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237.2.34
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-15 05:27:55 UTC
- mfrom: (246 mandos-release)
- mto: (24.1.123 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 249.
- Revision ID: teddy@fukt.bsnet.se-20090115052755-luw0gjx8727p24o3
Merge from release branch.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- 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
35
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
stdout, ferror(), sscanf */
39
40
#include <stdint.h> /* uint16_t, uint32_t */
40
41
#include <stddef.h> /* NULL, size_t, ssize_t */
41
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
49
sockaddr_in6, PF_INET6,
49
50
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
52
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
55
struct in6_addr, inet_pton(),
54
56
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
55
61
#include <assert.h> /* assert() */
56
62
#include <errno.h> /* perror(), errno */
57
63
#include <time.h> /* time() */
58
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
65
SIOCSIFFLAGS, if_indextoname(),
60
66
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
61
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
69
getuid(), getgid(), setuid(),
63
70
setgid() */
64
#include <netinet/in.h>
65
71
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
72
#include <iso646.h> /* not, and, or */
67
73
#include <argp.h> /* struct argp_option, error_t, struct
68
74
argp_state, struct argp,
69
75
argp_parse(), ARGP_KEY_ARG,
86
92
gnutls_*
87
93
init_gnutls_session(),
88
94
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
90
97
GNUTLS_OPENPGP_FMT_BASE64 */
91
98
92
99
/* GPGME */
98
105
99
106
#define BUFFER_SIZE 256
100
107
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
101
112
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
113
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
114
const char *argp_program_version = "mandos-client " VERSION;
105
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
116
107
117
/* Used for passing in values through the Avahi callback functions */
112
122
unsigned int dh_bits;
113
123
gnutls_dh_params_t dh_params;
114
124
const char *priority;
125
gpgme_ctx_t ctx;
115
126
} mandos_context;
116
127
117
128
/*
121
132
*/
122
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
134
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
137
if(buffer == NULL){
127
138
return 0;
128
139
}
129
140
buffer_capacity += BUFFER_SIZE;
132
143
}
133
144
134
145
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
146
* Initialize GPGME.
137
147
*/
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;
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
144
151
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
152
gpgme_engine_info_t engine_info;
149
153
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
154
155
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
157
*/
158
bool import_key(const char *filename){
159
int fd;
160
gpgme_data_t pgp_data;
161
162
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
if(fd == -1){
164
perror("open");
165
return false;
166
}
167
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if(rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if(rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
if(ret == -1){
184
perror("close");
185
}
186
gpgme_data_release(pgp_data);
187
return true;
188
}
189
190
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
152
192
}
153
193
154
194
/* Init GPGME */
155
195
gpgme_check_version(NULL);
156
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
197
if(rc != GPG_ERR_NO_ERROR){
158
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
199
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
200
return false;
161
201
}
162
202
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){
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){
166
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
207
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
208
return false;
169
209
}
170
210
while(engine_info != NULL){
171
211
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
212
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
213
engine_info->file_name, tempdir);
174
214
break;
175
215
}
176
216
engine_info = engine_info->next;
177
217
}
178
218
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
return false;
221
}
222
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if(not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
236
}
237
238
/*
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
241
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
246
gpgme_data_t dh_crypto, dh_plain;
247
gpgme_error_t rc;
248
ssize_t ret;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
251
252
if(debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
254
}
182
255
183
256
/* Create new GPGME data buffer from memory cryptotext */
184
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
258
0);
186
if (rc != GPG_ERR_NO_ERROR){
259
if(rc != GPG_ERR_NO_ERROR){
187
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
261
gpgme_strsource(rc), gpgme_strerror(rc));
189
262
return -1;
191
264
192
265
/* Create new empty GPGME data buffer for the plaintext */
193
266
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
267
if(rc != GPG_ERR_NO_ERROR){
195
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
269
gpgme_strsource(rc), gpgme_strerror(rc));
197
270
gpgme_data_release(dh_crypto);
198
271
return -1;
199
272
}
200
273
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
274
/* Decrypt data from the cryptotext data buffer to the plaintext
211
275
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
214
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
279
gpgme_strsource(rc), gpgme_strerror(rc));
216
280
plaintext_length = -1;
281
if(debug){
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if(result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
293
}
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
306
}
307
}
308
}
217
309
goto decrypt_end;
218
310
}
219
311
221
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
314
}
223
315
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
316
/* 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");
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
256
319
plaintext_length = -1;
257
320
goto decrypt_end;
258
321
}
262
325
plaintext_capacity = adjustbuffer(plaintext,
263
326
(size_t)plaintext_length,
264
327
plaintext_capacity);
265
if (plaintext_capacity == 0){
328
if(plaintext_capacity == 0){
266
329
perror("adjustbuffer");
267
330
plaintext_length = -1;
268
331
goto decrypt_end;
271
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
335
BUFFER_SIZE);
273
336
/* Print the data, if any */
274
if (ret == 0){
337
if(ret == 0){
275
338
/* EOF */
276
339
break;
277
340
}
282
345
}
283
346
plaintext_length += ret;
284
347
}
285
348
286
349
if(debug){
287
350
fprintf(stderr, "Decrypted password is: ");
288
351
for(ssize_t i = 0; i < plaintext_length; i++){
301
364
return plaintext_length;
302
365
}
303
366
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
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)
307
371
ret = "(unknown)";
308
372
return ret;
309
373
}
324
388
}
325
389
326
390
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
330
394
return -1;
331
395
}
332
396
333
if (debug){
397
if(debug){
334
398
/* "Use a log level over 10 to enable all debugging options."
335
399
* - GnuTLS manual
336
400
*/
340
404
341
405
/* OpenPGP credentials */
342
406
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
warning */
346
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
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();
348
414
return -1;
349
415
}
350
416
351
417
if(debug){
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
354
420
seckeyfilename);
355
421
}
356
422
357
423
ret = gnutls_certificate_set_openpgp_key_file
358
424
(mc->cred, pubkeyfilename, seckeyfilename,
359
425
GNUTLS_OPENPGP_FMT_BASE64);
360
if (ret != GNUTLS_E_SUCCESS) {
426
if(ret != GNUTLS_E_SUCCESS) {
361
427
fprintf(stderr,
362
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
430
fprintf(stderr, "The GnuTLS error is: %s\n",
365
431
safer_gnutls_strerror(ret));
366
432
goto globalfail;
367
433
}
368
434
369
435
/* GnuTLS server initialization */
370
436
ret = gnutls_dh_params_init(&mc->dh_params);
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
374
440
goto globalfail;
375
441
}
376
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
380
446
goto globalfail;
381
447
}
382
448
383
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
384
450
385
451
return 0;
386
452
387
453
globalfail:
388
454
389
455
gnutls_certificate_free_credentials(mc->cred);
390
456
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
391
458
return -1;
392
393
459
}
394
460
395
461
static int init_gnutls_session(mandos_context *mc,
397
463
int ret;
398
464
/* GnuTLS session creation */
399
465
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
466
if(ret != GNUTLS_E_SUCCESS){
401
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
402
468
safer_gnutls_strerror(ret));
403
469
}
405
471
{
406
472
const char *err;
407
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
474
if(ret != GNUTLS_E_SUCCESS) {
409
475
fprintf(stderr, "Syntax error at: %s\n", err);
410
476
fprintf(stderr, "GnuTLS error: %s\n",
411
477
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
478
gnutls_deinit(*session);
413
479
return -1;
414
480
}
415
481
}
416
482
417
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
484
mc->cred);
419
if (ret != GNUTLS_E_SUCCESS) {
485
if(ret != GNUTLS_E_SUCCESS) {
420
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
421
487
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
488
gnutls_deinit(*session);
423
489
return -1;
424
490
}
425
491
426
492
/* ignore client certificate if any. */
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
429
495
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
431
497
432
498
return 0;
433
499
}
441
507
AvahiIfIndex if_index,
442
508
mandos_context *mc){
443
509
int ret, tcp_sd;
510
ssize_t sret;
444
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
445
512
char *buffer = NULL;
446
513
char *decrypted_buffer;
452
519
char interface[IF_NAMESIZE];
453
520
gnutls_session_t session;
454
521
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
457
524
return -1;
458
525
}
459
526
467
534
perror("socket");
468
535
return -1;
469
536
}
470
537
471
538
if(debug){
472
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
540
perror("if_indextoname");
481
548
/* It would be nice to have a way to detect if we were passed an
482
549
IPv4 address here. Now we assume an IPv6 address. */
483
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
484
if (ret < 0 ){
551
if(ret < 0 ){
485
552
perror("inet_pton");
486
553
return -1;
487
554
}
489
556
fprintf(stderr, "Bad address: %s\n", ip);
490
557
return -1;
491
558
}
492
to.in6.sin6_port = htons(port); /* Spurious warning */
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
493
562
494
563
to.in6.sin6_scope_id = (uint32_t)if_index;
495
564
508
577
}
509
578
510
579
ret = connect(tcp_sd, &to.in, sizeof(to));
511
if (ret < 0){
580
if(ret < 0){
512
581
perror("connect");
513
582
return -1;
514
583
}
515
584
516
585
const char *out = mandos_protocol_version;
517
586
written = 0;
518
while (true){
587
while(true){
519
588
size_t out_size = strlen(out);
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
590
out_size - written));
522
if (ret == -1){
591
if(ret == -1){
523
592
perror("write");
524
593
retval = -1;
525
594
goto mandos_end;
528
597
if(written < out_size){
529
598
continue;
530
599
} else {
531
if (out == mandos_protocol_version){
600
if(out == mandos_protocol_version){
532
601
written = 0;
533
602
out = "\r\n";
534
603
} else {
536
605
}
537
606
}
538
607
}
539
608
540
609
if(debug){
541
610
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
611
}
543
612
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
546
615
do{
547
ret = gnutls_handshake (session);
616
ret = gnutls_handshake(session);
548
617
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
549
618
550
if (ret != GNUTLS_E_SUCCESS){
619
if(ret != GNUTLS_E_SUCCESS){
551
620
if(debug){
552
621
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
553
gnutls_perror (ret);
622
gnutls_perror(ret);
554
623
}
555
624
retval = -1;
556
625
goto mandos_end;
562
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
563
632
ip);
564
633
}
565
634
566
635
while(true){
567
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
568
637
buffer_capacity);
569
if (buffer_capacity == 0){
638
if(buffer_capacity == 0){
570
639
perror("adjustbuffer");
571
640
retval = -1;
572
641
goto mandos_end;
573
642
}
574
643
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
577
if (ret == 0){
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
578
647
break;
579
648
}
580
if (ret < 0){
581
switch(ret){
649
if(sret < 0){
650
switch(sret){
582
651
case GNUTLS_E_INTERRUPTED:
583
652
case GNUTLS_E_AGAIN:
584
653
break;
585
654
case GNUTLS_E_REHANDSHAKE:
586
655
do{
587
ret = gnutls_handshake (session);
656
ret = gnutls_handshake(session);
588
657
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
589
if (ret < 0){
658
if(ret < 0){
590
659
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
591
gnutls_perror (ret);
660
gnutls_perror(ret);
592
661
retval = -1;
593
662
goto mandos_end;
594
663
}
597
666
fprintf(stderr, "Unknown error while reading data from"
598
667
" encrypted session with Mandos server\n");
599
668
retval = -1;
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
601
670
goto mandos_end;
602
671
}
603
672
} else {
604
buffer_length += (size_t) ret;
673
buffer_length += (size_t) sret;
605
674
}
606
675
}
607
676
609
678
fprintf(stderr, "Closing TLS session\n");
610
679
}
611
680
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
613
682
614
if (buffer_length > 0){
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
616
685
buffer_length,
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
620
688
written = 0;
621
689
while(written < (size_t) decrypted_buffer_size){
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
625
693
if(ret == 0 and ferror(stdout)){
626
694
if(debug){
627
695
fprintf(stderr, "Error writing encrypted data: %s\n",
644
712
645
713
mandos_end:
646
714
free(buffer);
647
close(tcp_sd);
648
gnutls_deinit (session);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
649
720
return retval;
650
721
}
651
722
669
740
/* Called whenever a service has been resolved successfully or
670
741
timed out */
671
742
672
switch (event) {
743
switch(event) {
673
744
default:
674
745
case AVAHI_RESOLVER_FAILURE:
675
746
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
683
754
avahi_address_snprint(ip, sizeof(ip), address);
684
755
if(debug){
685
756
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
686
PRIu16 ") on port %d\n", name, host_name, ip,
687
interface, port);
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
688
759
}
689
760
int ret = start_mandos_communication(ip, port, interface, mc);
690
if (ret == 0){
761
if(ret == 0){
691
762
avahi_simple_poll_quit(mc->simple_poll);
692
763
}
693
764
}
711
782
/* Called whenever a new services becomes available on the LAN or
712
783
is removed from the LAN */
713
784
714
switch (event) {
785
switch(event) {
715
786
default:
716
787
case AVAHI_BROWSER_FAILURE:
717
788
726
797
the callback function is called the Avahi server will free the
727
798
resolver for us. */
728
799
729
if (!(avahi_s_service_resolver_new(mc->server, interface,
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
730
801
protocol, name, type, domain,
731
802
AVAHI_PROTO_INET6, 0,
732
803
resolve_callback, mc)))
746
817
}
747
818
}
748
819
749
/* Combines file name and path and returns the malloced new
750
string. some sane checks could/should be added */
751
static char *combinepath(const char *first, const char *second){
752
char *tmp;
753
int ret = asprintf(&tmp, "%s/%s", first, second);
754
if(ret < 0){
755
return NULL;
756
}
757
return tmp;
758
}
759
760
761
820
int main(int argc, char *argv[]){
762
821
AvahiSServiceBrowser *sb = NULL;
763
822
int error;
764
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
765
826
int exitcode = EXIT_SUCCESS;
766
827
const char *interface = "eth0";
767
828
struct ifreq network;
769
830
uid_t uid;
770
831
gid_t gid;
771
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
772
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
773
char *pubkeyfilename = NULL;
774
char *seckeyfilename = NULL;
775
const char *pubkeyname = "pubkey.txt";
776
const char *seckeyname = "seckey.txt";
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
777
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
779
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
780
843
781
844
{
782
845
struct argp_option options[] = {
783
846
{ .name = "debug", .key = 128,
784
847
.doc = "Debug mode", .group = 3 },
785
848
{ .name = "connect", .key = 'c',
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
788
851
.group = 1 },
789
852
{ .name = "interface", .key = 'i',
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
796
856
.group = 1 },
797
857
{ .name = "seckey", .key = 's',
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
800
860
.group = 1 },
801
861
{ .name = "pubkey", .key = 'p',
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
804
864
.group = 2 },
805
865
{ .name = "dh-bits", .key = 129,
806
866
.arg = "BITS",
807
.doc = "dh-bits to use in gnutls communication",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
808
869
.group = 2 },
809
870
{ .name = "priority", .key = 130,
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
812
874
{ .name = NULL }
813
875
};
814
815
876
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128:
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
822
881
debug = true;
823
882
break;
824
case 'c':
883
case 'c': /* --connect */
825
884
connect_to = arg;
826
885
break;
827
case 'i':
886
case 'i': /* --interface */
828
887
interface = arg;
829
888
break;
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyname = arg;
835
break;
836
case 'p':
837
pubkeyname = arg;
838
break;
839
case 129:
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
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");
844
900
exit(EXIT_FAILURE);
845
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
846
903
break;
847
case 130:
904
case 130: /* --priority */
848
905
mc.priority = arg;
849
906
break;
850
907
case ARGP_KEY_ARG:
851
argp_usage (state);
908
argp_usage(state);
852
909
case ARGP_KEY_END:
853
910
break;
854
911
default:
856
913
}
857
914
return 0;
858
915
}
859
916
860
917
struct argp argp = { .options = options, .parser = parse_opt,
861
918
.args_doc = "",
862
919
.doc = "Mandos client -- Get and decrypt"
863
" passwords from mandos server" };
864
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
865
if (ret == ARGP_ERR_UNKNOWN){
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
866
923
fprintf(stderr, "Unknown error while parsing arguments\n");
867
924
exitcode = EXIT_FAILURE;
868
925
goto end;
869
926
}
870
927
}
871
872
pubkeyfilename = combinepath(keydir, pubkeyname);
873
if (pubkeyfilename == NULL){
874
perror("combinepath");
875
exitcode = EXIT_FAILURE;
876
goto end;
877
}
878
879
seckeyfilename = combinepath(keydir, seckeyname);
880
if (seckeyfilename == NULL){
881
perror("combinepath");
882
exitcode = EXIT_FAILURE;
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global failed\n");
889
exitcode = EXIT_FAILURE;
890
goto end;
891
} else {
892
gnutls_initalized = true;
893
}
894
928
895
929
/* If the interface is down, bring it up */
896
930
{
916
950
goto end;
917
951
}
918
952
}
919
close(sd);
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
920
957
}
921
958
922
959
uid = getuid();
923
960
gid = getgid();
924
961
925
962
ret = setuid(uid);
926
if (ret == -1){
963
if(ret == -1){
927
964
perror("setuid");
928
965
}
929
966
930
967
setgid(gid);
931
if (ret == -1){
968
if(ret == -1){
932
969
perror("setgid");
933
970
}
934
971
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
935
995
if_index = (AvahiIfIndex) if_nametoindex(interface);
936
996
if(if_index == 0){
937
997
fprintf(stderr, "No such interface: \"%s\"\n", interface);
947
1007
exitcode = EXIT_FAILURE;
948
1008
goto end;
949
1009
}
950
errno = 0;
951
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
952
if(errno){
953
perror("Bad port number");
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");
954
1015
exitcode = EXIT_FAILURE;
955
1016
goto end;
956
1017
}
1018
port = (uint16_t)tmpmax;
957
1019
*address = '\0';
958
1020
address = connect_to;
959
1021
ret = start_mandos_communication(address, port, if_index, &mc);
965
1027
goto end;
966
1028
}
967
1029
968
if (not debug){
1030
if(not debug){
969
1031
avahi_set_log_function(empty_log);
970
1032
}
971
1033
974
1036
975
1037
/* Allocate main Avahi loop object */
976
1038
mc.simple_poll = avahi_simple_poll_new();
977
if (mc.simple_poll == NULL) {
1039
if(mc.simple_poll == NULL) {
978
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
979
1041
" object.\n");
980
1042
exitcode = EXIT_FAILURE;
981
1043
goto end;
982
1044
}
983
1045
984
1046
{
985
1047
AvahiServerConfig config;
986
1048
/* Do not publish any local Zeroconf records */
989
1051
config.publish_addresses = 0;
990
1052
config.publish_workstation = 0;
991
1053
config.publish_domain = 0;
992
1054
993
1055
/* Allocate a new server */
994
1056
mc.server = avahi_server_new(avahi_simple_poll_get
995
1057
(mc.simple_poll), &config, NULL,
996
1058
NULL, &error);
997
1059
998
1060
/* Free the Avahi configuration data */
999
1061
avahi_server_config_free(&config);
1000
1062
}
1001
1063
1002
1064
/* Check if creating the Avahi server object succeeded */
1003
if (mc.server == NULL) {
1065
if(mc.server == NULL) {
1004
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1005
1067
avahi_strerror(error));
1006
1068
exitcode = EXIT_FAILURE;
1012
1074
AVAHI_PROTO_INET6,
1013
1075
"_mandos._tcp", NULL, 0,
1014
1076
browse_callback, &mc);
1015
if (sb == NULL) {
1077
if(sb == NULL) {
1016
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1017
1079
avahi_strerror(avahi_server_errno(mc.server)));
1018
1080
exitcode = EXIT_FAILURE;
1020
1082
}
1021
1083
1022
1084
/* Run the main loop */
1023
1024
if (debug){
1085
1086
if(debug){
1025
1087
fprintf(stderr, "Starting Avahi loop search\n");
1026
1088
}
1027
1089
1028
1090
avahi_simple_poll_loop(mc.simple_poll);
1029
1091
1030
1092
end:
1031
1032
if (debug){
1093
1094
if(debug){
1033
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1034
1096
}
1035
1097
1036
1098
/* Cleanup things */
1037
if (sb != NULL)
1099
if(sb != NULL)
1038
1100
avahi_s_service_browser_free(sb);
1039
1101
1040
if (mc.server != NULL)
1102
if(mc.server != NULL)
1041
1103
avahi_server_free(mc.server);
1042
1043
if (mc.simple_poll != NULL)
1104
1105
if(mc.simple_poll != NULL)
1044
1106
avahi_simple_poll_free(mc.simple_poll);
1045
free(pubkeyfilename);
1046
free(seckeyfilename);
1047
1048
if (gnutls_initalized){
1107
1108
if(gnutls_initalized){
1049
1109
gnutls_certificate_free_credentials(mc.cred);
1050
gnutls_global_deinit ();
1051
}
1052
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
1053
1157
return exitcode;
1054
1158
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0