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- Committer: Teddy Hogeborn
- Date: 2009-01-26 23:47:44 UTC
- Revision ID: teddy@fukt.bsnet.se-20090126234744-c19lb7zn1qsrcwmv
* debian/control (mandos/Depends): Added "python-gobject".
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
39
41
#include <stdint.h> /* uint16_t, uint32_t */
40
42
#include <stddef.h> /* NULL, size_t, ssize_t */
41
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
44
srand() */
43
45
#include <stdbool.h> /* bool, true */
44
46
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
47
strerror(), asprintf(), strcpy() */
46
48
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
49
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
50
sockaddr_in6, PF_INET6,
51
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
53
#include <inttypes.h> /* PRIu16 */
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
54
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
56
struct in6_addr, inet_pton(),
56
57
connect() */
58
#include <fcntl.h> /* open() */
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
57
62
#include <assert.h> /* assert() */
58
63
#include <errno.h> /* perror(), errno */
59
64
#include <time.h> /* time() */
60
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
61
66
SIOCSIFFLAGS, if_indextoname(),
62
67
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
63
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
64
70
getuid(), getgid(), setuid(),
65
71
setgid() */
66
#include <netinet/in.h>
67
72
#include <arpa/inet.h> /* inet_pton(), htons */
68
#include <iso646.h> /* not, and */
73
#include <iso646.h> /* not, and, or */
69
74
#include <argp.h> /* struct argp_option, error_t, struct
70
75
argp_state, struct argp,
71
76
argp_parse(), ARGP_KEY_ARG,
83
88
#include <avahi-common/error.h>
84
89
85
90
/* GnuTLS */
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
91
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
92
functions:
87
93
gnutls_*
88
94
init_gnutls_session(),
89
95
GNUTLS_* */
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
96
#include <gnutls/openpgp.h>
97
/* gnutls_certificate_set_openpgp_key_file(),
91
98
GNUTLS_OPENPGP_FMT_BASE64 */
92
99
93
100
/* GPGME */
94
#include <gpgme.h> /* All GPGME types, constants and functions
101
#include <gpgme.h> /* All GPGME types, constants and
102
functions:
95
103
gpgme_*
96
104
GPGME_PROTOCOL_OpenPGP,
97
105
GPG_ERR_NO_* */
98
106
99
107
#define BUFFER_SIZE 256
100
108
109
#define PATHDIR "/conf/conf.d/mandos"
110
#define SECKEY "seckey.txt"
111
#define PUBKEY "pubkey.txt"
112
101
113
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
114
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
115
const char *argp_program_version = "mandos-client " VERSION;
105
116
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
117
107
118
/* Used for passing in values through the Avahi callback functions */
112
123
unsigned int dh_bits;
113
124
gnutls_dh_params_t dh_params;
114
125
const char *priority;
126
gpgme_ctx_t ctx;
115
127
} mandos_context;
116
128
117
129
/*
121
133
*/
122
134
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
135
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
137
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
138
if(buffer == NULL){
127
139
return 0;
128
140
}
129
141
buffer_capacity += BUFFER_SIZE;
132
144
}
133
145
134
146
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
147
* Initialize GPGME.
137
148
*/
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;
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
150
const char *pubkey, const char *tempdir){
151
int ret;
144
152
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
153
gpgme_engine_info_t engine_info;
149
154
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
155
156
/*
157
* Helper function to insert pub and seckey to the enigne keyring.
158
*/
159
bool import_key(const char *filename){
160
int fd;
161
gpgme_data_t pgp_data;
162
163
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
164
if(fd == -1){
165
perror("open");
166
return false;
167
}
168
169
rc = gpgme_data_new_from_fd(&pgp_data, fd);
170
if(rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
return false;
174
}
175
176
rc = gpgme_op_import(mc->ctx, pgp_data);
177
if(rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
return false;
181
}
182
183
ret = (int)TEMP_FAILURE_RETRY(close(fd));
184
if(ret == -1){
185
perror("close");
186
}
187
gpgme_data_release(pgp_data);
188
return true;
189
}
190
191
if(debug){
192
fprintf(stderr, "Initialize gpgme\n");
152
193
}
153
194
154
195
/* Init GPGME */
155
196
gpgme_check_version(NULL);
156
197
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
198
if(rc != GPG_ERR_NO_ERROR){
158
199
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
200
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
201
return false;
161
202
}
162
203
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){
204
/* Set GPGME home directory for the OpenPGP engine only */
205
rc = gpgme_get_engine_info(&engine_info);
206
if(rc != GPG_ERR_NO_ERROR){
166
207
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
208
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
209
return false;
169
210
}
170
211
while(engine_info != NULL){
171
212
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
213
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
214
engine_info->file_name, tempdir);
174
215
break;
175
216
}
176
217
engine_info = engine_info->next;
177
218
}
178
219
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
220
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
221
return false;
222
}
223
224
/* Create new GPGME "context" */
225
rc = gpgme_new(&(mc->ctx));
226
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_new: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
229
return false;
230
}
231
232
if(not import_key(pubkey) or not import_key(seckey)){
233
return false;
234
}
235
236
return true;
237
}
238
239
/*
240
* Decrypt OpenPGP data.
241
* Returns -1 on error
242
*/
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
245
size_t crypto_size,
246
char **plaintext){
247
gpgme_data_t dh_crypto, dh_plain;
248
gpgme_error_t rc;
249
ssize_t ret;
250
size_t plaintext_capacity = 0;
251
ssize_t plaintext_length = 0;
252
253
if(debug){
254
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
255
}
182
256
183
257
/* Create new GPGME data buffer from memory cryptotext */
184
258
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
259
0);
186
if (rc != GPG_ERR_NO_ERROR){
260
if(rc != GPG_ERR_NO_ERROR){
187
261
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
262
gpgme_strsource(rc), gpgme_strerror(rc));
189
263
return -1;
191
265
192
266
/* Create new empty GPGME data buffer for the plaintext */
193
267
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
268
if(rc != GPG_ERR_NO_ERROR){
195
269
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
270
gpgme_strsource(rc), gpgme_strerror(rc));
197
271
gpgme_data_release(dh_crypto);
198
272
return -1;
199
273
}
200
274
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
210
275
/* Decrypt data from the cryptotext data buffer to the plaintext
211
276
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
278
if(rc != GPG_ERR_NO_ERROR){
214
279
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
280
gpgme_strsource(rc), gpgme_strerror(rc));
216
281
plaintext_length = -1;
282
if(debug){
283
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
285
if(result == NULL){
286
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
287
} else {
288
fprintf(stderr, "Unsupported algorithm: %s\n",
289
result->unsupported_algorithm);
290
fprintf(stderr, "Wrong key usage: %u\n",
291
result->wrong_key_usage);
292
if(result->file_name != NULL){
293
fprintf(stderr, "File name: %s\n", result->file_name);
294
}
295
gpgme_recipient_t recipient;
296
recipient = result->recipients;
297
if(recipient){
298
while(recipient != NULL){
299
fprintf(stderr, "Public key algorithm: %s\n",
300
gpgme_pubkey_algo_name(recipient->pubkey_algo));
301
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
302
fprintf(stderr, "Secret key available: %s\n",
303
recipient->status == GPG_ERR_NO_SECKEY
304
? "No" : "Yes");
305
recipient = recipient->next;
306
}
307
}
308
}
309
}
217
310
goto decrypt_end;
218
311
}
219
312
221
314
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
315
}
223
316
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
253
317
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
318
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
319
perror("gpgme_data_seek");
256
320
plaintext_length = -1;
257
321
goto decrypt_end;
258
322
}
262
326
plaintext_capacity = adjustbuffer(plaintext,
263
327
(size_t)plaintext_length,
264
328
plaintext_capacity);
265
if (plaintext_capacity == 0){
329
if(plaintext_capacity == 0){
266
330
perror("adjustbuffer");
267
331
plaintext_length = -1;
268
332
goto decrypt_end;
271
335
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
336
BUFFER_SIZE);
273
337
/* Print the data, if any */
274
if (ret == 0){
338
if(ret == 0){
275
339
/* EOF */
276
340
break;
277
341
}
282
346
}
283
347
plaintext_length += ret;
284
348
}
285
349
286
350
if(debug){
287
351
fprintf(stderr, "Decrypted password is: ");
288
352
for(ssize_t i = 0; i < plaintext_length; i++){
301
365
return plaintext_length;
302
366
}
303
367
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
368
static const char * safer_gnutls_strerror(int value) {
369
const char *ret = gnutls_strerror(value); /* Spurious warning from
370
-Wunreachable-code */
371
if(ret == NULL)
307
372
ret = "(unknown)";
308
373
return ret;
309
374
}
315
380
}
316
381
317
382
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfile,
319
const char *seckeyfile){
383
const char *pubkeyfilename,
384
const char *seckeyfilename){
320
385
int ret;
321
386
322
387
if(debug){
324
389
}
325
390
326
391
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
392
if(ret != GNUTLS_E_SUCCESS) {
393
fprintf(stderr, "GnuTLS global_init: %s\n",
394
safer_gnutls_strerror(ret));
330
395
return -1;
331
396
}
332
397
333
if (debug){
398
if(debug){
334
399
/* "Use a log level over 10 to enable all debugging options."
335
400
* - GnuTLS manual
336
401
*/
340
405
341
406
/* OpenPGP credentials */
342
407
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
408
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
410
* from
411
* -Wunreachable-code
412
*/
413
safer_gnutls_strerror(ret));
414
gnutls_global_deinit();
347
415
return -1;
348
416
}
349
417
350
418
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
353
seckeyfile);
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
421
seckeyfilename);
354
422
}
355
423
356
424
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
425
(mc->cred, pubkeyfilename, seckeyfilename,
426
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
359
428
fprintf(stderr,
360
429
"Error[%d] while reading the OpenPGP key pair ('%s',"
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
430
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
fprintf(stderr, "The GnuTLS error is: %s\n",
363
432
safer_gnutls_strerror(ret));
364
433
goto globalfail;
365
434
}
366
435
367
436
/* GnuTLS server initialization */
368
437
ret = gnutls_dh_params_init(&mc->dh_params);
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
438
if(ret != GNUTLS_E_SUCCESS) {
439
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
" %s\n", safer_gnutls_strerror(ret));
372
441
goto globalfail;
373
442
}
374
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
444
if(ret != GNUTLS_E_SUCCESS) {
445
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
safer_gnutls_strerror(ret));
378
447
goto globalfail;
379
448
}
380
449
381
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
382
451
383
452
return 0;
384
453
385
454
globalfail:
386
455
387
456
gnutls_certificate_free_credentials(mc->cred);
388
457
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
389
459
return -1;
390
391
460
}
392
461
393
462
static int init_gnutls_session(mandos_context *mc,
395
464
int ret;
396
465
/* GnuTLS session creation */
397
466
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
467
if(ret != GNUTLS_E_SUCCESS){
399
468
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
469
safer_gnutls_strerror(ret));
401
470
}
403
472
{
404
473
const char *err;
405
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
475
if(ret != GNUTLS_E_SUCCESS) {
407
476
fprintf(stderr, "Syntax error at: %s\n", err);
408
477
fprintf(stderr, "GnuTLS error: %s\n",
409
478
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
479
gnutls_deinit(*session);
411
480
return -1;
412
481
}
413
482
}
414
483
415
484
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
485
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
486
if(ret != GNUTLS_E_SUCCESS) {
418
487
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
488
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
489
gnutls_deinit(*session);
421
490
return -1;
422
491
}
423
492
424
493
/* ignore client certificate if any. */
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
427
496
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
498
430
499
return 0;
431
500
}
439
508
AvahiIfIndex if_index,
440
509
mandos_context *mc){
441
510
int ret, tcp_sd;
511
ssize_t sret;
442
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
443
513
char *buffer = NULL;
444
514
char *decrypted_buffer;
450
520
char interface[IF_NAMESIZE];
451
521
gnutls_session_t session;
452
522
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
523
ret = init_gnutls_session(mc, &session);
524
if(ret != 0){
455
525
return -1;
456
526
}
457
527
465
535
perror("socket");
466
536
return -1;
467
537
}
468
538
469
539
if(debug){
470
540
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
541
perror("if_indextoname");
474
544
fprintf(stderr, "Binding to interface %s\n", interface);
475
545
}
476
546
477
memset(&to,0,sizeof(to)); /* Spurious warning */
547
memset(&to, 0, sizeof(to));
478
548
to.in6.sin6_family = AF_INET6;
479
549
/* It would be nice to have a way to detect if we were passed an
480
550
IPv4 address here. Now we assume an IPv6 address. */
481
551
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
552
if(ret < 0 ){
483
553
perror("inet_pton");
484
554
return -1;
485
555
}
487
557
fprintf(stderr, "Bad address: %s\n", ip);
488
558
return -1;
489
559
}
490
to.in6.sin6_port = htons(port); /* Spurious warning */
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
561
-Wconversion and
562
-Wunreachable-code */
491
563
492
564
to.in6.sin6_scope_id = (uint32_t)if_index;
493
565
506
578
}
507
579
508
580
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
581
if(ret < 0){
510
582
perror("connect");
511
583
return -1;
512
584
}
513
585
514
586
const char *out = mandos_protocol_version;
515
587
written = 0;
516
while (true){
588
while(true){
517
589
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
591
out_size - written));
520
if (ret == -1){
592
if(ret == -1){
521
593
perror("write");
522
594
retval = -1;
523
595
goto mandos_end;
526
598
if(written < out_size){
527
599
continue;
528
600
} else {
529
if (out == mandos_protocol_version){
601
if(out == mandos_protocol_version){
530
602
written = 0;
531
603
out = "\r\n";
532
604
} else {
534
606
}
535
607
}
536
608
}
537
609
538
610
if(debug){
539
611
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
612
}
541
613
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
544
616
do{
545
ret = gnutls_handshake (session);
617
ret = gnutls_handshake(session);
546
618
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
547
619
548
if (ret != GNUTLS_E_SUCCESS){
620
if(ret != GNUTLS_E_SUCCESS){
549
621
if(debug){
550
622
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
551
gnutls_perror (ret);
623
gnutls_perror(ret);
552
624
}
553
625
retval = -1;
554
626
goto mandos_end;
560
632
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
561
633
ip);
562
634
}
563
635
564
636
while(true){
565
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
566
638
buffer_capacity);
567
if (buffer_capacity == 0){
639
if(buffer_capacity == 0){
568
640
perror("adjustbuffer");
569
641
retval = -1;
570
642
goto mandos_end;
571
643
}
572
644
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
645
sret = gnutls_record_recv(session, buffer+buffer_length,
646
BUFFER_SIZE);
647
if(sret == 0){
576
648
break;
577
649
}
578
if (ret < 0){
579
switch(ret){
650
if(sret < 0){
651
switch(sret){
580
652
case GNUTLS_E_INTERRUPTED:
581
653
case GNUTLS_E_AGAIN:
582
654
break;
583
655
case GNUTLS_E_REHANDSHAKE:
584
656
do{
585
ret = gnutls_handshake (session);
657
ret = gnutls_handshake(session);
586
658
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
587
if (ret < 0){
659
if(ret < 0){
588
660
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
589
gnutls_perror (ret);
661
gnutls_perror(ret);
590
662
retval = -1;
591
663
goto mandos_end;
592
664
}
595
667
fprintf(stderr, "Unknown error while reading data from"
596
668
" encrypted session with Mandos server\n");
597
669
retval = -1;
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
671
goto mandos_end;
600
672
}
601
673
} else {
602
buffer_length += (size_t) ret;
674
buffer_length += (size_t) sret;
603
675
}
604
676
}
605
677
607
679
fprintf(stderr, "Closing TLS session\n");
608
680
}
609
681
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
683
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
684
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
614
686
buffer_length,
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
687
&decrypted_buffer);
688
if(decrypted_buffer_size >= 0){
618
689
written = 0;
619
690
while(written < (size_t) decrypted_buffer_size){
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
691
ret = (int)fwrite(decrypted_buffer + written, 1,
692
(size_t)decrypted_buffer_size - written,
693
stdout);
623
694
if(ret == 0 and ferror(stdout)){
624
695
if(debug){
625
696
fprintf(stderr, "Error writing encrypted data: %s\n",
634
705
} else {
635
706
retval = -1;
636
707
}
708
} else {
709
retval = -1;
637
710
}
638
711
639
712
/* Shutdown procedure */
640
713
641
714
mandos_end:
642
715
free(buffer);
643
close(tcp_sd);
644
gnutls_deinit (session);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
719
}
720
gnutls_deinit(session);
645
721
return retval;
646
722
}
647
723
660
736
flags,
661
737
void* userdata) {
662
738
mandos_context *mc = userdata;
663
assert(r); /* Spurious warning */
739
assert(r);
664
740
665
741
/* Called whenever a service has been resolved successfully or
666
742
timed out */
667
743
668
switch (event) {
744
switch(event) {
669
745
default:
670
746
case AVAHI_RESOLVER_FAILURE:
671
747
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
679
755
avahi_address_snprint(ip, sizeof(ip), address);
680
756
if(debug){
681
757
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
682
PRIu16 ") on port %d\n", name, host_name, ip,
683
interface, port);
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
ip, (intmax_t)interface, port);
684
760
}
685
761
int ret = start_mandos_communication(ip, port, interface, mc);
686
if (ret == 0){
687
exit(EXIT_SUCCESS);
762
if(ret == 0){
763
avahi_simple_poll_quit(mc->simple_poll);
688
764
}
689
765
}
690
766
}
702
778
flags,
703
779
void* userdata) {
704
780
mandos_context *mc = userdata;
705
assert(b); /* Spurious warning */
781
assert(b);
706
782
707
783
/* Called whenever a new services becomes available on the LAN or
708
784
is removed from the LAN */
709
785
710
switch (event) {
786
switch(event) {
711
787
default:
712
788
case AVAHI_BROWSER_FAILURE:
713
789
722
798
the callback function is called the Avahi server will free the
723
799
resolver for us. */
724
800
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
726
802
protocol, name, type, domain,
727
803
AVAHI_PROTO_INET6, 0,
728
804
resolve_callback, mc)))
742
818
}
743
819
}
744
820
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
766
821
int main(int argc, char *argv[]){
767
822
AvahiSServiceBrowser *sb = NULL;
768
823
int error;
769
824
int ret;
825
intmax_t tmpmax;
826
int numchars;
770
827
int exitcode = EXIT_SUCCESS;
771
828
const char *interface = "eth0";
772
829
struct ifreq network;
774
831
uid_t uid;
775
832
gid_t gid;
776
833
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
777
835
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
838
780
839
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
840
.dh_bits = 1024, .priority = "SECURE256"
841
":!CTYPE-X.509:+CTYPE-OPENPGP" };
842
bool gnutls_initialized = false;
843
bool gpgme_initialized = false;
783
844
784
845
{
785
846
struct argp_option options[] = {
786
847
{ .name = "debug", .key = 128,
787
848
.doc = "Debug mode", .group = 3 },
788
849
{ .name = "connect", .key = 'c',
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
850
.arg = "ADDRESS:PORT",
851
.doc = "Connect directly to a specific Mandos server",
791
852
.group = 1 },
792
853
{ .name = "interface", .key = 'i',
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",
854
.arg = "NAME",
855
.doc = "Interface that will be used to search for Mandos"
856
" servers",
799
857
.group = 1 },
800
858
{ .name = "seckey", .key = 's',
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
859
.arg = "FILE",
860
.doc = "OpenPGP secret key file base name",
803
861
.group = 1 },
804
862
{ .name = "pubkey", .key = 'p',
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
863
.arg = "FILE",
864
.doc = "OpenPGP public key file base name",
807
865
.group = 2 },
808
866
{ .name = "dh-bits", .key = 129,
809
867
.arg = "BITS",
810
.doc = "dh-bits to use in gnutls communication",
868
.doc = "Bit length of the prime number used in the"
869
" Diffie-Hellman key exchange",
811
870
.group = 2 },
812
871
{ .name = "priority", .key = 130,
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
872
.arg = "STRING",
873
.doc = "GnuTLS priority string for the TLS handshake",
874
.group = 1 },
815
875
{ .name = NULL }
816
876
};
817
818
877
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:
878
error_t parse_opt(int key, char *arg,
879
struct argp_state *state) {
880
switch(key) {
881
case 128: /* --debug */
825
882
debug = true;
826
883
break;
827
case 'c':
884
case 'c': /* --connect */
828
885
connect_to = arg;
829
886
break;
830
case 'i':
887
case 'i': /* --interface */
831
888
interface = arg;
832
889
break;
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");
890
case 's': /* --seckey */
891
seckey = arg;
892
break;
893
case 'p': /* --pubkey */
894
pubkey = arg;
895
break;
896
case 129: /* --dh-bits */
897
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
898
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
899
or arg[numchars] != '\0'){
900
fprintf(stderr, "Bad number of DH bits\n");
847
901
exit(EXIT_FAILURE);
848
902
}
903
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
849
904
break;
850
case 130:
905
case 130: /* --priority */
851
906
mc.priority = arg;
852
907
break;
853
908
case ARGP_KEY_ARG:
854
argp_usage (state);
909
argp_usage(state);
910
case ARGP_KEY_END:
855
911
break;
856
case ARGP_KEY_END:
857
break;
858
912
default:
859
913
return ARGP_ERR_UNKNOWN;
860
914
}
861
915
return 0;
862
916
}
863
917
864
918
struct argp argp = { .options = options, .parser = parse_opt,
865
919
.args_doc = "",
866
920
.doc = "Mandos client -- Get and decrypt"
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
921
" passwords from a Mandos server" };
922
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
923
if(ret == ARGP_ERR_UNKNOWN){
924
fprintf(stderr, "Unknown error while parsing arguments\n");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
}
929
930
/* If the interface is down, bring it up */
931
{
932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
933
if(sd < 0) {
934
perror("socket");
935
exitcode = EXIT_FAILURE;
936
goto end;
937
}
938
strcpy(network.ifr_name, interface);
939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCGIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
if((network.ifr_flags & IFF_UP) == 0){
946
network.ifr_flags |= IFF_UP;
947
ret = ioctl(sd, SIOCSIFFLAGS, &network);
948
if(ret == -1){
949
perror("ioctl SIOCSIFFLAGS");
950
exitcode = EXIT_FAILURE;
951
goto end;
952
}
953
}
954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
955
if(ret == -1){
956
perror("close");
957
}
958
}
959
897
960
uid = getuid();
898
961
gid = getgid();
899
962
900
963
ret = setuid(uid);
901
if (ret == -1){
964
if(ret == -1){
902
965
perror("setuid");
903
966
}
904
967
905
968
setgid(gid);
906
if (ret == -1){
969
if(ret == -1){
907
970
perror("setgid");
908
971
}
909
972
973
ret = init_gnutls_global(&mc, pubkey, seckey);
974
if(ret == -1){
975
fprintf(stderr, "init_gnutls_global failed\n");
976
exitcode = EXIT_FAILURE;
977
goto end;
978
} else {
979
gnutls_initialized = true;
980
}
981
982
if(mkdtemp(tempdir) == NULL){
983
perror("mkdtemp");
984
tempdir[0] = '\0';
985
goto end;
986
}
987
988
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
989
fprintf(stderr, "init_gpgme failed\n");
990
exitcode = EXIT_FAILURE;
991
goto end;
992
} else {
993
gpgme_initialized = true;
994
}
995
910
996
if_index = (AvahiIfIndex) if_nametoindex(interface);
911
997
if(if_index == 0){
912
998
fprintf(stderr, "No such interface: \"%s\"\n", interface);
922
1008
exitcode = EXIT_FAILURE;
923
1009
goto end;
924
1010
}
925
errno = 0;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
927
if(errno){
928
perror("Bad port number");
1011
uint16_t port;
1012
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1013
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1014
or address[numchars+1] != '\0'){
1015
fprintf(stderr, "Bad port number\n");
929
1016
exitcode = EXIT_FAILURE;
930
1017
goto end;
931
1018
}
1019
port = (uint16_t)tmpmax;
932
1020
*address = '\0';
933
1021
address = connect_to;
934
1022
ret = start_mandos_communication(address, port, if_index, &mc);
940
1028
goto end;
941
1029
}
942
1030
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
if(not debug){
971
1032
avahi_set_log_function(empty_log);
972
1033
}
973
1034
976
1037
977
1038
/* Allocate main Avahi loop object */
978
1039
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
1040
if(mc.simple_poll == NULL) {
980
1041
fprintf(stderr, "Avahi: Failed to create simple poll"
981
1042
" object.\n");
982
1043
exitcode = EXIT_FAILURE;
983
1044
goto end;
984
1045
}
985
1046
986
1047
{
987
1048
AvahiServerConfig config;
988
1049
/* Do not publish any local Zeroconf records */
991
1052
config.publish_addresses = 0;
992
1053
config.publish_workstation = 0;
993
1054
config.publish_domain = 0;
994
1055
995
1056
/* Allocate a new server */
996
1057
mc.server = avahi_server_new(avahi_simple_poll_get
997
1058
(mc.simple_poll), &config, NULL,
998
1059
NULL, &error);
999
1060
1000
1061
/* Free the Avahi configuration data */
1001
1062
avahi_server_config_free(&config);
1002
1063
}
1003
1064
1004
1065
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1066
if(mc.server == NULL) {
1006
1067
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
1068
avahi_strerror(error));
1008
1069
exitcode = EXIT_FAILURE;
1014
1075
AVAHI_PROTO_INET6,
1015
1076
"_mandos._tcp", NULL, 0,
1016
1077
browse_callback, &mc);
1017
if (sb == NULL) {
1078
if(sb == NULL) {
1018
1079
fprintf(stderr, "Failed to create service browser: %s\n",
1019
1080
avahi_strerror(avahi_server_errno(mc.server)));
1020
1081
exitcode = EXIT_FAILURE;
1022
1083
}
1023
1084
1024
1085
/* Run the main loop */
1025
1026
if (debug){
1086
1087
if(debug){
1027
1088
fprintf(stderr, "Starting Avahi loop search\n");
1028
1089
}
1029
1090
1030
1091
avahi_simple_poll_loop(mc.simple_poll);
1031
1092
1032
1093
end:
1033
1034
if (debug){
1094
1095
if(debug){
1035
1096
fprintf(stderr, "%s exiting\n", argv[0]);
1036
1097
}
1037
1098
1038
1099
/* Cleanup things */
1039
if (sb != NULL)
1100
if(sb != NULL)
1040
1101
avahi_s_service_browser_free(sb);
1041
1102
1042
if (mc.server != NULL)
1103
if(mc.server != NULL)
1043
1104
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1105
1106
if(mc.simple_poll != NULL)
1046
1107
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1108
1109
if(gnutls_initialized){
1051
1110
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1111
gnutls_global_deinit();
1112
gnutls_dh_params_deinit(mc.dh_params);
1113
}
1114
1115
if(gpgme_initialized){
1116
gpgme_release(mc.ctx);
1117
}
1118
1119
/* Removes the temp directory used by GPGME */
1120
if(tempdir[0] != '\0'){
1121
DIR *d;
1122
struct dirent *direntry;
1123
d = opendir(tempdir);
1124
if(d == NULL){
1125
if(errno != ENOENT){
1126
perror("opendir");
1127
}
1128
} else {
1129
while(true){
1130
direntry = readdir(d);
1131
if(direntry == NULL){
1132
break;
1133
}
1134
/* Skip "." and ".." */
1135
if(direntry->d_name[0] == '.'
1136
and (direntry->d_name[1] == '\0'
1137
or (direntry->d_name[1] == '.'
1138
and direntry->d_name[2] == '\0'))){
1139
continue;
1140
}
1141
char *fullname = NULL;
1142
ret = asprintf(&fullname, "%s/%s", tempdir,
1143
direntry->d_name);
1144
if(ret < 0){
1145
perror("asprintf");
1146
continue;
1147
}
1148
ret = remove(fullname);
1149
if(ret == -1){
1150
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1151
strerror(errno));
1152
}
1153
free(fullname);
1154
}
1155
closedir(d);
1156
}
1157
ret = rmdir(tempdir);
1158
if(ret == -1 and errno != ENOENT){
1159
perror("rmdir");
1160
}
1053
1161
}
1054
1162
1055
1163
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0