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- Committer: Björn Påhlsson
- Date: 2008-08-04 15:50:45 UTC
- mfrom: (41 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 42.
- Revision ID: belorn@braxen-20080804155045-gnodwjn34v0a2vhr
merge
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
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() */
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 */
67
44
#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_* */
45
SIOCSIFFLAGS */
46
96
47
#include <avahi-core/core.h>
97
48
#include <avahi-core/lookup.h>
98
49
#include <avahi-core/log.h>
100
51
#include <avahi-common/malloc.h>
101
52
#include <avahi-common/error.h>
102
53
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 */
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 */
112
60
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() */
113
71
/* GPGME */
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
116
gpgme_*
117
GPGME_PROTOCOL_OpenPGP,
118
GPG_ERR_NO_* */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
119
74
120
75
#define BUFFER_SIZE 256
121
76
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
125
126
77
bool debug = false;
127
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
78
const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
129
80
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;
81
const char mandos_protocol_version[] = "1";
132
82
133
/* Used for passing in values through the Avahi callback functions */
83
/* Used for passing in values through all the callback functions */
134
84
typedef struct {
135
85
AvahiSimplePoll *simple_poll;
136
86
AvahiServer *server;
138
88
unsigned int dh_bits;
139
89
gnutls_dh_params_t dh_params;
140
90
const char *priority;
141
gpgme_ctx_t ctx;
142
91
} mandos_context;
143
92
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,
93
size_t adjustbuffer(char **buffer, size_t buffer_length,
158
94
size_t buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
95
if (buffer_length + BUFFER_SIZE > buffer_capacity){
160
96
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
97
if (buffer == NULL){
162
98
return 0;
163
99
}
164
100
buffer_capacity += BUFFER_SIZE;
167
103
}
168
104
169
105
/*
170
* Initialize GPGME.
106
* Decrypt OpenPGP data using keyrings in HOMEDIR.
107
* Returns -1 on error
171
108
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
109
static ssize_t pgp_packet_decrypt (const char *cryptotext,
110
size_t crypto_size,
111
char **plaintext,
112
const char *homedir){
113
gpgme_data_t dh_crypto, dh_plain;
114
gpgme_ctx_t ctx;
174
115
gpgme_error_t rc;
116
ssize_t ret;
117
size_t plaintext_capacity = 0;
118
ssize_t plaintext_length = 0;
175
119
gpgme_engine_info_t engine_info;
176
120
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");
121
if (debug){
122
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
216
123
}
217
124
218
125
/* Init GPGME */
219
126
gpgme_check_version(NULL);
220
127
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
if(rc != GPG_ERR_NO_ERROR){
128
if (rc != GPG_ERR_NO_ERROR){
222
129
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
130
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
131
return -1;
225
132
}
226
133
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){
134
/* Set GPGME home directory for the OpenPGP engine only */
135
rc = gpgme_get_engine_info (&engine_info);
136
if (rc != GPG_ERR_NO_ERROR){
230
137
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
138
gpgme_strsource(rc), gpgme_strerror(rc));
232
return false;
139
return -1;
233
140
}
234
141
while(engine_info != NULL){
235
142
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
236
143
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
237
engine_info->file_name, tempdir);
144
engine_info->file_name, homedir);
238
145
break;
239
146
}
240
147
engine_info = engine_info->next;
241
148
}
242
149
if(engine_info == NULL){
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");
150
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
151
return -1;
277
152
}
278
153
279
154
/* Create new GPGME data buffer from memory cryptotext */
280
155
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
156
0);
282
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
283
158
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
159
gpgme_strsource(rc), gpgme_strerror(rc));
285
160
return -1;
287
162
288
163
/* Create new empty GPGME data buffer for the plaintext */
289
164
rc = gpgme_data_new(&dh_plain);
290
if(rc != GPG_ERR_NO_ERROR){
165
if (rc != GPG_ERR_NO_ERROR){
291
166
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
167
gpgme_strsource(rc), gpgme_strerror(rc));
293
168
gpgme_data_release(dh_crypto);
294
169
return -1;
295
170
}
296
171
172
/* Create new GPGME "context" */
173
rc = gpgme_new(&ctx);
174
if (rc != GPG_ERR_NO_ERROR){
175
fprintf(stderr, "bad gpgme_new: %s: %s\n",
176
gpgme_strsource(rc), gpgme_strerror(rc));
177
plaintext_length = -1;
178
goto decrypt_end;
179
}
180
297
181
/* Decrypt data from the cryptotext data buffer to the plaintext
298
182
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
183
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
184
if (rc != GPG_ERR_NO_ERROR){
301
185
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
186
gpgme_strsource(rc), gpgme_strerror(rc));
303
187
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;
188
goto decrypt_end;
189
}
190
191
if(debug){
192
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
193
}
194
195
if (debug){
196
gpgme_decrypt_result_t result;
197
result = gpgme_op_decrypt_result(ctx);
198
if (result == NULL){
199
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
200
} else {
201
fprintf(stderr, "Unsupported algorithm: %s\n",
202
result->unsupported_algorithm);
203
fprintf(stderr, "Wrong key usage: %d\n",
204
result->wrong_key_usage);
205
if(result->file_name != NULL){
206
fprintf(stderr, "File name: %s\n", result->file_name);
207
}
208
gpgme_recipient_t recipient;
209
recipient = result->recipients;
210
if(recipient){
319
211
while(recipient != NULL){
320
212
fprintf(stderr, "Public key algorithm: %s\n",
321
213
gpgme_pubkey_algo_name(recipient->pubkey_algo));
327
219
}
328
220
}
329
221
}
330
goto decrypt_end;
331
}
332
333
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
335
222
}
336
223
337
224
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
225
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
226
perror("pgpme_data_seek");
340
227
plaintext_length = -1;
341
228
goto decrypt_end;
342
229
}
343
230
344
231
*plaintext = NULL;
345
232
while(true){
346
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
233
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
348
234
plaintext_capacity);
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
235
if (plaintext_capacity == 0){
236
perror("adjustbuffer");
351
237
plaintext_length = -1;
352
238
goto decrypt_end;
353
239
}
355
241
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
242
BUFFER_SIZE);
357
243
/* Print the data, if any */
358
if(ret == 0){
244
if (ret == 0){
359
245
/* EOF */
360
246
break;
361
247
}
366
252
}
367
253
plaintext_length += ret;
368
254
}
369
255
370
256
if(debug){
371
257
fprintf(stderr, "Decrypted password is: ");
372
258
for(ssize_t i = 0; i < plaintext_length; i++){
385
271
return plaintext_length;
386
272
}
387
273
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)
274
static const char * safer_gnutls_strerror (int value) {
275
const char *ret = gnutls_strerror (value);
276
if (ret == NULL)
392
277
ret = "(unknown)";
393
278
return ret;
394
279
}
399
284
fprintf(stderr, "GnuTLS: %s", string);
400
285
}
401
286
402
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
287
static int init_gnutls_global(mandos_context *mc,
288
const char *pubkeyfile,
289
const char *seckeyfile){
404
290
int ret;
405
291
406
292
if(debug){
407
293
fprintf(stderr, "Initializing GnuTLS\n");
408
294
}
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));
295
296
if ((ret = gnutls_global_init ())
297
!= GNUTLS_E_SUCCESS) {
298
fprintf (stderr, "GnuTLS global_init: %s\n",
299
safer_gnutls_strerror(ret));
414
300
return -1;
415
301
}
416
302
417
if(debug){
303
if (debug){
418
304
/* "Use a log level over 10 to enable all debugging options."
419
305
* - GnuTLS manual
420
306
*/
423
309
}
424
310
425
311
/* 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();
312
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
313
!= GNUTLS_E_SUCCESS) {
314
fprintf (stderr, "GnuTLS memory error: %s\n",
315
safer_gnutls_strerror(ret));
434
316
return -1;
435
317
}
436
318
437
319
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
320
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
321
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
322
seckeyfile);
441
323
}
442
324
443
325
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
445
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
326
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
327
if (ret != GNUTLS_E_SUCCESS) {
447
328
fprintf(stderr,
448
329
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
330
" '%s')\n", ret, pubkeyfile, seckeyfile);
331
fprintf(stdout, "The GnuTLS error is: %s\n",
451
332
safer_gnutls_strerror(ret));
452
goto globalfail;
333
return -1;
453
334
}
454
335
455
336
/* 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
337
ret = gnutls_dh_params_init(&mc->dh_params);
338
if (ret != GNUTLS_E_SUCCESS) {
339
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
340
" %s\n", safer_gnutls_strerror(ret));
341
return -1;
342
}
343
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
346
safer_gnutls_strerror(ret));
347
return -1;
348
}
349
350
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
351
471
352
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
353
}
480
354
481
static int init_gnutls_session(gnutls_session_t *session){
355
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
482
356
int ret;
483
357
/* 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){
358
ret = gnutls_init(session, GNUTLS_SERVER);
359
if (ret != GNUTLS_E_SUCCESS){
491
360
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
361
safer_gnutls_strerror(ret));
493
362
}
494
363
495
364
{
496
365
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){
366
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
367
if (ret != GNUTLS_E_SUCCESS) {
505
368
fprintf(stderr, "Syntax error at: %s\n", err);
506
369
fprintf(stderr, "GnuTLS error: %s\n",
507
370
safer_gnutls_strerror(ret));
508
gnutls_deinit(*session);
509
371
return -1;
510
372
}
511
373
}
512
374
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){
375
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
376
mc->cred);
377
if (ret != GNUTLS_E_SUCCESS) {
522
378
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
379
safer_gnutls_strerror(ret));
524
gnutls_deinit(*session);
525
380
return -1;
526
381
}
527
382
528
383
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
384
gnutls_certificate_server_set_request (*session,
385
GNUTLS_CERT_IGNORE);
530
386
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
387
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
532
388
533
389
return 0;
534
390
}
540
396
/* Called when a Mandos server is found */
541
397
static int start_mandos_communication(const char *ip, uint16_t port,
542
398
AvahiIfIndex if_index,
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;
399
mandos_context *mc){
400
int ret, tcp_sd;
401
struct sockaddr_in6 to;
550
402
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
403
char *decrypted_buffer;
552
404
size_t buffer_length = 0;
553
405
size_t buffer_capacity = 0;
406
ssize_t decrypted_buffer_size;
554
407
size_t written;
555
int retval = -1;
408
int retval = 0;
409
char interface[IF_NAMESIZE];
556
410
gnutls_session_t session;
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){
411
gnutls_dh_params_t dh_params;
412
413
ret = init_gnutls_session (mc, &session);
414
if (ret != 0){
581
415
return -1;
582
416
}
583
417
584
418
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
419
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
420
ip, port);
587
421
}
588
422
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
423
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
424
if(tcp_sd < 0) {
592
425
perror("socket");
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;
426
return -1;
427
}
428
429
if(debug){
430
if(if_indextoname((unsigned int)if_index, interface) == NULL){
431
perror("if_indextoname");
432
return -1;
433
}
434
fprintf(stderr, "Binding to interface %s\n", interface);
435
}
436
437
memset(&to,0,sizeof(to)); /* Spurious warning */
438
to.sin6_family = AF_INET6;
439
/* It would be nice to have a way to detect if we were passed an
440
IPv4 address here. Now we assume an IPv6 address. */
441
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
442
if (ret < 0 ){
612
443
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
444
return -1;
615
445
}
616
446
if(ret == 0){
617
int e = errno;
618
447
fprintf(stderr, "Bad address: %s\n", ip);
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
}
448
return -1;
449
}
450
to.sin6_port = htons(port); /* Spurious warning */
644
451
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
452
to.sin6_scope_id = (uint32_t)if_index;
649
453
650
454
if(debug){
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){
455
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
456
char addrstr[INET6_ADDRSTRLEN] = "";
457
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
458
sizeof(addrstr)) == NULL){
674
459
perror("inet_ntop");
675
460
} else {
676
461
if(strcmp(addrstr, ip) != 0){
679
464
}
680
465
}
681
466
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
467
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
468
if (ret < 0){
469
perror("connect");
470
return -1;
471
}
472
706
473
const char *out = mandos_protocol_version;
707
474
written = 0;
708
while(true){
475
while (true){
709
476
size_t out_size = strlen(out);
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
477
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
478
out_size - written));
712
if(ret == -1){
713
int e = errno;
479
if (ret == -1){
714
480
perror("write");
715
errno = e;
481
retval = -1;
716
482
goto mandos_end;
717
483
}
718
484
written += (size_t)ret;
719
485
if(written < out_size){
720
486
continue;
721
487
} else {
722
if(out == mandos_protocol_version){
488
if (out == mandos_protocol_version){
723
489
written = 0;
724
490
out = "\r\n";
725
491
} else {
726
492
break;
727
493
}
728
494
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
495
}
735
496
736
497
if(debug){
737
498
fprintf(stderr, "Establishing TLS session with %s\n", ip);
738
499
}
739
500
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){
501
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
502
503
ret = gnutls_handshake (session);
504
505
if (ret != GNUTLS_E_SUCCESS){
761
506
if(debug){
762
507
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
gnutls_perror(ret);
508
gnutls_perror (ret);
764
509
}
765
errno = EPROTO;
510
retval = -1;
766
511
goto mandos_end;
767
512
}
768
513
769
514
/* Read OpenPGP packet that contains the wanted password */
770
515
771
516
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
517
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
773
518
ip);
774
519
}
775
520
776
521
while(true){
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){
522
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
523
if (buffer_capacity == 0){
524
perror("adjustbuffer");
525
retval = -1;
526
goto mandos_end;
527
}
528
529
ret = gnutls_record_recv(session, buffer+buffer_length,
530
BUFFER_SIZE);
531
if (ret == 0){
800
532
break;
801
533
}
802
if(sret < 0){
803
switch(sret){
534
if (ret < 0){
535
switch(ret){
804
536
case GNUTLS_E_INTERRUPTED:
805
537
case GNUTLS_E_AGAIN:
806
538
break;
807
539
case GNUTLS_E_REHANDSHAKE:
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){
540
ret = gnutls_handshake (session);
541
if (ret < 0){
817
542
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
gnutls_perror(ret);
819
errno = EPROTO;
543
gnutls_perror (ret);
544
retval = -1;
820
545
goto mandos_end;
821
546
}
822
547
break;
823
548
default:
824
549
fprintf(stderr, "Unknown error while reading data from"
825
550
" encrypted session with Mandos server\n");
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
551
retval = -1;
552
gnutls_bye (session, GNUTLS_SHUT_RDWR);
828
553
goto mandos_end;
829
554
}
830
555
} else {
831
buffer_length += (size_t) sret;
556
buffer_length += (size_t) ret;
832
557
}
833
558
}
834
559
836
561
fprintf(stderr, "Closing TLS session\n");
837
562
}
838
563
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;
564
gnutls_bye (session, GNUTLS_SHUT_RDWR);
565
566
if (buffer_length > 0){
854
567
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
568
buffer_length,
856
&decrypted_buffer);
857
if(decrypted_buffer_size >= 0){
858
569
&decrypted_buffer,
570
keydir);
571
if (decrypted_buffer_size >= 0){
859
572
written = 0;
860
573
while(written < (size_t) decrypted_buffer_size){
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);
574
ret = (int)fwrite (decrypted_buffer + written, 1,
575
(size_t)decrypted_buffer_size - written,
576
stdout);
869
577
if(ret == 0 and ferror(stdout)){
870
int e = errno;
871
578
if(debug){
872
579
fprintf(stderr, "Error writing encrypted data: %s\n",
873
580
strerror(errno));
874
581
}
875
errno = e;
876
goto mandos_end;
582
retval = -1;
583
break;
877
584
}
878
585
written += (size_t)ret;
879
586
}
880
retval = 0;
587
free(decrypted_buffer);
588
} else {
589
retval = -1;
881
590
}
882
591
}
883
592
884
593
/* Shutdown procedure */
885
594
886
595
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;
903
retval = -1;
904
}
905
errno = e;
906
}
596
free(buffer);
597
close(tcp_sd);
598
gnutls_deinit (session);
599
gnutls_certificate_free_credentials (mc->cred);
600
gnutls_global_deinit ();
907
601
return retval;
908
602
}
909
603
910
604
static void resolve_callback(AvahiSServiceResolver *r,
911
605
AvahiIfIndex interface,
912
AvahiProtocol proto,
606
AVAHI_GCC_UNUSED AvahiProtocol protocol,
913
607
AvahiResolverEvent event,
914
608
const char *name,
915
609
const char *type,
920
614
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
615
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
616
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
617
void* userdata) {
618
mandos_context *mc = userdata;
619
assert(r); /* Spurious warning */
925
620
926
621
/* Called whenever a service has been resolved successfully or
927
622
timed out */
928
623
929
if(quit_now){
930
return;
931
}
932
933
switch(event){
624
switch (event) {
934
625
default:
935
626
case AVAHI_RESOLVER_FAILURE:
936
627
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
628
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
629
avahi_strerror(avahi_server_errno(mc->server)));
939
630
break;
940
631
941
632
case AVAHI_RESOLVER_FOUND:
943
634
char ip[AVAHI_ADDRESS_STR_MAX];
944
635
avahi_address_snprint(ip, sizeof(ip), address);
945
636
if(debug){
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);
637
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
638
" port %d\n", name, host_name, ip, interface, port);
949
639
}
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);
640
int ret = start_mandos_communication(ip, port, interface, mc);
641
if (ret == 0){
642
exit(EXIT_SUCCESS);
954
643
}
955
644
}
956
645
}
957
646
avahi_s_service_resolver_free(r);
958
647
}
959
648
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);
649
static void browse_callback( AvahiSServiceBrowser *b,
650
AvahiIfIndex interface,
651
AvahiProtocol protocol,
652
AvahiBrowserEvent event,
653
const char *name,
654
const char *type,
655
const char *domain,
656
AVAHI_GCC_UNUSED AvahiLookupResultFlags
657
flags,
658
void* userdata) {
659
mandos_context *mc = userdata;
660
assert(b); /* Spurious warning */
971
661
972
662
/* Called whenever a new services becomes available on the LAN or
973
663
is removed from the LAN */
974
664
975
if(quit_now){
976
return;
977
}
978
979
switch(event){
665
switch (event) {
980
666
default:
981
667
case AVAHI_BROWSER_FAILURE:
982
668
983
669
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
670
avahi_strerror(avahi_server_errno(mc->server)));
671
avahi_simple_poll_quit(mc->simple_poll);
986
672
return;
987
673
988
674
case AVAHI_BROWSER_NEW:
991
677
the callback function is called the Avahi server will free the
992
678
resolver for us. */
993
679
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
680
if (!(avahi_s_service_resolver_new(mc->server, interface,
681
protocol, name, type, domain,
682
AVAHI_PROTO_INET6, 0,
683
resolve_callback, mc)))
997
684
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
685
name, avahi_strerror(avahi_server_errno(mc->server)));
999
686
break;
1000
687
1001
688
case AVAHI_BROWSER_REMOVE:
1010
697
}
1011
698
}
1012
699
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;
700
/* Combines file name and path and returns the malloced new
701
string. some sane checks could/should be added */
702
static const char *combinepath(const char *first, const char *second){
703
size_t f_len = strlen(first);
704
size_t s_len = strlen(second);
705
char *tmp = malloc(f_len + s_len + 2);
706
if (tmp == NULL){
707
return NULL;
708
}
709
if(f_len > 0){
710
memcpy(tmp, first, f_len); /* Spurious warning */
711
}
712
tmp[f_len] = '/';
713
if(s_len > 0){
714
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
715
}
716
tmp[f_len + 1 + s_len] = '\0';
717
return tmp;
1025
718
}
1026
719
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
720
1122
721
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
};
1214
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;
1267
default:
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");
722
AvahiSServiceBrowser *sb = NULL;
723
int error;
724
int ret;
725
int exitcode = EXIT_SUCCESS;
726
const char *interface = "eth0";
727
struct ifreq network;
728
int sd;
729
uid_t uid;
730
gid_t gid;
731
char *connect_to = NULL;
732
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
733
const char *pubkeyfile = "pubkey.txt";
734
const char *seckeyfile = "seckey.txt";
735
mandos_context mc = { .simple_poll = NULL, .server = NULL,
736
.dh_bits = 1024, .priority = "SECURE256"};
737
738
{
739
struct argp_option options[] = {
740
{ .name = "debug", .key = 128,
741
.doc = "Debug mode", .group = 3 },
742
{ .name = "connect", .key = 'c',
743
.arg = "IP",
744
.doc = "Connect directly to a sepcified mandos server", .group = 1 },
745
{ .name = "interface", .key = 'i',
746
.arg = "INTERFACE",
747
.doc = "Interface that Avahi will conntect through", .group = 1 },
748
{ .name = "keydir", .key = 'd',
749
.arg = "KEYDIR",
750
.doc = "Directory where the openpgp keyring is", .group = 1 },
751
{ .name = "seckey", .key = 's',
752
.arg = "SECKEY",
753
.doc = "Secret openpgp key for gnutls authentication", .group = 1 },
754
{ .name = "pubkey", .key = 'p',
755
.arg = "PUBKEY",
756
.doc = "Public openpgp key for gnutls authentication", .group = 2 },
757
{ .name = "dh-bits", .key = 129,
758
.arg = "BITS",
759
.doc = "dh-bits to use in gnutls communication", .group = 2 },
760
{ .name = "priority", .key = 130,
761
.arg = "PRIORITY",
762
.doc = "GNUTLS priority", .group = 1 },
763
{ .name = NULL }
764
};
765
766
767
error_t parse_opt (int key, char *arg, struct argp_state *state) {
768
/* Get the INPUT argument from `argp_parse', which we know is a
769
pointer to our plugin list pointer. */
770
switch (key) {
771
case 128:
772
debug = true;
773
break;
774
case 'c':
775
connect_to = arg;
776
break;
777
case 'i':
778
interface = arg;
779
break;
780
case 'd':
781
keydir = arg;
782
break;
783
case 's':
784
seckeyfile = arg;
785
break;
786
case 'p':
787
pubkeyfile = arg;
788
break;
789
case 129:
790
errno = 0;
791
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
792
if (errno){
793
perror("strtol");
794
exit(EXIT_FAILURE);
795
}
796
break;
797
case 130:
798
mc.priority = arg;
799
break;
800
case ARGP_KEY_ARG:
801
argp_usage (state);
802
break;
803
case ARGP_KEY_END:
804
break;
805
default:
806
return ARGP_ERR_UNKNOWN;
807
}
808
return 0;
809
}
810
811
struct argp argp = { .options = options, .parser = parse_opt,
812
.args_doc = "",
813
.doc = "Mandos client -- Get and decrypt passwords from mandos server" };
814
argp_parse (&argp, argc, argv, 0, 0, NULL);
815
}
816
817
pubkeyfile = combinepath(keydir, pubkeyfile);
818
if (pubkeyfile == NULL){
819
perror("combinepath");
1318
820
exitcode = EXIT_FAILURE;
1319
821
goto end;
1320
822
}
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){
823
824
seckeyfile = combinepath(keydir, seckeyfile);
825
if (seckeyfile == NULL){
826
perror("combinepath");
827
goto end;
828
}
829
830
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
831
if (ret == -1){
832
fprintf(stderr, "init_gnutls_global\n");
833
goto end;
834
}
835
836
uid = getuid();
837
gid = getgid();
838
839
ret = setuid(uid);
840
if (ret == -1){
841
perror("setuid");
842
}
843
844
setgid(gid);
845
if (ret == -1){
846
perror("setgid");
847
}
848
1399
849
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
850
if(if_index == 0){
1401
851
fprintf(stderr, "No such interface: \"%s\"\n", interface);
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__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
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;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
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;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
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++){
852
exit(EXIT_FAILURE);
853
}
854
855
if(connect_to != NULL){
856
/* Connect directly, do not use Zeroconf */
857
/* (Mainly meant for debugging) */
858
char *address = strrchr(connect_to, ':');
859
if(address == NULL){
860
fprintf(stderr, "No colon in address\n");
861
exitcode = EXIT_FAILURE;
862
goto end;
863
}
864
errno = 0;
865
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
866
if(errno){
867
perror("Bad port number");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
*address = '\0';
872
address = connect_to;
873
ret = start_mandos_communication(address, port, if_index, &mc);
874
if(ret < 0){
875
exitcode = EXIT_FAILURE;
876
} else {
877
exitcode = EXIT_SUCCESS;
878
}
879
goto end;
880
}
881
882
/* If the interface is down, bring it up */
883
{
884
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
885
if(sd < 0) {
886
perror("socket");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
}
890
strcpy(network.ifr_name, interface); /* Spurious warning */
1496
891
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
892
if(ret == -1){
1498
893
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 */
1646
avahi_server_config_init(&config);
1647
config.publish_hinfo = 0;
1648
config.publish_addresses = 0;
1649
config.publish_workstation = 0;
1650
config.publish_domain = 0;
1651
1652
/* Allocate a new server */
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
1656
1657
/* Free the Avahi configuration data */
1658
avahi_server_config_free(&config);
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
894
exitcode = EXIT_FAILURE;
895
goto end;
896
}
897
if((network.ifr_flags & IFF_UP) == 0){
898
network.ifr_flags |= IFF_UP;
899
ret = ioctl(sd, SIOCSIFFLAGS, &network);
900
if(ret == -1){
901
perror("ioctl SIOCSIFFLAGS");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
}
906
close(sd);
907
}
908
909
if (not debug){
910
avahi_set_log_function(empty_log);
911
}
912
913
/* Initialize the pseudo-RNG for Avahi */
914
srand((unsigned int) time(NULL));
915
916
/* Allocate main Avahi loop object */
917
mc.simple_poll = avahi_simple_poll_new();
918
if (mc.simple_poll == NULL) {
919
fprintf(stderr, "Avahi: Failed to create simple poll"
920
" object.\n");
921
exitcode = EXIT_FAILURE;
922
goto end;
923
}
924
925
{
926
AvahiServerConfig config;
927
/* Do not publish any local Zeroconf records */
928
avahi_server_config_init(&config);
929
config.publish_hinfo = 0;
930
config.publish_addresses = 0;
931
config.publish_workstation = 0;
932
config.publish_domain = 0;
933
934
/* Allocate a new server */
935
mc.server = avahi_server_new(avahi_simple_poll_get
936
(mc.simple_poll), &config, NULL,
937
NULL, &error);
938
939
/* Free the Avahi configuration data */
940
avahi_server_config_free(&config);
941
}
942
943
/* Check if creating the Avahi server object succeeded */
944
if (mc.server == NULL) {
945
fprintf(stderr, "Failed to create Avahi server: %s\n",
946
avahi_strerror(error));
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
951
/* Create the Avahi service browser */
952
sb = avahi_s_service_browser_new(mc.server, if_index,
953
AVAHI_PROTO_INET6,
954
"_mandos._tcp", NULL, 0,
955
browse_callback, &mc);
956
if (sb == NULL) {
957
fprintf(stderr, "Failed to create service browser: %s\n",
958
avahi_strerror(avahi_server_errno(mc.server)));
959
exitcode = EXIT_FAILURE;
960
goto end;
961
}
962
963
/* Run the main loop */
964
965
if (debug){
966
fprintf(stderr, "Starting Avahi loop search\n");
967
}
968
969
avahi_simple_poll_loop(mc.simple_poll);
970
1696
971
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;
972
973
if (debug){
974
fprintf(stderr, "%s exiting\n", argv[0]);
975
}
976
977
/* Cleanup things */
978
if (sb != NULL)
979
avahi_s_service_browser_free(sb);
980
981
if (mc.server != NULL)
982
avahi_server_free(mc.server);
983
984
if (mc.simple_poll != NULL)
985
avahi_simple_poll_free(mc.simple_poll);
986
free(pubkeyfile);
987
free(seckeyfile);
988
989
return exitcode;
1818
990
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0