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- Committer: Teddy Hogeborn
- Date: 2008-08-16 03:29:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816032908-ihw7c05r2mnyk389
Add feature to specify custom environment variables for plugins.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- 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
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, 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
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
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
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, sigaction,
84
sig_atomic_t */
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
104
86
gnutls_*
105
87
init_gnutls_session(),
106
88
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
90
GNUTLS_OPENPGP_FMT_BASE64 */
110
91
111
92
/* GPGME */
117
98
118
99
#define BUFFER_SIZE 256
119
100
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
125
103
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
127
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
106
129
107
/* Used for passing in values through the Avahi callback functions */
134
112
unsigned int dh_bits;
135
113
gnutls_dh_params_t dh_params;
136
114
const char *priority;
137
gpgme_ctx_t ctx;
138
115
} mandos_context;
139
116
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
117
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
148
120
* "buffer_length" is how much is already used.
149
121
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
123
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
126
if (buffer == NULL){
155
127
return 0;
156
128
}
157
129
buffer_capacity += BUFFER_SIZE;
160
132
}
161
133
162
134
/*
163
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
164
137
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
168
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
169
148
gpgme_engine_info_t engine_info;
170
149
171
172
/*
173
* Helper function to insert pub and seckey to the engine keyring.
174
*/
175
bool import_key(const char *filename){
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");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
152
}
210
153
211
154
/* Init GPGME */
212
155
gpgme_check_version(NULL);
213
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
215
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
159
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
160
return -1;
218
161
}
219
162
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){
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
223
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
167
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
168
return -1;
226
169
}
227
170
while(engine_info != NULL){
228
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
231
174
break;
232
175
}
233
176
engine_info = engine_info->next;
234
177
}
235
178
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");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
270
181
}
271
182
272
183
/* Create new GPGME data buffer from memory cryptotext */
273
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
185
0);
275
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
276
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
188
gpgme_strsource(rc), gpgme_strerror(rc));
278
189
return -1;
280
191
281
192
/* Create new empty GPGME data buffer for the plaintext */
282
193
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
284
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
196
gpgme_strsource(rc), gpgme_strerror(rc));
286
197
gpgme_data_release(dh_crypto);
287
198
return -1;
288
199
}
289
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
290
210
/* Decrypt data from the cryptotext data buffer to the plaintext
291
211
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
294
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
215
gpgme_strsource(rc), gpgme_strerror(rc));
296
216
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;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
312
240
while(recipient != NULL){
313
241
fprintf(stderr, "Public key algorithm: %s\n",
314
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
248
}
321
249
}
322
250
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
251
}
329
252
330
253
/* 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");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
333
256
plaintext_length = -1;
334
257
goto decrypt_end;
335
258
}
336
259
337
260
*plaintext = NULL;
338
261
while(true){
339
plaintext_capacity = incbuffer(plaintext,
262
plaintext_capacity = adjustbuffer(plaintext,
340
263
(size_t)plaintext_length,
341
264
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
344
267
plaintext_length = -1;
345
268
goto decrypt_end;
346
269
}
348
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
272
BUFFER_SIZE);
350
273
/* Print the data, if any */
351
if(ret == 0){
274
if (ret == 0){
352
275
/* EOF */
353
276
break;
354
277
}
359
282
}
360
283
plaintext_length += ret;
361
284
}
362
285
363
286
if(debug){
364
287
fprintf(stderr, "Decrypted password is: ");
365
288
for(ssize_t i = 0; i < plaintext_length; i++){
378
301
return plaintext_length;
379
302
}
380
303
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)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
385
307
ret = "(unknown)";
386
308
return ret;
387
309
}
392
314
fprintf(stderr, "GnuTLS: %s", string);
393
315
}
394
316
395
static int init_gnutls_global(const char *pubkeyfilename,
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
396
319
const char *seckeyfilename){
397
320
int ret;
398
321
401
324
}
402
325
403
326
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
407
330
return -1;
408
331
}
409
332
410
if(debug){
333
if (debug){
411
334
/* "Use a log level over 10 to enable all debugging options."
412
335
* - GnuTLS manual
413
336
*/
416
339
}
417
340
418
341
/* 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();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
427
347
return -1;
428
348
}
429
349
430
350
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
433
353
seckeyfilename);
434
354
}
435
355
436
356
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
438
358
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
359
if (ret != GNUTLS_E_SUCCESS) {
440
360
fprintf(stderr,
441
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
444
364
safer_gnutls_strerror(ret));
445
365
goto globalfail;
446
366
}
447
367
448
368
/* 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
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
464
384
return 0;
465
385
466
386
globalfail:
467
468
gnutls_certificate_free_credentials(mc.cred);
387
388
gnutls_certificate_free_credentials(mc->cred);
469
389
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
390
return -1;
391
472
392
}
473
393
474
static int init_gnutls_session(gnutls_session_t *session){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
475
396
int ret;
476
397
/* GnuTLS session creation */
477
398
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
479
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
401
safer_gnutls_strerror(ret));
481
402
}
482
403
483
404
{
484
405
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
487
408
fprintf(stderr, "Syntax error at: %s\n", err);
488
409
fprintf(stderr, "GnuTLS error: %s\n",
489
410
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
411
gnutls_deinit (*session);
491
412
return -1;
492
413
}
493
414
}
494
415
495
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
498
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
420
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
421
gnutls_deinit (*session);
501
422
return -1;
502
423
}
503
424
504
425
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
507
428
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
430
510
431
return 0;
511
432
}
517
438
/* Called when a Mandos server is found */
518
439
static int start_mandos_communication(const char *ip, uint16_t port,
519
440
AvahiIfIndex if_index,
520
int af){
441
mandos_context *mc){
521
442
int ret, tcp_sd;
522
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
527
444
char *buffer = NULL;
528
445
char *decrypted_buffer;
529
446
size_t buffer_length = 0;
531
448
ssize_t decrypted_buffer_size;
532
449
size_t written;
533
450
int retval = 0;
451
char interface[IF_NAMESIZE];
534
452
gnutls_session_t session;
535
int pf; /* Protocol family */
536
537
switch(af){
538
case AF_INET6:
539
pf = PF_INET6;
540
break;
541
case AF_INET:
542
pf = PF_INET;
543
break;
544
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
546
return -1;
547
}
548
549
ret = init_gnutls_session(&session);
550
if(ret != 0){
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
551
456
return -1;
552
457
}
553
458
554
459
if(debug){
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
556
461
"\n", ip, port);
557
462
}
558
463
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
560
if(tcp_sd < 0){
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
561
466
perror("socket");
562
467
return -1;
563
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
476
}
564
477
565
memset(&to, 0, sizeof(to));
566
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
569
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
572
}
573
if(ret < 0 ){
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
574
484
perror("inet_pton");
575
485
return -1;
576
486
}
578
488
fprintf(stderr, "Bad address: %s\n", ip);
579
489
return -1;
580
490
}
581
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
593
}
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
596
}
597
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
601
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
492
493
to.in6.sin6_scope_id = (uint32_t)if_index;
602
494
603
495
if(debug){
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
608
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
611
}
612
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
615
}
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
627
501
perror("inet_ntop");
628
502
} else {
629
503
if(strcmp(addrstr, ip) != 0){
632
506
}
633
507
}
634
508
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
641
511
perror("connect");
642
512
return -1;
643
513
}
644
514
645
515
const char *out = mandos_protocol_version;
646
516
written = 0;
647
while(true){
517
while (true){
648
518
size_t out_size = strlen(out);
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
650
520
out_size - written));
651
if(ret == -1){
521
if (ret == -1){
652
522
perror("write");
653
523
retval = -1;
654
524
goto mandos_end;
657
527
if(written < out_size){
658
528
continue;
659
529
} else {
660
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
661
531
written = 0;
662
532
out = "\r\n";
663
533
} else {
665
535
}
666
536
}
667
537
}
668
538
669
539
if(debug){
670
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
541
}
672
542
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
675
545
do{
676
ret = gnutls_handshake(session);
546
ret = gnutls_handshake (session);
677
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
548
679
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
680
550
if(debug){
681
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
682
gnutls_perror(ret);
552
gnutls_perror (ret);
683
553
}
684
554
retval = -1;
685
555
goto mandos_end;
688
558
/* Read OpenPGP packet that contains the wanted password */
689
559
690
560
if(debug){
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
692
562
ip);
693
563
}
694
564
695
565
while(true){
696
buffer_capacity = incbuffer(&buffer, buffer_length,
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
697
567
buffer_capacity);
698
if(buffer_capacity == 0){
699
perror("incbuffer");
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
700
570
retval = -1;
701
571
goto mandos_end;
702
572
}
703
573
704
sret = gnutls_record_recv(session, buffer+buffer_length,
705
BUFFER_SIZE);
706
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
707
577
break;
708
578
}
709
if(sret < 0){
710
switch(sret){
579
if (ret < 0){
580
switch(ret){
711
581
case GNUTLS_E_INTERRUPTED:
712
582
case GNUTLS_E_AGAIN:
713
583
break;
714
584
case GNUTLS_E_REHANDSHAKE:
715
585
do{
716
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
717
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
718
if(ret < 0){
588
if (ret < 0){
719
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
720
gnutls_perror(ret);
590
gnutls_perror (ret);
721
591
retval = -1;
722
592
goto mandos_end;
723
593
}
726
596
fprintf(stderr, "Unknown error while reading data from"
727
597
" encrypted session with Mandos server\n");
728
598
retval = -1;
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
730
600
goto mandos_end;
731
601
}
732
602
} else {
733
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
734
604
}
735
605
}
736
606
738
608
fprintf(stderr, "Closing TLS session\n");
739
609
}
740
610
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
742
612
743
if(buffer_length > 0){
613
if (buffer_length > 0){
744
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
615
buffer_length,
746
&decrypted_buffer);
747
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
748
619
written = 0;
749
620
while(written < (size_t) decrypted_buffer_size){
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
752
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
753
624
if(ret == 0 and ferror(stdout)){
754
625
if(debug){
755
626
fprintf(stderr, "Error writing encrypted data: %s\n",
764
635
} else {
765
636
retval = -1;
766
637
}
767
} else {
768
retval = -1;
769
638
}
770
639
771
640
/* Shutdown procedure */
772
641
773
642
mandos_end:
774
643
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
778
}
779
gnutls_deinit(session);
644
close(tcp_sd);
645
gnutls_deinit (session);
780
646
return retval;
781
647
}
782
648
783
649
static void resolve_callback(AvahiSServiceResolver *r,
784
650
AvahiIfIndex interface,
785
AvahiProtocol proto,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
786
652
AvahiResolverEvent event,
787
653
const char *name,
788
654
const char *type,
793
659
AVAHI_GCC_UNUSED AvahiStringList *txt,
794
660
AVAHI_GCC_UNUSED AvahiLookupResultFlags
795
661
flags,
796
AVAHI_GCC_UNUSED void* userdata){
797
assert(r);
662
void* userdata) {
663
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
798
665
799
666
/* Called whenever a service has been resolved successfully or
800
667
timed out */
801
668
802
switch(event){
669
switch (event) {
803
670
default:
804
671
case AVAHI_RESOLVER_FAILURE:
805
672
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
806
673
" of type '%s' in domain '%s': %s\n", name, type, domain,
807
avahi_strerror(avahi_server_errno(mc.server)));
674
avahi_strerror(avahi_server_errno(mc->server)));
808
675
break;
809
676
810
677
case AVAHI_RESOLVER_FOUND:
813
680
avahi_address_snprint(ip, sizeof(ip), address);
814
681
if(debug){
815
682
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
816
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
817
ip, (intmax_t)interface, port);
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
818
685
}
819
int ret = start_mandos_communication(ip, port, interface,
820
avahi_proto_to_af(proto));
821
if(ret == 0){
822
avahi_simple_poll_quit(mc.simple_poll);
686
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
688
avahi_simple_poll_quit(mc->simple_poll);
823
689
}
824
690
}
825
691
}
826
692
avahi_s_service_resolver_free(r);
827
693
}
828
694
829
static void browse_callback(AvahiSServiceBrowser *b,
830
AvahiIfIndex interface,
831
AvahiProtocol protocol,
832
AvahiBrowserEvent event,
833
const char *name,
834
const char *type,
835
const char *domain,
836
AVAHI_GCC_UNUSED AvahiLookupResultFlags
837
flags,
838
AVAHI_GCC_UNUSED void* userdata){
839
assert(b);
695
static void browse_callback( AvahiSServiceBrowser *b,
696
AvahiIfIndex interface,
697
AvahiProtocol protocol,
698
AvahiBrowserEvent event,
699
const char *name,
700
const char *type,
701
const char *domain,
702
AVAHI_GCC_UNUSED AvahiLookupResultFlags
703
flags,
704
void* userdata) {
705
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
840
707
841
708
/* Called whenever a new services becomes available on the LAN or
842
709
is removed from the LAN */
843
710
844
switch(event){
711
switch (event) {
845
712
default:
846
713
case AVAHI_BROWSER_FAILURE:
847
714
848
715
fprintf(stderr, "(Avahi browser) %s\n",
849
avahi_strerror(avahi_server_errno(mc.server)));
850
avahi_simple_poll_quit(mc.simple_poll);
716
avahi_strerror(avahi_server_errno(mc->server)));
717
avahi_simple_poll_quit(mc->simple_poll);
851
718
return;
852
719
853
720
case AVAHI_BROWSER_NEW:
856
723
the callback function is called the Avahi server will free the
857
724
resolver for us. */
858
725
859
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
860
name, type, domain, protocol, 0,
861
resolve_callback, NULL) == NULL)
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
727
protocol, name, type, domain,
728
AVAHI_PROTO_INET6, 0,
729
resolve_callback, mc)))
862
730
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
863
name, avahi_strerror(avahi_server_errno(mc.server)));
731
name, avahi_strerror(avahi_server_errno(mc->server)));
864
732
break;
865
733
866
734
case AVAHI_BROWSER_REMOVE:
875
743
}
876
744
}
877
745
878
sig_atomic_t quit_now = 0;
879
880
/* stop main loop after sigterm has been called */
881
static void handle_sigterm(__attribute__((unused)) int sig){
882
if(quit_now){
883
return;
884
}
885
quit_now = 1;
886
int old_errno = errno;
887
if(mc.simple_poll != NULL){
888
avahi_simple_poll_quit(mc.simple_poll);
889
}
890
errno = old_errno;
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
749
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
891
755
}
892
756
757
893
758
int main(int argc, char *argv[]){
894
AvahiSServiceBrowser *sb = NULL;
895
int error;
896
int ret;
897
intmax_t tmpmax;
898
char *tmp;
899
int exitcode = EXIT_SUCCESS;
900
const char *interface = "eth0";
901
struct ifreq network;
902
int sd = -1;
903
bool interface_taken_up = false;
904
uid_t uid;
905
gid_t gid;
906
char *connect_to = NULL;
907
char tempdir[] = "/tmp/mandosXXXXXX";
908
bool tempdir_created = false;
909
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
910
const char *seckey = PATHDIR "/" SECKEY;
911
const char *pubkey = PATHDIR "/" PUBKEY;
912
913
bool gnutls_initialized = false;
914
bool gpgme_initialized = false;
915
float delay = 2.5f;
916
917
struct sigaction old_sigterm_action;
918
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
919
920
{
921
struct argp_option options[] = {
922
{ .name = "debug", .key = 128,
923
.doc = "Debug mode", .group = 3 },
924
{ .name = "connect", .key = 'c',
925
.arg = "ADDRESS:PORT",
926
.doc = "Connect directly to a specific Mandos server",
927
.group = 1 },
928
{ .name = "interface", .key = 'i',
929
.arg = "NAME",
930
.doc = "Network interface that will be used to search for"
931
" Mandos servers",
932
.group = 1 },
933
{ .name = "seckey", .key = 's',
934
.arg = "FILE",
935
.doc = "OpenPGP secret key file base name",
936
.group = 1 },
937
{ .name = "pubkey", .key = 'p',
938
.arg = "FILE",
939
.doc = "OpenPGP public key file base name",
940
.group = 2 },
941
{ .name = "dh-bits", .key = 129,
942
.arg = "BITS",
943
.doc = "Bit length of the prime number used in the"
944
" Diffie-Hellman key exchange",
945
.group = 2 },
946
{ .name = "priority", .key = 130,
947
.arg = "STRING",
948
.doc = "GnuTLS priority string for the TLS handshake",
949
.group = 1 },
950
{ .name = "delay", .key = 131,
951
.arg = "SECONDS",
952
.doc = "Maximum delay to wait for interface startup",
953
.group = 2 },
954
{ .name = NULL }
955
};
956
957
error_t parse_opt(int key, char *arg,
958
struct argp_state *state){
959
switch(key){
960
case 128: /* --debug */
961
debug = true;
962
break;
963
case 'c': /* --connect */
964
connect_to = arg;
965
break;
966
case 'i': /* --interface */
967
interface = arg;
968
break;
969
case 's': /* --seckey */
970
seckey = arg;
971
break;
972
case 'p': /* --pubkey */
973
pubkey = arg;
974
break;
975
case 129: /* --dh-bits */
976
errno = 0;
977
tmpmax = strtoimax(arg, &tmp, 10);
978
if(errno != 0 or tmp == arg or *tmp != '\0'
979
or tmpmax != (typeof(mc.dh_bits))tmpmax){
980
fprintf(stderr, "Bad number of DH bits\n");
981
exit(EXIT_FAILURE);
982
}
983
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
984
break;
985
case 130: /* --priority */
986
mc.priority = arg;
987
break;
988
case 131: /* --delay */
989
errno = 0;
990
delay = strtof(arg, &tmp);
991
if(errno != 0 or tmp == arg or *tmp != '\0'){
992
fprintf(stderr, "Bad delay\n");
993
exit(EXIT_FAILURE);
994
}
995
break;
996
case ARGP_KEY_ARG:
997
argp_usage(state);
998
case ARGP_KEY_END:
999
break;
1000
default:
1001
return ARGP_ERR_UNKNOWN;
1002
}
1003
return 0;
1004
}
1005
1006
struct argp argp = { .options = options, .parser = parse_opt,
1007
.args_doc = "",
1008
.doc = "Mandos client -- Get and decrypt"
1009
" passwords from a Mandos server" };
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1014
goto end;
1015
}
1016
}
1017
1018
if(not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1023
from the signal handler */
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if(mc.simple_poll == NULL){
1028
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
sigemptyset(&sigterm_action.sa_mask);
1034
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1035
if(ret == -1){
1036
perror("sigaddset");
1037
exitcode = EXIT_FAILURE;
1038
goto end;
1039
}
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1041
if(ret == -1){
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1044
goto end;
1045
}
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1047
if(ret == -1){
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
1059
/* If the interface is down, bring it up */
1060
if(interface[0] != '\0'){
1061
#ifdef __linux__
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1063
messages to mess up the prompt */
1064
ret = klogctl(8, NULL, 5);
1065
bool restore_loglevel = true;
1066
if(ret == -1){
1067
restore_loglevel = false;
1068
perror("klogctl");
1069
}
1070
#endif /* __linux__ */
1071
1072
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1073
if(sd < 0){
1074
perror("socket");
1075
exitcode = EXIT_FAILURE;
1076
#ifdef __linux__
1077
if(restore_loglevel){
1078
ret = klogctl(7, NULL, 0);
1079
if(ret == -1){
1080
perror("klogctl");
1081
}
1082
}
1083
#endif /* __linux__ */
1084
goto end;
1085
}
1086
strcpy(network.ifr_name, interface);
1087
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1088
if(ret == -1){
1089
perror("ioctl SIOCGIFFLAGS");
1090
#ifdef __linux__
1091
if(restore_loglevel){
1092
ret = klogctl(7, NULL, 0);
1093
if(ret == -1){
1094
perror("klogctl");
1095
}
1096
}
1097
#endif /* __linux__ */
1098
exitcode = EXIT_FAILURE;
1099
goto end;
1100
}
1101
if((network.ifr_flags & IFF_UP) == 0){
1102
network.ifr_flags |= IFF_UP;
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1104
if(ret == -1){
1105
perror("ioctl SIOCSIFFLAGS");
1106
exitcode = EXIT_FAILURE;
1107
#ifdef __linux__
1108
if(restore_loglevel){
1109
ret = klogctl(7, NULL, 0);
1110
if(ret == -1){
1111
perror("klogctl");
759
AvahiSServiceBrowser *sb = NULL;
760
int error;
761
int ret;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
765
int sd;
766
uid_t uid;
767
gid_t gid;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
777
778
{
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
785
.group = 1 },
786
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
793
.group = 1 },
794
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
797
.group = 1 },
798
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
801
.group = 2 },
802
{ .name = "dh-bits", .key = 129,
803
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
805
.group = 2 },
806
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
809
{ .name = NULL }
810
};
811
812
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
819
debug = true;
820
break;
821
case 'c':
822
connect_to = arg;
823
break;
824
case 'i':
825
interface = arg;
826
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
841
exit(EXIT_FAILURE);
1112
842
}
843
break;
844
case 130:
845
mc.priority = arg;
846
break;
847
case ARGP_KEY_ARG:
848
argp_usage (state);
849
case ARGP_KEY_END:
850
break;
851
default:
852
return ARGP_ERR_UNKNOWN;
1113
853
}
1114
#endif /* __linux__ */
1115
goto end;
1116
}
1117
interface_taken_up = true;
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
854
return 0;
855
}
856
857
struct argp argp = { .options = options, .parser = parse_opt,
858
.args_doc = "",
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
865
goto end;
866
}
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
891
892
/* If the interface is down, bring it up */
893
{
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
895
if(sd < 0) {
896
perror("socket");
897
exitcode = EXIT_FAILURE;
898
goto end;
899
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
1121
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
902
if(ret == -1){
1123
903
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
break;
1126
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
if(not interface_taken_up){
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1137
}
1138
}
1139
#ifdef __linux__
1140
if(restore_loglevel){
1141
/* Restores kernel loglevel to default */
1142
ret = klogctl(7, NULL, 0);
1143
if(ret == -1){
1144
perror("klogctl");
1145
}
1146
}
1147
#endif /* __linux__ */
1148
}
1149
1150
uid = getuid();
1151
gid = getgid();
1152
1153
errno = 0;
1154
setgid(gid);
1155
if(ret == -1){
1156
perror("setgid");
1157
}
1158
1159
ret = setuid(uid);
1160
if(ret == -1){
1161
perror("setuid");
1162
}
1163
1164
ret = init_gnutls_global(pubkey, seckey);
1165
if(ret == -1){
1166
fprintf(stderr, "init_gnutls_global failed\n");
1167
exitcode = EXIT_FAILURE;
1168
goto end;
1169
} else {
1170
gnutls_initialized = true;
1171
}
1172
1173
if(mkdtemp(tempdir) == NULL){
1174
perror("mkdtemp");
1175
goto end;
1176
}
1177
tempdir_created = true;
1178
1179
if(not init_gpgme(pubkey, seckey, tempdir)){
1180
fprintf(stderr, "init_gpgme failed\n");
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
} else {
1184
gpgme_initialized = true;
1185
}
1186
1187
if(interface[0] != '\0'){
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
910
if(ret == -1){
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
913
goto end;
914
}
915
}
916
close(sd);
917
}
918
919
uid = getuid();
920
gid = getgid();
921
922
ret = setuid(uid);
923
if (ret == -1){
924
perror("setuid");
925
}
926
927
setgid(gid);
928
if (ret == -1){
929
perror("setgid");
930
}
931
1188
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
1189
933
if(if_index == 0){
1190
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1191
exitcode = EXIT_FAILURE;
1192
goto end;
1193
}
1194
}
1195
1196
if(connect_to != NULL){
1197
/* Connect directly, do not use Zeroconf */
1198
/* (Mainly meant for debugging) */
1199
char *address = strrchr(connect_to, ':');
1200
if(address == NULL){
1201
fprintf(stderr, "No colon in address\n");
1202
exitcode = EXIT_FAILURE;
1203
goto end;
1204
}
1205
uint16_t port;
1206
errno = 0;
1207
tmpmax = strtoimax(address+1, &tmp, 10);
1208
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1209
or tmpmax != (uint16_t)tmpmax){
1210
fprintf(stderr, "Bad port number\n");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
port = (uint16_t)tmpmax;
1215
*address = '\0';
1216
address = connect_to;
1217
/* Colon in address indicates IPv6 */
1218
int af;
1219
if(strchr(address, ':') != NULL){
1220
af = AF_INET6;
1221
} else {
1222
af = AF_INET;
1223
}
1224
ret = start_mandos_communication(address, port, if_index, af);
1225
if(ret < 0){
1226
exitcode = EXIT_FAILURE;
1227
} else {
1228
exitcode = EXIT_SUCCESS;
1229
}
1230
goto end;
1231
}
1232
1233
{
1234
AvahiServerConfig config;
1235
/* Do not publish any local Zeroconf records */
1236
avahi_server_config_init(&config);
1237
config.publish_hinfo = 0;
1238
config.publish_addresses = 0;
1239
config.publish_workstation = 0;
1240
config.publish_domain = 0;
1241
1242
/* Allocate a new server */
1243
mc.server = avahi_server_new(avahi_simple_poll_get
1244
(mc.simple_poll), &config, NULL,
1245
NULL, &error);
1246
1247
/* Free the Avahi configuration data */
1248
avahi_server_config_free(&config);
1249
}
1250
1251
/* Check if creating the Avahi server object succeeded */
1252
if(mc.server == NULL){
1253
fprintf(stderr, "Failed to create Avahi server: %s\n",
1254
avahi_strerror(error));
1255
exitcode = EXIT_FAILURE;
1256
goto end;
1257
}
1258
1259
/* Create the Avahi service browser */
1260
sb = avahi_s_service_browser_new(mc.server, if_index,
1261
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1262
NULL, 0, browse_callback, NULL);
1263
if(sb == NULL){
1264
fprintf(stderr, "Failed to create service browser: %s\n",
1265
avahi_strerror(avahi_server_errno(mc.server)));
1266
exitcode = EXIT_FAILURE;
1267
goto end;
1268
}
1269
1270
/* Run the main loop */
1271
1272
if(debug){
1273
fprintf(stderr, "Starting Avahi loop search\n");
1274
}
1275
1276
avahi_simple_poll_loop(mc.simple_poll);
1277
935
exit(EXIT_FAILURE);
936
}
937
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
942
if(address == NULL){
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
945
goto end;
946
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
952
goto end;
953
}
954
*address = '\0';
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
957
if(ret < 0){
958
exitcode = EXIT_FAILURE;
959
} else {
960
exitcode = EXIT_SUCCESS;
961
}
962
goto end;
963
}
964
965
if (not debug){
966
avahi_set_log_function(empty_log);
967
}
968
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
971
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
976
" object.\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
}
980
981
{
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
989
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
993
NULL, &error);
994
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
997
}
998
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
AVAHI_PROTO_INET6,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1012
if (sb == NULL) {
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
1019
/* Run the main loop */
1020
1021
if (debug){
1022
fprintf(stderr, "Starting Avahi loop search\n");
1023
}
1024
1025
avahi_simple_poll_loop(mc.simple_poll);
1026
1278
1027
end:
1279
1280
if(debug){
1281
fprintf(stderr, "%s exiting\n", argv[0]);
1282
}
1283
1284
/* Cleanup things */
1285
if(sb != NULL)
1286
avahi_s_service_browser_free(sb);
1287
1288
if(mc.server != NULL)
1289
avahi_server_free(mc.server);
1290
1291
if(mc.simple_poll != NULL)
1292
avahi_simple_poll_free(mc.simple_poll);
1293
1294
if(gnutls_initialized){
1295
gnutls_certificate_free_credentials(mc.cred);
1296
gnutls_global_deinit();
1297
gnutls_dh_params_deinit(mc.dh_params);
1298
}
1299
1300
if(gpgme_initialized){
1301
gpgme_release(mc.ctx);
1302
}
1303
1304
/* Take down the network interface */
1305
if(interface_taken_up){
1306
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1307
if(ret == -1){
1308
perror("ioctl SIOCGIFFLAGS");
1309
} else if(network.ifr_flags & IFF_UP) {
1310
network.ifr_flags &= ~IFF_UP; /* clear flag */
1311
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1312
if(ret == -1){
1313
perror("ioctl SIOCSIFFLAGS");
1314
}
1315
}
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
1322
/* Removes the temp directory used by GPGME */
1323
if(tempdir_created){
1324
DIR *d;
1325
struct dirent *direntry;
1326
d = opendir(tempdir);
1327
if(d == NULL){
1328
if(errno != ENOENT){
1329
perror("opendir");
1330
}
1331
} else {
1332
while(true){
1333
direntry = readdir(d);
1334
if(direntry == NULL){
1335
break;
1336
}
1337
/* Skip "." and ".." */
1338
if(direntry->d_name[0] == '.'
1339
and (direntry->d_name[1] == '\0'
1340
or (direntry->d_name[1] == '.'
1341
and direntry->d_name[2] == '\0'))){
1342
continue;
1343
}
1344
char *fullname = NULL;
1345
ret = asprintf(&fullname, "%s/%s", tempdir,
1346
direntry->d_name);
1347
if(ret < 0){
1348
perror("asprintf");
1349
continue;
1350
}
1351
ret = remove(fullname);
1352
if(ret == -1){
1353
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1354
strerror(errno));
1355
}
1356
free(fullname);
1357
}
1358
closedir(d);
1359
}
1360
ret = rmdir(tempdir);
1361
if(ret == -1 and errno != ENOENT){
1362
perror("rmdir");
1363
}
1364
}
1365
1366
return exitcode;
1028
1029
if (debug){
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1031
}
1032
1033
/* Cleanup things */
1034
if (sb != NULL)
1035
avahi_s_service_browser_free(sb);
1036
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1048
}
1049
1050
return exitcode;
1367
1051
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0