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- Committer: Teddy Hogeborn
- Date: 2008-08-25 07:52:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20080825075235-gq338t4ywhqhire8
* mandos-clients.conf.xml (DESCRIPTION): Do not imply that this is the
only configuration file of
mandos(8).
(OPTIONS): Note that unknown options are ignored. When describing
"checker", be more specific about exit codes, and refer
to PATH. When describing "secret", refer to
mandos-keygen(8), and note the relationship with
"secfile". Added synopsis to "secfile", and note
relationship with "secret". Added synopsis and more text
to "host".
(EXAMPLE): Remove Radix-64 checksum from "secret" option value.
(SEE ALSO): New section, refer to mandos(8), mandos-keygen(8), and
mandos.conf(5).
only configuration file of
mandos(8).
(OPTIONS): Note that unknown options are ignored. When describing
"checker", be more specific about exit codes, and refer
to PATH. When describing "secret", refer to
mandos-keygen(8), and note the relationship with
"secfile". Added synopsis to "secfile", and note
relationship with "secret". Added synopsis and more text
to "host".
(EXAMPLE): Remove Radix-64 checksum from "secret" option value.
(SEE ALSO): New section, refer to mandos(8), mandos-keygen(8), and
mandos.conf(5).
- 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:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
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
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,
93
86
gnutls_*
94
87
init_gnutls_session(),
95
88
GNUTLS_* */
96
#include <gnutls/openpgp.h>
97
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
98
90
GNUTLS_OPENPGP_FMT_BASE64 */
99
91
100
92
/* GPGME */
106
98
107
99
#define BUFFER_SIZE 256
108
100
109
#define PATHDIR "/conf/conf.d/mandos"
110
#define SECKEY "seckey.txt"
111
#define PUBKEY "pubkey.txt"
112
113
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
114
103
static const char mandos_protocol_version[] = "1";
115
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
116
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
117
106
118
107
/* Used for passing in values through the Avahi callback functions */
123
112
unsigned int dh_bits;
124
113
gnutls_dh_params_t dh_params;
125
114
const char *priority;
126
gpgme_ctx_t ctx;
127
115
} mandos_context;
128
116
129
117
/*
133
121
*/
134
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
135
123
size_t buffer_capacity){
136
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
137
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
138
if(buffer == NULL){
126
if (buffer == NULL){
139
127
return 0;
140
128
}
141
129
buffer_capacity += BUFFER_SIZE;
144
132
}
145
133
146
134
/*
147
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
148
137
*/
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
150
const char *pubkey, const char *tempdir){
151
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;
152
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
153
148
gpgme_engine_info_t engine_info;
154
149
155
156
/*
157
* Helper function to insert pub and seckey to the enigne keyring.
158
*/
159
bool import_key(const char *filename){
160
int fd;
161
gpgme_data_t pgp_data;
162
163
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
164
if(fd == -1){
165
perror("open");
166
return false;
167
}
168
169
rc = gpgme_data_new_from_fd(&pgp_data, fd);
170
if(rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
return false;
174
}
175
176
rc = gpgme_op_import(mc->ctx, pgp_data);
177
if(rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
return false;
181
}
182
183
ret = (int)TEMP_FAILURE_RETRY(close(fd));
184
if(ret == -1){
185
perror("close");
186
}
187
gpgme_data_release(pgp_data);
188
return true;
189
}
190
191
if(debug){
192
fprintf(stderr, "Initialize gpgme\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
193
152
}
194
153
195
154
/* Init GPGME */
196
155
gpgme_check_version(NULL);
197
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
198
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
199
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
200
159
gpgme_strsource(rc), gpgme_strerror(rc));
201
return false;
160
return -1;
202
161
}
203
162
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){
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){
207
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
208
167
gpgme_strsource(rc), gpgme_strerror(rc));
209
return false;
168
return -1;
210
169
}
211
170
while(engine_info != NULL){
212
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
213
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
214
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
215
174
break;
216
175
}
217
176
engine_info = engine_info->next;
218
177
}
219
178
if(engine_info == NULL){
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");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
255
181
}
256
182
257
183
/* Create new GPGME data buffer from memory cryptotext */
258
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
259
185
0);
260
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
261
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
262
188
gpgme_strsource(rc), gpgme_strerror(rc));
263
189
return -1;
265
191
266
192
/* Create new empty GPGME data buffer for the plaintext */
267
193
rc = gpgme_data_new(&dh_plain);
268
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
269
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
270
196
gpgme_strsource(rc), gpgme_strerror(rc));
271
197
gpgme_data_release(dh_crypto);
272
198
return -1;
273
199
}
274
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
275
210
/* Decrypt data from the cryptotext data buffer to the plaintext
276
211
data buffer */
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
278
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
279
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
280
215
gpgme_strsource(rc), gpgme_strerror(rc));
281
216
plaintext_length = -1;
282
if(debug){
217
if (debug){
283
218
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
285
if(result == NULL){
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
286
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
287
222
} else {
288
223
fprintf(stderr, "Unsupported algorithm: %s\n",
315
250
}
316
251
317
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
318
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
319
perror("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
320
255
plaintext_length = -1;
321
256
goto decrypt_end;
322
257
}
326
261
plaintext_capacity = adjustbuffer(plaintext,
327
262
(size_t)plaintext_length,
328
263
plaintext_capacity);
329
if(plaintext_capacity == 0){
264
if (plaintext_capacity == 0){
330
265
perror("adjustbuffer");
331
266
plaintext_length = -1;
332
267
goto decrypt_end;
335
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
336
271
BUFFER_SIZE);
337
272
/* Print the data, if any */
338
if(ret == 0){
273
if (ret == 0){
339
274
/* EOF */
340
275
break;
341
276
}
346
281
}
347
282
plaintext_length += ret;
348
283
}
349
284
350
285
if(debug){
351
286
fprintf(stderr, "Decrypted password is: ");
352
287
for(ssize_t i = 0; i < plaintext_length; i++){
365
300
return plaintext_length;
366
301
}
367
302
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)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
372
306
ret = "(unknown)";
373
307
return ret;
374
308
}
389
323
}
390
324
391
325
ret = gnutls_global_init();
392
if(ret != GNUTLS_E_SUCCESS) {
393
fprintf(stderr, "GnuTLS global_init: %s\n",
394
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
395
329
return -1;
396
330
}
397
331
398
if(debug){
332
if (debug){
399
333
/* "Use a log level over 10 to enable all debugging options."
400
334
* - GnuTLS manual
401
335
*/
405
339
406
340
/* OpenPGP credentials */
407
341
gnutls_certificate_allocate_credentials(&mc->cred);
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();
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 ();
415
347
return -1;
416
348
}
417
349
418
350
if(debug){
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" 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,
421
353
seckeyfilename);
422
354
}
423
355
424
356
ret = gnutls_certificate_set_openpgp_key_file
425
357
(mc->cred, pubkeyfilename, seckeyfilename,
426
358
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
359
if (ret != GNUTLS_E_SUCCESS) {
428
360
fprintf(stderr,
429
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
432
364
safer_gnutls_strerror(ret));
433
365
goto globalfail;
434
366
}
435
367
436
368
/* GnuTLS server initialization */
437
369
ret = gnutls_dh_params_init(&mc->dh_params);
438
if(ret != GNUTLS_E_SUCCESS) {
439
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
" %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));
441
373
goto globalfail;
442
374
}
443
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
444
if(ret != GNUTLS_E_SUCCESS) {
445
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
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));
447
379
goto globalfail;
448
380
}
449
381
450
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
451
383
452
384
return 0;
453
385
454
386
globalfail:
455
387
456
388
gnutls_certificate_free_credentials(mc->cred);
457
389
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
459
390
return -1;
391
460
392
}
461
393
462
394
static int init_gnutls_session(mandos_context *mc,
464
396
int ret;
465
397
/* GnuTLS session creation */
466
398
ret = gnutls_init(session, GNUTLS_SERVER);
467
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
468
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
469
401
safer_gnutls_strerror(ret));
470
402
}
472
404
{
473
405
const char *err;
474
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
407
if (ret != GNUTLS_E_SUCCESS) {
476
408
fprintf(stderr, "Syntax error at: %s\n", err);
477
409
fprintf(stderr, "GnuTLS error: %s\n",
478
410
safer_gnutls_strerror(ret));
479
gnutls_deinit(*session);
411
gnutls_deinit (*session);
480
412
return -1;
481
413
}
482
414
}
483
415
484
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
417
mc->cred);
486
if(ret != GNUTLS_E_SUCCESS) {
418
if (ret != GNUTLS_E_SUCCESS) {
487
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
488
420
safer_gnutls_strerror(ret));
489
gnutls_deinit(*session);
421
gnutls_deinit (*session);
490
422
return -1;
491
423
}
492
424
493
425
/* ignore client certificate if any. */
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
496
428
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
498
430
499
431
return 0;
500
432
}
508
440
AvahiIfIndex if_index,
509
441
mandos_context *mc){
510
442
int ret, tcp_sd;
511
ssize_t sret;
512
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
513
444
char *buffer = NULL;
514
445
char *decrypted_buffer;
520
451
char interface[IF_NAMESIZE];
521
452
gnutls_session_t session;
522
453
523
ret = init_gnutls_session(mc, &session);
524
if(ret != 0){
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
525
456
return -1;
526
457
}
527
458
535
466
perror("socket");
536
467
return -1;
537
468
}
538
469
539
470
if(debug){
540
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
541
472
perror("if_indextoname");
549
480
/* It would be nice to have a way to detect if we were passed an
550
481
IPv4 address here. Now we assume an IPv6 address. */
551
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
552
if(ret < 0 ){
483
if (ret < 0 ){
553
484
perror("inet_pton");
554
485
return -1;
555
486
}
557
488
fprintf(stderr, "Bad address: %s\n", ip);
558
489
return -1;
559
490
}
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
561
-Wconversion and
562
-Wunreachable-code */
491
to.in6.sin6_port = htons(port); /* Spurious warning */
563
492
564
493
to.in6.sin6_scope_id = (uint32_t)if_index;
565
494
578
507
}
579
508
580
509
ret = connect(tcp_sd, &to.in, sizeof(to));
581
if(ret < 0){
510
if (ret < 0){
582
511
perror("connect");
583
512
return -1;
584
513
}
585
514
586
515
const char *out = mandos_protocol_version;
587
516
written = 0;
588
while(true){
517
while (true){
589
518
size_t out_size = strlen(out);
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
591
520
out_size - written));
592
if(ret == -1){
521
if (ret == -1){
593
522
perror("write");
594
523
retval = -1;
595
524
goto mandos_end;
598
527
if(written < out_size){
599
528
continue;
600
529
} else {
601
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
602
531
written = 0;
603
532
out = "\r\n";
604
533
} else {
606
535
}
607
536
}
608
537
}
609
538
610
539
if(debug){
611
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
612
541
}
613
542
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
616
545
do{
617
ret = gnutls_handshake(session);
546
ret = gnutls_handshake (session);
618
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
619
548
620
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
621
550
if(debug){
622
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
623
gnutls_perror(ret);
552
gnutls_perror (ret);
624
553
}
625
554
retval = -1;
626
555
goto mandos_end;
632
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
633
562
ip);
634
563
}
635
564
636
565
while(true){
637
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
638
567
buffer_capacity);
639
if(buffer_capacity == 0){
568
if (buffer_capacity == 0){
640
569
perror("adjustbuffer");
641
570
retval = -1;
642
571
goto mandos_end;
643
572
}
644
573
645
sret = gnutls_record_recv(session, buffer+buffer_length,
646
BUFFER_SIZE);
647
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
648
577
break;
649
578
}
650
if(sret < 0){
651
switch(sret){
579
if (ret < 0){
580
switch(ret){
652
581
case GNUTLS_E_INTERRUPTED:
653
582
case GNUTLS_E_AGAIN:
654
583
break;
655
584
case GNUTLS_E_REHANDSHAKE:
656
585
do{
657
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
658
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
659
if(ret < 0){
588
if (ret < 0){
660
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
661
gnutls_perror(ret);
590
gnutls_perror (ret);
662
591
retval = -1;
663
592
goto mandos_end;
664
593
}
667
596
fprintf(stderr, "Unknown error while reading data from"
668
597
" encrypted session with Mandos server\n");
669
598
retval = -1;
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
671
600
goto mandos_end;
672
601
}
673
602
} else {
674
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
675
604
}
676
605
}
677
606
679
608
fprintf(stderr, "Closing TLS session\n");
680
609
}
681
610
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
683
612
684
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
686
615
buffer_length,
687
&decrypted_buffer);
688
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
689
619
written = 0;
690
620
while(written < (size_t) decrypted_buffer_size){
691
ret = (int)fwrite(decrypted_buffer + written, 1,
692
(size_t)decrypted_buffer_size - written,
693
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
694
624
if(ret == 0 and ferror(stdout)){
695
625
if(debug){
696
626
fprintf(stderr, "Error writing encrypted data: %s\n",
713
643
714
644
mandos_end:
715
645
free(buffer);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
719
}
720
gnutls_deinit(session);
646
close(tcp_sd);
647
gnutls_deinit (session);
721
648
return retval;
722
649
}
723
650
741
668
/* Called whenever a service has been resolved successfully or
742
669
timed out */
743
670
744
switch(event) {
671
switch (event) {
745
672
default:
746
673
case AVAHI_RESOLVER_FAILURE:
747
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
755
682
avahi_address_snprint(ip, sizeof(ip), address);
756
683
if(debug){
757
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
ip, (intmax_t)interface, port);
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
760
687
}
761
688
int ret = start_mandos_communication(ip, port, interface, mc);
762
if(ret == 0){
689
if (ret == 0){
763
690
avahi_simple_poll_quit(mc->simple_poll);
764
691
}
765
692
}
783
710
/* Called whenever a new services becomes available on the LAN or
784
711
is removed from the LAN */
785
712
786
switch(event) {
713
switch (event) {
787
714
default:
788
715
case AVAHI_BROWSER_FAILURE:
789
716
798
725
the callback function is called the Avahi server will free the
799
726
resolver for us. */
800
727
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
802
729
protocol, name, type, domain,
803
730
AVAHI_PROTO_INET6, 0,
804
731
resolve_callback, mc)))
818
745
}
819
746
}
820
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
821
760
int main(int argc, char *argv[]){
822
761
AvahiSServiceBrowser *sb = NULL;
823
762
int error;
824
763
int ret;
825
intmax_t tmpmax;
826
int numchars;
827
764
int exitcode = EXIT_SUCCESS;
828
765
const char *interface = "eth0";
829
766
struct ifreq network;
831
768
uid_t uid;
832
769
gid_t gid;
833
770
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
838
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
839
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
840
.dh_bits = 1024, .priority = "SECURE256"
841
":!CTYPE-X.509:+CTYPE-OPENPGP" };
842
bool gnutls_initialized = false;
843
bool gpgme_initialized = false;
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
844
779
845
780
{
846
781
struct argp_option options[] = {
847
782
{ .name = "debug", .key = 128,
848
783
.doc = "Debug mode", .group = 3 },
849
784
{ .name = "connect", .key = 'c',
850
.arg = "ADDRESS:PORT",
851
.doc = "Connect directly to a specific Mandos server",
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
852
787
.group = 1 },
853
788
{ .name = "interface", .key = 'i',
854
.arg = "NAME",
855
.doc = "Interface that will be used to search for Mandos"
856
" 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",
857
795
.group = 1 },
858
796
{ .name = "seckey", .key = 's',
859
.arg = "FILE",
860
.doc = "OpenPGP secret key file base name",
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
861
799
.group = 1 },
862
800
{ .name = "pubkey", .key = 'p',
863
.arg = "FILE",
864
.doc = "OpenPGP public key file base name",
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
865
803
.group = 2 },
866
804
{ .name = "dh-bits", .key = 129,
867
805
.arg = "BITS",
868
.doc = "Bit length of the prime number used in the"
869
" Diffie-Hellman key exchange",
806
.doc = "dh-bits to use in gnutls communication",
870
807
.group = 2 },
871
808
{ .name = "priority", .key = 130,
872
.arg = "STRING",
873
.doc = "GnuTLS priority string for the TLS handshake",
874
.group = 1 },
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
875
811
{ .name = NULL }
876
812
};
813
877
814
878
error_t parse_opt(int key, char *arg,
879
struct argp_state *state) {
880
switch(key) {
881
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:
882
821
debug = true;
883
822
break;
884
case 'c': /* --connect */
823
case 'c':
885
824
connect_to = arg;
886
825
break;
887
case 'i': /* --interface */
826
case 'i':
888
827
interface = arg;
889
828
break;
890
case 's': /* --seckey */
891
seckey = arg;
892
break;
893
case 'p': /* --pubkey */
894
pubkey = arg;
895
break;
896
case 129: /* --dh-bits */
897
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
898
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
899
or arg[numchars] != '\0'){
900
fprintf(stderr, "Bad number of DH bits\n");
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");
901
843
exit(EXIT_FAILURE);
902
844
}
903
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
904
845
break;
905
case 130: /* --priority */
846
case 130:
906
847
mc.priority = arg;
907
848
break;
908
849
case ARGP_KEY_ARG:
909
argp_usage(state);
850
argp_usage (state);
910
851
case ARGP_KEY_END:
911
852
break;
912
853
default:
914
855
}
915
856
return 0;
916
857
}
917
858
918
859
struct argp argp = { .options = options, .parser = parse_opt,
919
860
.args_doc = "",
920
861
.doc = "Mandos client -- Get and decrypt"
921
" passwords from a Mandos server" };
922
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
923
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){
924
865
fprintf(stderr, "Unknown error while parsing arguments\n");
925
866
exitcode = EXIT_FAILURE;
926
867
goto end;
927
868
}
928
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
}
929
893
930
894
/* If the interface is down, bring it up */
931
895
{
951
915
goto end;
952
916
}
953
917
}
954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
955
if(ret == -1){
956
perror("close");
957
}
918
close(sd);
958
919
}
959
920
960
921
uid = getuid();
961
922
gid = getgid();
962
923
963
924
ret = setuid(uid);
964
if(ret == -1){
925
if (ret == -1){
965
926
perror("setuid");
966
927
}
967
928
968
929
setgid(gid);
969
if(ret == -1){
930
if (ret == -1){
970
931
perror("setgid");
971
932
}
972
933
973
ret = init_gnutls_global(&mc, pubkey, seckey);
974
if(ret == -1){
975
fprintf(stderr, "init_gnutls_global failed\n");
976
exitcode = EXIT_FAILURE;
977
goto end;
978
} else {
979
gnutls_initialized = true;
980
}
981
982
if(mkdtemp(tempdir) == NULL){
983
perror("mkdtemp");
984
tempdir[0] = '\0';
985
goto end;
986
}
987
988
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
989
fprintf(stderr, "init_gpgme failed\n");
990
exitcode = EXIT_FAILURE;
991
goto end;
992
} else {
993
gpgme_initialized = true;
994
}
995
996
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
997
935
if(if_index == 0){
998
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1008
946
exitcode = EXIT_FAILURE;
1009
947
goto end;
1010
948
}
1011
uint16_t port;
1012
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1013
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1014
or address[numchars+1] != '\0'){
1015
fprintf(stderr, "Bad port number\n");
949
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
1016
953
exitcode = EXIT_FAILURE;
1017
954
goto end;
1018
955
}
1019
port = (uint16_t)tmpmax;
1020
956
*address = '\0';
1021
957
address = connect_to;
1022
958
ret = start_mandos_communication(address, port, if_index, &mc);
1028
964
goto end;
1029
965
}
1030
966
1031
if(not debug){
967
if (not debug){
1032
968
avahi_set_log_function(empty_log);
1033
969
}
1034
970
1037
973
1038
974
/* Allocate main Avahi loop object */
1039
975
mc.simple_poll = avahi_simple_poll_new();
1040
if(mc.simple_poll == NULL) {
976
if (mc.simple_poll == NULL) {
1041
977
fprintf(stderr, "Avahi: Failed to create simple poll"
1042
978
" object.\n");
1043
979
exitcode = EXIT_FAILURE;
1044
980
goto end;
1045
981
}
1046
982
1047
983
{
1048
984
AvahiServerConfig config;
1049
985
/* Do not publish any local Zeroconf records */
1052
988
config.publish_addresses = 0;
1053
989
config.publish_workstation = 0;
1054
990
config.publish_domain = 0;
1055
991
1056
992
/* Allocate a new server */
1057
993
mc.server = avahi_server_new(avahi_simple_poll_get
1058
994
(mc.simple_poll), &config, NULL,
1059
995
NULL, &error);
1060
996
1061
997
/* Free the Avahi configuration data */
1062
998
avahi_server_config_free(&config);
1063
999
}
1064
1000
1065
1001
/* Check if creating the Avahi server object succeeded */
1066
if(mc.server == NULL) {
1002
if (mc.server == NULL) {
1067
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1068
1004
avahi_strerror(error));
1069
1005
exitcode = EXIT_FAILURE;
1075
1011
AVAHI_PROTO_INET6,
1076
1012
"_mandos._tcp", NULL, 0,
1077
1013
browse_callback, &mc);
1078
if(sb == NULL) {
1014
if (sb == NULL) {
1079
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1080
1016
avahi_strerror(avahi_server_errno(mc.server)));
1081
1017
exitcode = EXIT_FAILURE;
1083
1019
}
1084
1020
1085
1021
/* Run the main loop */
1086
1087
if(debug){
1022
1023
if (debug){
1088
1024
fprintf(stderr, "Starting Avahi loop search\n");
1089
1025
}
1090
1026
1091
1027
avahi_simple_poll_loop(mc.simple_poll);
1092
1028
1093
1029
end:
1094
1095
if(debug){
1030
1031
if (debug){
1096
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1097
1033
}
1098
1034
1099
1035
/* Cleanup things */
1100
if(sb != NULL)
1036
if (sb != NULL)
1101
1037
avahi_s_service_browser_free(sb);
1102
1038
1103
if(mc.server != NULL)
1039
if (mc.server != NULL)
1104
1040
avahi_server_free(mc.server);
1105
1106
if(mc.simple_poll != NULL)
1041
1042
if (mc.simple_poll != NULL)
1107
1043
avahi_simple_poll_free(mc.simple_poll);
1108
1109
if(gnutls_initialized){
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1110
1048
gnutls_certificate_free_credentials(mc.cred);
1111
gnutls_global_deinit();
1112
gnutls_dh_params_deinit(mc.dh_params);
1113
}
1114
1115
if(gpgme_initialized){
1116
gpgme_release(mc.ctx);
1117
}
1118
1119
/* Removes the temp directory used by GPGME */
1120
if(tempdir[0] != '\0'){
1121
DIR *d;
1122
struct dirent *direntry;
1123
d = opendir(tempdir);
1124
if(d == NULL){
1125
if(errno != ENOENT){
1126
perror("opendir");
1127
}
1128
} else {
1129
while(true){
1130
direntry = readdir(d);
1131
if(direntry == NULL){
1132
break;
1133
}
1134
/* Skip "." and ".." */
1135
if(direntry->d_name[0] == '.'
1136
and (direntry->d_name[1] == '\0'
1137
or (direntry->d_name[1] == '.'
1138
and direntry->d_name[2] == '\0'))){
1139
continue;
1140
}
1141
char *fullname = NULL;
1142
ret = asprintf(&fullname, "%s/%s", tempdir,
1143
direntry->d_name);
1144
if(ret < 0){
1145
perror("asprintf");
1146
continue;
1147
}
1148
ret = remove(fullname);
1149
if(ret == -1){
1150
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1151
strerror(errno));
1152
}
1153
free(fullname);
1154
}
1155
closedir(d);
1156
}
1157
ret = rmdir(tempdir);
1158
if(ret == -1 and errno != ENOENT){
1159
perror("rmdir");
1160
}
1049
gnutls_global_deinit ();
1161
1050
}
1162
1051
1163
1052
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0