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24.1.51
(compared to revision 24.1.156)
: 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
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(),
75
setgid(), pause() */
62
getuid(), getgid(), setuid(),
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
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
91
71
92
72
/* Avahi */
93
73
/* All Avahi types, constants and functions
101
81
#include <avahi-common/error.h>
102
82
103
83
/* GnuTLS */
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
106
85
gnutls_*
107
86
init_gnutls_session(),
108
87
GNUTLS_* */
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
111
89
GNUTLS_OPENPGP_FMT_BASE64 */
112
90
113
91
/* GPGME */
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
116
93
gpgme_*
117
94
GPGME_PROTOCOL_OpenPGP,
118
95
GPG_ERR_NO_* */
119
96
120
97
#define BUFFER_SIZE 256
121
98
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
125
126
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
127
101
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
102
const char *argp_program_version = "password-request 1.0";
129
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
104
131
105
/* Used for passing in values through the Avahi callback functions */
136
110
unsigned int dh_bits;
137
111
gnutls_dh_params_t dh_params;
138
112
const char *priority;
139
gpgme_ctx_t ctx;
140
113
} mandos_context;
141
114
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
150
115
/*
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* 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,
153
118
* "buffer_length" is how much is already used.
154
119
*/
155
size_t incbuffer(char **buffer, size_t buffer_length,
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
156
121
size_t buffer_capacity){
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
158
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
124
if (buffer == NULL){
160
125
return 0;
161
126
}
162
127
buffer_capacity += BUFFER_SIZE;
165
130
}
166
131
167
132
/*
168
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
169
135
*/
170
static bool init_gpgme(const char *seckey,
171
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;
172
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
173
146
gpgme_engine_info_t engine_info;
174
147
175
176
/*
177
* Helper function to insert pub and seckey to the engine keyring.
178
*/
179
bool import_key(const char *filename){
180
int ret;
181
int fd;
182
gpgme_data_t pgp_data;
183
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
if(fd == -1){
186
perror("open");
187
return false;
188
}
189
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
194
return false;
195
}
196
197
rc = gpgme_op_import(mc.ctx, pgp_data);
198
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
201
return false;
202
}
203
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
if(ret == -1){
206
perror("close");
207
}
208
gpgme_data_release(pgp_data);
209
return true;
210
}
211
212
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
214
150
}
215
151
216
152
/* Init GPGME */
217
153
gpgme_check_version(NULL);
218
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
if(rc != GPG_ERR_NO_ERROR){
155
if (rc != GPG_ERR_NO_ERROR){
220
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
157
gpgme_strsource(rc), gpgme_strerror(rc));
222
return false;
158
return -1;
223
159
}
224
160
225
/* Set GPGME home directory for the OpenPGP engine only */
226
rc = gpgme_get_engine_info(&engine_info);
227
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){
228
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
165
gpgme_strsource(rc), gpgme_strerror(rc));
230
return false;
166
return -1;
231
167
}
232
168
while(engine_info != NULL){
233
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
234
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
235
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
236
172
break;
237
173
}
238
174
engine_info = engine_info->next;
239
175
}
240
176
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
242
return false;
243
}
244
245
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
247
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
250
return false;
251
}
252
253
if(not import_key(pubkey) or not import_key(seckey)){
254
return false;
255
}
256
257
return true;
258
}
259
260
/*
261
* Decrypt OpenPGP data.
262
* Returns -1 on error
263
*/
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
size_t crypto_size,
266
char **plaintext){
267
gpgme_data_t dh_crypto, dh_plain;
268
gpgme_error_t rc;
269
ssize_t ret;
270
size_t plaintext_capacity = 0;
271
ssize_t plaintext_length = 0;
272
273
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
275
179
}
276
180
277
181
/* Create new GPGME data buffer from memory cryptotext */
278
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
183
0);
280
if(rc != GPG_ERR_NO_ERROR){
184
if (rc != GPG_ERR_NO_ERROR){
281
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
186
gpgme_strsource(rc), gpgme_strerror(rc));
283
187
return -1;
285
189
286
190
/* Create new empty GPGME data buffer for the plaintext */
287
191
rc = gpgme_data_new(&dh_plain);
288
if(rc != GPG_ERR_NO_ERROR){
192
if (rc != GPG_ERR_NO_ERROR){
289
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
194
gpgme_strsource(rc), gpgme_strerror(rc));
291
195
gpgme_data_release(dh_crypto);
292
196
return -1;
293
197
}
294
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
295
208
/* Decrypt data from the cryptotext data buffer to the plaintext
296
209
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
if(rc != GPG_ERR_NO_ERROR){
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
299
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
213
gpgme_strsource(rc), gpgme_strerror(rc));
301
214
plaintext_length = -1;
302
if(debug){
303
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
305
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
307
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
312
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
314
}
315
gpgme_recipient_t recipient;
316
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){
317
238
while(recipient != NULL){
318
239
fprintf(stderr, "Public key algorithm: %s\n",
319
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
325
246
}
326
247
}
327
248
}
328
goto decrypt_end;
329
}
330
331
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
333
249
}
334
250
335
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
338
254
plaintext_length = -1;
339
255
goto decrypt_end;
340
256
}
341
257
342
258
*plaintext = NULL;
343
259
while(true){
344
plaintext_capacity = incbuffer(plaintext,
260
plaintext_capacity = adjustbuffer(plaintext,
345
261
(size_t)plaintext_length,
346
262
plaintext_capacity);
347
if(plaintext_capacity == 0){
348
perror("incbuffer");
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
349
265
plaintext_length = -1;
350
266
goto decrypt_end;
351
267
}
353
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
354
270
BUFFER_SIZE);
355
271
/* Print the data, if any */
356
if(ret == 0){
272
if (ret == 0){
357
273
/* EOF */
358
274
break;
359
275
}
364
280
}
365
281
plaintext_length += ret;
366
282
}
367
283
368
284
if(debug){
369
285
fprintf(stderr, "Decrypted password is: ");
370
286
for(ssize_t i = 0; i < plaintext_length; i++){
383
299
return plaintext_length;
384
300
}
385
301
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
389
if(ret == NULL)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
390
305
ret = "(unknown)";
391
306
return ret;
392
307
}
397
312
fprintf(stderr, "GnuTLS: %s", string);
398
313
}
399
314
400
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
402
318
int ret;
403
319
404
320
if(debug){
406
322
}
407
323
408
324
ret = gnutls_global_init();
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
412
328
return -1;
413
329
}
414
330
415
if(debug){
331
if (debug){
416
332
/* "Use a log level over 10 to enable all debugging options."
417
333
* - GnuTLS manual
418
334
*/
421
337
}
422
338
423
339
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
425
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
431
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 ();
432
345
return -1;
433
346
}
434
347
435
348
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
439
352
}
440
353
441
354
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
443
GNUTLS_OPENPGP_FMT_BASE64);
444
if(ret != GNUTLS_E_SUCCESS){
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
445
357
fprintf(stderr,
446
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
449
361
safer_gnutls_strerror(ret));
450
362
goto globalfail;
451
363
}
452
364
453
365
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
458
goto globalfail;
459
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
464
goto globalfail;
465
}
466
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
468
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
469
381
return 0;
470
382
471
383
globalfail:
472
473
gnutls_certificate_free_credentials(mc.cred);
384
385
gnutls_certificate_free_credentials(mc->cred);
474
386
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
476
387
return -1;
388
477
389
}
478
390
479
static int init_gnutls_session(gnutls_session_t *session){
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
480
393
int ret;
481
394
/* GnuTLS session creation */
482
do {
483
ret = gnutls_init(session, GNUTLS_SERVER);
484
if(quit_now){
485
return -1;
486
}
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
if(ret != GNUTLS_E_SUCCESS){
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
489
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
398
safer_gnutls_strerror(ret));
491
399
}
492
400
493
401
{
494
402
const char *err;
495
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
if(quit_now){
498
gnutls_deinit(*session);
499
return -1;
500
}
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
if(ret != GNUTLS_E_SUCCESS){
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
503
405
fprintf(stderr, "Syntax error at: %s\n", err);
504
406
fprintf(stderr, "GnuTLS error: %s\n",
505
407
safer_gnutls_strerror(ret));
506
gnutls_deinit(*session);
408
gnutls_deinit (*session);
507
409
return -1;
508
410
}
509
411
}
510
412
511
do {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
514
if(quit_now){
515
gnutls_deinit(*session);
516
return -1;
517
}
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
if(ret != GNUTLS_E_SUCCESS){
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
520
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
417
safer_gnutls_strerror(ret));
522
gnutls_deinit(*session);
418
gnutls_deinit (*session);
523
419
return -1;
524
420
}
525
421
526
422
/* ignore client certificate if any. */
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
528
425
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
530
427
531
428
return 0;
532
429
}
538
435
/* Called when a Mandos server is found */
539
436
static int start_mandos_communication(const char *ip, uint16_t port,
540
437
AvahiIfIndex if_index,
541
int af){
542
int ret, tcp_sd = -1;
543
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
438
mandos_context *mc){
439
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
548
441
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
442
char *decrypted_buffer;
550
443
size_t buffer_length = 0;
551
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
552
446
size_t written;
553
int retval = -1;
447
int retval = 0;
448
char interface[IF_NAMESIZE];
554
449
gnutls_session_t session;
555
int pf; /* Protocol family */
556
557
errno = 0;
558
559
if(quit_now){
560
errno = EINTR;
561
return -1;
562
}
563
564
switch(af){
565
case AF_INET6:
566
pf = PF_INET6;
567
break;
568
case AF_INET:
569
pf = PF_INET;
570
break;
571
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
573
errno = EINVAL;
574
return -1;
575
}
576
577
ret = init_gnutls_session(&session);
578
if(ret != 0){
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
579
453
return -1;
580
454
}
581
455
582
456
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
584
458
"\n", ip, port);
585
459
}
586
460
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
if(tcp_sd < 0){
589
int e = errno;
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
590
463
perror("socket");
591
errno = e;
592
goto mandos_end;
593
}
594
595
if(quit_now){
596
errno = EINTR;
597
goto mandos_end;
598
}
599
600
memset(&to, 0, sizeof(to));
601
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
604
} else { /* IPv4 */
605
to.in.sin_family = (sa_family_t)af;
606
ret = inet_pton(af, ip, &to.in.sin_addr);
607
}
608
if(ret < 0 ){
609
int e = errno;
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 ){
610
481
perror("inet_pton");
611
errno = e;
612
goto mandos_end;
482
return -1;
613
483
}
614
484
if(ret == 0){
615
int e = errno;
616
485
fprintf(stderr, "Bad address: %s\n", ip);
617
errno = e;
618
goto mandos_end;
619
}
620
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
628
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
631
errno = EINVAL;
632
goto mandos_end;
633
}
634
/* Set the network interface number as scope */
635
to.in6.sin6_scope_id = (uint32_t)if_index;
636
}
637
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
641
}
486
return -1;
487
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
642
489
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
490
to.in6.sin6_scope_id = (uint32_t)if_index;
647
491
648
492
if(debug){
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
char interface[IF_NAMESIZE];
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
653
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
656
}
657
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
660
}
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
664
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
667
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
670
}
671
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){
672
498
perror("inet_ntop");
673
499
} else {
674
500
if(strcmp(addrstr, ip) != 0){
677
503
}
678
504
}
679
505
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
if(af == AF_INET6){
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
} else {
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
}
690
if(ret < 0){
691
int e = errno;
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
692
508
perror("connect");
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
700
}
701
509
return -1;
510
}
511
702
512
const char *out = mandos_protocol_version;
703
513
written = 0;
704
while(true){
514
while (true){
705
515
size_t out_size = strlen(out);
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
517
out_size - written));
708
if(ret == -1){
709
int e = errno;
518
if (ret == -1){
710
519
perror("write");
711
errno = e;
520
retval = -1;
712
521
goto mandos_end;
713
522
}
714
523
written += (size_t)ret;
715
524
if(written < out_size){
716
525
continue;
717
526
} else {
718
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
719
528
written = 0;
720
529
out = "\r\n";
721
530
} else {
722
531
break;
723
532
}
724
533
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
730
534
}
731
535
732
536
if(debug){
733
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
734
538
}
735
539
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
742
743
if(quit_now){
744
errno = EINTR;
745
goto mandos_end;
746
}
747
748
do {
749
ret = gnutls_handshake(session);
750
if(quit_now){
751
errno = EINTR;
752
goto mandos_end;
753
}
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
754
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
755
545
756
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
757
547
if(debug){
758
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
759
gnutls_perror(ret);
549
gnutls_perror (ret);
760
550
}
761
errno = EPROTO;
551
retval = -1;
762
552
goto mandos_end;
763
553
}
764
554
765
555
/* Read OpenPGP packet that contains the wanted password */
766
556
767
557
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
769
559
ip);
770
560
}
771
561
772
562
while(true){
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
779
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
780
564
buffer_capacity);
781
if(buffer_capacity == 0){
782
int e = errno;
783
perror("incbuffer");
784
errno = e;
785
goto mandos_end;
786
}
787
788
if(quit_now){
789
errno = EINTR;
790
goto mandos_end;
791
}
792
793
sret = gnutls_record_recv(session, buffer+buffer_length,
794
BUFFER_SIZE);
795
if(sret == 0){
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
567
retval = -1;
568
goto mandos_end;
569
}
570
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
796
574
break;
797
575
}
798
if(sret < 0){
799
switch(sret){
576
if (ret < 0){
577
switch(ret){
800
578
case GNUTLS_E_INTERRUPTED:
801
579
case GNUTLS_E_AGAIN:
802
580
break;
803
581
case GNUTLS_E_REHANDSHAKE:
804
do {
805
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
582
do{
583
ret = gnutls_handshake (session);
811
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
if(ret < 0){
585
if (ret < 0){
813
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
814
gnutls_perror(ret);
815
errno = EPROTO;
587
gnutls_perror (ret);
588
retval = -1;
816
589
goto mandos_end;
817
590
}
818
591
break;
819
592
default:
820
593
fprintf(stderr, "Unknown error while reading data from"
821
594
" encrypted session with Mandos server\n");
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
824
597
goto mandos_end;
825
598
}
826
599
} else {
827
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
828
601
}
829
602
}
830
603
832
605
fprintf(stderr, "Closing TLS session\n");
833
606
}
834
607
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
do {
841
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
847
848
if(buffer_length > 0){
849
ssize_t decrypted_buffer_size;
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
850
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
612
buffer_length,
852
&decrypted_buffer);
853
if(decrypted_buffer_size >= 0){
854
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
855
616
written = 0;
856
617
while(written < (size_t) decrypted_buffer_size){
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
862
ret = (int)fwrite(decrypted_buffer + written, 1,
863
(size_t)decrypted_buffer_size - written,
864
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
865
621
if(ret == 0 and ferror(stdout)){
866
int e = errno;
867
622
if(debug){
868
623
fprintf(stderr, "Error writing encrypted data: %s\n",
869
624
strerror(errno));
870
625
}
871
errno = e;
872
goto mandos_end;
626
retval = -1;
627
break;
873
628
}
874
629
written += (size_t)ret;
875
630
}
876
retval = 0;
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
877
634
}
878
635
}
879
636
880
637
/* Shutdown procedure */
881
638
882
639
mandos_end:
883
{
884
int e = errno;
885
free(decrypted_buffer);
886
free(buffer);
887
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
889
}
890
if(ret == -1){
891
if(e == 0){
892
e = errno;
893
}
894
perror("close");
895
}
896
gnutls_deinit(session);
897
if(quit_now){
898
e = EINTR;
899
retval = -1;
900
}
901
errno = e;
902
}
640
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
903
643
return retval;
904
644
}
905
645
906
646
static void resolve_callback(AvahiSServiceResolver *r,
907
647
AvahiIfIndex interface,
908
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
909
649
AvahiResolverEvent event,
910
650
const char *name,
911
651
const char *type,
916
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
658
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
921
662
922
663
/* Called whenever a service has been resolved successfully or
923
664
timed out */
924
665
925
if(quit_now){
926
return;
927
}
928
929
switch(event){
666
switch (event) {
930
667
default:
931
668
case AVAHI_RESOLVER_FAILURE:
932
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
935
672
break;
936
673
937
674
case AVAHI_RESOLVER_FOUND:
940
677
avahi_address_snprint(ip, sizeof(ip), address);
941
678
if(debug){
942
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
945
682
}
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
948
if(ret == 0){
949
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);
950
686
}
951
687
}
952
688
}
953
689
avahi_s_service_resolver_free(r);
954
690
}
955
691
956
static void browse_callback(AvahiSServiceBrowser *b,
957
AvahiIfIndex interface,
958
AvahiProtocol protocol,
959
AvahiBrowserEvent event,
960
const char *name,
961
const char *type,
962
const char *domain,
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
flags,
965
AVAHI_GCC_UNUSED void* userdata){
966
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 */
967
704
968
705
/* Called whenever a new services becomes available on the LAN or
969
706
is removed from the LAN */
970
707
971
if(quit_now){
972
return;
973
}
974
975
switch(event){
708
switch (event) {
976
709
default:
977
710
case AVAHI_BROWSER_FAILURE:
978
711
979
712
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
982
715
return;
983
716
984
717
case AVAHI_BROWSER_NEW:
987
720
the callback function is called the Avahi server will free the
988
721
resolver for us. */
989
722
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
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)))
993
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
728
name, avahi_strerror(avahi_server_errno(mc->server)));
995
729
break;
996
730
997
731
case AVAHI_BROWSER_REMOVE:
1006
740
}
1007
741
}
1008
742
1009
/* stop main loop after sigterm has been called */
1010
static void handle_sigterm(int sig){
1011
if(quit_now){
1012
return;
1013
}
1014
quit_now = 1;
1015
signal_received = sig;
1016
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
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;
1021
761
}
1022
762
763
1023
764
int main(int argc, char *argv[]){
1024
AvahiSServiceBrowser *sb = NULL;
1025
int error;
1026
int ret;
1027
intmax_t tmpmax;
1028
char *tmp;
1029
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1038
bool tempdir_created = false;
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
const char *seckey = PATHDIR "/" SECKEY;
1041
const char *pubkey = PATHDIR "/" PUBKEY;
1042
1043
bool gnutls_initialized = false;
1044
bool gpgme_initialized = false;
1045
float delay = 2.5f;
1046
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1049
1050
uid = getuid();
1051
gid = getgid();
1052
1053
/* Lower any group privileges we might have, just to be safe */
1054
errno = 0;
1055
ret = setgid(gid);
1056
if(ret == -1){
1057
perror("setgid");
1058
}
1059
1060
/* Lower user privileges (temporarily) */
1061
errno = 0;
1062
ret = seteuid(uid);
1063
if(ret == -1){
1064
perror("seteuid");
1065
}
1066
1067
if(quit_now){
1068
goto end;
1069
}
1070
1071
{
1072
struct argp_option options[] = {
1073
{ .name = "debug", .key = 128,
1074
.doc = "Debug mode", .group = 3 },
1075
{ .name = "connect", .key = 'c',
1076
.arg = "ADDRESS:PORT",
1077
.doc = "Connect directly to a specific Mandos server",
1078
.group = 1 },
1079
{ .name = "interface", .key = 'i',
1080
.arg = "NAME",
1081
.doc = "Network interface that will be used to search for"
1082
" Mandos servers",
1083
.group = 1 },
1084
{ .name = "seckey", .key = 's',
1085
.arg = "FILE",
1086
.doc = "OpenPGP secret key file base name",
1087
.group = 1 },
1088
{ .name = "pubkey", .key = 'p',
1089
.arg = "FILE",
1090
.doc = "OpenPGP public key file base name",
1091
.group = 2 },
1092
{ .name = "dh-bits", .key = 129,
1093
.arg = "BITS",
1094
.doc = "Bit length of the prime number used in the"
1095
" Diffie-Hellman key exchange",
1096
.group = 2 },
1097
{ .name = "priority", .key = 130,
1098
.arg = "STRING",
1099
.doc = "GnuTLS priority string for the TLS handshake",
1100
.group = 1 },
1101
{ .name = "delay", .key = 131,
1102
.arg = "SECONDS",
1103
.doc = "Maximum delay to wait for interface startup",
1104
.group = 2 },
1105
/*
1106
* These reproduce what we would get without ARGP_NO_HELP
1107
*/
1108
{ .name = "help", .key = '?',
1109
.doc = "Give this help list", .group = -1 },
1110
{ .name = "usage", .key = -3,
1111
.doc = "Give a short usage message", .group = -1 },
1112
{ .name = "version", .key = 'V',
1113
.doc = "Print program version", .group = -1 },
1114
{ .name = NULL }
1115
};
1116
1117
error_t parse_opt(int key, char *arg,
1118
struct argp_state *state){
1119
errno = 0;
1120
switch(key){
1121
case 128: /* --debug */
1122
debug = true;
1123
break;
1124
case 'c': /* --connect */
1125
connect_to = arg;
1126
break;
1127
case 'i': /* --interface */
1128
interface = arg;
1129
break;
1130
case 's': /* --seckey */
1131
seckey = arg;
1132
break;
1133
case 'p': /* --pubkey */
1134
pubkey = arg;
1135
break;
1136
case 129: /* --dh-bits */
1137
errno = 0;
1138
tmpmax = strtoimax(arg, &tmp, 10);
1139
if(errno != 0 or tmp == arg or *tmp != '\0'
1140
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1141
argp_error(state, "Bad number of DH bits");
1142
}
1143
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
break;
1145
case 130: /* --priority */
1146
mc.priority = arg;
1147
break;
1148
case 131: /* --delay */
1149
errno = 0;
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
argp_error(state, "Bad delay");
1153
}
1154
break;
1155
/*
1156
* These reproduce what we would get without ARGP_NO_HELP
1157
*/
1158
case '?': /* --help */
1159
argp_state_help(state, state->out_stream,
1160
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1161
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1162
case -3: /* --usage */
1163
argp_state_help(state, state->out_stream,
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
exit(argp_err_exit_status);
1168
break;
1169
default:
1170
return ARGP_ERR_UNKNOWN;
1171
}
1172
return errno;
1173
}
1174
1175
struct argp argp = { .options = options, .parser = parse_opt,
1176
.args_doc = "",
1177
.doc = "Mandos client -- Get and decrypt"
1178
" passwords from a Mandos server" };
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
1182
case 0:
1183
break;
1184
case ENOMEM:
1185
default:
1186
errno = ret;
1187
perror("argp_parse");
1188
exitcode = EX_OSERR;
1189
goto end;
1190
case EINVAL:
1191
exitcode = EX_USAGE;
1192
goto end;
1193
}
1194
}
1195
1196
if(not debug){
1197
avahi_set_log_function(empty_log);
1198
}
1199
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
from the signal handler */
1202
/* Initialize the pseudo-RNG for Avahi */
1203
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1207
exitcode = EX_UNAVAILABLE;
1208
goto end;
1209
}
1210
1211
sigemptyset(&sigterm_action.sa_mask);
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
if(ret == -1){
1214
perror("sigaddset");
1215
exitcode = EX_OSERR;
1216
goto end;
1217
}
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
if(ret == -1){
1220
perror("sigaddset");
1221
exitcode = EX_OSERR;
1222
goto end;
1223
}
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
if(ret == -1){
1226
perror("sigaddset");
1227
exitcode = EX_OSERR;
1228
goto end;
1229
}
1230
/* Need to check if the handler is SIG_IGN before handling:
1231
| [[info:libc:Initial Signal Actions]] |
1232
| [[info:libc:Basic Signal Handling]] |
1233
*/
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
if(ret == -1){
1236
perror("sigaction");
1237
return EX_OSERR;
1238
}
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
if(ret == -1){
1242
perror("sigaction");
1243
exitcode = EX_OSERR;
1244
goto end;
1245
}
1246
}
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
if(ret == -1){
1249
perror("sigaction");
1250
return EX_OSERR;
1251
}
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
if(ret == -1){
1255
perror("sigaction");
1256
exitcode = EX_OSERR;
1257
goto end;
1258
}
1259
}
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
if(ret == -1){
1262
perror("sigaction");
1263
return EX_OSERR;
1264
}
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
1274
/* If the interface is down, bring it up */
1275
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
1276
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
937
if(if_index == 0){
1278
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
1416
}
1417
1418
if(quit_now){
1419
goto end;
1420
}
1421
1422
ret = init_gnutls_global(pubkey, seckey);
1423
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
1425
exitcode = EX_UNAVAILABLE;
1426
goto end;
1427
} else {
1428
gnutls_initialized = true;
1429
}
1430
1431
if(quit_now){
1432
goto end;
1433
}
1434
1435
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
1442
if(quit_now){
1443
goto end;
1444
}
1445
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
1448
exitcode = EX_UNAVAILABLE;
1449
goto end;
1450
} else {
1451
gpgme_initialized = true;
1452
}
1453
1454
if(quit_now){
1455
goto end;
1456
}
1457
1458
if(connect_to != NULL){
1459
/* Connect directly, do not use Zeroconf */
1460
/* (Mainly meant for debugging) */
1461
char *address = strrchr(connect_to, ':');
1462
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
1464
exitcode = EX_USAGE;
1465
goto end;
1466
}
1467
1468
if(quit_now){
1469
goto end;
1470
}
1471
1472
uint16_t port;
1473
errno = 0;
1474
tmpmax = strtoimax(address+1, &tmp, 10);
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
1478
exitcode = EX_USAGE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1486
port = (uint16_t)tmpmax;
1487
*address = '\0';
1488
address = connect_to;
1489
/* Colon in address indicates IPv6 */
1490
int af;
1491
if(strchr(address, ':') != NULL){
1492
af = AF_INET6;
1493
} else {
1494
af = AF_INET;
1495
}
1496
1497
if(quit_now){
1498
goto end;
1499
}
1500
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
1523
exitcode = EXIT_SUCCESS;
1524
}
1525
goto end;
1526
}
1527
1528
if(quit_now){
1529
goto end;
1530
}
1531
1532
{
1533
AvahiServerConfig config;
1534
/* Do not publish any local Zeroconf records */
1535
avahi_server_config_init(&config);
1536
config.publish_hinfo = 0;
1537
config.publish_addresses = 0;
1538
config.publish_workstation = 0;
1539
config.publish_domain = 0;
1540
1541
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
1545
1546
/* Free the Avahi configuration data */
1547
avahi_server_config_free(&config);
1548
}
1549
1550
/* Check if creating the Avahi server object succeeded */
1551
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
1554
exitcode = EX_UNAVAILABLE;
1555
goto end;
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
1561
1562
/* Create the Avahi service browser */
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
1566
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
}
1572
1573
if(quit_now){
1574
goto end;
1575
}
1576
1577
/* Run the main loop */
1578
1579
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
1584
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
1585
1031
end:
1586
1587
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
1589
}
1590
1591
/* Cleanup things */
1592
if(sb != NULL)
1593
avahi_s_service_browser_free(sb);
1594
1595
if(mc.server != NULL)
1596
avahi_server_free(mc.server);
1597
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
1600
1601
if(gnutls_initialized){
1602
gnutls_certificate_free_credentials(mc.cred);
1603
gnutls_global_deinit();
1604
gnutls_dh_params_deinit(mc.dh_params);
1605
}
1606
1607
if(gpgme_initialized){
1608
gpgme_release(mc.ctx);
1609
}
1610
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
/* Removes the temp directory used by GPGME */
1644
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
1665
char *fullname = NULL;
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
direntry->d_name);
1668
if(ret < 0){
1669
perror("asprintf");
1670
continue;
1671
}
1672
ret = remove(fullname);
1673
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
1676
}
1677
free(fullname);
1678
}
1679
closedir(d);
1680
}
1681
ret = rmdir(tempdir);
1682
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
1684
}
1685
}
1686
1687
if(quit_now){
1688
sigemptyset(&old_sigterm_action.sa_mask);
1689
old_sigterm_action.sa_handler = SIG_DFL;
1690
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1691
&old_sigterm_action,
1692
NULL));
1693
if(ret == -1){
1694
perror("sigaction");
1695
}
1696
do {
1697
ret = raise(signal_received);
1698
} while(ret != 0 and errno == EINTR);
1699
if(ret != 0){
1700
perror("raise");
1701
abort();
1702
}
1703
TEMP_FAILURE_RETRY(pause());
1704
}
1705
1706
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;
1707
1055
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0