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237.2.176
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-12-27 03:35:58 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20091227033558-y57wv1u4cls3i8kq
TODO file changes.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#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 */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#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() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
44
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
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
92
/* Avahi */
93
/* All Avahi types, constants and functions
94
Avahi*, avahi_*,
95
AVAHI_* */
47
96
#include <avahi-core/core.h>
48
97
#include <avahi-core/lookup.h>
49
98
#include <avahi-core/log.h>
51
100
#include <avahi-common/malloc.h>
52
101
#include <avahi-common/error.h>
53
102
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
103
/* GnuTLS */
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
functions:
106
gnutls_*
107
init_gnutls_session(),
108
GNUTLS_* */
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
60
112
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
113
/* GPGME */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
116
gpgme_*
117
GPGME_PROTOCOL_OpenPGP,
118
GPG_ERR_NO_* */
74
119
75
120
#define BUFFER_SIZE 256
76
121
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
125
77
126
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
127
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
80
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
static const char mandos_protocol_version[] = "1";
82
130
83
131
/* Used for passing in values through the Avahi callback functions */
84
132
typedef struct {
88
136
unsigned int dh_bits;
89
137
gnutls_dh_params_t dh_params;
90
138
const char *priority;
139
gpgme_ctx_t ctx;
91
140
} mandos_context;
92
141
93
/* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
94
* "buffer_capacity" is how much is currently allocated,
95
* "buffer_length" is how much is already used. */
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
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
/*
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
153
* "buffer_length" is how much is already used.
154
*/
155
size_t incbuffer(char **buffer, size_t buffer_length,
97
156
size_t buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
99
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
100
if (buffer == NULL){
159
if(buffer == NULL){
101
160
return 0;
102
161
}
103
162
buffer_capacity += BUFFER_SIZE;
106
165
}
107
166
108
167
/*
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
168
* Initialize GPGME.
111
169
*/
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
116
gpgme_data_t dh_crypto, dh_plain;
117
gpgme_ctx_t ctx;
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
118
172
gpgme_error_t rc;
119
ssize_t ret;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
122
173
gpgme_engine_info_t engine_info;
123
174
124
if (debug){
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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");
126
214
}
127
215
128
216
/* Init GPGME */
129
217
gpgme_check_version(NULL);
130
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
131
if (rc != GPG_ERR_NO_ERROR){
219
if(rc != GPG_ERR_NO_ERROR){
132
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
133
221
gpgme_strsource(rc), gpgme_strerror(rc));
134
return -1;
222
return false;
135
223
}
136
224
137
/* Set GPGME home directory for the OpenPGP engine only */
138
rc = gpgme_get_engine_info (&engine_info);
139
if (rc != GPG_ERR_NO_ERROR){
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){
140
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
141
229
gpgme_strsource(rc), gpgme_strerror(rc));
142
return -1;
230
return false;
143
231
}
144
232
while(engine_info != NULL){
145
233
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
146
234
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
147
engine_info->file_name, homedir);
235
engine_info->file_name, tempdir);
148
236
break;
149
237
}
150
238
engine_info = engine_info->next;
151
239
}
152
240
if(engine_info == NULL){
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
154
return -1;
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");
155
275
}
156
276
157
277
/* Create new GPGME data buffer from memory cryptotext */
158
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
159
279
0);
160
if (rc != GPG_ERR_NO_ERROR){
280
if(rc != GPG_ERR_NO_ERROR){
161
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
162
282
gpgme_strsource(rc), gpgme_strerror(rc));
163
283
return -1;
165
285
166
286
/* Create new empty GPGME data buffer for the plaintext */
167
287
rc = gpgme_data_new(&dh_plain);
168
if (rc != GPG_ERR_NO_ERROR){
288
if(rc != GPG_ERR_NO_ERROR){
169
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
170
290
gpgme_strsource(rc), gpgme_strerror(rc));
171
291
gpgme_data_release(dh_crypto);
172
292
return -1;
173
293
}
174
294
175
/* Create new GPGME "context" */
176
rc = gpgme_new(&ctx);
177
if (rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
plaintext_length = -1;
181
goto decrypt_end;
182
}
183
184
295
/* Decrypt data from the cryptotext data buffer to the plaintext
185
296
data buffer */
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
187
if (rc != GPG_ERR_NO_ERROR){
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
if(rc != GPG_ERR_NO_ERROR){
188
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
189
300
gpgme_strsource(rc), gpgme_strerror(rc));
190
301
plaintext_length = -1;
191
goto decrypt_end;
192
}
193
194
if(debug){
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
}
197
198
if (debug){
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
201
if (result == NULL){
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
} else {
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
210
}
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
213
if(recipient){
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;
214
317
while(recipient != NULL){
215
318
fprintf(stderr, "Public key algorithm: %s\n",
216
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
222
325
}
223
326
}
224
327
}
328
goto decrypt_end;
329
}
330
331
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
225
333
}
226
334
227
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
perror("pgpme_data_seek");
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
230
338
plaintext_length = -1;
231
339
goto decrypt_end;
232
340
}
233
341
234
342
*plaintext = NULL;
235
343
while(true){
236
plaintext_capacity = adjustbuffer(plaintext,
344
plaintext_capacity = incbuffer(plaintext,
237
345
(size_t)plaintext_length,
238
346
plaintext_capacity);
239
if (plaintext_capacity == 0){
240
perror("adjustbuffer");
347
if(plaintext_capacity == 0){
348
perror("incbuffer");
241
349
plaintext_length = -1;
242
350
goto decrypt_end;
243
351
}
245
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
246
354
BUFFER_SIZE);
247
355
/* Print the data, if any */
248
if (ret == 0){
356
if(ret == 0){
249
357
/* EOF */
250
358
break;
251
359
}
256
364
}
257
365
plaintext_length += ret;
258
366
}
259
367
260
368
if(debug){
261
369
fprintf(stderr, "Decrypted password is: ");
262
370
for(ssize_t i = 0; i < plaintext_length; i++){
275
383
return plaintext_length;
276
384
}
277
385
278
static const char * safer_gnutls_strerror (int value) {
279
const char *ret = gnutls_strerror (value);
280
if (ret == NULL)
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)
281
390
ret = "(unknown)";
282
391
return ret;
283
392
}
288
397
fprintf(stderr, "GnuTLS: %s", string);
289
398
}
290
399
291
static int init_gnutls_global(mandos_context *mc,
292
const char *pubkeyfile,
293
const char *seckeyfile){
400
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
294
402
int ret;
295
403
296
404
if(debug){
297
405
fprintf(stderr, "Initializing GnuTLS\n");
298
406
}
299
300
if ((ret = gnutls_global_init ())
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "GnuTLS global_init: %s\n",
303
safer_gnutls_strerror(ret));
407
408
ret = gnutls_global_init();
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
304
412
return -1;
305
413
}
306
414
307
if (debug){
415
if(debug){
308
416
/* "Use a log level over 10 to enable all debugging options."
309
417
* - GnuTLS manual
310
418
*/
313
421
}
314
422
315
423
/* OpenPGP credentials */
316
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
317
!= GNUTLS_E_SUCCESS) {
318
fprintf (stderr, "GnuTLS memory error: %s\n",
319
safer_gnutls_strerror(ret));
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();
320
432
return -1;
321
433
}
322
434
323
435
if(debug){
324
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
326
seckeyfile);
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
327
439
}
328
440
329
441
ret = gnutls_certificate_set_openpgp_key_file
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
331
if (ret != GNUTLS_E_SUCCESS) {
442
(mc.cred, pubkeyfilename, seckeyfilename,
443
GNUTLS_OPENPGP_FMT_BASE64);
444
if(ret != GNUTLS_E_SUCCESS){
332
445
fprintf(stderr,
333
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
334
" '%s')\n", ret, pubkeyfile, seckeyfile);
335
fprintf(stdout, "The GnuTLS error is: %s\n",
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
336
449
safer_gnutls_strerror(ret));
337
return -1;
450
goto globalfail;
338
451
}
339
452
340
453
/* GnuTLS server initialization */
341
ret = gnutls_dh_params_init(&mc->dh_params);
342
if (ret != GNUTLS_E_SUCCESS) {
343
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
344
" %s\n", safer_gnutls_strerror(ret));
345
return -1;
346
}
347
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
348
if (ret != GNUTLS_E_SUCCESS) {
349
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
350
safer_gnutls_strerror(ret));
351
return -1;
352
}
353
354
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
355
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
356
469
return 0;
470
471
globalfail:
472
473
gnutls_certificate_free_credentials(mc.cred);
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
476
return -1;
357
477
}
358
478
359
static int init_gnutls_session(mandos_context *mc,
360
gnutls_session_t *session){
479
static int init_gnutls_session(gnutls_session_t *session){
361
480
int ret;
362
481
/* GnuTLS session creation */
363
ret = gnutls_init(session, GNUTLS_SERVER);
364
if (ret != GNUTLS_E_SUCCESS){
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){
365
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
366
490
safer_gnutls_strerror(ret));
367
491
}
368
492
369
493
{
370
494
const char *err;
371
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
372
if (ret != GNUTLS_E_SUCCESS) {
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){
373
503
fprintf(stderr, "Syntax error at: %s\n", err);
374
504
fprintf(stderr, "GnuTLS error: %s\n",
375
505
safer_gnutls_strerror(ret));
506
gnutls_deinit(*session);
376
507
return -1;
377
508
}
378
509
}
379
510
380
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
381
mc->cred);
382
if (ret != GNUTLS_E_SUCCESS) {
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){
383
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
384
521
safer_gnutls_strerror(ret));
522
gnutls_deinit(*session);
385
523
return -1;
386
524
}
387
525
388
526
/* ignore client certificate if any. */
389
gnutls_certificate_server_set_request (*session,
390
GNUTLS_CERT_IGNORE);
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
391
528
392
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
393
530
394
531
return 0;
395
532
}
401
538
/* Called when a Mandos server is found */
402
539
static int start_mandos_communication(const char *ip, uint16_t port,
403
540
AvahiIfIndex if_index,
404
mandos_context *mc){
405
int ret, tcp_sd;
406
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
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;
407
548
char *buffer = NULL;
408
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
409
550
size_t buffer_length = 0;
410
551
size_t buffer_capacity = 0;
411
ssize_t decrypted_buffer_size;
412
552
size_t written;
413
int retval = 0;
414
char interface[IF_NAMESIZE];
553
int retval = -1;
415
554
gnutls_session_t session;
416
417
ret = init_gnutls_session (mc, &session);
418
if (ret != 0){
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){
419
579
return -1;
420
580
}
421
581
422
582
if(debug){
423
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
424
ip, port);
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
425
585
}
426
586
427
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
428
if(tcp_sd < 0) {
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
if(tcp_sd < 0){
589
int e = errno;
429
590
perror("socket");
430
return -1;
431
}
432
433
if(debug){
434
if(if_indextoname((unsigned int)if_index, interface) == NULL){
435
perror("if_indextoname");
436
return -1;
437
}
438
fprintf(stderr, "Binding to interface %s\n", interface);
439
}
440
441
memset(&to,0,sizeof(to)); /* Spurious warning */
442
to.in6.sin6_family = AF_INET6;
443
/* It would be nice to have a way to detect if we were passed an
444
IPv4 address here. Now we assume an IPv6 address. */
445
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
446
if (ret < 0 ){
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;
447
610
perror("inet_pton");
448
return -1;
611
errno = e;
612
goto mandos_end;
449
613
}
450
614
if(ret == 0){
615
int e = errno;
451
616
fprintf(stderr, "Bad address: %s\n", ip);
452
return -1;
453
}
454
to.in6.sin6_port = htons(port); /* Spurious warning */
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
}
455
642
456
to.in6.sin6_scope_id = (uint32_t)if_index;
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
457
647
458
648
if(debug){
459
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
460
char addrstr[INET6_ADDRSTRLEN] = "";
461
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
462
sizeof(addrstr)) == NULL){
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){
463
672
perror("inet_ntop");
464
673
} else {
465
674
if(strcmp(addrstr, ip) != 0){
468
677
}
469
678
}
470
679
471
ret = connect(tcp_sd, &to.in, sizeof(to));
472
if (ret < 0){
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;
473
692
perror("connect");
474
return -1;
475
}
476
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
700
}
701
477
702
const char *out = mandos_protocol_version;
478
703
written = 0;
479
while (true){
704
while(true){
480
705
size_t out_size = strlen(out);
481
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
482
707
out_size - written));
483
if (ret == -1){
708
if(ret == -1){
709
int e = errno;
484
710
perror("write");
485
retval = -1;
711
errno = e;
486
712
goto mandos_end;
487
713
}
488
714
written += (size_t)ret;
489
715
if(written < out_size){
490
716
continue;
491
717
} else {
492
if (out == mandos_protocol_version){
718
if(out == mandos_protocol_version){
493
719
written = 0;
494
720
out = "\r\n";
495
721
} else {
496
722
break;
497
723
}
498
724
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
499
730
}
500
731
501
732
if(debug){
502
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
503
734
}
504
735
505
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
506
507
ret = gnutls_handshake (session);
508
509
if (ret != GNUTLS_E_SUCCESS){
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
}
754
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
755
756
if(ret != GNUTLS_E_SUCCESS){
510
757
if(debug){
511
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
512
gnutls_perror (ret);
759
gnutls_perror(ret);
513
760
}
514
retval = -1;
761
errno = EPROTO;
515
762
goto mandos_end;
516
763
}
517
764
518
765
/* Read OpenPGP packet that contains the wanted password */
519
766
520
767
if(debug){
521
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
522
769
ip);
523
770
}
524
771
525
772
while(true){
526
buffer_capacity = adjustbuffer(&buffer, buffer_length,
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
779
buffer_capacity = incbuffer(&buffer, buffer_length,
527
780
buffer_capacity);
528
if (buffer_capacity == 0){
529
perror("adjustbuffer");
530
retval = -1;
531
goto mandos_end;
532
}
533
534
ret = gnutls_record_recv(session, buffer+buffer_length,
535
BUFFER_SIZE);
536
if (ret == 0){
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){
537
796
break;
538
797
}
539
if (ret < 0){
540
switch(ret){
798
if(sret < 0){
799
switch(sret){
541
800
case GNUTLS_E_INTERRUPTED:
542
801
case GNUTLS_E_AGAIN:
543
802
break;
544
803
case GNUTLS_E_REHANDSHAKE:
545
ret = gnutls_handshake (session);
546
if (ret < 0){
804
do {
805
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
if(ret < 0){
547
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
548
gnutls_perror (ret);
549
retval = -1;
814
gnutls_perror(ret);
815
errno = EPROTO;
550
816
goto mandos_end;
551
817
}
552
818
break;
553
819
default:
554
820
fprintf(stderr, "Unknown error while reading data from"
555
821
" encrypted session with Mandos server\n");
556
retval = -1;
557
gnutls_bye (session, GNUTLS_SHUT_RDWR);
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
558
824
goto mandos_end;
559
825
}
560
826
} else {
561
buffer_length += (size_t) ret;
827
buffer_length += (size_t) sret;
562
828
}
563
829
}
564
830
566
832
fprintf(stderr, "Closing TLS session\n");
567
833
}
568
834
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
571
if (buffer_length > 0){
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;
572
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
573
851
buffer_length,
574
&decrypted_buffer,
575
keydir);
576
if (decrypted_buffer_size >= 0){
852
&decrypted_buffer);
853
if(decrypted_buffer_size >= 0){
854
577
855
written = 0;
578
856
while(written < (size_t) decrypted_buffer_size){
579
ret = (int)fwrite (decrypted_buffer + written, 1,
580
(size_t)decrypted_buffer_size - written,
581
stdout);
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);
582
865
if(ret == 0 and ferror(stdout)){
866
int e = errno;
583
867
if(debug){
584
868
fprintf(stderr, "Error writing encrypted data: %s\n",
585
869
strerror(errno));
586
870
}
587
retval = -1;
588
break;
871
errno = e;
872
goto mandos_end;
589
873
}
590
874
written += (size_t)ret;
591
875
}
592
free(decrypted_buffer);
593
} else {
594
retval = -1;
876
retval = 0;
595
877
}
596
878
}
597
879
598
880
/* Shutdown procedure */
599
881
600
882
mandos_end:
601
free(buffer);
602
close(tcp_sd);
603
gnutls_deinit (session);
604
gnutls_certificate_free_credentials (mc->cred);
605
gnutls_global_deinit ();
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
}
606
903
return retval;
607
904
}
608
905
609
906
static void resolve_callback(AvahiSServiceResolver *r,
610
907
AvahiIfIndex interface,
611
AVAHI_GCC_UNUSED AvahiProtocol protocol,
908
AvahiProtocol proto,
612
909
AvahiResolverEvent event,
613
910
const char *name,
614
911
const char *type,
619
916
AVAHI_GCC_UNUSED AvahiStringList *txt,
620
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
621
918
flags,
622
void* userdata) {
623
mandos_context *mc = userdata;
624
assert(r); /* Spurious warning */
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
625
921
626
922
/* Called whenever a service has been resolved successfully or
627
923
timed out */
628
924
629
switch (event) {
925
if(quit_now){
926
return;
927
}
928
929
switch(event){
630
930
default:
631
931
case AVAHI_RESOLVER_FAILURE:
632
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
633
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
634
avahi_strerror(avahi_server_errno(mc->server)));
934
avahi_strerror(avahi_server_errno(mc.server)));
635
935
break;
636
936
637
937
case AVAHI_RESOLVER_FOUND:
639
939
char ip[AVAHI_ADDRESS_STR_MAX];
640
940
avahi_address_snprint(ip, sizeof(ip), address);
641
941
if(debug){
642
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
643
" port %d\n", name, host_name, ip, interface, port);
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
644
945
}
645
int ret = start_mandos_communication(ip, port, interface, mc);
646
if (ret == 0){
647
exit(EXIT_SUCCESS);
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);
648
950
}
649
951
}
650
952
}
651
953
avahi_s_service_resolver_free(r);
652
954
}
653
955
654
static void browse_callback( AvahiSServiceBrowser *b,
655
AvahiIfIndex interface,
656
AvahiProtocol protocol,
657
AvahiBrowserEvent event,
658
const char *name,
659
const char *type,
660
const char *domain,
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
665
assert(b); /* Spurious warning */
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);
666
967
667
968
/* Called whenever a new services becomes available on the LAN or
668
969
is removed from the LAN */
669
970
670
switch (event) {
971
if(quit_now){
972
return;
973
}
974
975
switch(event){
671
976
default:
672
977
case AVAHI_BROWSER_FAILURE:
673
978
674
979
fprintf(stderr, "(Avahi browser) %s\n",
675
avahi_strerror(avahi_server_errno(mc->server)));
676
avahi_simple_poll_quit(mc->simple_poll);
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
677
982
return;
678
983
679
984
case AVAHI_BROWSER_NEW:
682
987
the callback function is called the Avahi server will free the
683
988
resolver for us. */
684
989
685
if (!(avahi_s_service_resolver_new(mc->server, interface,
686
protocol, name, type, domain,
687
AVAHI_PROTO_INET6, 0,
688
resolve_callback, mc)))
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
689
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
690
name, avahi_strerror(avahi_server_errno(mc->server)));
994
name, avahi_strerror(avahi_server_errno(mc.server)));
691
995
break;
692
996
693
997
case AVAHI_BROWSER_REMOVE:
702
1006
}
703
1007
}
704
1008
705
/* Combines file name and path and returns the malloced new
706
string. some sane checks could/should be added */
707
static const char *combinepath(const char *first, const char *second){
708
size_t f_len = strlen(first);
709
size_t s_len = strlen(second);
710
char *tmp = malloc(f_len + s_len + 2);
711
if (tmp == NULL){
712
return NULL;
713
}
714
if(f_len > 0){
715
memcpy(tmp, first, f_len); /* Spurious warning */
716
}
717
tmp[f_len] = '/';
718
if(s_len > 0){
719
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
720
}
721
tmp[f_len + 1 + s_len] = '\0';
722
return tmp;
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;
723
1021
}
724
1022
725
726
1023
int main(int argc, char *argv[]){
727
AvahiSServiceBrowser *sb = NULL;
728
int error;
729
int ret;
730
int exitcode = EXIT_SUCCESS;
731
const char *interface = "eth0";
732
struct ifreq network;
733
int sd;
734
uid_t uid;
735
gid_t gid;
736
char *connect_to = NULL;
737
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
const char *pubkeyfile = "pubkey.txt";
739
const char *seckeyfile = "seckey.txt";
740
mandos_context mc = { .simple_poll = NULL, .server = NULL,
741
.dh_bits = 1024, .priority = "SECURE256"};
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
};
742
1116
743
{
744
struct argp_option options[] = {
745
{ .name = "debug", .key = 128,
746
.doc = "Debug mode", .group = 3 },
747
{ .name = "connect", .key = 'c',
748
.arg = "IP",
749
.doc = "Connect directly to a sepcified mandos server",
750
.group = 1 },
751
{ .name = "interface", .key = 'i',
752
.arg = "INTERFACE",
753
.doc = "Interface that Avahi will conntect through",
754
.group = 1 },
755
{ .name = "keydir", .key = 'd',
756
.arg = "KEYDIR",
757
.doc = "Directory where the openpgp keyring is",
758
.group = 1 },
759
{ .name = "seckey", .key = 's',
760
.arg = "SECKEY",
761
.doc = "Secret openpgp key for gnutls authentication",
762
.group = 1 },
763
{ .name = "pubkey", .key = 'p',
764
.arg = "PUBKEY",
765
.doc = "Public openpgp key for gnutls authentication",
766
.group = 2 },
767
{ .name = "dh-bits", .key = 129,
768
.arg = "BITS",
769
.doc = "dh-bits to use in gnutls communication",
770
.group = 2 },
771
{ .name = "priority", .key = 130,
772
.arg = "PRIORITY",
773
.doc = "GNUTLS priority", .group = 1 },
774
{ .name = NULL }
775
};
776
777
778
error_t parse_opt (int key, char *arg,
779
struct argp_state *state) {
780
/* Get the INPUT argument from `argp_parse', which we know is
781
a pointer to our plugin list pointer. */
782
switch (key) {
783
case 128:
784
debug = true;
785
break;
786
case 'c':
787
connect_to = arg;
788
break;
789
case 'i':
790
interface = arg;
791
break;
792
case 'd':
793
keydir = arg;
794
break;
795
case 's':
796
seckeyfile = arg;
797
break;
798
case 'p':
799
pubkeyfile = arg;
800
break;
801
case 129:
802
errno = 0;
803
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
804
if (errno){
805
perror("strtol");
806
exit(EXIT_FAILURE);
807
}
808
break;
809
case 130:
810
mc.priority = arg;
811
break;
812
case ARGP_KEY_ARG:
813
argp_usage (state);
814
break;
815
case ARGP_KEY_END:
816
break;
817
default:
818
return ARGP_ERR_UNKNOWN;
819
}
820
return 0;
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;
821
1171
}
822
823
struct argp argp = { .options = options, .parser = parse_opt,
824
.args_doc = "",
825
.doc = "Mandos client -- Get and decrypt"
826
" passwords from mandos server" };
827
argp_parse (&argp, argc, argv, 0, 0, NULL);
828
}
829
830
pubkeyfile = combinepath(keydir, pubkeyfile);
831
if (pubkeyfile == NULL){
832
perror("combinepath");
833
exitcode = EXIT_FAILURE;
834
goto end;
835
}
836
837
seckeyfile = combinepath(keydir, seckeyfile);
838
if (seckeyfile == NULL){
839
perror("combinepath");
840
goto end;
841
}
842
843
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
844
if (ret == -1){
845
fprintf(stderr, "init_gnutls_global\n");
846
goto end;
847
}
848
849
uid = getuid();
850
gid = getgid();
851
852
ret = setuid(uid);
853
if (ret == -1){
854
perror("setuid");
855
}
856
857
setgid(gid);
858
if (ret == -1){
859
perror("setgid");
860
}
861
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'){
862
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
863
1277
if(if_index == 0){
864
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
865
exit(EXIT_FAILURE);
866
}
867
868
if(connect_to != NULL){
869
/* Connect directly, do not use Zeroconf */
870
/* (Mainly meant for debugging) */
871
char *address = strrchr(connect_to, ':');
872
if(address == NULL){
873
fprintf(stderr, "No colon in address\n");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
errno = 0;
878
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
879
if(errno){
880
perror("Bad port number");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
*address = '\0';
885
address = connect_to;
886
ret = start_mandos_communication(address, port, if_index, &mc);
887
if(ret < 0){
888
exitcode = EXIT_FAILURE;
889
} else {
890
exitcode = EXIT_SUCCESS;
891
}
892
goto end;
893
}
894
895
/* If the interface is down, bring it up */
896
{
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
if(sd < 0) {
899
perror("socket");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
strcpy(network.ifr_name, interface); /* Spurious warning */
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
if(ret == -1){
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
908
goto end;
909
}
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
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
1585
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 */
912
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
1626
if(ret == -1){
914
1627
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
close(sd);
920
}
921
922
if (not debug){
923
avahi_set_log_function(empty_log);
924
}
925
926
/* Initialize the pseudo-RNG for Avahi */
927
srand((unsigned int) time(NULL));
928
929
/* Allocate main Avahi loop object */
930
mc.simple_poll = avahi_simple_poll_new();
931
if (mc.simple_poll == NULL) {
932
fprintf(stderr, "Avahi: Failed to create simple poll"
933
" object.\n");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
938
{
939
AvahiServerConfig config;
940
/* Do not publish any local Zeroconf records */
941
avahi_server_config_init(&config);
942
config.publish_hinfo = 0;
943
config.publish_addresses = 0;
944
config.publish_workstation = 0;
945
config.publish_domain = 0;
946
947
/* Allocate a new server */
948
mc.server = avahi_server_new(avahi_simple_poll_get
949
(mc.simple_poll), &config, NULL,
950
NULL, &error);
951
952
/* Free the Avahi configuration data */
953
avahi_server_config_free(&config);
954
}
955
956
/* Check if creating the Avahi server object succeeded */
957
if (mc.server == NULL) {
958
fprintf(stderr, "Failed to create Avahi server: %s\n",
959
avahi_strerror(error));
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
964
/* Create the Avahi service browser */
965
sb = avahi_s_service_browser_new(mc.server, if_index,
966
AVAHI_PROTO_INET6,
967
"_mandos._tcp", NULL, 0,
968
browse_callback, &mc);
969
if (sb == NULL) {
970
fprintf(stderr, "Failed to create service browser: %s\n",
971
avahi_strerror(avahi_server_errno(mc.server)));
972
exitcode = EXIT_FAILURE;
973
goto end;
974
}
975
976
/* Run the main loop */
977
978
if (debug){
979
fprintf(stderr, "Starting Avahi loop search\n");
980
}
981
982
avahi_simple_poll_loop(mc.simple_poll);
983
984
end:
985
986
if (debug){
987
fprintf(stderr, "%s exiting\n", argv[0]);
988
}
989
990
/* Cleanup things */
991
if (sb != NULL)
992
avahi_s_service_browser_free(sb);
993
994
if (mc.server != NULL)
995
avahi_server_free(mc.server);
996
997
if (mc.simple_poll != NULL)
998
avahi_simple_poll_free(mc.simple_poll);
999
free(pubkeyfile);
1000
free(seckeyfile);
1001
1002
return exitcode;
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;
1003
1707
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0