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- Committer: Björn Påhlsson
- Date: 2009-01-29 22:01:00 UTC
- Revision ID: belorn@nexus-20090129220100-8wzzh4q1b1ka56a2
* mandos (main): Catch SIGSEGV and raise RuntimeError.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- 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(),
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,
47
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
50
sockaddr_in6, PF_INET6,
49
51
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
52
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
56
struct in6_addr, inet_pton(),
54
57
connect() */
58
#include <fcntl.h> /* open() */
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
55
62
#include <assert.h> /* assert() */
56
63
#include <errno.h> /* perror(), errno */
57
64
#include <time.h> /* time() */
58
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
66
SIOCSIFFLAGS, if_indextoname(),
60
67
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
61
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
70
getuid(), getgid(), setuid(),
63
71
setgid() */
64
#include <netinet/in.h>
65
72
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
73
#include <iso646.h> /* not, and, or */
67
74
#include <argp.h> /* struct argp_option, error_t, struct
68
75
argp_state, struct argp,
69
76
argp_parse(), ARGP_KEY_ARG,
86
93
gnutls_*
87
94
init_gnutls_session(),
88
95
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
96
#include <gnutls/openpgp.h>
97
/* gnutls_certificate_set_openpgp_key_file(),
90
98
GNUTLS_OPENPGP_FMT_BASE64 */
91
99
92
100
/* GPGME */
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 engine 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
}
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", pubkeyfilename,
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
353
421
seckeyfilename);
354
422
}
355
423
356
424
ret = gnutls_certificate_set_openpgp_key_file
357
425
(mc->cred, pubkeyfilename, seckeyfilename,
358
426
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
427
if(ret != GNUTLS_E_SUCCESS) {
360
428
fprintf(stderr,
361
429
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
430
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
431
fprintf(stderr, "The GnuTLS error is: %s\n",
364
432
safer_gnutls_strerror(ret));
365
433
goto globalfail;
366
434
}
367
435
368
436
/* GnuTLS server initialization */
369
437
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %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));
373
441
goto globalfail;
374
442
}
375
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
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));
379
447
goto globalfail;
380
448
}
381
449
382
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
451
384
452
return 0;
385
453
386
454
globalfail:
387
455
388
456
gnutls_certificate_free_credentials(mc->cred);
389
457
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
390
459
return -1;
391
392
460
}
393
461
394
462
static int init_gnutls_session(mandos_context *mc,
396
464
int ret;
397
465
/* GnuTLS session creation */
398
466
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
467
if(ret != GNUTLS_E_SUCCESS){
400
468
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
469
safer_gnutls_strerror(ret));
402
470
}
404
472
{
405
473
const char *err;
406
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
475
if(ret != GNUTLS_E_SUCCESS) {
408
476
fprintf(stderr, "Syntax error at: %s\n", err);
409
477
fprintf(stderr, "GnuTLS error: %s\n",
410
478
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
479
gnutls_deinit(*session);
412
480
return -1;
413
481
}
414
482
}
415
483
416
484
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
485
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
486
if(ret != GNUTLS_E_SUCCESS) {
419
487
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
488
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
489
gnutls_deinit(*session);
422
490
return -1;
423
491
}
424
492
425
493
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
428
496
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
430
498
431
499
return 0;
432
500
}
440
508
AvahiIfIndex if_index,
441
509
mandos_context *mc){
442
510
int ret, tcp_sd;
511
ssize_t sret;
443
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
444
513
char *buffer = NULL;
445
514
char *decrypted_buffer;
451
520
char interface[IF_NAMESIZE];
452
521
gnutls_session_t session;
453
522
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
523
ret = init_gnutls_session(mc, &session);
524
if(ret != 0){
456
525
return -1;
457
526
}
458
527
466
535
perror("socket");
467
536
return -1;
468
537
}
469
538
470
539
if(debug){
471
540
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
541
perror("if_indextoname");
475
544
fprintf(stderr, "Binding to interface %s\n", interface);
476
545
}
477
546
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
547
memset(&to, 0, sizeof(to));
479
548
to.in6.sin6_family = AF_INET6;
480
549
/* It would be nice to have a way to detect if we were passed an
481
550
IPv4 address here. Now we assume an IPv6 address. */
482
551
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
552
if(ret < 0 ){
484
553
perror("inet_pton");
485
554
return -1;
486
555
}
488
557
fprintf(stderr, "Bad address: %s\n", ip);
489
558
return -1;
490
559
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
561
-Wconversion and
562
-Wunreachable-code */
492
563
493
564
to.in6.sin6_scope_id = (uint32_t)if_index;
494
565
507
578
}
508
579
509
580
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
581
if(ret < 0){
511
582
perror("connect");
512
583
return -1;
513
584
}
514
585
515
586
const char *out = mandos_protocol_version;
516
587
written = 0;
517
while (true){
588
while(true){
518
589
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
591
out_size - written));
521
if (ret == -1){
592
if(ret == -1){
522
593
perror("write");
523
594
retval = -1;
524
595
goto mandos_end;
527
598
if(written < out_size){
528
599
continue;
529
600
} else {
530
if (out == mandos_protocol_version){
601
if(out == mandos_protocol_version){
531
602
written = 0;
532
603
out = "\r\n";
533
604
} else {
535
606
}
536
607
}
537
608
}
538
609
539
610
if(debug){
540
611
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
612
}
542
613
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
545
616
do{
546
ret = gnutls_handshake (session);
617
ret = gnutls_handshake(session);
547
618
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
619
549
if (ret != GNUTLS_E_SUCCESS){
620
if(ret != GNUTLS_E_SUCCESS){
550
621
if(debug){
551
622
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
623
gnutls_perror(ret);
553
624
}
554
625
retval = -1;
555
626
goto mandos_end;
561
632
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
633
ip);
563
634
}
564
635
565
636
while(true){
566
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
638
buffer_capacity);
568
if (buffer_capacity == 0){
639
if(buffer_capacity == 0){
569
640
perror("adjustbuffer");
570
641
retval = -1;
571
642
goto mandos_end;
572
643
}
573
644
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
645
sret = gnutls_record_recv(session, buffer+buffer_length,
646
BUFFER_SIZE);
647
if(sret == 0){
577
648
break;
578
649
}
579
if (ret < 0){
580
switch(ret){
650
if(sret < 0){
651
switch(sret){
581
652
case GNUTLS_E_INTERRUPTED:
582
653
case GNUTLS_E_AGAIN:
583
654
break;
584
655
case GNUTLS_E_REHANDSHAKE:
585
656
do{
586
ret = gnutls_handshake (session);
657
ret = gnutls_handshake(session);
587
658
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
if (ret < 0){
659
if(ret < 0){
589
660
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
661
gnutls_perror(ret);
591
662
retval = -1;
592
663
goto mandos_end;
593
664
}
596
667
fprintf(stderr, "Unknown error while reading data from"
597
668
" encrypted session with Mandos server\n");
598
669
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
600
671
goto mandos_end;
601
672
}
602
673
} else {
603
buffer_length += (size_t) ret;
674
buffer_length += (size_t) sret;
604
675
}
605
676
}
606
677
608
679
fprintf(stderr, "Closing TLS session\n");
609
680
}
610
681
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
612
683
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
684
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
615
686
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
687
&decrypted_buffer);
688
if(decrypted_buffer_size >= 0){
619
689
written = 0;
620
690
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
691
ret = (int)fwrite(decrypted_buffer + written, 1,
692
(size_t)decrypted_buffer_size - written,
693
stdout);
624
694
if(ret == 0 and ferror(stdout)){
625
695
if(debug){
626
696
fprintf(stderr, "Error writing encrypted data: %s\n",
635
705
} else {
636
706
retval = -1;
637
707
}
708
} else {
709
retval = -1;
638
710
}
639
711
640
712
/* Shutdown procedure */
641
713
642
714
mandos_end:
643
715
free(buffer);
644
close(tcp_sd);
645
gnutls_deinit (session);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
719
}
720
gnutls_deinit(session);
646
721
return retval;
647
722
}
648
723
661
736
flags,
662
737
void* userdata) {
663
738
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
739
assert(r);
665
740
666
741
/* Called whenever a service has been resolved successfully or
667
742
timed out */
668
743
669
switch (event) {
744
switch(event) {
670
745
default:
671
746
case AVAHI_RESOLVER_FAILURE:
672
747
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
680
755
avahi_address_snprint(ip, sizeof(ip), address);
681
756
if(debug){
682
757
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
ip, (intmax_t)interface, port);
685
760
}
686
761
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
762
if(ret == 0){
688
763
avahi_simple_poll_quit(mc->simple_poll);
689
764
}
690
765
}
703
778
flags,
704
779
void* userdata) {
705
780
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
781
assert(b);
707
782
708
783
/* Called whenever a new services becomes available on the LAN or
709
784
is removed from the LAN */
710
785
711
switch (event) {
786
switch(event) {
712
787
default:
713
788
case AVAHI_BROWSER_FAILURE:
714
789
723
798
the callback function is called the Avahi server will free the
724
799
resolver for us. */
725
800
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
727
802
protocol, name, type, domain,
728
803
AVAHI_PROTO_INET6, 0,
729
804
resolve_callback, mc)))
743
818
}
744
819
}
745
820
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
749
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
755
}
756
757
758
821
int main(int argc, char *argv[]){
759
822
AvahiSServiceBrowser *sb = NULL;
760
823
int error;
761
824
int ret;
825
intmax_t tmpmax;
826
int numchars;
762
827
int exitcode = EXIT_SUCCESS;
763
828
const char *interface = "eth0";
764
829
struct ifreq network;
766
831
uid_t uid;
767
832
gid_t gid;
768
833
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
bool tempdir_created = false;
769
836
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
837
const char *seckey = PATHDIR "/" SECKEY;
838
const char *pubkey = PATHDIR "/" PUBKEY;
839
774
840
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
841
.dh_bits = 1024, .priority = "SECURE256"
842
":!CTYPE-X.509:+CTYPE-OPENPGP" };
843
bool gnutls_initialized = false;
844
bool gpgme_initialized = false;
777
845
778
846
{
779
847
struct argp_option options[] = {
780
848
{ .name = "debug", .key = 128,
781
849
.doc = "Debug mode", .group = 3 },
782
850
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
851
.arg = "ADDRESS:PORT",
852
.doc = "Connect directly to a specific Mandos server",
785
853
.group = 1 },
786
854
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
855
.arg = "NAME",
856
.doc = "Interface that will be used to search for Mandos"
857
" servers",
793
858
.group = 1 },
794
859
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
860
.arg = "FILE",
861
.doc = "OpenPGP secret key file base name",
797
862
.group = 1 },
798
863
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
864
.arg = "FILE",
865
.doc = "OpenPGP public key file base name",
801
866
.group = 2 },
802
867
{ .name = "dh-bits", .key = 129,
803
868
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
869
.doc = "Bit length of the prime number used in the"
870
" Diffie-Hellman key exchange",
805
871
.group = 2 },
806
872
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
873
.arg = "STRING",
874
.doc = "GnuTLS priority string for the TLS handshake",
875
.group = 1 },
809
876
{ .name = NULL }
810
877
};
811
812
878
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
879
error_t parse_opt(int key, char *arg,
880
struct argp_state *state) {
881
switch(key) {
882
case 128: /* --debug */
819
883
debug = true;
820
884
break;
821
case 'c':
885
case 'c': /* --connect */
822
886
connect_to = arg;
823
887
break;
824
case 'i':
888
case 'i': /* --interface */
825
889
interface = arg;
826
890
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
891
case 's': /* --seckey */
892
seckey = arg;
893
break;
894
case 'p': /* --pubkey */
895
pubkey = arg;
896
break;
897
case 129: /* --dh-bits */
898
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
899
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
900
or arg[numchars] != '\0'){
901
fprintf(stderr, "Bad number of DH bits\n");
841
902
exit(EXIT_FAILURE);
842
903
}
904
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
843
905
break;
844
case 130:
906
case 130: /* --priority */
845
907
mc.priority = arg;
846
908
break;
847
909
case ARGP_KEY_ARG:
848
argp_usage (state);
910
argp_usage(state);
849
911
case ARGP_KEY_END:
850
912
break;
851
913
default:
853
915
}
854
916
return 0;
855
917
}
856
918
857
919
struct argp argp = { .options = options, .parser = parse_opt,
858
920
.args_doc = "",
859
921
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
922
" passwords from a Mandos server" };
923
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
924
if(ret == ARGP_ERR_UNKNOWN){
863
925
fprintf(stderr, "Unknown error while parsing arguments\n");
864
926
exitcode = EXIT_FAILURE;
865
927
goto end;
866
928
}
867
929
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
891
930
892
931
/* If the interface is down, bring it up */
893
932
{
897
936
exitcode = EXIT_FAILURE;
898
937
goto end;
899
938
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
939
strcpy(network.ifr_name, interface);
901
940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
902
941
if(ret == -1){
903
942
perror("ioctl SIOCGIFFLAGS");
913
952
goto end;
914
953
}
915
954
}
916
close(sd);
955
ret = (int)TEMP_FAILURE_RETRY(close(sd));
956
if(ret == -1){
957
perror("close");
958
}
917
959
}
918
960
919
961
uid = getuid();
920
962
gid = getgid();
921
963
922
964
ret = setuid(uid);
923
if (ret == -1){
965
if(ret == -1){
924
966
perror("setuid");
925
967
}
926
968
927
969
setgid(gid);
928
if (ret == -1){
970
if(ret == -1){
929
971
perror("setgid");
930
972
}
931
973
974
ret = init_gnutls_global(&mc, pubkey, seckey);
975
if(ret == -1){
976
fprintf(stderr, "init_gnutls_global failed\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
} else {
980
gnutls_initialized = true;
981
}
982
983
if(mkdtemp(tempdir) == NULL){
984
perror("mkdtemp");
985
goto end;
986
}
987
tempdir_created = true;
988
989
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
990
fprintf(stderr, "init_gpgme failed\n");
991
exitcode = EXIT_FAILURE;
992
goto end;
993
} else {
994
gpgme_initialized = true;
995
}
996
932
997
if_index = (AvahiIfIndex) if_nametoindex(interface);
933
998
if(if_index == 0){
934
999
fprintf(stderr, "No such interface: \"%s\"\n", interface);
935
exit(EXIT_FAILURE);
1000
exitcode = EXIT_FAILURE;
1001
goto end;
936
1002
}
937
1003
938
1004
if(connect_to != NULL){
944
1010
exitcode = EXIT_FAILURE;
945
1011
goto end;
946
1012
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
1013
uint16_t port;
1014
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1015
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1016
or address[numchars+1] != '\0'){
1017
fprintf(stderr, "Bad port number\n");
951
1018
exitcode = EXIT_FAILURE;
952
1019
goto end;
953
1020
}
1021
port = (uint16_t)tmpmax;
954
1022
*address = '\0';
955
1023
address = connect_to;
956
1024
ret = start_mandos_communication(address, port, if_index, &mc);
962
1030
goto end;
963
1031
}
964
1032
965
if (not debug){
1033
if(not debug){
966
1034
avahi_set_log_function(empty_log);
967
1035
}
968
1036
971
1039
972
1040
/* Allocate main Avahi loop object */
973
1041
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
1042
if(mc.simple_poll == NULL) {
975
1043
fprintf(stderr, "Avahi: Failed to create simple poll"
976
1044
" object.\n");
977
1045
exitcode = EXIT_FAILURE;
978
1046
goto end;
979
1047
}
980
1048
981
1049
{
982
1050
AvahiServerConfig config;
983
1051
/* Do not publish any local Zeroconf records */
986
1054
config.publish_addresses = 0;
987
1055
config.publish_workstation = 0;
988
1056
config.publish_domain = 0;
989
1057
990
1058
/* Allocate a new server */
991
1059
mc.server = avahi_server_new(avahi_simple_poll_get
992
1060
(mc.simple_poll), &config, NULL,
993
1061
NULL, &error);
994
1062
995
1063
/* Free the Avahi configuration data */
996
1064
avahi_server_config_free(&config);
997
1065
}
998
1066
999
1067
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1068
if(mc.server == NULL) {
1001
1069
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
1070
avahi_strerror(error));
1003
1071
exitcode = EXIT_FAILURE;
1009
1077
AVAHI_PROTO_INET6,
1010
1078
"_mandos._tcp", NULL, 0,
1011
1079
browse_callback, &mc);
1012
if (sb == NULL) {
1080
if(sb == NULL) {
1013
1081
fprintf(stderr, "Failed to create service browser: %s\n",
1014
1082
avahi_strerror(avahi_server_errno(mc.server)));
1015
1083
exitcode = EXIT_FAILURE;
1017
1085
}
1018
1086
1019
1087
/* Run the main loop */
1020
1021
if (debug){
1088
1089
if(debug){
1022
1090
fprintf(stderr, "Starting Avahi loop search\n");
1023
1091
}
1024
1092
1025
1093
avahi_simple_poll_loop(mc.simple_poll);
1026
1094
1027
1095
end:
1028
1029
if (debug){
1096
1097
if(debug){
1030
1098
fprintf(stderr, "%s exiting\n", argv[0]);
1031
1099
}
1032
1100
1033
1101
/* Cleanup things */
1034
if (sb != NULL)
1102
if(sb != NULL)
1035
1103
avahi_s_service_browser_free(sb);
1036
1104
1037
if (mc.server != NULL)
1105
if(mc.server != NULL)
1038
1106
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1107
1108
if(mc.simple_poll != NULL)
1041
1109
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1110
1111
if(gnutls_initialized){
1046
1112
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1113
gnutls_global_deinit();
1114
gnutls_dh_params_deinit(mc.dh_params);
1115
}
1116
1117
if(gpgme_initialized){
1118
gpgme_release(mc.ctx);
1119
}
1120
1121
/* Removes the temp directory used by GPGME */
1122
if(tempdir_created){
1123
DIR *d;
1124
struct dirent *direntry;
1125
d = opendir(tempdir);
1126
if(d == NULL){
1127
if(errno != ENOENT){
1128
perror("opendir");
1129
}
1130
} else {
1131
while(true){
1132
direntry = readdir(d);
1133
if(direntry == NULL){
1134
break;
1135
}
1136
/* Skip "." and ".." */
1137
if(direntry->d_name[0] == '.'
1138
and (direntry->d_name[1] == '\0'
1139
or (direntry->d_name[1] == '.'
1140
and direntry->d_name[2] == '\0'))){
1141
continue;
1142
}
1143
char *fullname = NULL;
1144
ret = asprintf(&fullname, "%s/%s", tempdir,
1145
direntry->d_name);
1146
if(ret < 0){
1147
perror("asprintf");
1148
continue;
1149
}
1150
ret = remove(fullname);
1151
if(ret == -1){
1152
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1153
strerror(errno));
1154
}
1155
free(fullname);
1156
}
1157
closedir(d);
1158
}
1159
ret = rmdir(tempdir);
1160
if(ret == -1 and errno != ENOENT){
1161
perror("rmdir");
1162
}
1048
1163
}
1049
1164
1050
1165
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0