;
1021
934
ret = start_mandos_communication(address, port, if_index, &mc);
1027
940
goto end;
1028
941
}
1029
942
1030
if(not debug){
943
/* If the interface is down, bring it up */
944
{
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
946
if(sd < 0) {
947
perror("socket");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
953
if(ret == -1){
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
961
if(ret == -1){
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
964
goto end;
965
}
966
}
967
close(sd);
968
}
969
970
if (not debug){
1031
971
avahi_set_log_function(empty_log);
1032
972
}
1033
973
1036
976
1037
977
/* Allocate main Avahi loop object */
1038
978
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
979
if (mc.simple_poll == NULL) {
1040
980
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
981
" object.\n");
1042
982
exitcode = EXIT_FAILURE;
1043
983
goto end;
1044
984
}
1045
985
1046
986
{
1047
987
AvahiServerConfig config;
1048
988
/* Do not publish any local Zeroconf records */
1051
991
config.publish_addresses = 0;
1052
992
config.publish_workstation = 0;
1053
993
config.publish_domain = 0;
1054
994
1055
995
/* Allocate a new server */
1056
996
mc.server = avahi_server_new(avahi_simple_poll_get
1057
997
(mc.simple_poll), &config, NULL,
1058
998
NULL, &error);
1059
999
1060
1000
/* Free the Avahi configuration data */
1061
1001
avahi_server_config_free(&config);
1062
1002
}
1063
1003
1064
1004
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1005
if (mc.server == NULL) {
1066
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
1007
avahi_strerror(error));
1068
1008
exitcode = EXIT_FAILURE;
1074
1014
AVAHI_PROTO_INET6,
1075
1015
"_mandos._tcp", NULL, 0,
1076
1016
browse_callback, &mc);
1077
if(sb == NULL) {
1017
if (sb == NULL) {
1078
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1079
1019
avahi_strerror(avahi_server_errno(mc.server)));
1080
1020
exitcode = EXIT_FAILURE;
1082
1022
}
1083
1023
1084
1024
/* Run the main loop */
1085
1086
if(debug){
1025
1026
if (debug){
1087
1027
fprintf(stderr, "Starting Avahi loop search\n");
1088
1028
}
1089
1029
1090
1030
avahi_simple_poll_loop(mc.simple_poll);
1091
1031
1092
1032
end:
1093
1094
if(debug){
1033
1034
if (debug){
1095
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1096
1036
}
1097
1037
1098
1038
/* Cleanup things */
1099
if(sb != NULL)
1039
if (sb != NULL)
1100
1040
avahi_s_service_browser_free(sb);
1101
1041
1102
if(mc.server != NULL)
1042
if (mc.server != NULL)
1103
1043
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1044
1045
if (mc.simple_poll != NULL)
1106
1046
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initalized){
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1109
1051
gnutls_certificate_free_credentials(mc.cred);
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
1052
gnutls_global_deinit ();
1053
}
1054
1157
1055
return exitcode;
1158
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0