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- Committer: Teddy Hogeborn
- Date: 2008-08-09 04:56:00 UTC
- mfrom: (24.1.27 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080809045600-m7jx3tj4wwunaffa
Merge.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 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() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout, ferror() */
44
38
#include <stdint.h> /* uint16_t, uint32_t */
45
39
#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 */
40
#include <stdlib.h> /* free() */
41
#include <stdbool.h> /* bool, true */
42
#include <string.h> /* memset(), strcmp(), strlen, strerror() */
43
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
44
SIOCSIFFLAGS */
52
45
#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() */
46
sockaddr_in6, PF_INET6, SOCK_STREAM, INET6_ADDRSTRLEN */
57
47
#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() */
48
struct in6_addr, inet_pton(),
49
connect() */
50
#include <assert.h>
51
#include <errno.h> /* perror() */
52
#include <time.h>
67
53
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
54
SIOCSIFFLAGS, if_indextoname(),
69
55
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() */
56
#include <unistd.h> /* close(), SEEK_SET, off_t, write()*/
57
#include <netinet/in.h>
76
58
#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__ */
59
#include <iso646.h> /* not */
60
#include <argp.h> /* struct argp_option,
61
struct argp_state, struct argp,
62
argp_parse() */
91
63
92
64
/* Avahi */
93
/* All Avahi types, constants and functions
94
Avahi*, avahi_*,
95
AVAHI_* */
96
#include <avahi-core/core.h>
65
#include <avahi-core/core.h> /* AvahiSimplePoll, AvahiServer,
66
AvahiIfIndex */
97
67
#include <avahi-core/lookup.h>
98
#include <avahi-core/log.h>
68
#include <avahi-core/log.h> /* AvahiLogLevel */
99
69
#include <avahi-common/simple-watch.h>
100
70
#include <avahi-common/malloc.h>
101
71
#include <avahi-common/error.h>
102
72
103
73
/* GnuTLS */
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
functions:
106
gnutls_*
74
#include <gnutls/gnutls.h> /* gnutls_certificate_credentials_t,
75
gnutls_dh_params_t,
76
gnutls_strerror(),
77
gnutls_global_init(),
78
gnutls_global_set_log_level(),
79
gnutls_global_set_log_function(),
80
gnutls_certificate_allocate_credentials(),
81
gnutls_global_deinit(),
82
gnutls_dh_params_init(),
83
gnutls_dh_params_generate(),
84
gnutls_certificate_set_dh_params(),
85
gnutls_certificate_free_credentials(),
86
gnutls_session_t, gnutls_init(),
87
gnutls_priority_set_direct(),
88
gnutls_deinit(),
89
gnutls_credentials_set(),
90
gnutls_certificate_server_set_request(),
91
gnutls_dh_set_prime_bits(),
92
gnutls_transport_set_ptr(),
93
gnutls_transport_ptr_t,
94
gnutls_handshake(),
95
gnutls_record_recv()
96
gnutls_perror(), gnutls_bye(),
107
97
init_gnutls_session(),
108
GNUTLS_* */
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
98
GNUTLS_E_SUCCESS,
99
GNUTLS_CRD_CERTIFICATE,
100
GNUTLS_CERT_IGNORE,
101
GNUTLS_E_INTERRUPTED,
102
GNUTLS_E_AGAIN,
103
GNUTLS_E_REHANDSHAKE,
104
GNUTLS_SHUT_RDWR, */
105
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
106
GNUTLS_OPENPGP_FMT_BASE64 */
112
107
113
108
/* GPGME */
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
116
gpgme_*
109
#include <gpgme.h> /* gpgme_data_t, gpgme_ctx_t,
110
gpgme_error_t, gpgme_engine_info_t,
111
gpgme_check_version(),
112
gpgme_engine_check_version(),
113
gpgme_strsource(),
114
gpgme_strerror(),
115
gpgme_get_engine_info(),
116
gpgme_set_engine_info(),
117
gpgme_data_new_from_mem(),
118
gpgme_data_new(), gpgme_new(),
119
gpgme_op_decrypt(),
120
gpgme_decrypt_result_t,
121
gpgme_op_decrypt_result(),
122
gpgme_recipient_t,
123
gpgme_pubkey_algo_name(),
124
gpgme_data_seek(),
125
gpgme_data_read(),
126
gpgme_data_release()
117
127
GPGME_PROTOCOL_OpenPGP,
118
GPG_ERR_NO_* */
128
GPG_ERR_NO_ERROR,
129
GPG_ERR_NO_SECKEY, */
119
130
120
131
#define BUFFER_SIZE 256
121
132
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
125
126
133
bool debug = false;
134
static const char *keydir = "/conf/conf.d/mandos";
127
135
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
136
const char *argp_program_version = "mandosclient 0.9";
129
137
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;
132
138
133
139
/* Used for passing in values through the Avahi callback functions */
134
140
typedef struct {
138
144
unsigned int dh_bits;
139
145
gnutls_dh_params_t dh_params;
140
146
const char *priority;
141
gpgme_ctx_t ctx;
142
147
} mandos_context;
143
148
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
149
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
150
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
151
* "buffer_capacity" is how much is currently allocated,
155
152
* "buffer_length" is how much is already used.
156
153
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t adjustbuffer(char **buffer, size_t buffer_length,
158
155
size_t buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
if (buffer_length + BUFFER_SIZE > buffer_capacity){
160
157
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
158
if (buffer == NULL){
162
159
return 0;
163
160
}
164
161
buffer_capacity += BUFFER_SIZE;
167
164
}
168
165
169
166
/*
170
* Initialize GPGME.
167
* Decrypt OpenPGP data using keyrings in HOMEDIR.
168
* Returns -1 on error
171
169
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
170
static ssize_t pgp_packet_decrypt (const char *cryptotext,
171
size_t crypto_size,
172
char **plaintext,
173
const char *homedir){
174
gpgme_data_t dh_crypto, dh_plain;
175
gpgme_ctx_t ctx;
174
176
gpgme_error_t rc;
177
ssize_t ret;
178
size_t plaintext_capacity = 0;
179
ssize_t plaintext_length = 0;
175
180
gpgme_engine_info_t engine_info;
176
181
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");
182
if (debug){
183
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
216
184
}
217
185
218
186
/* Init GPGME */
219
187
gpgme_check_version(NULL);
220
188
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
if(rc != GPG_ERR_NO_ERROR){
189
if (rc != GPG_ERR_NO_ERROR){
222
190
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
191
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
192
return -1;
225
193
}
226
194
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){
195
/* Set GPGME home directory for the OpenPGP engine only */
196
rc = gpgme_get_engine_info (&engine_info);
197
if (rc != GPG_ERR_NO_ERROR){
230
198
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
199
gpgme_strsource(rc), gpgme_strerror(rc));
232
return false;
200
return -1;
233
201
}
234
202
while(engine_info != NULL){
235
203
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
236
204
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
237
engine_info->file_name, tempdir);
205
engine_info->file_name, homedir);
238
206
break;
239
207
}
240
208
engine_info = engine_info->next;
241
209
}
242
210
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");
211
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
212
return -1;
277
213
}
278
214
279
215
/* Create new GPGME data buffer from memory cryptotext */
280
216
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
217
0);
282
if(rc != GPG_ERR_NO_ERROR){
218
if (rc != GPG_ERR_NO_ERROR){
283
219
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
220
gpgme_strsource(rc), gpgme_strerror(rc));
285
221
return -1;
287
223
288
224
/* Create new empty GPGME data buffer for the plaintext */
289
225
rc = gpgme_data_new(&dh_plain);
290
if(rc != GPG_ERR_NO_ERROR){
226
if (rc != GPG_ERR_NO_ERROR){
291
227
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
228
gpgme_strsource(rc), gpgme_strerror(rc));
293
229
gpgme_data_release(dh_crypto);
294
230
return -1;
295
231
}
296
232
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&ctx);
235
if (rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
plaintext_length = -1;
239
goto decrypt_end;
240
}
241
297
242
/* Decrypt data from the cryptotext data buffer to the plaintext
298
243
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
244
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
245
if (rc != GPG_ERR_NO_ERROR){
301
246
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
247
gpgme_strsource(rc), gpgme_strerror(rc));
303
248
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;
249
goto decrypt_end;
250
}
251
252
if(debug){
253
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
254
}
255
256
if (debug){
257
gpgme_decrypt_result_t result;
258
result = gpgme_op_decrypt_result(ctx);
259
if (result == NULL){
260
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
261
} else {
262
fprintf(stderr, "Unsupported algorithm: %s\n",
263
result->unsupported_algorithm);
264
fprintf(stderr, "Wrong key usage: %d\n",
265
result->wrong_key_usage);
266
if(result->file_name != NULL){
267
fprintf(stderr, "File name: %s\n", result->file_name);
268
}
269
gpgme_recipient_t recipient;
270
recipient = result->recipients;
271
if(recipient){
319
272
while(recipient != NULL){
320
273
fprintf(stderr, "Public key algorithm: %s\n",
321
274
gpgme_pubkey_algo_name(recipient->pubkey_algo));
327
280
}
328
281
}
329
282
}
330
goto decrypt_end;
331
}
332
333
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
335
283
}
336
284
337
285
/* 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");
286
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
287
perror("pgpme_data_seek");
340
288
plaintext_length = -1;
341
289
goto decrypt_end;
342
290
}
343
291
344
292
*plaintext = NULL;
345
293
while(true){
346
plaintext_capacity = incbuffer(plaintext,
294
plaintext_capacity = adjustbuffer(plaintext,
347
295
(size_t)plaintext_length,
348
296
plaintext_capacity);
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
297
if (plaintext_capacity == 0){
298
perror("adjustbuffer");
351
299
plaintext_length = -1;
352
300
goto decrypt_end;
353
301
}
355
303
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
304
BUFFER_SIZE);
357
305
/* Print the data, if any */
358
if(ret == 0){
306
if (ret == 0){
359
307
/* EOF */
360
308
break;
361
309
}
366
314
}
367
315
plaintext_length += ret;
368
316
}
369
317
370
318
if(debug){
371
319
fprintf(stderr, "Decrypted password is: ");
372
320
for(ssize_t i = 0; i < plaintext_length; i++){
385
333
return plaintext_length;
386
334
}
387
335
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)
336
static const char * safer_gnutls_strerror (int value) {
337
const char *ret = gnutls_strerror (value);
338
if (ret == NULL)
392
339
ret = "(unknown)";
393
340
return ret;
394
341
}
399
346
fprintf(stderr, "GnuTLS: %s", string);
400
347
}
401
348
402
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
349
static int init_gnutls_global(mandos_context *mc,
350
const char *pubkeyfile,
351
const char *seckeyfile){
404
352
int ret;
405
353
406
354
if(debug){
407
355
fprintf(stderr, "Initializing GnuTLS\n");
408
356
}
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));
357
358
if ((ret = gnutls_global_init ())
359
!= GNUTLS_E_SUCCESS) {
360
fprintf (stderr, "GnuTLS global_init: %s\n",
361
safer_gnutls_strerror(ret));
414
362
return -1;
415
363
}
416
364
417
if(debug){
365
if (debug){
418
366
/* "Use a log level over 10 to enable all debugging options."
419
367
* - GnuTLS manual
420
368
*/
423
371
}
424
372
425
373
/* 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();
374
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
375
!= GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "GnuTLS memory error: %s\n",
377
safer_gnutls_strerror(ret));
378
gnutls_global_deinit ();
434
379
return -1;
435
380
}
436
381
437
382
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
383
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
384
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
385
seckeyfile);
441
386
}
442
387
443
388
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
445
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
389
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
390
if (ret != GNUTLS_E_SUCCESS) {
447
391
fprintf(stderr,
448
392
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
393
" '%s')\n", ret, pubkeyfile, seckeyfile);
394
fprintf(stdout, "The GnuTLS error is: %s\n",
451
395
safer_gnutls_strerror(ret));
452
396
goto globalfail;
453
397
}
454
398
455
399
/* 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
400
ret = gnutls_dh_params_init(&mc->dh_params);
401
if (ret != GNUTLS_E_SUCCESS) {
402
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
403
" %s\n", safer_gnutls_strerror(ret));
404
goto globalfail;
405
}
406
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
409
safer_gnutls_strerror(ret));
410
goto globalfail;
411
}
412
413
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
414
471
415
return 0;
472
416
473
417
globalfail:
474
475
gnutls_certificate_free_credentials(mc.cred);
418
419
gnutls_certificate_free_credentials(mc->cred);
476
420
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
478
421
return -1;
422
479
423
}
480
424
481
static int init_gnutls_session(gnutls_session_t *session){
425
static int init_gnutls_session(mandos_context *mc,
426
gnutls_session_t *session){
482
427
int ret;
483
428
/* 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){
429
ret = gnutls_init(session, GNUTLS_SERVER);
430
if (ret != GNUTLS_E_SUCCESS){
491
431
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
432
safer_gnutls_strerror(ret));
493
433
}
494
434
495
435
{
496
436
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){
437
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
438
if (ret != GNUTLS_E_SUCCESS) {
505
439
fprintf(stderr, "Syntax error at: %s\n", err);
506
440
fprintf(stderr, "GnuTLS error: %s\n",
507
441
safer_gnutls_strerror(ret));
508
gnutls_deinit(*session);
442
gnutls_deinit (*session);
509
443
return -1;
510
444
}
511
445
}
512
446
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){
447
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
448
mc->cred);
449
if (ret != GNUTLS_E_SUCCESS) {
522
450
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
451
safer_gnutls_strerror(ret));
524
gnutls_deinit(*session);
452
gnutls_deinit (*session);
525
453
return -1;
526
454
}
527
455
528
456
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
457
gnutls_certificate_server_set_request (*session,
458
GNUTLS_CERT_IGNORE);
530
459
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
460
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
532
461
533
462
return 0;
534
463
}
540
469
/* Called when a Mandos server is found */
541
470
static int start_mandos_communication(const char *ip, uint16_t port,
542
471
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;
472
mandos_context *mc){
473
int ret, tcp_sd;
474
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
550
475
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
476
char *decrypted_buffer;
552
477
size_t buffer_length = 0;
553
478
size_t buffer_capacity = 0;
479
ssize_t decrypted_buffer_size;
554
480
size_t written;
555
int retval = -1;
481
int retval = 0;
482
char interface[IF_NAMESIZE];
556
483
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){
484
485
ret = init_gnutls_session (mc, &session);
486
if (ret != 0){
581
487
return -1;
582
488
}
583
489
584
490
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
491
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
492
ip, port);
587
493
}
588
494
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
495
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
496
if(tcp_sd < 0) {
592
497
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;
498
return -1;
499
}
500
501
if(debug){
502
if(if_indextoname((unsigned int)if_index, interface) == NULL){
503
perror("if_indextoname");
504
return -1;
505
}
506
fprintf(stderr, "Binding to interface %s\n", interface);
507
}
508
509
memset(&to,0,sizeof(to)); /* Spurious warning */
510
to.in6.sin6_family = AF_INET6;
511
/* It would be nice to have a way to detect if we were passed an
512
IPv4 address here. Now we assume an IPv6 address. */
513
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
514
if (ret < 0 ){
612
515
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
516
return -1;
615
517
}
616
518
if(ret == 0){
617
int e = errno;
618
519
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
}
520
return -1;
521
}
522
to.in6.sin6_port = htons(port); /* Spurious warning */
644
523
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
524
to.in6.sin6_scope_id = (uint32_t)if_index;
649
525
650
526
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){
527
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
528
char addrstr[INET6_ADDRSTRLEN] = "";
529
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
530
sizeof(addrstr)) == NULL){
674
531
perror("inet_ntop");
675
532
} else {
676
533
if(strcmp(addrstr, ip) != 0){
679
536
}
680
537
}
681
538
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
539
ret = connect(tcp_sd, &to.in, sizeof(to));
540
if (ret < 0){
541
perror("connect");
542
return -1;
543
}
544
706
545
const char *out = mandos_protocol_version;
707
546
written = 0;
708
while(true){
547
while (true){
709
548
size_t out_size = strlen(out);
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
549
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
550
out_size - written));
712
if(ret == -1){
713
int e = errno;
551
if (ret == -1){
714
552
perror("write");
715
errno = e;
553
retval = -1;
716
554
goto mandos_end;
717
555
}
718
556
written += (size_t)ret;
719
557
if(written < out_size){
720
558
continue;
721
559
} else {
722
if(out == mandos_protocol_version){
560
if (out == mandos_protocol_version){
723
561
written = 0;
724
562
out = "\r\n";
725
563
} else {
726
564
break;
727
565
}
728
566
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
567
}
735
568
736
569
if(debug){
737
570
fprintf(stderr, "Establishing TLS session with %s\n", ip);
738
571
}
739
572
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){
573
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
574
575
ret = gnutls_handshake (session);
576
577
if (ret != GNUTLS_E_SUCCESS){
761
578
if(debug){
762
579
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
gnutls_perror(ret);
580
gnutls_perror (ret);
764
581
}
765
errno = EPROTO;
582
retval = -1;
766
583
goto mandos_end;
767
584
}
768
585
769
586
/* Read OpenPGP packet that contains the wanted password */
770
587
771
588
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
589
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
773
590
ip);
774
591
}
775
592
776
593
while(true){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
buffer_capacity = incbuffer(&buffer, buffer_length,
594
buffer_capacity = adjustbuffer(&buffer, buffer_length,
784
595
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){
596
if (buffer_capacity == 0){
597
perror("adjustbuffer");
598
retval = -1;
599
goto mandos_end;
600
}
601
602
ret = gnutls_record_recv(session, buffer+buffer_length,
603
BUFFER_SIZE);
604
if (ret == 0){
800
605
break;
801
606
}
802
if(sret < 0){
803
switch(sret){
607
if (ret < 0){
608
switch(ret){
804
609
case GNUTLS_E_INTERRUPTED:
805
610
case GNUTLS_E_AGAIN:
806
611
break;
807
612
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){
613
ret = gnutls_handshake (session);
614
if (ret < 0){
817
615
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
gnutls_perror(ret);
819
errno = EPROTO;
616
gnutls_perror (ret);
617
retval = -1;
820
618
goto mandos_end;
821
619
}
822
620
break;
823
621
default:
824
622
fprintf(stderr, "Unknown error while reading data from"
825
623
" encrypted session with Mandos server\n");
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
624
retval = -1;
625
gnutls_bye (session, GNUTLS_SHUT_RDWR);
828
626
goto mandos_end;
829
627
}
830
628
} else {
831
buffer_length += (size_t) sret;
629
buffer_length += (size_t) ret;
832
630
}
833
631
}
834
632
836
634
fprintf(stderr, "Closing TLS session\n");
837
635
}
838
636
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;
637
gnutls_bye (session, GNUTLS_SHUT_RDWR);
638
639
if (buffer_length > 0){
854
640
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
641
buffer_length,
856
&decrypted_buffer);
857
if(decrypted_buffer_size >= 0){
858
642
&decrypted_buffer,
643
keydir);
644
if (decrypted_buffer_size >= 0){
859
645
written = 0;
860
646
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);
647
ret = (int)fwrite (decrypted_buffer + written, 1,
648
(size_t)decrypted_buffer_size - written,
649
stdout);
869
650
if(ret == 0 and ferror(stdout)){
870
int e = errno;
871
651
if(debug){
872
652
fprintf(stderr, "Error writing encrypted data: %s\n",
873
653
strerror(errno));
874
654
}
875
errno = e;
876
goto mandos_end;
655
retval = -1;
656
break;
877
657
}
878
658
written += (size_t)ret;
879
659
}
880
retval = 0;
660
free(decrypted_buffer);
661
} else {
662
retval = -1;
881
663
}
882
664
}
883
665
884
666
/* Shutdown procedure */
885
667
886
668
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
}
669
free(buffer);
670
close(tcp_sd);
671
gnutls_deinit (session);
907
672
return retval;
908
673
}
909
674
910
675
static void resolve_callback(AvahiSServiceResolver *r,
911
676
AvahiIfIndex interface,
912
AvahiProtocol proto,
677
AVAHI_GCC_UNUSED AvahiProtocol protocol,
913
678
AvahiResolverEvent event,
914
679
const char *name,
915
680
const char *type,
920
685
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
686
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
687
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
688
void* userdata) {
689
mandos_context *mc = userdata;
690
assert(r); /* Spurious warning */
925
691
926
692
/* Called whenever a service has been resolved successfully or
927
693
timed out */
928
694
929
if(quit_now){
930
return;
931
}
932
933
switch(event){
695
switch (event) {
934
696
default:
935
697
case AVAHI_RESOLVER_FAILURE:
936
698
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
699
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
700
avahi_strerror(avahi_server_errno(mc->server)));
939
701
break;
940
702
941
703
case AVAHI_RESOLVER_FOUND:
943
705
char ip[AVAHI_ADDRESS_STR_MAX];
944
706
avahi_address_snprint(ip, sizeof(ip), address);
945
707
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);
708
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
709
" port %d\n", name, host_name, ip, interface, port);
949
710
}
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);
711
int ret = start_mandos_communication(ip, port, interface, mc);
712
if (ret == 0){
713
exit(EXIT_SUCCESS);
954
714
}
955
715
}
956
716
}
957
717
avahi_s_service_resolver_free(r);
958
718
}
959
719
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);
720
static void browse_callback( AvahiSServiceBrowser *b,
721
AvahiIfIndex interface,
722
AvahiProtocol protocol,
723
AvahiBrowserEvent event,
724
const char *name,
725
const char *type,
726
const char *domain,
727
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(b); /* Spurious warning */
971
732
972
733
/* Called whenever a new services becomes available on the LAN or
973
734
is removed from the LAN */
974
735
975
if(quit_now){
976
return;
977
}
978
979
switch(event){
736
switch (event) {
980
737
default:
981
738
case AVAHI_BROWSER_FAILURE:
982
739
983
740
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
741
avahi_strerror(avahi_server_errno(mc->server)));
742
avahi_simple_poll_quit(mc->simple_poll);
986
743
return;
987
744
988
745
case AVAHI_BROWSER_NEW:
991
748
the callback function is called the Avahi server will free the
992
749
resolver for us. */
993
750
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
751
if (!(avahi_s_service_resolver_new(mc->server, interface,
752
protocol, name, type, domain,
753
AVAHI_PROTO_INET6, 0,
754
resolve_callback, mc)))
997
755
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
756
name, avahi_strerror(avahi_server_errno(mc->server)));
999
757
break;
1000
758
1001
759
case AVAHI_BROWSER_REMOVE:
1010
768
}
1011
769
}
1012
770
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;
771
/* Combines file name and path and returns the malloced new
772
string. some sane checks could/should be added */
773
static const char *combinepath(const char *first, const char *second){
774
size_t f_len = strlen(first);
775
size_t s_len = strlen(second);
776
char *tmp = malloc(f_len + s_len + 2);
777
if (tmp == NULL){
778
return NULL;
779
}
780
if(f_len > 0){
781
memcpy(tmp, first, f_len); /* Spurious warning */
782
}
783
tmp[f_len] = '/';
784
if(s_len > 0){
785
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
786
}
787
tmp[f_len + 1 + s_len] = '\0';
788
return tmp;
1025
789
}
1026
790
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
if(if_entry->d_name[0] == '.'){
1036
return 0;
1037
}
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if_entry->d_name);
1040
if(ret < 0){
1041
perror("asprintf");
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
free(flagname);
1048
return 0;
1049
}
1050
free(flagname);
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1057
perror("malloc");
1058
close(flags_fd);
1059
return 0;
1060
}
1061
while(to_read > 0){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1063
(size_t)to_read));
1064
if(ssret == -1){
1065
perror("read");
1066
free(flagstring);
1067
close(flags_fd);
1068
return 0;
1069
}
1070
to_read -= ssret;
1071
if(ssret == 0){
1072
break;
1073
}
1074
}
1075
close(flags_fd);
1076
intmax_t tmpmax;
1077
char *tmp;
1078
errno = 0;
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1083
if(debug){
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1086
}
1087
free(flagstring);
1088
return 0;
1089
}
1090
free(flagstring);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1092
/* Reject the loopback device */
1093
if(flags & IFF_LOOPBACK){
1094
if(debug){
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
if_entry->d_name);
1097
}
1098
return 0;
1099
}
1100
/* Accept point-to-point devices only if connect_to is specified */
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1102
if(debug){
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
if_entry->d_name);
1105
}
1106
return 1;
1107
}
1108
/* Otherwise, reject non-broadcast-capable devices */
1109
if(not (flags & IFF_BROADCAST)){
1110
if(debug){
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
if_entry->d_name);
1113
}
1114
return 0;
1115
}
1116
/* Reject non-ARP interfaces (including dummy interfaces) */
1117
if(flags & IFF_NOARP){
1118
if(debug){
1119
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1120
if_entry->d_name);
1121
}
1122
return 0;
1123
}
1124
/* Accept this device */
1125
if(debug){
1126
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1127
if_entry->d_name);
1128
}
1129
return 1;
1130
}
1131
791
1132
792
int main(int argc, char *argv[]){
1133
AvahiSServiceBrowser *sb = NULL;
1134
int error;
1135
int ret;
1136
intmax_t tmpmax;
1137
char *tmp;
1138
int exitcode = EXIT_SUCCESS;
1139
const char *interface = "";
1140
struct ifreq network;
1141
int sd = -1;
1142
bool take_down_interface = false;
1143
uid_t uid;
1144
gid_t gid;
1145
char tempdir[] = "/tmp/mandosXXXXXX";
1146
bool tempdir_created = false;
1147
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1148
const char *seckey = PATHDIR "/" SECKEY;
1149
const char *pubkey = PATHDIR "/" PUBKEY;
1150
1151
bool gnutls_initialized = false;
1152
bool gpgme_initialized = false;
1153
float delay = 2.5f;
1154
1155
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1156
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1157
1158
uid = getuid();
1159
gid = getgid();
1160
1161
/* Lower any group privileges we might have, just to be safe */
1162
errno = 0;
1163
ret = setgid(gid);
1164
if(ret == -1){
1165
perror("setgid");
1166
}
1167
1168
/* Lower user privileges (temporarily) */
1169
errno = 0;
1170
ret = seteuid(uid);
1171
if(ret == -1){
1172
perror("seteuid");
1173
}
1174
1175
if(quit_now){
1176
goto end;
1177
}
1178
1179
{
1180
struct argp_option options[] = {
1181
{ .name = "debug", .key = 128,
1182
.doc = "Debug mode", .group = 3 },
1183
{ .name = "connect", .key = 'c',
1184
.arg = "ADDRESS:PORT",
1185
.doc = "Connect directly to a specific Mandos server",
1186
.group = 1 },
1187
{ .name = "interface", .key = 'i',
1188
.arg = "NAME",
1189
.doc = "Network interface that will be used to search for"
1190
" Mandos servers",
1191
.group = 1 },
1192
{ .name = "seckey", .key = 's',
1193
.arg = "FILE",
1194
.doc = "OpenPGP secret key file base name",
1195
.group = 1 },
1196
{ .name = "pubkey", .key = 'p',
1197
.arg = "FILE",
1198
.doc = "OpenPGP public key file base name",
1199
.group = 2 },
1200
{ .name = "dh-bits", .key = 129,
1201
.arg = "BITS",
1202
.doc = "Bit length of the prime number used in the"
1203
" Diffie-Hellman key exchange",
1204
.group = 2 },
1205
{ .name = "priority", .key = 130,
1206
.arg = "STRING",
1207
.doc = "GnuTLS priority string for the TLS handshake",
1208
.group = 1 },
1209
{ .name = "delay", .key = 131,
1210
.arg = "SECONDS",
1211
.doc = "Maximum delay to wait for interface startup",
1212
.group = 2 },
1213
/*
1214
* These reproduce what we would get without ARGP_NO_HELP
1215
*/
1216
{ .name = "help", .key = '?',
1217
.doc = "Give this help list", .group = -1 },
1218
{ .name = "usage", .key = -3,
1219
.doc = "Give a short usage message", .group = -1 },
1220
{ .name = "version", .key = 'V',
1221
.doc = "Print program version", .group = -1 },
1222
{ .name = NULL }
1223
};
1224
1225
error_t parse_opt(int key, char *arg,
1226
struct argp_state *state){
1227
errno = 0;
1228
switch(key){
1229
case 128: /* --debug */
1230
debug = true;
1231
break;
1232
case 'c': /* --connect */
1233
connect_to = arg;
1234
break;
1235
case 'i': /* --interface */
1236
interface = arg;
1237
break;
1238
case 's': /* --seckey */
1239
seckey = arg;
1240
break;
1241
case 'p': /* --pubkey */
1242
pubkey = arg;
1243
break;
1244
case 129: /* --dh-bits */
1245
errno = 0;
1246
tmpmax = strtoimax(arg, &tmp, 10);
1247
if(errno != 0 or tmp == arg or *tmp != '\0'
1248
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1249
argp_error(state, "Bad number of DH bits");
1250
}
1251
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1252
break;
1253
case 130: /* --priority */
1254
mc.priority = arg;
1255
break;
1256
case 131: /* --delay */
1257
errno = 0;
1258
delay = strtof(arg, &tmp);
1259
if(errno != 0 or tmp == arg or *tmp != '\0'){
1260
argp_error(state, "Bad delay");
1261
}
1262
break;
1263
/*
1264
* These reproduce what we would get without ARGP_NO_HELP
1265
*/
1266
case '?': /* --help */
1267
argp_state_help(state, state->out_stream,
1268
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1269
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1270
case -3: /* --usage */
1271
argp_state_help(state, state->out_stream,
1272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1273
case 'V': /* --version */
1274
fprintf(state->out_stream, "%s\n", argp_program_version);
1275
exit(argp_err_exit_status);
1276
break;
1277
default:
1278
return ARGP_ERR_UNKNOWN;
1279
}
1280
return errno;
1281
}
1282
1283
struct argp argp = { .options = options, .parser = parse_opt,
1284
.args_doc = "",
1285
.doc = "Mandos client -- Get and decrypt"
1286
" passwords from a Mandos server" };
1287
ret = argp_parse(&argp, argc, argv,
1288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1289
switch(ret){
1290
case 0:
1291
break;
1292
case ENOMEM:
1293
default:
1294
errno = ret;
1295
perror("argp_parse");
1296
exitcode = EX_OSERR;
1297
goto end;
1298
case EINVAL:
1299
exitcode = EX_USAGE;
1300
goto end;
1301
}
1302
}
1303
1304
if(not debug){
1305
avahi_set_log_function(empty_log);
1306
}
1307
1308
if(interface[0] == '\0'){
1309
struct dirent **direntries;
1310
ret = scandir(sys_class_net, &direntries, good_interface,
1311
alphasort);
1312
if(ret >= 1){
1313
/* Pick the first good interface */
1314
interface = strdup(direntries[0]->d_name);
1315
if(debug){
1316
fprintf(stderr, "Using interface \"%s\"\n", interface);
1317
}
1318
if(interface == NULL){
1319
perror("malloc");
1320
free(direntries);
1321
exitcode = EXIT_FAILURE;
1322
goto end;
1323
}
1324
free(direntries);
1325
} else {
1326
free(direntries);
1327
fprintf(stderr, "Could not find a network interface\n");
793
AvahiSServiceBrowser *sb = NULL;
794
int error;
795
int ret;
796
int exitcode = EXIT_SUCCESS;
797
const char *interface = "eth0";
798
struct ifreq network;
799
int sd;
800
uid_t uid;
801
gid_t gid;
802
char *connect_to = NULL;
803
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
804
const char *pubkeyfile = "pubkey.txt";
805
const char *seckeyfile = "seckey.txt";
806
mandos_context mc = { .simple_poll = NULL, .server = NULL,
807
.dh_bits = 1024, .priority = "SECURE256"};
808
bool gnutls_initalized = false;
809
810
{
811
struct argp_option options[] = {
812
{ .name = "debug", .key = 128,
813
.doc = "Debug mode", .group = 3 },
814
{ .name = "connect", .key = 'c',
815
.arg = "IP",
816
.doc = "Connect directly to a sepcified mandos server",
817
.group = 1 },
818
{ .name = "interface", .key = 'i',
819
.arg = "INTERFACE",
820
.doc = "Interface that Avahi will conntect through",
821
.group = 1 },
822
{ .name = "keydir", .key = 'd',
823
.arg = "KEYDIR",
824
.doc = "Directory where the openpgp keyring is",
825
.group = 1 },
826
{ .name = "seckey", .key = 's',
827
.arg = "SECKEY",
828
.doc = "Secret openpgp key for gnutls authentication",
829
.group = 1 },
830
{ .name = "pubkey", .key = 'p',
831
.arg = "PUBKEY",
832
.doc = "Public openpgp key for gnutls authentication",
833
.group = 2 },
834
{ .name = "dh-bits", .key = 129,
835
.arg = "BITS",
836
.doc = "dh-bits to use in gnutls communication",
837
.group = 2 },
838
{ .name = "priority", .key = 130,
839
.arg = "PRIORITY",
840
.doc = "GNUTLS priority", .group = 1 },
841
{ .name = NULL }
842
};
843
844
845
error_t parse_opt (int key, char *arg,
846
struct argp_state *state) {
847
/* Get the INPUT argument from `argp_parse', which we know is
848
a pointer to our plugin list pointer. */
849
switch (key) {
850
case 128:
851
debug = true;
852
break;
853
case 'c':
854
connect_to = arg;
855
break;
856
case 'i':
857
interface = arg;
858
break;
859
case 'd':
860
keydir = arg;
861
break;
862
case 's':
863
seckeyfile = arg;
864
break;
865
case 'p':
866
pubkeyfile = arg;
867
break;
868
case 129:
869
errno = 0;
870
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
871
if (errno){
872
perror("strtol");
873
exit(EXIT_FAILURE);
874
}
875
break;
876
case 130:
877
mc.priority = arg;
878
break;
879
case ARGP_KEY_ARG:
880
argp_usage (state);
881
break;
882
case ARGP_KEY_END:
883
break;
884
default:
885
return ARGP_ERR_UNKNOWN;
886
}
887
return 0;
888
}
889
890
struct argp argp = { .options = options, .parser = parse_opt,
891
.args_doc = "",
892
.doc = "Mandos client -- Get and decrypt"
893
" passwords from mandos server" };
894
argp_parse (&argp, argc, argv, 0, 0, NULL);
895
}
896
897
pubkeyfile = combinepath(keydir, pubkeyfile);
898
if (pubkeyfile == NULL){
899
perror("combinepath");
1328
900
exitcode = EXIT_FAILURE;
1329
901
goto end;
1330
902
}
1331
}
1332
1333
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1334
from the signal handler */
1335
/* Initialize the pseudo-RNG for Avahi */
1336
srand((unsigned int) time(NULL));
1337
mc.simple_poll = avahi_simple_poll_new();
1338
if(mc.simple_poll == NULL){
1339
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1340
exitcode = EX_UNAVAILABLE;
1341
goto end;
1342
}
1343
1344
sigemptyset(&sigterm_action.sa_mask);
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1346
if(ret == -1){
1347
perror("sigaddset");
1348
exitcode = EX_OSERR;
1349
goto end;
1350
}
1351
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1352
if(ret == -1){
1353
perror("sigaddset");
1354
exitcode = EX_OSERR;
1355
goto end;
1356
}
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1358
if(ret == -1){
1359
perror("sigaddset");
1360
exitcode = EX_OSERR;
1361
goto end;
1362
}
1363
/* Need to check if the handler is SIG_IGN before handling:
1364
| [[info:libc:Initial Signal Actions]] |
1365
| [[info:libc:Basic Signal Handling]] |
1366
*/
1367
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1368
if(ret == -1){
1369
perror("sigaction");
1370
return EX_OSERR;
1371
}
1372
if(old_sigterm_action.sa_handler != SIG_IGN){
1373
ret = sigaction(SIGINT, &sigterm_action, NULL);
1374
if(ret == -1){
1375
perror("sigaction");
1376
exitcode = EX_OSERR;
1377
goto end;
1378
}
1379
}
1380
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1381
if(ret == -1){
1382
perror("sigaction");
1383
return EX_OSERR;
1384
}
1385
if(old_sigterm_action.sa_handler != SIG_IGN){
1386
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1387
if(ret == -1){
1388
perror("sigaction");
1389
exitcode = EX_OSERR;
1390
goto end;
1391
}
1392
}
1393
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1394
if(ret == -1){
1395
perror("sigaction");
1396
return EX_OSERR;
1397
}
1398
if(old_sigterm_action.sa_handler != SIG_IGN){
1399
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1400
if(ret == -1){
1401
perror("sigaction");
1402
exitcode = EX_OSERR;
1403
goto end;
1404
}
1405
}
1406
1407
/* If the interface is down, bring it up */
1408
if(strcmp(interface, "none") != 0){
903
904
seckeyfile = combinepath(keydir, seckeyfile);
905
if (seckeyfile == NULL){
906
perror("combinepath");
907
goto end;
908
}
909
910
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
911
if (ret == -1){
912
fprintf(stderr, "init_gnutls_global\n");
913
goto end;
914
} else {
915
gnutls_initalized = true;
916
}
917
918
uid = getuid();
919
gid = getgid();
920
921
ret = setuid(uid);
922
if (ret == -1){
923
perror("setuid");
924
}
925
926
setgid(gid);
927
if (ret == -1){
928
perror("setgid");
929
}
930
1409
931
if_index = (AvahiIfIndex) if_nametoindex(interface);
1410
932
if(if_index == 0){
1411
933
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1412
exitcode = EX_UNAVAILABLE;
1413
goto end;
1414
}
1415
1416
if(quit_now){
1417
goto end;
1418
}
1419
1420
/* Re-raise priviliges */
1421
errno = 0;
1422
ret = seteuid(0);
1423
if(ret == -1){
1424
perror("seteuid");
1425
}
1426
1427
#ifdef __linux__
1428
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1429
messages about the network interface to mess up the prompt */
1430
ret = klogctl(8, NULL, 5);
1431
bool restore_loglevel = true;
1432
if(ret == -1){
1433
restore_loglevel = false;
1434
perror("klogctl");
1435
}
1436
#endif /* __linux__ */
1437
1438
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1439
if(sd < 0){
1440
perror("socket");
1441
exitcode = EX_OSERR;
1442
#ifdef __linux__
1443
if(restore_loglevel){
1444
ret = klogctl(7, NULL, 0);
1445
if(ret == -1){
1446
perror("klogctl");
1447
}
1448
}
1449
#endif /* __linux__ */
1450
/* Lower privileges */
1451
errno = 0;
1452
ret = seteuid(uid);
1453
if(ret == -1){
1454
perror("seteuid");
1455
}
1456
goto end;
1457
}
1458
strcpy(network.ifr_name, interface);
1459
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1460
if(ret == -1){
1461
perror("ioctl SIOCGIFFLAGS");
1462
#ifdef __linux__
1463
if(restore_loglevel){
1464
ret = klogctl(7, NULL, 0);
1465
if(ret == -1){
1466
perror("klogctl");
1467
}
1468
}
1469
#endif /* __linux__ */
1470
exitcode = EX_OSERR;
1471
/* Lower privileges */
1472
errno = 0;
1473
ret = seteuid(uid);
1474
if(ret == -1){
1475
perror("seteuid");
1476
}
1477
goto end;
1478
}
1479
if((network.ifr_flags & IFF_UP) == 0){
1480
network.ifr_flags |= IFF_UP;
1481
take_down_interface = true;
1482
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1483
if(ret == -1){
1484
take_down_interface = false;
1485
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1486
exitcode = EX_OSERR;
1487
#ifdef __linux__
1488
if(restore_loglevel){
1489
ret = klogctl(7, NULL, 0);
1490
if(ret == -1){
1491
perror("klogctl");
1492
}
1493
}
1494
#endif /* __linux__ */
1495
/* Lower privileges */
1496
errno = 0;
1497
ret = seteuid(uid);
1498
if(ret == -1){
1499
perror("seteuid");
1500
}
1501
goto end;
1502
}
1503
}
1504
/* sleep checking until interface is running */
1505
for(int i=0; i < delay * 4; i++){
934
exit(EXIT_FAILURE);
935
}
936
937
if(connect_to != NULL){
938
/* Connect directly, do not use Zeroconf */
939
/* (Mainly meant for debugging) */
940
char *address = strrchr(connect_to, ':');
941
if(address == NULL){
942
fprintf(stderr, "No colon in address\n");
943
exitcode = EXIT_FAILURE;
944
goto end;
945
}
946
errno = 0;
947
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
948
if(errno){
949
perror("Bad port number");
950
exitcode = EXIT_FAILURE;
951
goto end;
952
}
953
*address = '\0';
954
address = connect_to;
955
ret = start_mandos_communication(address, port, if_index, &mc);
956
if(ret < 0){
957
exitcode = EXIT_FAILURE;
958
} else {
959
exitcode = EXIT_SUCCESS;
960
}
961
goto end;
962
}
963
964
/* If the interface is down, bring it up */
965
{
966
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
967
if(sd < 0) {
968
perror("socket");
969
exitcode = EXIT_FAILURE;
970
goto end;
971
}
972
strcpy(network.ifr_name, interface); /* Spurious warning */
1506
973
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1507
974
if(ret == -1){
1508
975
perror("ioctl SIOCGIFFLAGS");
1509
} else if(network.ifr_flags & IFF_RUNNING){
1510
break;
1511
}
1512
struct timespec sleeptime = { .tv_nsec = 250000000 };
1513
ret = nanosleep(&sleeptime, NULL);
1514
if(ret == -1 and errno != EINTR){
1515
perror("nanosleep");
1516
}
1517
}
1518
if(not take_down_interface){
1519
/* We won't need the socket anymore */
1520
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1521
if(ret == -1){
1522
perror("close");
1523
}
1524
}
1525
#ifdef __linux__
1526
if(restore_loglevel){
1527
/* Restores kernel loglevel to default */
1528
ret = klogctl(7, NULL, 0);
1529
if(ret == -1){
1530
perror("klogctl");
1531
}
1532
}
1533
#endif /* __linux__ */
1534
/* Lower privileges */
1535
errno = 0;
1536
if(take_down_interface){
1537
/* Lower privileges */
1538
ret = seteuid(uid);
1539
if(ret == -1){
1540
perror("seteuid");
1541
}
1542
} else {
1543
/* Lower privileges permanently */
1544
ret = setuid(uid);
1545
if(ret == -1){
1546
perror("setuid");
1547
}
1548
}
1549
}
1550
1551
if(quit_now){
1552
goto end;
1553
}
1554
1555
ret = init_gnutls_global(pubkey, seckey);
1556
if(ret == -1){
1557
fprintf(stderr, "init_gnutls_global failed\n");
1558
exitcode = EX_UNAVAILABLE;
1559
goto end;
1560
} else {
1561
gnutls_initialized = true;
1562
}
1563
1564
if(quit_now){
1565
goto end;
1566
}
1567
1568
tempdir_created = true;
1569
if(mkdtemp(tempdir) == NULL){
1570
tempdir_created = false;
1571
perror("mkdtemp");
1572
goto end;
1573
}
1574
1575
if(quit_now){
1576
goto end;
1577
}
1578
1579
if(not init_gpgme(pubkey, seckey, tempdir)){
1580
fprintf(stderr, "init_gpgme failed\n");
1581
exitcode = EX_UNAVAILABLE;
1582
goto end;
1583
} else {
1584
gpgme_initialized = true;
1585
}
1586
1587
if(quit_now){
1588
goto end;
1589
}
1590
1591
if(connect_to != NULL){
1592
/* Connect directly, do not use Zeroconf */
1593
/* (Mainly meant for debugging) */
1594
char *address = strrchr(connect_to, ':');
1595
if(address == NULL){
1596
fprintf(stderr, "No colon in address\n");
1597
exitcode = EX_USAGE;
1598
goto end;
1599
}
1600
1601
if(quit_now){
1602
goto end;
1603
}
1604
1605
uint16_t port;
1606
errno = 0;
1607
tmpmax = strtoimax(address+1, &tmp, 10);
1608
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1609
or tmpmax != (uint16_t)tmpmax){
1610
fprintf(stderr, "Bad port number\n");
1611
exitcode = EX_USAGE;
1612
goto end;
1613
}
1614
1615
if(quit_now){
1616
goto end;
1617
}
1618
1619
port = (uint16_t)tmpmax;
1620
*address = '\0';
1621
address = connect_to;
1622
/* Colon in address indicates IPv6 */
1623
int af;
1624
if(strchr(address, ':') != NULL){
1625
af = AF_INET6;
1626
} else {
1627
af = AF_INET;
1628
}
1629
1630
if(quit_now){
1631
goto end;
1632
}
1633
1634
while(not quit_now){
1635
ret = start_mandos_communication(address, port, if_index, af);
1636
if(quit_now or ret == 0){
1637
break;
1638
}
1639
sleep(15);
1640
};
1641
1642
if (not quit_now){
1643
exitcode = EXIT_SUCCESS;
1644
}
1645
1646
goto end;
1647
}
1648
1649
if(quit_now){
1650
goto end;
1651
}
1652
1653
{
1654
AvahiServerConfig config;
1655
/* Do not publish any local Zeroconf records */
1656
avahi_server_config_init(&config);
1657
config.publish_hinfo = 0;
1658
config.publish_addresses = 0;
1659
config.publish_workstation = 0;
1660
config.publish_domain = 0;
1661
1662
/* Allocate a new server */
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
1666
1667
/* Free the Avahi configuration data */
1668
avahi_server_config_free(&config);
1669
}
1670
1671
/* Check if creating the Avahi server object succeeded */
1672
if(mc.server == NULL){
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1680
goto end;
1681
}
1682
1683
/* Create the Avahi service browser */
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
NULL, 0, browse_callback, NULL);
1687
if(sb == NULL){
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1695
goto end;
1696
}
1697
1698
/* Run the main loop */
1699
1700
if(debug){
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
1705
976
exitcode = EXIT_FAILURE;
977
goto end;
978
}
979
if((network.ifr_flags & IFF_UP) == 0){
980
network.ifr_flags |= IFF_UP;
981
ret = ioctl(sd, SIOCSIFFLAGS, &network);
982
if(ret == -1){
983
perror("ioctl SIOCSIFFLAGS");
984
exitcode = EXIT_FAILURE;
985
goto end;
986
}
987
}
988
close(sd);
989
}
990
991
if (not debug){
992
avahi_set_log_function(empty_log);
993
}
994
995
/* Initialize the pseudo-RNG for Avahi */
996
srand((unsigned int) time(NULL));
997
998
/* Allocate main Avahi loop object */
999
mc.simple_poll = avahi_simple_poll_new();
1000
if (mc.simple_poll == NULL) {
1001
fprintf(stderr, "Avahi: Failed to create simple poll"
1002
" object.\n");
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
{
1008
AvahiServerConfig config;
1009
/* Do not publish any local Zeroconf records */
1010
avahi_server_config_init(&config);
1011
config.publish_hinfo = 0;
1012
config.publish_addresses = 0;
1013
config.publish_workstation = 0;
1014
config.publish_domain = 0;
1015
1016
/* Allocate a new server */
1017
mc.server = avahi_server_new(avahi_simple_poll_get
1018
(mc.simple_poll), &config, NULL,
1019
NULL, &error);
1020
1021
/* Free the Avahi configuration data */
1022
avahi_server_config_free(&config);
1023
}
1024
1025
/* Check if creating the Avahi server object succeeded */
1026
if (mc.server == NULL) {
1027
fprintf(stderr, "Failed to create Avahi server: %s\n",
1028
avahi_strerror(error));
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
/* Create the Avahi service browser */
1034
sb = avahi_s_service_browser_new(mc.server, if_index,
1035
AVAHI_PROTO_INET6,
1036
"_mandos._tcp", NULL, 0,
1037
browse_callback, &mc);
1038
if (sb == NULL) {
1039
fprintf(stderr, "Failed to create service browser: %s\n",
1040
avahi_strerror(avahi_server_errno(mc.server)));
1041
exitcode = EXIT_FAILURE;
1042
goto end;
1043
}
1044
1045
/* Run the main loop */
1046
1047
if (debug){
1048
fprintf(stderr, "Starting Avahi loop search\n");
1049
}
1050
1051
avahi_simple_poll_loop(mc.simple_poll);
1052
1706
1053
end:
1707
1708
if(debug){
1709
fprintf(stderr, "%s exiting\n", argv[0]);
1710
}
1711
1712
/* Cleanup things */
1713
if(sb != NULL)
1714
avahi_s_service_browser_free(sb);
1715
1716
if(mc.server != NULL)
1717
avahi_server_free(mc.server);
1718
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
1721
1722
if(gnutls_initialized){
1723
gnutls_certificate_free_credentials(mc.cred);
1724
gnutls_global_deinit();
1725
gnutls_dh_params_deinit(mc.dh_params);
1726
}
1727
1728
if(gpgme_initialized){
1729
gpgme_release(mc.ctx);
1730
}
1731
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
direntry->d_name);
1789
if(ret < 0){
1790
perror("asprintf");
1791
continue;
1792
}
1793
ret = remove(fullname);
1794
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
1797
}
1798
free(fullname);
1799
}
1800
closedir(d);
1801
}
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
1805
}
1806
}
1807
1808
if(quit_now){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1813
NULL));
1814
if(ret == -1){
1815
perror("sigaction");
1816
}
1817
do {
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1820
if(ret != 0){
1821
perror("raise");
1822
abort();
1823
}
1824
TEMP_FAILURE_RETRY(pause());
1825
}
1826
1827
return exitcode;
1054
1055
if (debug){
1056
fprintf(stderr, "%s exiting\n", argv[0]);
1057
}
1058
1059
/* Cleanup things */
1060
if (sb != NULL)
1061
avahi_s_service_browser_free(sb);
1062
1063
if (mc.server != NULL)
1064
avahi_server_free(mc.server);
1065
1066
if (mc.simple_poll != NULL)
1067
avahi_simple_poll_free(mc.simple_poll);
1068
free(pubkeyfile);
1069
free(seckeyfile);
1070
1071
if (gnutls_initalized){
1072
gnutls_certificate_free_credentials (mc.cred);
1073
gnutls_global_deinit ();
1074
}
1075
1076
return exitcode;
1828
1077
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0