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- Committer: Teddy Hogeborn
- Date: 2008-08-12 19:22:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20080812192234-8bm17713ltih9ud1
* initramfs-tools-hook: New.
* initramfs-tools-hook-conf: New.
* initramfs-tools-hook-conf: New.
- 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 */
48
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
48
sockaddr_in6, PF_INET6,
50
49
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
53
struct in6_addr, inet_pton(),
56
54
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
61
55
#include <assert.h> /* assert() */
62
56
#include <errno.h> /* perror(), errno */
63
57
#include <time.h> /* time() */
64
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
59
SIOCSIFFLAGS, if_indextoname(),
66
60
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
68
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
62
getuid(), getgid(), setuid(),
70
63
setgid() */
64
#include <netinet/in.h>
71
65
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
66
#include <iso646.h> /* not, and */
73
67
#include <argp.h> /* struct argp_option, error_t, struct
74
68
argp_state, struct argp,
75
69
argp_parse(), ARGP_KEY_ARG,
87
81
#include <avahi-common/error.h>
88
82
89
83
/* GnuTLS */
90
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
92
85
gnutls_*
93
86
init_gnutls_session(),
94
87
GNUTLS_* */
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
97
89
GNUTLS_OPENPGP_FMT_BASE64 */
98
90
99
91
/* GPGME */
100
#include <gpgme.h> /* All GPGME types, constants and
101
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
102
93
gpgme_*
103
94
GPGME_PROTOCOL_OpenPGP,
104
95
GPG_ERR_NO_* */
105
96
106
97
#define BUFFER_SIZE 256
107
98
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
112
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
113
101
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client " VERSION;
102
const char *argp_program_version = "password-request 1.0";
115
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
104
117
105
/* Used for passing in values through the Avahi callback functions */
122
110
unsigned int dh_bits;
123
111
gnutls_dh_params_t dh_params;
124
112
const char *priority;
125
gpgme_ctx_t ctx;
126
113
} mandos_context;
127
114
128
115
/*
132
119
*/
133
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
121
size_t buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
124
if (buffer == NULL){
138
125
return 0;
139
126
}
140
127
buffer_capacity += BUFFER_SIZE;
143
130
}
144
131
145
132
/*
146
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
147
135
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
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;
151
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
152
146
gpgme_engine_info_t engine_info;
153
147
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");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
150
}
193
151
194
152
/* Init GPGME */
195
153
gpgme_check_version(NULL);
196
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if(rc != GPG_ERR_NO_ERROR){
155
if (rc != GPG_ERR_NO_ERROR){
198
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
157
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
158
return -1;
201
159
}
202
160
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){
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){
206
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
165
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
166
return -1;
209
167
}
210
168
while(engine_info != NULL){
211
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
214
172
break;
215
173
}
216
174
engine_info = engine_info->next;
217
175
}
218
176
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");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
254
179
}
255
180
256
181
/* Create new GPGME data buffer from memory cryptotext */
257
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
183
0);
259
if(rc != GPG_ERR_NO_ERROR){
184
if (rc != GPG_ERR_NO_ERROR){
260
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
186
gpgme_strsource(rc), gpgme_strerror(rc));
262
187
return -1;
264
189
265
190
/* Create new empty GPGME data buffer for the plaintext */
266
191
rc = gpgme_data_new(&dh_plain);
267
if(rc != GPG_ERR_NO_ERROR){
192
if (rc != GPG_ERR_NO_ERROR){
268
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
194
gpgme_strsource(rc), gpgme_strerror(rc));
270
195
gpgme_data_release(dh_crypto);
271
196
return -1;
272
197
}
273
198
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
274
208
/* Decrypt data from the cryptotext data buffer to the plaintext
275
209
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
278
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
213
gpgme_strsource(rc), gpgme_strerror(rc));
280
214
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
215
goto decrypt_end;
310
216
}
311
217
313
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
220
}
315
221
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
316
251
/* 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");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
319
254
plaintext_length = -1;
320
255
goto decrypt_end;
321
256
}
325
260
plaintext_capacity = adjustbuffer(plaintext,
326
261
(size_t)plaintext_length,
327
262
plaintext_capacity);
328
if(plaintext_capacity == 0){
263
if (plaintext_capacity == 0){
329
264
perror("adjustbuffer");
330
265
plaintext_length = -1;
331
266
goto decrypt_end;
334
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
270
BUFFER_SIZE);
336
271
/* Print the data, if any */
337
if(ret == 0){
272
if (ret == 0){
338
273
/* EOF */
339
274
break;
340
275
}
345
280
}
346
281
plaintext_length += ret;
347
282
}
348
283
349
284
if(debug){
350
285
fprintf(stderr, "Decrypted password is: ");
351
286
for(ssize_t i = 0; i < plaintext_length; i++){
364
299
return plaintext_length;
365
300
}
366
301
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)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
371
305
ret = "(unknown)";
372
306
return ret;
373
307
}
379
313
}
380
314
381
315
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
383
const char *seckeyfilename){
316
const char *pubkeyfile,
317
const char *seckeyfile){
384
318
int ret;
385
319
386
320
if(debug){
388
322
}
389
323
390
324
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
394
328
return -1;
395
329
}
396
330
397
if(debug){
331
if (debug){
398
332
/* "Use a log level over 10 to enable all debugging options."
399
333
* - GnuTLS manual
400
334
*/
404
338
405
339
/* OpenPGP credentials */
406
340
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();
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
414
345
return -1;
415
346
}
416
347
417
348
if(debug){
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
420
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
421
352
}
422
353
423
354
ret = gnutls_certificate_set_openpgp_key_file
424
(mc->cred, pubkeyfilename, seckeyfilename,
425
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
427
357
fprintf(stderr,
428
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
431
361
safer_gnutls_strerror(ret));
432
362
goto globalfail;
433
363
}
434
364
435
365
/* GnuTLS server initialization */
436
366
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));
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
440
370
goto globalfail;
441
371
}
442
372
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));
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
446
376
goto globalfail;
447
377
}
448
378
449
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
450
380
451
381
return 0;
452
382
453
383
globalfail:
454
384
455
385
gnutls_certificate_free_credentials(mc->cred);
456
386
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
458
387
return -1;
388
459
389
}
460
390
461
391
static int init_gnutls_session(mandos_context *mc,
463
393
int ret;
464
394
/* GnuTLS session creation */
465
395
ret = gnutls_init(session, GNUTLS_SERVER);
466
if(ret != GNUTLS_E_SUCCESS){
396
if (ret != GNUTLS_E_SUCCESS){
467
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
398
safer_gnutls_strerror(ret));
469
399
}
471
401
{
472
402
const char *err;
473
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
404
if (ret != GNUTLS_E_SUCCESS) {
475
405
fprintf(stderr, "Syntax error at: %s\n", err);
476
406
fprintf(stderr, "GnuTLS error: %s\n",
477
407
safer_gnutls_strerror(ret));
478
gnutls_deinit(*session);
408
gnutls_deinit (*session);
479
409
return -1;
480
410
}
481
411
}
482
412
483
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
414
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
415
if (ret != GNUTLS_E_SUCCESS) {
486
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
417
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
418
gnutls_deinit (*session);
489
419
return -1;
490
420
}
491
421
492
422
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
495
425
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
427
498
428
return 0;
499
429
}
507
437
AvahiIfIndex if_index,
508
438
mandos_context *mc){
509
439
int ret, tcp_sd;
510
ssize_t sret;
511
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
512
441
char *buffer = NULL;
513
442
char *decrypted_buffer;
519
448
char interface[IF_NAMESIZE];
520
449
gnutls_session_t session;
521
450
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
524
453
return -1;
525
454
}
526
455
534
463
perror("socket");
535
464
return -1;
536
465
}
537
466
538
467
if(debug){
539
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
469
perror("if_indextoname");
543
472
fprintf(stderr, "Binding to interface %s\n", interface);
544
473
}
545
474
546
memset(&to, 0, sizeof(to));
475
memset(&to,0,sizeof(to)); /* Spurious warning */
547
476
to.in6.sin6_family = AF_INET6;
548
477
/* It would be nice to have a way to detect if we were passed an
549
478
IPv4 address here. Now we assume an IPv6 address. */
550
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
551
if(ret < 0 ){
480
if (ret < 0 ){
552
481
perror("inet_pton");
553
482
return -1;
554
483
}
556
485
fprintf(stderr, "Bad address: %s\n", ip);
557
486
return -1;
558
487
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
488
to.in6.sin6_port = htons(port); /* Spurious warning */
562
489
563
490
to.in6.sin6_scope_id = (uint32_t)if_index;
564
491
577
504
}
578
505
579
506
ret = connect(tcp_sd, &to.in, sizeof(to));
580
if(ret < 0){
507
if (ret < 0){
581
508
perror("connect");
582
509
return -1;
583
510
}
584
511
585
512
const char *out = mandos_protocol_version;
586
513
written = 0;
587
while(true){
514
while (true){
588
515
size_t out_size = strlen(out);
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
517
out_size - written));
591
if(ret == -1){
518
if (ret == -1){
592
519
perror("write");
593
520
retval = -1;
594
521
goto mandos_end;
597
524
if(written < out_size){
598
525
continue;
599
526
} else {
600
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
601
528
written = 0;
602
529
out = "\r\n";
603
530
} else {
605
532
}
606
533
}
607
534
}
608
535
609
536
if(debug){
610
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
538
}
612
539
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
615
542
do{
616
ret = gnutls_handshake(session);
543
ret = gnutls_handshake (session);
617
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
545
619
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
620
547
if(debug){
621
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
622
gnutls_perror(ret);
549
gnutls_perror (ret);
623
550
}
624
551
retval = -1;
625
552
goto mandos_end;
631
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
632
559
ip);
633
560
}
634
561
635
562
while(true){
636
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
564
buffer_capacity);
638
if(buffer_capacity == 0){
565
if (buffer_capacity == 0){
639
566
perror("adjustbuffer");
640
567
retval = -1;
641
568
goto mandos_end;
642
569
}
643
570
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
647
574
break;
648
575
}
649
if(sret < 0){
650
switch(sret){
576
if (ret < 0){
577
switch(ret){
651
578
case GNUTLS_E_INTERRUPTED:
652
579
case GNUTLS_E_AGAIN:
653
580
break;
654
581
case GNUTLS_E_REHANDSHAKE:
655
582
do{
656
ret = gnutls_handshake(session);
583
ret = gnutls_handshake (session);
657
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
if(ret < 0){
585
if (ret < 0){
659
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
660
gnutls_perror(ret);
587
gnutls_perror (ret);
661
588
retval = -1;
662
589
goto mandos_end;
663
590
}
666
593
fprintf(stderr, "Unknown error while reading data from"
667
594
" encrypted session with Mandos server\n");
668
595
retval = -1;
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
597
goto mandos_end;
671
598
}
672
599
} else {
673
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
674
601
}
675
602
}
676
603
678
605
fprintf(stderr, "Closing TLS session\n");
679
606
}
680
607
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
609
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
612
buffer_length,
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
688
616
written = 0;
689
617
while(written < (size_t) decrypted_buffer_size){
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
693
621
if(ret == 0 and ferror(stdout)){
694
622
if(debug){
695
623
fprintf(stderr, "Error writing encrypted data: %s\n",
704
632
} else {
705
633
retval = -1;
706
634
}
707
} else {
708
retval = -1;
709
635
}
710
636
711
637
/* Shutdown procedure */
712
638
713
639
mandos_end:
714
640
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
641
close(tcp_sd);
642
gnutls_deinit (session);
720
643
return retval;
721
644
}
722
645
735
658
flags,
736
659
void* userdata) {
737
660
mandos_context *mc = userdata;
738
assert(r);
661
assert(r); /* Spurious warning */
739
662
740
663
/* Called whenever a service has been resolved successfully or
741
664
timed out */
742
665
743
switch(event) {
666
switch (event) {
744
667
default:
745
668
case AVAHI_RESOLVER_FAILURE:
746
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
754
677
avahi_address_snprint(ip, sizeof(ip), address);
755
678
if(debug){
756
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
759
682
}
760
683
int ret = start_mandos_communication(ip, port, interface, mc);
761
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
763
686
}
764
687
}
765
688
}
777
700
flags,
778
701
void* userdata) {
779
702
mandos_context *mc = userdata;
780
assert(b);
703
assert(b); /* Spurious warning */
781
704
782
705
/* Called whenever a new services becomes available on the LAN or
783
706
is removed from the LAN */
784
707
785
switch(event) {
708
switch (event) {
786
709
default:
787
710
case AVAHI_BROWSER_FAILURE:
788
711
797
720
the callback function is called the Avahi server will free the
798
721
resolver for us. */
799
722
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
724
protocol, name, type, domain,
802
725
AVAHI_PROTO_INET6, 0,
803
726
resolve_callback, mc)))
817
740
}
818
741
}
819
742
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
820
764
int main(int argc, char *argv[]){
821
765
AvahiSServiceBrowser *sb = NULL;
822
766
int error;
823
767
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
768
int exitcode = EXIT_SUCCESS;
827
769
const char *interface = "eth0";
828
770
struct ifreq network;
830
772
uid_t uid;
831
773
gid_t gid;
832
774
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
838
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
779
.dh_bits = 1024, .priority = "SECURE256"};
841
780
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
781
844
782
{
845
783
struct argp_option options[] = {
846
784
{ .name = "debug", .key = 128,
847
785
.doc = "Debug mode", .group = 3 },
848
786
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
851
789
.group = 1 },
852
790
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
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",
856
797
.group = 1 },
857
798
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
860
801
.group = 1 },
861
802
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
864
805
.group = 2 },
865
806
{ .name = "dh-bits", .key = 129,
866
807
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
808
.doc = "dh-bits to use in gnutls communication",
869
809
.group = 2 },
870
810
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
874
813
{ .name = NULL }
875
814
};
815
876
816
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
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:
881
823
debug = true;
882
824
break;
883
case 'c': /* --connect */
825
case 'c':
884
826
connect_to = arg;
885
827
break;
886
case 'i': /* --interface */
828
case 'i':
887
829
interface = arg;
888
830
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");
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");
900
845
exit(EXIT_FAILURE);
901
846
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
847
break;
904
case 130: /* --priority */
848
case 130:
905
849
mc.priority = arg;
906
850
break;
907
851
case ARGP_KEY_ARG:
908
argp_usage(state);
909
case ARGP_KEY_END:
852
argp_usage (state);
910
853
break;
854
case ARGP_KEY_END:
855
break;
911
856
default:
912
857
return ARGP_ERR_UNKNOWN;
913
858
}
914
859
return 0;
915
860
}
916
861
917
862
struct argp argp = { .options = options, .parser = parse_opt,
918
863
.args_doc = "",
919
864
.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){
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
923
868
fprintf(stderr, "Unknown error while parsing arguments\n");
924
869
exitcode = EXIT_FAILURE;
925
870
goto end;
926
871
}
927
872
}
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
}
928
896
929
897
/* If the interface is down, bring it up */
930
898
{
934
902
exitcode = EXIT_FAILURE;
935
903
goto end;
936
904
}
937
strcpy(network.ifr_name, interface);
905
strcpy(network.ifr_name, interface); /* Spurious warning */
938
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
907
if(ret == -1){
940
908
perror("ioctl SIOCGIFFLAGS");
950
918
goto end;
951
919
}
952
920
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
921
close(sd);
957
922
}
958
923
959
924
uid = getuid();
960
925
gid = getgid();
961
926
962
927
ret = setuid(uid);
963
if(ret == -1){
928
if (ret == -1){
964
929
perror("setuid");
965
930
}
966
931
967
932
setgid(gid);
968
if(ret == -1){
933
if (ret == -1){
969
934
perror("setgid");
970
935
}
971
936
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
937
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
938
if(if_index == 0){
997
939
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1007
949
exitcode = EXIT_FAILURE;
1008
950
goto end;
1009
951
}
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");
952
errno = 0;
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
perror("Bad port number");
1015
956
exitcode = EXIT_FAILURE;
1016
957
goto end;
1017
958
}
1018
port = (uint16_t)tmpmax;
1019
959
*address = '\0';
1020
960
address = connect_to;
1021
961
ret = start_mandos_communication(address, port, if_index, &mc);
1027
967
goto end;
1028
968
}
1029
969
1030
if(not debug){
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