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- Committer: Teddy Hogeborn
- Date: 2008-08-17 22:42:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080817224228-nhor2yuv230if01i
* Makefile (DOCBOOKTOMAN): Use the local manpages/docbook.xsl file, do
not rely on a stylesheet declaration.
* mandos.xml: Removed <?xml-stylesheet>. New entity "&OVERVIEW;"
refers to "overview.xml". Changed all single quotes to
double quotes for consistency.
(DESCRIPTION): Use the term "TLS" and not "GnuTLS" for the protocol.
Refer to the "OVERVIEW" section for reason for IPv6
link-local addresses.
(PURPOSE): Shortened a lot. Refer to "OVERVIEW" section for details.
(OVERVIEW): New section. Include &OVERVIEW; and add a paragraph
about what the role of this program is.
(SECURITY/CLIENTS): Refer to the "CHECKING" section for details on
checking.
(SEE ALSO): Changed from an <itemizedlist> to a <variablelist>.
Added a short text for each entry. Removed reference to
plugin-runner(8mandos). Add reference to RFC 4291 and
RFC 4346.
* overview.xml: New file, containing a single <para>. The idea is to
use this in all the man pages.
* plugins.d/password-request.c: Updated comments about spurious
warnings.
not rely on a stylesheet declaration.
* mandos.xml: Removed <?xml-stylesheet>. New entity "&OVERVIEW;"
refers to "overview.xml". Changed all single quotes to
double quotes for consistency.
(DESCRIPTION): Use the term "TLS" and not "GnuTLS" for the protocol.
Refer to the "OVERVIEW" section for reason for IPv6
link-local addresses.
(PURPOSE): Shortened a lot. Refer to "OVERVIEW" section for details.
(OVERVIEW): New section. Include &OVERVIEW; and add a paragraph
about what the role of this program is.
(SECURITY/CLIENTS): Refer to the "CHECKING" section for details on
checking.
(SEE ALSO): Changed from an <itemizedlist> to a <variablelist>.
Added a short text for each entry. Removed reference to
plugin-runner(8mandos). Add reference to RFC 4291 and
RFC 4346.
* overview.xml: New file, containing a single <para>. The idea is to
use this in all the man pages.
* plugins.d/password-request.c: Updated comments about spurious
warnings.
- 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 */
38
stdout, ferror() */
40
39
#include <stdint.h> /* uint16_t, uint32_t */
41
40
#include <stddef.h> /* NULL, size_t, ssize_t */
42
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
48
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
48
sockaddr_in6, PF_INET6,
50
49
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
53
struct in6_addr, inet_pton(),
56
54
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
61
55
#include <assert.h> /* assert() */
62
56
#include <errno.h> /* perror(), errno */
63
57
#include <time.h> /* time() */
64
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
59
SIOCSIFFLAGS, if_indextoname(),
66
60
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
68
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
62
getuid(), getgid(), setuid(),
70
63
setgid() */
64
#include <netinet/in.h>
71
65
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
66
#include <iso646.h> /* not, and */
73
67
#include <argp.h> /* struct argp_option, error_t, struct
74
68
argp_state, struct argp,
75
69
argp_parse(), ARGP_KEY_ARG,
92
86
gnutls_*
93
87
init_gnutls_session(),
94
88
GNUTLS_* */
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
97
90
GNUTLS_OPENPGP_FMT_BASE64 */
98
91
99
92
/* GPGME */
105
98
106
99
#define BUFFER_SIZE 256
107
100
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
112
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
113
103
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
115
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
106
117
107
/* Used for passing in values through the Avahi callback functions */
122
112
unsigned int dh_bits;
123
113
gnutls_dh_params_t dh_params;
124
114
const char *priority;
125
gpgme_ctx_t ctx;
126
115
} mandos_context;
127
116
128
117
/*
132
121
*/
133
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
123
size_t buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
126
if (buffer == NULL){
138
127
return 0;
139
128
}
140
129
buffer_capacity += BUFFER_SIZE;
143
132
}
144
133
145
134
/*
146
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
147
137
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
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;
151
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
152
148
gpgme_engine_info_t engine_info;
153
149
154
155
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
157
*/
158
bool import_key(const char *filename){
159
int fd;
160
gpgme_data_t pgp_data;
161
162
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
if(fd == -1){
164
perror("open");
165
return false;
166
}
167
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if(rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if(rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
if(ret == -1){
184
perror("close");
185
}
186
gpgme_data_release(pgp_data);
187
return true;
188
}
189
190
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
152
}
193
153
194
154
/* Init GPGME */
195
155
gpgme_check_version(NULL);
196
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
198
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
159
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
160
return -1;
201
161
}
202
162
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info(&engine_info);
205
if(rc != GPG_ERR_NO_ERROR){
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){
206
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
167
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
168
return -1;
209
169
}
210
170
while(engine_info != NULL){
211
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
214
174
break;
215
175
}
216
176
engine_info = engine_info->next;
217
177
}
218
178
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
return false;
221
}
222
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if(not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
236
}
237
238
/*
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
241
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
246
gpgme_data_t dh_crypto, dh_plain;
247
gpgme_error_t rc;
248
ssize_t ret;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
251
252
if(debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
254
181
}
255
182
256
183
/* Create new GPGME data buffer from memory cryptotext */
257
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
185
0);
259
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
260
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
188
gpgme_strsource(rc), gpgme_strerror(rc));
262
189
return -1;
264
191
265
192
/* Create new empty GPGME data buffer for the plaintext */
266
193
rc = gpgme_data_new(&dh_plain);
267
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
268
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
196
gpgme_strsource(rc), gpgme_strerror(rc));
270
197
gpgme_data_release(dh_crypto);
271
198
return -1;
272
199
}
273
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
274
210
/* Decrypt data from the cryptotext data buffer to the plaintext
275
211
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
278
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
215
gpgme_strsource(rc), gpgme_strerror(rc));
280
216
plaintext_length = -1;
281
if(debug){
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if(result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
293
}
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
306
}
307
}
308
}
309
217
goto decrypt_end;
310
218
}
311
219
313
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
222
}
315
223
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
316
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
319
256
plaintext_length = -1;
320
257
goto decrypt_end;
321
258
}
325
262
plaintext_capacity = adjustbuffer(plaintext,
326
263
(size_t)plaintext_length,
327
264
plaintext_capacity);
328
if(plaintext_capacity == 0){
265
if (plaintext_capacity == 0){
329
266
perror("adjustbuffer");
330
267
plaintext_length = -1;
331
268
goto decrypt_end;
334
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
272
BUFFER_SIZE);
336
273
/* Print the data, if any */
337
if(ret == 0){
274
if (ret == 0){
338
275
/* EOF */
339
276
break;
340
277
}
345
282
}
346
283
plaintext_length += ret;
347
284
}
348
285
349
286
if(debug){
350
287
fprintf(stderr, "Decrypted password is: ");
351
288
for(ssize_t i = 0; i < plaintext_length; i++){
364
301
return plaintext_length;
365
302
}
366
303
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
-Wunreachable-code */
370
if(ret == NULL)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
371
307
ret = "(unknown)";
372
308
return ret;
373
309
}
388
324
}
389
325
390
326
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
394
330
return -1;
395
331
}
396
332
397
if(debug){
333
if (debug){
398
334
/* "Use a log level over 10 to enable all debugging options."
399
335
* - GnuTLS manual
400
336
*/
404
340
405
341
/* OpenPGP credentials */
406
342
gnutls_certificate_allocate_credentials(&mc->cred);
407
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
412
safer_gnutls_strerror(ret));
413
gnutls_global_deinit();
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
warning */
346
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
414
348
return -1;
415
349
}
416
350
417
351
if(debug){
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
420
354
seckeyfilename);
421
355
}
422
356
423
357
ret = gnutls_certificate_set_openpgp_key_file
424
358
(mc->cred, pubkeyfilename, seckeyfilename,
425
359
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
360
if (ret != GNUTLS_E_SUCCESS) {
427
361
fprintf(stderr,
428
362
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
363
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
364
fprintf(stdout, "The GnuTLS error is: %s\n",
431
365
safer_gnutls_strerror(ret));
432
366
goto globalfail;
433
367
}
434
368
435
369
/* GnuTLS server initialization */
436
370
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
440
374
goto globalfail;
441
375
}
442
376
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
446
380
goto globalfail;
447
381
}
448
382
449
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
450
384
451
385
return 0;
452
386
453
387
globalfail:
454
388
455
389
gnutls_certificate_free_credentials(mc->cred);
456
390
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
458
391
return -1;
392
459
393
}
460
394
461
395
static int init_gnutls_session(mandos_context *mc,
463
397
int ret;
464
398
/* GnuTLS session creation */
465
399
ret = gnutls_init(session, GNUTLS_SERVER);
466
if(ret != GNUTLS_E_SUCCESS){
400
if (ret != GNUTLS_E_SUCCESS){
467
401
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
402
safer_gnutls_strerror(ret));
469
403
}
471
405
{
472
406
const char *err;
473
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
408
if (ret != GNUTLS_E_SUCCESS) {
475
409
fprintf(stderr, "Syntax error at: %s\n", err);
476
410
fprintf(stderr, "GnuTLS error: %s\n",
477
411
safer_gnutls_strerror(ret));
478
gnutls_deinit(*session);
412
gnutls_deinit (*session);
479
413
return -1;
480
414
}
481
415
}
482
416
483
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
418
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
419
if (ret != GNUTLS_E_SUCCESS) {
486
420
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
421
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
422
gnutls_deinit (*session);
489
423
return -1;
490
424
}
491
425
492
426
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
495
429
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
431
498
432
return 0;
499
433
}
507
441
AvahiIfIndex if_index,
508
442
mandos_context *mc){
509
443
int ret, tcp_sd;
510
ssize_t sret;
511
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
512
445
char *buffer = NULL;
513
446
char *decrypted_buffer;
519
452
char interface[IF_NAMESIZE];
520
453
gnutls_session_t session;
521
454
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
524
457
return -1;
525
458
}
526
459
534
467
perror("socket");
535
468
return -1;
536
469
}
537
470
538
471
if(debug){
539
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
473
perror("if_indextoname");
548
481
/* It would be nice to have a way to detect if we were passed an
549
482
IPv4 address here. Now we assume an IPv6 address. */
550
483
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
551
if(ret < 0 ){
484
if (ret < 0 ){
552
485
perror("inet_pton");
553
486
return -1;
554
487
}
556
489
fprintf(stderr, "Bad address: %s\n", ip);
557
490
return -1;
558
491
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
492
to.in6.sin6_port = htons(port); /* Spurious warning */
562
493
563
494
to.in6.sin6_scope_id = (uint32_t)if_index;
564
495
577
508
}
578
509
579
510
ret = connect(tcp_sd, &to.in, sizeof(to));
580
if(ret < 0){
511
if (ret < 0){
581
512
perror("connect");
582
513
return -1;
583
514
}
584
515
585
516
const char *out = mandos_protocol_version;
586
517
written = 0;
587
while(true){
518
while (true){
588
519
size_t out_size = strlen(out);
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
521
out_size - written));
591
if(ret == -1){
522
if (ret == -1){
592
523
perror("write");
593
524
retval = -1;
594
525
goto mandos_end;
597
528
if(written < out_size){
598
529
continue;
599
530
} else {
600
if(out == mandos_protocol_version){
531
if (out == mandos_protocol_version){
601
532
written = 0;
602
533
out = "\r\n";
603
534
} else {
605
536
}
606
537
}
607
538
}
608
539
609
540
if(debug){
610
541
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
542
}
612
543
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
615
546
do{
616
ret = gnutls_handshake(session);
547
ret = gnutls_handshake (session);
617
548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
549
619
if(ret != GNUTLS_E_SUCCESS){
550
if (ret != GNUTLS_E_SUCCESS){
620
551
if(debug){
621
552
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
622
gnutls_perror(ret);
553
gnutls_perror (ret);
623
554
}
624
555
retval = -1;
625
556
goto mandos_end;
631
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
632
563
ip);
633
564
}
634
565
635
566
while(true){
636
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
568
buffer_capacity);
638
if(buffer_capacity == 0){
569
if (buffer_capacity == 0){
639
570
perror("adjustbuffer");
640
571
retval = -1;
641
572
goto mandos_end;
642
573
}
643
574
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
577
if (ret == 0){
647
578
break;
648
579
}
649
if(sret < 0){
650
switch(sret){
580
if (ret < 0){
581
switch(ret){
651
582
case GNUTLS_E_INTERRUPTED:
652
583
case GNUTLS_E_AGAIN:
653
584
break;
654
585
case GNUTLS_E_REHANDSHAKE:
655
586
do{
656
ret = gnutls_handshake(session);
587
ret = gnutls_handshake (session);
657
588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
if(ret < 0){
589
if (ret < 0){
659
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
660
gnutls_perror(ret);
591
gnutls_perror (ret);
661
592
retval = -1;
662
593
goto mandos_end;
663
594
}
666
597
fprintf(stderr, "Unknown error while reading data from"
667
598
" encrypted session with Mandos server\n");
668
599
retval = -1;
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
601
goto mandos_end;
671
602
}
672
603
} else {
673
buffer_length += (size_t) sret;
604
buffer_length += (size_t) ret;
674
605
}
675
606
}
676
607
678
609
fprintf(stderr, "Closing TLS session\n");
679
610
}
680
611
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
613
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
614
if (buffer_length > 0){
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
616
buffer_length,
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
688
620
written = 0;
689
621
while(written < (size_t) decrypted_buffer_size){
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
693
625
if(ret == 0 and ferror(stdout)){
694
626
if(debug){
695
627
fprintf(stderr, "Error writing encrypted data: %s\n",
704
636
} else {
705
637
retval = -1;
706
638
}
707
} else {
708
retval = -1;
709
639
}
710
640
711
641
/* Shutdown procedure */
712
642
713
643
mandos_end:
714
644
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
645
close(tcp_sd);
646
gnutls_deinit (session);
720
647
return retval;
721
648
}
722
649
740
667
/* Called whenever a service has been resolved successfully or
741
668
timed out */
742
669
743
switch(event) {
670
switch (event) {
744
671
default:
745
672
case AVAHI_RESOLVER_FAILURE:
746
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
754
681
avahi_address_snprint(ip, sizeof(ip), address);
755
682
if(debug){
756
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
759
686
}
760
687
int ret = start_mandos_communication(ip, port, interface, mc);
761
if(ret == 0){
688
if (ret == 0){
762
689
avahi_simple_poll_quit(mc->simple_poll);
763
690
}
764
691
}
782
709
/* Called whenever a new services becomes available on the LAN or
783
710
is removed from the LAN */
784
711
785
switch(event) {
712
switch (event) {
786
713
default:
787
714
case AVAHI_BROWSER_FAILURE:
788
715
797
724
the callback function is called the Avahi server will free the
798
725
resolver for us. */
799
726
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
728
protocol, name, type, domain,
802
729
AVAHI_PROTO_INET6, 0,
803
730
resolve_callback, mc)))
817
744
}
818
745
}
819
746
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
756
}
757
758
820
759
int main(int argc, char *argv[]){
821
760
AvahiSServiceBrowser *sb = NULL;
822
761
int error;
823
762
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
763
int exitcode = EXIT_SUCCESS;
827
764
const char *interface = "eth0";
828
765
struct ifreq network;
830
767
uid_t uid;
831
768
gid_t gid;
832
769
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
838
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
841
bool gnutls_initialized = false;
842
bool gpgme_initialized = false;
776
.dh_bits = 1024, .priority = "SECURE256"};
777
bool gnutls_initalized = false;
843
778
844
779
{
845
780
struct argp_option options[] = {
846
781
{ .name = "debug", .key = 128,
847
782
.doc = "Debug mode", .group = 3 },
848
783
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
784
.arg = "IP",
785
.doc = "Connect directly to a sepcified mandos server",
851
786
.group = 1 },
852
787
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
788
.arg = "INTERFACE",
789
.doc = "Interface that Avahi will conntect through",
790
.group = 1 },
791
{ .name = "keydir", .key = 'd',
792
.arg = "KEYDIR",
793
.doc = "Directory where the openpgp keyring is",
856
794
.group = 1 },
857
795
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
796
.arg = "SECKEY",
797
.doc = "Secret openpgp key for gnutls authentication",
860
798
.group = 1 },
861
799
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
800
.arg = "PUBKEY",
801
.doc = "Public openpgp key for gnutls authentication",
864
802
.group = 2 },
865
803
{ .name = "dh-bits", .key = 129,
866
804
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
805
.doc = "dh-bits to use in gnutls communication",
869
806
.group = 2 },
870
807
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
808
.arg = "PRIORITY",
809
.doc = "GNUTLS priority", .group = 1 },
874
810
{ .name = NULL }
875
811
};
812
876
813
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
814
error_t parse_opt (int key, char *arg,
815
struct argp_state *state) {
816
/* Get the INPUT argument from `argp_parse', which we know is
817
a pointer to our plugin list pointer. */
818
switch (key) {
819
case 128:
881
820
debug = true;
882
821
break;
883
case 'c': /* --connect */
822
case 'c':
884
823
connect_to = arg;
885
824
break;
886
case 'i': /* --interface */
825
case 'i':
887
826
interface = arg;
888
827
break;
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
828
case 'd':
829
keydir = arg;
830
break;
831
case 's':
832
seckeyname = arg;
833
break;
834
case 'p':
835
pubkeyname = arg;
836
break;
837
case 129:
838
errno = 0;
839
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
840
if (errno){
841
perror("strtol");
900
842
exit(EXIT_FAILURE);
901
843
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
844
break;
904
case 130: /* --priority */
845
case 130:
905
846
mc.priority = arg;
906
847
break;
907
848
case ARGP_KEY_ARG:
908
argp_usage(state);
849
argp_usage (state);
909
850
case ARGP_KEY_END:
910
851
break;
911
852
default:
913
854
}
914
855
return 0;
915
856
}
916
857
917
858
struct argp argp = { .options = options, .parser = parse_opt,
918
859
.args_doc = "",
919
860
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
923
864
fprintf(stderr, "Unknown error while parsing arguments\n");
924
865
exitcode = EXIT_FAILURE;
925
866
goto end;
926
867
}
927
868
}
869
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
874
goto end;
875
}
876
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
881
goto end;
882
}
883
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
if (ret == -1){
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
} else {
890
gnutls_initalized = true;
891
}
928
892
929
893
/* If the interface is down, bring it up */
930
894
{
950
914
goto end;
951
915
}
952
916
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
917
close(sd);
957
918
}
958
919
959
920
uid = getuid();
960
921
gid = getgid();
961
922
962
923
ret = setuid(uid);
963
if(ret == -1){
924
if (ret == -1){
964
925
perror("setuid");
965
926
}
966
927
967
928
setgid(gid);
968
if(ret == -1){
929
if (ret == -1){
969
930
perror("setgid");
970
931
}
971
932
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initialized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "init_gpgme failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initialized = true;
993
}
994
995
933
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
934
if(if_index == 0){
997
935
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1007
945
exitcode = EXIT_FAILURE;
1008
946
goto end;
1009
947
}
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
948
errno = 0;
949
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
950
if(errno){
951
perror("Bad port number");
1015
952
exitcode = EXIT_FAILURE;
1016
953
goto end;
1017
954
}
1018
port = (uint16_t)tmpmax;
1019
955
*address = '\0';
1020
956
address = connect_to;
1021
957
ret = start_mandos_communication(address, port, if_index, &mc);
1027
963
goto end;
1028
964
}
1029
965
1030
if(not debug){
966
if (not debug){
1031
967
avahi_set_log_function(empty_log);
1032
968
}
1033
969
1036
972
1037
973
/* Allocate main Avahi loop object */
1038
974
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
975
if (mc.simple_poll == NULL) {
1040
976
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
977
" object.\n");
1042
978
exitcode = EXIT_FAILURE;
1043
979
goto end;
1044
980
}
1045
981
1046
982
{
1047
983
AvahiServerConfig config;
1048
984
/* Do not publish any local Zeroconf records */
1051
987
config.publish_addresses = 0;
1052
988
config.publish_workstation = 0;
1053
989
config.publish_domain = 0;
1054
990
1055
991
/* Allocate a new server */
1056
992
mc.server = avahi_server_new(avahi_simple_poll_get
1057
993
(mc.simple_poll), &config, NULL,
1058
994
NULL, &error);
1059
995
1060
996
/* Free the Avahi configuration data */
1061
997
avahi_server_config_free(&config);
1062
998
}
1063
999
1064
1000
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1001
if (mc.server == NULL) {
1066
1002
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
1003
avahi_strerror(error));
1068
1004
exitcode = EXIT_FAILURE;
1074
1010
AVAHI_PROTO_INET6,
1075
1011
"_mandos._tcp", NULL, 0,
1076
1012
browse_callback, &mc);
1077
if(sb == NULL) {
1013
if (sb == NULL) {
1078
1014
fprintf(stderr, "Failed to create service browser: %s\n",
1079
1015
avahi_strerror(avahi_server_errno(mc.server)));
1080
1016
exitcode = EXIT_FAILURE;
1082
1018
}
1083
1019
1084
1020
/* Run the main loop */
1085
1086
if(debug){
1021
1022
if (debug){
1087
1023
fprintf(stderr, "Starting Avahi loop search\n");
1088
1024
}
1089
1025
1090
1026
avahi_simple_poll_loop(mc.simple_poll);
1091
1027
1092
1028
end:
1093
1094
if(debug){
1029
1030
if (debug){
1095
1031
fprintf(stderr, "%s exiting\n", argv[0]);
1096
1032
}
1097
1033
1098
1034
/* Cleanup things */
1099
if(sb != NULL)
1035
if (sb != NULL)
1100
1036
avahi_s_service_browser_free(sb);
1101
1037
1102
if(mc.server != NULL)
1038
if (mc.server != NULL)
1103
1039
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1040
1041
if (mc.simple_poll != NULL)
1106
1042
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initialized){
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1045
1046
if (gnutls_initalized){
1109
1047
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initialized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1132
}
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1146
free(fullname);
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1048
gnutls_global_deinit ();
1049
}
1050
1157
1051
return exitcode;
1158
1052
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0