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- Committer: Teddy Hogeborn
- Date: 2008-08-10 17:52:54 UTC
- Revision ID: teddy@fukt.bsnet.se-20080810175254-pxjzwws523ji49n7
* Makefile (DOCBOOKTOMAN): Do not generate AUTHORS section.
- 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, SCNu16 */
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 */
369
if(ret == NULL)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
370
307
ret = "(unknown)";
371
308
return ret;
372
309
}
378
315
}
379
316
380
317
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
318
const char *pubkeyfile,
319
const char *seckeyfile){
383
320
int ret;
384
321
385
322
if(debug){
387
324
}
388
325
389
326
ret = gnutls_global_init();
390
if(ret != GNUTLS_E_SUCCESS) {
391
fprintf(stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
393
330
return -1;
394
331
}
395
332
396
if(debug){
333
if (debug){
397
334
/* "Use a log level over 10 to enable all debugging options."
398
335
* - GnuTLS manual
399
336
*/
403
340
404
341
/* OpenPGP credentials */
405
342
gnutls_certificate_allocate_credentials(&mc->cred);
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();
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
411
347
return -1;
412
348
}
413
349
414
350
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
353
seckeyfile);
418
354
}
419
355
420
356
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
423
if(ret != GNUTLS_E_SUCCESS) {
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
424
359
fprintf(stderr,
425
360
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
428
363
safer_gnutls_strerror(ret));
429
364
goto globalfail;
430
365
}
431
366
432
367
/* GnuTLS server initialization */
433
368
ret = gnutls_dh_params_init(&mc->dh_params);
434
if(ret != GNUTLS_E_SUCCESS) {
435
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
436
" %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));
437
372
goto globalfail;
438
373
}
439
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if(ret != GNUTLS_E_SUCCESS) {
441
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
442
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));
443
378
goto globalfail;
444
379
}
445
380
446
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
447
382
448
383
return 0;
449
384
450
385
globalfail:
451
386
452
387
gnutls_certificate_free_credentials(mc->cred);
453
388
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
455
389
return -1;
390
456
391
}
457
392
458
393
static int init_gnutls_session(mandos_context *mc,
460
395
int ret;
461
396
/* GnuTLS session creation */
462
397
ret = gnutls_init(session, GNUTLS_SERVER);
463
if(ret != GNUTLS_E_SUCCESS){
398
if (ret != GNUTLS_E_SUCCESS){
464
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
400
safer_gnutls_strerror(ret));
466
401
}
468
403
{
469
404
const char *err;
470
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if(ret != GNUTLS_E_SUCCESS) {
406
if (ret != GNUTLS_E_SUCCESS) {
472
407
fprintf(stderr, "Syntax error at: %s\n", err);
473
408
fprintf(stderr, "GnuTLS error: %s\n",
474
409
safer_gnutls_strerror(ret));
475
gnutls_deinit(*session);
410
gnutls_deinit (*session);
476
411
return -1;
477
412
}
478
413
}
479
414
480
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
416
mc->cred);
482
if(ret != GNUTLS_E_SUCCESS) {
417
if (ret != GNUTLS_E_SUCCESS) {
483
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
419
safer_gnutls_strerror(ret));
485
gnutls_deinit(*session);
420
gnutls_deinit (*session);
486
421
return -1;
487
422
}
488
423
489
424
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request(*session,
491
GNUTLS_CERT_IGNORE);
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
492
427
493
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
494
429
495
430
return 0;
496
431
}
504
439
AvahiIfIndex if_index,
505
440
mandos_context *mc){
506
441
int ret, tcp_sd;
507
ssize_t sret;
508
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
509
443
char *buffer = NULL;
510
444
char *decrypted_buffer;
516
450
char interface[IF_NAMESIZE];
517
451
gnutls_session_t session;
518
452
519
ret = init_gnutls_session(mc, &session);
520
if(ret != 0){
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
521
455
return -1;
522
456
}
523
457
531
465
perror("socket");
532
466
return -1;
533
467
}
534
468
535
469
if(debug){
536
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
537
471
perror("if_indextoname");
540
474
fprintf(stderr, "Binding to interface %s\n", interface);
541
475
}
542
476
543
memset(&to, 0, sizeof(to));
477
memset(&to,0,sizeof(to)); /* Spurious warning */
544
478
to.in6.sin6_family = AF_INET6;
545
479
/* It would be nice to have a way to detect if we were passed an
546
480
IPv4 address here. Now we assume an IPv6 address. */
547
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
548
if(ret < 0 ){
482
if (ret < 0 ){
549
483
perror("inet_pton");
550
484
return -1;
551
485
}
553
487
fprintf(stderr, "Bad address: %s\n", ip);
554
488
return -1;
555
489
}
556
to.in6.sin6_port = htons(port); /* Spurious warning */
490
to.in6.sin6_port = htons(port); /* Spurious warning */
557
491
558
492
to.in6.sin6_scope_id = (uint32_t)if_index;
559
493
572
506
}
573
507
574
508
ret = connect(tcp_sd, &to.in, sizeof(to));
575
if(ret < 0){
509
if (ret < 0){
576
510
perror("connect");
577
511
return -1;
578
512
}
579
513
580
514
const char *out = mandos_protocol_version;
581
515
written = 0;
582
while(true){
516
while (true){
583
517
size_t out_size = strlen(out);
584
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
585
519
out_size - written));
586
if(ret == -1){
520
if (ret == -1){
587
521
perror("write");
588
522
retval = -1;
589
523
goto mandos_end;
592
526
if(written < out_size){
593
527
continue;
594
528
} else {
595
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
596
530
written = 0;
597
531
out = "\r\n";
598
532
} else {
600
534
}
601
535
}
602
536
}
603
537
604
538
if(debug){
605
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
606
540
}
607
541
608
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
609
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
610
544
do{
611
ret = gnutls_handshake(session);
545
ret = gnutls_handshake (session);
612
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
613
547
614
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
615
549
if(debug){
616
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
617
gnutls_perror(ret);
551
gnutls_perror (ret);
618
552
}
619
553
retval = -1;
620
554
goto mandos_end;
626
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
627
561
ip);
628
562
}
629
563
630
564
while(true){
631
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
632
566
buffer_capacity);
633
if(buffer_capacity == 0){
567
if (buffer_capacity == 0){
634
568
perror("adjustbuffer");
635
569
retval = -1;
636
570
goto mandos_end;
637
571
}
638
572
639
sret = gnutls_record_recv(session, buffer+buffer_length,
640
BUFFER_SIZE);
641
if(sret == 0){
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
642
576
break;
643
577
}
644
if(sret < 0){
645
switch(sret){
578
if (ret < 0){
579
switch(ret){
646
580
case GNUTLS_E_INTERRUPTED:
647
581
case GNUTLS_E_AGAIN:
648
582
break;
649
583
case GNUTLS_E_REHANDSHAKE:
650
584
do{
651
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
652
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
653
if(ret < 0){
587
if (ret < 0){
654
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
655
gnutls_perror(ret);
589
gnutls_perror (ret);
656
590
retval = -1;
657
591
goto mandos_end;
658
592
}
661
595
fprintf(stderr, "Unknown error while reading data from"
662
596
" encrypted session with Mandos server\n");
663
597
retval = -1;
664
gnutls_bye(session, GNUTLS_SHUT_RDWR);
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
665
599
goto mandos_end;
666
600
}
667
601
} else {
668
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
669
603
}
670
604
}
671
605
673
607
fprintf(stderr, "Closing TLS session\n");
674
608
}
675
609
676
gnutls_bye(session, GNUTLS_SHUT_RDWR);
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
677
611
678
if(buffer_length > 0){
679
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
680
614
buffer_length,
681
&decrypted_buffer);
682
if(decrypted_buffer_size >= 0){
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
683
618
written = 0;
684
619
while(written < (size_t) decrypted_buffer_size){
685
ret = (int)fwrite(decrypted_buffer + written, 1,
686
(size_t)decrypted_buffer_size - written,
687
stdout);
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
688
623
if(ret == 0 and ferror(stdout)){
689
624
if(debug){
690
625
fprintf(stderr, "Error writing encrypted data: %s\n",
699
634
} else {
700
635
retval = -1;
701
636
}
702
} else {
703
retval = -1;
704
637
}
705
638
706
639
/* Shutdown procedure */
707
640
708
641
mandos_end:
709
642
free(buffer);
710
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
711
if(ret == -1){
712
perror("close");
713
}
714
gnutls_deinit(session);
643
close(tcp_sd);
644
gnutls_deinit (session);
715
645
return retval;
716
646
}
717
647
730
660
flags,
731
661
void* userdata) {
732
662
mandos_context *mc = userdata;
733
assert(r);
663
assert(r); /* Spurious warning */
734
664
735
665
/* Called whenever a service has been resolved successfully or
736
666
timed out */
737
667
738
switch(event) {
668
switch (event) {
739
669
default:
740
670
case AVAHI_RESOLVER_FAILURE:
741
671
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
753
683
interface, port);
754
684
}
755
685
int ret = start_mandos_communication(ip, port, interface, mc);
756
if(ret == 0){
757
avahi_simple_poll_quit(mc->simple_poll);
686
if (ret == 0){
687
exit(EXIT_SUCCESS);
758
688
}
759
689
}
760
690
}
772
702
flags,
773
703
void* userdata) {
774
704
mandos_context *mc = userdata;
775
assert(b);
705
assert(b); /* Spurious warning */
776
706
777
707
/* Called whenever a new services becomes available on the LAN or
778
708
is removed from the LAN */
779
709
780
switch(event) {
710
switch (event) {
781
711
default:
782
712
case AVAHI_BROWSER_FAILURE:
783
713
792
722
the callback function is called the Avahi server will free the
793
723
resolver for us. */
794
724
795
if(!(avahi_s_service_resolver_new(mc->server, interface,
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
796
726
protocol, name, type, domain,
797
727
AVAHI_PROTO_INET6, 0,
798
728
resolve_callback, mc)))
812
742
}
813
743
}
814
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
815
766
int main(int argc, char *argv[]){
816
767
AvahiSServiceBrowser *sb = NULL;
817
768
int error;
823
774
uid_t uid;
824
775
gid_t gid;
825
776
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
827
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
830
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
831
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
832
.dh_bits = 1024, .priority = "SECURE256"
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
781
.dh_bits = 1024, .priority = "SECURE256"};
834
782
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
836
783
837
784
{
838
785
struct argp_option options[] = {
839
786
{ .name = "debug", .key = 128,
840
787
.doc = "Debug mode", .group = 3 },
841
788
{ .name = "connect", .key = 'c',
842
.arg = "ADDRESS:PORT",
843
.doc = "Connect directly to a specific Mandos server",
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
844
791
.group = 1 },
845
792
{ .name = "interface", .key = 'i',
846
.arg = "NAME",
847
.doc = "Interface that will be used to search for Mandos"
848
" 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",
849
799
.group = 1 },
850
800
{ .name = "seckey", .key = 's',
851
.arg = "FILE",
852
.doc = "OpenPGP secret key file base name",
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
853
803
.group = 1 },
854
804
{ .name = "pubkey", .key = 'p',
855
.arg = "FILE",
856
.doc = "OpenPGP public key file base name",
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
857
807
.group = 2 },
858
808
{ .name = "dh-bits", .key = 129,
859
809
.arg = "BITS",
860
.doc = "Bit length of the prime number used in the"
861
" Diffie-Hellman key exchange",
810
.doc = "dh-bits to use in gnutls communication",
862
811
.group = 2 },
863
812
{ .name = "priority", .key = 130,
864
.arg = "STRING",
865
.doc = "GnuTLS priority string for the TLS handshake",
866
.group = 1 },
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
867
815
{ .name = NULL }
868
816
};
817
869
818
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
872
switch(key) {
873
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:
874
825
debug = true;
875
826
break;
876
case 'c': /* --connect */
827
case 'c':
877
828
connect_to = arg;
878
829
break;
879
case 'i': /* --interface */
830
case 'i':
880
831
interface = arg;
881
832
break;
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");
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");
892
847
exit(EXIT_FAILURE);
893
848
}
894
849
break;
895
case 130: /* --priority */
850
case 130:
896
851
mc.priority = arg;
897
852
break;
898
853
case ARGP_KEY_ARG:
899
argp_usage(state);
900
case ARGP_KEY_END:
854
argp_usage (state);
901
855
break;
856
case ARGP_KEY_END:
857
break;
902
858
default:
903
859
return ARGP_ERR_UNKNOWN;
904
860
}
905
861
return 0;
906
862
}
907
863
908
864
struct argp argp = { .options = options, .parser = parse_opt,
909
865
.args_doc = "",
910
866
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
920
/* If the interface is down, bring it up */
921
{
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
if(sd < 0) {
924
perror("socket");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
if(ret == -1){
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
933
goto end;
934
}
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
if(ret == -1){
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
941
goto end;
942
}
943
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
948
}
949
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
950
897
uid = getuid();
951
898
gid = getgid();
952
899
953
900
ret = setuid(uid);
954
if(ret == -1){
901
if (ret == -1){
955
902
perror("setuid");
956
903
}
957
904
958
905
setgid(gid);
959
if(ret == -1){
906
if (ret == -1){
960
907
perror("setgid");
961
908
}
962
909
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
986
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
911
if(if_index == 0){
988
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
998
922
exitcode = EXIT_FAILURE;
999
923
goto end;
1000
924
}
1001
uint16_t port;
1002
ret = sscanf(address+1, "%" SCNu16, &port);
1003
if(ret != 1){
1004
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");
1005
929
exitcode = EXIT_FAILURE;
1006
930
goto end;
1007
931
}
1016
940
goto end;
1017
941
}
1018
942
1019
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){
1020
971
avahi_set_log_function(empty_log);
1021
972
}
1022
973
1025
976
1026
977
/* Allocate main Avahi loop object */
1027
978
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL) {
979
if (mc.simple_poll == NULL) {
1029
980
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
981
" object.\n");
1031
982
exitcode = EXIT_FAILURE;
1032
983
goto end;
1033
984
}
1034
985
1035
986
{
1036
987
AvahiServerConfig config;
1037
988
/* Do not publish any local Zeroconf records */
1040
991
config.publish_addresses = 0;
1041
992
config.publish_workstation = 0;
1042
993
config.publish_domain = 0;
1043
994
1044
995
/* Allocate a new server */
1045
996
mc.server = avahi_server_new(avahi_simple_poll_get
1046
997
(mc.simple_poll), &config, NULL,
1047
998
NULL, &error);
1048
999
1049
1000
/* Free the Avahi configuration data */
1050
1001
avahi_server_config_free(&config);
1051
1002
}
1052
1003
1053
1004
/* Check if creating the Avahi server object succeeded */
1054
if(mc.server == NULL) {
1005
if (mc.server == NULL) {
1055
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
1007
avahi_strerror(error));
1057
1008
exitcode = EXIT_FAILURE;
1063
1014
AVAHI_PROTO_INET6,
1064
1015
"_mandos._tcp", NULL, 0,
1065
1016
browse_callback, &mc);
1066
if(sb == NULL) {
1017
if (sb == NULL) {
1067
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1068
1019
avahi_strerror(avahi_server_errno(mc.server)));
1069
1020
exitcode = EXIT_FAILURE;
1071
1022
}
1072
1023
1073
1024
/* Run the main loop */
1074
1075
if(debug){
1025
1026
if (debug){
1076
1027
fprintf(stderr, "Starting Avahi loop search\n");
1077
1028
}
1078
1029
1079
1030
avahi_simple_poll_loop(mc.simple_poll);
1080
1031
1081
1032
end:
1082
1083
if(debug){
1033
1034
if (debug){
1084
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1085
1036
}
1086
1037
1087
1038
/* Cleanup things */
1088
if(sb != NULL)
1039
if (sb != NULL)
1089
1040
avahi_s_service_browser_free(sb);
1090
1041
1091
if(mc.server != NULL)
1042
if (mc.server != NULL)
1092
1043
avahi_server_free(mc.server);
1093
1094
if(mc.simple_poll != NULL)
1044
1045
if (mc.simple_poll != NULL)
1095
1046
avahi_simple_poll_free(mc.simple_poll);
1096
1097
if(gnutls_initalized){
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1098
1051
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
if(errno != ENOENT){
1114
perror("opendir");
1115
}
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if(direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1 and errno != ENOENT){
1142
perror("rmdir");
1143
}
1144
}
1145
1052
gnutls_global_deinit ();
1053
}
1054
1146
1055
return exitcode;
1147
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0