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» Revision
24.1.51
(compared to revision 237.2.129)
: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:17:32 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815201732-b7uux3yqs05b3fy9
Added configuration files support for mandos-client
Removed plus argument support for mandos-client
Removed plus argument support for mandos-client
- 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
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
56
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
57
#include <time.h> /* time() */
67
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
59
SIOCSIFFLAGS, if_indextoname(),
69
60
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
62
getuid(), getgid(), setuid(),
75
63
setgid() */
64
#include <netinet/in.h>
76
65
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
66
#include <iso646.h> /* not, and */
78
67
#include <argp.h> /* struct argp_option, error_t, struct
79
68
argp_state, struct argp,
80
69
argp_parse(), ARGP_KEY_ARG,
81
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
71
90
72
/* Avahi */
91
73
/* All Avahi types, constants and functions
99
81
#include <avahi-common/error.h>
100
82
101
83
/* GnuTLS */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
104
85
gnutls_*
105
86
init_gnutls_session(),
106
87
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
89
GNUTLS_OPENPGP_FMT_BASE64 */
110
90
111
91
/* GPGME */
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
114
93
gpgme_*
115
94
GPGME_PROTOCOL_OpenPGP,
116
95
GPG_ERR_NO_* */
117
96
118
97
#define BUFFER_SIZE 256
119
98
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
125
101
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
102
const char *argp_program_version = "password-request 1.0";
127
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
104
129
105
/* Used for passing in values through the Avahi callback functions */
134
110
unsigned int dh_bits;
135
111
gnutls_dh_params_t dh_params;
136
112
const char *priority;
137
gpgme_ctx_t ctx;
138
113
} mandos_context;
139
114
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
115
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
148
118
* "buffer_length" is how much is already used.
149
119
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
121
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
124
if (buffer == NULL){
155
125
return 0;
156
126
}
157
127
buffer_capacity += BUFFER_SIZE;
160
130
}
161
131
162
132
/*
163
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
164
135
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
167
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
168
146
gpgme_engine_info_t engine_info;
169
147
170
171
/*
172
* Helper function to insert pub and seckey to the engine keyring.
173
*/
174
bool import_key(const char *filename){
175
int ret;
176
int fd;
177
gpgme_data_t pgp_data;
178
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
if(fd == -1){
181
perror("open");
182
return false;
183
}
184
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
if(ret == -1){
201
perror("close");
202
}
203
gpgme_data_release(pgp_data);
204
return true;
205
}
206
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
150
}
210
151
211
152
/* Init GPGME */
212
153
gpgme_check_version(NULL);
213
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
155
if (rc != GPG_ERR_NO_ERROR){
215
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
157
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
158
return -1;
218
159
}
219
160
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
161
/* Set GPGME home directory for the OpenPGP engine only */
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
223
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
165
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
166
return -1;
226
167
}
227
168
while(engine_info != NULL){
228
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
231
172
break;
232
173
}
233
174
engine_info = engine_info->next;
234
175
}
235
176
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
270
179
}
271
180
272
181
/* Create new GPGME data buffer from memory cryptotext */
273
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
183
0);
275
if(rc != GPG_ERR_NO_ERROR){
184
if (rc != GPG_ERR_NO_ERROR){
276
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
186
gpgme_strsource(rc), gpgme_strerror(rc));
278
187
return -1;
280
189
281
190
/* Create new empty GPGME data buffer for the plaintext */
282
191
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
192
if (rc != GPG_ERR_NO_ERROR){
284
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
194
gpgme_strsource(rc), gpgme_strerror(rc));
286
195
gpgme_data_release(dh_crypto);
287
196
return -1;
288
197
}
289
198
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
290
208
/* Decrypt data from the cryptotext data buffer to the plaintext
291
209
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
294
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
213
gpgme_strsource(rc), gpgme_strerror(rc));
296
214
plaintext_length = -1;
297
if(debug){
298
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
307
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
309
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
215
goto decrypt_end;
216
}
217
218
if(debug){
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
}
221
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
if(recipient){
312
238
while(recipient != NULL){
313
239
fprintf(stderr, "Public key algorithm: %s\n",
314
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
246
}
321
247
}
322
248
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
249
}
329
250
330
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
333
254
plaintext_length = -1;
334
255
goto decrypt_end;
335
256
}
336
257
337
258
*plaintext = NULL;
338
259
while(true){
339
plaintext_capacity = incbuffer(plaintext,
260
plaintext_capacity = adjustbuffer(plaintext,
340
261
(size_t)plaintext_length,
341
262
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
344
265
plaintext_length = -1;
345
266
goto decrypt_end;
346
267
}
348
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
270
BUFFER_SIZE);
350
271
/* Print the data, if any */
351
if(ret == 0){
272
if (ret == 0){
352
273
/* EOF */
353
274
break;
354
275
}
359
280
}
360
281
plaintext_length += ret;
361
282
}
362
283
363
284
if(debug){
364
285
fprintf(stderr, "Decrypted password is: ");
365
286
for(ssize_t i = 0; i < plaintext_length; i++){
378
299
return plaintext_length;
379
300
}
380
301
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
385
305
ret = "(unknown)";
386
306
return ret;
387
307
}
392
312
fprintf(stderr, "GnuTLS: %s", string);
393
313
}
394
314
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
397
318
int ret;
398
319
399
320
if(debug){
401
322
}
402
323
403
324
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
407
328
return -1;
408
329
}
409
330
410
if(debug){
331
if (debug){
411
332
/* "Use a log level over 10 to enable all debugging options."
412
333
* - GnuTLS manual
413
334
*/
416
337
}
417
338
418
339
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
340
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
427
345
return -1;
428
346
}
429
347
430
348
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
434
352
}
435
353
436
354
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
438
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
440
357
fprintf(stderr,
441
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
444
361
safer_gnutls_strerror(ret));
445
362
goto globalfail;
446
363
}
447
364
448
365
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
463
366
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
370
goto globalfail;
371
}
372
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
376
goto globalfail;
377
}
378
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
464
381
return 0;
465
382
466
383
globalfail:
467
468
gnutls_certificate_free_credentials(mc.cred);
384
385
gnutls_certificate_free_credentials(mc->cred);
469
386
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
387
return -1;
388
472
389
}
473
390
474
static int init_gnutls_session(gnutls_session_t *session){
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
475
393
int ret;
476
394
/* GnuTLS session creation */
477
395
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
396
if (ret != GNUTLS_E_SUCCESS){
479
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
398
safer_gnutls_strerror(ret));
481
399
}
482
400
483
401
{
484
402
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
487
405
fprintf(stderr, "Syntax error at: %s\n", err);
488
406
fprintf(stderr, "GnuTLS error: %s\n",
489
407
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
408
gnutls_deinit (*session);
491
409
return -1;
492
410
}
493
411
}
494
412
495
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
498
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
417
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
418
gnutls_deinit (*session);
501
419
return -1;
502
420
}
503
421
504
422
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
507
425
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
427
510
428
return 0;
511
429
}
514
432
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
433
__attribute__((unused)) const char *txt){}
516
434
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
435
/* Called when a Mandos server is found */
521
436
static int start_mandos_communication(const char *ip, uint16_t port,
522
437
AvahiIfIndex if_index,
523
int af){
524
int ret, tcp_sd = -1;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
438
mandos_context *mc){
439
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
530
441
char *buffer = NULL;
531
442
char *decrypted_buffer;
532
443
size_t buffer_length = 0;
533
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
534
446
size_t written;
535
447
int retval = 0;
448
char interface[IF_NAMESIZE];
536
449
gnutls_session_t session;
537
int pf; /* Protocol family */
538
539
if(quit_now){
540
return -1;
541
}
542
543
switch(af){
544
case AF_INET6:
545
pf = PF_INET6;
546
break;
547
case AF_INET:
548
pf = PF_INET;
549
break;
550
default:
551
fprintf(stderr, "Bad address family: %d\n", af);
552
return -1;
553
}
554
555
ret = init_gnutls_session(&session);
556
if(ret != 0){
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
557
453
return -1;
558
454
}
559
455
560
456
if(debug){
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
562
458
"\n", ip, port);
563
459
}
564
460
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
566
if(tcp_sd < 0){
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
567
463
perror("socket");
568
retval = -1;
569
goto mandos_end;
570
}
571
572
if(quit_now){
573
goto mandos_end;
574
}
575
576
memset(&to, 0, sizeof(to));
577
if(af == AF_INET6){
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
580
} else { /* IPv4 */
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
583
}
584
if(ret < 0 ){
464
return -1;
465
}
466
467
if(debug){
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
perror("if_indextoname");
470
return -1;
471
}
472
fprintf(stderr, "Binding to interface %s\n", interface);
473
}
474
475
memset(&to,0,sizeof(to)); /* Spurious warning */
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
if (ret < 0 ){
585
481
perror("inet_pton");
586
retval = -1;
587
goto mandos_end;
482
return -1;
588
483
}
589
484
if(ret == 0){
590
485
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
592
goto mandos_end;
593
}
594
if(af == AF_INET6){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
602
if(if_index == AVAHI_IF_UNSPEC){
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
606
goto mandos_end;
607
}
608
/* Set the network interface number as scope */
609
to.in6.sin6_scope_id = (uint32_t)if_index;
610
}
611
} else {
612
to.in.sin_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
615
}
486
return -1;
487
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
616
489
617
if(quit_now){
618
goto mandos_end;
619
}
490
to.in6.sin6_scope_id = (uint32_t)if_index;
620
491
621
492
if(debug){
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
623
char interface[IF_NAMESIZE];
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
625
perror("if_indextoname");
626
} else {
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
629
}
630
} else {
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
633
}
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
636
const char *pcret;
637
if(af == AF_INET6){
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
639
sizeof(addrstr));
640
} else {
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
642
sizeof(addrstr));
643
}
644
if(pcret == NULL){
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
645
498
perror("inet_ntop");
646
499
} else {
647
500
if(strcmp(addrstr, ip) != 0){
650
503
}
651
504
}
652
505
653
if(quit_now){
654
goto mandos_end;
655
}
656
657
if(af == AF_INET6){
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
659
} else {
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
}
662
if(ret < 0){
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
663
508
perror("connect");
664
retval = -1;
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
670
}
671
509
return -1;
510
}
511
672
512
const char *out = mandos_protocol_version;
673
513
written = 0;
674
while(true){
514
while (true){
675
515
size_t out_size = strlen(out);
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
677
517
out_size - written));
678
if(ret == -1){
518
if (ret == -1){
679
519
perror("write");
680
520
retval = -1;
681
521
goto mandos_end;
684
524
if(written < out_size){
685
525
continue;
686
526
} else {
687
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
688
528
written = 0;
689
529
out = "\r\n";
690
530
} else {
691
531
break;
692
532
}
693
533
}
694
695
if(quit_now){
696
goto mandos_end;
697
}
698
534
}
699
535
700
536
if(debug){
701
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
702
538
}
703
539
704
if(quit_now){
705
goto mandos_end;
706
}
707
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
709
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do {
715
ret = gnutls_handshake(session);
716
if(quit_now){
717
goto mandos_end;
718
}
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
719
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
545
721
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
722
547
if(debug){
723
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
724
gnutls_perror(ret);
549
gnutls_perror (ret);
725
550
}
726
551
retval = -1;
727
552
goto mandos_end;
730
555
/* Read OpenPGP packet that contains the wanted password */
731
556
732
557
if(debug){
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
734
559
ip);
735
560
}
736
561
737
562
while(true){
738
739
if(quit_now){
740
goto mandos_end;
741
}
742
743
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
744
564
buffer_capacity);
745
if(buffer_capacity == 0){
746
perror("incbuffer");
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
747
567
retval = -1;
748
568
goto mandos_end;
749
569
}
750
570
751
if(quit_now){
752
goto mandos_end;
753
}
754
755
sret = gnutls_record_recv(session, buffer+buffer_length,
756
BUFFER_SIZE);
757
if(sret == 0){
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
758
574
break;
759
575
}
760
if(sret < 0){
761
switch(sret){
576
if (ret < 0){
577
switch(ret){
762
578
case GNUTLS_E_INTERRUPTED:
763
579
case GNUTLS_E_AGAIN:
764
580
break;
765
581
case GNUTLS_E_REHANDSHAKE:
766
do {
767
ret = gnutls_handshake(session);
768
769
if(quit_now){
770
goto mandos_end;
771
}
582
do{
583
ret = gnutls_handshake (session);
772
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
773
if(ret < 0){
585
if (ret < 0){
774
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
775
gnutls_perror(ret);
587
gnutls_perror (ret);
776
588
retval = -1;
777
589
goto mandos_end;
778
590
}
781
593
fprintf(stderr, "Unknown error while reading data from"
782
594
" encrypted session with Mandos server\n");
783
595
retval = -1;
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
785
597
goto mandos_end;
786
598
}
787
599
} else {
788
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
789
601
}
790
602
}
791
603
793
605
fprintf(stderr, "Closing TLS session\n");
794
606
}
795
607
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
805
806
if(buffer_length > 0){
807
ssize_t decrypted_buffer_size;
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
808
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
612
buffer_length,
810
&decrypted_buffer);
811
if(decrypted_buffer_size >= 0){
812
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
813
616
written = 0;
814
617
while(written < (size_t) decrypted_buffer_size){
815
if(quit_now){
816
goto mandos_end;
817
}
818
819
ret = (int)fwrite(decrypted_buffer + written, 1,
820
(size_t)decrypted_buffer_size - written,
821
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
822
621
if(ret == 0 and ferror(stdout)){
823
622
if(debug){
824
623
fprintf(stderr, "Error writing encrypted data: %s\n",
833
632
} else {
834
633
retval = -1;
835
634
}
836
} else {
837
retval = -1;
838
635
}
839
636
840
637
/* Shutdown procedure */
841
638
842
639
mandos_end:
843
640
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
853
}
641
close(tcp_sd);
642
gnutls_deinit (session);
854
643
return retval;
855
644
}
856
645
857
646
static void resolve_callback(AvahiSServiceResolver *r,
858
647
AvahiIfIndex interface,
859
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
860
649
AvahiResolverEvent event,
861
650
const char *name,
862
651
const char *type,
867
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
868
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
869
658
flags,
870
AVAHI_GCC_UNUSED void* userdata){
871
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
872
662
873
663
/* Called whenever a service has been resolved successfully or
874
664
timed out */
875
665
876
if(quit_now){
877
return;
878
}
879
880
switch(event){
666
switch (event) {
881
667
default:
882
668
case AVAHI_RESOLVER_FAILURE:
883
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
886
672
break;
887
673
888
674
case AVAHI_RESOLVER_FOUND:
891
677
avahi_address_snprint(ip, sizeof(ip), address);
892
678
if(debug){
893
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
896
682
}
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
899
if(ret == 0){
900
avahi_simple_poll_quit(mc.simple_poll);
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
avahi_simple_poll_quit(mc->simple_poll);
901
686
}
902
687
}
903
688
}
904
689
avahi_s_service_resolver_free(r);
905
690
}
906
691
907
static void browse_callback(AvahiSServiceBrowser *b,
908
AvahiIfIndex interface,
909
AvahiProtocol protocol,
910
AvahiBrowserEvent event,
911
const char *name,
912
const char *type,
913
const char *domain,
914
AVAHI_GCC_UNUSED AvahiLookupResultFlags
915
flags,
916
AVAHI_GCC_UNUSED void* userdata){
917
assert(b);
692
static void browse_callback( AvahiSServiceBrowser *b,
693
AvahiIfIndex interface,
694
AvahiProtocol protocol,
695
AvahiBrowserEvent event,
696
const char *name,
697
const char *type,
698
const char *domain,
699
AVAHI_GCC_UNUSED AvahiLookupResultFlags
700
flags,
701
void* userdata) {
702
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
918
704
919
705
/* Called whenever a new services becomes available on the LAN or
920
706
is removed from the LAN */
921
707
922
if(quit_now){
923
return;
924
}
925
926
switch(event){
708
switch (event) {
927
709
default:
928
710
case AVAHI_BROWSER_FAILURE:
929
711
930
712
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
933
715
return;
934
716
935
717
case AVAHI_BROWSER_NEW:
938
720
the callback function is called the Avahi server will free the
939
721
resolver for us. */
940
722
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
resolve_callback, NULL) == NULL)
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
resolve_callback, mc)))
944
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
728
name, avahi_strerror(avahi_server_errno(mc->server)));
946
729
break;
947
730
948
731
case AVAHI_BROWSER_REMOVE:
957
740
}
958
741
}
959
742
960
/* stop main loop after sigterm has been called */
961
static void handle_sigterm(int sig){
962
if(quit_now){
963
return;
964
}
965
quit_now = 1;
966
signal_received = sig;
967
int old_errno = errno;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
return tmp;
972
761
}
973
762
763
974
764
int main(int argc, char *argv[]){
975
AvahiSServiceBrowser *sb = NULL;
976
int error;
977
int ret;
978
intmax_t tmpmax;
979
char *tmp;
980
int exitcode = EXIT_SUCCESS;
981
const char *interface = "eth0";
982
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
991
const char *seckey = PATHDIR "/" SECKEY;
992
const char *pubkey = PATHDIR "/" PUBKEY;
993
994
bool gnutls_initialized = false;
995
bool gpgme_initialized = false;
996
float delay = 2.5f;
997
998
struct sigaction old_sigterm_action;
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1000
1001
{
1002
struct argp_option options[] = {
1003
{ .name = "debug", .key = 128,
1004
.doc = "Debug mode", .group = 3 },
1005
{ .name = "connect", .key = 'c',
1006
.arg = "ADDRESS:PORT",
1007
.doc = "Connect directly to a specific Mandos server",
1008
.group = 1 },
1009
{ .name = "interface", .key = 'i',
1010
.arg = "NAME",
1011
.doc = "Network interface that will be used to search for"
1012
" Mandos servers",
1013
.group = 1 },
1014
{ .name = "seckey", .key = 's',
1015
.arg = "FILE",
1016
.doc = "OpenPGP secret key file base name",
1017
.group = 1 },
1018
{ .name = "pubkey", .key = 'p',
1019
.arg = "FILE",
1020
.doc = "OpenPGP public key file base name",
1021
.group = 2 },
1022
{ .name = "dh-bits", .key = 129,
1023
.arg = "BITS",
1024
.doc = "Bit length of the prime number used in the"
1025
" Diffie-Hellman key exchange",
1026
.group = 2 },
1027
{ .name = "priority", .key = 130,
1028
.arg = "STRING",
1029
.doc = "GnuTLS priority string for the TLS handshake",
1030
.group = 1 },
1031
{ .name = "delay", .key = 131,
1032
.arg = "SECONDS",
1033
.doc = "Maximum delay to wait for interface startup",
1034
.group = 2 },
1035
{ .name = NULL }
1036
};
1037
1038
error_t parse_opt(int key, char *arg,
1039
struct argp_state *state){
1040
switch(key){
1041
case 128: /* --debug */
1042
debug = true;
1043
break;
1044
case 'c': /* --connect */
1045
connect_to = arg;
1046
break;
1047
case 'i': /* --interface */
1048
interface = arg;
1049
break;
1050
case 's': /* --seckey */
1051
seckey = arg;
1052
break;
1053
case 'p': /* --pubkey */
1054
pubkey = arg;
1055
break;
1056
case 129: /* --dh-bits */
1057
errno = 0;
1058
tmpmax = strtoimax(arg, &tmp, 10);
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1063
}
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1065
break;
1066
case 130: /* --priority */
1067
mc.priority = arg;
1068
break;
1069
case 131: /* --delay */
1070
errno = 0;
1071
delay = strtof(arg, &tmp);
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
1080
break;
1081
default:
1082
return ARGP_ERR_UNKNOWN;
1083
}
1084
return 0;
1085
}
1086
1087
struct argp argp = { .options = options, .parser = parse_opt,
1088
.args_doc = "",
1089
.doc = "Mandos client -- Get and decrypt"
1090
" passwords from a Mandos server" };
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
1097
}
1098
1099
if(not debug){
1100
avahi_set_log_function(empty_log);
1101
}
1102
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1104
from the signal handler */
1105
/* Initialize the pseudo-RNG for Avahi */
1106
srand((unsigned int) time(NULL));
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1111
goto end;
1112
}
1113
1114
sigemptyset(&sigterm_action.sa_mask);
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1131
goto end;
1132
}
1133
/* Need to check if the handler is SIG_IGN before handling:
1134
| [[info:libc:Initial Signal Actions]] |
1135
| [[info:libc:Basic Signal Handling]] |
1136
*/
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1141
}
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
}
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1154
}
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1160
goto end;
1161
}
1162
}
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
765
AvahiSServiceBrowser *sb = NULL;
766
int error;
767
int ret;
768
int exitcode = EXIT_SUCCESS;
769
const char *interface = "eth0";
770
struct ifreq network;
771
int sd;
772
uid_t uid;
773
gid_t gid;
774
char *connect_to = NULL;
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
781
782
{
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
789
.group = 1 },
790
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
797
.group = 1 },
798
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
801
.group = 1 },
802
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
805
.group = 2 },
806
{ .name = "dh-bits", .key = 129,
807
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
813
{ .name = NULL }
814
};
815
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
823
debug = true;
824
break;
825
case 'c':
826
connect_to = arg;
827
break;
828
case 'i':
829
interface = arg;
830
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130:
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
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, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
}
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
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
892
} else {
893
gnutls_initalized = true;
894
}
895
896
/* If the interface is down, bring it up */
897
{
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
if(sd < 0) {
900
perror("socket");
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
strcpy(network.ifr_name, interface); /* Spurious warning */
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
if(ret == -1){
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
909
goto end;
910
}
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
if(ret == -1){
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
close(sd);
921
}
922
923
uid = getuid();
924
gid = getgid();
925
926
ret = setuid(uid);
927
if (ret == -1){
928
perror("setuid");
929
}
930
931
setgid(gid);
932
if (ret == -1){
933
perror("setgid");
934
}
935
1179
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
937
if(if_index == 0){
1181
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
1200
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
1214
}
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
1229
}
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
if(ret == -1){
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
goto end;
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
1255
break;
1256
}
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
/* Drop any group privileges we might have, just to be safe */
1289
errno = 0;
1290
ret = setgid(gid);
1291
if(ret == -1){
1292
perror("setgid");
1293
}
1294
1295
/* Drop user privileges */
1296
errno = 0;
1297
/* Will we need privileges later? */
1298
if(take_down_interface){
1299
/* Drop user privileges temporarily */
1300
ret = seteuid(uid);
1301
if(ret == -1){
1302
perror("seteuid");
1303
}
1304
} else {
1305
/* Drop user privileges permanently */
1306
ret = setuid(uid);
1307
if(ret == -1){
1308
perror("setuid");
1309
}
1310
}
1311
1312
if(quit_now){
1313
goto end;
1314
}
1315
1316
ret = init_gnutls_global(pubkey, seckey);
1317
if(ret == -1){
1318
fprintf(stderr, "init_gnutls_global failed\n");
1319
exitcode = EXIT_FAILURE;
1320
goto end;
1321
} else {
1322
gnutls_initialized = true;
1323
}
1324
1325
if(quit_now){
1326
goto end;
1327
}
1328
1329
tempdir_created = true;
1330
if(mkdtemp(tempdir) == NULL){
1331
tempdir_created = false;
1332
perror("mkdtemp");
1333
goto end;
1334
}
1335
1336
if(quit_now){
1337
goto end;
1338
}
1339
1340
if(not init_gpgme(pubkey, seckey, tempdir)){
1341
fprintf(stderr, "init_gpgme failed\n");
1342
exitcode = EXIT_FAILURE;
1343
goto end;
1344
} else {
1345
gpgme_initialized = true;
1346
}
1347
1348
if(quit_now){
1349
goto end;
1350
}
1351
1352
if(connect_to != NULL){
1353
/* Connect directly, do not use Zeroconf */
1354
/* (Mainly meant for debugging) */
1355
char *address = strrchr(connect_to, ':');
1356
if(address == NULL){
1357
fprintf(stderr, "No colon in address\n");
1358
exitcode = EXIT_FAILURE;
1359
goto end;
1360
}
1361
1362
if(quit_now){
1363
goto end;
1364
}
1365
1366
uint16_t port;
1367
errno = 0;
1368
tmpmax = strtoimax(address+1, &tmp, 10);
1369
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1370
or tmpmax != (uint16_t)tmpmax){
1371
fprintf(stderr, "Bad port number\n");
1372
exitcode = EXIT_FAILURE;
1373
goto end;
1374
}
1375
1376
if(quit_now){
1377
goto end;
1378
}
1379
1380
port = (uint16_t)tmpmax;
1381
*address = '\0';
1382
address = connect_to;
1383
/* Colon in address indicates IPv6 */
1384
int af;
1385
if(strchr(address, ':') != NULL){
1386
af = AF_INET6;
1387
} else {
1388
af = AF_INET;
1389
}
1390
1391
if(quit_now){
1392
goto end;
1393
}
1394
1395
ret = start_mandos_communication(address, port, if_index, af);
1396
if(ret < 0){
1397
exitcode = EXIT_FAILURE;
1398
} else {
1399
exitcode = EXIT_SUCCESS;
1400
}
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
{
1409
AvahiServerConfig config;
1410
/* Do not publish any local Zeroconf records */
1411
avahi_server_config_init(&config);
1412
config.publish_hinfo = 0;
1413
config.publish_addresses = 0;
1414
config.publish_workstation = 0;
1415
config.publish_domain = 0;
1416
1417
/* Allocate a new server */
1418
mc.server = avahi_server_new(avahi_simple_poll_get
1419
(mc.simple_poll), &config, NULL,
1420
NULL, &error);
1421
1422
/* Free the Avahi configuration data */
1423
avahi_server_config_free(&config);
1424
}
1425
1426
/* Check if creating the Avahi server object succeeded */
1427
if(mc.server == NULL){
1428
fprintf(stderr, "Failed to create Avahi server: %s\n",
1429
avahi_strerror(error));
1430
exitcode = EXIT_FAILURE;
1431
goto end;
1432
}
1433
1434
if(quit_now){
1435
goto end;
1436
}
1437
1438
/* Create the Avahi service browser */
1439
sb = avahi_s_service_browser_new(mc.server, if_index,
1440
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1441
NULL, 0, browse_callback, NULL);
1442
if(sb == NULL){
1443
fprintf(stderr, "Failed to create service browser: %s\n",
1444
avahi_strerror(avahi_server_errno(mc.server)));
1445
exitcode = EXIT_FAILURE;
1446
goto end;
1447
}
1448
1449
if(quit_now){
1450
goto end;
1451
}
1452
1453
/* Run the main loop */
1454
1455
if(debug){
1456
fprintf(stderr, "Starting Avahi loop search\n");
1457
}
1458
1459
avahi_simple_poll_loop(mc.simple_poll);
1460
939
exit(EXIT_FAILURE);
940
}
941
942
if(connect_to != NULL){
943
/* Connect directly, do not use Zeroconf */
944
/* (Mainly meant for debugging) */
945
char *address = strrchr(connect_to, ':');
946
if(address == NULL){
947
fprintf(stderr, "No colon in address\n");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
errno = 0;
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
953
if(errno){
954
perror("Bad port number");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
*address = '\0';
959
address = connect_to;
960
ret = start_mandos_communication(address, port, if_index, &mc);
961
if(ret < 0){
962
exitcode = EXIT_FAILURE;
963
} else {
964
exitcode = EXIT_SUCCESS;
965
}
966
goto end;
967
}
968
969
if (not debug){
970
avahi_set_log_function(empty_log);
971
}
972
973
/* Initialize the pseudo-RNG for Avahi */
974
srand((unsigned int) time(NULL));
975
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
980
" object.\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
}
984
985
{
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
993
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
997
NULL, &error);
998
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1001
}
1002
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
avahi_strerror(error));
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
1013
AVAHI_PROTO_INET6,
1014
"_mandos._tcp", NULL, 0,
1015
browse_callback, &mc);
1016
if (sb == NULL) {
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1020
goto end;
1021
}
1022
1023
/* Run the main loop */
1024
1025
if (debug){
1026
fprintf(stderr, "Starting Avahi loop search\n");
1027
}
1028
1029
avahi_simple_poll_loop(mc.simple_poll);
1030
1461
1031
end:
1462
1463
if(debug){
1464
fprintf(stderr, "%s exiting\n", argv[0]);
1465
}
1466
1467
/* Cleanup things */
1468
if(sb != NULL)
1469
avahi_s_service_browser_free(sb);
1470
1471
if(mc.server != NULL)
1472
avahi_server_free(mc.server);
1473
1474
if(mc.simple_poll != NULL)
1475
avahi_simple_poll_free(mc.simple_poll);
1476
1477
if(gnutls_initialized){
1478
gnutls_certificate_free_credentials(mc.cred);
1479
gnutls_global_deinit();
1480
gnutls_dh_params_deinit(mc.dh_params);
1481
}
1482
1483
if(gpgme_initialized){
1484
gpgme_release(mc.ctx);
1485
}
1486
1487
/* Take down the network interface */
1488
if(take_down_interface){
1489
/* Re-raise priviliges */
1490
errno = 0;
1491
ret = seteuid(0);
1492
if(ret == -1){
1493
perror("seteuid");
1494
}
1495
if(geteuid() == 0){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_UP) {
1500
network.ifr_flags &= ~IFF_UP; /* clear flag */
1501
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1502
if(ret == -1){
1503
perror("ioctl SIOCSIFFLAGS");
1504
}
1505
}
1506
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1507
if(ret == -1){
1508
perror("close");
1509
}
1510
/* Lower privileges, permanently this time */
1511
errno = 0;
1512
ret = setuid(uid);
1513
if(ret == -1){
1514
perror("setuid");
1515
}
1516
}
1517
}
1518
1519
/* Removes the temp directory used by GPGME */
1520
if(tempdir_created){
1521
DIR *d;
1522
struct dirent *direntry;
1523
d = opendir(tempdir);
1524
if(d == NULL){
1525
if(errno != ENOENT){
1526
perror("opendir");
1527
}
1528
} else {
1529
while(true){
1530
direntry = readdir(d);
1531
if(direntry == NULL){
1532
break;
1533
}
1534
/* Skip "." and ".." */
1535
if(direntry->d_name[0] == '.'
1536
and (direntry->d_name[1] == '\0'
1537
or (direntry->d_name[1] == '.'
1538
and direntry->d_name[2] == '\0'))){
1539
continue;
1540
}
1541
char *fullname = NULL;
1542
ret = asprintf(&fullname, "%s/%s", tempdir,
1543
direntry->d_name);
1544
if(ret < 0){
1545
perror("asprintf");
1546
continue;
1547
}
1548
ret = remove(fullname);
1549
if(ret == -1){
1550
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1551
strerror(errno));
1552
}
1553
free(fullname);
1554
}
1555
closedir(d);
1556
}
1557
ret = rmdir(tempdir);
1558
if(ret == -1 and errno != ENOENT){
1559
perror("rmdir");
1560
}
1561
}
1562
1563
if(quit_now){
1564
sigemptyset(&old_sigterm_action.sa_mask);
1565
old_sigterm_action.sa_handler = SIG_DFL;
1566
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1567
if(ret == -1){
1568
perror("sigaction");
1569
}
1570
raise(signal_received);
1571
}
1572
1573
return exitcode;
1032
1033
if (debug){
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1035
}
1036
1037
/* Cleanup things */
1038
if (sb != NULL)
1039
avahi_s_service_browser_free(sb);
1040
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
1043
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfile);
1047
free(seckeyfile);
1048
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1052
}
1053
1054
return exitcode;
1574
1055
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0