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- Committer: Teddy Hogeborn
- Date: 2009-01-15 02:52:02 UTC
- Revision ID: teddy@fukt.bsnet.se-20090115025202-utyjssfivzumvw7m
* debian/watch: New file.
* debian/mandos-client.README.Debian (Emergency Escape): New section;
document the
"mandos=off"
kernel
parameter.
* initramfs-tools-script: Exit if kernel has parameter "mandos=off".
* debian/mandos-client.README.Debian (Emergency Escape): New section;
document the
"mandos=off"
kernel
parameter.
* initramfs-tools-script: Exit if kernel has parameter "mandos=off".
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
39
40
#include <stdint.h> /* uint16_t, uint32_t */
40
41
#include <stddef.h> /* NULL, size_t, ssize_t */
41
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
43
srand() */
43
44
#include <stdbool.h> /* bool, true */
44
45
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
46
strerror(), asprintf(), strcpy() */
46
47
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
49
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
49
sockaddr_in6, PF_INET6,
51
50
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
53
#include <inttypes.h> /* PRIu16 */
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
54
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
55
struct in6_addr, inet_pton(),
56
56
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
57
61
#include <assert.h> /* assert() */
58
62
#include <errno.h> /* perror(), errno */
59
63
#include <time.h> /* time() */
60
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
61
65
SIOCSIFFLAGS, if_indextoname(),
62
66
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
63
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
64
69
getuid(), getgid(), setuid(),
65
70
setgid() */
66
#include <netinet/in.h>
67
71
#include <arpa/inet.h> /* inet_pton(), htons */
68
#include <iso646.h> /* not, and */
72
#include <iso646.h> /* not, and, or */
69
73
#include <argp.h> /* struct argp_option, error_t, struct
70
74
argp_state, struct argp,
71
75
argp_parse(), ARGP_KEY_ARG,
83
87
#include <avahi-common/error.h>
84
88
85
89
/* GnuTLS */
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
90
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
functions:
87
92
gnutls_*
88
93
init_gnutls_session(),
89
94
GNUTLS_* */
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
91
97
GNUTLS_OPENPGP_FMT_BASE64 */
92
98
93
99
/* GPGME */
94
#include <gpgme.h> /* All GPGME types, constants and functions
100
#include <gpgme.h> /* All GPGME types, constants and
101
functions:
95
102
gpgme_*
96
103
GPGME_PROTOCOL_OpenPGP,
97
104
GPG_ERR_NO_* */
98
105
99
106
#define BUFFER_SIZE 256
100
107
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
101
112
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
113
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
114
const char *argp_program_version = "mandos-client " VERSION;
105
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
116
107
117
/* Used for passing in values through the Avahi callback functions */
112
122
unsigned int dh_bits;
113
123
gnutls_dh_params_t dh_params;
114
124
const char *priority;
125
gpgme_ctx_t ctx;
115
126
} mandos_context;
116
127
117
128
/*
121
132
*/
122
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
134
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
137
if(buffer == NULL){
127
138
return 0;
128
139
}
129
140
buffer_capacity += BUFFER_SIZE;
132
143
}
133
144
134
145
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
146
* Initialize GPGME.
137
147
*/
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;
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
144
151
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
152
gpgme_engine_info_t engine_info;
149
153
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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");
152
192
}
153
193
154
194
/* Init GPGME */
155
195
gpgme_check_version(NULL);
156
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
197
if(rc != GPG_ERR_NO_ERROR){
158
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
199
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
200
return false;
161
201
}
162
202
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){
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){
166
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
207
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
208
return false;
169
209
}
170
210
while(engine_info != NULL){
171
211
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
212
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
213
engine_info->file_name, tempdir);
174
214
break;
175
215
}
176
216
engine_info = engine_info->next;
177
217
}
178
218
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
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");
181
254
}
182
255
183
256
/* Create new GPGME data buffer from memory cryptotext */
184
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
258
0);
186
if (rc != GPG_ERR_NO_ERROR){
259
if(rc != GPG_ERR_NO_ERROR){
187
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
261
gpgme_strsource(rc), gpgme_strerror(rc));
189
262
return -1;
191
264
192
265
/* Create new empty GPGME data buffer for the plaintext */
193
266
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
267
if(rc != GPG_ERR_NO_ERROR){
195
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
269
gpgme_strsource(rc), gpgme_strerror(rc));
197
270
gpgme_data_release(dh_crypto);
198
271
return -1;
199
272
}
200
273
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
210
274
/* Decrypt data from the cryptotext data buffer to the plaintext
211
275
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
214
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
279
gpgme_strsource(rc), gpgme_strerror(rc));
216
280
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
}
217
309
goto decrypt_end;
218
310
}
219
311
221
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
314
}
223
315
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
253
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
256
319
plaintext_length = -1;
257
320
goto decrypt_end;
258
321
}
262
325
plaintext_capacity = adjustbuffer(plaintext,
263
326
(size_t)plaintext_length,
264
327
plaintext_capacity);
265
if (plaintext_capacity == 0){
328
if(plaintext_capacity == 0){
266
329
perror("adjustbuffer");
267
330
plaintext_length = -1;
268
331
goto decrypt_end;
271
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
335
BUFFER_SIZE);
273
336
/* Print the data, if any */
274
if (ret == 0){
337
if(ret == 0){
275
338
/* EOF */
276
339
break;
277
340
}
282
345
}
283
346
plaintext_length += ret;
284
347
}
285
348
286
349
if(debug){
287
350
fprintf(stderr, "Decrypted password is: ");
288
351
for(ssize_t i = 0; i < plaintext_length; i++){
301
364
return plaintext_length;
302
365
}
303
366
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
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)
307
371
ret = "(unknown)";
308
372
return ret;
309
373
}
315
379
}
316
380
317
381
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfile,
319
const char *seckeyfile){
382
const char *pubkeyfilename,
383
const char *seckeyfilename){
320
384
int ret;
321
385
322
386
if(debug){
324
388
}
325
389
326
390
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
330
394
return -1;
331
395
}
332
396
333
if (debug){
397
if(debug){
334
398
/* "Use a log level over 10 to enable all debugging options."
335
399
* - GnuTLS manual
336
400
*/
340
404
341
405
/* OpenPGP credentials */
342
406
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
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();
347
414
return -1;
348
415
}
349
416
350
417
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
353
seckeyfile);
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
420
seckeyfilename);
354
421
}
355
422
356
423
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
424
(mc->cred, pubkeyfilename, seckeyfilename,
425
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
359
427
fprintf(stderr,
360
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
363
431
safer_gnutls_strerror(ret));
364
432
goto globalfail;
365
433
}
366
434
367
435
/* GnuTLS server initialization */
368
436
ret = gnutls_dh_params_init(&mc->dh_params);
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
372
440
goto globalfail;
373
441
}
374
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
378
446
goto globalfail;
379
447
}
380
448
381
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
382
450
383
451
return 0;
384
452
385
453
globalfail:
386
454
387
455
gnutls_certificate_free_credentials(mc->cred);
388
456
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
389
458
return -1;
390
391
459
}
392
460
393
461
static int init_gnutls_session(mandos_context *mc,
395
463
int ret;
396
464
/* GnuTLS session creation */
397
465
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
466
if(ret != GNUTLS_E_SUCCESS){
399
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
468
safer_gnutls_strerror(ret));
401
469
}
403
471
{
404
472
const char *err;
405
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
474
if(ret != GNUTLS_E_SUCCESS) {
407
475
fprintf(stderr, "Syntax error at: %s\n", err);
408
476
fprintf(stderr, "GnuTLS error: %s\n",
409
477
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
478
gnutls_deinit(*session);
411
479
return -1;
412
480
}
413
481
}
414
482
415
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
484
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
485
if(ret != GNUTLS_E_SUCCESS) {
418
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
487
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
488
gnutls_deinit(*session);
421
489
return -1;
422
490
}
423
491
424
492
/* ignore client certificate if any. */
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
427
495
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
497
430
498
return 0;
431
499
}
439
507
AvahiIfIndex if_index,
440
508
mandos_context *mc){
441
509
int ret, tcp_sd;
510
ssize_t sret;
442
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
443
512
char *buffer = NULL;
444
513
char *decrypted_buffer;
450
519
char interface[IF_NAMESIZE];
451
520
gnutls_session_t session;
452
521
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
455
524
return -1;
456
525
}
457
526
465
534
perror("socket");
466
535
return -1;
467
536
}
468
537
469
538
if(debug){
470
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
540
perror("if_indextoname");
474
543
fprintf(stderr, "Binding to interface %s\n", interface);
475
544
}
476
545
477
memset(&to,0,sizeof(to)); /* Spurious warning */
546
memset(&to, 0, sizeof(to));
478
547
to.in6.sin6_family = AF_INET6;
479
548
/* It would be nice to have a way to detect if we were passed an
480
549
IPv4 address here. Now we assume an IPv6 address. */
481
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
551
if(ret < 0 ){
483
552
perror("inet_pton");
484
553
return -1;
485
554
}
487
556
fprintf(stderr, "Bad address: %s\n", ip);
488
557
return -1;
489
558
}
490
to.in6.sin6_port = htons(port); /* Spurious warning */
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
491
562
492
563
to.in6.sin6_scope_id = (uint32_t)if_index;
493
564
506
577
}
507
578
508
579
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
580
if(ret < 0){
510
581
perror("connect");
511
582
return -1;
512
583
}
513
584
514
585
const char *out = mandos_protocol_version;
515
586
written = 0;
516
while (true){
587
while(true){
517
588
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
590
out_size - written));
520
if (ret == -1){
591
if(ret == -1){
521
592
perror("write");
522
593
retval = -1;
523
594
goto mandos_end;
526
597
if(written < out_size){
527
598
continue;
528
599
} else {
529
if (out == mandos_protocol_version){
600
if(out == mandos_protocol_version){
530
601
written = 0;
531
602
out = "\r\n";
532
603
} else {
534
605
}
535
606
}
536
607
}
537
608
538
609
if(debug){
539
610
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
611
}
541
612
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
544
615
do{
545
ret = gnutls_handshake (session);
616
ret = gnutls_handshake(session);
546
617
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
547
618
548
if (ret != GNUTLS_E_SUCCESS){
619
if(ret != GNUTLS_E_SUCCESS){
549
620
if(debug){
550
621
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
551
gnutls_perror (ret);
622
gnutls_perror(ret);
552
623
}
553
624
retval = -1;
554
625
goto mandos_end;
560
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
561
632
ip);
562
633
}
563
634
564
635
while(true){
565
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
566
637
buffer_capacity);
567
if (buffer_capacity == 0){
638
if(buffer_capacity == 0){
568
639
perror("adjustbuffer");
569
640
retval = -1;
570
641
goto mandos_end;
571
642
}
572
643
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
576
647
break;
577
648
}
578
if (ret < 0){
579
switch(ret){
649
if(sret < 0){
650
switch(sret){
580
651
case GNUTLS_E_INTERRUPTED:
581
652
case GNUTLS_E_AGAIN:
582
653
break;
583
654
case GNUTLS_E_REHANDSHAKE:
584
655
do{
585
ret = gnutls_handshake (session);
656
ret = gnutls_handshake(session);
586
657
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
587
if (ret < 0){
658
if(ret < 0){
588
659
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
589
gnutls_perror (ret);
660
gnutls_perror(ret);
590
661
retval = -1;
591
662
goto mandos_end;
592
663
}
595
666
fprintf(stderr, "Unknown error while reading data from"
596
667
" encrypted session with Mandos server\n");
597
668
retval = -1;
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
670
goto mandos_end;
600
671
}
601
672
} else {
602
buffer_length += (size_t) ret;
673
buffer_length += (size_t) sret;
603
674
}
604
675
}
605
676
607
678
fprintf(stderr, "Closing TLS session\n");
608
679
}
609
680
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
682
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
614
685
buffer_length,
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
618
688
written = 0;
619
689
while(written < (size_t) decrypted_buffer_size){
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
623
693
if(ret == 0 and ferror(stdout)){
624
694
if(debug){
625
695
fprintf(stderr, "Error writing encrypted data: %s\n",
634
704
} else {
635
705
retval = -1;
636
706
}
707
} else {
708
retval = -1;
637
709
}
638
710
639
711
/* Shutdown procedure */
640
712
641
713
mandos_end:
642
714
free(buffer);
643
close(tcp_sd);
644
gnutls_deinit (session);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
645
720
return retval;
646
721
}
647
722
660
735
flags,
661
736
void* userdata) {
662
737
mandos_context *mc = userdata;
663
assert(r); /* Spurious warning */
738
assert(r);
664
739
665
740
/* Called whenever a service has been resolved successfully or
666
741
timed out */
667
742
668
switch (event) {
743
switch(event) {
669
744
default:
670
745
case AVAHI_RESOLVER_FAILURE:
671
746
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
679
754
avahi_address_snprint(ip, sizeof(ip), address);
680
755
if(debug){
681
756
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
682
PRIu16 ") on port %d\n", name, host_name, ip,
683
interface, port);
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
684
759
}
685
760
int ret = start_mandos_communication(ip, port, interface, mc);
686
if (ret == 0){
687
exit(EXIT_SUCCESS);
761
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
688
763
}
689
764
}
690
765
}
702
777
flags,
703
778
void* userdata) {
704
779
mandos_context *mc = userdata;
705
assert(b); /* Spurious warning */
780
assert(b);
706
781
707
782
/* Called whenever a new services becomes available on the LAN or
708
783
is removed from the LAN */
709
784
710
switch (event) {
785
switch(event) {
711
786
default:
712
787
case AVAHI_BROWSER_FAILURE:
713
788
722
797
the callback function is called the Avahi server will free the
723
798
resolver for us. */
724
799
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
726
801
protocol, name, type, domain,
727
802
AVAHI_PROTO_INET6, 0,
728
803
resolve_callback, mc)))
742
817
}
743
818
}
744
819
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
751
if (tmp == NULL){
752
return NULL;
753
}
754
if(f_len > 0){
755
memcpy(tmp, first, f_len); /* Spurious warning */
756
}
757
tmp[f_len] = '/';
758
if(s_len > 0){
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
760
}
761
tmp[f_len + 1 + s_len] = '\0';
762
return tmp;
763
}
764
765
766
820
int main(int argc, char *argv[]){
767
821
AvahiSServiceBrowser *sb = NULL;
768
822
int error;
769
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
770
826
int exitcode = EXIT_SUCCESS;
771
827
const char *interface = "eth0";
772
828
struct ifreq network;
774
830
uid_t uid;
775
831
gid_t gid;
776
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
777
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
780
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
782
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
783
843
784
844
{
785
845
struct argp_option options[] = {
786
846
{ .name = "debug", .key = 128,
787
847
.doc = "Debug mode", .group = 3 },
788
848
{ .name = "connect", .key = 'c',
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
791
851
.group = 1 },
792
852
{ .name = "interface", .key = 'i',
793
.arg = "INTERFACE",
794
.doc = "Interface that Avahi will conntect through",
795
.group = 1 },
796
{ .name = "keydir", .key = 'd',
797
.arg = "KEYDIR",
798
.doc = "Directory where the openpgp keyring is",
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
799
856
.group = 1 },
800
857
{ .name = "seckey", .key = 's',
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
803
860
.group = 1 },
804
861
{ .name = "pubkey", .key = 'p',
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
807
864
.group = 2 },
808
865
{ .name = "dh-bits", .key = 129,
809
866
.arg = "BITS",
810
.doc = "dh-bits to use in gnutls communication",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
811
869
.group = 2 },
812
870
{ .name = "priority", .key = 130,
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
815
874
{ .name = NULL }
816
875
};
817
818
876
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
823
switch (key) {
824
case 128:
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
825
881
debug = true;
826
882
break;
827
case 'c':
883
case 'c': /* --connect */
828
884
connect_to = arg;
829
885
break;
830
case 'i':
886
case 'i': /* --interface */
831
887
interface = arg;
832
888
break;
833
case 'd':
834
keydir = arg;
835
break;
836
case 's':
837
seckeyfile = arg;
838
break;
839
case 'p':
840
pubkeyfile = arg;
841
break;
842
case 129:
843
errno = 0;
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
845
if (errno){
846
perror("strtol");
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");
847
900
exit(EXIT_FAILURE);
848
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
849
903
break;
850
case 130:
904
case 130: /* --priority */
851
905
mc.priority = arg;
852
906
break;
853
907
case ARGP_KEY_ARG:
854
argp_usage (state);
908
argp_usage(state);
909
case ARGP_KEY_END:
855
910
break;
856
case ARGP_KEY_END:
857
break;
858
911
default:
859
912
return ARGP_ERR_UNKNOWN;
860
913
}
861
914
return 0;
862
915
}
863
916
864
917
struct argp argp = { .options = options, .parser = parse_opt,
865
918
.args_doc = "",
866
919
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
871
exitcode = EXIT_FAILURE;
872
goto end;
873
}
874
}
875
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
886
goto end;
887
}
888
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
890
if (ret == -1){
891
fprintf(stderr, "init_gnutls_global\n");
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
}
928
929
/* If the interface is down, bring it up */
930
{
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
932
if(sd < 0) {
933
perror("socket");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
strcpy(network.ifr_name, interface);
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCGIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
947
if(ret == -1){
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
957
}
958
897
959
uid = getuid();
898
960
gid = getgid();
899
961
900
962
ret = setuid(uid);
901
if (ret == -1){
963
if(ret == -1){
902
964
perror("setuid");
903
965
}
904
966
905
967
setgid(gid);
906
if (ret == -1){
968
if(ret == -1){
907
969
perror("setgid");
908
970
}
909
971
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_initalized = 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, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
910
995
if_index = (AvahiIfIndex) if_nametoindex(interface);
911
996
if(if_index == 0){
912
997
fprintf(stderr, "No such interface: \"%s\"\n", interface);
922
1007
exitcode = EXIT_FAILURE;
923
1008
goto end;
924
1009
}
925
errno = 0;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
927
if(errno){
928
perror("Bad port number");
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");
929
1015
exitcode = EXIT_FAILURE;
930
1016
goto end;
931
1017
}
1018
port = (uint16_t)tmpmax;
932
1019
*address = '\0';
933
1020
address = connect_to;
934
1021
ret = start_mandos_communication(address, port, if_index, &mc);
940
1027
goto end;
941
1028
}
942
1029
943
/* If the interface is down, bring it up */
944
{
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
946
if(sd < 0) {
947
perror("socket");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
953
if(ret == -1){
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
961
if(ret == -1){
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
964
goto end;
965
}
966
}
967
close(sd);
968
}
969
970
if (not debug){
1030
if(not debug){
971
1031
avahi_set_log_function(empty_log);
972
1032
}
973
1033
976
1036
977
1037
/* Allocate main Avahi loop object */
978
1038
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
1039
if(mc.simple_poll == NULL) {
980
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
981
1041
" object.\n");
982
1042
exitcode = EXIT_FAILURE;
983
1043
goto end;
984
1044
}
985
1045
986
1046
{
987
1047
AvahiServerConfig config;
988
1048
/* Do not publish any local Zeroconf records */
991
1051
config.publish_addresses = 0;
992
1052
config.publish_workstation = 0;
993
1053
config.publish_domain = 0;
994
1054
995
1055
/* Allocate a new server */
996
1056
mc.server = avahi_server_new(avahi_simple_poll_get
997
1057
(mc.simple_poll), &config, NULL,
998
1058
NULL, &error);
999
1059
1000
1060
/* Free the Avahi configuration data */
1001
1061
avahi_server_config_free(&config);
1002
1062
}
1003
1063
1004
1064
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1065
if(mc.server == NULL) {
1006
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
1067
avahi_strerror(error));
1008
1068
exitcode = EXIT_FAILURE;
1014
1074
AVAHI_PROTO_INET6,
1015
1075
"_mandos._tcp", NULL, 0,
1016
1076
browse_callback, &mc);
1017
if (sb == NULL) {
1077
if(sb == NULL) {
1018
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1019
1079
avahi_strerror(avahi_server_errno(mc.server)));
1020
1080
exitcode = EXIT_FAILURE;
1022
1082
}
1023
1083
1024
1084
/* Run the main loop */
1025
1026
if (debug){
1085
1086
if(debug){
1027
1087
fprintf(stderr, "Starting Avahi loop search\n");
1028
1088
}
1029
1089
1030
1090
avahi_simple_poll_loop(mc.simple_poll);
1031
1091
1032
1092
end:
1033
1034
if (debug){
1093
1094
if(debug){
1035
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1036
1096
}
1037
1097
1038
1098
/* Cleanup things */
1039
if (sb != NULL)
1099
if(sb != NULL)
1040
1100
avahi_s_service_browser_free(sb);
1041
1101
1042
if (mc.server != NULL)
1102
if(mc.server != NULL)
1043
1103
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1104
1105
if(mc.simple_poll != NULL)
1046
1106
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1107
1108
if(gnutls_initalized){
1051
1109
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
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
1055
1157
return exitcode;
1056
1158
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0