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- Committer: teddy at bsnet
- Date: 2010-09-15 17:33:14 UTC
- Revision ID: teddy@fukt.bsnet.se-20100915173314-iiy6ljrwa1mdcbge
* debian/mandos.dirs: Added "etc/dbus-1/system.d".
- 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
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
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(), sleep() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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_* */
43
96
#include <avahi-core/core.h>
44
97
#include <avahi-core/lookup.h>
45
98
#include <avahi-core/log.h>
47
100
#include <avahi-common/malloc.h>
48
101
#include <avahi-common/error.h>
49
102
50
//mandos client part
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
63
64
// gpgme
65
#include <errno.h> /* perror() */
66
#include <gpgme.h>
67
68
// getopt_long
69
#include <getopt.h>
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 */
112
113
/* GPGME */
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
116
gpgme_*
117
GPGME_PROTOCOL_OpenPGP,
118
GPG_ERR_NO_* */
70
119
71
120
#define BUFFER_SIZE 256
72
121
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
76
125
77
126
bool debug = false;
127
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
78
132
79
/* Used for passing in values through all the callback functions */
133
/* Used for passing in values through the Avahi callback functions */
80
134
typedef struct {
81
135
AvahiSimplePoll *simple_poll;
82
136
AvahiServer *server;
83
137
gnutls_certificate_credentials_t cred;
84
138
unsigned int dh_bits;
139
gnutls_dh_params_t dh_params;
85
140
const char *priority;
141
gpgme_ctx_t ctx;
86
142
} mandos_context;
87
143
88
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet,
90
const char *homedir){
91
gpgme_data_t dh_crypto, dh_plain;
92
gpgme_ctx_t ctx;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
152
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
155
* "buffer_length" is how much is already used.
156
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
162
return 0;
163
}
164
buffer_capacity += BUFFER_SIZE;
165
}
166
return buffer_capacity;
167
}
168
169
/*
170
* Initialize GPGME.
171
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
93
174
gpgme_error_t rc;
94
ssize_t ret;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
97
175
gpgme_engine_info_t engine_info;
98
99
if (debug){
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
176
177
178
/*
179
* Helper function to insert pub and seckey to the engine keyring.
180
*/
181
bool import_key(const char *filename){
182
int ret;
183
int fd;
184
gpgme_data_t pgp_data;
185
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
if(fd == -1){
188
perror("open");
189
return false;
190
}
191
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
rc = gpgme_op_import(mc.ctx, pgp_data);
200
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
203
return false;
204
}
205
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
if(ret == -1){
208
perror("close");
209
}
210
gpgme_data_release(pgp_data);
211
return true;
212
}
213
214
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
101
216
}
102
217
103
218
/* Init GPGME */
104
219
gpgme_check_version(NULL);
105
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
106
if (rc != GPG_ERR_NO_ERROR){
221
if(rc != GPG_ERR_NO_ERROR){
107
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
108
223
gpgme_strsource(rc), gpgme_strerror(rc));
109
return -1;
224
return false;
110
225
}
111
226
112
/* Set GPGME home directory */
113
rc = gpgme_get_engine_info (&engine_info);
114
if (rc != GPG_ERR_NO_ERROR){
227
/* Set GPGME home directory for the OpenPGP engine only */
228
rc = gpgme_get_engine_info(&engine_info);
229
if(rc != GPG_ERR_NO_ERROR){
115
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
116
231
gpgme_strsource(rc), gpgme_strerror(rc));
117
return -1;
232
return false;
118
233
}
119
234
while(engine_info != NULL){
120
235
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
121
236
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
122
engine_info->file_name, homedir);
237
engine_info->file_name, tempdir);
123
238
break;
124
239
}
125
240
engine_info = engine_info->next;
126
241
}
127
242
if(engine_info == NULL){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
129
return -1;
130
}
131
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
134
if (rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
244
return false;
245
}
246
247
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
249
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
252
return false;
253
}
254
255
if(not import_key(pubkey) or not import_key(seckey)){
256
return false;
257
}
258
259
return true;
260
}
261
262
/*
263
* Decrypt OpenPGP data.
264
* Returns -1 on error
265
*/
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
size_t crypto_size,
268
char **plaintext){
269
gpgme_data_t dh_crypto, dh_plain;
270
gpgme_error_t rc;
271
ssize_t ret;
272
size_t plaintext_capacity = 0;
273
ssize_t plaintext_length = 0;
274
275
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
277
}
278
279
/* Create new GPGME data buffer from memory cryptotext */
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
0);
282
if(rc != GPG_ERR_NO_ERROR){
135
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
136
284
gpgme_strsource(rc), gpgme_strerror(rc));
137
285
return -1;
139
287
140
288
/* Create new empty GPGME data buffer for the plaintext */
141
289
rc = gpgme_data_new(&dh_plain);
142
if (rc != GPG_ERR_NO_ERROR){
290
if(rc != GPG_ERR_NO_ERROR){
143
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
144
292
gpgme_strsource(rc), gpgme_strerror(rc));
145
return -1;
146
}
147
148
/* Create new GPGME "context" */
149
rc = gpgme_new(&ctx);
150
if (rc != GPG_ERR_NO_ERROR){
151
fprintf(stderr, "bad gpgme_new: %s: %s\n",
152
gpgme_strsource(rc), gpgme_strerror(rc));
153
return -1;
154
}
155
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
158
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
159
if (rc != GPG_ERR_NO_ERROR){
293
gpgme_data_release(dh_crypto);
294
return -1;
295
}
296
297
/* Decrypt data from the cryptotext data buffer to the plaintext
298
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
160
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
161
302
gpgme_strsource(rc), gpgme_strerror(rc));
162
return -1;
163
}
164
165
if(debug){
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
167
}
168
169
if (debug){
170
gpgme_decrypt_result_t result;
171
result = gpgme_op_decrypt_result(ctx);
172
if (result == NULL){
173
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
174
} else {
175
fprintf(stderr, "Unsupported algorithm: %s\n",
176
result->unsupported_algorithm);
177
fprintf(stderr, "Wrong key usage: %d\n",
178
result->wrong_key_usage);
179
if(result->file_name != NULL){
180
fprintf(stderr, "File name: %s\n", result->file_name);
181
}
182
gpgme_recipient_t recipient;
183
recipient = result->recipients;
184
if(recipient){
303
plaintext_length = -1;
304
if(debug){
305
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
307
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
309
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
314
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
316
}
317
gpgme_recipient_t recipient;
318
recipient = result->recipients;
185
319
while(recipient != NULL){
186
320
fprintf(stderr, "Public key algorithm: %s\n",
187
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
193
327
}
194
328
}
195
329
}
330
goto decrypt_end;
196
331
}
197
332
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
333
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
335
}
200
336
201
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
202
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
perror("pgpme_data_seek");
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
340
plaintext_length = -1;
341
goto decrypt_end;
204
342
}
205
343
206
*new_packet = 0;
344
*plaintext = NULL;
207
345
while(true){
208
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
209
*new_packet = realloc(*new_packet,
210
(unsigned int)new_packet_capacity
211
+ BUFFER_SIZE);
212
if (*new_packet == NULL){
213
perror("realloc");
214
return -1;
215
}
216
new_packet_capacity += BUFFER_SIZE;
346
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
217
353
}
218
354
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
220
356
BUFFER_SIZE);
221
357
/* Print the data, if any */
222
if (ret == 0){
358
if(ret == 0){
359
/* EOF */
223
360
break;
224
361
}
225
362
if(ret < 0){
226
363
perror("gpgme_data_read");
227
return -1;
228
}
229
new_packet_length += ret;
230
}
231
232
/* FIXME: check characters before printing to screen so to not print
233
terminal control characters */
234
/* if(debug){ */
235
/* fprintf(stderr, "decrypted password is: "); */
236
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
237
/* fprintf(stderr, "\n"); */
238
/* } */
364
plaintext_length = -1;
365
goto decrypt_end;
366
}
367
plaintext_length += ret;
368
}
369
370
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
372
for(ssize_t i = 0; i < plaintext_length; i++){
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
}
375
fprintf(stderr, "\n");
376
}
377
378
decrypt_end:
379
380
/* Delete the GPGME cryptotext data buffer */
381
gpgme_data_release(dh_crypto);
239
382
240
383
/* Delete the GPGME plaintext data buffer */
241
384
gpgme_data_release(dh_plain);
242
return new_packet_length;
385
return plaintext_length;
243
386
}
244
387
245
static const char * safer_gnutls_strerror (int value) {
246
const char *ret = gnutls_strerror (value);
247
if (ret == NULL)
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
248
392
ret = "(unknown)";
249
393
return ret;
250
394
}
251
395
396
/* GnuTLS log function callback */
252
397
static void debuggnutls(__attribute__((unused)) int level,
253
398
const char* string){
254
fprintf(stderr, "%s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
255
400
}
256
401
257
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
258
gnutls_dh_params_t *dh_params){
259
const char *err;
402
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
260
404
int ret;
261
405
262
406
if(debug){
263
407
fprintf(stderr, "Initializing GnuTLS\n");
264
408
}
265
266
if ((ret = gnutls_global_init ())
267
!= GNUTLS_E_SUCCESS) {
268
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
409
410
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
269
414
return -1;
270
415
}
271
416
272
if (debug){
417
if(debug){
418
/* "Use a log level over 10 to enable all debugging options."
419
* - GnuTLS manual
420
*/
273
421
gnutls_global_set_log_level(11);
274
422
gnutls_global_set_log_function(debuggnutls);
275
423
}
276
424
277
/* openpgp credentials */
278
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
279
!= GNUTLS_E_SUCCESS) {
280
fprintf (stderr, "memory error: %s\n",
281
safer_gnutls_strerror(ret));
425
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
427
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
282
434
return -1;
283
435
}
284
436
285
437
if(debug){
286
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
287
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
288
seckeyfile);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
289
441
}
290
442
291
443
ret = gnutls_certificate_set_openpgp_key_file
292
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
293
if (ret != GNUTLS_E_SUCCESS) {
294
fprintf
295
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
296
" '%s')\n",
297
ret, pubkeyfile, seckeyfile);
298
fprintf(stdout, "The Error is: %s\n",
299
safer_gnutls_strerror(ret));
300
return -1;
301
}
302
303
//GnuTLS server initialization
304
if ((ret = gnutls_dh_params_init(dh_params))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in dh parameter initialization: %s\n",
307
safer_gnutls_strerror(ret));
308
return -1;
309
}
310
311
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
312
!= GNUTLS_E_SUCCESS) {
313
fprintf (stderr, "Error in prime generation: %s\n",
314
safer_gnutls_strerror(ret));
315
return -1;
316
}
317
318
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
319
320
// GnuTLS session creation
321
if ((ret = gnutls_init(session, GNUTLS_SERVER))
322
!= GNUTLS_E_SUCCESS){
444
(mc.cred, pubkeyfilename, seckeyfilename,
445
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
452
goto globalfail;
453
}
454
455
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
460
goto globalfail;
461
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
466
goto globalfail;
467
}
468
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
470
471
return 0;
472
473
globalfail:
474
475
gnutls_certificate_free_credentials(mc.cred);
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
478
return -1;
479
}
480
481
static int init_gnutls_session(gnutls_session_t *session){
482
int ret;
483
/* GnuTLS session creation */
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
323
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
324
492
safer_gnutls_strerror(ret));
325
493
}
326
494
327
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Syntax error at: %s\n", err);
330
fprintf(stderr, "GnuTLS error: %s\n",
331
safer_gnutls_strerror(ret));
332
return -1;
495
{
496
const char *err;
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
508
gnutls_deinit(*session);
509
return -1;
510
}
333
511
}
334
512
335
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
336
mc->cred))
337
!= GNUTLS_E_SUCCESS) {
338
fprintf(stderr, "Error setting a credentials set: %s\n",
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
339
523
safer_gnutls_strerror(ret));
524
gnutls_deinit(*session);
340
525
return -1;
341
526
}
342
527
343
528
/* ignore client certificate if any. */
344
gnutls_certificate_server_set_request (*session,
345
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
346
530
347
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
348
532
349
533
return 0;
350
534
}
351
535
536
/* Avahi log function callback */
352
537
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
353
538
__attribute__((unused)) const char *txt){}
354
539
540
/* Called when a Mandos server is found */
355
541
static int start_mandos_communication(const char *ip, uint16_t port,
356
542
AvahiIfIndex if_index,
357
mandos_context *mc){
358
int ret, tcp_sd;
359
struct sockaddr_in6 to;
543
int af){
544
int ret, tcp_sd = -1;
545
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
360
550
char *buffer = NULL;
361
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
362
552
size_t buffer_length = 0;
363
553
size_t buffer_capacity = 0;
364
ssize_t decrypted_buffer_size;
365
size_t written = 0;
366
int retval = 0;
367
char interface[IF_NAMESIZE];
554
size_t written;
555
int retval = -1;
368
556
gnutls_session_t session;
369
gnutls_dh_params_t dh_params;
557
int pf; /* Protocol family */
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
switch(af){
567
case AF_INET6:
568
pf = PF_INET6;
569
break;
570
case AF_INET:
571
pf = PF_INET;
572
break;
573
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
return -1;
577
}
578
579
ret = init_gnutls_session(&session);
580
if(ret != 0){
581
return -1;
582
}
370
583
371
584
if(debug){
372
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
373
ip, port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
374
587
}
375
588
376
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
377
if(tcp_sd < 0) {
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
378
592
perror("socket");
379
return -1;
380
}
381
382
if(debug){
383
if(if_indextoname((unsigned int)if_index, interface) == NULL){
384
perror("if_indextoname");
385
return -1;
386
}
387
fprintf(stderr, "Binding to interface %s\n", interface);
388
}
389
390
memset(&to,0,sizeof(to)); /* Spurious warning */
391
to.sin6_family = AF_INET6;
392
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
393
if (ret < 0 ){
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
600
}
601
602
memset(&to, 0, sizeof(to));
603
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
609
}
610
if(ret < 0 ){
611
int e = errno;
394
612
perror("inet_pton");
395
return -1;
613
errno = e;
614
goto mandos_end;
396
615
}
397
616
if(ret == 0){
617
int e = errno;
398
618
fprintf(stderr, "Bad address: %s\n", ip);
399
return -1;
400
}
401
to.sin6_port = htons(port); /* Spurious warning */
619
errno = e;
620
goto mandos_end;
621
}
622
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
630
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
635
}
636
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
638
}
639
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
643
}
402
644
403
to.sin6_scope_id = (uint32_t)if_index;
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
404
649
405
650
if(debug){
406
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
407
char addrstr[INET6_ADDRSTRLEN] = "";
408
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
409
sizeof(addrstr)) == NULL){
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
char interface[IF_NAMESIZE];
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
655
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
658
}
659
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
662
}
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
410
674
perror("inet_ntop");
411
675
} else {
412
676
if(strcmp(addrstr, ip) != 0){
415
679
}
416
680
}
417
681
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
419
if (ret < 0){
420
perror("connect");
421
return -1;
422
}
423
424
ret = initgnutls (mc, &session, &dh_params);
425
if (ret != 0){
426
retval = -1;
427
return -1;
428
}
429
430
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
705
706
const char *out = mandos_protocol_version;
707
written = 0;
708
while(true){
709
size_t out_size = strlen(out);
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
712
if(ret == -1){
713
int e = errno;
714
perror("write");
715
errno = e;
716
goto mandos_end;
717
}
718
written += (size_t)ret;
719
if(written < out_size){
720
continue;
721
} else {
722
if(out == mandos_protocol_version){
723
written = 0;
724
out = "\r\n";
725
} else {
726
break;
727
}
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
}
431
735
432
736
if(debug){
433
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
434
738
}
435
739
436
ret = gnutls_handshake (session);
437
438
if (ret != GNUTLS_E_SUCCESS){
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
753
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
758
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
759
760
if(ret != GNUTLS_E_SUCCESS){
439
761
if(debug){
440
fprintf(stderr, "\n*** Handshake failed ***\n");
441
gnutls_perror (ret);
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
gnutls_perror(ret);
442
764
}
443
retval = -1;
444
goto exit;
765
errno = EPROTO;
766
goto mandos_end;
445
767
}
446
768
447
//Retrieve OpenPGP packet that contains the wanted password
769
/* Read OpenPGP packet that contains the wanted password */
448
770
449
771
if(debug){
450
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
451
773
ip);
452
774
}
453
775
454
776
while(true){
455
if (buffer_length + BUFFER_SIZE > buffer_capacity){
456
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
457
if (buffer == NULL){
458
perror("realloc");
459
goto exit;
460
}
461
buffer_capacity += BUFFER_SIZE;
462
}
463
464
ret = gnutls_record_recv(session, buffer+buffer_length,
465
BUFFER_SIZE);
466
if (ret == 0){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
785
if(buffer_capacity == 0){
786
int e = errno;
787
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
794
goto mandos_end;
795
}
796
797
sret = gnutls_record_recv(session, buffer+buffer_length,
798
BUFFER_SIZE);
799
if(sret == 0){
467
800
break;
468
801
}
469
if (ret < 0){
470
switch(ret){
802
if(sret < 0){
803
switch(sret){
471
804
case GNUTLS_E_INTERRUPTED:
472
805
case GNUTLS_E_AGAIN:
473
806
break;
474
807
case GNUTLS_E_REHANDSHAKE:
475
ret = gnutls_handshake (session);
476
if (ret < 0){
477
fprintf(stderr, "\n*** Handshake failed ***\n");
478
gnutls_perror (ret);
479
retval = -1;
480
goto exit;
808
do {
809
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
gnutls_perror(ret);
819
errno = EPROTO;
820
goto mandos_end;
481
821
}
482
822
break;
483
823
default:
484
824
fprintf(stderr, "Unknown error while reading data from"
485
" encrypted session with mandos server\n");
486
retval = -1;
487
gnutls_bye (session, GNUTLS_SHUT_RDWR);
488
goto exit;
825
" encrypted session with Mandos server\n");
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
828
goto mandos_end;
489
829
}
490
830
} else {
491
buffer_length += (size_t) ret;
492
}
493
}
494
495
if (buffer_length > 0){
831
buffer_length += (size_t) sret;
832
}
833
}
834
835
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
837
}
838
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
844
do {
845
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
846
if(quit_now){
847
errno = EINTR;
848
goto mandos_end;
849
}
850
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
851
852
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
496
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
497
855
buffer_length,
498
&decrypted_buffer,
499
keydir);
500
if (decrypted_buffer_size >= 0){
856
&decrypted_buffer);
857
if(decrypted_buffer_size >= 0){
858
859
written = 0;
501
860
while(written < (size_t) decrypted_buffer_size){
502
ret = (int)fwrite (decrypted_buffer + written, 1,
503
(size_t)decrypted_buffer_size - written,
504
stdout);
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
ret = (int)fwrite(decrypted_buffer + written, 1,
867
(size_t)decrypted_buffer_size - written,
868
stdout);
505
869
if(ret == 0 and ferror(stdout)){
870
int e = errno;
506
871
if(debug){
507
872
fprintf(stderr, "Error writing encrypted data: %s\n",
508
873
strerror(errno));
509
874
}
510
retval = -1;
511
break;
875
errno = e;
876
goto mandos_end;
512
877
}
513
878
written += (size_t)ret;
514
879
}
515
free(decrypted_buffer);
516
} else {
880
retval = 0;
881
}
882
}
883
884
/* Shutdown procedure */
885
886
mandos_end:
887
{
888
int e = errno;
889
free(decrypted_buffer);
890
free(buffer);
891
if(tcp_sd >= 0){
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
893
}
894
if(ret == -1){
895
if(e == 0){
896
e = errno;
897
}
898
perror("close");
899
}
900
gnutls_deinit(session);
901
if(quit_now){
902
e = EINTR;
517
903
retval = -1;
518
904
}
519
}
520
521
//shutdown procedure
522
523
if(debug){
524
fprintf(stderr, "Closing TLS session\n");
525
}
526
527
free(buffer);
528
gnutls_bye (session, GNUTLS_SHUT_RDWR);
529
exit:
530
close(tcp_sd);
531
gnutls_deinit (session);
532
gnutls_certificate_free_credentials (mc->cred);
533
gnutls_global_deinit ();
905
errno = e;
906
}
534
907
return retval;
535
908
}
536
909
537
static void resolve_callback( AvahiSServiceResolver *r,
538
AvahiIfIndex interface,
539
AVAHI_GCC_UNUSED AvahiProtocol protocol,
540
AvahiResolverEvent event,
541
const char *name,
542
const char *type,
543
const char *domain,
544
const char *host_name,
545
const AvahiAddress *address,
546
uint16_t port,
547
AVAHI_GCC_UNUSED AvahiStringList *txt,
548
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
549
void* userdata) {
550
mandos_context *mc = userdata;
551
assert(r); /* Spurious warning */
910
static void resolve_callback(AvahiSServiceResolver *r,
911
AvahiIfIndex interface,
912
AvahiProtocol proto,
913
AvahiResolverEvent event,
914
const char *name,
915
const char *type,
916
const char *domain,
917
const char *host_name,
918
const AvahiAddress *address,
919
uint16_t port,
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
552
925
553
926
/* Called whenever a service has been resolved successfully or
554
927
timed out */
555
928
556
switch (event) {
929
if(quit_now){
930
return;
931
}
932
933
switch(event){
557
934
default:
558
935
case AVAHI_RESOLVER_FAILURE:
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
561
avahi_strerror(avahi_server_errno(mc->server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
562
939
break;
563
940
564
941
case AVAHI_RESOLVER_FOUND:
566
943
char ip[AVAHI_ADDRESS_STR_MAX];
567
944
avahi_address_snprint(ip, sizeof(ip), address);
568
945
if(debug){
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
571
949
}
572
int ret = start_mandos_communication(ip, port, interface, mc);
573
if (ret == 0){
574
exit(EXIT_SUCCESS);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
952
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
575
954
}
576
955
}
577
956
}
578
957
avahi_s_service_resolver_free(r);
579
958
}
580
959
581
static void browse_callback( AvahiSServiceBrowser *b,
582
AvahiIfIndex interface,
583
AvahiProtocol protocol,
584
AvahiBrowserEvent event,
585
const char *name,
586
const char *type,
587
const char *domain,
588
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
589
void* userdata) {
590
mandos_context *mc = userdata;
591
assert(b); /* Spurious warning */
960
static void browse_callback(AvahiSServiceBrowser *b,
961
AvahiIfIndex interface,
962
AvahiProtocol protocol,
963
AvahiBrowserEvent event,
964
const char *name,
965
const char *type,
966
const char *domain,
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
flags,
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
592
971
593
972
/* Called whenever a new services becomes available on the LAN or
594
973
is removed from the LAN */
595
974
596
switch (event) {
975
if(quit_now){
976
return;
977
}
978
979
switch(event){
597
980
default:
598
981
case AVAHI_BROWSER_FAILURE:
599
982
600
fprintf(stderr, "(Browser) %s\n",
601
avahi_strerror(avahi_server_errno(mc->server)));
602
avahi_simple_poll_quit(mc->simple_poll);
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
603
986
return;
604
987
605
988
case AVAHI_BROWSER_NEW:
606
/* We ignore the returned resolver object. In the callback
607
function we free it. If the server is terminated before
608
the callback function is called the server will free
609
the resolver for us. */
989
/* We ignore the returned Avahi resolver object. In the callback
990
function we free it. If the Avahi server is terminated before
991
the callback function is called the Avahi server will free the
992
resolver for us. */
610
993
611
if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
612
type, domain,
613
AVAHI_PROTO_INET6, 0,
614
resolve_callback, mc)))
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(mc->server)));
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
617
999
break;
618
1000
619
1001
case AVAHI_BROWSER_REMOVE:
621
1003
622
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
623
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1008
}
624
1009
break;
625
1010
}
626
1011
}
627
1012
628
/* Combines file name and path and returns the malloced new
629
string. some sane checks could/should be added */
630
static const char *combinepath(const char *first, const char *second){
631
size_t f_len = strlen(first);
632
size_t s_len = strlen(second);
633
char *tmp = malloc(f_len + s_len + 2);
634
if (tmp == NULL){
635
return NULL;
636
}
637
if(f_len > 0){
638
memcpy(tmp, first, f_len); /* Spurious warning */
639
}
640
tmp[f_len] = '/';
641
if(s_len > 0){
642
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
643
}
644
tmp[f_len + 1 + s_len] = '\0';
645
return tmp;
646
}
647
648
649
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
650
AvahiServerConfig config;
651
AvahiSServiceBrowser *sb = NULL;
652
int error;
653
int ret;
654
int debug_int;
655
int returncode = EXIT_SUCCESS;
656
const char *interface = "eth0";
657
struct ifreq network;
658
int sd;
659
char *connect_to = NULL;
660
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
661
mandos_context mc = { .simple_poll = NULL, .server = NULL,
662
.dh_bits = 1024, .priority = "SECURE256"};
1013
/* stop main loop after sigterm has been called */
1014
static void handle_sigterm(int sig){
1015
if(quit_now){
1016
return;
1017
}
1018
quit_now = 1;
1019
signal_received = sig;
1020
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
1024
errno = old_errno;
1025
}
1026
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1120
}
1121
1122
int main(int argc, char *argv[]){
1123
AvahiSServiceBrowser *sb = NULL;
1124
int error;
1125
int ret;
1126
intmax_t tmpmax;
1127
char *tmp;
1128
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1136
bool tempdir_created = false;
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
const char *seckey = PATHDIR "/" SECKEY;
1139
const char *pubkey = PATHDIR "/" PUBKEY;
1140
1141
bool gnutls_initialized = false;
1142
bool gpgme_initialized = false;
1143
float delay = 2.5f;
1144
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
/* Lower any group privileges we might have, just to be safe */
1152
errno = 0;
1153
ret = setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
/* Lower user privileges (temporarily) */
1159
errno = 0;
1160
ret = seteuid(uid);
1161
if(ret == -1){
1162
perror("seteuid");
1163
}
1164
1165
if(quit_now){
1166
goto end;
1167
}
1168
1169
{
1170
struct argp_option options[] = {
1171
{ .name = "debug", .key = 128,
1172
.doc = "Debug mode", .group = 3 },
1173
{ .name = "connect", .key = 'c',
1174
.arg = "ADDRESS:PORT",
1175
.doc = "Connect directly to a specific Mandos server",
1176
.group = 1 },
1177
{ .name = "interface", .key = 'i',
1178
.arg = "NAME",
1179
.doc = "Network interface that will be used to search for"
1180
" Mandos servers",
1181
.group = 1 },
1182
{ .name = "seckey", .key = 's',
1183
.arg = "FILE",
1184
.doc = "OpenPGP secret key file base name",
1185
.group = 1 },
1186
{ .name = "pubkey", .key = 'p',
1187
.arg = "FILE",
1188
.doc = "OpenPGP public key file base name",
1189
.group = 2 },
1190
{ .name = "dh-bits", .key = 129,
1191
.arg = "BITS",
1192
.doc = "Bit length of the prime number used in the"
1193
" Diffie-Hellman key exchange",
1194
.group = 2 },
1195
{ .name = "priority", .key = 130,
1196
.arg = "STRING",
1197
.doc = "GnuTLS priority string for the TLS handshake",
1198
.group = 1 },
1199
{ .name = "delay", .key = 131,
1200
.arg = "SECONDS",
1201
.doc = "Maximum delay to wait for interface startup",
1202
.group = 2 },
1203
/*
1204
* These reproduce what we would get without ARGP_NO_HELP
1205
*/
1206
{ .name = "help", .key = '?',
1207
.doc = "Give this help list", .group = -1 },
1208
{ .name = "usage", .key = -3,
1209
.doc = "Give a short usage message", .group = -1 },
1210
{ .name = "version", .key = 'V',
1211
.doc = "Print program version", .group = -1 },
1212
{ .name = NULL }
1213
};
663
1214
664
debug_int = debug ? 1 : 0;
665
while (true){
666
struct option long_options[] = {
667
{"debug", no_argument, &debug_int, 1},
668
{"connect", required_argument, NULL, 'c'},
669
{"interface", required_argument, NULL, 'i'},
670
{"keydir", required_argument, NULL, 'd'},
671
{"seckey", required_argument, NULL, 's'},
672
{"pubkey", required_argument, NULL, 'p'},
673
{"dh-bits", required_argument, NULL, 'D'},
674
{"priority", required_argument, NULL, 'P'},
675
{0, 0, 0, 0} };
676
677
int option_index = 0;
678
ret = getopt_long (argc, argv, "i:", long_options,
679
&option_index);
680
681
if (ret == -1){
682
break;
683
}
684
685
switch(ret){
686
case 0:
687
break;
688
case 'i':
689
interface = optarg;
690
break;
691
case 'c':
692
connect_to = optarg;
693
break;
694
case 'd':
695
keydir = optarg;
696
break;
697
case 'p':
698
pubkeyfile = optarg;
699
break;
700
case 's':
701
seckeyfile = optarg;
702
break;
703
case 'D':
704
errno = 0;
705
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
706
if (errno){
707
perror("strtol");
708
exit(EXIT_FAILURE);
709
}
710
break;
711
case 'P':
712
mc.priority = optarg;
713
break;
714
case '?':
1215
error_t parse_opt(int key, char *arg,
1216
struct argp_state *state){
1217
errno = 0;
1218
switch(key){
1219
case 128: /* --debug */
1220
debug = true;
1221
break;
1222
case 'c': /* --connect */
1223
connect_to = arg;
1224
break;
1225
case 'i': /* --interface */
1226
interface = arg;
1227
break;
1228
case 's': /* --seckey */
1229
seckey = arg;
1230
break;
1231
case 'p': /* --pubkey */
1232
pubkey = arg;
1233
break;
1234
case 129: /* --dh-bits */
1235
errno = 0;
1236
tmpmax = strtoimax(arg, &tmp, 10);
1237
if(errno != 0 or tmp == arg or *tmp != '\0'
1238
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1239
argp_error(state, "Bad number of DH bits");
1240
}
1241
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1242
break;
1243
case 130: /* --priority */
1244
mc.priority = arg;
1245
break;
1246
case 131: /* --delay */
1247
errno = 0;
1248
delay = strtof(arg, &tmp);
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
argp_error(state, "Bad delay");
1251
}
1252
break;
1253
/*
1254
* These reproduce what we would get without ARGP_NO_HELP
1255
*/
1256
case '?': /* --help */
1257
argp_state_help(state, state->out_stream,
1258
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1259
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1260
case -3: /* --usage */
1261
argp_state_help(state, state->out_stream,
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1265
exit(argp_err_exit_status);
1266
break;
715
1267
default:
716
exit(EXIT_FAILURE);
717
}
718
}
719
debug = debug_int ? true : false;
720
721
pubkeyfile = combinepath(keydir, pubkeyfile);
722
if (pubkeyfile == NULL){
723
perror("combinepath");
724
returncode = EXIT_FAILURE;
725
goto exit;
726
}
727
728
seckeyfile = combinepath(keydir, seckeyfile);
729
if (seckeyfile == NULL){
730
perror("combinepath");
731
goto exit;
732
}
733
1268
return ARGP_ERR_UNKNOWN;
1269
}
1270
return errno;
1271
}
1272
1273
struct argp argp = { .options = options, .parser = parse_opt,
1274
.args_doc = "",
1275
.doc = "Mandos client -- Get and decrypt"
1276
" passwords from a Mandos server" };
1277
ret = argp_parse(&argp, argc, argv,
1278
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1279
switch(ret){
1280
case 0:
1281
break;
1282
case ENOMEM:
1283
default:
1284
errno = ret;
1285
perror("argp_parse");
1286
exitcode = EX_OSERR;
1287
goto end;
1288
case EINVAL:
1289
exitcode = EX_USAGE;
1290
goto end;
1291
}
1292
}
1293
1294
if(not debug){
1295
avahi_set_log_function(empty_log);
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
1322
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
from the signal handler */
1325
/* Initialize the pseudo-RNG for Avahi */
1326
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1330
exitcode = EX_UNAVAILABLE;
1331
goto end;
1332
}
1333
1334
sigemptyset(&sigterm_action.sa_mask);
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
if(ret == -1){
1337
perror("sigaddset");
1338
exitcode = EX_OSERR;
1339
goto end;
1340
}
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
if(ret == -1){
1343
perror("sigaddset");
1344
exitcode = EX_OSERR;
1345
goto end;
1346
}
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
if(ret == -1){
1349
perror("sigaddset");
1350
exitcode = EX_OSERR;
1351
goto end;
1352
}
1353
/* Need to check if the handler is SIG_IGN before handling:
1354
| [[info:libc:Initial Signal Actions]] |
1355
| [[info:libc:Basic Signal Handling]] |
1356
*/
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
if(ret == -1){
1359
perror("sigaction");
1360
return EX_OSERR;
1361
}
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
if(ret == -1){
1365
perror("sigaction");
1366
exitcode = EX_OSERR;
1367
goto end;
1368
}
1369
}
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
if(ret == -1){
1372
perror("sigaction");
1373
return EX_OSERR;
1374
}
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
if(ret == -1){
1378
perror("sigaction");
1379
exitcode = EX_OSERR;
1380
goto end;
1381
}
1382
}
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
if(ret == -1){
1385
perror("sigaction");
1386
return EX_OSERR;
1387
}
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
734
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
735
1400
if(if_index == 0){
736
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
737
exit(EXIT_FAILURE);
738
}
739
740
if(connect_to != NULL){
741
/* Connect directly, do not use Zeroconf */
742
/* (Mainly meant for debugging) */
743
char *address = strrchr(connect_to, ':');
744
if(address == NULL){
745
fprintf(stderr, "No colon in address\n");
746
exit(EXIT_FAILURE);
747
}
748
errno = 0;
749
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
750
if(errno){
751
perror("Bad port number");
752
exit(EXIT_FAILURE);
753
}
754
*address = '\0';
755
address = connect_to;
756
ret = start_mandos_communication(address, port, if_index, &mc);
757
if(ret < 0){
758
exit(EXIT_FAILURE);
759
} else {
760
exit(EXIT_SUCCESS);
761
}
762
}
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
763
1427
764
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
765
if(sd < 0) {
1429
if(sd < 0){
766
1430
perror("socket");
767
returncode = EXIT_FAILURE;
768
goto exit;
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
769
1447
}
770
strcpy(network.ifr_name, interface); /* Spurious warning */
1448
strcpy(network.ifr_name, interface);
771
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
772
1450
if(ret == -1){
773
774
1451
perror("ioctl SIOCGIFFLAGS");
775
returncode = EXIT_FAILURE;
776
goto exit;
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
777
1468
}
778
1469
if((network.ifr_flags & IFF_UP) == 0){
779
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
780
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
781
1473
if(ret == -1){
782
perror("ioctl SIOCSIFFLAGS");
783
returncode = EXIT_FAILURE;
784
goto exit;
785
}
786
}
787
close(sd);
788
789
if (not debug){
790
avahi_set_log_function(empty_log);
791
}
792
793
/* Initialize the psuedo-RNG */
794
srand((unsigned int) time(NULL));
795
796
/* Allocate main loop object */
797
if (!(mc.simple_poll = avahi_simple_poll_new())) {
798
fprintf(stderr, "Failed to create simple poll object.\n");
799
returncode = EXIT_FAILURE;
800
goto exit;
801
}
802
803
/* Do not publish any local records */
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
1482
}
1483
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
break;
1501
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
1539
}
1540
1541
if(quit_now){
1542
goto end;
1543
}
1544
1545
ret = init_gnutls_global(pubkey, seckey);
1546
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
1548
exitcode = EX_UNAVAILABLE;
1549
goto end;
1550
} else {
1551
gnutls_initialized = true;
1552
}
1553
1554
if(quit_now){
1555
goto end;
1556
}
1557
1558
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
1565
if(quit_now){
1566
goto end;
1567
}
1568
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
1571
exitcode = EX_UNAVAILABLE;
1572
goto end;
1573
} else {
1574
gpgme_initialized = true;
1575
}
1576
1577
if(quit_now){
1578
goto end;
1579
}
1580
1581
if(connect_to != NULL){
1582
/* Connect directly, do not use Zeroconf */
1583
/* (Mainly meant for debugging) */
1584
char *address = strrchr(connect_to, ':');
1585
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
1587
exitcode = EX_USAGE;
1588
goto end;
1589
}
1590
1591
if(quit_now){
1592
goto end;
1593
}
1594
1595
uint16_t port;
1596
errno = 0;
1597
tmpmax = strtoimax(address+1, &tmp, 10);
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
1601
exitcode = EX_USAGE;
1602
goto end;
1603
}
1604
1605
if(quit_now){
1606
goto end;
1607
}
1608
1609
port = (uint16_t)tmpmax;
1610
*address = '\0';
1611
address = connect_to;
1612
/* Colon in address indicates IPv6 */
1613
int af;
1614
if(strchr(address, ':') != NULL){
1615
af = AF_INET6;
1616
} else {
1617
af = AF_INET;
1618
}
1619
1620
if(quit_now){
1621
goto end;
1622
}
1623
1624
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
1626
if(quit_now or ret == 0){
1627
break;
1628
}
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
1633
exitcode = EXIT_SUCCESS;
1634
}
1635
1636
goto end;
1637
}
1638
1639
if(quit_now){
1640
goto end;
1641
}
1642
1643
{
1644
AvahiServerConfig config;
1645
/* Do not publish any local Zeroconf records */
804
1646
avahi_server_config_init(&config);
805
1647
config.publish_hinfo = 0;
806
1648
config.publish_addresses = 0;
807
1649
config.publish_workstation = 0;
808
1650
config.publish_domain = 0;
809
1651
810
1652
/* Allocate a new server */
811
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
812
&config, NULL, NULL, &error);
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
813
1656
814
/* Free the configuration data */
1657
/* Free the Avahi configuration data */
815
1658
avahi_server_config_free(&config);
816
817
/* Check if creating the server object succeeded */
818
if (!mc.server) {
819
fprintf(stderr, "Failed to create server: %s\n",
820
avahi_strerror(error));
821
returncode = EXIT_FAILURE;
822
goto exit;
823
}
824
825
/* Create the service browser */
826
sb = avahi_s_service_browser_new(mc.server, if_index,
827
AVAHI_PROTO_INET6,
828
"_mandos._tcp", NULL, 0,
829
browse_callback, &mc);
830
if (!sb) {
831
fprintf(stderr, "Failed to create service browser: %s\n",
832
avahi_strerror(avahi_server_errno(mc.server)));
833
returncode = EXIT_FAILURE;
834
goto exit;
835
}
836
837
/* Run the main loop */
838
839
if (debug){
840
fprintf(stderr, "Starting avahi loop search\n");
841
}
842
843
avahi_simple_poll_loop(mc.simple_poll);
844
845
exit:
846
847
if (debug){
848
fprintf(stderr, "%s exiting\n", argv[0]);
849
}
850
851
/* Cleanup things */
852
if (sb)
853
avahi_s_service_browser_free(sb);
854
855
if (mc.server)
856
avahi_server_free(mc.server);
857
858
if (mc.simple_poll)
859
avahi_simple_poll_free(mc.simple_poll);
860
free(pubkeyfile);
861
free(seckeyfile);
862
863
return returncode;
1659
}
1660
1661
/* Check if creating the Avahi server object succeeded */
1662
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
1665
exitcode = EX_UNAVAILABLE;
1666
goto end;
1667
}
1668
1669
if(quit_now){
1670
goto end;
1671
}
1672
1673
/* Create the Avahi service browser */
1674
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
NULL, 0, browse_callback, NULL);
1677
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
1680
exitcode = EX_UNAVAILABLE;
1681
goto end;
1682
}
1683
1684
if(quit_now){
1685
goto end;
1686
}
1687
1688
/* Run the main loop */
1689
1690
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
1695
1696
end:
1697
1698
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
1700
}
1701
1702
/* Cleanup things */
1703
if(sb != NULL)
1704
avahi_s_service_browser_free(sb);
1705
1706
if(mc.server != NULL)
1707
avahi_server_free(mc.server);
1708
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
1711
1712
if(gnutls_initialized){
1713
gnutls_certificate_free_credentials(mc.cred);
1714
gnutls_global_deinit();
1715
gnutls_dh_params_deinit(mc.dh_params);
1716
}
1717
1718
if(gpgme_initialized){
1719
gpgme_release(mc.ctx);
1720
}
1721
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
/* Removes the temp directory used by GPGME */
1755
if(tempdir_created){
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
1776
char *fullname = NULL;
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
direntry->d_name);
1779
if(ret < 0){
1780
perror("asprintf");
1781
continue;
1782
}
1783
ret = remove(fullname);
1784
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
1787
}
1788
free(fullname);
1789
}
1790
closedir(d);
1791
}
1792
ret = rmdir(tempdir);
1793
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
1795
}
1796
}
1797
1798
if(quit_now){
1799
sigemptyset(&old_sigterm_action.sa_mask);
1800
old_sigterm_action.sa_handler = SIG_DFL;
1801
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1802
&old_sigterm_action,
1803
NULL));
1804
if(ret == -1){
1805
perror("sigaction");
1806
}
1807
do {
1808
ret = raise(signal_received);
1809
} while(ret != 0 and errno == EINTR);
1810
if(ret != 0){
1811
perror("raise");
1812
abort();
1813
}
1814
TEMP_FAILURE_RETRY(pause());
1815
}
1816
1817
return exitcode;
864
1818
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0