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24.1.38
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: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-10 01:10:04 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 59.
- Revision ID: belorn@braxen-20080810011004-4ngszt5wxu3opctk
changed description to better fit role
- 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
#include <stdbool.h> /* bool, false, true */
43
#include <stdbool.h> /* bool, true */
46
44
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
49
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
54
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
54
struct in6_addr, inet_pton(),
55
connect() */
60
56
#include <assert.h> /* assert() */
61
57
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
58
#include <time.h> /* time() */
63
59
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
60
SIOCSIFFLAGS, if_indextoname(),
65
61
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
62
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
63
getuid(), getgid(), setuid(),
71
64
setgid() */
65
#include <netinet/in.h>
72
66
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
67
#include <iso646.h> /* not, and */
74
68
#include <argp.h> /* struct argp_option, error_t, struct
75
69
argp_state, struct argp,
76
70
argp_parse(), ARGP_KEY_ARG,
77
71
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
79
#ifdef __linux__
80
#include <sys/klog.h> /* klogctl() */
81
#endif
82
72
83
73
/* Avahi */
84
74
/* All Avahi types, constants and functions
92
82
#include <avahi-common/error.h>
93
83
94
84
/* GnuTLS */
95
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
96
functions:
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
97
86
gnutls_*
98
87
init_gnutls_session(),
99
88
GNUTLS_* */
100
#include <gnutls/openpgp.h>
101
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
102
90
GNUTLS_OPENPGP_FMT_BASE64 */
103
91
104
92
/* GPGME */
105
#include <gpgme.h> /* All GPGME types, constants and
106
functions:
93
#include <gpgme.h> /* All GPGME types, constants and functions
107
94
gpgme_*
108
95
GPGME_PROTOCOL_OpenPGP,
109
96
GPG_ERR_NO_* */
110
97
111
98
#define BUFFER_SIZE 256
112
99
113
#define PATHDIR "/conf/conf.d/mandos"
114
#define SECKEY "seckey.txt"
115
#define PUBKEY "pubkey.txt"
116
117
100
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
118
102
static const char mandos_protocol_version[] = "1";
119
const char *argp_program_version = "mandos-client " VERSION;
103
const char *argp_program_version = "password-request 1.0";
120
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
121
105
122
106
/* Used for passing in values through the Avahi callback functions */
127
111
unsigned int dh_bits;
128
112
gnutls_dh_params_t dh_params;
129
113
const char *priority;
130
gpgme_ctx_t ctx;
131
114
} mandos_context;
132
115
133
/* global context so signal handler can reach it*/
134
mandos_context mc;
135
136
116
/*
137
* Make additional room in "buffer" for at least BUFFER_SIZE
138
* additional bytes. "buffer_capacity" is how much is currently
139
* allocated, "buffer_length" is how much is already used.
117
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* "buffer_capacity" is how much is currently allocated,
119
* "buffer_length" is how much is already used.
140
120
*/
141
size_t incbuffer(char **buffer, size_t buffer_length,
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
142
122
size_t buffer_capacity){
143
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
144
124
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
145
if(buffer == NULL){
125
if (buffer == NULL){
146
126
return 0;
147
127
}
148
128
buffer_capacity += BUFFER_SIZE;
151
131
}
152
132
153
133
/*
154
* Initialize GPGME.
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
155
136
*/
156
static bool init_gpgme(const char *seckey,
157
const char *pubkey, const char *tempdir){
158
int ret;
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
138
size_t crypto_size,
139
char **plaintext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
142
gpgme_ctx_t ctx;
159
143
gpgme_error_t rc;
144
ssize_t ret;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
160
147
gpgme_engine_info_t engine_info;
161
148
162
163
/*
164
* Helper function to insert pub and seckey to the engine keyring.
165
*/
166
bool import_key(const char *filename){
167
int fd;
168
gpgme_data_t pgp_data;
169
170
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
171
if(fd == -1){
172
perror("open");
173
return false;
174
}
175
176
rc = gpgme_data_new_from_fd(&pgp_data, fd);
177
if(rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
return false;
181
}
182
183
rc = gpgme_op_import(mc.ctx, pgp_data);
184
if(rc != GPG_ERR_NO_ERROR){
185
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
186
gpgme_strsource(rc), gpgme_strerror(rc));
187
return false;
188
}
189
190
ret = (int)TEMP_FAILURE_RETRY(close(fd));
191
if(ret == -1){
192
perror("close");
193
}
194
gpgme_data_release(pgp_data);
195
return true;
196
}
197
198
if(debug){
199
fprintf(stderr, "Initialize gpgme\n");
149
if (debug){
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
200
151
}
201
152
202
153
/* Init GPGME */
203
154
gpgme_check_version(NULL);
204
155
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
205
if(rc != GPG_ERR_NO_ERROR){
156
if (rc != GPG_ERR_NO_ERROR){
206
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
207
158
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
159
return -1;
209
160
}
210
161
211
/* Set GPGME home directory for the OpenPGP engine only */
212
rc = gpgme_get_engine_info(&engine_info);
213
if(rc != GPG_ERR_NO_ERROR){
162
/* Set GPGME home directory for the OpenPGP engine only */
163
rc = gpgme_get_engine_info (&engine_info);
164
if (rc != GPG_ERR_NO_ERROR){
214
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
215
166
gpgme_strsource(rc), gpgme_strerror(rc));
216
return false;
167
return -1;
217
168
}
218
169
while(engine_info != NULL){
219
170
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
220
171
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
221
engine_info->file_name, tempdir);
172
engine_info->file_name, homedir);
222
173
break;
223
174
}
224
175
engine_info = engine_info->next;
225
176
}
226
177
if(engine_info == NULL){
227
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
228
return false;
229
}
230
231
/* Create new GPGME "context" */
232
rc = gpgme_new(&(mc.ctx));
233
if(rc != GPG_ERR_NO_ERROR){
234
fprintf(stderr, "bad gpgme_new: %s: %s\n",
235
gpgme_strsource(rc), gpgme_strerror(rc));
236
return false;
237
}
238
239
if(not import_key(pubkey) or not import_key(seckey)){
240
return false;
241
}
242
243
return true;
244
}
245
246
/*
247
* Decrypt OpenPGP data.
248
* Returns -1 on error
249
*/
250
static ssize_t pgp_packet_decrypt(const char *cryptotext,
251
size_t crypto_size,
252
char **plaintext){
253
gpgme_data_t dh_crypto, dh_plain;
254
gpgme_error_t rc;
255
ssize_t ret;
256
size_t plaintext_capacity = 0;
257
ssize_t plaintext_length = 0;
258
259
if(debug){
260
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
179
return -1;
261
180
}
262
181
263
182
/* Create new GPGME data buffer from memory cryptotext */
264
183
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
265
184
0);
266
if(rc != GPG_ERR_NO_ERROR){
185
if (rc != GPG_ERR_NO_ERROR){
267
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
268
187
gpgme_strsource(rc), gpgme_strerror(rc));
269
188
return -1;
271
190
272
191
/* Create new empty GPGME data buffer for the plaintext */
273
192
rc = gpgme_data_new(&dh_plain);
274
if(rc != GPG_ERR_NO_ERROR){
193
if (rc != GPG_ERR_NO_ERROR){
275
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
276
195
gpgme_strsource(rc), gpgme_strerror(rc));
277
196
gpgme_data_release(dh_crypto);
278
197
return -1;
279
198
}
280
199
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
206
goto decrypt_end;
207
}
208
281
209
/* Decrypt data from the cryptotext data buffer to the plaintext
282
210
data buffer */
283
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
284
if(rc != GPG_ERR_NO_ERROR){
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
285
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
286
214
gpgme_strsource(rc), gpgme_strerror(rc));
287
215
plaintext_length = -1;
288
if(debug){
289
gpgme_decrypt_result_t result;
290
result = gpgme_op_decrypt_result(mc.ctx);
291
if(result == NULL){
292
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
293
} else {
294
fprintf(stderr, "Unsupported algorithm: %s\n",
295
result->unsupported_algorithm);
296
fprintf(stderr, "Wrong key usage: %u\n",
297
result->wrong_key_usage);
298
if(result->file_name != NULL){
299
fprintf(stderr, "File name: %s\n", result->file_name);
300
}
301
gpgme_recipient_t recipient;
302
recipient = result->recipients;
303
if(recipient){
304
while(recipient != NULL){
305
fprintf(stderr, "Public key algorithm: %s\n",
306
gpgme_pubkey_algo_name(recipient->pubkey_algo));
307
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
308
fprintf(stderr, "Secret key available: %s\n",
309
recipient->status == GPG_ERR_NO_SECKEY
310
? "No" : "Yes");
311
recipient = recipient->next;
312
}
313
}
314
}
315
}
316
216
goto decrypt_end;
317
217
}
318
218
320
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
321
221
}
322
222
223
if (debug){
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
226
if (result == NULL){
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
228
} else {
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
235
}
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
238
if(recipient){
239
while(recipient != NULL){
240
fprintf(stderr, "Public key algorithm: %s\n",
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
242
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
243
fprintf(stderr, "Secret key available: %s\n",
244
recipient->status == GPG_ERR_NO_SECKEY
245
? "No" : "Yes");
246
recipient = recipient->next;
247
}
248
}
249
}
250
}
251
323
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
324
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
325
perror("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
326
255
plaintext_length = -1;
327
256
goto decrypt_end;
328
257
}
329
258
330
259
*plaintext = NULL;
331
260
while(true){
332
plaintext_capacity = incbuffer(plaintext,
261
plaintext_capacity = adjustbuffer(plaintext,
333
262
(size_t)plaintext_length,
334
263
plaintext_capacity);
335
if(plaintext_capacity == 0){
336
perror("incbuffer");
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
337
266
plaintext_length = -1;
338
267
goto decrypt_end;
339
268
}
341
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
342
271
BUFFER_SIZE);
343
272
/* Print the data, if any */
344
if(ret == 0){
273
if (ret == 0){
345
274
/* EOF */
346
275
break;
347
276
}
352
281
}
353
282
plaintext_length += ret;
354
283
}
355
284
356
285
if(debug){
357
286
fprintf(stderr, "Decrypted password is: ");
358
287
for(ssize_t i = 0; i < plaintext_length; i++){
371
300
return plaintext_length;
372
301
}
373
302
374
static const char * safer_gnutls_strerror(int value){
375
const char *ret = gnutls_strerror(value); /* Spurious warning from
376
-Wunreachable-code */
377
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value);
305
if (ret == NULL)
378
306
ret = "(unknown)";
379
307
return ret;
380
308
}
385
313
fprintf(stderr, "GnuTLS: %s", string);
386
314
}
387
315
388
static int init_gnutls_global(const char *pubkeyfilename,
389
const char *seckeyfilename){
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
390
319
int ret;
391
320
392
321
if(debug){
394
323
}
395
324
396
325
ret = gnutls_global_init();
397
if(ret != GNUTLS_E_SUCCESS){
398
fprintf(stderr, "GnuTLS global_init: %s\n",
399
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
400
329
return -1;
401
330
}
402
331
403
if(debug){
332
if (debug){
404
333
/* "Use a log level over 10 to enable all debugging options."
405
334
* - GnuTLS manual
406
335
*/
409
338
}
410
339
411
340
/* OpenPGP credentials */
412
gnutls_certificate_allocate_credentials(&mc.cred);
413
if(ret != GNUTLS_E_SUCCESS){
414
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
415
from
416
-Wunreachable-code
417
*/
418
safer_gnutls_strerror(ret));
419
gnutls_global_deinit();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
420
346
return -1;
421
347
}
422
348
423
349
if(debug){
424
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
425
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
426
seckeyfilename);
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
427
353
}
428
354
429
355
ret = gnutls_certificate_set_openpgp_key_file
430
(mc.cred, pubkeyfilename, seckeyfilename,
431
GNUTLS_OPENPGP_FMT_BASE64);
432
if(ret != GNUTLS_E_SUCCESS){
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
433
358
fprintf(stderr,
434
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
435
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
436
fprintf(stderr, "The GnuTLS error is: %s\n",
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
437
362
safer_gnutls_strerror(ret));
438
363
goto globalfail;
439
364
}
440
365
441
366
/* GnuTLS server initialization */
442
ret = gnutls_dh_params_init(&mc.dh_params);
443
if(ret != GNUTLS_E_SUCCESS){
444
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
445
" %s\n", safer_gnutls_strerror(ret));
446
goto globalfail;
447
}
448
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
449
if(ret != GNUTLS_E_SUCCESS){
450
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
451
safer_gnutls_strerror(ret));
452
goto globalfail;
453
}
454
455
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
456
367
ret = gnutls_dh_params_init(&mc->dh_params);
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
371
goto globalfail;
372
}
373
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
377
goto globalfail;
378
}
379
380
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
381
457
382
return 0;
458
383
459
384
globalfail:
460
461
gnutls_certificate_free_credentials(mc.cred);
385
386
gnutls_certificate_free_credentials(mc->cred);
462
387
gnutls_global_deinit();
463
gnutls_dh_params_deinit(mc.dh_params);
464
388
return -1;
389
465
390
}
466
391
467
static int init_gnutls_session(gnutls_session_t *session){
392
static int init_gnutls_session(mandos_context *mc,
393
gnutls_session_t *session){
468
394
int ret;
469
395
/* GnuTLS session creation */
470
396
ret = gnutls_init(session, GNUTLS_SERVER);
471
if(ret != GNUTLS_E_SUCCESS){
397
if (ret != GNUTLS_E_SUCCESS){
472
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
473
399
safer_gnutls_strerror(ret));
474
400
}
475
401
476
402
{
477
403
const char *err;
478
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
479
if(ret != GNUTLS_E_SUCCESS){
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
480
406
fprintf(stderr, "Syntax error at: %s\n", err);
481
407
fprintf(stderr, "GnuTLS error: %s\n",
482
408
safer_gnutls_strerror(ret));
483
gnutls_deinit(*session);
409
gnutls_deinit (*session);
484
410
return -1;
485
411
}
486
412
}
487
413
488
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
489
mc.cred);
490
if(ret != GNUTLS_E_SUCCESS){
415
mc->cred);
416
if (ret != GNUTLS_E_SUCCESS) {
491
417
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
492
418
safer_gnutls_strerror(ret));
493
gnutls_deinit(*session);
419
gnutls_deinit (*session);
494
420
return -1;
495
421
}
496
422
497
423
/* ignore client certificate if any. */
498
gnutls_certificate_server_set_request(*session,
499
GNUTLS_CERT_IGNORE);
424
gnutls_certificate_server_set_request (*session,
425
GNUTLS_CERT_IGNORE);
500
426
501
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
502
428
503
429
return 0;
504
430
}
510
436
/* Called when a Mandos server is found */
511
437
static int start_mandos_communication(const char *ip, uint16_t port,
512
438
AvahiIfIndex if_index,
513
int af){
439
mandos_context *mc){
514
440
int ret, tcp_sd;
515
ssize_t sret;
516
union {
517
struct sockaddr_in in;
518
struct sockaddr_in6 in6;
519
} to;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
520
442
char *buffer = NULL;
521
443
char *decrypted_buffer;
522
444
size_t buffer_length = 0;
524
446
ssize_t decrypted_buffer_size;
525
447
size_t written;
526
448
int retval = 0;
449
char interface[IF_NAMESIZE];
527
450
gnutls_session_t session;
528
int pf; /* Protocol family */
529
530
switch(af){
531
case AF_INET6:
532
pf = PF_INET6;
533
break;
534
case AF_INET:
535
pf = PF_INET;
536
break;
537
default:
538
fprintf(stderr, "Bad address family: %d\n", af);
539
return -1;
540
}
541
542
ret = init_gnutls_session(&session);
543
if(ret != 0){
451
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
544
454
return -1;
545
455
}
546
456
547
457
if(debug){
548
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
549
"\n", ip, port);
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
459
ip, port);
550
460
}
551
461
552
tcp_sd = socket(pf, SOCK_STREAM, 0);
553
if(tcp_sd < 0){
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
463
if(tcp_sd < 0) {
554
464
perror("socket");
555
465
return -1;
556
466
}
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
perror("if_indextoname");
471
return -1;
472
}
473
fprintf(stderr, "Binding to interface %s\n", interface);
474
}
557
475
558
memset(&to, 0, sizeof(to));
559
if(af == AF_INET6){
560
to.in6.sin6_family = (uint16_t)af;
561
ret = inet_pton(af, ip, &to.in6.sin6_addr);
562
} else { /* IPv4 */
563
to.in.sin_family = (sa_family_t)af;
564
ret = inet_pton(af, ip, &to.in.sin_addr);
565
}
566
if(ret < 0 ){
476
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
481
if (ret < 0 ){
567
482
perror("inet_pton");
568
483
return -1;
569
484
}
571
486
fprintf(stderr, "Bad address: %s\n", ip);
572
487
return -1;
573
488
}
574
if(af == AF_INET6){
575
to.in6.sin6_port = htons(port); /* Spurious warnings from
576
-Wconversion and
577
-Wunreachable-code */
578
579
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
580
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
581
-Wunreachable-code*/
582
if(if_index == AVAHI_IF_UNSPEC){
583
fprintf(stderr, "An IPv6 link-local address is incomplete"
584
" without a network interface\n");
585
return -1;
586
}
587
/* Set the network interface number as scope */
588
to.in6.sin6_scope_id = (uint32_t)if_index;
589
}
590
} else {
591
to.in.sin_port = htons(port); /* Spurious warnings from
592
-Wconversion and
593
-Wunreachable-code */
594
}
489
to.in6.sin6_port = htons(port); /* Spurious warning */
490
491
to.in6.sin6_scope_id = (uint32_t)if_index;
595
492
596
493
if(debug){
597
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
598
char interface[IF_NAMESIZE];
599
if(if_indextoname((unsigned int)if_index, interface) == NULL){
600
perror("if_indextoname");
601
} else {
602
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
603
ip, interface, port);
604
}
605
} else {
606
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
607
port);
608
}
609
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
610
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
611
const char *pcret;
612
if(af == AF_INET6){
613
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
614
sizeof(addrstr));
615
} else {
616
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
617
sizeof(addrstr));
618
}
619
if(pcret == NULL){
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
620
498
perror("inet_ntop");
621
499
} else {
622
500
if(strcmp(addrstr, ip) != 0){
625
503
}
626
504
}
627
505
628
if(af == AF_INET6){
629
ret = connect(tcp_sd, &to.in6, sizeof(to));
630
} else {
631
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
632
}
633
if(ret < 0){
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
634
508
perror("connect");
635
509
return -1;
636
510
}
637
511
638
512
const char *out = mandos_protocol_version;
639
513
written = 0;
640
while(true){
514
while (true){
641
515
size_t out_size = strlen(out);
642
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
643
517
out_size - written));
644
if(ret == -1){
518
if (ret == -1){
645
519
perror("write");
646
520
retval = -1;
647
521
goto mandos_end;
650
524
if(written < out_size){
651
525
continue;
652
526
} else {
653
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
654
528
written = 0;
655
529
out = "\r\n";
656
530
} else {
658
532
}
659
533
}
660
534
}
661
535
662
536
if(debug){
663
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
664
538
}
665
539
666
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
667
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
668
542
do{
669
ret = gnutls_handshake(session);
543
ret = gnutls_handshake (session);
670
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
671
545
672
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
673
547
if(debug){
674
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
675
gnutls_perror(ret);
549
gnutls_perror (ret);
676
550
}
677
551
retval = -1;
678
552
goto mandos_end;
681
555
/* Read OpenPGP packet that contains the wanted password */
682
556
683
557
if(debug){
684
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
685
559
ip);
686
560
}
687
561
688
562
while(true){
689
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
690
564
buffer_capacity);
691
if(buffer_capacity == 0){
692
perror("incbuffer");
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
693
567
retval = -1;
694
568
goto mandos_end;
695
569
}
696
570
697
sret = gnutls_record_recv(session, buffer+buffer_length,
698
BUFFER_SIZE);
699
if(sret == 0){
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
700
574
break;
701
575
}
702
if(sret < 0){
703
switch(sret){
576
if (ret < 0){
577
switch(ret){
704
578
case GNUTLS_E_INTERRUPTED:
705
579
case GNUTLS_E_AGAIN:
706
580
break;
707
581
case GNUTLS_E_REHANDSHAKE:
708
582
do{
709
ret = gnutls_handshake(session);
583
ret = gnutls_handshake (session);
710
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
711
if(ret < 0){
585
if (ret < 0){
712
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
713
gnutls_perror(ret);
587
gnutls_perror (ret);
714
588
retval = -1;
715
589
goto mandos_end;
716
590
}
719
593
fprintf(stderr, "Unknown error while reading data from"
720
594
" encrypted session with Mandos server\n");
721
595
retval = -1;
722
gnutls_bye(session, GNUTLS_SHUT_RDWR);
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
723
597
goto mandos_end;
724
598
}
725
599
} else {
726
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
727
601
}
728
602
}
729
603
731
605
fprintf(stderr, "Closing TLS session\n");
732
606
}
733
607
734
gnutls_bye(session, GNUTLS_SHUT_RDWR);
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
735
609
736
if(buffer_length > 0){
610
if (buffer_length > 0){
737
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
738
612
buffer_length,
739
&decrypted_buffer);
740
if(decrypted_buffer_size >= 0){
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
741
616
written = 0;
742
617
while(written < (size_t) decrypted_buffer_size){
743
ret = (int)fwrite(decrypted_buffer + written, 1,
744
(size_t)decrypted_buffer_size - written,
745
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
746
621
if(ret == 0 and ferror(stdout)){
747
622
if(debug){
748
623
fprintf(stderr, "Error writing encrypted data: %s\n",
757
632
} else {
758
633
retval = -1;
759
634
}
760
} else {
761
retval = -1;
762
635
}
763
636
764
637
/* Shutdown procedure */
765
638
766
639
mandos_end:
767
640
free(buffer);
768
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
769
if(ret == -1){
770
perror("close");
771
}
772
gnutls_deinit(session);
641
close(tcp_sd);
642
gnutls_deinit (session);
773
643
return retval;
774
644
}
775
645
776
646
static void resolve_callback(AvahiSServiceResolver *r,
777
647
AvahiIfIndex interface,
778
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
779
649
AvahiResolverEvent event,
780
650
const char *name,
781
651
const char *type,
786
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
787
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
788
658
flags,
789
__attribute__((unused)) void* userdata){
790
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
791
662
792
663
/* Called whenever a service has been resolved successfully or
793
664
timed out */
794
665
795
switch(event){
666
switch (event) {
796
667
default:
797
668
case AVAHI_RESOLVER_FAILURE:
798
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
801
672
break;
802
673
803
674
case AVAHI_RESOLVER_FOUND:
805
676
char ip[AVAHI_ADDRESS_STR_MAX];
806
677
avahi_address_snprint(ip, sizeof(ip), address);
807
678
if(debug){
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
811
681
}
812
int ret = start_mandos_communication(ip, port, interface,
813
avahi_proto_to_af(proto));
814
if(ret == 0){
815
avahi_simple_poll_quit(mc.simple_poll);
682
int ret = start_mandos_communication(ip, port, interface, mc);
683
if (ret == 0){
684
exit(EXIT_SUCCESS);
816
685
}
817
686
}
818
687
}
819
688
avahi_s_service_resolver_free(r);
820
689
}
821
690
822
static void browse_callback(AvahiSServiceBrowser *b,
823
AvahiIfIndex interface,
824
AvahiProtocol protocol,
825
AvahiBrowserEvent event,
826
const char *name,
827
const char *type,
828
const char *domain,
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
flags,
831
__attribute__((unused)) void* userdata){
832
assert(b);
691
static void browse_callback( AvahiSServiceBrowser *b,
692
AvahiIfIndex interface,
693
AvahiProtocol protocol,
694
AvahiBrowserEvent event,
695
const char *name,
696
const char *type,
697
const char *domain,
698
AVAHI_GCC_UNUSED AvahiLookupResultFlags
699
flags,
700
void* userdata) {
701
mandos_context *mc = userdata;
702
assert(b); /* Spurious warning */
833
703
834
704
/* Called whenever a new services becomes available on the LAN or
835
705
is removed from the LAN */
836
706
837
switch(event){
707
switch (event) {
838
708
default:
839
709
case AVAHI_BROWSER_FAILURE:
840
710
841
711
fprintf(stderr, "(Avahi browser) %s\n",
842
avahi_strerror(avahi_server_errno(mc.server)));
843
avahi_simple_poll_quit(mc.simple_poll);
712
avahi_strerror(avahi_server_errno(mc->server)));
713
avahi_simple_poll_quit(mc->simple_poll);
844
714
return;
845
715
846
716
case AVAHI_BROWSER_NEW:
849
719
the callback function is called the Avahi server will free the
850
720
resolver for us. */
851
721
852
if(!(avahi_s_service_resolver_new(mc.server, interface,
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
853
723
protocol, name, type, domain,
854
724
AVAHI_PROTO_INET6, 0,
855
resolve_callback, NULL)))
725
resolve_callback, mc)))
856
726
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
857
name, avahi_strerror(avahi_server_errno(mc.server)));
727
name, avahi_strerror(avahi_server_errno(mc->server)));
858
728
break;
859
729
860
730
case AVAHI_BROWSER_REMOVE:
869
739
}
870
740
}
871
741
872
static void handle_sigterm(__attribute__((unused)) int sig){
873
int old_errno = errno;
874
avahi_simple_poll_quit(mc.simple_poll);
875
errno = old_errno;
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
748
if (tmp == NULL){
749
return NULL;
750
}
751
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
753
}
754
tmp[f_len] = '/';
755
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
757
}
758
tmp[f_len + 1 + s_len] = '\0';
759
return tmp;
876
760
}
877
761
762
878
763
int main(int argc, char *argv[]){
879
AvahiSServiceBrowser *sb = NULL;
880
int error;
881
int ret;
882
intmax_t tmpmax;
883
int numchars;
884
int exitcode = EXIT_SUCCESS;
885
const char *interface = "eth0";
886
struct ifreq network;
887
int sd;
888
uid_t uid;
889
gid_t gid;
890
char *connect_to = NULL;
891
char tempdir[] = "/tmp/mandosXXXXXX";
892
bool tempdir_created = false;
893
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
894
const char *seckey = PATHDIR "/" SECKEY;
895
const char *pubkey = PATHDIR "/" PUBKEY;
896
897
bool gnutls_initialized = false;
898
bool gpgme_initialized = false;
899
double delay = 2.5;
900
901
struct sigaction old_sigterm_action;
902
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
903
904
/* Initialize mandos context */
905
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
906
.dh_bits = 1024, .priority = "SECURE256"
907
":!CTYPE-X.509:+CTYPE-OPENPGP" };
908
909
{
910
struct argp_option options[] = {
911
{ .name = "debug", .key = 128,
912
.doc = "Debug mode", .group = 3 },
913
{ .name = "connect", .key = 'c',
914
.arg = "ADDRESS:PORT",
915
.doc = "Connect directly to a specific Mandos server",
916
.group = 1 },
917
{ .name = "interface", .key = 'i',
918
.arg = "NAME",
919
.doc = "Network interface that will be used to search for"
920
" Mandos servers",
921
.group = 1 },
922
{ .name = "seckey", .key = 's',
923
.arg = "FILE",
924
.doc = "OpenPGP secret key file base name",
925
.group = 1 },
926
{ .name = "pubkey", .key = 'p',
927
.arg = "FILE",
928
.doc = "OpenPGP public key file base name",
929
.group = 2 },
930
{ .name = "dh-bits", .key = 129,
931
.arg = "BITS",
932
.doc = "Bit length of the prime number used in the"
933
" Diffie-Hellman key exchange",
934
.group = 2 },
935
{ .name = "priority", .key = 130,
936
.arg = "STRING",
937
.doc = "GnuTLS priority string for the TLS handshake",
938
.group = 1 },
939
{ .name = "delay", .key = 131,
940
.arg = "SECONDS",
941
.doc = "Maximum delay to wait for interface startup",
942
.group = 2 },
943
{ .name = NULL }
944
};
945
946
error_t parse_opt(int key, char *arg,
947
struct argp_state *state){
948
switch(key){
949
case 128: /* --debug */
950
debug = true;
951
break;
952
case 'c': /* --connect */
953
connect_to = arg;
954
break;
955
case 'i': /* --interface */
956
interface = arg;
957
break;
958
case 's': /* --seckey */
959
seckey = arg;
960
break;
961
case 'p': /* --pubkey */
962
pubkey = arg;
963
break;
964
case 129: /* --dh-bits */
965
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
966
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
967
or arg[numchars] != '\0'){
968
fprintf(stderr, "Bad number of DH bits\n");
969
exit(EXIT_FAILURE);
970
}
971
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
972
break;
973
case 130: /* --priority */
974
mc.priority = arg;
975
break;
976
case 131: /* --delay */
977
ret = sscanf(arg, "%lf%n", &delay, &numchars);
978
if(ret < 1 or arg[numchars] != '\0'){
979
fprintf(stderr, "Bad delay\n");
980
exit(EXIT_FAILURE);
981
}
982
break;
983
case ARGP_KEY_ARG:
984
argp_usage(state);
985
case ARGP_KEY_END:
986
break;
987
default:
988
return ARGP_ERR_UNKNOWN;
989
}
990
return 0;
991
}
992
993
struct argp argp = { .options = options, .parser = parse_opt,
994
.args_doc = "",
995
.doc = "Mandos client -- Get and decrypt"
996
" passwords from a Mandos server" };
997
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
998
if(ret == ARGP_ERR_UNKNOWN){
999
fprintf(stderr, "Unknown error while parsing arguments\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1003
}
1004
1005
/* If the interface is down, bring it up */
1006
if(interface[0] != '\0'){
1007
#ifdef __linux__
1008
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1009
messages to mess up the prompt */
1010
ret = klogctl(8, NULL, 5);
1011
bool restore_loglevel = true;
1012
if(ret == -1){
1013
restore_loglevel = false;
1014
perror("klogctl");
1015
}
1016
#endif
1017
1018
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1019
if(sd < 0){
1020
perror("socket");
1021
exitcode = EXIT_FAILURE;
1022
#ifdef __linux__
1023
if(restore_loglevel){
1024
ret = klogctl(7, NULL, 0);
1025
if(ret == -1){
1026
perror("klogctl");
1027
}
1028
}
1029
#endif
1030
goto end;
1031
}
1032
strcpy(network.ifr_name, interface);
1033
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1034
if(ret == -1){
1035
perror("ioctl SIOCGIFFLAGS");
1036
#ifdef __linux__
1037
if(restore_loglevel){
1038
ret = klogctl(7, NULL, 0);
1039
if(ret == -1){
1040
perror("klogctl");
1041
}
1042
}
1043
#endif
1044
exitcode = EXIT_FAILURE;
1045
goto end;
1046
}
1047
if((network.ifr_flags & IFF_UP) == 0){
1048
network.ifr_flags |= IFF_UP;
1049
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1050
if(ret == -1){
1051
perror("ioctl SIOCSIFFLAGS");
764
AvahiSServiceBrowser *sb = NULL;
765
int error;
766
int ret;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
770
int sd;
771
uid_t uid;
772
gid_t gid;
773
char *connect_to = NULL;
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
780
781
{
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
788
.group = 1 },
789
{ .name = "interface", .key = 'i',
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "dh-bits to use in gnutls communication",
808
.group = 2 },
809
{ .name = "priority", .key = 130,
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
812
{ .name = NULL }
813
};
814
815
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128:
822
debug = true;
823
break;
824
case 'c':
825
connect_to = arg;
826
break;
827
case 'i':
828
interface = arg;
829
break;
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyfile = arg;
835
break;
836
case 'p':
837
pubkeyfile = arg;
838
break;
839
case 129:
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
844
exit(EXIT_FAILURE);
845
}
846
break;
847
case 130:
848
mc.priority = arg;
849
break;
850
case ARGP_KEY_ARG:
851
argp_usage (state);
852
break;
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
859
}
860
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
1052
868
exitcode = EXIT_FAILURE;
1053
#ifdef __linux__
1054
if(restore_loglevel){
1055
ret = klogctl(7, NULL, 0);
1056
if(ret == -1){
1057
perror("klogctl");
1058
}
1059
}
1060
#endif
1061
869
goto end;
1062
870
}
1063
871
}
1064
/* sleep checking until interface is running */
1065
for(int i=0; i < delay * 4; i++){
1066
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1067
if(ret == -1){
1068
perror("ioctl SIOCGIFFLAGS");
1069
} else if(network.ifr_flags & IFF_RUNNING){
1070
break;
1071
}
1072
struct timespec sleeptime = { .tv_nsec = 250000000 };
1073
ret = nanosleep(&sleeptime, NULL);
1074
if(ret == -1 and errno != EINTR){
1075
perror("nanosleep");
1076
}
1077
}
1078
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1079
if(ret == -1){
1080
perror("close");
1081
}
1082
#ifdef __linux__
1083
if(restore_loglevel){
1084
/* Restores kernel loglevel to default */
1085
ret = klogctl(7, NULL, 0);
1086
if(ret == -1){
1087
perror("klogctl");
1088
}
1089
}
1090
#endif
1091
}
1092
1093
uid = getuid();
1094
gid = getgid();
1095
1096
errno = 0;
1097
setgid(gid);
1098
if(ret == -1){
1099
perror("setgid");
1100
}
1101
1102
ret = setuid(uid);
1103
if(ret == -1){
1104
perror("setuid");
1105
}
1106
1107
ret = init_gnutls_global(pubkey, seckey);
1108
if(ret == -1){
1109
fprintf(stderr, "init_gnutls_global failed\n");
1110
exitcode = EXIT_FAILURE;
1111
goto end;
1112
} else {
1113
gnutls_initialized = true;
1114
}
1115
1116
if(mkdtemp(tempdir) == NULL){
1117
perror("mkdtemp");
1118
goto end;
1119
}
1120
tempdir_created = true;
1121
1122
if(not init_gpgme(pubkey, seckey, tempdir)){
1123
fprintf(stderr, "init_gpgme failed\n");
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
} else {
1127
gpgme_initialized = true;
1128
}
1129
1130
if(interface[0] != '\0'){
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global\n");
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
uid = getuid();
895
gid = getgid();
896
897
ret = setuid(uid);
898
if (ret == -1){
899
perror("setuid");
900
}
901
902
setgid(gid);
903
if (ret == -1){
904
perror("setgid");
905
}
906
1131
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
1132
908
if(if_index == 0){
1133
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
}
1137
}
1138
1139
if(connect_to != NULL){
1140
/* Connect directly, do not use Zeroconf */
1141
/* (Mainly meant for debugging) */
1142
char *address = strrchr(connect_to, ':');
1143
if(address == NULL){
1144
fprintf(stderr, "No colon in address\n");
1145
exitcode = EXIT_FAILURE;
1146
goto end;
1147
}
1148
uint16_t port;
1149
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1150
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1151
or address[numchars+1] != '\0'){
1152
fprintf(stderr, "Bad port number\n");
1153
exitcode = EXIT_FAILURE;
1154
goto end;
1155
}
1156
port = (uint16_t)tmpmax;
1157
*address = '\0';
1158
address = connect_to;
1159
/* Colon in address indicates IPv6 */
1160
int af;
1161
if(strchr(address, ':') != NULL){
1162
af = AF_INET6;
1163
} else {
1164
af = AF_INET;
1165
}
1166
ret = start_mandos_communication(address, port, if_index,
1167
af);
1168
if(ret < 0){
1169
exitcode = EXIT_FAILURE;
1170
} else {
1171
exitcode = EXIT_SUCCESS;
1172
}
1173
goto end;
1174
}
1175
1176
if(not debug){
1177
avahi_set_log_function(empty_log);
1178
}
1179
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1182
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;
1188
goto end;
1189
}
1190
1191
{
1192
AvahiServerConfig config;
1193
/* Do not publish any local Zeroconf records */
1194
avahi_server_config_init(&config);
1195
config.publish_hinfo = 0;
1196
config.publish_addresses = 0;
1197
config.publish_workstation = 0;
1198
config.publish_domain = 0;
1199
1200
/* Allocate a new server */
1201
mc.server = avahi_server_new(avahi_simple_poll_get
1202
(mc.simple_poll), &config, NULL,
1203
NULL, &error);
1204
1205
/* Free the Avahi configuration data */
1206
avahi_server_config_free(&config);
1207
}
1208
1209
/* Check if creating the Avahi server object succeeded */
1210
if(mc.server == NULL){
1211
fprintf(stderr, "Failed to create Avahi server: %s\n",
1212
avahi_strerror(error));
1213
exitcode = EXIT_FAILURE;
1214
goto end;
1215
}
1216
1217
/* Create the Avahi service browser */
1218
sb = avahi_s_service_browser_new(mc.server, if_index,
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
1220
NULL, 0, browse_callback, NULL);
1221
if(sb == NULL){
1222
fprintf(stderr, "Failed to create service browser: %s\n",
1223
avahi_strerror(avahi_server_errno(mc.server)));
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
1228
sigemptyset(&sigterm_action.sa_mask);
1229
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1230
if(ret == -1){
1231
perror("sigaddset");
1232
exitcode = EXIT_FAILURE;
1233
goto end;
1234
}
1235
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1236
if(ret == -1){
1237
perror("sigaction");
1238
exitcode = EXIT_FAILURE;
1239
goto end;
1240
}
1241
1242
/* Run the main loop */
1243
1244
if(debug){
1245
fprintf(stderr, "Starting Avahi loop search\n");
1246
}
1247
1248
avahi_simple_poll_loop(mc.simple_poll);
1249
910
exit(EXIT_FAILURE);
911
}
912
913
if(connect_to != NULL){
914
/* Connect directly, do not use Zeroconf */
915
/* (Mainly meant for debugging) */
916
char *address = strrchr(connect_to, ':');
917
if(address == NULL){
918
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
920
goto end;
921
}
922
errno = 0;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
924
if(errno){
925
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
*address = '\0';
930
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
932
if(ret < 0){
933
exitcode = EXIT_FAILURE;
934
} else {
935
exitcode = EXIT_SUCCESS;
936
}
937
goto end;
938
}
939
940
/* If the interface is down, bring it up */
941
{
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
943
if(sd < 0) {
944
perror("socket");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
950
if(ret == -1){
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
958
if(ret == -1){
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
}
964
close(sd);
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
1250
1029
end:
1251
1252
if(debug){
1253
fprintf(stderr, "%s exiting\n", argv[0]);
1254
}
1255
1256
/* Cleanup things */
1257
if(sb != NULL)
1258
avahi_s_service_browser_free(sb);
1259
1260
if(mc.server != NULL)
1261
avahi_server_free(mc.server);
1262
1263
if(mc.simple_poll != NULL)
1264
avahi_simple_poll_free(mc.simple_poll);
1265
1266
if(gnutls_initialized){
1267
gnutls_certificate_free_credentials(mc.cred);
1268
gnutls_global_deinit();
1269
gnutls_dh_params_deinit(mc.dh_params);
1270
}
1271
1272
if(gpgme_initialized){
1273
gpgme_release(mc.ctx);
1274
}
1275
1276
/* Removes the temp directory used by GPGME */
1277
if(tempdir_created){
1278
DIR *d;
1279
struct dirent *direntry;
1280
d = opendir(tempdir);
1281
if(d == NULL){
1282
if(errno != ENOENT){
1283
perror("opendir");
1284
}
1285
} else {
1286
while(true){
1287
direntry = readdir(d);
1288
if(direntry == NULL){
1289
break;
1290
}
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
1296
continue;
1297
}
1298
char *fullname = NULL;
1299
ret = asprintf(&fullname, "%s/%s", tempdir,
1300
direntry->d_name);
1301
if(ret < 0){
1302
perror("asprintf");
1303
continue;
1304
}
1305
ret = remove(fullname);
1306
if(ret == -1){
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1308
strerror(errno));
1309
}
1310
free(fullname);
1311
}
1312
closedir(d);
1313
}
1314
ret = rmdir(tempdir);
1315
if(ret == -1 and errno != ENOENT){
1316
perror("rmdir");
1317
}
1318
}
1319
1320
return exitcode;
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfile);
1045
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
1321
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0