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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
#include <time.h> /* time(), nanosleep() */
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,
76
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
77
#include <sys/klog.h> /* klogctl() */
78
71
79
72
/* Avahi */
80
73
/* All Avahi types, constants and functions
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){
283
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
285
if(result == NULL){
286
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
287
} else {
288
fprintf(stderr, "Unsupported algorithm: %s\n",
289
result->unsupported_algorithm);
290
fprintf(stderr, "Wrong key usage: %u\n",
291
result->wrong_key_usage);
292
if(result->file_name != NULL){
293
fprintf(stderr, "File name: %s\n", result->file_name);
294
}
295
gpgme_recipient_t recipient;
296
recipient = result->recipients;
297
if(recipient){
298
while(recipient != NULL){
299
fprintf(stderr, "Public key algorithm: %s\n",
300
gpgme_pubkey_algo_name(recipient->pubkey_algo));
301
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
302
fprintf(stderr, "Secret key available: %s\n",
303
recipient->status == GPG_ERR_NO_SECKEY
304
? "No" : "Yes");
305
recipient = recipient->next;
306
}
307
}
308
}
309
}
310
217
goto decrypt_end;
311
218
}
312
219
314
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
315
222
}
316
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
317
253
/* 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");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
320
256
plaintext_length = -1;
321
257
goto decrypt_end;
322
258
}
326
262
plaintext_capacity = adjustbuffer(plaintext,
327
263
(size_t)plaintext_length,
328
264
plaintext_capacity);
329
if(plaintext_capacity == 0){
265
if (plaintext_capacity == 0){
330
266
perror("adjustbuffer");
331
267
plaintext_length = -1;
332
268
goto decrypt_end;
335
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
336
272
BUFFER_SIZE);
337
273
/* Print the data, if any */
338
if(ret == 0){
274
if (ret == 0){
339
275
/* EOF */
340
276
break;
341
277
}
346
282
}
347
283
plaintext_length += ret;
348
284
}
349
285
350
286
if(debug){
351
287
fprintf(stderr, "Decrypted password is: ");
352
288
for(ssize_t i = 0; i < plaintext_length; i++){
365
301
return plaintext_length;
366
302
}
367
303
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)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
372
307
ret = "(unknown)";
373
308
return ret;
374
309
}
389
324
}
390
325
391
326
ret = gnutls_global_init();
392
if(ret != GNUTLS_E_SUCCESS) {
393
fprintf(stderr, "GnuTLS global_init: %s\n",
394
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
395
330
return -1;
396
331
}
397
332
398
if(debug){
333
if (debug){
399
334
/* "Use a log level over 10 to enable all debugging options."
400
335
* - GnuTLS manual
401
336
*/
405
340
406
341
/* OpenPGP credentials */
407
342
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();
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 ();
415
348
return -1;
416
349
}
417
350
418
351
if(debug){
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" 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,
421
354
seckeyfilename);
422
355
}
423
356
424
357
ret = gnutls_certificate_set_openpgp_key_file
425
358
(mc->cred, pubkeyfilename, seckeyfilename,
426
359
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
360
if (ret != GNUTLS_E_SUCCESS) {
428
361
fprintf(stderr,
429
362
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
363
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
fprintf(stderr, "The GnuTLS error is: %s\n",
364
fprintf(stdout, "The GnuTLS error is: %s\n",
432
365
safer_gnutls_strerror(ret));
433
366
goto globalfail;
434
367
}
435
368
436
369
/* GnuTLS server initialization */
437
370
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));
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
441
374
goto globalfail;
442
375
}
443
376
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));
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
447
380
goto globalfail;
448
381
}
449
382
450
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
451
384
452
385
return 0;
453
386
454
387
globalfail:
455
388
456
389
gnutls_certificate_free_credentials(mc->cred);
457
390
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
459
391
return -1;
392
460
393
}
461
394
462
395
static int init_gnutls_session(mandos_context *mc,
464
397
int ret;
465
398
/* GnuTLS session creation */
466
399
ret = gnutls_init(session, GNUTLS_SERVER);
467
if(ret != GNUTLS_E_SUCCESS){
400
if (ret != GNUTLS_E_SUCCESS){
468
401
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
469
402
safer_gnutls_strerror(ret));
470
403
}
472
405
{
473
406
const char *err;
474
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
408
if (ret != GNUTLS_E_SUCCESS) {
476
409
fprintf(stderr, "Syntax error at: %s\n", err);
477
410
fprintf(stderr, "GnuTLS error: %s\n",
478
411
safer_gnutls_strerror(ret));
479
gnutls_deinit(*session);
412
gnutls_deinit (*session);
480
413
return -1;
481
414
}
482
415
}
483
416
484
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
418
mc->cred);
486
if(ret != GNUTLS_E_SUCCESS) {
419
if (ret != GNUTLS_E_SUCCESS) {
487
420
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
488
421
safer_gnutls_strerror(ret));
489
gnutls_deinit(*session);
422
gnutls_deinit (*session);
490
423
return -1;
491
424
}
492
425
493
426
/* ignore client certificate if any. */
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
496
429
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
498
431
499
432
return 0;
500
433
}
508
441
AvahiIfIndex if_index,
509
442
mandos_context *mc){
510
443
int ret, tcp_sd;
511
ssize_t sret;
512
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
513
445
char *buffer = NULL;
514
446
char *decrypted_buffer;
520
452
char interface[IF_NAMESIZE];
521
453
gnutls_session_t session;
522
454
523
ret = init_gnutls_session(mc, &session);
524
if(ret != 0){
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
525
457
return -1;
526
458
}
527
459
535
467
perror("socket");
536
468
return -1;
537
469
}
538
470
539
471
if(debug){
540
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
541
473
perror("if_indextoname");
549
481
/* It would be nice to have a way to detect if we were passed an
550
482
IPv4 address here. Now we assume an IPv6 address. */
551
483
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
552
if(ret < 0 ){
484
if (ret < 0 ){
553
485
perror("inet_pton");
554
486
return -1;
555
487
}
557
489
fprintf(stderr, "Bad address: %s\n", ip);
558
490
return -1;
559
491
}
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
561
-Wconversion and
562
-Wunreachable-code */
492
to.in6.sin6_port = htons(port); /* Spurious warning */
563
493
564
494
to.in6.sin6_scope_id = (uint32_t)if_index;
565
495
578
508
}
579
509
580
510
ret = connect(tcp_sd, &to.in, sizeof(to));
581
if(ret < 0){
511
if (ret < 0){
582
512
perror("connect");
583
513
return -1;
584
514
}
585
515
586
516
const char *out = mandos_protocol_version;
587
517
written = 0;
588
while(true){
518
while (true){
589
519
size_t out_size = strlen(out);
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
591
521
out_size - written));
592
if(ret == -1){
522
if (ret == -1){
593
523
perror("write");
594
524
retval = -1;
595
525
goto mandos_end;
598
528
if(written < out_size){
599
529
continue;
600
530
} else {
601
if(out == mandos_protocol_version){
531
if (out == mandos_protocol_version){
602
532
written = 0;
603
533
out = "\r\n";
604
534
} else {
606
536
}
607
537
}
608
538
}
609
539
610
540
if(debug){
611
541
fprintf(stderr, "Establishing TLS session with %s\n", ip);
612
542
}
613
543
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
616
546
do{
617
ret = gnutls_handshake(session);
547
ret = gnutls_handshake (session);
618
548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
619
549
620
if(ret != GNUTLS_E_SUCCESS){
550
if (ret != GNUTLS_E_SUCCESS){
621
551
if(debug){
622
552
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
623
gnutls_perror(ret);
553
gnutls_perror (ret);
624
554
}
625
555
retval = -1;
626
556
goto mandos_end;
632
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
633
563
ip);
634
564
}
635
565
636
566
while(true){
637
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
638
568
buffer_capacity);
639
if(buffer_capacity == 0){
569
if (buffer_capacity == 0){
640
570
perror("adjustbuffer");
641
571
retval = -1;
642
572
goto mandos_end;
643
573
}
644
574
645
sret = gnutls_record_recv(session, buffer+buffer_length,
646
BUFFER_SIZE);
647
if(sret == 0){
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
577
if (ret == 0){
648
578
break;
649
579
}
650
if(sret < 0){
651
switch(sret){
580
if (ret < 0){
581
switch(ret){
652
582
case GNUTLS_E_INTERRUPTED:
653
583
case GNUTLS_E_AGAIN:
654
584
break;
655
585
case GNUTLS_E_REHANDSHAKE:
656
586
do{
657
ret = gnutls_handshake(session);
587
ret = gnutls_handshake (session);
658
588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
659
if(ret < 0){
589
if (ret < 0){
660
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
661
gnutls_perror(ret);
591
gnutls_perror (ret);
662
592
retval = -1;
663
593
goto mandos_end;
664
594
}
667
597
fprintf(stderr, "Unknown error while reading data from"
668
598
" encrypted session with Mandos server\n");
669
599
retval = -1;
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
671
601
goto mandos_end;
672
602
}
673
603
} else {
674
buffer_length += (size_t) sret;
604
buffer_length += (size_t) ret;
675
605
}
676
606
}
677
607
679
609
fprintf(stderr, "Closing TLS session\n");
680
610
}
681
611
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
683
613
684
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
614
if (buffer_length > 0){
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
686
616
buffer_length,
687
&decrypted_buffer);
688
if(decrypted_buffer_size >= 0){
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
689
620
written = 0;
690
621
while(written < (size_t) decrypted_buffer_size){
691
ret = (int)fwrite(decrypted_buffer + written, 1,
692
(size_t)decrypted_buffer_size - written,
693
stdout);
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
694
625
if(ret == 0 and ferror(stdout)){
695
626
if(debug){
696
627
fprintf(stderr, "Error writing encrypted data: %s\n",
705
636
} else {
706
637
retval = -1;
707
638
}
708
} else {
709
retval = -1;
710
639
}
711
640
712
641
/* Shutdown procedure */
713
642
714
643
mandos_end:
715
644
free(buffer);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
719
}
720
gnutls_deinit(session);
645
close(tcp_sd);
646
gnutls_deinit (session);
721
647
return retval;
722
648
}
723
649
741
667
/* Called whenever a service has been resolved successfully or
742
668
timed out */
743
669
744
switch(event) {
670
switch (event) {
745
671
default:
746
672
case AVAHI_RESOLVER_FAILURE:
747
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
755
681
avahi_address_snprint(ip, sizeof(ip), address);
756
682
if(debug){
757
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
ip, (intmax_t)interface, port);
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
760
686
}
761
687
int ret = start_mandos_communication(ip, port, interface, mc);
762
if(ret == 0){
688
if (ret == 0){
763
689
avahi_simple_poll_quit(mc->simple_poll);
764
690
}
765
691
}
783
709
/* Called whenever a new services becomes available on the LAN or
784
710
is removed from the LAN */
785
711
786
switch(event) {
712
switch (event) {
787
713
default:
788
714
case AVAHI_BROWSER_FAILURE:
789
715
798
724
the callback function is called the Avahi server will free the
799
725
resolver for us. */
800
726
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
802
728
protocol, name, type, domain,
803
729
AVAHI_PROTO_INET6, 0,
804
730
resolve_callback, mc)))
818
744
}
819
745
}
820
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
821
759
int main(int argc, char *argv[]){
822
760
AvahiSServiceBrowser *sb = NULL;
823
761
int error;
824
762
int ret;
825
intmax_t tmpmax;
826
int numchars;
827
763
int exitcode = EXIT_SUCCESS;
828
764
const char *interface = "eth0";
829
765
struct ifreq network;
831
767
uid_t uid;
832
768
gid_t gid;
833
769
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
838
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
839
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
840
.dh_bits = 1024, .priority = "SECURE256"
841
":!CTYPE-X.509:+CTYPE-OPENPGP" };
776
.dh_bits = 1024, .priority = "SECURE256"};
842
777
bool gnutls_initalized = false;
843
bool gpgme_initalized = false;
844
double delay = 2.5;
845
778
846
779
{
847
780
struct argp_option options[] = {
848
781
{ .name = "debug", .key = 128,
849
782
.doc = "Debug mode", .group = 3 },
850
783
{ .name = "connect", .key = 'c',
851
.arg = "ADDRESS:PORT",
852
.doc = "Connect directly to a specific Mandos server",
784
.arg = "IP",
785
.doc = "Connect directly to a sepcified mandos server",
853
786
.group = 1 },
854
787
{ .name = "interface", .key = 'i',
855
.arg = "NAME",
856
.doc = "Interface that will be used to search for Mandos"
857
" 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",
858
794
.group = 1 },
859
795
{ .name = "seckey", .key = 's',
860
.arg = "FILE",
861
.doc = "OpenPGP secret key file base name",
796
.arg = "SECKEY",
797
.doc = "Secret openpgp key for gnutls authentication",
862
798
.group = 1 },
863
799
{ .name = "pubkey", .key = 'p',
864
.arg = "FILE",
865
.doc = "OpenPGP public key file base name",
800
.arg = "PUBKEY",
801
.doc = "Public openpgp key for gnutls authentication",
866
802
.group = 2 },
867
803
{ .name = "dh-bits", .key = 129,
868
804
.arg = "BITS",
869
.doc = "Bit length of the prime number used in the"
870
" Diffie-Hellman key exchange",
805
.doc = "dh-bits to use in gnutls communication",
871
806
.group = 2 },
872
807
{ .name = "priority", .key = 130,
873
.arg = "STRING",
874
.doc = "GnuTLS priority string for the TLS handshake",
875
.group = 1 },
876
{ .name = "delay", .key = 131,
877
.arg = "SECONDS",
878
.doc = "Maximum delay to wait for interface startup",
879
.group = 2 },
808
.arg = "PRIORITY",
809
.doc = "GNUTLS priority", .group = 1 },
880
810
{ .name = NULL }
881
811
};
812
882
813
883
error_t parse_opt(int key, char *arg,
884
struct argp_state *state) {
885
switch(key) {
886
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:
887
820
debug = true;
888
821
break;
889
case 'c': /* --connect */
822
case 'c':
890
823
connect_to = arg;
891
824
break;
892
case 'i': /* --interface */
825
case 'i':
893
826
interface = arg;
894
827
break;
895
case 's': /* --seckey */
896
seckey = arg;
897
break;
898
case 'p': /* --pubkey */
899
pubkey = arg;
900
break;
901
case 129: /* --dh-bits */
902
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
903
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
904
or arg[numchars] != '\0'){
905
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");
906
842
exit(EXIT_FAILURE);
907
843
}
908
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
909
844
break;
910
case 130: /* --priority */
845
case 130:
911
846
mc.priority = arg;
912
847
break;
913
case 131: /* --delay */
914
ret = sscanf(arg, "%lf%n", &delay, &numchars);
915
if(ret < 1 or arg[numchars] != '\0'){
916
fprintf(stderr, "Bad delay\n");
917
exit(EXIT_FAILURE);
918
}
919
break;
920
848
case ARGP_KEY_ARG:
921
argp_usage(state);
849
argp_usage (state);
922
850
case ARGP_KEY_END:
923
851
break;
924
852
default:
926
854
}
927
855
return 0;
928
856
}
929
857
930
858
struct argp argp = { .options = options, .parser = parse_opt,
931
859
.args_doc = "",
932
860
.doc = "Mandos client -- Get and decrypt"
933
" passwords from a Mandos server" };
934
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
935
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){
936
864
fprintf(stderr, "Unknown error while parsing arguments\n");
937
865
exitcode = EXIT_FAILURE;
938
866
goto end;
939
867
}
940
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
}
941
892
942
893
/* If the interface is down, bring it up */
943
894
{
944
// Lower kernel loglevel to KERN_NOTICE to avoid
945
// KERN_INFO messages to mess up the prompt
946
ret = klogctl(8, NULL, 5);
947
if(ret == -1){
948
perror("klogctl");
949
}
950
951
895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
952
896
if(sd < 0) {
953
897
perror("socket");
954
898
exitcode = EXIT_FAILURE;
955
ret = klogctl(7, NULL, 0);
956
if(ret == -1){
957
perror("klogctl");
958
}
959
899
goto end;
960
900
}
961
901
strcpy(network.ifr_name, interface);
962
902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
963
903
if(ret == -1){
964
904
perror("ioctl SIOCGIFFLAGS");
965
ret = klogctl(7, NULL, 0);
966
if(ret == -1){
967
perror("klogctl");
968
}
969
905
exitcode = EXIT_FAILURE;
970
906
goto end;
971
907
}
975
911
if(ret == -1){
976
912
perror("ioctl SIOCSIFFLAGS");
977
913
exitcode = EXIT_FAILURE;
978
ret = klogctl(7, NULL, 0);
979
if(ret == -1){
980
perror("klogctl");
981
}
982
914
goto end;
983
915
}
984
916
}
985
// sleep checking until interface is running
986
for(int i=0; i < delay * 4; i++){
987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
988
if(ret == -1){
989
perror("ioctl SIOCGIFFLAGS");
990
} else if(network.ifr_flags & IFF_RUNNING){
991
break;
992
}
993
struct timespec sleeptime = { .tv_nsec = 250000000 };
994
nanosleep(&sleeptime, NULL);
995
}
996
ret = (int)TEMP_FAILURE_RETRY(close(sd));
997
if(ret == -1){
998
perror("close");
999
}
1000
// Restores kernel loglevel to default
1001
ret = klogctl(7, NULL, 0);
1002
if(ret == -1){
1003
perror("klogctl");
1004
}
917
close(sd);
1005
918
}
1006
919
1007
920
uid = getuid();
1008
921
gid = getgid();
1009
922
1010
923
ret = setuid(uid);
1011
if(ret == -1){
924
if (ret == -1){
1012
925
perror("setuid");
1013
926
}
1014
927
1015
928
setgid(gid);
1016
if(ret == -1){
929
if (ret == -1){
1017
930
perror("setgid");
1018
931
}
1019
932
1020
ret = init_gnutls_global(&mc, pubkey, seckey);
1021
if(ret == -1){
1022
fprintf(stderr, "init_gnutls_global failed\n");
1023
exitcode = EXIT_FAILURE;
1024
goto end;
1025
} else {
1026
gnutls_initalized = true;
1027
}
1028
1029
if(mkdtemp(tempdir) == NULL){
1030
perror("mkdtemp");
1031
tempdir[0] = '\0';
1032
goto end;
1033
}
1034
1035
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1036
fprintf(stderr, "gpgme_initalized failed\n");
1037
exitcode = EXIT_FAILURE;
1038
goto end;
1039
} else {
1040
gpgme_initalized = true;
1041
}
1042
1043
933
if_index = (AvahiIfIndex) if_nametoindex(interface);
1044
934
if(if_index == 0){
1045
935
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1055
945
exitcode = EXIT_FAILURE;
1056
946
goto end;
1057
947
}
1058
uint16_t port;
1059
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1060
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1061
or address[numchars+1] != '\0'){
1062
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");
1063
952
exitcode = EXIT_FAILURE;
1064
953
goto end;
1065
954
}
1066
port = (uint16_t)tmpmax;
1067
955
*address = '\0';
1068
956
address = connect_to;
1069
957
ret = start_mandos_communication(address, port, if_index, &mc);
1075
963
goto end;
1076
964
}
1077
965
1078
if(not debug){
966
if (not debug){
1079
967
avahi_set_log_function(empty_log);
1080
968
}
1081
969
1084
972
1085
973
/* Allocate main Avahi loop object */
1086
974
mc.simple_poll = avahi_simple_poll_new();
1087
if(mc.simple_poll == NULL) {
975
if (mc.simple_poll == NULL) {
1088
976
fprintf(stderr, "Avahi: Failed to create simple poll"
1089
977
" object.\n");
1090
978
exitcode = EXIT_FAILURE;
1091
979
goto end;
1092
980
}
1093
981
1094
982
{
1095
983
AvahiServerConfig config;
1096
984
/* Do not publish any local Zeroconf records */
1099
987
config.publish_addresses = 0;
1100
988
config.publish_workstation = 0;
1101
989
config.publish_domain = 0;
1102
990
1103
991
/* Allocate a new server */
1104
992
mc.server = avahi_server_new(avahi_simple_poll_get
1105
993
(mc.simple_poll), &config, NULL,
1106
994
NULL, &error);
1107
995
1108
996
/* Free the Avahi configuration data */
1109
997
avahi_server_config_free(&config);
1110
998
}
1111
999
1112
1000
/* Check if creating the Avahi server object succeeded */
1113
if(mc.server == NULL) {
1001
if (mc.server == NULL) {
1114
1002
fprintf(stderr, "Failed to create Avahi server: %s\n",
1115
1003
avahi_strerror(error));
1116
1004
exitcode = EXIT_FAILURE;
1122
1010
AVAHI_PROTO_INET6,
1123
1011
"_mandos._tcp", NULL, 0,
1124
1012
browse_callback, &mc);
1125
if(sb == NULL) {
1013
if (sb == NULL) {
1126
1014
fprintf(stderr, "Failed to create service browser: %s\n",
1127
1015
avahi_strerror(avahi_server_errno(mc.server)));
1128
1016
exitcode = EXIT_FAILURE;
1130
1018
}
1131
1019
1132
1020
/* Run the main loop */
1133
1134
if(debug){
1021
1022
if (debug){
1135
1023
fprintf(stderr, "Starting Avahi loop search\n");
1136
1024
}
1137
1025
1138
1026
avahi_simple_poll_loop(mc.simple_poll);
1139
1027
1140
1028
end:
1141
1142
if(debug){
1029
1030
if (debug){
1143
1031
fprintf(stderr, "%s exiting\n", argv[0]);
1144
1032
}
1145
1033
1146
1034
/* Cleanup things */
1147
if(sb != NULL)
1035
if (sb != NULL)
1148
1036
avahi_s_service_browser_free(sb);
1149
1037
1150
if(mc.server != NULL)
1038
if (mc.server != NULL)
1151
1039
avahi_server_free(mc.server);
1152
1153
if(mc.simple_poll != NULL)
1040
1041
if (mc.simple_poll != NULL)
1154
1042
avahi_simple_poll_free(mc.simple_poll);
1155
1156
if(gnutls_initalized){
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1045
1046
if (gnutls_initalized){
1157
1047
gnutls_certificate_free_credentials(mc.cred);
1158
gnutls_global_deinit();
1159
gnutls_dh_params_deinit(mc.dh_params);
1160
}
1161
1162
if(gpgme_initalized){
1163
gpgme_release(mc.ctx);
1164
}
1165
1166
/* Removes the temp directory used by GPGME */
1167
if(tempdir[0] != '\0'){
1168
DIR *d;
1169
struct dirent *direntry;
1170
d = opendir(tempdir);
1171
if(d == NULL){
1172
if(errno != ENOENT){
1173
perror("opendir");
1174
}
1175
} else {
1176
while(true){
1177
direntry = readdir(d);
1178
if(direntry == NULL){
1179
break;
1180
}
1181
if(direntry->d_type == DT_REG){
1182
char *fullname = NULL;
1183
ret = asprintf(&fullname, "%s/%s", tempdir,
1184
direntry->d_name);
1185
if(ret < 0){
1186
perror("asprintf");
1187
continue;
1188
}
1189
ret = unlink(fullname);
1190
if(ret == -1){
1191
fprintf(stderr, "unlink(\"%s\"): %s",
1192
fullname, strerror(errno));
1193
}
1194
free(fullname);
1195
}
1196
}
1197
closedir(d);
1198
}
1199
ret = rmdir(tempdir);
1200
if(ret == -1 and errno != ENOENT){
1201
perror("rmdir");
1202
}
1203
}
1204
1048
gnutls_global_deinit ();
1049
}
1050
1205
1051
return exitcode;
1206
1052
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0