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- Committer: Teddy Hogeborn
- Date: 2008-08-12 19:22:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20080812192234-8bm17713ltih9ud1
* initramfs-tools-hook: New.
* initramfs-tools-hook-conf: New.
* initramfs-tools-hook-conf: New.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- 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
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
36
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
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,
44
42
srand() */
45
43
#include <stdbool.h> /* bool, true */
46
44
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
45
strerror(), memcpy(), strcpy() */
48
46
#include <sys/ioctl.h> /* ioctl */
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,
88
81
#include <avahi-common/error.h>
89
82
90
83
/* GnuTLS */
91
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
92
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
93
85
gnutls_*
94
86
init_gnutls_session(),
95
87
GNUTLS_* */
96
#include <gnutls/openpgp.h>
97
/* gnutls_certificate_set_openpgp_key_file(),
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
98
89
GNUTLS_OPENPGP_FMT_BASE64 */
99
90
100
91
/* GPGME */
101
#include <gpgme.h> /* All GPGME types, constants and
102
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
103
93
gpgme_*
104
94
GPGME_PROTOCOL_OpenPGP,
105
95
GPG_ERR_NO_* */
106
96
107
97
#define BUFFER_SIZE 256
108
98
109
#define PATHDIR "/conf/conf.d/mandos"
110
#define SECKEY "seckey.txt"
111
#define PUBKEY "pubkey.txt"
112
113
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
114
101
static const char mandos_protocol_version[] = "1";
115
const char *argp_program_version = "mandos-client " VERSION;
102
const char *argp_program_version = "password-request 1.0";
116
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
117
104
118
105
/* Used for passing in values through the Avahi callback functions */
123
110
unsigned int dh_bits;
124
111
gnutls_dh_params_t dh_params;
125
112
const char *priority;
126
gpgme_ctx_t ctx;
127
113
} mandos_context;
128
114
129
115
/*
133
119
*/
134
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
135
121
size_t buffer_capacity){
136
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
137
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
138
if(buffer == NULL){
124
if (buffer == NULL){
139
125
return 0;
140
126
}
141
127
buffer_capacity += BUFFER_SIZE;
144
130
}
145
131
146
132
/*
147
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
148
135
*/
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
150
const char *pubkey, const char *tempdir){
151
int ret;
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
152
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
153
146
gpgme_engine_info_t engine_info;
154
147
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");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
193
150
}
194
151
195
152
/* Init GPGME */
196
153
gpgme_check_version(NULL);
197
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
198
if(rc != GPG_ERR_NO_ERROR){
155
if (rc != GPG_ERR_NO_ERROR){
199
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
200
157
gpgme_strsource(rc), gpgme_strerror(rc));
201
return false;
158
return -1;
202
159
}
203
160
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){
161
/* Set GPGME home directory for the OpenPGP engine only */
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
207
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
208
165
gpgme_strsource(rc), gpgme_strerror(rc));
209
return false;
166
return -1;
210
167
}
211
168
while(engine_info != NULL){
212
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
213
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
214
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
215
172
break;
216
173
}
217
174
engine_info = engine_info->next;
218
175
}
219
176
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");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
255
179
}
256
180
257
181
/* Create new GPGME data buffer from memory cryptotext */
258
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
259
183
0);
260
if(rc != GPG_ERR_NO_ERROR){
184
if (rc != GPG_ERR_NO_ERROR){
261
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
262
186
gpgme_strsource(rc), gpgme_strerror(rc));
263
187
return -1;
265
189
266
190
/* Create new empty GPGME data buffer for the plaintext */
267
191
rc = gpgme_data_new(&dh_plain);
268
if(rc != GPG_ERR_NO_ERROR){
192
if (rc != GPG_ERR_NO_ERROR){
269
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
270
194
gpgme_strsource(rc), gpgme_strerror(rc));
271
195
gpgme_data_release(dh_crypto);
272
196
return -1;
273
197
}
274
198
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
275
208
/* Decrypt data from the cryptotext data buffer to the plaintext
276
209
data buffer */
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
278
if(rc != GPG_ERR_NO_ERROR){
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
279
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
280
213
gpgme_strsource(rc), gpgme_strerror(rc));
281
214
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
215
goto decrypt_end;
311
216
}
312
217
314
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
315
220
}
316
221
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
if(recipient){
238
while(recipient != NULL){
239
fprintf(stderr, "Public key algorithm: %s\n",
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
241
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
242
fprintf(stderr, "Secret key available: %s\n",
243
recipient->status == GPG_ERR_NO_SECKEY
244
? "No" : "Yes");
245
recipient = recipient->next;
246
}
247
}
248
}
249
}
250
317
251
/* 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");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
320
254
plaintext_length = -1;
321
255
goto decrypt_end;
322
256
}
326
260
plaintext_capacity = adjustbuffer(plaintext,
327
261
(size_t)plaintext_length,
328
262
plaintext_capacity);
329
if(plaintext_capacity == 0){
263
if (plaintext_capacity == 0){
330
264
perror("adjustbuffer");
331
265
plaintext_length = -1;
332
266
goto decrypt_end;
335
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
336
270
BUFFER_SIZE);
337
271
/* Print the data, if any */
338
if(ret == 0){
272
if (ret == 0){
339
273
/* EOF */
340
274
break;
341
275
}
346
280
}
347
281
plaintext_length += ret;
348
282
}
349
283
350
284
if(debug){
351
285
fprintf(stderr, "Decrypted password is: ");
352
286
for(ssize_t i = 0; i < plaintext_length; i++){
365
299
return plaintext_length;
366
300
}
367
301
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)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
372
305
ret = "(unknown)";
373
306
return ret;
374
307
}
380
313
}
381
314
382
315
static int init_gnutls_global(mandos_context *mc,
383
const char *pubkeyfilename,
384
const char *seckeyfilename){
316
const char *pubkeyfile,
317
const char *seckeyfile){
385
318
int ret;
386
319
387
320
if(debug){
389
322
}
390
323
391
324
ret = gnutls_global_init();
392
if(ret != GNUTLS_E_SUCCESS) {
393
fprintf(stderr, "GnuTLS global_init: %s\n",
394
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
395
328
return -1;
396
329
}
397
330
398
if(debug){
331
if (debug){
399
332
/* "Use a log level over 10 to enable all debugging options."
400
333
* - GnuTLS manual
401
334
*/
405
338
406
339
/* OpenPGP credentials */
407
340
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();
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
415
345
return -1;
416
346
}
417
347
418
348
if(debug){
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
421
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
422
352
}
423
353
424
354
ret = gnutls_certificate_set_openpgp_key_file
425
(mc->cred, pubkeyfilename, seckeyfilename,
426
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
428
357
fprintf(stderr,
429
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
fprintf(stderr, "The GnuTLS error is: %s\n",
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
432
361
safer_gnutls_strerror(ret));
433
362
goto globalfail;
434
363
}
435
364
436
365
/* GnuTLS server initialization */
437
366
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));
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
441
370
goto globalfail;
442
371
}
443
372
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));
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
447
376
goto globalfail;
448
377
}
449
378
450
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
451
380
452
381
return 0;
453
382
454
383
globalfail:
455
384
456
385
gnutls_certificate_free_credentials(mc->cred);
457
386
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
459
387
return -1;
388
460
389
}
461
390
462
391
static int init_gnutls_session(mandos_context *mc,
464
393
int ret;
465
394
/* GnuTLS session creation */
466
395
ret = gnutls_init(session, GNUTLS_SERVER);
467
if(ret != GNUTLS_E_SUCCESS){
396
if (ret != GNUTLS_E_SUCCESS){
468
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
469
398
safer_gnutls_strerror(ret));
470
399
}
472
401
{
473
402
const char *err;
474
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
404
if (ret != GNUTLS_E_SUCCESS) {
476
405
fprintf(stderr, "Syntax error at: %s\n", err);
477
406
fprintf(stderr, "GnuTLS error: %s\n",
478
407
safer_gnutls_strerror(ret));
479
gnutls_deinit(*session);
408
gnutls_deinit (*session);
480
409
return -1;
481
410
}
482
411
}
483
412
484
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
414
mc->cred);
486
if(ret != GNUTLS_E_SUCCESS) {
415
if (ret != GNUTLS_E_SUCCESS) {
487
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
488
417
safer_gnutls_strerror(ret));
489
gnutls_deinit(*session);
418
gnutls_deinit (*session);
490
419
return -1;
491
420
}
492
421
493
422
/* ignore client certificate if any. */
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
496
425
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
498
427
499
428
return 0;
500
429
}
508
437
AvahiIfIndex if_index,
509
438
mandos_context *mc){
510
439
int ret, tcp_sd;
511
ssize_t sret;
512
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
513
441
char *buffer = NULL;
514
442
char *decrypted_buffer;
520
448
char interface[IF_NAMESIZE];
521
449
gnutls_session_t session;
522
450
523
ret = init_gnutls_session(mc, &session);
524
if(ret != 0){
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
525
453
return -1;
526
454
}
527
455
535
463
perror("socket");
536
464
return -1;
537
465
}
538
466
539
467
if(debug){
540
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
541
469
perror("if_indextoname");
544
472
fprintf(stderr, "Binding to interface %s\n", interface);
545
473
}
546
474
547
memset(&to, 0, sizeof(to));
475
memset(&to,0,sizeof(to)); /* Spurious warning */
548
476
to.in6.sin6_family = AF_INET6;
549
477
/* It would be nice to have a way to detect if we were passed an
550
478
IPv4 address here. Now we assume an IPv6 address. */
551
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
552
if(ret < 0 ){
480
if (ret < 0 ){
553
481
perror("inet_pton");
554
482
return -1;
555
483
}
557
485
fprintf(stderr, "Bad address: %s\n", ip);
558
486
return -1;
559
487
}
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
561
-Wconversion and
562
-Wunreachable-code */
488
to.in6.sin6_port = htons(port); /* Spurious warning */
563
489
564
490
to.in6.sin6_scope_id = (uint32_t)if_index;
565
491
578
504
}
579
505
580
506
ret = connect(tcp_sd, &to.in, sizeof(to));
581
if(ret < 0){
507
if (ret < 0){
582
508
perror("connect");
583
509
return -1;
584
510
}
585
511
586
512
const char *out = mandos_protocol_version;
587
513
written = 0;
588
while(true){
514
while (true){
589
515
size_t out_size = strlen(out);
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
591
517
out_size - written));
592
if(ret == -1){
518
if (ret == -1){
593
519
perror("write");
594
520
retval = -1;
595
521
goto mandos_end;
598
524
if(written < out_size){
599
525
continue;
600
526
} else {
601
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
602
528
written = 0;
603
529
out = "\r\n";
604
530
} else {
606
532
}
607
533
}
608
534
}
609
535
610
536
if(debug){
611
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
612
538
}
613
539
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
616
542
do{
617
ret = gnutls_handshake(session);
543
ret = gnutls_handshake (session);
618
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
619
545
620
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
621
547
if(debug){
622
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
623
gnutls_perror(ret);
549
gnutls_perror (ret);
624
550
}
625
551
retval = -1;
626
552
goto mandos_end;
632
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
633
559
ip);
634
560
}
635
561
636
562
while(true){
637
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
638
564
buffer_capacity);
639
if(buffer_capacity == 0){
565
if (buffer_capacity == 0){
640
566
perror("adjustbuffer");
641
567
retval = -1;
642
568
goto mandos_end;
643
569
}
644
570
645
sret = gnutls_record_recv(session, buffer+buffer_length,
646
BUFFER_SIZE);
647
if(sret == 0){
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
648
574
break;
649
575
}
650
if(sret < 0){
651
switch(sret){
576
if (ret < 0){
577
switch(ret){
652
578
case GNUTLS_E_INTERRUPTED:
653
579
case GNUTLS_E_AGAIN:
654
580
break;
655
581
case GNUTLS_E_REHANDSHAKE:
656
582
do{
657
ret = gnutls_handshake(session);
583
ret = gnutls_handshake (session);
658
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
659
if(ret < 0){
585
if (ret < 0){
660
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
661
gnutls_perror(ret);
587
gnutls_perror (ret);
662
588
retval = -1;
663
589
goto mandos_end;
664
590
}
667
593
fprintf(stderr, "Unknown error while reading data from"
668
594
" encrypted session with Mandos server\n");
669
595
retval = -1;
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
671
597
goto mandos_end;
672
598
}
673
599
} else {
674
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
675
601
}
676
602
}
677
603
679
605
fprintf(stderr, "Closing TLS session\n");
680
606
}
681
607
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
683
609
684
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
686
612
buffer_length,
687
&decrypted_buffer);
688
if(decrypted_buffer_size >= 0){
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
689
616
written = 0;
690
617
while(written < (size_t) decrypted_buffer_size){
691
ret = (int)fwrite(decrypted_buffer + written, 1,
692
(size_t)decrypted_buffer_size - written,
693
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
694
621
if(ret == 0 and ferror(stdout)){
695
622
if(debug){
696
623
fprintf(stderr, "Error writing encrypted data: %s\n",
705
632
} else {
706
633
retval = -1;
707
634
}
708
} else {
709
retval = -1;
710
635
}
711
636
712
637
/* Shutdown procedure */
713
638
714
639
mandos_end:
715
640
free(buffer);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
719
}
720
gnutls_deinit(session);
641
close(tcp_sd);
642
gnutls_deinit (session);
721
643
return retval;
722
644
}
723
645
736
658
flags,
737
659
void* userdata) {
738
660
mandos_context *mc = userdata;
739
assert(r);
661
assert(r); /* Spurious warning */
740
662
741
663
/* Called whenever a service has been resolved successfully or
742
664
timed out */
743
665
744
switch(event) {
666
switch (event) {
745
667
default:
746
668
case AVAHI_RESOLVER_FAILURE:
747
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
755
677
avahi_address_snprint(ip, sizeof(ip), address);
756
678
if(debug){
757
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
ip, (intmax_t)interface, port);
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
760
682
}
761
683
int ret = start_mandos_communication(ip, port, interface, mc);
762
if(ret == 0){
763
avahi_simple_poll_quit(mc->simple_poll);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
764
686
}
765
687
}
766
688
}
778
700
flags,
779
701
void* userdata) {
780
702
mandos_context *mc = userdata;
781
assert(b);
703
assert(b); /* Spurious warning */
782
704
783
705
/* Called whenever a new services becomes available on the LAN or
784
706
is removed from the LAN */
785
707
786
switch(event) {
708
switch (event) {
787
709
default:
788
710
case AVAHI_BROWSER_FAILURE:
789
711
798
720
the callback function is called the Avahi server will free the
799
721
resolver for us. */
800
722
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
802
724
protocol, name, type, domain,
803
725
AVAHI_PROTO_INET6, 0,
804
726
resolve_callback, mc)))
818
740
}
819
741
}
820
742
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
return tmp;
761
}
762
763
821
764
int main(int argc, char *argv[]){
822
765
AvahiSServiceBrowser *sb = NULL;
823
766
int error;
824
767
int ret;
825
intmax_t tmpmax;
826
int numchars;
827
768
int exitcode = EXIT_SUCCESS;
828
769
const char *interface = "eth0";
829
770
struct ifreq network;
831
772
uid_t uid;
832
773
gid_t gid;
833
774
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
838
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
839
778
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;
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
844
781
845
782
{
846
783
struct argp_option options[] = {
847
784
{ .name = "debug", .key = 128,
848
785
.doc = "Debug mode", .group = 3 },
849
786
{ .name = "connect", .key = 'c',
850
.arg = "ADDRESS:PORT",
851
.doc = "Connect directly to a specific Mandos server",
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
852
789
.group = 1 },
853
790
{ .name = "interface", .key = 'i',
854
.arg = "NAME",
855
.doc = "Interface that will be used to search for Mandos"
856
" servers",
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
857
797
.group = 1 },
858
798
{ .name = "seckey", .key = 's',
859
.arg = "FILE",
860
.doc = "OpenPGP secret key file base name",
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
861
801
.group = 1 },
862
802
{ .name = "pubkey", .key = 'p',
863
.arg = "FILE",
864
.doc = "OpenPGP public key file base name",
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
865
805
.group = 2 },
866
806
{ .name = "dh-bits", .key = 129,
867
807
.arg = "BITS",
868
.doc = "Bit length of the prime number used in the"
869
" Diffie-Hellman key exchange",
808
.doc = "dh-bits to use in gnutls communication",
870
809
.group = 2 },
871
810
{ .name = "priority", .key = 130,
872
.arg = "STRING",
873
.doc = "GnuTLS priority string for the TLS handshake",
874
.group = 1 },
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
875
813
{ .name = NULL }
876
814
};
815
877
816
878
error_t parse_opt(int key, char *arg,
879
struct argp_state *state) {
880
switch(key) {
881
case 128: /* --debug */
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
882
823
debug = true;
883
824
break;
884
case 'c': /* --connect */
825
case 'c':
885
826
connect_to = arg;
886
827
break;
887
case 'i': /* --interface */
828
case 'i':
888
829
interface = arg;
889
830
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");
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
901
845
exit(EXIT_FAILURE);
902
846
}
903
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
904
847
break;
905
case 130: /* --priority */
848
case 130:
906
849
mc.priority = arg;
907
850
break;
908
851
case ARGP_KEY_ARG:
909
argp_usage(state);
910
case ARGP_KEY_END:
852
argp_usage (state);
911
853
break;
854
case ARGP_KEY_END:
855
break;
912
856
default:
913
857
return ARGP_ERR_UNKNOWN;
914
858
}
915
859
return 0;
916
860
}
917
861
918
862
struct argp argp = { .options = options, .parser = parse_opt,
919
863
.args_doc = "",
920
864
.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){
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
924
868
fprintf(stderr, "Unknown error while parsing arguments\n");
925
869
exitcode = EXIT_FAILURE;
926
870
goto end;
927
871
}
928
872
}
873
874
pubkeyfile = combinepath(keydir, pubkeyfile);
875
if (pubkeyfile == NULL){
876
perror("combinepath");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
881
seckeyfile = combinepath(keydir, seckeyfile);
882
if (seckeyfile == NULL){
883
perror("combinepath");
884
exitcode = EXIT_FAILURE;
885
goto end;
886
}
887
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
if (ret == -1){
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
929
896
930
897
/* If the interface is down, bring it up */
931
898
{
935
902
exitcode = EXIT_FAILURE;
936
903
goto end;
937
904
}
938
strcpy(network.ifr_name, interface);
905
strcpy(network.ifr_name, interface); /* Spurious warning */
939
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
940
907
if(ret == -1){
941
908
perror("ioctl SIOCGIFFLAGS");
951
918
goto end;
952
919
}
953
920
}
954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
955
if(ret == -1){
956
perror("close");
957
}
921
close(sd);
958
922
}
959
923
960
924
uid = getuid();
961
925
gid = getgid();
962
926
963
927
ret = setuid(uid);
964
if(ret == -1){
928
if (ret == -1){
965
929
perror("setuid");
966
930
}
967
931
968
932
setgid(gid);
969
if(ret == -1){
933
if (ret == -1){
970
934
perror("setgid");
971
935
}
972
936
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
937
if_index = (AvahiIfIndex) if_nametoindex(interface);
997
938
if(if_index == 0){
998
939
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1008
949
exitcode = EXIT_FAILURE;
1009
950
goto end;
1010
951
}
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");
952
errno = 0;
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
perror("Bad port number");
1016
956
exitcode = EXIT_FAILURE;
1017
957
goto end;
1018
958
}
1019
port = (uint16_t)tmpmax;
1020
959
*address = '\0';
1021
960
address = connect_to;
1022
961
ret = start_mandos_communication(address, port, if_index, &mc);
1028
967
goto end;
1029
968
}
1030
969
1031
if(not debug){
970
if (not debug){
1032
971
avahi_set_log_function(empty_log);
1033
972
}
1034
973
1037
976
1038
977
/* Allocate main Avahi loop object */
1039
978
mc.simple_poll = avahi_simple_poll_new();
1040
if(mc.simple_poll == NULL) {
979
if (mc.simple_poll == NULL) {
1041
980
fprintf(stderr, "Avahi: Failed to create simple poll"
1042
981
" object.\n");
1043
982
exitcode = EXIT_FAILURE;
1044
983
goto end;
1045
984
}
1046
985
1047
986
{
1048
987
AvahiServerConfig config;
1049
988
/* Do not publish any local Zeroconf records */
1052
991
config.publish_addresses = 0;
1053
992
config.publish_workstation = 0;
1054
993
config.publish_domain = 0;
1055
994
1056
995
/* Allocate a new server */
1057
996
mc.server = avahi_server_new(avahi_simple_poll_get
1058
997
(mc.simple_poll), &config, NULL,
1059
998
NULL, &error);
1060
999
1061
1000
/* Free the Avahi configuration data */
1062
1001
avahi_server_config_free(&config);
1063
1002
}
1064
1003
1065
1004
/* Check if creating the Avahi server object succeeded */
1066
if(mc.server == NULL) {
1005
if (mc.server == NULL) {
1067
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1068
1007
avahi_strerror(error));
1069
1008
exitcode = EXIT_FAILURE;
1075
1014
AVAHI_PROTO_INET6,
1076
1015
"_mandos._tcp", NULL, 0,
1077
1016
browse_callback, &mc);
1078
if(sb == NULL) {
1017
if (sb == NULL) {
1079
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1080
1019
avahi_strerror(avahi_server_errno(mc.server)));
1081
1020
exitcode = EXIT_FAILURE;
1083
1022
}
1084
1023
1085
1024
/* Run the main loop */
1086
1087
if(debug){
1025
1026
if (debug){
1088
1027
fprintf(stderr, "Starting Avahi loop search\n");
1089
1028
}
1090
1029
1091
1030
avahi_simple_poll_loop(mc.simple_poll);
1092
1031
1093
1032
end:
1094
1095
if(debug){
1033
1034
if (debug){
1096
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1097
1036
}
1098
1037
1099
1038
/* Cleanup things */
1100
if(sb != NULL)
1039
if (sb != NULL)
1101
1040
avahi_s_service_browser_free(sb);
1102
1041
1103
if(mc.server != NULL)
1042
if (mc.server != NULL)
1104
1043
avahi_server_free(mc.server);
1105
1106
if(mc.simple_poll != NULL)
1044
1045
if (mc.simple_poll != NULL)
1107
1046
avahi_simple_poll_free(mc.simple_poll);
1108
1109
if(gnutls_initialized){
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1110
1051
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
}
1052
gnutls_global_deinit ();
1161
1053
}
1162
1054
1163
1055
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0