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- Committer: Teddy Hogeborn
- Date: 2008-09-02 13:04:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20080902130442-ytnjsmllaph18e20
* plugin-runner.xml (PLUGINS/WRITING PLUGINS): New section.
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
36
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
36
38
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
38
stdout, ferror() */
41
39
#include <stdint.h> /* uint16_t, uint32_t */
42
40
#include <stddef.h> /* NULL, size_t, ssize_t */
43
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
49
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
48
sockaddr_in6, PF_INET6,
51
49
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
55
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
53
struct in6_addr, inet_pton(),
57
54
connect() */
58
#include <fcntl.h> /* open() */
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
55
#include <assert.h> /* assert() */
63
56
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
57
#include <time.h> /* time() */
65
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
59
SIOCSIFFLAGS, if_indextoname(),
67
60
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
69
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
62
getuid(), getgid(), setuid(),
71
63
setgid() */
64
#include <netinet/in.h>
72
65
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
66
#include <iso646.h> /* not, and */
74
67
#include <argp.h> /* struct argp_option, error_t, struct
75
68
argp_state, struct argp,
76
69
argp_parse(), ARGP_KEY_ARG,
77
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <sys/klog.h> /* klogctl() */
79
71
80
72
/* Avahi */
81
73
/* All Avahi types, constants and functions
94
86
gnutls_*
95
87
init_gnutls_session(),
96
88
GNUTLS_* */
97
#include <gnutls/openpgp.h>
98
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
99
90
GNUTLS_OPENPGP_FMT_BASE64 */
100
91
101
92
/* GPGME */
107
98
108
99
#define BUFFER_SIZE 256
109
100
110
#define PATHDIR "/conf/conf.d/mandos"
111
#define SECKEY "seckey.txt"
112
#define PUBKEY "pubkey.txt"
113
114
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
115
103
static const char mandos_protocol_version[] = "1";
116
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
117
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
118
106
119
107
/* Used for passing in values through the Avahi callback functions */
124
112
unsigned int dh_bits;
125
113
gnutls_dh_params_t dh_params;
126
114
const char *priority;
127
gpgme_ctx_t ctx;
128
115
} mandos_context;
129
116
130
117
/*
134
121
*/
135
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
136
123
size_t buffer_capacity){
137
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
138
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
139
if(buffer == NULL){
126
if (buffer == NULL){
140
127
return 0;
141
128
}
142
129
buffer_capacity += BUFFER_SIZE;
145
132
}
146
133
147
134
/*
148
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
149
137
*/
150
static bool init_gpgme(mandos_context *mc, const char *seckey,
151
const char *pubkey, const char *tempdir){
152
int ret;
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
153
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
154
148
gpgme_engine_info_t engine_info;
155
149
156
157
/*
158
* Helper function to insert pub and seckey to the engine keyring.
159
*/
160
bool import_key(const char *filename){
161
int fd;
162
gpgme_data_t pgp_data;
163
164
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
165
if(fd == -1){
166
perror("open");
167
return false;
168
}
169
170
rc = gpgme_data_new_from_fd(&pgp_data, fd);
171
if(rc != GPG_ERR_NO_ERROR){
172
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
173
gpgme_strsource(rc), gpgme_strerror(rc));
174
return false;
175
}
176
177
rc = gpgme_op_import(mc->ctx, pgp_data);
178
if(rc != GPG_ERR_NO_ERROR){
179
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
180
gpgme_strsource(rc), gpgme_strerror(rc));
181
return false;
182
}
183
184
ret = (int)TEMP_FAILURE_RETRY(close(fd));
185
if(ret == -1){
186
perror("close");
187
}
188
gpgme_data_release(pgp_data);
189
return true;
190
}
191
192
if(debug){
193
fprintf(stderr, "Initialize gpgme\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
194
152
}
195
153
196
154
/* Init GPGME */
197
155
gpgme_check_version(NULL);
198
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
199
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
200
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
201
159
gpgme_strsource(rc), gpgme_strerror(rc));
202
return false;
160
return -1;
203
161
}
204
162
205
/* Set GPGME home directory for the OpenPGP engine only */
206
rc = gpgme_get_engine_info(&engine_info);
207
if(rc != GPG_ERR_NO_ERROR){
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
208
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
209
167
gpgme_strsource(rc), gpgme_strerror(rc));
210
return false;
168
return -1;
211
169
}
212
170
while(engine_info != NULL){
213
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
214
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
215
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
216
174
break;
217
175
}
218
176
engine_info = engine_info->next;
219
177
}
220
178
if(engine_info == NULL){
221
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
222
return false;
223
}
224
225
/* Create new GPGME "context" */
226
rc = gpgme_new(&(mc->ctx));
227
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_new: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
230
return false;
231
}
232
233
if(not import_key(pubkey) or not import_key(seckey)){
234
return false;
235
}
236
237
return true;
238
}
239
240
/*
241
* Decrypt OpenPGP data.
242
* Returns -1 on error
243
*/
244
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
245
const char *cryptotext,
246
size_t crypto_size,
247
char **plaintext){
248
gpgme_data_t dh_crypto, dh_plain;
249
gpgme_error_t rc;
250
ssize_t ret;
251
size_t plaintext_capacity = 0;
252
ssize_t plaintext_length = 0;
253
254
if(debug){
255
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
256
181
}
257
182
258
183
/* Create new GPGME data buffer from memory cryptotext */
259
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
260
185
0);
261
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
262
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
263
188
gpgme_strsource(rc), gpgme_strerror(rc));
264
189
return -1;
266
191
267
192
/* Create new empty GPGME data buffer for the plaintext */
268
193
rc = gpgme_data_new(&dh_plain);
269
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
270
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
271
196
gpgme_strsource(rc), gpgme_strerror(rc));
272
197
gpgme_data_release(dh_crypto);
273
198
return -1;
274
199
}
275
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
276
210
/* Decrypt data from the cryptotext data buffer to the plaintext
277
211
data buffer */
278
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
279
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
280
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
281
215
gpgme_strsource(rc), gpgme_strerror(rc));
282
216
plaintext_length = -1;
283
if(debug){
217
if (debug){
284
218
gpgme_decrypt_result_t result;
285
result = gpgme_op_decrypt_result(mc->ctx);
286
if(result == NULL){
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
287
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
288
222
} else {
289
223
fprintf(stderr, "Unsupported algorithm: %s\n",
316
250
}
317
251
318
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
319
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
320
perror("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
321
255
plaintext_length = -1;
322
256
goto decrypt_end;
323
257
}
327
261
plaintext_capacity = adjustbuffer(plaintext,
328
262
(size_t)plaintext_length,
329
263
plaintext_capacity);
330
if(plaintext_capacity == 0){
264
if (plaintext_capacity == 0){
331
265
perror("adjustbuffer");
332
266
plaintext_length = -1;
333
267
goto decrypt_end;
336
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
337
271
BUFFER_SIZE);
338
272
/* Print the data, if any */
339
if(ret == 0){
273
if (ret == 0){
340
274
/* EOF */
341
275
break;
342
276
}
347
281
}
348
282
plaintext_length += ret;
349
283
}
350
284
351
285
if(debug){
352
286
fprintf(stderr, "Decrypted password is: ");
353
287
for(ssize_t i = 0; i < plaintext_length; i++){
366
300
return plaintext_length;
367
301
}
368
302
369
static const char * safer_gnutls_strerror(int value) {
370
const char *ret = gnutls_strerror(value); /* Spurious warning from
371
-Wunreachable-code */
372
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
373
306
ret = "(unknown)";
374
307
return ret;
375
308
}
390
323
}
391
324
392
325
ret = gnutls_global_init();
393
if(ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "GnuTLS global_init: %s\n",
395
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
396
329
return -1;
397
330
}
398
331
399
if(debug){
332
if (debug){
400
333
/* "Use a log level over 10 to enable all debugging options."
401
334
* - GnuTLS manual
402
335
*/
406
339
407
340
/* OpenPGP credentials */
408
341
gnutls_certificate_allocate_credentials(&mc->cred);
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
411
* from
412
* -Wunreachable-code
413
*/
414
safer_gnutls_strerror(ret));
415
gnutls_global_deinit();
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
416
347
return -1;
417
348
}
418
349
419
350
if(debug){
420
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
421
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
422
353
seckeyfilename);
423
354
}
424
355
425
356
ret = gnutls_certificate_set_openpgp_key_file
426
357
(mc->cred, pubkeyfilename, seckeyfilename,
427
358
GNUTLS_OPENPGP_FMT_BASE64);
428
if(ret != GNUTLS_E_SUCCESS) {
359
if (ret != GNUTLS_E_SUCCESS) {
429
360
fprintf(stderr,
430
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
431
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
432
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
433
364
safer_gnutls_strerror(ret));
434
365
goto globalfail;
435
366
}
436
367
437
368
/* GnuTLS server initialization */
438
369
ret = gnutls_dh_params_init(&mc->dh_params);
439
if(ret != GNUTLS_E_SUCCESS) {
440
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
441
" %s\n", safer_gnutls_strerror(ret));
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
442
373
goto globalfail;
443
374
}
444
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
445
if(ret != GNUTLS_E_SUCCESS) {
446
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
447
safer_gnutls_strerror(ret));
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
448
379
goto globalfail;
449
380
}
450
381
451
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
452
383
453
384
return 0;
454
385
455
386
globalfail:
456
387
457
388
gnutls_certificate_free_credentials(mc->cred);
458
389
gnutls_global_deinit();
459
gnutls_dh_params_deinit(mc->dh_params);
460
390
return -1;
391
461
392
}
462
393
463
394
static int init_gnutls_session(mandos_context *mc,
465
396
int ret;
466
397
/* GnuTLS session creation */
467
398
ret = gnutls_init(session, GNUTLS_SERVER);
468
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
469
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
470
401
safer_gnutls_strerror(ret));
471
402
}
473
404
{
474
405
const char *err;
475
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
476
if(ret != GNUTLS_E_SUCCESS) {
407
if (ret != GNUTLS_E_SUCCESS) {
477
408
fprintf(stderr, "Syntax error at: %s\n", err);
478
409
fprintf(stderr, "GnuTLS error: %s\n",
479
410
safer_gnutls_strerror(ret));
480
gnutls_deinit(*session);
411
gnutls_deinit (*session);
481
412
return -1;
482
413
}
483
414
}
484
415
485
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
486
417
mc->cred);
487
if(ret != GNUTLS_E_SUCCESS) {
418
if (ret != GNUTLS_E_SUCCESS) {
488
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
489
420
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
421
gnutls_deinit (*session);
491
422
return -1;
492
423
}
493
424
494
425
/* ignore client certificate if any. */
495
gnutls_certificate_server_set_request(*session,
496
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
497
428
498
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
499
430
500
431
return 0;
501
432
}
509
440
AvahiIfIndex if_index,
510
441
mandos_context *mc){
511
442
int ret, tcp_sd;
512
ssize_t sret;
513
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
514
444
char *buffer = NULL;
515
445
char *decrypted_buffer;
521
451
char interface[IF_NAMESIZE];
522
452
gnutls_session_t session;
523
453
524
ret = init_gnutls_session(mc, &session);
525
if(ret != 0){
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
526
456
return -1;
527
457
}
528
458
536
466
perror("socket");
537
467
return -1;
538
468
}
539
469
540
470
if(debug){
541
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
542
472
perror("if_indextoname");
550
480
/* It would be nice to have a way to detect if we were passed an
551
481
IPv4 address here. Now we assume an IPv6 address. */
552
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
553
if(ret < 0 ){
483
if (ret < 0 ){
554
484
perror("inet_pton");
555
485
return -1;
556
486
}
558
488
fprintf(stderr, "Bad address: %s\n", ip);
559
489
return -1;
560
490
}
561
to.in6.sin6_port = htons(port); /* Spurious warnings from
562
-Wconversion and
563
-Wunreachable-code */
491
to.in6.sin6_port = htons(port); /* Spurious warning */
564
492
565
493
to.in6.sin6_scope_id = (uint32_t)if_index;
566
494
579
507
}
580
508
581
509
ret = connect(tcp_sd, &to.in, sizeof(to));
582
if(ret < 0){
510
if (ret < 0){
583
511
perror("connect");
584
512
return -1;
585
513
}
586
514
587
515
const char *out = mandos_protocol_version;
588
516
written = 0;
589
while(true){
517
while (true){
590
518
size_t out_size = strlen(out);
591
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
592
520
out_size - written));
593
if(ret == -1){
521
if (ret == -1){
594
522
perror("write");
595
523
retval = -1;
596
524
goto mandos_end;
599
527
if(written < out_size){
600
528
continue;
601
529
} else {
602
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
603
531
written = 0;
604
532
out = "\r\n";
605
533
} else {
607
535
}
608
536
}
609
537
}
610
538
611
539
if(debug){
612
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
613
541
}
614
542
615
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
616
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
617
545
do{
618
ret = gnutls_handshake(session);
546
ret = gnutls_handshake (session);
619
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
620
548
621
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
622
550
if(debug){
623
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
624
gnutls_perror(ret);
552
gnutls_perror (ret);
625
553
}
626
554
retval = -1;
627
555
goto mandos_end;
633
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
634
562
ip);
635
563
}
636
564
637
565
while(true){
638
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
639
567
buffer_capacity);
640
if(buffer_capacity == 0){
568
if (buffer_capacity == 0){
641
569
perror("adjustbuffer");
642
570
retval = -1;
643
571
goto mandos_end;
644
572
}
645
573
646
sret = gnutls_record_recv(session, buffer+buffer_length,
647
BUFFER_SIZE);
648
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
649
577
break;
650
578
}
651
if(sret < 0){
652
switch(sret){
579
if (ret < 0){
580
switch(ret){
653
581
case GNUTLS_E_INTERRUPTED:
654
582
case GNUTLS_E_AGAIN:
655
583
break;
656
584
case GNUTLS_E_REHANDSHAKE:
657
585
do{
658
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
659
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
660
if(ret < 0){
588
if (ret < 0){
661
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
662
gnutls_perror(ret);
590
gnutls_perror (ret);
663
591
retval = -1;
664
592
goto mandos_end;
665
593
}
668
596
fprintf(stderr, "Unknown error while reading data from"
669
597
" encrypted session with Mandos server\n");
670
598
retval = -1;
671
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
600
goto mandos_end;
673
601
}
674
602
} else {
675
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
676
604
}
677
605
}
678
606
680
608
fprintf(stderr, "Closing TLS session\n");
681
609
}
682
610
683
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
684
612
685
if(buffer_length > 0){
686
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
687
615
buffer_length,
688
&decrypted_buffer);
689
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
690
619
written = 0;
691
620
while(written < (size_t) decrypted_buffer_size){
692
ret = (int)fwrite(decrypted_buffer + written, 1,
693
(size_t)decrypted_buffer_size - written,
694
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
695
624
if(ret == 0 and ferror(stdout)){
696
625
if(debug){
697
626
fprintf(stderr, "Error writing encrypted data: %s\n",
714
643
715
644
mandos_end:
716
645
free(buffer);
717
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
718
if(ret == -1){
719
perror("close");
720
}
721
gnutls_deinit(session);
646
close(tcp_sd);
647
gnutls_deinit (session);
722
648
return retval;
723
649
}
724
650
742
668
/* Called whenever a service has been resolved successfully or
743
669
timed out */
744
670
745
switch(event) {
671
switch (event) {
746
672
default:
747
673
case AVAHI_RESOLVER_FAILURE:
748
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
756
682
avahi_address_snprint(ip, sizeof(ip), address);
757
683
if(debug){
758
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
759
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
760
ip, (intmax_t)interface, port);
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
761
687
}
762
688
int ret = start_mandos_communication(ip, port, interface, mc);
763
if(ret == 0){
689
if (ret == 0){
764
690
avahi_simple_poll_quit(mc->simple_poll);
765
691
}
766
692
}
784
710
/* Called whenever a new services becomes available on the LAN or
785
711
is removed from the LAN */
786
712
787
switch(event) {
713
switch (event) {
788
714
default:
789
715
case AVAHI_BROWSER_FAILURE:
790
716
799
725
the callback function is called the Avahi server will free the
800
726
resolver for us. */
801
727
802
if(!(avahi_s_service_resolver_new(mc->server, interface,
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
803
729
protocol, name, type, domain,
804
730
AVAHI_PROTO_INET6, 0,
805
731
resolve_callback, mc)))
819
745
}
820
746
}
821
747
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
753
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
757
}
758
759
822
760
int main(int argc, char *argv[]){
823
761
AvahiSServiceBrowser *sb = NULL;
824
762
int error;
825
763
int ret;
826
intmax_t tmpmax;
827
int numchars;
828
764
int exitcode = EXIT_SUCCESS;
829
765
const char *interface = "eth0";
830
766
struct ifreq network;
832
768
uid_t uid;
833
769
gid_t gid;
834
770
char *connect_to = NULL;
835
char tempdir[] = "/tmp/mandosXXXXXX";
836
bool tempdir_created = false;
837
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
838
const char *seckey = PATHDIR "/" SECKEY;
839
const char *pubkey = PATHDIR "/" PUBKEY;
840
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
841
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
842
.dh_bits = 1024, .priority = "SECURE256"
843
":!CTYPE-X.509:+CTYPE-OPENPGP" };
844
bool gnutls_initialized = false;
845
bool gpgme_initialized = false;
846
double delay = 2.5;
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
847
779
848
780
{
849
781
struct argp_option options[] = {
850
782
{ .name = "debug", .key = 128,
851
783
.doc = "Debug mode", .group = 3 },
852
784
{ .name = "connect", .key = 'c',
853
.arg = "ADDRESS:PORT",
854
.doc = "Connect directly to a specific Mandos server",
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
855
787
.group = 1 },
856
788
{ .name = "interface", .key = 'i',
857
.arg = "NAME",
858
.doc = "Interface that will be used to search for Mandos"
859
" servers",
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
860
795
.group = 1 },
861
796
{ .name = "seckey", .key = 's',
862
.arg = "FILE",
863
.doc = "OpenPGP secret key file base name",
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
864
799
.group = 1 },
865
800
{ .name = "pubkey", .key = 'p',
866
.arg = "FILE",
867
.doc = "OpenPGP public key file base name",
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
868
803
.group = 2 },
869
804
{ .name = "dh-bits", .key = 129,
870
805
.arg = "BITS",
871
.doc = "Bit length of the prime number used in the"
872
" Diffie-Hellman key exchange",
806
.doc = "dh-bits to use in gnutls communication",
873
807
.group = 2 },
874
808
{ .name = "priority", .key = 130,
875
.arg = "STRING",
876
.doc = "GnuTLS priority string for the TLS handshake",
877
.group = 1 },
878
{ .name = "delay", .key = 131,
879
.arg = "SECONDS",
880
.doc = "Maximum delay to wait for interface startup",
881
.group = 2 },
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
882
811
{ .name = NULL }
883
812
};
813
884
814
885
error_t parse_opt(int key, char *arg,
886
struct argp_state *state) {
887
switch(key) {
888
case 128: /* --debug */
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
889
821
debug = true;
890
822
break;
891
case 'c': /* --connect */
823
case 'c':
892
824
connect_to = arg;
893
825
break;
894
case 'i': /* --interface */
826
case 'i':
895
827
interface = arg;
896
828
break;
897
case 's': /* --seckey */
898
seckey = arg;
899
break;
900
case 'p': /* --pubkey */
901
pubkey = arg;
902
break;
903
case 129: /* --dh-bits */
904
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
905
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
906
or arg[numchars] != '\0'){
907
fprintf(stderr, "Bad number of DH bits\n");
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
908
843
exit(EXIT_FAILURE);
909
844
}
910
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
911
845
break;
912
case 130: /* --priority */
846
case 130:
913
847
mc.priority = arg;
914
848
break;
915
case 131: /* --delay */
916
ret = sscanf(arg, "%lf%n", &delay, &numchars);
917
if(ret < 1 or arg[numchars] != '\0'){
918
fprintf(stderr, "Bad delay\n");
919
exit(EXIT_FAILURE);
920
}
921
break;
922
849
case ARGP_KEY_ARG:
923
argp_usage(state);
850
argp_usage (state);
924
851
case ARGP_KEY_END:
925
852
break;
926
853
default:
928
855
}
929
856
return 0;
930
857
}
931
858
932
859
struct argp argp = { .options = options, .parser = parse_opt,
933
860
.args_doc = "",
934
861
.doc = "Mandos client -- Get and decrypt"
935
" passwords from a Mandos server" };
936
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
937
if(ret == ARGP_ERR_UNKNOWN){
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
938
865
fprintf(stderr, "Unknown error while parsing arguments\n");
939
866
exitcode = EXIT_FAILURE;
940
867
goto end;
941
868
}
942
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
943
893
944
894
/* If the interface is down, bring it up */
945
895
{
946
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
947
messages to mess up the prompt */
948
ret = klogctl(8, NULL, 5);
949
if(ret == -1){
950
perror("klogctl");
951
}
952
953
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
954
897
if(sd < 0) {
955
898
perror("socket");
956
899
exitcode = EXIT_FAILURE;
957
ret = klogctl(7, NULL, 0);
958
if(ret == -1){
959
perror("klogctl");
960
}
961
900
goto end;
962
901
}
963
902
strcpy(network.ifr_name, interface);
964
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
965
904
if(ret == -1){
966
905
perror("ioctl SIOCGIFFLAGS");
967
ret = klogctl(7, NULL, 0);
968
if(ret == -1){
969
perror("klogctl");
970
}
971
906
exitcode = EXIT_FAILURE;
972
907
goto end;
973
908
}
977
912
if(ret == -1){
978
913
perror("ioctl SIOCSIFFLAGS");
979
914
exitcode = EXIT_FAILURE;
980
ret = klogctl(7, NULL, 0);
981
if(ret == -1){
982
perror("klogctl");
983
}
984
915
goto end;
985
916
}
986
917
}
987
/* sleep checking until interface is running */
988
for(int i=0; i < delay * 4; i++){
989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
990
if(ret == -1){
991
perror("ioctl SIOCGIFFLAGS");
992
} else if(network.ifr_flags & IFF_RUNNING){
993
break;
994
}
995
struct timespec sleeptime = { .tv_nsec = 250000000 };
996
nanosleep(&sleeptime, NULL);
997
}
998
ret = (int)TEMP_FAILURE_RETRY(close(sd));
999
if(ret == -1){
1000
perror("close");
1001
}
1002
/* Restores kernel loglevel to default */
1003
ret = klogctl(7, NULL, 0);
1004
if(ret == -1){
1005
perror("klogctl");
1006
}
918
close(sd);
1007
919
}
1008
920
1009
921
uid = getuid();
1010
922
gid = getgid();
1011
923
924
ret = setuid(uid);
925
if (ret == -1){
926
perror("setuid");
927
}
928
1012
929
setgid(gid);
1013
if(ret == -1){
930
if (ret == -1){
1014
931
perror("setgid");
1015
932
}
1016
933
1017
ret = setuid(uid);
1018
if(ret == -1){
1019
perror("setuid");
1020
}
1021
1022
ret = init_gnutls_global(&mc, pubkey, seckey);
1023
if(ret == -1){
1024
fprintf(stderr, "init_gnutls_global failed\n");
1025
exitcode = EXIT_FAILURE;
1026
goto end;
1027
} else {
1028
gnutls_initialized = true;
1029
}
1030
1031
if(mkdtemp(tempdir) == NULL){
1032
perror("mkdtemp");
1033
goto end;
1034
}
1035
tempdir_created = true;
1036
1037
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1038
fprintf(stderr, "init_gpgme failed\n");
1039
exitcode = EXIT_FAILURE;
1040
goto end;
1041
} else {
1042
gpgme_initialized = true;
1043
}
1044
1045
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
1046
935
if(if_index == 0){
1047
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1048
exitcode = EXIT_FAILURE;
1049
goto end;
937
exit(EXIT_FAILURE);
1050
938
}
1051
939
1052
940
if(connect_to != NULL){
1058
946
exitcode = EXIT_FAILURE;
1059
947
goto end;
1060
948
}
1061
uint16_t port;
1062
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1063
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1064
or address[numchars+1] != '\0'){
1065
fprintf(stderr, "Bad port number\n");
949
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
1066
953
exitcode = EXIT_FAILURE;
1067
954
goto end;
1068
955
}
1069
port = (uint16_t)tmpmax;
1070
956
*address = '\0';
1071
957
address = connect_to;
1072
958
ret = start_mandos_communication(address, port, if_index, &mc);
1078
964
goto end;
1079
965
}
1080
966
1081
if(not debug){
967
if (not debug){
1082
968
avahi_set_log_function(empty_log);
1083
969
}
1084
970
1087
973
1088
974
/* Allocate main Avahi loop object */
1089
975
mc.simple_poll = avahi_simple_poll_new();
1090
if(mc.simple_poll == NULL) {
976
if (mc.simple_poll == NULL) {
1091
977
fprintf(stderr, "Avahi: Failed to create simple poll"
1092
978
" object.\n");
1093
979
exitcode = EXIT_FAILURE;
1094
980
goto end;
1095
981
}
1096
982
1097
983
{
1098
984
AvahiServerConfig config;
1099
985
/* Do not publish any local Zeroconf records */
1102
988
config.publish_addresses = 0;
1103
989
config.publish_workstation = 0;
1104
990
config.publish_domain = 0;
1105
991
1106
992
/* Allocate a new server */
1107
993
mc.server = avahi_server_new(avahi_simple_poll_get
1108
994
(mc.simple_poll), &config, NULL,
1109
995
NULL, &error);
1110
996
1111
997
/* Free the Avahi configuration data */
1112
998
avahi_server_config_free(&config);
1113
999
}
1114
1000
1115
1001
/* Check if creating the Avahi server object succeeded */
1116
if(mc.server == NULL) {
1002
if (mc.server == NULL) {
1117
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1118
1004
avahi_strerror(error));
1119
1005
exitcode = EXIT_FAILURE;
1125
1011
AVAHI_PROTO_INET6,
1126
1012
"_mandos._tcp", NULL, 0,
1127
1013
browse_callback, &mc);
1128
if(sb == NULL) {
1014
if (sb == NULL) {
1129
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1130
1016
avahi_strerror(avahi_server_errno(mc.server)));
1131
1017
exitcode = EXIT_FAILURE;
1133
1019
}
1134
1020
1135
1021
/* Run the main loop */
1136
1137
if(debug){
1022
1023
if (debug){
1138
1024
fprintf(stderr, "Starting Avahi loop search\n");
1139
1025
}
1140
1026
1141
1027
avahi_simple_poll_loop(mc.simple_poll);
1142
1028
1143
1029
end:
1144
1145
if(debug){
1030
1031
if (debug){
1146
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1147
1033
}
1148
1034
1149
1035
/* Cleanup things */
1150
if(sb != NULL)
1036
if (sb != NULL)
1151
1037
avahi_s_service_browser_free(sb);
1152
1038
1153
if(mc.server != NULL)
1039
if (mc.server != NULL)
1154
1040
avahi_server_free(mc.server);
1155
1156
if(mc.simple_poll != NULL)
1041
1042
if (mc.simple_poll != NULL)
1157
1043
avahi_simple_poll_free(mc.simple_poll);
1158
1159
if(gnutls_initialized){
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1160
1048
gnutls_certificate_free_credentials(mc.cred);
1161
gnutls_global_deinit();
1162
gnutls_dh_params_deinit(mc.dh_params);
1163
}
1164
1165
if(gpgme_initialized){
1166
gpgme_release(mc.ctx);
1167
}
1168
1169
/* Removes the temp directory used by GPGME */
1170
if(tempdir_created){
1171
DIR *d;
1172
struct dirent *direntry;
1173
d = opendir(tempdir);
1174
if(d == NULL){
1175
if(errno != ENOENT){
1176
perror("opendir");
1177
}
1178
} else {
1179
while(true){
1180
direntry = readdir(d);
1181
if(direntry == NULL){
1182
break;
1183
}
1184
/* Skip "." and ".." */
1185
if(direntry->d_name[0] == '.'
1186
and (direntry->d_name[1] == '\0'
1187
or (direntry->d_name[1] == '.'
1188
and direntry->d_name[2] == '\0'))){
1189
continue;
1190
}
1191
char *fullname = NULL;
1192
ret = asprintf(&fullname, "%s/%s", tempdir,
1193
direntry->d_name);
1194
if(ret < 0){
1195
perror("asprintf");
1196
continue;
1197
}
1198
ret = remove(fullname);
1199
if(ret == -1){
1200
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1201
strerror(errno));
1202
}
1203
free(fullname);
1204
}
1205
closedir(d);
1206
}
1207
ret = rmdir(tempdir);
1208
if(ret == -1 and errno != ENOENT){
1209
perror("rmdir");
1210
}
1049
gnutls_global_deinit ();
1211
1050
}
1212
1051
1213
1052
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0