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- Committer: Teddy Hogeborn
- Date: 2008-08-04 21:25:55 UTC
- Revision ID: teddy@fukt.bsnet.se-20080804212555-rm7xxjze65f8avy3
* server.py: Cosmetic changes.
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.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
#include <stdint.h> /* uint16_t, uint32_t */
41
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
45
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
56
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, SCNu16 */
61
#include <assert.h> /* assert() */
62
#include <errno.h> /* perror(), errno */
63
#include <time.h> /* time() */
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
64
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
SIOCSIFFLAGS, if_indextoname(),
66
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
getuid(), getgid(), setuid(),
70
setgid() */
71
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
73
#include <argp.h> /* struct argp_option, error_t, struct
74
argp_state, struct argp,
75
argp_parse(), ARGP_KEY_ARG,
76
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
45
SIOCSIFFLAGS */
77
46
78
/* Avahi */
79
/* All Avahi types, constants and functions
80
Avahi*, avahi_*,
81
AVAHI_* */
82
47
#include <avahi-core/core.h>
83
48
#include <avahi-core/lookup.h>
84
49
#include <avahi-core/log.h>
86
51
#include <avahi-common/malloc.h>
87
52
#include <avahi-common/error.h>
88
53
89
/* GnuTLS */
90
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
functions:
92
gnutls_*
93
init_gnutls_session(),
94
GNUTLS_* */
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
97
GNUTLS_OPENPGP_FMT_BASE64 */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
98
60
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
99
71
/* GPGME */
100
#include <gpgme.h> /* All GPGME types, constants and
101
functions:
102
gpgme_*
103
GPGME_PROTOCOL_OpenPGP,
104
GPG_ERR_NO_* */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
105
74
106
75
#define BUFFER_SIZE 256
107
76
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
112
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
113
79
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client " VERSION;
80
const char *argp_program_version = "mandosclient 0.9";
115
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
82
117
83
/* Used for passing in values through the Avahi callback functions */
122
88
unsigned int dh_bits;
123
89
gnutls_dh_params_t dh_params;
124
90
const char *priority;
125
gpgme_ctx_t ctx;
126
91
} mandos_context;
127
92
128
93
/*
132
97
*/
133
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
99
size_t buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
102
if (buffer == NULL){
138
103
return 0;
139
104
}
140
105
buffer_capacity += BUFFER_SIZE;
143
108
}
144
109
145
110
/*
146
* Initialize GPGME.
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
147
113
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
118
gpgme_data_t dh_crypto, dh_plain;
119
gpgme_ctx_t ctx;
151
120
gpgme_error_t rc;
121
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
152
124
gpgme_engine_info_t engine_info;
153
125
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");
126
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
128
}
193
129
194
130
/* Init GPGME */
195
131
gpgme_check_version(NULL);
196
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if(rc != GPG_ERR_NO_ERROR){
133
if (rc != GPG_ERR_NO_ERROR){
198
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
135
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
136
return -1;
201
137
}
202
138
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){
139
/* Set GPGME home directory for the OpenPGP engine only */
140
rc = gpgme_get_engine_info (&engine_info);
141
if (rc != GPG_ERR_NO_ERROR){
206
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
143
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
144
return -1;
209
145
}
210
146
while(engine_info != NULL){
211
147
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
148
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
149
engine_info->file_name, homedir);
214
150
break;
215
151
}
216
152
engine_info = engine_info->next;
217
153
}
218
154
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
return false;
221
}
222
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if(not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
236
}
237
238
/*
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
241
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
246
gpgme_data_t dh_crypto, dh_plain;
247
gpgme_error_t rc;
248
ssize_t ret;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
251
252
if(debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
156
return -1;
254
157
}
255
158
256
159
/* Create new GPGME data buffer from memory cryptotext */
257
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
161
0);
259
if(rc != GPG_ERR_NO_ERROR){
162
if (rc != GPG_ERR_NO_ERROR){
260
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
164
gpgme_strsource(rc), gpgme_strerror(rc));
262
165
return -1;
264
167
265
168
/* Create new empty GPGME data buffer for the plaintext */
266
169
rc = gpgme_data_new(&dh_plain);
267
if(rc != GPG_ERR_NO_ERROR){
170
if (rc != GPG_ERR_NO_ERROR){
268
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
172
gpgme_strsource(rc), gpgme_strerror(rc));
270
173
gpgme_data_release(dh_crypto);
271
174
return -1;
272
175
}
273
176
177
/* Create new GPGME "context" */
178
rc = gpgme_new(&ctx);
179
if (rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
184
}
185
274
186
/* Decrypt data from the cryptotext data buffer to the plaintext
275
187
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
if (rc != GPG_ERR_NO_ERROR){
278
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
191
gpgme_strsource(rc), gpgme_strerror(rc));
280
192
plaintext_length = -1;
281
if(debug){
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if(result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
293
}
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
306
}
307
}
308
}
309
193
goto decrypt_end;
310
194
}
311
195
313
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
198
}
315
199
200
if (debug){
201
gpgme_decrypt_result_t result;
202
result = gpgme_op_decrypt_result(ctx);
203
if (result == NULL){
204
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
205
} else {
206
fprintf(stderr, "Unsupported algorithm: %s\n",
207
result->unsupported_algorithm);
208
fprintf(stderr, "Wrong key usage: %d\n",
209
result->wrong_key_usage);
210
if(result->file_name != NULL){
211
fprintf(stderr, "File name: %s\n", result->file_name);
212
}
213
gpgme_recipient_t recipient;
214
recipient = result->recipients;
215
if(recipient){
216
while(recipient != NULL){
217
fprintf(stderr, "Public key algorithm: %s\n",
218
gpgme_pubkey_algo_name(recipient->pubkey_algo));
219
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
220
fprintf(stderr, "Secret key available: %s\n",
221
recipient->status == GPG_ERR_NO_SECKEY
222
? "No" : "Yes");
223
recipient = recipient->next;
224
}
225
}
226
}
227
}
228
316
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
319
232
plaintext_length = -1;
320
233
goto decrypt_end;
321
234
}
325
238
plaintext_capacity = adjustbuffer(plaintext,
326
239
(size_t)plaintext_length,
327
240
plaintext_capacity);
328
if(plaintext_capacity == 0){
241
if (plaintext_capacity == 0){
329
242
perror("adjustbuffer");
330
243
plaintext_length = -1;
331
244
goto decrypt_end;
334
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
248
BUFFER_SIZE);
336
249
/* Print the data, if any */
337
if(ret == 0){
250
if (ret == 0){
338
251
/* EOF */
339
252
break;
340
253
}
345
258
}
346
259
plaintext_length += ret;
347
260
}
348
261
349
262
if(debug){
350
263
fprintf(stderr, "Decrypted password is: ");
351
264
for(ssize_t i = 0; i < plaintext_length; i++){
364
277
return plaintext_length;
365
278
}
366
279
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning */
369
if(ret == NULL)
280
static const char * safer_gnutls_strerror (int value) {
281
const char *ret = gnutls_strerror (value);
282
if (ret == NULL)
370
283
ret = "(unknown)";
371
284
return ret;
372
285
}
378
291
}
379
292
380
293
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
294
const char *pubkeyfile,
295
const char *seckeyfile){
383
296
int ret;
384
297
385
298
if(debug){
386
299
fprintf(stderr, "Initializing GnuTLS\n");
387
300
}
388
389
ret = gnutls_global_init();
390
if(ret != GNUTLS_E_SUCCESS) {
391
fprintf(stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
301
302
if ((ret = gnutls_global_init ())
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
393
306
return -1;
394
307
}
395
308
396
if(debug){
309
if (debug){
397
310
/* "Use a log level over 10 to enable all debugging options."
398
311
* - GnuTLS manual
399
312
*/
402
315
}
403
316
404
317
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit();
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
321
safer_gnutls_strerror(ret));
411
322
return -1;
412
323
}
413
324
414
325
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
326
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
328
seckeyfile);
418
329
}
419
330
420
331
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
423
if(ret != GNUTLS_E_SUCCESS) {
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
333
if (ret != GNUTLS_E_SUCCESS) {
424
334
fprintf(stderr,
425
335
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
336
" '%s')\n", ret, pubkeyfile, seckeyfile);
337
fprintf(stdout, "The GnuTLS error is: %s\n",
428
338
safer_gnutls_strerror(ret));
429
goto globalfail;
339
return -1;
430
340
}
431
341
432
342
/* GnuTLS server initialization */
433
343
ret = gnutls_dh_params_init(&mc->dh_params);
434
if(ret != GNUTLS_E_SUCCESS) {
435
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
437
goto globalfail;
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
346
" %s\n", safer_gnutls_strerror(ret));
347
return -1;
438
348
}
439
349
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if(ret != GNUTLS_E_SUCCESS) {
441
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
443
goto globalfail;
350
if (ret != GNUTLS_E_SUCCESS) {
351
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
352
safer_gnutls_strerror(ret));
353
return -1;
444
354
}
445
355
446
356
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
447
357
448
358
return 0;
449
450
globalfail:
451
452
gnutls_certificate_free_credentials(mc->cred);
453
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
455
return -1;
456
359
}
457
360
458
361
static int init_gnutls_session(mandos_context *mc,
460
363
int ret;
461
364
/* GnuTLS session creation */
462
365
ret = gnutls_init(session, GNUTLS_SERVER);
463
if(ret != GNUTLS_E_SUCCESS){
366
if (ret != GNUTLS_E_SUCCESS){
464
367
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
368
safer_gnutls_strerror(ret));
466
369
}
468
371
{
469
372
const char *err;
470
373
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if(ret != GNUTLS_E_SUCCESS) {
374
if (ret != GNUTLS_E_SUCCESS) {
472
375
fprintf(stderr, "Syntax error at: %s\n", err);
473
376
fprintf(stderr, "GnuTLS error: %s\n",
474
377
safer_gnutls_strerror(ret));
475
gnutls_deinit(*session);
476
378
return -1;
477
379
}
478
380
}
479
381
480
382
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
383
mc->cred);
482
if(ret != GNUTLS_E_SUCCESS) {
384
if (ret != GNUTLS_E_SUCCESS) {
483
385
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
386
safer_gnutls_strerror(ret));
485
gnutls_deinit(*session);
486
387
return -1;
487
388
}
488
389
489
390
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request(*session,
491
GNUTLS_CERT_IGNORE);
391
gnutls_certificate_server_set_request (*session,
392
GNUTLS_CERT_IGNORE);
492
393
493
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
494
395
495
396
return 0;
496
397
}
504
405
AvahiIfIndex if_index,
505
406
mandos_context *mc){
506
407
int ret, tcp_sd;
507
ssize_t sret;
508
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
509
409
char *buffer = NULL;
510
410
char *decrypted_buffer;
516
416
char interface[IF_NAMESIZE];
517
417
gnutls_session_t session;
518
418
519
ret = init_gnutls_session(mc, &session);
520
if(ret != 0){
419
ret = init_gnutls_session (mc, &session);
420
if (ret != 0){
521
421
return -1;
522
422
}
523
423
524
424
if(debug){
525
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
526
"\n", ip, port);
425
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
426
ip, port);
527
427
}
528
428
529
429
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
531
431
perror("socket");
532
432
return -1;
533
433
}
534
434
535
435
if(debug){
536
436
if(if_indextoname((unsigned int)if_index, interface) == NULL){
537
437
perror("if_indextoname");
540
440
fprintf(stderr, "Binding to interface %s\n", interface);
541
441
}
542
442
543
memset(&to, 0, sizeof(to));
443
memset(&to,0,sizeof(to)); /* Spurious warning */
544
444
to.in6.sin6_family = AF_INET6;
545
445
/* It would be nice to have a way to detect if we were passed an
546
446
IPv4 address here. Now we assume an IPv6 address. */
547
447
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
548
if(ret < 0 ){
448
if (ret < 0 ){
549
449
perror("inet_pton");
550
450
return -1;
551
451
}
553
453
fprintf(stderr, "Bad address: %s\n", ip);
554
454
return -1;
555
455
}
556
to.in6.sin6_port = htons(port); /* Spurious warning */
456
to.in6.sin6_port = htons(port); /* Spurious warning */
557
457
558
458
to.in6.sin6_scope_id = (uint32_t)if_index;
559
459
560
460
if(debug){
561
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
562
port);
461
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
563
462
char addrstr[INET6_ADDRSTRLEN] = "";
564
463
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
565
464
sizeof(addrstr)) == NULL){
572
471
}
573
472
574
473
ret = connect(tcp_sd, &to.in, sizeof(to));
575
if(ret < 0){
474
if (ret < 0){
576
475
perror("connect");
577
476
return -1;
578
477
}
579
478
580
479
const char *out = mandos_protocol_version;
581
480
written = 0;
582
while(true){
481
while (true){
583
482
size_t out_size = strlen(out);
584
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
483
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
585
484
out_size - written));
586
if(ret == -1){
485
if (ret == -1){
587
486
perror("write");
588
487
retval = -1;
589
488
goto mandos_end;
592
491
if(written < out_size){
593
492
continue;
594
493
} else {
595
if(out == mandos_protocol_version){
494
if (out == mandos_protocol_version){
596
495
written = 0;
597
496
out = "\r\n";
598
497
} else {
600
499
}
601
500
}
602
501
}
603
502
604
503
if(debug){
605
504
fprintf(stderr, "Establishing TLS session with %s\n", ip);
606
505
}
607
506
608
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
609
610
do{
611
ret = gnutls_handshake(session);
612
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
613
614
if(ret != GNUTLS_E_SUCCESS){
507
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
508
509
ret = gnutls_handshake (session);
510
511
if (ret != GNUTLS_E_SUCCESS){
615
512
if(debug){
616
513
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
617
gnutls_perror(ret);
514
gnutls_perror (ret);
618
515
}
619
516
retval = -1;
620
517
goto mandos_end;
626
523
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
627
524
ip);
628
525
}
629
526
630
527
while(true){
631
528
buffer_capacity = adjustbuffer(&buffer, buffer_length,
632
529
buffer_capacity);
633
if(buffer_capacity == 0){
530
if (buffer_capacity == 0){
634
531
perror("adjustbuffer");
635
532
retval = -1;
636
533
goto mandos_end;
637
534
}
638
535
639
sret = gnutls_record_recv(session, buffer+buffer_length,
640
BUFFER_SIZE);
641
if(sret == 0){
536
ret = gnutls_record_recv(session, buffer+buffer_length,
537
BUFFER_SIZE);
538
if (ret == 0){
642
539
break;
643
540
}
644
if(sret < 0){
645
switch(sret){
541
if (ret < 0){
542
switch(ret){
646
543
case GNUTLS_E_INTERRUPTED:
647
544
case GNUTLS_E_AGAIN:
648
545
break;
649
546
case GNUTLS_E_REHANDSHAKE:
650
do{
651
ret = gnutls_handshake(session);
652
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
653
if(ret < 0){
547
ret = gnutls_handshake (session);
548
if (ret < 0){
654
549
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
655
gnutls_perror(ret);
550
gnutls_perror (ret);
656
551
retval = -1;
657
552
goto mandos_end;
658
553
}
661
556
fprintf(stderr, "Unknown error while reading data from"
662
557
" encrypted session with Mandos server\n");
663
558
retval = -1;
664
gnutls_bye(session, GNUTLS_SHUT_RDWR);
559
gnutls_bye (session, GNUTLS_SHUT_RDWR);
665
560
goto mandos_end;
666
561
}
667
562
} else {
668
buffer_length += (size_t) sret;
563
buffer_length += (size_t) ret;
669
564
}
670
565
}
671
566
673
568
fprintf(stderr, "Closing TLS session\n");
674
569
}
675
570
676
gnutls_bye(session, GNUTLS_SHUT_RDWR);
571
gnutls_bye (session, GNUTLS_SHUT_RDWR);
677
572
678
if(buffer_length > 0){
679
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
573
if (buffer_length > 0){
574
decrypted_buffer_size = pgp_packet_decrypt(buffer,
680
575
buffer_length,
681
&decrypted_buffer);
682
if(decrypted_buffer_size >= 0){
576
&decrypted_buffer,
577
keydir);
578
if (decrypted_buffer_size >= 0){
683
579
written = 0;
684
580
while(written < (size_t) decrypted_buffer_size){
685
ret = (int)fwrite(decrypted_buffer + written, 1,
686
(size_t)decrypted_buffer_size - written,
687
stdout);
581
ret = (int)fwrite (decrypted_buffer + written, 1,
582
(size_t)decrypted_buffer_size - written,
583
stdout);
688
584
if(ret == 0 and ferror(stdout)){
689
585
if(debug){
690
586
fprintf(stderr, "Error writing encrypted data: %s\n",
699
595
} else {
700
596
retval = -1;
701
597
}
702
} else {
703
retval = -1;
704
598
}
705
599
706
600
/* Shutdown procedure */
707
601
708
602
mandos_end:
709
603
free(buffer);
710
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
711
if(ret == -1){
712
perror("close");
713
}
714
gnutls_deinit(session);
604
close(tcp_sd);
605
gnutls_deinit (session);
606
gnutls_certificate_free_credentials (mc->cred);
607
gnutls_global_deinit ();
715
608
return retval;
716
609
}
717
610
730
623
flags,
731
624
void* userdata) {
732
625
mandos_context *mc = userdata;
733
assert(r);
626
assert(r); /* Spurious warning */
734
627
735
628
/* Called whenever a service has been resolved successfully or
736
629
timed out */
737
630
738
switch(event) {
631
switch (event) {
739
632
default:
740
633
case AVAHI_RESOLVER_FAILURE:
741
634
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
748
641
char ip[AVAHI_ADDRESS_STR_MAX];
749
642
avahi_address_snprint(ip, sizeof(ip), address);
750
643
if(debug){
751
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
752
PRIu16 ") on port %d\n", name, host_name, ip,
753
interface, port);
644
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
645
" port %d\n", name, host_name, ip, interface, port);
754
646
}
755
647
int ret = start_mandos_communication(ip, port, interface, mc);
756
if(ret == 0){
757
avahi_simple_poll_quit(mc->simple_poll);
648
if (ret == 0){
649
exit(EXIT_SUCCESS);
758
650
}
759
651
}
760
652
}
772
664
flags,
773
665
void* userdata) {
774
666
mandos_context *mc = userdata;
775
assert(b);
667
assert(b); /* Spurious warning */
776
668
777
669
/* Called whenever a new services becomes available on the LAN or
778
670
is removed from the LAN */
779
671
780
switch(event) {
672
switch (event) {
781
673
default:
782
674
case AVAHI_BROWSER_FAILURE:
783
675
792
684
the callback function is called the Avahi server will free the
793
685
resolver for us. */
794
686
795
if(!(avahi_s_service_resolver_new(mc->server, interface,
687
if (!(avahi_s_service_resolver_new(mc->server, interface,
796
688
protocol, name, type, domain,
797
689
AVAHI_PROTO_INET6, 0,
798
690
resolve_callback, mc)))
812
704
}
813
705
}
814
706
707
/* Combines file name and path and returns the malloced new
708
string. some sane checks could/should be added */
709
static const char *combinepath(const char *first, const char *second){
710
size_t f_len = strlen(first);
711
size_t s_len = strlen(second);
712
char *tmp = malloc(f_len + s_len + 2);
713
if (tmp == NULL){
714
return NULL;
715
}
716
if(f_len > 0){
717
memcpy(tmp, first, f_len); /* Spurious warning */
718
}
719
tmp[f_len] = '/';
720
if(s_len > 0){
721
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
722
}
723
tmp[f_len + 1 + s_len] = '\0';
724
return tmp;
725
}
726
727
815
728
int main(int argc, char *argv[]){
816
729
AvahiSServiceBrowser *sb = NULL;
817
730
int error;
823
736
uid_t uid;
824
737
gid_t gid;
825
738
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
827
739
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
830
740
const char *pubkeyfile = "pubkey.txt";
741
const char *seckeyfile = "seckey.txt";
831
742
mandos_context mc = { .simple_poll = NULL, .server = NULL,
832
.dh_bits = 1024, .priority = "SECURE256"
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
834
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
743
.dh_bits = 1024, .priority = "SECURE256"};
836
744
837
745
{
838
746
struct argp_option options[] = {
839
747
{ .name = "debug", .key = 128,
840
748
.doc = "Debug mode", .group = 3 },
841
749
{ .name = "connect", .key = 'c',
842
.arg = "ADDRESS:PORT",
843
.doc = "Connect directly to a specific Mandos server",
750
.arg = "IP",
751
.doc = "Connect directly to a sepcified mandos server",
844
752
.group = 1 },
845
753
{ .name = "interface", .key = 'i',
846
.arg = "NAME",
847
.doc = "Interface that will be used to search for Mandos"
848
" servers",
754
.arg = "INTERFACE",
755
.doc = "Interface that Avahi will conntect through",
756
.group = 1 },
757
{ .name = "keydir", .key = 'd',
758
.arg = "KEYDIR",
759
.doc = "Directory where the openpgp keyring is",
849
760
.group = 1 },
850
761
{ .name = "seckey", .key = 's',
851
.arg = "FILE",
852
.doc = "OpenPGP secret key file base name",
762
.arg = "SECKEY",
763
.doc = "Secret openpgp key for gnutls authentication",
853
764
.group = 1 },
854
765
{ .name = "pubkey", .key = 'p',
855
.arg = "FILE",
856
.doc = "OpenPGP public key file base name",
766
.arg = "PUBKEY",
767
.doc = "Public openpgp key for gnutls authentication",
857
768
.group = 2 },
858
769
{ .name = "dh-bits", .key = 129,
859
770
.arg = "BITS",
860
.doc = "Bit length of the prime number used in the"
861
" Diffie-Hellman key exchange",
771
.doc = "dh-bits to use in gnutls communication",
862
772
.group = 2 },
863
773
{ .name = "priority", .key = 130,
864
.arg = "STRING",
865
.doc = "GnuTLS priority string for the TLS handshake",
866
.group = 1 },
774
.arg = "PRIORITY",
775
.doc = "GNUTLS priority", .group = 1 },
867
776
{ .name = NULL }
868
777
};
778
869
779
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
872
switch(key) {
873
case 128: /* --debug */
780
error_t parse_opt (int key, char *arg,
781
struct argp_state *state) {
782
/* Get the INPUT argument from `argp_parse', which we know is
783
a pointer to our plugin list pointer. */
784
switch (key) {
785
case 128:
874
786
debug = true;
875
787
break;
876
case 'c': /* --connect */
788
case 'c':
877
789
connect_to = arg;
878
790
break;
879
case 'i': /* --interface */
791
case 'i':
880
792
interface = arg;
881
793
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
ret = sscanf(arg, "%u", &mc.dh_bits);
890
if(ret != 1){
891
fprintf(stderr, "Bad number of DH bits\n");
794
case 'd':
795
keydir = arg;
796
break;
797
case 's':
798
seckeyfile = arg;
799
break;
800
case 'p':
801
pubkeyfile = arg;
802
break;
803
case 129:
804
errno = 0;
805
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
806
if (errno){
807
perror("strtol");
892
808
exit(EXIT_FAILURE);
893
809
}
894
810
break;
895
case 130: /* --priority */
811
case 130:
896
812
mc.priority = arg;
897
813
break;
898
814
case ARGP_KEY_ARG:
899
argp_usage(state);
900
case ARGP_KEY_END:
815
argp_usage (state);
901
816
break;
817
case ARGP_KEY_END:
818
break;
902
819
default:
903
820
return ARGP_ERR_UNKNOWN;
904
821
}
905
822
return 0;
906
823
}
907
824
908
825
struct argp argp = { .options = options, .parser = parse_opt,
909
826
.args_doc = "",
910
827
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
920
/* If the interface is down, bring it up */
921
{
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
if(sd < 0) {
924
perror("socket");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
if(ret == -1){
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
933
goto end;
934
}
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
if(ret == -1){
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
941
goto end;
942
}
943
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
948
}
949
828
" passwords from mandos server" };
829
argp_parse (&argp, argc, argv, 0, 0, NULL);
830
}
831
832
pubkeyfile = combinepath(keydir, pubkeyfile);
833
if (pubkeyfile == NULL){
834
perror("combinepath");
835
exitcode = EXIT_FAILURE;
836
goto end;
837
}
838
839
seckeyfile = combinepath(keydir, seckeyfile);
840
if (seckeyfile == NULL){
841
perror("combinepath");
842
goto end;
843
}
844
845
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
846
if (ret == -1){
847
fprintf(stderr, "init_gnutls_global\n");
848
goto end;
849
}
850
950
851
uid = getuid();
951
852
gid = getgid();
952
853
953
854
ret = setuid(uid);
954
if(ret == -1){
855
if (ret == -1){
955
856
perror("setuid");
956
857
}
957
858
958
859
setgid(gid);
959
if(ret == -1){
860
if (ret == -1){
960
861
perror("setgid");
961
862
}
962
863
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if(ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
984
}
985
986
864
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
865
if(if_index == 0){
988
866
fprintf(stderr, "No such interface: \"%s\"\n", interface);
998
876
exitcode = EXIT_FAILURE;
999
877
goto end;
1000
878
}
1001
uint16_t port;
1002
ret = sscanf(address+1, "%" SCNu16, &port);
1003
if(ret != 1){
1004
fprintf(stderr, "Bad port number\n");
879
errno = 0;
880
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
881
if(errno){
882
perror("Bad port number");
1005
883
exitcode = EXIT_FAILURE;
1006
884
goto end;
1007
885
}
1016
894
goto end;
1017
895
}
1018
896
1019
if(not debug){
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
if(ret == -1){
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
close(sd);
922
}
923
924
if (not debug){
1020
925
avahi_set_log_function(empty_log);
1021
926
}
1022
927
1025
930
1026
931
/* Allocate main Avahi loop object */
1027
932
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL) {
933
if (mc.simple_poll == NULL) {
1029
934
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
935
" object.\n");
1031
936
exitcode = EXIT_FAILURE;
1032
937
goto end;
1033
938
}
1034
939
1035
940
{
1036
941
AvahiServerConfig config;
1037
942
/* Do not publish any local Zeroconf records */
1040
945
config.publish_addresses = 0;
1041
946
config.publish_workstation = 0;
1042
947
config.publish_domain = 0;
1043
948
1044
949
/* Allocate a new server */
1045
950
mc.server = avahi_server_new(avahi_simple_poll_get
1046
951
(mc.simple_poll), &config, NULL,
1047
952
NULL, &error);
1048
953
1049
954
/* Free the Avahi configuration data */
1050
955
avahi_server_config_free(&config);
1051
956
}
1052
957
1053
958
/* Check if creating the Avahi server object succeeded */
1054
if(mc.server == NULL) {
959
if (mc.server == NULL) {
1055
960
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
961
avahi_strerror(error));
1057
962
exitcode = EXIT_FAILURE;
1063
968
AVAHI_PROTO_INET6,
1064
969
"_mandos._tcp", NULL, 0,
1065
970
browse_callback, &mc);
1066
if(sb == NULL) {
971
if (sb == NULL) {
1067
972
fprintf(stderr, "Failed to create service browser: %s\n",
1068
973
avahi_strerror(avahi_server_errno(mc.server)));
1069
974
exitcode = EXIT_FAILURE;
1071
976
}
1072
977
1073
978
/* Run the main loop */
1074
1075
if(debug){
979
980
if (debug){
1076
981
fprintf(stderr, "Starting Avahi loop search\n");
1077
982
}
1078
983
1079
984
avahi_simple_poll_loop(mc.simple_poll);
1080
985
1081
986
end:
1082
1083
if(debug){
987
988
if (debug){
1084
989
fprintf(stderr, "%s exiting\n", argv[0]);
1085
990
}
1086
991
1087
992
/* Cleanup things */
1088
if(sb != NULL)
993
if (sb != NULL)
1089
994
avahi_s_service_browser_free(sb);
1090
995
1091
if(mc.server != NULL)
996
if (mc.server != NULL)
1092
997
avahi_server_free(mc.server);
1093
1094
if(mc.simple_poll != NULL)
998
999
if (mc.simple_poll != NULL)
1095
1000
avahi_simple_poll_free(mc.simple_poll);
1096
1097
if(gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
if(errno != ENOENT){
1114
perror("opendir");
1115
}
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if(direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1 and errno != ENOENT){
1142
perror("rmdir");
1143
}
1144
}
1145
1001
free(pubkeyfile);
1002
free(seckeyfile);
1003
1146
1004
return exitcode;
1147
1005
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0